7f913246ea
Move custom types to Node merged-on-behalf-of: BBasile <BBasile@users.noreply.github.com>
2043 lines
76 KiB
D
2043 lines
76 KiB
D
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// Copyright Ferdinand Majerech 2011-2014.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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/// YAML scanner.
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/// Code based on PyYAML: http://www.pyyaml.org
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module dyaml.scanner;
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import core.stdc.string;
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import std.algorithm;
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import std.array;
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import std.conv;
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import std.ascii : isAlphaNum, isDigit, isHexDigit;
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import std.exception;
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import std.string;
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import std.typecons;
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import std.traits : Unqual;
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import std.utf;
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import dyaml.escapes;
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import dyaml.exception;
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import dyaml.queue;
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import dyaml.reader;
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import dyaml.style;
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import dyaml.token;
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package:
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/// Scanner produces tokens of the following types:
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/// STREAM-START
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/// STREAM-END
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/// DIRECTIVE(name, value)
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/// DOCUMENT-START
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/// DOCUMENT-END
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/// BLOCK-SEQUENCE-START
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/// BLOCK-MAPPING-START
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/// BLOCK-END
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/// FLOW-SEQUENCE-START
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/// FLOW-MAPPING-START
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/// FLOW-SEQUENCE-END
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/// FLOW-MAPPING-END
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/// BLOCK-ENTRY
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/// FLOW-ENTRY
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/// KEY
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/// VALUE
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/// ALIAS(value)
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/// ANCHOR(value)
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/// TAG(value)
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/// SCALAR(value, plain, style)
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alias isBreak = among!('\0', '\n', '\r', '\u0085', '\u2028', '\u2029');
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alias isBreakOrSpace = among!(' ', '\0', '\n', '\r', '\u0085', '\u2028', '\u2029');
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alias isWhiteSpace = among!(' ', '\t', '\0', '\n', '\r', '\u0085', '\u2028', '\u2029');
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alias isNonScalarStartCharacter = among!('-', '?', ':', ',', '[', ']', '{', '}',
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'#', '&', '*', '!', '|', '>', '\'', '"', '%', '@', '`', ' ', '\t', '\0', '\n',
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'\r', '\u0085', '\u2028', '\u2029');
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alias isURIChar = among!('-', ';', '/', '?', ':', '@', '&', '=', '+', '$', ',',
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'_', '.', '!', '~', '*', '\'', '(', ')', '[', ']', '%');
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alias isNSChar = among!(' ', '\n', '\r', '\u0085', '\u2028', '\u2029');
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alias isBChar = among!('\n', '\r', '\u0085', '\u2028', '\u2029');
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alias isFlowScalarBreakSpace = among!(' ', '\t', '\0', '\n', '\r', '\u0085', '\u2028', '\u2029', '\'', '"', '\\');
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/// Marked exception thrown at scanner errors.
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///
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/// See_Also: MarkedYAMLException
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class ScannerException : MarkedYAMLException
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{
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mixin MarkedExceptionCtors;
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}
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/// Generates tokens from data provided by a Reader.
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final class Scanner
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{
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private:
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/// A simple key is a key that is not denoted by the '?' indicator.
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/// For example:
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/// ---
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/// block simple key: value
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/// ? not a simple key:
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/// : { flow simple key: value }
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/// We emit the KEY token before all keys, so when we find a potential simple
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/// key, we try to locate the corresponding ':' indicator. Simple keys should be
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/// limited to a single line and 1024 characters.
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///
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/// 16 bytes on 64-bit.
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static struct SimpleKey
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{
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/// Character index in reader where the key starts.
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uint charIndex = uint.max;
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/// Index of the key token from start (first token scanned being 0).
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uint tokenIndex;
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/// Line the key starts at.
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uint line;
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/// Column the key starts at.
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ushort column;
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/// Is this required to be a simple key?
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bool required;
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/// Is this struct "null" (invalid)?.
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bool isNull;
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}
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/// Block chomping types.
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enum Chomping
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{
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/// Strip all trailing line breaks. '-' indicator.
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strip,
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/// Line break of the last line is preserved, others discarded. Default.
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clip,
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/// All trailing line breaks are preserved. '+' indicator.
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keep
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}
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/// Reader used to read from a file/stream.
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Reader reader_;
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/// Are we done scanning?
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bool done_;
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/// Level of nesting in flow context. If 0, we're in block context.
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uint flowLevel_;
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/// Current indentation level.
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int indent_ = -1;
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/// Past indentation levels. Used as a stack.
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Appender!(int[]) indents_;
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/// Processed tokens not yet emitted. Used as a queue.
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Queue!Token tokens_;
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/// Number of tokens emitted through the getToken method.
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uint tokensTaken_;
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/// Can a simple key start at the current position? A simple key may start:
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/// - at the beginning of the line, not counting indentation spaces
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/// (in block context),
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/// - after '{', '[', ',' (in the flow context),
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/// - after '?', ':', '-' (in the block context).
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/// In the block context, this flag also signifies if a block collection
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/// may start at the current position.
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bool allowSimpleKey_ = true;
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/// Possible simple keys indexed by flow levels.
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SimpleKey[] possibleSimpleKeys_;
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/// Set on error by nothrow/@nogc inner functions along with errorData_.
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///
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/// Non-nothrow/GC-using caller functions can then throw an exception using
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/// data stored in errorData_.
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bool error_;
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/// Data for the exception to throw if error_ is true.
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MarkedYAMLExceptionData errorData_;
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/// Error messages can be built in this buffer without using the GC.
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///
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/// ScannerException (MarkedYAMLException) copies string data passed to its
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/// constructor so it's safe to use slices of this buffer as parameters for
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/// exceptions that may outlive the Scanner. The GC allocation when creating the
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/// error message is removed, but the allocation when creating an exception is
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/// not.
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char[256] msgBuffer_;
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public:
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/// Construct a Scanner using specified Reader.
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this(Reader reader) @safe nothrow
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{
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// Return the next token, but do not delete it from the queue
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reader_ = reader;
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fetchStreamStart();
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}
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/// Check if the next token is one of specified types.
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///
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/// If no types are specified, checks if any tokens are left.
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///
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/// Params: ids = Token IDs to check for.
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///
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/// Returns: true if the next token is one of specified types, or if there are
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/// any tokens left if no types specified, false otherwise.
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bool checkToken(const TokenID[] ids ...) @safe
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{
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// Check if the next token is one of specified types.
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while(needMoreTokens()) { fetchToken(); }
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if(!tokens_.empty)
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{
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if(ids.length == 0) { return true; }
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else
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{
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const nextId = tokens_.peek().id;
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foreach(id; ids)
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{
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if(nextId == id) { return true; }
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}
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}
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}
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return false;
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}
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/// Return the next token, but keep it in the queue.
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///
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/// Must not be called if there are no tokens left.
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ref const(Token) peekToken() @safe
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{
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while(needMoreTokens) { fetchToken(); }
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if(!tokens_.empty) { return tokens_.peek(); }
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assert(false, "No token left to peek");
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}
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/// Return the next token, removing it from the queue.
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///
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/// Must not be called if there are no tokens left.
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Token getToken() @safe
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{
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while(needMoreTokens){fetchToken();}
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if(!tokens_.empty)
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{
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++tokensTaken_;
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return tokens_.pop();
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}
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assert(false, "No token left to get");
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}
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private:
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/// Build an error message in msgBuffer_ and return it as a string.
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string buildMsg(S ...)(S args)
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{
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try {
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return text(args);
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}
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catch (Exception)
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{
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return "";
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}
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}
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/// Most scanning error messages have the same format; so build them with this
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/// function.
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string expected(T)(string expected, T found)
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{
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return buildMsg("expected ", expected, ", but found ", found);
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}
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/// If error_ is true, throws a ScannerException constructed from errorData_ and
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/// sets error_ to false.
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void throwIfError() @safe pure
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{
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if(!error_) { return; }
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error_ = false;
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throw new ScannerException(errorData_);
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}
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/// Called by internal nothrow/@nogc methods to set an error to be thrown by
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/// their callers.
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///
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/// See_Also: dyaml.exception.MarkedYamlException
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void error(string context, const Mark contextMark, string problem,
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const Mark problemMark) @safe pure nothrow @nogc
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{
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assert(error_ == false,
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"Setting an error when there already is a not yet thrown error");
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error_ = true;
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errorData_ = MarkedYAMLExceptionData(context, contextMark, problem, problemMark);
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}
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/// Determine whether or not we need to fetch more tokens before peeking/getting a token.
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bool needMoreTokens() @safe pure
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{
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if(done_) { return false; }
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if(tokens_.empty) { return true; }
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/// The current token may be a potential simple key, so we need to look further.
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stalePossibleSimpleKeys();
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return nextPossibleSimpleKey() == tokensTaken_;
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}
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/// Fetch at token, adding it to tokens_.
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void fetchToken() @safe
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{
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// Eat whitespaces and comments until we reach the next token.
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scanToNextToken();
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// Remove obsolete possible simple keys.
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stalePossibleSimpleKeys();
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// Compare current indentation and column. It may add some tokens
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// and decrease the current indentation level.
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unwindIndent(reader_.column);
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// Get the next character.
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const dchar c = reader_.peekByte();
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// Fetch the token.
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if(c == '\0') { return fetchStreamEnd(); }
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if(checkDirective()) { return fetchDirective(); }
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if(checkDocumentStart()) { return fetchDocumentStart(); }
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if(checkDocumentEnd()) { return fetchDocumentEnd(); }
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// Order of the following checks is NOT significant.
