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use enforce for most Scanner exceptions

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Cameron Ross 2019-03-17 19:56:25 -03:00
parent c7b8ff8a1b
commit dc9aa4ab9c
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GPG key ID: 777897D98DC91C54
1 changed files with 98 additions and 146 deletions
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244
source/dyaml/scanner.d
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@ -749,12 +749,8 @@ struct Scanner
dchar c = reader_.peek();
while(c.isAlphaNum || c.among!('-', '_')) { c = reader_.peek(++length); }
if(length == 0)
{
enum contextMsg = "While scanning " ~ name;
throw new ScannerException(contextMsg, startMark, expected("alphanumeric, '-' or '_'", c),
reader_.mark);
}
enforce(length > 0, new ScannerException("While scanning " ~ name,
startMark, expected("alphanumeric, '-' or '_'", c), reader_.mark));
reader_.sliceBuilder.write(reader_.get(length));
}
@ -863,9 +859,9 @@ struct Scanner
// Scan directive name.
scanAlphaNumericToSlice!"a directive"(startMark);
if(reader_.peek().among!(' ', '\0', '\n', '\r', '\u0085', '\u2028', '\u2029')) { return; }
throw new ScannerException("While scanning a directive", startMark,
expected("alphanumeric, '-' or '_'", reader_.peek()), reader_.mark);
enforce(reader_.peek().among!(' ', '\0', '\n', '\r', '\u0085', '\u2028', '\u2029'),
new ScannerException("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 '.'.
@ -878,22 +874,18 @@ struct Scanner
scanYAMLDirectiveNumberToSlice(startMark);
if(reader_.peekByte() != '.')
{
throw new ScannerException("While scanning a directive", startMark,
expected("digit or '.'", reader_.peek()), reader_.mark);
}
enforce(reader_.peekByte() == '.',
new ScannerException("While scanning a directive", startMark,
expected("digit or '.'", reader_.peek()), reader_.mark));
// Skip the '.'.
reader_.forward();
reader_.sliceBuilder.write('.');
scanYAMLDirectiveNumberToSlice(startMark);
if(!reader_.peek().among!(' ', '\0', '\n', '\r', '\u0085', '\u2028', '\u2029'))
{
throw new ScannerException("While scanning a directive", startMark,
expected("digit or '.'", reader_.peek()), reader_.mark);
}
enforce(reader_.peek().among!(' ', '\0', '\n', '\r', '\u0085', '\u2028', '\u2029'),
new ScannerException("While scanning a directive", startMark,
expected("digit or '.'", reader_.peek()), reader_.mark));
}
/// Scan a number from a YAML directive.
@ -902,11 +894,9 @@ struct Scanner
/// characters into that slice.
void scanYAMLDirectiveNumberToSlice(const Mark startMark) @safe
{
if(!isDigit(reader_.peek()))
{
throw new ScannerException("While scanning a directive", startMark,
expected("digit", reader_.peek()), reader_.mark);
}
enforce(isDigit(reader_.peek()),
new ScannerException("While scanning a directive", startMark,
expected("digit", reader_.peek()), reader_.mark));
// Already found the first digit in the enforce(), so set length to 1.
uint length = 1;
@ -940,9 +930,9 @@ struct Scanner
void scanTagDirectiveHandleToSlice(const Mark startMark) @safe
{
scanTagHandleToSlice!"directive"(startMark);
if(reader_.peekByte() == ' ') { return; }
throw new ScannerException("While scanning a directive handle", startMark,
expected("' '", reader_.peek()), reader_.mark);
enforce(reader_.peekByte() == ' ',
new ScannerException("While scanning a directive handle", startMark,
expected("' '", reader_.peek()), reader_.mark));
}
/// Scan prefix of a tag directive.
@ -952,9 +942,9 @@ struct Scanner
void scanTagDirectivePrefixToSlice(const Mark startMark) @safe
{
scanTagURIToSlice!"directive"(startMark);
if(reader_.peek().among!(' ', '\0', '\n', '\r', '\u0085', '\u2028', '\u2029')) { return; }
throw new ScannerException("While scanning a directive prefix", startMark,
expected("' '", reader_.peek()), reader_.mark);
enforce(reader_.peek().among!(' ', '\0', '\n', '\r', '\u0085', '\u2028', '\u2029'),
new ScannerException("While scanning a directive prefix", startMark,
expected("' '", reader_.peek()), reader_.mark));
}
/// Scan (and ignore) ignored line after a directive.
