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-rw-r--r--absl/strings/strip.cc268
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diff --git a/absl/strings/strip.cc b/absl/strings/strip.cc
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--- a/absl/strings/strip.cc
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-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-// This file contains functions that remove a defined part from the std::string,
-// i.e., strip the std::string.
-
-#include "absl/strings/strip.h"
-
-#include <algorithm>
-#include <cstring>
-#include <string>
-
-#include "absl/strings/ascii.h"
-#include "absl/strings/string_view.h"
-
-// ----------------------------------------------------------------------
-// ReplaceCharacters
-// Replaces any occurrence of the character 'remove' (or the characters
-// in 'remove') with the character 'replace_with'.
-// ----------------------------------------------------------------------
-void ReplaceCharacters(char* str, size_t len, absl::string_view remove,
- char replace_with) {
- for (char* end = str + len; str != end; ++str) {
- if (remove.find(*str) != absl::string_view::npos) {
- *str = replace_with;
- }
- }
-}
-
-void ReplaceCharacters(std::string* s, absl::string_view remove, char replace_with) {
- for (char& ch : *s) {
- if (remove.find(ch) != absl::string_view::npos) {
- ch = replace_with;
- }
- }
-}
-
-bool StripTrailingNewline(std::string* s) {
- if (!s->empty() && (*s)[s->size() - 1] == '\n') {
- if (s->size() > 1 && (*s)[s->size() - 2] == '\r')
- s->resize(s->size() - 2);
- else
- s->resize(s->size() - 1);
- return true;
- }
- return false;
-}
-
-// ----------------------------------------------------------------------
-// Misc. stripping routines
-// ----------------------------------------------------------------------
-void StripCurlyBraces(std::string* s) {
- return StripBrackets('{', '}', s);
-}
-
-void StripBrackets(char left, char right, std::string* s) {
- std::string::iterator opencurly = std::find(s->begin(), s->end(), left);
- while (opencurly != s->end()) {
- std::string::iterator closecurly = std::find(opencurly, s->end(), right);
- if (closecurly == s->end()) return;
- opencurly = s->erase(opencurly, closecurly + 1);
- opencurly = std::find(opencurly, s->end(), left);
- }
-}
-
-void StripMarkupTags(std::string* s) {
- std::string::iterator output = std::find(s->begin(), s->end(), '<');
- std::string::iterator input = output;
- while (input != s->end()) {
- if (*input == '<') {
- input = std::find(input, s->end(), '>');
- if (input == s->end()) break;
- ++input;
- } else {
- *output++ = *input++;
- }
- }
- s->resize(output - s->begin());
-}
-
-std::string OutputWithMarkupTagsStripped(const std::string& s) {
- std::string result(s);
- StripMarkupTags(&result);
- return result;
-}
-
-ptrdiff_t TrimStringLeft(std::string* s, absl::string_view remove) {
- size_t i = 0;
- while (i < s->size() && memchr(remove.data(), (*s)[i], remove.size())) {
- ++i;
- }
- if (i > 0) s->erase(0, i);
- return i;
-}
-
-ptrdiff_t TrimStringRight(std::string* s, absl::string_view remove) {
- size_t i = s->size(), trimmed = 0;
- while (i > 0 && memchr(remove.data(), (*s)[i - 1], remove.size())) {
- --i;
- }
- if (i < s->size()) {
- trimmed = s->size() - i;
- s->erase(i);
- }
- return trimmed;
-}
-
-// Unfortunately, absl::string_view does not have erase, so we've to replicate
-// the implementation with remove_prefix()/remove_suffix()
-ptrdiff_t TrimStringLeft(absl::string_view* s, absl::string_view remove) {
- size_t i = 0;
- while (i < s->size() && memchr(remove.data(), (*s)[i], remove.size())) {
- ++i;
- }
- if (i > 0) s->remove_prefix(i);
- return i;
-}
-
-ptrdiff_t TrimStringRight(absl::string_view* s, absl::string_view remove) {
- size_t i = s->size(), trimmed = 0;
- while (i > 0 && memchr(remove.data(), (*s)[i - 1], remove.size())) {
- --i;
- }
- if (i < s->size()) {
- trimmed = s->size() - i;
- s->remove_suffix(trimmed);
- }
- return trimmed;
-}
-
-// ----------------------------------------------------------------------
-// Various removal routines