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switch(c)
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{
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case '[': return fetchFlowSequenceStart();
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case '{': return fetchFlowMappingStart();
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case ']': return fetchFlowSequenceEnd();
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case '}': return fetchFlowMappingEnd();
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case ',': return fetchFlowEntry();
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case '!': return fetchTag();
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case '\'': return fetchSingle();
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case '\"': return fetchDouble();
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case '*': return fetchAlias();
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case '&': return fetchAnchor();
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case '?': if(checkKey()) { return fetchKey(); } goto default;
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case ':': if(checkValue()) { return fetchValue(); } goto default;
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case '-': if(checkBlockEntry()) { return fetchBlockEntry(); } goto default;
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case '|': if(flowLevel_ == 0) { return fetchLiteral(); } break;
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case '>': if(flowLevel_ == 0) { return fetchFolded(); } break;
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default: if(checkPlain()) { return fetchPlain(); }
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}
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throw new ScannerException("While scanning for the next token, found character " ~
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"\'%s\', index %s that cannot start any token"
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.format(c, to!int(c)), reader_.mark);
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}
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/// Return the token number of the nearest possible simple key.
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uint nextPossibleSimpleKey() @safe pure nothrow @nogc
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{
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uint minTokenNumber = uint.max;
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foreach(k, ref simpleKey; possibleSimpleKeys_)
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{
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if(simpleKey.isNull) { continue; }
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minTokenNumber = min(minTokenNumber, simpleKey.tokenIndex);
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}
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return minTokenNumber;
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}
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/// Remove entries that are no longer possible simple keys.
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///
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/// According to the YAML specification, simple keys
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/// - should be limited to a single line,
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/// - should be no longer than 1024 characters.
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/// Disabling this will allow simple keys of any length and
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/// height (may cause problems if indentation is broken though).
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void stalePossibleSimpleKeys() @safe pure
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{
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foreach(level, ref key; possibleSimpleKeys_)
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{
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if(key.isNull) { continue; }
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if(key.line != reader_.line || reader_.charIndex - key.charIndex > 1024)
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{
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enforce(!key.required,
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new ScannerException("While scanning a simple key",
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Mark(key.line, key.column),
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"could not find expected ':'", reader_.mark));
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key.isNull = true;
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}
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}
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}
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/// Check if the next token starts a possible simple key and if so, save its position.
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///
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/// This function is called for ALIAS, ANCHOR, TAG, SCALAR(flow), '[', and '{'.
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void savePossibleSimpleKey() @safe pure
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{
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// Check if a simple key is required at the current position.
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const required = (flowLevel_ == 0 && indent_ == reader_.column);
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assert(allowSimpleKey_ || !required, "A simple key is required only if it is " ~
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"the first token in the current line. Therefore it is always allowed.");
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if(!allowSimpleKey_) { return; }
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// The next token might be a simple key, so save its number and position.
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removePossibleSimpleKey();
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const tokenCount = tokensTaken_ + cast(uint)tokens_.length;
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const line = reader_.line;
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const column = reader_.column;
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const key = SimpleKey(cast(uint)reader_.charIndex, tokenCount, line,
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cast(ushort)min(column, ushort.max), required);
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if(possibleSimpleKeys_.length <= flowLevel_)
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{
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const oldLength = possibleSimpleKeys_.length;
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possibleSimpleKeys_.length = flowLevel_ + 1;
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//No need to initialize the last element, it's already done in the next line.
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possibleSimpleKeys_[oldLength .. flowLevel_] = SimpleKey.init;
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}
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possibleSimpleKeys_[flowLevel_] = key;
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}
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/// Remove the saved possible key position at the current flow level.
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void removePossibleSimpleKey() @safe pure
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{
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if(possibleSimpleKeys_.length <= flowLevel_) { return; }
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if(!possibleSimpleKeys_[flowLevel_].isNull)
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{
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const key = possibleSimpleKeys_[flowLevel_];
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enforce(!key.required,
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new ScannerException("While scanning a simple key",
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Mark(key.line, key.column),
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"could not find expected ':'", reader_.mark));
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possibleSimpleKeys_[flowLevel_].isNull = true;
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}
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}
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/// Decrease indentation, removing entries in indents_.
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///
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/// Params: column = Current column in the file/stream.
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void unwindIndent(const int column) @safe
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{
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if(flowLevel_ > 0)
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{
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// In flow context, tokens should respect indentation.
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// The condition should be `indent >= column` according to the spec.
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// But this condition will prohibit intuitively correct
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// constructions such as
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// key : {
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// }
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// In the flow context, indentation is ignored. We make the scanner less
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// restrictive than what the specification requires.
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// if(pedantic_ && flowLevel_ > 0 && indent_ > column)
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// {
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// throw new ScannerException("Invalid intendation or unclosed '[' or '{'",
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// reader_.mark)
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// }
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return;
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}
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// In block context, we may need to issue the BLOCK-END tokens.
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while(indent_ > column)
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{
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indent_ = indents_.data.back;
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assert(indents_.data.length);
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indents_.shrinkTo(indents_.data.length - 1);
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tokens_.push(blockEndToken(reader_.mark, reader_.mark));
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}
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}
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/// Increase indentation if needed.
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///
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/// Params: column = Current column in the file/stream.
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///
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/// Returns: true if the indentation was increased, false otherwise.
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bool addIndent(int column) @safe
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{
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if(indent_ >= column){return false;}
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indents_ ~= indent_;
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indent_ = column;
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return true;
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}
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/// Add STREAM-START token.
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void fetchStreamStart() @safe nothrow
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{
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tokens_.push(streamStartToken(reader_.mark, reader_.mark, reader_.encoding));
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}
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///Add STREAM-END token.
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void fetchStreamEnd() @safe
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{
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//Set intendation to -1 .
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unwindIndent(-1);
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removePossibleSimpleKey();
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allowSimpleKey_ = false;
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possibleSimpleKeys_.destroy;
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tokens_.push(streamEndToken(reader_.mark, reader_.mark));
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done_ = true;
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}
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/// Add DIRECTIVE token.
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void fetchDirective() @safe
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{
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// Set intendation to -1 .
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unwindIndent(-1);
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// Reset simple keys.
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removePossibleSimpleKey();
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allowSimpleKey_ = false;
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auto directive = scanDirective();
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throwIfError();
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tokens_.push(directive);
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}
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/// Add DOCUMENT-START or DOCUMENT-END token.
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void fetchDocumentIndicator(TokenID id)()
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if(id == TokenID.documentStart || id == TokenID.documentEnd)
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{
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// Set indentation to -1 .
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unwindIndent(-1);
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// Reset simple keys. Note that there can't be a block collection after '---'.
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removePossibleSimpleKey();
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allowSimpleKey_ = false;
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Mark startMark = reader_.mark;
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reader_.forward(3);
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tokens_.push(simpleToken!id(startMark, reader_.mark));
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}
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/// Aliases to add DOCUMENT-START or DOCUMENT-END token.
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alias fetchDocumentStart = fetchDocumentIndicator!(TokenID.documentStart);
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alias fetchDocumentEnd = fetchDocumentIndicator!(TokenID.documentEnd);
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/// Add FLOW-SEQUENCE-START or FLOW-MAPPING-START token.
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void fetchFlowCollectionStart(TokenID id)() @safe
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{
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// '[' and '{' may start a simple key.
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savePossibleSimpleKey();
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// Simple keys are allowed after '[' and '{'.
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allowSimpleKey_ = true;
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++flowLevel_;
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Mark startMark = reader_.mark;
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reader_.forward();
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tokens_.push(simpleToken!id(startMark, reader_.mark));
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}
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/// Aliases to add FLOW-SEQUENCE-START or FLOW-MAPPING-START token.
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alias fetchFlowSequenceStart = fetchFlowCollectionStart!(TokenID.flowSequenceStart);
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alias fetchFlowMappingStart = fetchFlowCollectionStart!(TokenID.flowMappingStart);
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|
|
/// Add FLOW-SEQUENCE-START or FLOW-MAPPING-START token.
|
|
void fetchFlowCollectionEnd(TokenID id)()
|
|
{
|
|
// Reset possible simple key on the current level.
|
|
removePossibleSimpleKey();
|
|
// No simple keys after ']' and '}'.
|
|
allowSimpleKey_ = false;
|
|
--flowLevel_;
|
|
|
|
Mark startMark = reader_.mark;
|
|
reader_.forward();
|
|
tokens_.push(simpleToken!id(startMark, reader_.mark));
|
|
}
|
|
|
|
/// Aliases to add FLOW-SEQUENCE-START or FLOW-MAPPING-START token/
|
|
alias fetchFlowSequenceEnd = fetchFlowCollectionEnd!(TokenID.flowSequenceEnd);
|
|
alias fetchFlowMappingEnd = fetchFlowCollectionEnd!(TokenID.flowMappingEnd);
|
|
|
|
/// Add FLOW-ENTRY token;
|
|
void fetchFlowEntry() @safe
|
|
{
|
|
// Reset possible simple key on the current level.
|
|
removePossibleSimpleKey();
|
|
// Simple keys are allowed after ','.
|
|
allowSimpleKey_ = true;
|
|
|
|
Mark startMark = reader_.mark;
|
|
reader_.forward();
|
|
tokens_.push(flowEntryToken(startMark, reader_.mark));
|
|
}
|
|
|
|
/// Additional checks used in block context in fetchBlockEntry and fetchKey.
|
|
///
|
|
/// Params: type = String representing the token type we might need to add.
|
|
/// id = Token type we might need to add.
|
|
void blockChecks(string type, TokenID id)()
|
|
{
|
|
enum context = type ~ " keys are not allowed here";
|
|
// Are we allowed to start a key (not neccesarily a simple one)?
