// Copyright (c) 2010, Google Inc.
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// Author: Sanjay Ghemawat
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#include <stdlib.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <limits.h> /* for SHRT_MIN, USHRT_MAX, etc */
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#include <string.h> /* for memcpy */
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#include <assert.h>
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#include <errno.h>
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#include <string>
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#include <algorithm>
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#include "pcrecpp_internal.h"
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#include "pcre2.h"
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#include "pcrecpp.h"
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#include "pcre_stringpiece.h"
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namespace pcrecpp {
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// If the user doesn't ask for any options, we just use this one
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static RE_Options default_options;
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void RE::Init(const string& pat, const RE_Options* options) {
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pattern_ = pat;
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if (options == NULL) {
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options_ = default_options;
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} else {
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options_ = *options;
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}
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error_ = "";
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re_full_ = NULL;
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re_partial_ = NULL;
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re_partial_ = Compile(UNANCHORED);
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if (re_partial_ != NULL) {
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re_full_ = Compile(ANCHOR_BOTH);
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}
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}
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void RE::Cleanup() {
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if (re_full_ != NULL) pcre2_code_free(re_full_);
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if (re_partial_ != NULL) pcre2_code_free(re_partial_);
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error_ = "";
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}
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RE::~RE() {
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Cleanup();
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}
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static void format_pcre_error(int error, string & str) {
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PCRE2_UCHAR8 buffer[256];
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auto rc = pcre2_get_error_message(error, buffer, 256);
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str.assign(reinterpret_cast<string::value_type*>(buffer));
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if (rc == PCRE2_ERROR_NOMEMORY) {
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str.append("...");
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}
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}
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pcre2_code* RE::Compile(Anchor anchor) {
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// First, convert RE_Options into pcre options
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int pcre_options = 0;
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pcre_options = options_.all_options();
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typedef std::unique_ptr<pcre2_compile_context,
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decltype(pcre2_compile_context_free)*> compile_context_ptr;
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compile_context_ptr compile_context(NULL, pcre2_compile_context_free);
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// As of pcre2 the newline mode must be passed through the compile context.
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// So we only need one if the newline mode is actually set.
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if (options_.newline_mode()) {
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compile_context = compile_context_ptr(pcre2_compile_context_create(NULL),
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pcre2_compile_context_free);
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if (!compile_context) {
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error_ = "Unable to allocate memory for pcre2_compile_congext";
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return NULL;
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}
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if (pcre2_set_newline(compile_context.get(),
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options_.newline_mode()) == PCRE2_ERROR_BADDATA) {
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error_ = "REOptions: bad newline mode given";
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return NULL;
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}
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}
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// Special treatment for anchoring. This is needed because at
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// runtime pcre only provides an option for anchoring at the
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// beginning of a string (unless you use offset).
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//
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// There are three types of anchoring we want:
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// UNANCHORED Compile the original pattern, and use
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// a pcre unanchored match.
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// ANCHOR_START Compile the original pattern, and use
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// a pcre anchored match.
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// ANCHOR_BOTH Tack a "\z" to the end of the original pattern
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// and use a pcre anchored match.
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int compile_error;
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PCRE2_SIZE eoffset;
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pcre2_code* re;
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if (anchor != ANCHOR_BOTH) {
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re = pcre2_compile(reinterpret_cast<PCRE2_SPTR>(pattern_.c_str()),
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pattern_.length(), pcre_options, &compile_error,
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&eoffset, compile_context.get());
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} else {
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// Tack a '\z' at the end of RE. Parenthesize it first so that
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// the '\z' applies to all top-level alternatives in the regexp.
