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Switched the Exp:: regexes to functions that lazily evaluate their regexes

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jbeder
2009-11-04 22:56:59 +00:00
parent fea35e3e8f
commit ca79c3da7f
6 changed files with 182 additions and 83 deletions
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171
src/exp.h
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@@ -17,54 +17,153 @@ namespace YAML
namespace Exp
{
// misc
const RegEx Space = RegEx(' ');
const RegEx Tab = RegEx('\t');
const RegEx Blank = Space || Tab;
const RegEx Break = RegEx('\n') || RegEx("\r\n");
const RegEx BlankOrBreak = Blank || Break;
const RegEx Digit = RegEx('0', '9');
const RegEx Alpha = RegEx('a', 'z') || RegEx('A', 'Z');
const RegEx AlphaNumeric = Alpha || Digit;
const RegEx Word = AlphaNumeric || RegEx('-');
const RegEx Hex = Digit || RegEx('A', 'F') || RegEx('a', 'f');
inline const RegEx& Space() {
static const RegEx e = RegEx(' ');
return e;
}
inline const RegEx& Tab() {
static const RegEx e = RegEx('\t');
return e;
}
inline const RegEx& Blank() {
static const RegEx e = Space() || Tab();
return e;
}
inline const RegEx& Break() {
static const RegEx e = RegEx('\n') || RegEx("\r\n");
return e;
}
inline const RegEx& BlankOrBreak() {
static const RegEx e = Blank() || Break();
return e;
}
inline const RegEx& Digit() {
static const RegEx e = RegEx('0', '9');
return e;
}
inline const RegEx& Alpha() {
static const RegEx e = RegEx('a', 'z') || RegEx('A', 'Z');
return e;
}
inline const RegEx& AlphaNumeric() {
static const RegEx e = Alpha() || Digit();
return e;
}
inline const RegEx& Word() {
static const RegEx e = AlphaNumeric() || RegEx('-');
return e;
}
inline const RegEx& Hex() {
static const RegEx e = Digit() || RegEx('A', 'F') || RegEx('a', 'f');
return e;
}
// Valid Unicode code points that are not part of c-printable (YAML 1.2, sec. 5.1)
const RegEx NotPrintable = RegEx(0) ||
RegEx("\x01\x02\x03\x04\x05\x06\x07\x08\x0B\x0C\x7F", REGEX_OR) ||
RegEx(0x0E, 0x1F) ||
(RegEx('\xC2') + (RegEx('\x80', '\x84') || RegEx('\x86', '\x9F')));
const RegEx Utf8_ByteOrderMark = RegEx("\xEF\xBB\xBF");
inline const RegEx& NotPrintable() {
static const RegEx e = RegEx(0) ||
RegEx("\x01\x02\x03\x04\x05\x06\x07\x08\x0B\x0C\x7F", REGEX_OR) ||
RegEx(0x0E, 0x1F) ||
(RegEx('\xC2') + (RegEx('\x80', '\x84') || RegEx('\x86', '\x9F')));
return e;
}
inline const RegEx& Utf8_ByteOrderMark() {
static const RegEx e = RegEx("\xEF\xBB\xBF");
return e;
}
// actual tags
const RegEx DocStart = RegEx("---") + (BlankOrBreak || RegEx());
const RegEx DocEnd = RegEx("...") + (BlankOrBreak || RegEx());
const RegEx DocIndicator = DocStart || DocEnd;
const RegEx BlockEntry = RegEx('-') + (BlankOrBreak || RegEx());
const RegEx Key = RegEx('?'),
KeyInFlow = RegEx('?') + BlankOrBreak;
const RegEx Value = RegEx(':') + (BlankOrBreak || RegEx()),
ValueInFlow = RegEx(':') + (BlankOrBreak || RegEx(",}", REGEX_OR)),
ValueInJSONFlow = RegEx(':');
const RegEx Comment = RegEx('#');
const RegEx AnchorEnd = RegEx("?:,]}%@`", REGEX_OR) || BlankOrBreak;
const RegEx URI = Word || RegEx("#;/?:@&=+$,_.!~*'()[]", REGEX_OR) || (RegEx('%') + Hex + Hex);
const RegEx Tag = Word || RegEx("#;/?:@&=+$_.~*'", REGEX_OR) || (RegEx('%') + Hex + Hex);
inline const RegEx& DocStart() {
static const RegEx e = RegEx("---") + (BlankOrBreak() || RegEx());