|
|
enforce(allowSimpleKey_, new ScannerException(context, reader_.mark));
|
|
|
|
if(addIndent(reader_.column))
|
|
{
|
|
tokens_.push(simpleToken!id(reader_.mark, reader_.mark));
|
|
}
|
|
}
|
|
|
|
/// Add BLOCK-ENTRY token. Might add BLOCK-SEQUENCE-START in the process.
|
|
void fetchBlockEntry() @safe
|
|
{
|
|
if(flowLevel_ == 0) { blockChecks!("Sequence", TokenID.blockSequenceStart)(); }
|
|
|
|
// It's an error for the block entry to occur in the flow context,
|
|
// but we let the parser detect this.
|
|
|
|
// Reset possible simple key on the current level.
|
|
removePossibleSimpleKey();
|
|
// Simple keys are allowed after '-'.
|
|
allowSimpleKey_ = true;
|
|
|
|
Mark startMark = reader_.mark;
|
|
reader_.forward();
|
|
tokens_.push(blockEntryToken(startMark, reader_.mark));
|
|
}
|
|
|
|
/// Add KEY token. Might add BLOCK-MAPPING-START in the process.
|
|
void fetchKey() @safe
|
|
{
|
|
if(flowLevel_ == 0) { blockChecks!("Mapping", TokenID.blockMappingStart)(); }
|
|
|
|
// Reset possible simple key on the current level.
|
|
removePossibleSimpleKey();
|
|
// Simple keys are allowed after '?' in the block context.
|
|
allowSimpleKey_ = (flowLevel_ == 0);
|
|
|
|
Mark startMark = reader_.mark;
|
|
reader_.forward();
|
|
tokens_.push(keyToken(startMark, reader_.mark));
|
|
}
|
|
|
|
/// Add VALUE token. Might add KEY and/or BLOCK-MAPPING-START in the process.
|
|
void fetchValue() @safe
|
|
{
|
|
//Do we determine a simple key?
|
|
if(possibleSimpleKeys_.length > flowLevel_ &&
|
|
!possibleSimpleKeys_[flowLevel_].isNull)
|
|
{
|
|
const key = possibleSimpleKeys_[flowLevel_];
|
|
possibleSimpleKeys_[flowLevel_].isNull = true;
|
|
Mark keyMark = Mark(key.line, key.column);
|
|
const idx = key.tokenIndex - tokensTaken_;
|
|
|
|
assert(idx >= 0);
|
|
|
|
// Add KEY.
|
|
// Manually inserting since tokens are immutable (need linked list).
|
|
tokens_.insert(keyToken(keyMark, keyMark), idx);
|
|
|
|
// If this key starts a new block mapping, we need to add BLOCK-MAPPING-START.
|
|
if(flowLevel_ == 0 && addIndent(key.column))
|
|
{
|
|
tokens_.insert(blockMappingStartToken(keyMark, keyMark), idx);
|
|
}
|
|
|
|
// There cannot be two simple keys in a row.
|
|
allowSimpleKey_ = false;
|
|
}
|
|
// Part of a complex key
|
|
else
|
|
{
|
|
// We can start a complex value if and only if we can start a simple key.
|
|
enforce(flowLevel_ > 0 || allowSimpleKey_,
|
|
new ScannerException("Mapping values are not allowed here", reader_.mark));
|
|
|
|
// If this value starts a new block mapping, we need to add
|
|
// BLOCK-MAPPING-START. It'll be detected as an error later by the parser.
|
|
if(flowLevel_ == 0 && addIndent(reader_.column))
|
|
{
|
|
tokens_.push(blockMappingStartToken(reader_.mark, reader_.mark));
|
|
}
|
|
|
|
// Reset possible simple key on the current level.
|
|
removePossibleSimpleKey();
|
|
// Simple keys are allowed after ':' in the block context.
|
|
allowSimpleKey_ = (flowLevel_ == 0);
|
|
}
|
|
|
|
// Add VALUE.
|
|
Mark startMark = reader_.mark;
|
|
reader_.forward();
|
|
tokens_.push(valueToken(startMark, reader_.mark));
|
|
}
|
|
|
|
/// Add ALIAS or ANCHOR token.
|
|
void fetchAnchor_(TokenID id)() @safe
|
|
if(id == TokenID.alias_ || id == TokenID.anchor)
|
|
{
|
|
// ALIAS/ANCHOR could be a simple key.
|
|
savePossibleSimpleKey();
|
|
// No simple keys after ALIAS/ANCHOR.
|
|
allowSimpleKey_ = false;
|
|
|
|
auto anchor = scanAnchor(id);
|
|
throwIfError();
|
|
tokens_.push(anchor);
|
|
}
|
|
|
|
/// Aliases to add ALIAS or ANCHOR token.
|
|
alias fetchAlias = fetchAnchor_!(TokenID.alias_);
|
|
alias fetchAnchor = fetchAnchor_!(TokenID.anchor);
|
|
|
|
/// Add TAG token.
|
|
void fetchTag() @safe
|
|
{
|
|
//TAG could start a simple key.
|
|
savePossibleSimpleKey();
|
|
//No simple keys after TAG.
|
|
allowSimpleKey_ = false;
|
|
|
|
tokens_.push(scanTag());
|
|
throwIfError();
|
|
}
|
|
|
|
/// Add block SCALAR token.
|
|
void fetchBlockScalar(ScalarStyle style)() @safe
|
|
if(style == ScalarStyle.literal || style == ScalarStyle.folded)
|
|
{
|
|
// Reset possible simple key on the current level.
|
|
removePossibleSimpleKey();
|
|
// A simple key may follow a block scalar.
|
|
allowSimpleKey_ = true;
|
|
|
|
auto blockScalar = scanBlockScalar(style);
|
|
throwIfError();
|
|
tokens_.push(blockScalar);
|
|
}
|
|
|
|
/// Aliases to add literal or folded block scalar.
|
|
alias fetchLiteral = fetchBlockScalar!(ScalarStyle.literal);
|
|
alias fetchFolded = fetchBlockScalar!(ScalarStyle.folded);
|
|
|
|
/// Add quoted flow SCALAR token.
|
|
void fetchFlowScalar(ScalarStyle quotes)()
|
|
{
|
|
// A flow scalar could be a simple key.
|
|
savePossibleSimpleKey();
|
|
// No simple keys after flow scalars.
|
|
allowSimpleKey_ = false;
|
|
|
|
// Scan and add SCALAR.
|
|
auto scalar = scanFlowScalar(quotes);
|
|
throwIfError();
|
|
tokens_.push(scalar);
|
|
}
|
|
|
|
/// Aliases to add single or double quoted block scalar.
|
|
alias fetchSingle = fetchFlowScalar!(ScalarStyle.singleQuoted);
|
|
alias fetchDouble = fetchFlowScalar!(ScalarStyle.doubleQuoted);
|
|
|
|
/// Add plain SCALAR token.
|
|
void fetchPlain() @safe
|
|
{
|
|
// A plain scalar could be a simple key
|
|
savePossibleSimpleKey();
|
|
// No simple keys after plain scalars. But note that scanPlain() will
|
|
// change this flag if the scan is finished at the beginning of the line.
|
|
allowSimpleKey_ = false;
|
|
auto plain = scanPlain();
|
|
throwIfError();
|
|
|
|
// Scan and add SCALAR. May change allowSimpleKey_
|
|
tokens_.push(plain);
|
|
}
|
|
|
|
pure:
|
|
|
|
///Check if the next token is DIRECTIVE: ^ '%' ...
|
|
bool checkDirective() @safe
|
|
{
|
|
return reader_.peekByte() == '%' && reader_.column == 0;
|
|
}
|
|
|
|
/// Check if the next token is DOCUMENT-START: ^ '---' (' '|'\n')
|
|
bool checkDocumentStart() @safe
|
|
{
|
|
// Check one char first, then all 3, to prevent reading outside the buffer.
|
|
return reader_.column == 0 &&
|
|
reader_.peekByte() == '-' &&
|
|
reader_.prefix(3) == "---" &&
|
|
reader_.peek(3).isWhiteSpace;
|
|
}
|
|
|
|
/// Check if the next token is DOCUMENT-END: ^ '...' (' '|'\n')
|
|
bool checkDocumentEnd() @safe
|
|
{
|
|
// Check one char first, then all 3, to prevent reading outside the buffer.
|
|
return reader_.column == 0 &&
|
|
reader_.peekByte() == '.' &&
|
|
reader_.prefix(3) == "..." &&
|
|
reader_.peek(3).isWhiteSpace;
|
|
}
|
|
|
|
/// Check if the next token is BLOCK-ENTRY: '-' (' '|'\n')
|
|
bool checkBlockEntry() @safe
|
|
{
|
|
return !!reader_.peek(1).isWhiteSpace;
|
|
}
|
|
|
|
/// Check if the next token is KEY(flow context): '?'
|
|
///
|
|
/// or KEY(block context): '?' (' '|'\n')
|
|
bool checkKey() @safe
|
|
{
|
|
return (flowLevel_ > 0 || reader_.peek(1).isWhiteSpace);
|
|
}
|
|
|
|
/// Check if the next token is VALUE(flow context): ':'
|
|
///
|
|
/// or VALUE(block context): ':' (' '|'\n')
|
|
bool checkValue() @safe
|
|
{
|
|
return flowLevel_ > 0 || reader_.peek(1).isWhiteSpace;
|
|
}
|
|
|
|
/// Check if the next token is a plain scalar.
