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/*
* Copyright (c) 2020, Emanuel Sprung <emanuel.sprung@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/String.h>
#include <AK/StringBuilder.h>
#include <LibRegex/Regex.h>
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#ifdef __serenity__
# include <regex.h>
#else
# include <LibC/regex.h>
#endif
struct internal_regex_t {
u8 cflags;
u8 eflags;
OwnPtr<Regex<PosixExtended>> re;
size_t re_pat_errpos;
ReError re_pat_err;
String re_pat;
size_t re_nsub;
};
static internal_regex_t* impl_from(regex_t* re)
{
if (!re)
return nullptr;
return reinterpret_cast<internal_regex_t*>(re->__data);
}
static const internal_regex_t* impl_from(const regex_t* re)
{
return impl_from(const_cast<regex_t*>(re));
}
extern "C" {
int regcomp(regex_t* reg, const char* pattern, int cflags)
{
if (!reg)
return REG_ESPACE;
// Note that subsequent uses of regcomp() without regfree() _will_ leak memory
// This could've been prevented if libc provided a reginit() or similar, but it does not.
reg->__data = new internal_regex_t { 0, 0, {}, 0, ReError::REG_NOERR, {}, 0 };
auto preg = impl_from(reg);
if (!(cflags & REG_EXTENDED))
return REG_ENOSYS;
preg->cflags = cflags;
String pattern_str(pattern);
preg->re = make<Regex<PosixExtended>>(pattern_str, PosixOptions {} | (PosixFlags)cflags | PosixFlags::SkipTrimEmptyMatches);
auto parser_result = preg->re->parser_result;
if (parser_result.error != regex::Error::NoError) {
preg->re_pat_errpos = parser_result.error_token.position();
preg->re_pat_err = (ReError)parser_result.error;
preg->re_pat = pattern;
dbgln("Have Error: {}", (int)parser_result.error);
return (ReError)parser_result.error;
}
preg->re_nsub = parser_result.capture_groups_count;
return REG_NOERR;
}
int regexec(const regex_t* reg, const char* string, size_t nmatch, regmatch_t pmatch[], int eflags)
{
auto preg = impl_from(reg);
if (!preg->re || preg->re_pat_err) {
if (preg->re_pat_err)
return preg->re_pat_err;
return REG_BADPAT;
}
RegexResult result;
if (eflags & REG_SEARCH)
result = preg->re->search(string, PosixOptions {} | (PosixFlags)eflags);
else
result = preg->re->match(string, PosixOptions {} | (PosixFlags)eflags);
if (result.success) {
auto size = result.matches.size();
if (size && nmatch && pmatch) {
pmatch[0].rm_cnt = size;
size_t match_index { 0 };
for (size_t i = 0; i < size; ++i) {
pmatch[match_index].rm_so = result.matches.at(i).global_offset;
pmatch[match_index].rm_eo = pmatch[match_index].rm_so + result.matches.at(i).view.length();
if (match_index > 0)
pmatch[match_index].rm_cnt = result.capture_group_matches.size();
++match_index;
if (match_index >= nmatch)
return REG_NOERR;
if (i < result.capture_group_matches.size()) {
auto capture_groups_size = result.capture_group_matches.at(i).size();
for (size_t j = 0; j < preg->re->parser_result.capture_groups_count; ++j) {
if (j >= capture_groups_size || !result.capture_group_matches.at(i).at(j).view.length()) {
pmatch[match_index].rm_so = -1;
pmatch[match_index].rm_eo = -1;
pmatch[match_index].rm_cnt = 0;
} else {
pmatch[match_index].rm_so = result.capture_group_matches.at(i).at(j).global_offset;
pmatch[match_index].rm_eo = pmatch[match_index].rm_so + result.capture_group_matches.at(i).at(j).view.length();
pmatch[match_index].rm_cnt = 1;
}
++match_index;
if (match_index >= nmatch)
return REG_NOERR;
}
}
}
if (match_index < nmatch) {
for (size_t i = match_index; i < nmatch; ++i) {
pmatch[i].rm_so = -1;
pmatch[i].rm_eo = -1;
pmatch[i].rm_cnt = 0;
}
}
}
return REG_NOERR;
} else {
if (nmatch && pmatch) {
pmatch[0].rm_so = -1;
pmatch[0].rm_eo = -1;
pmatch[0].rm_cnt = 0;
}
}
return REG_NOMATCH;
}
inline static String get_error(ReError errcode)
{
String error;
switch ((ReError)errcode) {
case REG_NOERR:
error = "No error";
break;
case REG_NOMATCH:
error = "regexec() failed to match.";
break;
case REG_BADPAT:
error = "Invalid regular expression.";
break;
case REG_ECOLLATE:
error = "Invalid collating element referenced.";
break;
case REG_ECTYPE:
error = "Invalid character class type referenced.";
break;
case REG_EESCAPE:
error = "Trailing \\ in pattern.";
break;
case REG_ESUBREG:
error = "Number in \\digit invalid or in error.";
break;
case REG_EBRACK:
error = "[ ] imbalance.";
break;
case REG_EPAREN:
error = "\\( \\) or ( ) imbalance.";
break;
case REG_EBRACE:
error = "\\{ \\} imbalance.";
break;
case REG_BADBR:
error = "Content of \\{ \\} invalid: not a number, number too large, more than two numbers, first larger than second.";
break;
case REG_ERANGE:
error = "Invalid endpoint in range expression.";
break;
case REG_ESPACE:
error = "Out of memory.";
break;
case REG_BADRPT:
error = "?, * or + not preceded by valid regular expression.";
break;
case REG_ENOSYS:
error = "The implementation does not support the function.";
break;
case REG_EMPTY_EXPR:
error = "Empty expression provided";
break;
}
return error;
}
size_t regerror(int errcode, const regex_t* reg, char* errbuf, size_t errbuf_size)
{
String error;
auto preg = impl_from(reg);
if (!preg)
error = get_error((ReError)errcode);
else
error = preg->re->error_string(get_error(preg->re_pat_err));
if (!errbuf_size)
return error.length();
if (!error.copy_characters_to_buffer(errbuf, errbuf_size))
return 0;
return error.length();
}
void regfree(regex_t* reg)
{
auto preg = impl_from(reg);
if (preg) {
delete preg;
reg->__data = nullptr;
}
}
}
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