return e;
}
inline const RegEx& DocEnd() {
static const RegEx e = RegEx("...") + (BlankOrBreak() || RegEx());
return e;
}
inline const RegEx& DocIndicator() {
static const RegEx e = DocStart || DocEnd;
return e;
}
inline const RegEx& BlockEntry() {
static const RegEx e = RegEx('-') + (BlankOrBreak() || RegEx());
return e;
}
inline const RegEx& Key() {
static const RegEx e = RegEx('?');
return e;
}
inline const RegEx& KeyInFlow() {
static const RegEx e = RegEx('?') + BlankOrBreak();
return e;
}
inline const RegEx& Value() {
static const RegEx e = RegEx(':') + (BlankOrBreak() || RegEx());
return e;
}
inline const RegEx& ValueInFlow() {
static const RegEx e = RegEx(':') + (BlankOrBreak() || RegEx(",}", REGEX_OR));
return e;
}
inline const RegEx& ValueInJSONFlow() {
static const RegEx e = RegEx(':');
return e;
}
inline const RegEx Comment() {
static const RegEx e = RegEx('#');
return e;
}
inline const RegEx& AnchorEnd() {
static const RegEx e = RegEx("?:,]}%@`", REGEX_OR) || BlankOrBreak();
return e;
}
inline const RegEx& URI() {
static const RegEx e = Word() || RegEx("#;/?:@&=+$,_.!~*'()[]", REGEX_OR) || (RegEx('%') + Hex() + Hex());
return e;
}
inline const RegEx& Tag() {
static const RegEx e = Word() || RegEx("#;/?:@&=+$_.~*'", REGEX_OR) || (RegEx('%') + Hex() + Hex());
return e;
}
// Plain scalar rules:
// . Cannot start with a blank.
// . Can never start with any of , [ ] { } # & * ! | > \' \" % @ `
// . In the block context - ? : must be not be followed with a space.
// . In the flow context ? is illegal and : and - must not be followed with a space.
const RegEx PlainScalar = !(BlankOrBreak || RegEx(",[]{}#&*!|>\'\"%@`", REGEX_OR) || (RegEx("-?:", REGEX_OR) + Blank)),
PlainScalarInFlow = !(BlankOrBreak || RegEx("?,[]{}#&*!|>\'\"%@`", REGEX_OR) || (RegEx("-:", REGEX_OR) + Blank));
const RegEx EndScalar = RegEx(':') + (BlankOrBreak || RegEx()),
EndScalarInFlow = (RegEx(':') + (BlankOrBreak || RegEx(",]}", REGEX_OR))) || RegEx(",?[]{}", REGEX_OR);
inline const RegEx& PlainScalar() {
static const RegEx e = !(BlankOrBreak() || RegEx(",[]{}#&*!|>\'\"%@`", REGEX_OR) || (RegEx("-?:", REGEX_OR) + Blank()));
return e;
}
inline const RegEx& PlainScalarInFlow() {
static const RegEx e = !(BlankOrBreak() || RegEx("?,[]{}#&*!|>\'\"%@`", REGEX_OR) || (RegEx("-:", REGEX_OR) + Blank()));
return e;
}
inline const RegEx& EndScalar() {
static const RegEx e = RegEx(':') + (BlankOrBreak() || RegEx());
return e;
}
inline const RegEx& EndScalarInFlow() {
static const RegEx e = (RegEx(':') + (BlankOrBreak() || RegEx(",]}", REGEX_OR))) || RegEx(",?[]{}", REGEX_OR);
return e;
}
const RegEx EscSingleQuote = RegEx("\'\'");
const RegEx EscBreak = RegEx('\\') + Break;
inline const RegEx& EscSingleQuote() {
static const RegEx e = RegEx("\'\'");
return e;
}
inline const RegEx& EscBreak() {
static const RegEx e = RegEx('\\') + Break();
return e;
}
const RegEx ChompIndicator = RegEx("+-", REGEX_OR);
const RegEx Chomp = (ChompIndicator + Digit) || (Digit + ChompIndicator) || ChompIndicator || Digit;
inline const RegEx& ChompIndicator() {
static const RegEx e = RegEx("+-", REGEX_OR);
return e;
}
inline const RegEx& Chomp() {
static const RegEx e = (ChompIndicator() + Digit()) || (Digit() + ChompIndicator()) || ChompIndicator() || Digit();
return e;
}
// and some functions
std::string Escape(Stream& in);