|
|
///
|
|
/// A plain scalar may start with any non-space character except:
|
|
/// '-', '?', ':', ',', '[', ']', '{', '}',
|
|
/// '#', '&', '*', '!', '|', '>', '\'', '\"',
|
|
/// '%', '@', '`'.
|
|
///
|
|
/// It may also start with
|
|
/// '-', '?', ':'
|
|
/// if it is followed by a non-space character.
|
|
///
|
|
/// Note that we limit the last rule to the block context (except the
|
|
/// '-' character) because we want the flow context to be space
|
|
/// independent.
|
|
bool checkPlain() @safe
|
|
{
|
|
const c = reader_.peek();
|
|
if(!c.isNonScalarStartCharacter)
|
|
{
|
|
return true;
|
|
}
|
|
return !reader_.peek(1).isWhiteSpace &&
|
|
(c == '-' || (flowLevel_ == 0 && (c == '?' || c == ':')));
|
|
}
|
|
|
|
/// Move to the next non-space character.
|
|
void findNextNonSpace() @safe
|
|
{
|
|
while(reader_.peekByte() == ' ') { reader_.forward(); }
|
|
}
|
|
|
|
/// Scan a string of alphanumeric or "-_" characters.
|
|
///
|
|
/// Assumes that the caller is building a slice in Reader, and puts the scanned
|
|
/// characters into that slice.
|
|
///
|
|
/// In case of an error, error_ is set. Use throwIfError() to handle this.
|
|
void scanAlphaNumericToSlice(string name)(const Mark startMark)
|
|
{
|
|
size_t length;
|
|
dchar c = reader_.peek();
|
|
while(c.isAlphaNum || "-_"d.canFind(c)) { c = reader_.peek(++length); }
|
|
|
|
if(length == 0)
|
|
{
|
|
enum contextMsg = "While scanning " ~ name;
|
|
error(contextMsg, startMark, expected("alphanumeric, '-' or '_'", c),
|
|
reader_.mark);
|
|
return;
|
|
}
|
|
|
|
reader_.sliceBuilder.write(reader_.get(length));
|
|
}
|
|
|
|
/// Scan and throw away all characters until next line break.
|
|
void scanToNextBreak() @safe
|
|
{
|
|
while(!reader_.peek().isBreak) { reader_.forward(); }
|
|
}
|
|
|
|
/// Scan all characters until next line break.
|
|
///
|
|
/// Assumes that the caller is building a slice in Reader, and puts the scanned
|
|
/// characters into that slice.
|
|
void scanToNextBreakToSlice() @safe
|
|
{
|
|
uint length;
|
|
while(!reader_.peek(length).isBreak)
|
|
{
|
|
++length;
|
|
}
|
|
reader_.sliceBuilder.write(reader_.get(length));
|
|
}
|
|
|
|
|
|
/// Move to next token in the file/stream.
|
|
///
|
|
/// We ignore spaces, line breaks and comments.
|
|
/// If we find a line break in the block context, we set
|
|
/// allowSimpleKey` on.
|
|
///
|
|
/// We do not yet support BOM inside the stream as the
|
|
/// specification requires. Any such mark will be considered as a part
|
|
/// of the document.
|
|
void scanToNextToken() @safe
|
|
{
|
|
// TODO(PyYAML): We need to make tab handling rules more sane. A good rule is:
|
|
// Tabs cannot precede tokens
|
|
// BLOCK-SEQUENCE-START, BLOCK-MAPPING-START, BLOCK-END,
|
|
// KEY(block), VALUE(block), BLOCK-ENTRY
|
|
// So the checking code is
|
|
// if <TAB>:
|
|
// allowSimpleKey_ = false
|
|
// We also need to add the check for `allowSimpleKey_ == true` to
|
|
// `unwindIndent` before issuing BLOCK-END.
|
|
// Scanners for block, flow, and plain scalars need to be modified.
|
|
|
|
for(;;)
|
|
{
|
|
findNextNonSpace();
|
|
|
|
if(reader_.peekByte() == '#') { scanToNextBreak(); }
|
|
if(scanLineBreak() != '\0')
|
|
{
|
|
if(flowLevel_ == 0) { allowSimpleKey_ = true; }
|
|
}
|
|
else
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Scan directive token.
|
|
Token scanDirective() @safe
|
|
{
|
|
Mark startMark = reader_.mark;
|
|
// Skip the '%'.
|
|
reader_.forward();
|
|
|
|
// Scan directive name
|
|
reader_.sliceBuilder.begin();
|
|
scanDirectiveNameToSlice(startMark);
|
|
if(error_) { return Token.init; }
|
|
const name = reader_.sliceBuilder.finish();
|
|
|
|
reader_.sliceBuilder.begin();
|
|
|
|
// Index where tag handle ends and suffix starts in a tag directive value.
|
|
uint tagHandleEnd = uint.max;
|
|
if(name == "YAML") { scanYAMLDirectiveValueToSlice(startMark); }
|
|
else if(name == "TAG") { tagHandleEnd = scanTagDirectiveValueToSlice(startMark); }
|
|
if(error_) { return Token.init; }
|
|
char[] value = reader_.sliceBuilder.finish();
|
|
|
|
Mark endMark = reader_.mark;
|
|
|
|
DirectiveType directive;
|
|
if(name == "YAML") { directive = DirectiveType.yaml; }
|
|
else if(name == "TAG") { directive = DirectiveType.tag; }
|
|
else
|
|
{
|
|
directive = DirectiveType.reserved;
|
|
scanToNextBreak();
|
|
}
|
|
|
|
scanDirectiveIgnoredLine(startMark);
|
|
if(error_) { return Token.init; }
|
|
|
|
return directiveToken(startMark, endMark, value, directive, tagHandleEnd);
|
|
}
|
|
|
|
/// Scan name of a directive token.
|
|
///
|
|
/// Assumes that the caller is building a slice in Reader, and puts the scanned
|
|
/// characters into that slice.
|
|
///
|
|
/// In case of an error, error_ is set. Use throwIfError() to handle this.
|
|
void scanDirectiveNameToSlice(const Mark startMark) @safe
|
|
{
|
|
// Scan directive name.
|
|
scanAlphaNumericToSlice!"a directive"(startMark);
|
|
if(error_) { return; }
|
|
|
|
if(" \0\n\r\u0085\u2028\u2029"d.canFind(reader_.peek())) { return; }
|
|
error("While scanning a directive", startMark,
|
|
expected("alphanumeric, '-' or '_'", reader_.peek()), reader_.mark);
|
|
}
|
|
|
|
/// Scan value of a YAML directive token. Returns major, minor version separated by '.'.
|
|
///
|
|
/// Assumes that the caller is building a slice in Reader, and puts the scanned
|
|
/// characters into that slice.
|
|
///
|
|
/// In case of an error, error_ is set. Use throwIfError() to handle this.
|
|
void scanYAMLDirectiveValueToSlice(const Mark startMark) @safe
|
|
{
|
|
findNextNonSpace();
|
|
|
|
scanYAMLDirectiveNumberToSlice(startMark);
|
|
if(error_) { return; }
|
|
|
|
if(reader_.peekByte() != '.')
|
|
{
|
|
error("While scanning a directive", startMark,
|
|
expected("digit or '.'", reader_.peek()), reader_.mark);
|
|
return;
|
|
}
|
|
// Skip the '.'.
|
|
reader_.forward();
|
|
|
|
reader_.sliceBuilder.write('.');
|
|
scanYAMLDirectiveNumberToSlice(startMark);
|
|
if(error_) { return; }
|
|
|
|
if(!" \0\n\r\u0085\u2028\u2029"d.canFind(reader_.peek()))
|
|
{
|
|
error("While scanning a directive", startMark,
|
|
expected("digit or '.'", reader_.peek()), reader_.mark);
|
|
}
|
|
}
|
|
|
|
/// Scan a number from a YAML directive.
|
|
///
|
|
/// Assumes that the caller is building a slice in Reader, and puts the scanned
|
|
/// characters into that slice.
|
|
///
|
|
/// In case of an error, error_ is set. Use throwIfError() to handle this.
|
|
void scanYAMLDirectiveNumberToSlice(const Mark startMark) @safe
|
|
{
|
|
if(!isDigit(reader_.peek()))
|
|
{
|
|
error("While scanning a directive", startMark,
|
|
expected("digit", reader_.peek()), reader_.mark);
|
|
return;
|
|
}
|
|
|
|
// Already found the first digit in the enforce(), so set length to 1.
|
|
uint length = 1;
|
|
while(reader_.peek(length).isDigit) { ++length; }
|
|
|
|
reader_.sliceBuilder.write(reader_.get(length));
|
|
}
|
|
|
|
/// Scan value of a tag directive.
|
|
///
|
|
/// Assumes that the caller is building a slice in Reader, and puts the scanned
|
|
/// characters into that slice.
|
|
///
|
|
/// Returns: Length of tag handle (which is before tag prefix) in scanned data
|
|
///
|
|
/// In case of an error, error_ is set. Use throwIfError() to handle this.
|
|
uint scanTagDirectiveValueToSlice(const Mark startMark) @safe
|
|
{
|
|
findNextNonSpace();
|
|
const startLength = reader_.sliceBuilder.length;
|
|
scanTagDirectiveHandleToSlice(startMark);
|
|
if(error_) { return uint.max; }
|
|
const handleLength = cast(uint)(reader_.sliceBuilder.length - startLength);
|
|
findNextNonSpace();
|
|
scanTagDirectivePrefixToSlice(startMark);
|
|
|
|
return handleLength;
|
|
}
|
|
|
|
/// Scan handle of a tag directive.