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string wrapped = "(?:"; // A non-counting grouping operator
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wrapped += pattern_;
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wrapped += ")\\z";
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re = pcre2_compile(reinterpret_cast<PCRE2_SPTR>(wrapped.c_str()),
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wrapped.length(), pcre_options, &compile_error, &eoffset,
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compile_context.get());
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}
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if (re == NULL) {
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format_pcre_error(compile_error, error_);
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}
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return re;
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}
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/***** Matching interfaces *****/
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bool RE::Replace(const StringPiece& rewrite,
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string *str) const {
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pcre2_match_data_ptr match_data;
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int matches = TryMatch(*str, 0, UNANCHORED, true, match_data);
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if (matches == 0)
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return false;
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string s;
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if (!Rewrite(&s, rewrite, *str, match_data))
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return false;
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auto vec = pcre2_get_ovector_pointer(match_data.get());
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assert(vec[0] >= 0);
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assert(vec[1] >= 0);
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str->replace(vec[0], vec[1] - vec[0], s);
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return true;
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}
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static bool is_multi_char_newline_mode(int value) {
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switch (value) {
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case PCRE2_NEWLINE_CR:
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case PCRE2_NEWLINE_LF:
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return false;
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case PCRE2_NEWLINE_CRLF:
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case PCRE2_NEWLINE_ANY:
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case PCRE2_NEWLINE_ANYCRLF:
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return true;
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default:
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return false;
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}
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}
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int RE::GlobalReplace(const StringPiece& rewrite,
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string *str) const {
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int count = 0;
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string out;
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int start = 0;
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bool last_match_was_empty_string = false;
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pcre2_match_data_ptr match_data;
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while (start <= static_cast<int>(str->length())) {
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// If the previous match was for the empty string, we shouldn't
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// just match again: we'll match in the same way and get an
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// infinite loop. Instead, we do the match in a special way:
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// anchored -- to force another try at the same position --
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// and with a flag saying that this time, ignore empty matches.
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// If this special match returns, that means there's a non-empty
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// match at this position as well, and we can continue. If not,
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// we do what perl does, and just advance by one.
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// Notice that perl prints '@@@' for this;
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// perl -le '$_ = "aa"; s/b*|aa/@/g; print'
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int matches;
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if (last_match_was_empty_string) {
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matches = TryMatch(*str, start, ANCHOR_START, false, match_data);
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if (matches <= 0) {
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int matchend = start + 1; // advance one character.
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// If the current char is CR and we're in CRLF mode, skip LF too.
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// Note it's better to call pcre2_pattern_info() than to examine
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// all_options(), since options_ could have changed between
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// compile-time and now, but this is simpler and safe enough.
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// Modified by PH to add ANY and ANYCRLF.
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if (matchend < static_cast<int>(str->length()) &&
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(*str)[start] == '\r' && (*str)[matchend] == '\n' &&
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is_multi_char_newline_mode(options_.newline_mode())) {
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matchend++;
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}
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// We also need to advance more than one char if we're in utf8 mode.
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#ifdef SUPPORT_UTF8
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if (options_.utf8()) {
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while (matchend < static_cast<int>(str->length()) &&
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((*str)[matchend] & 0xc0) == 0x80)
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matchend++;
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}
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#endif
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if (start < static_cast<int>(str->length()))
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out.append(*str, start, matchend - start);
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start = matchend;
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last_match_was_empty_string = false;
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continue;
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}
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} else {
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matches = TryMatch(*str, start, UNANCHORED, true, match_data);
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if (matches <= 0)
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break;
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}
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auto vec = pcre2_get_ovector_pointer(match_data.get());
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int matchstart = vec[0], matchend = vec[1];
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assert(matchstart >= start);
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assert(matchend >= matchstart);
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out.append(*str, start, matchstart - start);
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Rewrite(&out, rewrite, *str, match_data);
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start = matchend;
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count++;
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last_match_was_empty_string = (matchstart == matchend);
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}
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if (count == 0)
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return 0;
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if (start < static_cast<int>(str->length()))
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out.append(*str, start, str->length() - start);
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swap(out, *str);
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return count;
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}
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bool RE::Extract(const StringPiece& rewrite,
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const StringPiece& text,
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string *out) const {
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pcre2_match_data_ptr match_data;
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int matches = TryMatch(text, 0, UNANCHORED, true, match_data);
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if (matches == 0)
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return false;
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out->erase();
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return Rewrite(out, rewrite, text, match_data);
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}
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/*static*/ string RE::QuoteMeta(const StringPiece& unquoted) {
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string result;
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// Escape any ascii character not in [A-Za-z_0-9].
