91 lines
2.5 KiB
D
91 lines
2.5 KiB
D
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// Copyright Ferdinand Majerech 2011.
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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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module dyaml.escapes;
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package:
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///Translation table from YAML escapes to dchars.
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// immutable dchar[dchar] fromEscapes;
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///Translation table from dchars to YAML escapes.
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immutable dchar[dchar] toEscapes;
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// ///Translation table from prefixes of escaped hexadecimal format characters to their lengths.
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// immutable uint[dchar] escapeHexCodes;
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/// All YAML escapes.
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immutable dchar[] escapes = ['0', 'a', 'b', 't', '\t', 'n', 'v', 'f', 'r', 'e', ' ',
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'\"', '\\', 'N', '_', 'L', 'P'];
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/// YAML hex codes specifying the length of the hex number.
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immutable dchar[] escapeHexCodeList = ['x', 'u', 'U'];
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/// Covert a YAML escape to a dchar.
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///
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/// Need a function as associative arrays don't work with @nogc.
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/// (And this may be even faster with a function.)
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dchar fromEscape(dchar escape) @safe pure nothrow @nogc
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{
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switch(escape)
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{
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case '0': return '\0';
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case 'a': return '\x07';
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case 'b': return '\x08';
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case 't': return '\x09';
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case '\t': return '\x09';
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case 'n': return '\x0A';
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case 'v': return '\x0B';
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case 'f': return '\x0C';
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case 'r': return '\x0D';
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case 'e': return '\x1B';
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case ' ': return '\x20';
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case '\"': return '\"';
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case '\\': return '\\';
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case 'N': return '\x85'; //'\u0085';
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case '_': return '\xA0';
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case 'L': return '\u2028';
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case 'P': return '\u2029';
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default: assert(false, "No such YAML escape");
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}
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}
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/// Get the length of a hexadecimal number determined by its hex code.
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///
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/// Need a function as associative arrays don't work with @nogc.
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/// (And this may be even faster with a function.)
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uint escapeHexLength(dchar hexCode) @safe pure nothrow @nogc
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{
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switch(hexCode)
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{
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case 'x': return 2;
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case 'u': return 4;
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case 'U': return 8;
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default: assert(false, "No such YAML hex code");
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}
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}
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static this()
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{
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toEscapes =
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['\0': '0',
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'\x07': 'a',
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'\x08': 'b',
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'\x09': 't',
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'\x0A': 'n',
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'\x0B': 'v',
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'\x0C': 'f',
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'\x0D': 'r',
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'\x1B': 'e',
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'\"': '\"',
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'\\': '\\',
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'\u0085': 'N',
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'\xA0': '_',
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'\u2028': 'L',
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'\u2029': 'P'];
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}
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