|
|
///
|
|
/// Assumes that the caller is building a slice in Reader, and puts the scanned
|
|
/// characters into that slice.
|
|
///
|
|
/// In case of an error, error_ is set. Use throwIfError() to handle this.
|
|
void scanTagDirectiveHandleToSlice(const Mark startMark) @safe
|
|
{
|
|
scanTagHandleToSlice!"directive"(startMark);
|
|
if(error_) { return; }
|
|
if(reader_.peekByte() == ' ') { return; }
|
|
error("While scanning a directive handle", startMark,
|
|
expected("' '", reader_.peek()), reader_.mark);
|
|
}
|
|
|
|
/// Scan prefix of a tag directive.
|
|
///
|
|
/// Assumes that the caller is building a slice in Reader, and puts the scanned
|
|
/// characters into that slice.
|
|
///
|
|
/// In case of an error, error_ is set. Use throwIfError() to handle this.
|
|
void scanTagDirectivePrefixToSlice(const Mark startMark) @safe
|
|
{
|
|
scanTagURIToSlice!"directive"(startMark);
|
|
if(" \0\n\r\u0085\u2028\u2029"d.canFind(reader_.peek())) { return; }
|
|
error("While scanning a directive prefix", startMark,
|
|
expected("' '", reader_.peek()), reader_.mark);
|
|
}
|
|
|
|
/// Scan (and ignore) ignored line after a directive.
|
|
///
|
|
/// In case of an error, error_ is set. Use throwIfError() to handle this.
|
|
void scanDirectiveIgnoredLine(const Mark startMark) @safe
|
|
{
|
|
findNextNonSpace();
|
|
if(reader_.peekByte() == '#') { scanToNextBreak(); }
|
|
if(reader_.peek().isBreak)
|
|
{
|
|
scanLineBreak();
|
|
return;
|
|
}
|
|
error("While scanning a directive", startMark,
|
|
expected("comment or a line break", reader_.peek()), reader_.mark);
|
|
}
|
|
|
|
|
|
/// Scan an alias or an anchor.
|
|
///
|
|
/// The specification does not restrict characters for anchors and
|
|
/// aliases. This may lead to problems, for instance, the document:
|
|
/// [ *alias, value ]
|
|
/// can be interpteted in two ways, as
|
|
/// [ "value" ]
|
|
/// and
|
|
/// [ *alias , "value" ]
|
|
/// Therefore we restrict aliases to ASCII alphanumeric characters.
|
|
///
|
|
/// In case of an error, error_ is set. Use throwIfError() to handle this.
|
|
Token scanAnchor(const TokenID id) @safe
|
|
{
|
|
const startMark = reader_.mark;
|
|
const dchar i = reader_.get();
|
|
|
|
reader_.sliceBuilder.begin();
|
|
if(i == '*') { scanAlphaNumericToSlice!"an alias"(startMark); }
|
|
else { scanAlphaNumericToSlice!"an anchor"(startMark); }
|
|
// On error, value is discarded as we return immediately
|
|
char[] value = reader_.sliceBuilder.finish();
|
|
if(error_) { return Token.init; }
|
|
|
|
if(!reader_.peek().isWhiteSpace &&
|
|
!"?:,]}%@"d.canFind(reader_.peekByte()))
|
|
{
|
|
enum anchorCtx = "While scanning an anchor";
|
|
enum aliasCtx = "While scanning an alias";
|
|
error(i == '*' ? aliasCtx : anchorCtx, startMark,
|
|
expected("alphanumeric, '-' or '_'", reader_.peek()), reader_.mark);
|
|
return Token.init;
|
|
}
|
|
|
|
if(id == TokenID.alias_)
|
|
{
|
|
return aliasToken(startMark, reader_.mark, value);
|
|
}
|
|
if(id == TokenID.anchor)
|
|
{
|
|
return anchorToken(startMark, reader_.mark, value);
|
|
}
|
|
assert(false, "This code should never be reached");
|
|
}
|
|
|
|
/// Scan a tag token.
|
|
///
|
|
/// In case of an error, error_ is set. Use throwIfError() to handle this.
|
|
Token scanTag() @safe
|
|
{
|
|
const startMark = reader_.mark;
|
|
dchar c = reader_.peek(1);
|
|
|
|
reader_.sliceBuilder.begin();
|
|
scope(failure) { reader_.sliceBuilder.finish(); }
|
|
// Index where tag handle ends and tag suffix starts in the tag value
|
|
// (slice) we will produce.
|
|
uint handleEnd;
|
|
|
|
if(c == '<')
|
|
{
|
|
reader_.forward(2);
|
|
|
|
handleEnd = 0;
|
|
scanTagURIToSlice!"tag"(startMark);
|
|
if(error_) { return Token.init; }
|
|
if(reader_.peekByte() != '>')
|
|
{
|
|
error("While scanning a tag", startMark,
|
|
expected("'>'", reader_.peek()), reader_.mark);
|
|
return Token.init;
|
|
}
|
|
reader_.forward();
|
|
}
|
|
else if(c.isWhiteSpace)
|
|
{
|
|
reader_.forward();
|
|
handleEnd = 0;
|
|
reader_.sliceBuilder.write('!');
|
|
}
|
|
else
|
|
{
|
|
uint length = 1;
|
|
bool useHandle;
|
|
|
|
while(!c.isBreakOrSpace)
|
|
{
|
|
if(c == '!')
|
|
{
|
|
useHandle = true;
|
|
break;
|
|
}
|
|
++length;
|
|
c = reader_.peek(length);
|
|
}
|
|
|
|
if(useHandle)
|
|
{
|
|
scanTagHandleToSlice!"tag"(startMark);
|
|
handleEnd = cast(uint)reader_.sliceBuilder.length;
|
|
if(error_) { return Token.init; }
|
|
}
|
|
else
|
|
{
|
|
reader_.forward();
|
|
reader_.sliceBuilder.write('!');
|
|
handleEnd = cast(uint)reader_.sliceBuilder.length;
|
|
}
|
|
|
|
scanTagURIToSlice!"tag"(startMark);
|
|
if(error_) { return Token.init; }
|
|
}
|
|
|
|
if(reader_.peek().isBreakOrSpace)
|
|
{
|
|
char[] slice = reader_.sliceBuilder.finish();
|
|
return tagToken(startMark, reader_.mark, slice, handleEnd);
|
|
}
|
|
|
|
error("While scanning a tag", startMark, expected("' '", reader_.peek()),
|
|
reader_.mark);
|
|
return Token.init;
|
|
}
|
|
|
|
/// Scan a block scalar token with specified style.
|
|
///
|
|
/// In case of an error, error_ is set. Use throwIfError() to handle this.
|
|
Token scanBlockScalar(const ScalarStyle style) @safe
|
|
{
|
|
const startMark = reader_.mark;
|
|
|
|
// Scan the header.
|
|
reader_.forward();
|
|
|
|
const indicators = scanBlockScalarIndicators(startMark);
|
|
if(error_) { return Token.init; }
|
|
|
|
const chomping = indicators[0];
|
|
const increment = indicators[1];
|
|
scanBlockScalarIgnoredLine(startMark);
|
|
if(error_) { return Token.init; }
|
|
|
|
// Determine the indentation level and go to the first non-empty line.
|
|
Mark endMark;
|
|
uint indent = max(1, indent_ + 1);
|
|
|
|
reader_.sliceBuilder.begin();
|
|
alias Transaction = SliceBuilder.Transaction;
|
|
// Used to strip the last line breaks written to the slice at the end of the
|
|
// scalar, which may be needed based on chomping.
|
|
Transaction breaksTransaction = Transaction(&reader_.sliceBuilder);
|
|
// Read the first indentation/line breaks before the scalar.
|
|
size_t startLen = reader_.sliceBuilder.length;
|
|
if(increment == int.min)
|
|
{
|
|
auto indentation = scanBlockScalarIndentationToSlice();
|
|
endMark = indentation[1];
|
|
indent = max(indent, indentation[0]);
|
|
}
|
|
else
|
|
{
|
|
indent += increment - 1;
|
|
endMark = scanBlockScalarBreaksToSlice(indent);
|
|
}
|
|
|
|
// int.max means there's no line break (int.max is outside UTF-32).
|
|
dchar lineBreak = cast(dchar)int.max;
|
|
|
|
// Scan the inner part of the block scalar.
|
|
while(reader_.column == indent && reader_.peekByte() != '\0')
|
|
{
|
|
breaksTransaction.commit();
|
|
const bool leadingNonSpace = !" \t"d.canFind(reader_.peekByte());
|
|
// This is where the 'interesting' non-whitespace data gets read.
|
|
scanToNextBreakToSlice();
|
|
lineBreak = scanLineBreak();
|
|
|
|
|
|
// This transaction serves to rollback data read in the
|
|
// scanBlockScalarBreaksToSlice() call.
|
|
breaksTransaction = Transaction(&reader_.sliceBuilder);
|
|
startLen = reader_.sliceBuilder.length;
|
|
// The line breaks should actually be written _after_ the if() block
|
|
// below. We work around that by inserting
|
|
endMark = scanBlockScalarBreaksToSlice(indent);
|
|
|
|
// This will not run during the last iteration (see the if() vs the
|
|
// while()), hence breaksTransaction rollback (which happens after this
|
|
// loop) will never roll back data written in this if() block.
|
|
if(reader_.column == indent && reader_.peekByte() != '\0')
|
|
{
|
|
// Unfortunately, folding rules are ambiguous.