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//
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// Note that it's legal to escape a character even if it has no
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// special meaning in a regular expression -- so this function does
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// that. (This also makes it identical to the perl function of the
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// same name; see `perldoc -f quotemeta`.) The one exception is
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// escaping NUL: rather than doing backslash + NUL, like perl does,
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// we do '\0', because pcre itself doesn't take embedded NUL chars.
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for (int ii = 0; ii < unquoted.size(); ++ii) {
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// Note that using 'isalnum' here raises the benchmark time from
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// 32ns to 58ns:
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if (unquoted[ii] == '\0') {
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result += "\\0";
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} else if ((unquoted[ii] < 'a' || unquoted[ii] > 'z') &&
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(unquoted[ii] < 'A' || unquoted[ii] > 'Z') &&
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(unquoted[ii] < '0' || unquoted[ii] > '9') &&
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unquoted[ii] != '_' &&
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// If this is the part of a UTF8 or Latin1 character, we need
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// to copy this byte without escaping. Experimentally this is
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// what works correctly with the regexp library.
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!(unquoted[ii] & 128)) {
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result += '\\';
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result += unquoted[ii];
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} else {
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result += unquoted[ii];
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}
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}
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return result;
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}
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/***** Actual matching and rewriting code *****/
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int RE::TryMatch(const StringPiece& text,
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int startpos,
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Anchor anchor,
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bool empty_ok,
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pcre2_match_data_ptr & match_data) const {
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typedef std::unique_ptr<pcre2_match_context,
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decltype(pcre2_match_context_free)*> match_context_ptr;
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pcre2_code* re = (anchor == ANCHOR_BOTH) ? re_full_ : re_partial_;
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if (re == NULL) {
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//fprintf(stderr, "Matching against invalid re: %s\n", error_->c_str());
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return 0;
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}
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match_context_ptr match_context = match_context_ptr(
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pcre2_match_context_create(NULL),
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pcre2_match_context_free);
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if (!match_context)
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return 0;
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if (options_.match_limit() > 0) {
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pcre2_set_match_limit(match_context.get(), options_.match_limit());
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}
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if (options_.match_limit_recursion() > 0) {
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pcre2_set_recursion_limit(match_context.get(),
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options_.match_limit_recursion());
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}
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match_data = pcre2_match_data_ptr(
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pcre2_match_data_create_from_pattern(re, NULL),
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pcre2_match_data_free);
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if (!match_data) {
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return 0;
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}
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// int options = 0;
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// Changed by PH as a result of bugzilla #1288
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int options = (options_.all_options() & PCRE2_NO_UTF_CHECK);
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if (anchor != UNANCHORED)
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options |= PCRE2_ANCHORED;
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if (!empty_ok)
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options |= PCRE2_NOTEMPTY;
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int rc = pcre2_match(
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re, reinterpret_cast<PCRE2_SPTR>((text.empty()) ? "" : text.data()),
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text.size(), startpos, options, match_data.get(), match_context.get());
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// Handle errors
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if (rc == PCRE2_ERROR_NOMATCH) {
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return 0;
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}
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if (rc == PCRE2_ERROR_PARTIAL) {
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// not sure what to do with partial yet
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return 0;
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} else if (rc < 0) {
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// For any other error condition also return 0.
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return 0;
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}
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return rc; // return number of matches found
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}
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bool RE::DoMatchImpl(const StringPiece& text,
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Anchor anchor,
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int* consumed,
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const Arg* args,
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int n) const {
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pcre2_match_data_ptr match_data;
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int matches = TryMatch(text, 0, anchor, true, match_data);
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assert(matches >= 0); // TryMatch never returns negatives
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if (matches == 0)
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return false;
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auto vec = pcre2_get_ovector_pointer(match_data.get());
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// allow for NULL
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if (consumed != NULL)
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*consumed = vec[1];
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if (n == 0 || args == NULL) {
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// We are not interested in results
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return true;
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}
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if (NumberOfCapturingGroups() < n) {
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// RE has fewer capturing groups than number of arg pointers passed in
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return false;
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}
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// If we got here, we must have matched the whole pattern.
