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/*
* Copyright (c) 2020, Emanuel Sprung <emanuel.sprung@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <stddef.h>
#include <sys/cdefs.h>
#include <sys/types.h>
__BEGIN_DECLS
typedef ssize_t regoff_t;
typedef struct {
void* __data;
// Number of capture groups, Dr.POSIX requires this.
size_t re_nsub;
} regex_t;
enum __Regex_Error {
__Regex_NoError,
__Regex_InvalidPattern, // Invalid regular expression.
__Regex_InvalidCollationElement, // Invalid collating element referenced.
__Regex_InvalidCharacterClass, // Invalid character class type referenced.
__Regex_InvalidTrailingEscape, // Trailing \ in pattern.
__Regex_InvalidNumber, // Number in \digit invalid or in error.
__Regex_MismatchingBracket, // [ ] imbalance.
__Regex_MismatchingParen, // ( ) imbalance.
__Regex_MismatchingBrace, // { } imbalance.
__Regex_InvalidBraceContent, // Content of {} invalid: not a number, number too large, more than two numbers, first larger than second.
__Regex_InvalidBracketContent, // Content of [] invalid.
__Regex_InvalidRange, // Invalid endpoint in range expression.
__Regex_InvalidRepetitionMarker, // ?, * or + not preceded by valid regular expression.
__Regex_ReachedMaxRecursion, // MaximumRecursion has been reached.
__Regex_EmptySubExpression, // Sub expression has empty content.
__Regex_InvalidCaptureGroup, // Content of capture group is invalid.
__Regex_InvalidNameForCaptureGroup, // Name of capture group is invalid.
__Regex_InvalidNameForProperty, // Name of property is invalid.
__Regex_DuplicateNamedCapture, // Duplicate named capture group
__Regex_InvalidCharacterClassEscape, // Invalid escaped entity in character class.
};
enum ReError {
REG_NOERR = __Regex_NoError,
REG_BADPAT = __Regex_InvalidPattern, // Invalid regular expression.
REG_ECOLLATE = __Regex_InvalidCollationElement, // Invalid collating element referenced.
REG_ECTYPE = __Regex_InvalidCharacterClass, // Invalid character class type referenced.
REG_EESCAPE = __Regex_InvalidTrailingEscape, // Trailing \ in pattern.
REG_ESUBREG = __Regex_InvalidNumber, // Number in \digit invalid or in error.
REG_EBRACK = __Regex_MismatchingBracket, // [ ] imbalance.
REG_EPAREN = __Regex_MismatchingParen, // \( \) or ( ) imbalance.
REG_EBRACE = __Regex_MismatchingBrace, // \{ \} imbalance.
REG_BADBR = __Regex_InvalidBraceContent, // Content of \{ \} invalid: not a number, number too large, more than two numbers, first larger than second.
REG_ERANGE = __Regex_InvalidRange, // Invalid endpoint in range expression.
REG_BADRPT = __Regex_InvalidRepetitionMarker, // ?, * or + not preceded by valid regular expression.
REG_EMPTY_EXPR = __Regex_EmptySubExpression, // Empty expression
REG_ENOSYS, // The implementation does not support the function.
REG_ESPACE, // Out of memory.
REG_NOMATCH, // regexec() failed to match.
};
typedef struct {
regoff_t rm_so; // byte offset from start of string to start of substring
regoff_t rm_eo; // byte offset from start of string of the first character after the end of substring
regoff_t rm_cnt; // number of matches
} regmatch_t;
enum __RegexAllFlags {
__Regex_Global = 1, // All matches (don't return after first match)
__Regex_Insensitive = __Regex_Global << 1, // Case insensitive match (ignores case of [a-zA-Z])
__Regex_Ungreedy = __Regex_Global << 2, // The match becomes lazy by default. Now a ? following a quantifier makes it greedy
__Regex_Unicode = __Regex_Global << 3, // Enable all unicode features and interpret all unicode escape sequences as such
__Regex_Extended = __Regex_Global << 4, // Ignore whitespaces. Spaces and text after a # in the pattern are ignored
__Regex_Extra = __Regex_Global << 5, // Disallow meaningless escapes. A \ followed by a letter with no special meaning is faulted
__Regex_MatchNotBeginOfLine = __Regex_Global << 6, // Pattern is not forced to ^ -> search in whole string!
__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
__Regex_SkipSubExprResults = __Regex_Global << 8, // Do not return sub expressions in the result
__Regex_StringCopyMatches = __Regex_Global << 9, // Do explicitly copy results into new allocated string instead of StringView to original string.
__Regex_SingleLine = __Regex_Global << 10, // Dot matches newline characters
__Regex_Sticky = __Regex_Global << 11, // Force the pattern to only match consecutive matches from where the previous match ended.
__Regex_Multiline = __Regex_Global << 12, // Handle newline characters. Match each line, one by one.
__Regex_SkipTrimEmptyMatches = __Regex_Global << 13, // Do not remove empty capture group results.
__Regex_SingleMatch = __Regex_Global << 14, // Stop after acquiring a single match.
__Regex_UnicodeSets = __Regex_Global << 15, // ECMA262 Parser specific: Allow set operations in char classes.
__Regex_Internal_Stateful = __Regex_Global << 16, // Internal flag; enables stateful matches.
__Regex_Internal_BrowserExtended = __Regex_Global << 17, // Internal flag; enable browser-specific ECMA262 extensions.
__Regex_Internal_ConsiderNewline = __Regex_Global << 18, // Internal flag; allow matchers to consider newlines as line separators.
__Regex_Last = __Regex_UnicodeSets,
};
// Values for the cflags parameter to the regcomp() function:
#define REG_EXTENDED __Regex_Extended // Use Extended Regular Expressions.
#define REG_ICASE __Regex_Insensitive // Ignore case in match.
#define REG_NOSUB __Regex_SkipSubExprResults // Report only success or fail in regexec().
#define REG_GLOBAL __Regex_Global // Don't stop searching for more match
#define REG_NEWLINE (__Regex_Multiline | REG_GLOBAL) // Change the handling of newline.
// Values for the eflags parameter to the regexec() function:
#define REG_NOTBOL __Regex_MatchNotBeginOfLine // The circumflex character (^), when taken as a special character, will not match the beginning of string.
#define REG_NOTEOL __Regex_MatchNotEndOfLine // The dollar sign ($), when taken as a special character, will not match the end of string.
#define REG_SEARCH __Regex_Last << 1
int regcomp(regex_t*, char const*, int);
int regexec(regex_t const*, char const*, size_t, regmatch_t[], int);
size_t regerror(int, regex_t const*, char*, size_t);
void regfree(regex_t*);
__END_DECLS
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