|
|
|
|
// This is the folding according to the specification:
|
|
if(style == ScalarStyle.folded && lineBreak == '\n' &&
|
|
leadingNonSpace && !" \t"d.canFind(reader_.peekByte()))
|
|
{
|
|
// No breaks were scanned; no need to insert the space in the
|
|
// middle of slice.
|
|
if(startLen == reader_.sliceBuilder.length)
|
|
{
|
|
reader_.sliceBuilder.write(' ');
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// We need to insert in the middle of the slice in case any line
|
|
// breaks were scanned.
|
|
reader_.sliceBuilder.insert(lineBreak, startLen);
|
|
}
|
|
|
|
////this is Clark Evans's interpretation (also in the spec
|
|
////examples):
|
|
//
|
|
//if(style == ScalarStyle.folded && lineBreak == '\n')
|
|
//{
|
|
// if(startLen == endLen)
|
|
// {
|
|
// if(!" \t"d.canFind(reader_.peekByte()))
|
|
// {
|
|
// reader_.sliceBuilder.write(' ');
|
|
// }
|
|
// else
|
|
// {
|
|
// chunks ~= lineBreak;
|
|
// }
|
|
// }
|
|
//}
|
|
//else
|
|
//{
|
|
// reader_.sliceBuilder.insertBack(lineBreak, endLen - startLen);
|
|
//}
|
|
}
|
|
else
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
|
|
// If chompint is Keep, we keep (commit) the last scanned line breaks
|
|
// (which are at the end of the scalar). Otherwise re remove them (end the
|
|
// transaction).
|
|
if(chomping == Chomping.keep) { breaksTransaction.commit(); }
|
|
else { breaksTransaction.end(); }
|
|
if(chomping != Chomping.strip && lineBreak != int.max)
|
|
{
|
|
// If chomping is Keep, we keep the line break but the first line break
|
|
// that isn't stripped (since chomping isn't Strip in this branch) must
|
|
// be inserted _before_ the other line breaks.
|
|
if(chomping == Chomping.keep)
|
|
{
|
|
reader_.sliceBuilder.insert(lineBreak, startLen);
|
|
}
|
|
// If chomping is not Keep, breaksTransaction was cancelled so we can
|
|
// directly write the first line break (as it isn't stripped - chomping
|
|
// is not Strip)
|
|
else
|
|
{
|
|
reader_.sliceBuilder.write(lineBreak);
|
|
}
|
|
}
|
|
|
|
char[] slice = reader_.sliceBuilder.finish();
|
|
return scalarToken(startMark, endMark, slice, style);
|
|
}
|
|
|
|
/// Scan chomping and indentation indicators of a scalar token.
|
|
///
|
|
/// In case of an error, error_ is set. Use throwIfError() to handle this.
|
|
Tuple!(Chomping, int) scanBlockScalarIndicators(const Mark startMark) @safe
|
|
{
|
|
auto chomping = Chomping.clip;
|
|
int increment = int.min;
|
|
dchar c = reader_.peek();
|
|
|
|
/// Indicators can be in any order.
|
|
if(getChomping(c, chomping))
|
|
{
|
|
getIncrement(c, increment, startMark);
|
|
if(error_) { return tuple(Chomping.init, int.max); }
|
|
}
|
|
else
|
|
{
|
|
const gotIncrement = getIncrement(c, increment, startMark);
|
|
if(error_) { return tuple(Chomping.init, int.max); }
|
|
if(gotIncrement) { getChomping(c, chomping); }
|
|
}
|
|
|
|
if(" \0\n\r\u0085\u2028\u2029"d.canFind(c))
|
|
{
|
|
return tuple(chomping, increment);
|
|
}
|
|
error("While scanning a block scalar", startMark,
|
|
expected("chomping or indentation indicator", c), reader_.mark);
|
|
return tuple(Chomping.init, int.max);
|
|
}
|
|
|
|
/// Get chomping indicator, if detected. Return false otherwise.
|
|
///
|
|
/// Used in scanBlockScalarIndicators.
|
|
///
|
|
/// Params:
|
|
///
|
|
/// c = The character that may be a chomping indicator.
|
|
/// chomping = Write the chomping value here, if detected.
|
|
bool getChomping(ref dchar c, ref Chomping chomping) @safe
|
|
{
|
|
if(!"+-"d.canFind(c)) { return false; }
|
|
chomping = c == '+' ? Chomping.keep : Chomping.strip;
|
|
reader_.forward();
|
|
c = reader_.peek();
|
|
return true;
|
|
}
|
|
|
|
/// Get increment indicator, if detected. Return false otherwise.
|
|
///
|
|
/// Used in scanBlockScalarIndicators.
|
|
///
|
|
/// Params:
|
|
///
|
|
/// c = The character that may be an increment indicator.
|
|
/// If an increment indicator is detected, this will be updated to
|
|
/// the next character in the Reader.
|
|
/// increment = Write the increment value here, if detected.
|
|
/// startMark = Mark for error messages.
|
|
///
|
|
/// In case of an error, error_ is set. Use throwIfError() to handle this.
|
|
bool getIncrement(ref dchar c, ref int increment, const Mark startMark) @safe
|
|
{
|
|
if(!c.isDigit) { return false; }
|
|
// Convert a digit to integer.
|
|
increment = c - '0';
|
|
assert(increment < 10 && increment >= 0, "Digit has invalid value");
|
|
if(increment > 0)
|
|
{
|
|
reader_.forward();
|
|
c = reader_.peek();
|
|
return true;
|
|
}
|
|
error("While scanning a block scalar", startMark,
|
|
expected("indentation indicator in range 1-9", "0"), reader_.mark);
|
|
return false;
|
|
}
|
|
|
|
/// Scan (and ignore) ignored line in a block scalar.
|
|
///
|
|
/// In case of an error, error_ is set. Use throwIfError() to handle this.
|
|
void scanBlockScalarIgnoredLine(const Mark startMark) @safe
|
|
{
|
|
findNextNonSpace();
|
|
if(reader_.peekByte()== '#') { scanToNextBreak(); }
|
|
|
|
if(reader_.peek().isBreak)
|
|
{
|
|
scanLineBreak();
|
|
return;
|
|
}
|
|
error("While scanning a block scalar", startMark,
|
|
expected("comment or line break", reader_.peek()), reader_.mark);
|
|
}
|
|
|
|
/// Scan indentation in a block scalar, returning line breaks, max indent and end mark.
|
|
///
|
|
/// Assumes that the caller is building a slice in Reader, and puts the scanned
|
|
/// characters into that slice.
|
|
Tuple!(uint, Mark) scanBlockScalarIndentationToSlice() @safe
|
|
{
|
|
uint maxIndent;
|
|
Mark endMark = reader_.mark;
|
|
|
|
while(" \n\r\u0085\u2028\u2029"d.canFind(reader_.peek()))
|
|
{
|
|
if(reader_.peekByte() != ' ')
|
|
{
|
|
reader_.sliceBuilder.write(scanLineBreak());
|
|
endMark = reader_.mark;
|
|
continue;
|
|
}
|
|
reader_.forward();
|
|
maxIndent = max(reader_.column, maxIndent);
|
|
}
|
|
|
|
return tuple(maxIndent, endMark);
|
|
}
|
|
|
|
/// Scan line breaks at lower or specified indentation in a block scalar.
|
|
///
|
|
/// Assumes that the caller is building a slice in Reader, and puts the scanned
|
|
/// characters into that slice.
|
|
Mark scanBlockScalarBreaksToSlice(const uint indent) @safe
|
|
{
|
|
Mark endMark = reader_.mark;
|
|
|
|
for(;;)
|
|
{
|
|
while(reader_.column < indent && reader_.peekByte() == ' ') { reader_.forward(); }
|
|
if(!"\n\r\u0085\u2028\u2029"d.canFind(reader_.peek())) { break; }
|
|
reader_.sliceBuilder.write(scanLineBreak());
|
|
endMark = reader_.mark;
|
|
}
|
|
|
|
return endMark;
|
|
}
|
|
|
|
/// Scan a qouted flow scalar token with specified quotes.
|
|
///
|
|
/// In case of an error, error_ is set. Use throwIfError() to handle this.
|
|
Token scanFlowScalar(const ScalarStyle quotes) @safe
|
|
{
|
|
const startMark = reader_.mark;
|
|
const quote = reader_.get();
|
|
|
|
reader_.sliceBuilder.begin();
|
|
scope(exit) if(error_) { reader_.sliceBuilder.finish(); }
|
|
|
|
scanFlowScalarNonSpacesToSlice(quotes, startMark);
|
|
if(error_) { return Token.init; }
|
|
|
|
while(reader_.peek() != quote)
|
|
{
|
|
scanFlowScalarSpacesToSlice(startMark);
|
|
if(error_) { return Token.init; }
|
|
scanFlowScalarNonSpacesToSlice(quotes, startMark);
|
|
if(error_) { return Token.init; }
|
|
}
|
|
reader_.forward();
|
|
|
|
auto slice = reader_.sliceBuilder.finish();
|
|
return scalarToken(startMark, reader_.mark, slice, quotes);
|
|
}
|
|
|
|
/// Scan nonspace characters in a flow scalar.
|
|
///
|
|
/// Assumes that the caller is building a slice in Reader, and puts the scanned
|
|
/// characters into that slice.
|
|
///
|
|
/// In case of an error, error_ is set. Use throwIfError() to handle this.
|
|
void scanFlowScalarNonSpacesToSlice(const ScalarStyle quotes, const Mark startMark)
|
|
@safe
|
|
{
|
|
for(;;)
|
|
{
|
|
dchar c = reader_.peek();
|
|
|
|
size_t numCodePoints;
|
|
// This is an optimized way of writing:
|
|
// while(!search.canFind(reader_.peek(numCodePoints))) { ++numCodePoints; }
|
|
outer: for(size_t oldSliceLength;;)
|
|
{
|
|
// This will not necessarily make slice 32 chars longer, as not all
|
|
// code points are 1 char.