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// We do not need (can not do) any more checks on the value of 'matches' here
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// -- see the comment for TryMatch.
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for (int i = 0; i < n; i++) {
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const int start = vec[2*(i+1)];
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const int limit = vec[2*(i+1)+1];
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if (!args[i].Parse(text.data() + start, limit - start)) {
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// TODO: Should we indicate what the error was?
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return false;
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}
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}
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return true;
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}
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bool RE::DoMatch(const StringPiece& text,
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Anchor anchor,
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int* consumed,
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Arg const args[],
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int n) const {
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assert(n >= 0);
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bool retval = DoMatchImpl(text, anchor, consumed, args, n);
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return retval;
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}
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bool RE::Rewrite(string *out, const StringPiece &rewrite,
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const StringPiece &text,
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pcre2_match_data_ptr const & match_data) const {
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auto veclen = pcre2_get_ovector_count(match_data.get());
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auto vec = pcre2_get_ovector_pointer(match_data.get());
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for (const char *s = rewrite.data(), *end = s + rewrite.size();
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s < end; s++) {
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int c = *s;
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if (c == '\\') {
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c = *++s;
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if (isdigit(c)) {
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decltype(veclen) n = (c - '0');
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if (n >= veclen) {
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//fprintf(stderr, requested group %d in regexp %.*s\n",
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// n, rewrite.size(), rewrite.data());
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return false;
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}
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int start = vec[2 * n];
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if (start >= 0)
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out->append(text.data() + start, vec[2 * n + 1] - start);
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} else if (c == '\\') {
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*out += '\\';
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} else {
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//fprintf(stderr, "invalid rewrite pattern: %.*s\n",
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// rewrite.size(), rewrite.data());
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return false;
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}
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} else {
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*out += c;
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}
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}
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return true;
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}
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// Return the number of capturing subpatterns, or -1 if the
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// regexp wasn't valid on construction.
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int RE::NumberOfCapturingGroups() const {
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if (re_partial_ == NULL) return -1;
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int result;
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int pcre_retval = pcre2_pattern_info(re_partial_, PCRE2_INFO_CAPTURECOUNT,
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&result);
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assert(pcre_retval == 0);
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return result;
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}
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/***** Parsers for various types *****/
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bool Arg::parse_null(const char* str, int n, void* dest) {
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(void)str;
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(void)n;
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// We fail if somebody asked us to store into a non-NULL void* pointer
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return (dest == NULL);
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}
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bool Arg::parse_string(const char* str, int n, void* dest) {
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if (dest == NULL) return true;
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reinterpret_cast<string*>(dest)->assign(str, n);
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return true;
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}
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bool Arg::parse_stringpiece(const char* str, int n, void* dest) {
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if (dest == NULL) return true;
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reinterpret_cast<StringPiece*>(dest)->set(str, n);
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return true;
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}
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bool Arg::parse_char(const char* str, int n, void* dest) {
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if (n != 1) return false;
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if (dest == NULL) return true;
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*(reinterpret_cast<char*>(dest)) = str[0];
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return true;
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}
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bool Arg::parse_uchar(const char* str, int n, void* dest) {
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if (n != 1) return false;
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if (dest == NULL) return true;
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*(reinterpret_cast<unsigned char*>(dest)) = str[0];
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return true;
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}
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// Largest number spec that we are willing to parse
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static const int kMaxNumberLength = 32;
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// REQUIRES "buf" must have length at least kMaxNumberLength+1
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// REQUIRES "n > 0"
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// Copies "str" into "buf" and null-terminates if necessary.
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// Returns one of:
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// a. "str" if no termination is needed
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// b. "buf" if the string was copied and null-terminated
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// c. "" if the input was invalid and has no hope of being parsed
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static const char* TerminateNumber(char* buf, const char* str, int n) {
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if ((n > 0) && isspace(*str)) {
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// We are less forgiving than the strtoxxx() routines and do not
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// allow leading spaces.