-// ----------------------------------------------------------------------
-ptrdiff_t strrm(char* str, char c) {
- char* src;
- char* dest;
- for (src = dest = str; *src != '\0'; ++src)
- if (*src != c) *(dest++) = *src;
- *dest = '\0';
- return dest - str;
-}
-
-ptrdiff_t memrm(char* str, ptrdiff_t strlen, char c) {
- char* src;
- char* dest;
- for (src = dest = str; strlen-- > 0; ++src)
- if (*src != c) *(dest++) = *src;
- return dest - str;
-}
-
-ptrdiff_t strrmm(char* str, const char* chars) {
- char* src;
- char* dest;
- for (src = dest = str; *src != '\0'; ++src) {
- bool skip = false;
- for (const char* c = chars; *c != '\0'; c++) {
- if (*src == *c) {
- skip = true;
- break;
- }
- }
- if (!skip) *(dest++) = *src;
- }
- *dest = '\0';
- return dest - str;
-}
-
-ptrdiff_t strrmm(std::string* str, const std::string& chars) {
- size_t str_len = str->length();
- size_t in_index = str->find_first_of(chars);
- if (in_index == std::string::npos) return str_len;
-
- size_t out_index = in_index++;
-
- while (in_index < str_len) {
- char c = (*str)[in_index++];
- if (chars.find(c) == std::string::npos) (*str)[out_index++] = c;
- }
-
- str->resize(out_index);
- return out_index;
-}
-
-// ----------------------------------------------------------------------
-// StripDupCharacters
-// Replaces any repeated occurrence of the character 'dup_char'
-// with single occurrence. e.g.,
-// StripDupCharacters("a//b/c//d", '/', 0) => "a/b/c/d"
-// Return the number of characters removed
-// ----------------------------------------------------------------------
-ptrdiff_t StripDupCharacters(std::string* s, char dup_char, ptrdiff_t start_pos) {
- if (start_pos < 0) start_pos = 0;
-
- // remove dups by compaction in-place
- ptrdiff_t input_pos = start_pos; // current reader position
- ptrdiff_t output_pos = start_pos; // current writer position
- const ptrdiff_t input_end = s->size();
- while (input_pos < input_end) {
- // keep current character
- const char curr_char = (*s)[input_pos];
- if (output_pos != input_pos) // must copy
- (*s)[output_pos] = curr_char;
- ++input_pos;
- ++output_pos;
-
- if (curr_char == dup_char) { // skip subsequent dups
- while ((input_pos < input_end) && ((*s)[input_pos] == dup_char))
- ++input_pos;
- }
- }
- const ptrdiff_t num_deleted = input_pos - output_pos;
- s->resize(s->size() - num_deleted);
- return num_deleted;
-}
-
-// ----------------------------------------------------------------------
-// TrimRunsInString
-// Removes leading and trailing runs, and collapses middle
-// runs of a set of characters into a single character (the
-// first one specified in 'remove'). Useful for collapsing
-// runs of repeated delimiters, whitespace, etc. E.g.,
-// TrimRunsInString(&s, " :,()") removes leading and trailing
-// delimiter chars and collapses and converts internal runs
-// of delimiters to single ' ' characters, so, for example,
-// " a:(b):c " -> "a b c"
-// "first,last::(area)phone, ::zip" -> "first last area phone zip"
-// ----------------------------------------------------------------------
-void TrimRunsInString(std::string* s, absl::string_view remove) {
- std::string::iterator dest = s->begin();
- std::string::iterator src_end = s->end();
- for (std::string::iterator src = s->begin(); src != src_end;) {
- if (remove.find(*src) == absl::string_view::npos) {
- *(dest++) = *(src++);
- } else {
- // Skip to the end of this run of chars that are in 'remove'.
- for (++src; src != src_end; ++src) {
- if (remove.find(*src) == absl::string_view::npos) {
- if (dest != s->begin()) {
- // This is an internal run; collapse it.
- *(dest++) = remove[0];
- }
- *(dest++) = *(src++);
- break;
- }
- }
- }
- }
- s->erase(dest, src_end);
-}
-
-// ----------------------------------------------------------------------
-// RemoveNullsInString
-// Removes any internal \0 characters from the std::string.
-// ----------------------------------------------------------------------
-void RemoveNullsInString(std::string* s) {
- s->erase(std::remove(s->begin(), s->end(), '\0'), s->end());
-}
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