@ -962,13 +952,10 @@ struct Scanner
{
findNextNonSpace();
if(reader_.peekByte() == '#') { scanToNextBreak(); }
if(reader_.peek().isBreak)
{
scanLineBreak();
return;
}
throw new ScannerException("While scanning a directive", startMark,
expected("comment or a line break", reader_.peek()), reader_.mark);
enforce(reader_.peek().isBreak,
new ScannerException("While scanning a directive", startMark,
expected("comment or a line break", reader_.peek()), reader_.mark));
scanLineBreak();
}
@ -993,14 +980,12 @@ struct Scanner
// On error, value is discarded as we return immediately
char[] value = reader_.sliceBuilder.finish();
if(!reader_.peek().isWhiteSpace &&
!reader_.peekByte().among!('?', ':', ',', ']', '}', '%', '@'))
{
enum anchorCtx = "While scanning an anchor";
enum aliasCtx = "While scanning an alias";
throw new ScannerException(i == '*' ? aliasCtx : anchorCtx, startMark,
expected("alphanumeric, '-' or '_'", reader_.peek()), reader_.mark);
}
enum anchorCtx = "While scanning an anchor";
enum aliasCtx = "While scanning an alias";
enforce(reader_.peek().isWhiteSpace ||
reader_.peekByte().among!('?', ':', ',', ']', '}', '%', '@'),
new ScannerException(i == '*' ? aliasCtx : anchorCtx, startMark,
expected("alphanumeric, '-' or '_'", reader_.peek()), reader_.mark));
if(id == TokenID.alias_)
{
@ -1031,11 +1016,9 @@ struct Scanner
handleEnd = 0;
scanTagURIToSlice!"tag"(startMark);
if(reader_.peekByte() != '>')
{
throw new ScannerException("While scanning a tag", startMark,
expected("'>'", reader_.peek()), reader_.mark);
}
enforce(reader_.peekByte() == '>',
new ScannerException("While scanning a tag", startMark,
expected("'>'", reader_.peek()), reader_.mark));
reader_.forward();
}
else if(c.isWhiteSpace)
@ -1075,14 +1058,12 @@ struct Scanner
scanTagURIToSlice!"tag"(startMark);
}
if(reader_.peek().isBreakOrSpace)
{
char[] slice = reader_.sliceBuilder.finish();
return tagToken(startMark, reader_.mark, slice, handleEnd);
}
enforce(reader_.peek().isBreakOrSpace,
new ScannerException("While scanning a tag", startMark, expected("' '", reader_.peek()),
reader_.mark));
throw new ScannerException("While scanning a tag", startMark, expected("' '", reader_.peek()),
reader_.mark);
char[] slice = reader_.sliceBuilder.finish();
return tagToken(startMark, reader_.mark, slice, handleEnd);
}
/// Scan a block scalar token with specified style.
@ -1241,12 +1222,11 @@ struct Scanner
if(gotIncrement) { getChomping(c, chomping); }
}
if(c.among!(' ', '\0', '\n', '\r', '\u0085', '\u2028', '\u2029'))
{
return tuple(chomping, increment);
}
throw new ScannerException("While scanning a block scalar", startMark,
expected("chomping or indentation indicator", c), reader_.mark);
enforce(c.among!(' ', '\0', '\n', '\r', '\u0085', '\u2028', '\u2029'),
new ScannerException("While scanning a block scalar", startMark,
expected("chomping or indentation indicator", c), reader_.mark));
return tuple(chomping, increment);
}
/// Get chomping indicator, if detected. Return false otherwise.
@ -1283,14 +1263,14 @@ struct Scanner
// 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;
}
throw new ScannerException("While scanning a block scalar", startMark,
expected("indentation indicator in range 1-9", "0"), reader_.mark);
enforce(increment > 0,
new ScannerException("While scanning a block scalar", startMark,
expected("indentation indicator in range 1-9", "0"), reader_.mark));
reader_.forward();
c = reader_.peek();
return true;
}
/// Scan (and ignore) ignored line in a block scalar.
@ -1299,13 +1279,11 @@ struct Scanner
findNextNonSpace();
if(reader_.peekByte()== '#') { scanToNextBreak(); }
if(reader_.peek().isBreak)
{
scanLineBreak();
return;
}
throw new ScannerException("While scanning a block scalar", startMark,
expected("comment or line break", reader_.peek()), reader_.mark);
enforce(reader_.peek().isBreak,
new ScannerException("While scanning a block scalar", startMark,
expected("comment or line break", reader_.peek()), reader_.mark));
scanLineBreak();
}
/// Scan indentation in a block scalar, returning line breaks, max indent and end mark.