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return "";
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}
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// See if the character right after the input text may potentially
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// look like a digit.
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if (isdigit(str[n]) ||
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((str[n] >= 'a') && (str[n] <= 'f')) ||
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((str[n] >= 'A') && (str[n] <= 'F'))) {
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if (n > kMaxNumberLength) return ""; // Input too big to be a valid number
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memcpy(buf, str, n);
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buf[n] = '\0';
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return buf;
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} else {
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// We can parse right out of the supplied string, so return it.
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return str;
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}
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}
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bool Arg::parse_long_radix(const char* str,
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int n,
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void* dest,
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int radix) {
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if (n == 0) return false;
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char buf[kMaxNumberLength+1];
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str = TerminateNumber(buf, str, n);
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char* end;
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errno = 0;
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long r = strtol(str, &end, radix);
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if (end != str + n) return false; // Leftover junk
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if (errno) return false;
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if (dest == NULL) return true;
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*(reinterpret_cast<long*>(dest)) = r;
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return true;
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}
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bool Arg::parse_ulong_radix(const char* str,
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int n,
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void* dest,
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int radix) {
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if (n == 0) return false;
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char buf[kMaxNumberLength+1];
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str = TerminateNumber(buf, str, n);
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if (str[0] == '-') return false; // strtoul() on a negative number?!
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char* end;
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errno = 0;
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unsigned long r = strtoul(str, &end, radix);
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if (end != str + n) return false; // Leftover junk
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if (errno) return false;
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if (dest == NULL) return true;
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*(reinterpret_cast<unsigned long*>(dest)) = r;
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return true;
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}
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bool Arg::parse_short_radix(const char* str,
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int n,
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void* dest,
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int radix) {
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long r;
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if (!parse_long_radix(str, n, &r, radix)) return false; // Could not parse
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if (r < SHRT_MIN || r > SHRT_MAX) return false; // Out of range
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if (dest == NULL) return true;
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*(reinterpret_cast<short*>(dest)) = static_cast<short>(r);
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return true;
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}
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bool Arg::parse_ushort_radix(const char* str,
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int n,
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void* dest,
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int radix) {
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unsigned long r;
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if (!parse_ulong_radix(str, n, &r, radix)) return false; // Could not parse
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if (r > USHRT_MAX) return false; // Out of range
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if (dest == NULL) return true;
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*(reinterpret_cast<unsigned short*>(dest)) = static_cast<unsigned short>(r);
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return true;
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}
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bool Arg::parse_int_radix(const char* str,
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int n,
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void* dest,
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int radix) {
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long r;
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if (!parse_long_radix(str, n, &r, radix)) return false; // Could not parse
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if (r < INT_MIN || r > INT_MAX) return false; // Out of range
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if (dest == NULL) return true;
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*(reinterpret_cast<int*>(dest)) = r;
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return true;
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}
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bool Arg::parse_uint_radix(const char* str,
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int n,
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void* dest,
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int radix) {
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unsigned long r;
|
if (!parse_ulong_radix(str, n, &r, radix)) return false; // Could not parse
|
if (r > UINT_MAX) return false; // Out of range
|
if (dest == NULL) return true;
|
*(reinterpret_cast<unsigned int*>(dest)) = r;
|
return true;
|
}
|
|
bool Arg::parse_longlong_radix(const char* str,
|
int n,
|
void* dest,
|
int radix) {
|
#ifndef HAVE_LONG_LONG
|
return false;
|
#else
|
if (n == 0) return false;
|
char buf[kMaxNumberLength+1];
|
str = TerminateNumber(buf, str, n);
|
char* end;
|
errno = 0;
|
#if defined HAVE_STRTOQ
|
long long r = strtoq(str, &end, radix);
|
#elif defined HAVE_STRTOLL
|
long long r = strtoll(str, &end, radix);
|
#elif defined HAVE__STRTOI64
|
long long r = _strtoi64(str, &end, radix);
|
#elif defined HAVE_STRTOIMAX
|
long long r = strtoimax(str, &end, radix);
|
#else
|
#error parse_longlong_radix: cannot convert input to a long-long
|
#endif
|
if (end != str + n) return false; // Leftover junk
|
if (errno) return false;
|
if (dest == NULL) return true;
|
*(reinterpret_cast<long long*>(dest)) = r;
|
return true;
|
#endif /* HAVE_LONG_LONG */
|
}
|
|
bool Arg::parse_ulonglong_radix(const char* str,
|
int n,
|
void* dest,
|
int radix) {
|
#ifndef HAVE_UNSIGNED_LONG_LONG
|
return false;
|
#else
|
if (n == 0) return false;
|
char buf[kMaxNumberLength+1];
|
str = TerminateNumber(buf, str, n);
|
if (str[0] == '-') return false; // strtoull() on a negative number?!