|
|
const char[] slice = reader_.slice(numCodePoints + 32);
|
|
if(slice.length == oldSliceLength)
|
|
{
|
|
error("While reading a flow scalar", startMark,
|
|
"reached end of file", reader_.mark);
|
|
return;
|
|
}
|
|
for(size_t i = oldSliceLength; i < slice.length;)
|
|
{
|
|
// slice is UTF-8 - need to decode
|
|
const ch = slice[i] < 0x80 ? slice[i++] : decode(slice, i);
|
|
if(ch.isFlowScalarBreakSpace) { break outer; }
|
|
++numCodePoints;
|
|
}
|
|
oldSliceLength = slice.length;
|
|
}
|
|
|
|
reader_.sliceBuilder.write(reader_.get(numCodePoints));
|
|
|
|
c = reader_.peek();
|
|
if(quotes == ScalarStyle.singleQuoted && c == '\'' && reader_.peek(1) == '\'')
|
|
{
|
|
reader_.forward(2);
|
|
reader_.sliceBuilder.write('\'');
|
|
}
|
|
else if((quotes == ScalarStyle.doubleQuoted && c == '\'') ||
|
|
(quotes == ScalarStyle.singleQuoted && "\"\\"d.canFind(c)))
|
|
{
|
|
reader_.forward();
|
|
reader_.sliceBuilder.write(c);
|
|
}
|
|
else if(quotes == ScalarStyle.doubleQuoted && c == '\\')
|
|
{
|
|
reader_.forward();
|
|
c = reader_.peek();
|
|
if(dyaml.escapes.escapes.canFind(c))
|
|
{
|
|
reader_.forward();
|
|
// Escaping has been moved to Parser as it can't be done in
|
|
// place (in a slice) in case of '\P' and '\L' (very uncommon,
|
|
// but we don't want to break the spec)
|
|
char[2] escapeSequence = ['\\', cast(char)c];
|
|
reader_.sliceBuilder.write(escapeSequence);
|
|
}
|
|
else if(dyaml.escapes.escapeHexCodeList.canFind(c))
|
|
{
|
|
const hexLength = dyaml.escapes.escapeHexLength(c);
|
|
reader_.forward();
|
|
|
|
foreach(i; 0 .. hexLength) if(!reader_.peek(i).isHexDigit)
|
|
{
|
|
error("While scanning a double quoted scalar", startMark,
|
|
expected("escape sequence of hexadecimal numbers",
|
|
reader_.peek(i)), reader_.mark);
|
|
return;
|
|
}
|
|
char[] hex = reader_.get(hexLength);
|
|
char[2] escapeStart = ['\\', cast(char) c];
|
|
reader_.sliceBuilder.write(escapeStart);
|
|
reader_.sliceBuilder.write(hex);
|
|
// Note: This is just error checking; Parser does the actual
|
|
// escaping (otherwise we could accidentally create an
|
|
// escape sequence here that wasn't in input, breaking the
|
|
// escaping code in parser, which is in parser because it
|
|
// can't always be done in place)
|
|
try {
|
|
parse!int(hex, 16u);
|
|
}
|
|
catch (Exception)
|
|
{
|
|
error("While scanning a double quoted scalar", startMark,
|
|
"overflow when parsing an escape sequence of " ~
|
|
"hexadecimal numbers.", reader_.mark);
|
|
return;
|
|
}
|
|
}
|
|
else if("\n\r\u0085\u2028\u2029"d.canFind(c))
|
|
{
|
|
scanLineBreak();
|
|
scanFlowScalarBreaksToSlice(startMark);
|
|
if(error_) { return; }
|
|
}
|
|
else
|
|
{
|
|
error("While scanning a double quoted scalar", startMark,
|
|
buildMsg("found unsupported escape character", c),
|
|
reader_.mark);
|
|
return;
|
|
}
|
|
}
|
|
else { return; }
|
|
}
|
|
}
|
|
|
|
/// Scan space characters in a flow scalar.
|
|
///
|
|
/// Assumes that the caller is building a slice in Reader, and puts the scanned
|
|
/// spaces into that slice.
|
|
///
|
|
/// In case of an error, error_ is set. Use throwIfError() to handle this.
|
|
void scanFlowScalarSpacesToSlice(const Mark startMark) @safe
|
|
{
|
|
// Increase length as long as we see whitespace.
|
|
size_t length;
|
|
while(" \t"d.canFind(reader_.peekByte(length))) { ++length; }
|
|
auto whitespaces = reader_.prefixBytes(length);
|
|
|
|
// Can check the last byte without striding because '\0' is ASCII
|
|
const c = reader_.peek(length);
|
|
if(c == '\0')
|
|
{
|
|
error("While scanning a quoted scalar", startMark,
|
|
"found unexpected end of buffer", reader_.mark);
|
|
return;
|
|
}
|
|
|
|
// Spaces not followed by a line break.
|
|
if(!"\n\r\u0085\u2028\u2029"d.canFind(c))
|
|
{
|
|
reader_.forward(length);
|
|
reader_.sliceBuilder.write(whitespaces);
|
|
return;
|
|
}
|
|
|
|
// There's a line break after the spaces.
|
|
reader_.forward(length);
|
|
const lineBreak = scanLineBreak();
|
|
|
|
if(lineBreak != '\n') { reader_.sliceBuilder.write(lineBreak); }
|
|
|
|
// If we have extra line breaks after the first, scan them into the
|
|
// slice.
|
|
const bool extraBreaks = scanFlowScalarBreaksToSlice(startMark);
|
|
if(error_) { return; }
|
|
|
|
// No extra breaks, one normal line break. Replace it with a space.
|
|
if(lineBreak == '\n' && !extraBreaks) { reader_.sliceBuilder.write(' '); }
|
|
}
|
|
|
|
/// Scan line breaks in a flow scalar.
|
|
///
|
|
/// Assumes that the caller is building a slice in Reader, and puts the scanned
|
|
/// line breaks into that slice.
|
|
///
|
|
/// In case of an error, error_ is set. Use throwIfError() to handle this.
|
|
bool scanFlowScalarBreaksToSlice(const Mark startMark) @safe
|
|
{
|
|
// True if at least one line break was found.
|
|
bool anyBreaks;
|
|
for(;;)
|
|
{
|
|
// Instead of checking indentation, we check for document separators.
|
|
const prefix = reader_.prefix(3);
|
|
if((prefix == "---" || prefix == "...") &&
|
|
reader_.peek(3).isWhiteSpace)
|
|
{
|
|
error("While scanning a quoted scalar", startMark,
|
|
"found unexpected document separator", reader_.mark);
|
|
return false;
|
|
}
|
|
|
|
// Skip any whitespaces.
|
|
while(" \t"d.canFind(reader_.peekByte())) { reader_.forward(); }
|
|
|
|
// Encountered a non-whitespace non-linebreak character, so we're done.
|
|
if(!"\n\r\u0085\u2028\u2029"d.canFind(reader_.peek())) { break; }
|
|
|
|
const lineBreak = scanLineBreak();
|
|
anyBreaks = true;
|
|
reader_.sliceBuilder.write(lineBreak);
|
|
}
|
|
return anyBreaks;
|
|
}
|
|
|
|
/// Scan plain scalar token (no block, no quotes).
|
|
///
|
|
/// In case of an error, error_ is set. Use throwIfError() to handle this.
|
|
Token scanPlain() @safe
|
|
{
|
|
// We keep track of the allowSimpleKey_ flag here.
|
|
// Indentation rules are loosed for the flow context
|
|
const startMark = reader_.mark;
|
|
Mark endMark = startMark;
|
|
const indent = indent_ + 1;
|
|
|
|
// We allow zero indentation for scalars, but then we need to check for
|
|
// document separators at the beginning of the line.
|
|
// if(indent == 0) { indent = 1; }
|
|
|
|
reader_.sliceBuilder.begin();
|
|
|
|
alias Transaction = SliceBuilder.Transaction;
|
|
Transaction spacesTransaction;
|
|
// Stop at a comment.
|
|
while(reader_.peekByte() != '#')
|
|
{
|
|
// Scan the entire plain scalar.
|
|
size_t length;
|
|
dchar c = void;
|
|
// Moved the if() out of the loop for optimization.
|
|
if(flowLevel_ == 0)
|
|
{
|
|
c = reader_.peek(length);
|
|
for(;;)
|
|
{
|
|
const cNext = reader_.peek(length + 1);
|
|
if(c.isWhiteSpace ||
|
|
(c == ':' && cNext.isWhiteSpace))
|
|
{
|
|
break;
|
|
}
|
|
++length;
|
|
c = cNext;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
for(;;)
|
|
{
|
|
c = reader_.peek(length);
|
|
if(c.isWhiteSpace || ",:?[]{}"d.canFind(c))
|
|
{
|
|
break;
|
|
}
|
|
++length;
|
|
}
|
|
}
|
|
|
|
// It's not clear what we should do with ':' in the flow context.
|
|
if(flowLevel_ > 0 && c == ':' &&
|
|
!reader_.peek(length + 1).isWhiteSpace &&
|
|
!",[]{}"d.canFind(reader_.peek(length + 1)))
|
|
{
|
|
// This is an error; throw the slice away.
