exp.h

Go to the documentation of this file.

#ifndef EXP_H_62B23520_7C8E_11DE_8A39_0800200C9A66
#define EXP_H_62B23520_7C8E_11DE_8A39_0800200C9A66

#if defined(_MSC_VER) || (defined(__GNUC__) && (__GNUC__ == 3 && __GNUC_MINOR__ >= 4) || (__GNUC__ >= 4)) // GCC supports "pragma once" correctly since 3.4
#pragma once
#endif


#include "regex.h"
#include <string>
#include <ios>
#include "stream.h"

namespace YAML_PM
{
        // Here we store a bunch of expressions for matching different parts of the file.

        namespace Exp
        {
                // misc
                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)
                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

                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& Anchor() {
                        static const RegEx e = !(RegEx("[]{},", REGEX_OR) || BlankOrBreak());
                        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.
                inline const RegEx& PlainScalar() {
                        static const RegEx e = !(BlankOrBreak() || RegEx(",[]{}#&*!|>\'\"%@`", REGEX_OR) || (RegEx("-?:", REGEX_OR) + (BlankOrBreak() || RegEx())));
                        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(",]}", REGEX_OR))) || RegEx(",?[]{}", REGEX_OR);
                        return e;
                }

                inline const RegEx& EscSingleQuote() {
                        static const RegEx e = RegEx("\'\'");
                        return e;
                }
                inline const RegEx& EscBreak() {
                        static const RegEx e = RegEx('\\') + Break();
                        return e;
                }

                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);
        }

        namespace Keys
        {
                const char Directive = '%';
                const char FlowSeqStart = '[';
                const char FlowSeqEnd = ']';
                const char FlowMapStart = '{';
                const char FlowMapEnd = '}';
                const char FlowEntry = ',';
                const char Alias = '*';
                const char Anchor = '&';
                const char Tag = '!';
                const char LiteralScalar = '|';
                const char FoldedScalar = '>';
                const char VerbatimTagStart = '<';
                const char VerbatimTagEnd = '>';
        }
}

#endif // EXP_H_62B23520_7C8E_11DE_8A39_0800200C9A66