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As ECMA262 regex allows `[^]` and literal newlines to match newlines in the input string, we shouldn't split the input string into lines, rather simply make boundaries and catchall patterns capable of checking for these conditions specifically.
108 lines
6.7 KiB
C
108 lines
6.7 KiB
C
/*
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* Copyright (c) 2020, Emanuel Sprung <emanuel.sprung@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <stddef.h>
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#include <sys/types.h>
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__BEGIN_DECLS
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typedef ssize_t regoff_t;
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typedef struct {
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void* __data;
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// Number of capture groups, Dr.POSIX requires this.
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size_t re_nsub;
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} regex_t;
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enum __Regex_Error {
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__Regex_NoError,
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__Regex_InvalidPattern, // Invalid regular expression.
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__Regex_InvalidCollationElement, // Invalid collating element referenced.
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__Regex_InvalidCharacterClass, // Invalid character class type referenced.
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__Regex_InvalidTrailingEscape, // Trailing \ in pattern.
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__Regex_InvalidNumber, // Number in \digit invalid or in error.
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__Regex_MismatchingBracket, // [ ] imbalance.
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__Regex_MismatchingParen, // ( ) imbalance.
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__Regex_MismatchingBrace, // { } imbalance.
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__Regex_InvalidBraceContent, // Content of {} invalid: not a number, number too large, more than two numbers, first larger than second.
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__Regex_InvalidBracketContent, // Content of [] invalid.
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__Regex_InvalidRange, // Invalid endpoint in range expression.
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__Regex_InvalidRepetitionMarker, // ?, * or + not preceded by valid regular expression.
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__Regex_ReachedMaxRecursion, // MaximumRecursion has been reached.
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__Regex_EmptySubExpression, // Sub expression has empty content.
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__Regex_InvalidCaptureGroup, // Content of capture group is invalid.
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__Regex_InvalidNameForCaptureGroup, // Name of capture group is invalid.
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__Regex_InvalidNameForProperty, // Name of property is invalid.
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__Regex_DuplicateNamedCapture, // Duplicate named capture group
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};
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enum ReError {
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REG_NOERR = __Regex_NoError,
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REG_BADPAT = __Regex_InvalidPattern, // Invalid regular expression.
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REG_ECOLLATE = __Regex_InvalidCollationElement, // Invalid collating element referenced.
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REG_ECTYPE = __Regex_InvalidCharacterClass, // Invalid character class type referenced.
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REG_EESCAPE = __Regex_InvalidTrailingEscape, // Trailing \ in pattern.
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REG_ESUBREG = __Regex_InvalidNumber, // Number in \digit invalid or in error.
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REG_EBRACK = __Regex_MismatchingBracket, // [ ] imbalance.
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REG_EPAREN = __Regex_MismatchingParen, // \( \) or ( ) imbalance.
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REG_EBRACE = __Regex_MismatchingBrace, // \{ \} imbalance.
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REG_BADBR = __Regex_InvalidBraceContent, // Content of \{ \} invalid: not a number, number too large, more than two numbers, first larger than second.
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REG_ERANGE = __Regex_InvalidRange, // Invalid endpoint in range expression.
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REG_BADRPT = __Regex_InvalidRepetitionMarker, // ?, * or + not preceded by valid regular expression.
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REG_EMPTY_EXPR = __Regex_EmptySubExpression, // Empty expression
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REG_ENOSYS, // The implementation does not support the function.
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REG_ESPACE, // Out of memory.
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REG_NOMATCH, // regexec() failed to match.
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};
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typedef struct {
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regoff_t rm_so; // byte offset from start of string to start of substring
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regoff_t rm_eo; // byte offset from start of string of the first character after the end of substring
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regoff_t rm_cnt; // number of matches
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} regmatch_t;
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enum __RegexAllFlags {
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__Regex_Global = 1, // All matches (don't return after first match)
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__Regex_Insensitive = __Regex_Global << 1, // Case insensitive match (ignores case of [a-zA-Z])
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__Regex_Ungreedy = __Regex_Global << 2, // The match becomes lazy by default. Now a ? following a quantifier makes it greedy
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__Regex_Unicode = __Regex_Global << 3, // Enable all unicode features and interpret all unicode escape sequences as such
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__Regex_Extended = __Regex_Global << 4, // Ignore whitespaces. Spaces and text after a # in the pattern are ignored
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__Regex_Extra = __Regex_Global << 5, // Disallow meaningless escapes. A \ followed by a letter with no special meaning is faulted
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__Regex_MatchNotBeginOfLine = __Regex_Global << 6, // Pattern is not forced to ^ -> search in whole string!
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__Regex_MatchNotEndOfLine = __Regex_Global << 7, // Don't Force the dollar sign, $, to always match end of the string, instead of end of the line. This option is ignored if the Multiline-flag is set
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__Regex_SkipSubExprResults = __Regex_Global << 8, // Do not return sub expressions in the result
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__Regex_StringCopyMatches = __Regex_Global << 9, // Do explicitly copy results into new allocated string instead of StringView to original string.
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__Regex_SingleLine = __Regex_Global << 10, // Dot matches newline characters
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__Regex_Sticky = __Regex_Global << 11, // Force the pattern to only match consecutive matches from where the previous match ended.
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__Regex_Multiline = __Regex_Global << 12, // Handle newline characters. Match each line, one by one.
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__Regex_SkipTrimEmptyMatches = __Regex_Global << 13, // Do not remove empty capture group results.
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__Regex_Internal_Stateful = __Regex_Global << 14, // Internal flag; enables stateful matches.
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__Regex_Internal_BrowserExtended = __Regex_Global << 15, // Internal flag; enable browser-specific ECMA262 extensions.
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__Regex_Internal_ConsiderNewline = __Regex_Global << 16, // Internal flag; allow matchers to consider newlines as line separators.
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__Regex_Last = __Regex_SkipTrimEmptyMatches
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};
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// Values for the cflags parameter to the regcomp() function:
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#define REG_EXTENDED __Regex_Extended // Use Extended Regular Expressions.
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#define REG_ICASE __Regex_Insensitive // Ignore case in match.
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#define REG_NOSUB __Regex_SkipSubExprResults // Report only success or fail in regexec().
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#define REG_GLOBAL __Regex_Global // Don't stop searching for more match
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#define REG_NEWLINE (__Regex_Multiline | REG_GLOBAL) // Change the handling of newline.
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// Values for the eflags parameter to the regexec() function:
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#define REG_NOTBOL __Regex_MatchNotBeginOfLine // The circumflex character (^), when taken as a special character, will not match the beginning of string.
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#define REG_NOTEOL __Regex_MatchNotEndOfLine // The dollar sign ($), when taken as a special character, will not match the end of string.
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#define REG_SEARCH __Regex_Last << 1
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int regcomp(regex_t*, const char*, int);
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int regexec(const regex_t*, const char*, size_t, regmatch_t[], int);
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size_t regerror(int, const regex_t*, char*, size_t);
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void regfree(regex_t*);
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__END_DECLS
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