@ -1391,11 +1369,10 @@ struct Scanner
// 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)
{
throw new ScannerException("While reading a flow scalar", startMark,
"reached end of file", reader_.mark);
}
enforce(slice.length != oldSliceLength,
new ScannerException("While reading a flow scalar", startMark,
"reached end of file", reader_.mark));
for(size_t i = oldSliceLength; i < slice.length;)
{
// slice is UTF-8 - need to decode
@ -1439,31 +1416,22 @@ struct Scanner
reader_.forward();
foreach(i; 0 .. hexLength) {
if(!reader_.peek(i).isHexDigit)
{
throw new ScannerException("While scanning a double quoted scalar", startMark,
expected("escape sequence of hexadecimal numbers",
reader_.peek(i)), reader_.mark);
}
enforce(reader_.peek(i).isHexDigit,
new ScannerException("While scanning a double quoted scalar", startMark,
expected("escape sequence of hexadecimal numbers",
reader_.peek(i)), reader_.mark));
}
char[] hex = reader_.get(hexLength);
enforce((hex.length > 0) && (hex.length <= 8),
new ScannerException("While scanning a double quoted scalar", startMark,
"overflow when parsing an escape sequence of " ~
"hexadecimal numbers.", reader_.mark));
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)
{
throw new ScannerException("While scanning a double quoted scalar", startMark,
"overflow when parsing an escape sequence of " ~
"hexadecimal numbers.", reader_.mark);
}
}
else if(c.among!('\n', '\r', '\u0085', '\u2028', '\u2029'))
{
@ -1473,7 +1441,7 @@ struct Scanner
else
{
throw new ScannerException("While scanning a double quoted scalar", startMark,
text("found unsupported escape character", c),
text("found unsupported escape character ", c),
reader_.mark);
}
}
@ -1494,11 +1462,9 @@ struct Scanner
// Can check the last byte without striding because '\0' is ASCII
const c = reader_.peek(length);
if(c == '\0')
{
throw new ScannerException("While scanning a quoted scalar", startMark,
"found unexpected end of buffer", reader_.mark);
}
enforce(c != '\0',
new ScannerException("While scanning a quoted scalar", startMark,
"found unexpected end of buffer", reader_.mark));
// Spaces not followed by a line break.
if(!c.among!('\n', '\r', '\u0085', '\u2028', '\u2029'))
@ -1534,12 +1500,10 @@ struct Scanner
{
// Instead of checking indentation, we check for document separators.
const prefix = reader_.prefix(3);
if((prefix == "---" || prefix == "...") &&
reader_.peek(3).isWhiteSpace)
{
throw new ScannerException("While scanning a quoted scalar", startMark,
"found unexpected document separator", reader_.mark);
}
enforce(!(prefix == "---" || prefix == "...") ||
!reader_.peek(3).isWhiteSpace,
new ScannerException("While scanning a quoted scalar", startMark,
"found unexpected document separator", reader_.mark));
// Skip any whitespaces.
while(reader_.peekByte().among!(' ', '\t')) { reader_.forward(); }
@ -1607,19 +1571,13 @@ struct Scanner
}
// It's not clear what we should do with ':' in the flow context.
if(flowLevel_ > 0 && c == ':' &&
!reader_.peek(length + 1).isWhiteSpace &&
!reader_.peek(length + 1).among!(',', '[', ']', '{', '}'))
{
// This is an error; throw the slice away.
spacesTransaction.commit();
reader_.sliceBuilder.finish();
reader_.forward(length);
throw new ScannerException("While scanning a plain scalar", startMark,
"found unexpected ':' . Please check " ~
"http://pyyaml.org/wiki/YAMLColonInFlowContext for details.",
reader_.mark);
}
enforce(flowLevel_ == 0 || c != ':' ||
reader_.peek(length + 1).isWhiteSpace ||
reader_.peek(length + 1).among!(',', '[', ']', '{', '}'),
new ScannerException("While scanning a plain scalar", startMark,
"found unexpected ':' . Please check " ~
"http://pyyaml.org/wiki/YAMLColonInFlowContext for details.",
reader_.mark));
if(length == 0) { break; }
@ -1714,10 +1672,8 @@ struct Scanner
{
dchar c = reader_.peek();
enum contextMsg = "While scanning a " ~ name;
if(c != '!')
{
throw new ScannerException(contextMsg, startMark, expected("'!'", c), reader_.mark);
}
enforce(c == '!',
new ScannerException(contextMsg, startMark, expected("'!'", c), reader_.mark));
uint length = 1;
c = reader_.peek(length);
@ -1728,11 +1684,8 @@ struct Scanner
++length;
c = reader_.peek(length);
}
if(c != '!')
{
reader_.forward(length);
throw new ScannerException(contextMsg, startMark, expected("'!'", c), reader_.mark);
}
enforce(c == '!',
new ScannerException(contextMsg, startMark, expected("'!'", c), reader_.mark));
++length;
}
@ -1770,10 +1723,9 @@ struct Scanner
}
}
// OK if we scanned something, error otherwise.
if(reader_.sliceBuilder.length > startLen) { return; }
enum contextMsg = "While parsing a " ~ name;
throw new ScannerException(contextMsg, startMark, expected("URI", c), reader_.mark);
enforce(reader_.sliceBuilder.length > startLen,
new ScannerException(contextMsg, startMark, expected("URI", c), reader_.mark));
}
// Not @nogc yet because std.utf.decode is not @nogc
@ -1794,12 +1746,12 @@ struct Scanner
{
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);
throw new ScannerException(contextMsg, startMark, msg, reader_.mark);
}
enforce(nextByte[0].isHexDigit && nextByte[1].isHexDigit,
new ScannerException(contextMsg, startMark,
expected("URI escape sequence of 2 hexadecimal " ~
"numbers", nextByte), reader_.mark));
buffer ~= nextByte[].to!ubyte(16);
reader_.forward(2);