|
|
spacesTransaction.commit();
|
|
reader_.sliceBuilder.finish();
|
|
reader_.forward(length);
|
|
error("While scanning a plain scalar", startMark,
|
|
"found unexpected ':' . Please check " ~
|
|
"http://pyyaml.org/wiki/YAMLColonInFlowContext for details.",
|
|
reader_.mark);
|
|
return Token.init;
|
|
}
|
|
|
|
if(length == 0) { break; }
|
|
|
|
allowSimpleKey_ = false;
|
|
|
|
reader_.sliceBuilder.write(reader_.get(length));
|
|
|
|
endMark = reader_.mark;
|
|
|
|
spacesTransaction.commit();
|
|
spacesTransaction = Transaction(&reader_.sliceBuilder);
|
|
|
|
const startLength = reader_.sliceBuilder.length;
|
|
scanPlainSpacesToSlice();
|
|
if(startLength == reader_.sliceBuilder.length ||
|
|
(flowLevel_ == 0 && reader_.column < indent))
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
|
|
spacesTransaction.end();
|
|
char[] slice = reader_.sliceBuilder.finish();
|
|
|
|
return scalarToken(startMark, endMark, slice, ScalarStyle.plain);
|
|
}
|
|
|
|
/// Scan spaces in a plain scalar.
|
|
///
|
|
/// Assumes that the caller is building a slice in Reader, and puts the spaces
|
|
/// into that slice.
|
|
void scanPlainSpacesToSlice() @safe
|
|
{
|
|
// The specification is really confusing about tabs in plain scalars.
|
|
// We just forbid them completely. Do not use tabs in YAML!
|
|
|
|
// Get as many plain spaces as there are.
|
|
size_t length;
|
|
while(reader_.peekByte(length) == ' ') { ++length; }
|
|
char[] whitespaces = reader_.prefixBytes(length);
|
|
reader_.forward(length);
|
|
|
|
const dchar c = reader_.peek();
|
|
if(!c.isNSChar)
|
|
{
|
|
// We have spaces, but no newline.
|
|
if(whitespaces.length > 0) { reader_.sliceBuilder.write(whitespaces); }
|
|
return;
|
|
}
|
|
|
|
// Newline after the spaces (if any)
|
|
const lineBreak = scanLineBreak();
|
|
allowSimpleKey_ = true;
|
|
|
|
static bool end(Reader reader_) @safe pure
|
|
{
|
|
const prefix = reader_.prefix(3);
|
|
return ("---" == prefix || "..." == prefix)
|
|
&& " \t\0\n\r\u0085\u2028\u2029"d.canFind(reader_.peek(3));
|
|
}
|
|
|
|
if(end(reader_)) { return; }
|
|
|
|
bool extraBreaks;
|
|
|
|
alias Transaction = SliceBuilder.Transaction;
|
|
auto transaction = Transaction(&reader_.sliceBuilder);
|
|
if(lineBreak != '\n') { reader_.sliceBuilder.write(lineBreak); }
|
|
while(reader_.peek().isNSChar)
|
|
{
|
|
if(reader_.peekByte() == ' ') { reader_.forward(); }
|
|
else
|
|
{
|
|
const lBreak = scanLineBreak();
|
|
extraBreaks = true;
|
|
reader_.sliceBuilder.write(lBreak);
|
|
|
|
if(end(reader_)) { return; }
|
|
}
|
|
}
|
|
transaction.commit();
|
|
|
|
// No line breaks, only a space.
|
|
if(lineBreak == '\n' && !extraBreaks) { reader_.sliceBuilder.write(' '); }
|
|
}
|
|
|
|
/// Scan handle of a tag token.
|
|
///
|
|
/// Assumes that the caller is building a slice in Reader, and puts the scanned
|
|
/// characters into that slice.
|
|
///
|
|
/// In case of an error, error_ is set. Use throwIfError() to handle this.
|
|
void scanTagHandleToSlice(string name)(const Mark startMark)
|
|
{
|
|
dchar c = reader_.peek();
|
|
enum contextMsg = "While scanning a " ~ name;
|
|
if(c != '!')
|
|
{
|
|
error(contextMsg, startMark, expected("'!'", c), reader_.mark);
|
|
return;
|
|
}
|
|
|
|
uint length = 1;
|
|
c = reader_.peek(length);
|
|
if(c != ' ')
|
|
{
|
|
while(c.isAlphaNum || "-_"d.canFind(c))
|
|
{
|
|
++length;
|
|
c = reader_.peek(length);
|
|
}
|
|
if(c != '!')
|
|
{
|
|
reader_.forward(length);
|
|
error(contextMsg, startMark, expected("'!'", c), reader_.mark);
|
|
return;
|
|
}
|
|
++length;
|
|
}
|
|
|
|
reader_.sliceBuilder.write(reader_.get(length));
|
|
}
|
|
|
|
/// Scan URI in a tag token.
|
|
///
|
|
/// Assumes that the caller is building a slice in Reader, and puts the scanned
|
|
/// characters into that slice.
|
|
///
|
|
/// In case of an error, error_ is set. Use throwIfError() to handle this.
|
|
void scanTagURIToSlice(string name)(const Mark startMark)
|
|
{
|
|
// Note: we do not check if URI is well-formed.
|
|
dchar c = reader_.peek();
|
|
const startLen = reader_.sliceBuilder.length;
|
|
{
|
|
uint length;
|
|
while(c.isAlphaNum || c.isURIChar)
|
|
{
|
|
if(c == '%')
|
|
{
|
|
auto chars = reader_.get(length);
|
|
reader_.sliceBuilder.write(chars);
|
|
length = 0;
|
|
scanURIEscapesToSlice!name(startMark);
|
|
if(error_) { return; }
|
|
}
|
|
else { ++length; }
|
|
c = reader_.peek(length);
|
|
}
|
|
if(length > 0)
|
|
{
|
|
auto chars = reader_.get(length);
|
|
reader_.sliceBuilder.write(chars);
|
|
length = 0;
|
|
}
|
|
}
|
|
// OK if we scanned something, error otherwise.
|
|
if(reader_.sliceBuilder.length > startLen) { return; }
|
|
|
|
enum contextMsg = "While parsing a " ~ name;
|
|
error(contextMsg, startMark, expected("URI", c), reader_.mark);
|
|
}
|
|
|
|
// Not @nogc yet because std.utf.decode is not @nogc
|
|
/// Scan URI escape sequences.
|
|
///
|
|
/// Assumes that the caller is building a slice in Reader, and puts the scanned
|
|
/// characters into that slice.
|
|
///
|
|
/// In case of an error, error_ is set. Use throwIfError() to handle this.
|
|
void scanURIEscapesToSlice(string name)(const Mark startMark)
|
|
{
|
|
import core.exception : UnicodeException;
|
|
// URI escapes encode a UTF-8 string. We store UTF-8 code units here for
|
|
// decoding into UTF-32.
|
|
Appender!string buffer;
|
|
|
|
|
|
enum contextMsg = "While scanning a " ~ name;
|
|
while(reader_.peekByte() == '%')
|
|
{
|
|
reader_.forward();
|
|
char[2] nextByte = [reader_.peekByte(), reader_.peekByte(1)];
|
|
if(!nextByte[0].isHexDigit || !nextByte[1].isHexDigit)
|
|
{
|
|
auto msg = expected("URI escape sequence of 2 hexadecimal " ~
|
|
"numbers", nextByte);
|
|
error(contextMsg, startMark, msg, reader_.mark);
|
|
return;
|
|
}
|
|
buffer ~= nextByte[].to!ubyte(16);
|
|
|
|
reader_.forward(2);
|
|
}
|
|
try
|
|
{
|
|
foreach (dchar chr; buffer.data)
|
|
{
|
|
reader_.sliceBuilder.write(chr);
|
|
}
|
|
}
|
|
catch (UnicodeException)
|
|
{
|
|
error(contextMsg, startMark,
|
|
"Invalid UTF-8 data encoded in URI escape sequence",
|
|
reader_.mark);
|
|
return;
|
|
}
|
|
}
|
|
|
|
|
|
/// Scan a line break, if any.
|
|
///
|
|
/// Transforms:
|
|
/// '\r\n' : '\n'
|
|
/// '\r' : '\n'
|
|
/// '\n' : '\n'
|
|
/// '\u0085' : '\n'
|
|
/// '\u2028' : '\u2028'
|
|
/// '\u2029 : '\u2029'
|
|
/// no break : '\0'
|
|
dchar scanLineBreak() @safe
|
|
{
|
|
// Fast path for ASCII line breaks.
|
|
const b = reader_.peekByte();
|
|
if(b < 0x80)
|
|
{
|
|
if(b == '\n' || b == '\r')
|
|
{
|
|
if(reader_.prefix(2) == "\r\n") { reader_.forward(2); }
|
|
else { reader_.forward(); }
|
|
return '\n';
|
|
}
|
|
return '\0';
|
|
}
|
|
|
|
const c = reader_.peek();
|
|
if(c == '\x85')
|
|
{
|
|
reader_.forward();
|
|
return '\n';
|
|
}
|
|
if(c == '\u2028' || c == '\u2029')
|
|
{
|
|
reader_.forward();
|
|
return c;
|
|
}
|
|
return '\0';
|
|
}
|
|
}
|
|
|
|
private:
|
|
|
|
/// A nothrow function that converts a dchar[] to a string.
|
|
string utf32To8(C)(C[] str)
|
|
if(is(Unqual!C == dchar))
|
|
{
|
|
try { return str.to!string; }
|
|
catch(ConvException e) { assert(false, "Unexpected invalid UTF-32 string"); }
|
|
catch(Exception e) { assert(false, "Unexpected exception during UTF-8 encoding"); }
|
|
}
|