|
char* end;
|
errno = 0;
|
#if defined HAVE_STRTOQ
|
unsigned long long r = strtouq(str, &end, radix);
|
#elif defined HAVE_STRTOLL
|
unsigned long long r = strtoull(str, &end, radix);
|
#elif defined HAVE__STRTOI64
|
unsigned long long r = _strtoui64(str, &end, radix);
|
#elif defined HAVE_STRTOIMAX
|
unsigned long long r = strtoumax(str, &end, radix);
|
#else
|
#error parse_ulonglong_radix: cannot convert input to a long-long
|
#endif
|
if (end != str + n) return false; // Leftover junk
|
if (errno) return false;
|
if (dest == NULL) return true;
|
*(reinterpret_cast<unsigned long long*>(dest)) = r;
|
return true;
|
#endif /* HAVE_UNSIGNED_LONG_LONG */
|
}
|
|
bool Arg::parse_double(const char* str, int n, void* dest) {
|
if (n == 0) return false;
|
static const int kMaxLength = 200;
|
char buf[kMaxLength];
|
if (n >= kMaxLength) return false;
|
memcpy(buf, str, n);
|
buf[n] = '\0';
|
errno = 0;
|
char* end;
|
double r = strtod(buf, &end);
|
if (end != buf + n) return false; // Leftover junk
|
if (errno) return false;
|
if (dest == NULL) return true;
|
*(reinterpret_cast<double*>(dest)) = r;
|
return true;
|
}
|
|
bool Arg::parse_float(const char* str, int n, void* dest) {
|
double r;
|
if (!parse_double(str, n, &r)) return false;
|
if (dest == NULL) return true;
|
*(reinterpret_cast<float*>(dest)) = static_cast<float>(r);
|
return true;
|
}
|
|
|
#define DEFINE_INTEGER_PARSERS(name) \
|
bool Arg::parse_##name(const char* str, int n, void* dest) { \
|
return parse_##name##_radix(str, n, dest, 10); \
|
} \
|
bool Arg::parse_##name##_hex(const char* str, int n, void* dest) { \
|
return parse_##name##_radix(str, n, dest, 16); \
|
} \
|
bool Arg::parse_##name##_octal(const char* str, int n, void* dest) { \
|
return parse_##name##_radix(str, n, dest, 8); \
|
} \
|
bool Arg::parse_##name##_cradix(const char* str, int n, void* dest) { \
|
return parse_##name##_radix(str, n, dest, 0); \
|
}
|
|
DEFINE_INTEGER_PARSERS(short) /* */
|
DEFINE_INTEGER_PARSERS(ushort) /* */
|
DEFINE_INTEGER_PARSERS(int) /* Don't use semicolons after these */
|
DEFINE_INTEGER_PARSERS(uint) /* statements because they can cause */
|
DEFINE_INTEGER_PARSERS(long) /* compiler warnings if the checking */
|
DEFINE_INTEGER_PARSERS(ulong) /* level is turned up high enough. */
|
DEFINE_INTEGER_PARSERS(longlong) /* */
|
DEFINE_INTEGER_PARSERS(ulonglong) /* */
|
|
#undef DEFINE_INTEGER_PARSERS
|
|
} // namespace pcrecpp
|
