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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/strings/string_split.h"
#include "base/logging.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "base/third_party/icu/icu_utf.h"
namespace base {
namespace {
template <typename STR>
void SplitStringT(const STR& str,
const typename STR::value_type s,
bool trim_whitespace,
std::vector<STR>* r) {
r->clear();
size_t last = 0;
size_t c = str.size();
for (size_t i = 0; i <= c; ++i) {
if (i == c || str[i] == s) {
STR tmp(str, last, i - last);
if (trim_whitespace)
TrimWhitespace(tmp, TRIM_ALL, &tmp);
// Avoid converting an empty or all-whitespace source string into a vector
// of one empty string.
if (i != c || !r->empty() || !tmp.empty())
r->push_back(tmp);
last = i + 1;
}
}
}
bool SplitStringIntoKeyValue(const std::string& line,
char key_value_delimiter,
std::string* key,
std::string* value) {
key->clear();
value->clear();
// Find the delimiter.
size_t end_key_pos = line.find_first_of(key_value_delimiter);
if (end_key_pos == std::string::npos) {
DVLOG(1) << "cannot find delimiter in: " << line;
return false; // no delimiter
}
key->assign(line, 0, end_key_pos);
// Find the value string.
std::string remains(line, end_key_pos, line.size() - end_key_pos);
size_t begin_value_pos = remains.find_first_not_of(key_value_delimiter);
if (begin_value_pos == std::string::npos) {
DVLOG(1) << "cannot parse value from line: " << line;
return false; // no value
}
value->assign(remains, begin_value_pos, remains.size() - begin_value_pos);
return true;
}
template <typename STR>
void SplitStringUsingSubstrT(const STR& str,
const STR& s,
std::vector<STR>* r) {
r->clear();
typename STR::size_type begin_index = 0;
while (true) {
const typename STR::size_type end_index = str.find(s, begin_index);
if (end_index == STR::npos) {
const STR term = str.substr(begin_index);
STR tmp;
TrimWhitespace(term, TRIM_ALL, &tmp);
r->push_back(tmp);
return;
}
const STR term = str.substr(begin_index, end_index - begin_index);
STR tmp;
TrimWhitespace(term, TRIM_ALL, &tmp);
r->push_back(tmp);
begin_index = end_index + s.size();
}
}
template<typename STR>
void SplitStringAlongWhitespaceT(const STR& str, std::vector<STR>* result) {
result->clear();
const size_t length = str.length();
if (!length)
return;
bool last_was_ws = false;
size_t last_non_ws_start = 0;
for (size_t i = 0; i < length; ++i) {
switch (str[i]) {
// HTML 5 defines whitespace as: space, tab, LF, line tab, FF, or CR.
case L' ':
case L'\t':
case L'\xA':
case L'\xB':
case L'\xC':
case L'\xD':
if (!last_was_ws) {
if (i > 0) {
result->push_back(
str.substr(last_non_ws_start, i - last_non_ws_start));
}
last_was_ws = true;
}
break;
default: // Not a space character.
if (last_was_ws) {
last_was_ws = false;
last_non_ws_start = i;
}
break;
}
}
if (!last_was_ws) {
result->push_back(
str.substr(last_non_ws_start, length - last_non_ws_start));
}
}
} // namespace
void SplitString(const string16& str,
char16 c,
std::vector<string16>* r) {
DCHECK(CBU16_IS_SINGLE(c));
SplitStringT(str, c, true, r);
}
void SplitString(const std::string& str,
char c,
std::vector<std::string>* r) {
#if CHAR_MIN < 0
DCHECK(c >= 0);
#endif
DCHECK(c < 0x7F);
SplitStringT(str, c, true, r);
}
bool SplitStringIntoKeyValuePairs(const std::string& line,
char key_value_delimiter,
char key_value_pair_delimiter,
StringPairs* key_value_pairs) {
key_value_pairs->clear();
std::vector<std::string> pairs;
SplitString(line, key_value_pair_delimiter, &pairs);
bool success = true;
for (size_t i = 0; i < pairs.size(); ++i) {
// Don't add empty pairs into the result.
if (pairs[i].empty())
continue;
std::string key;
std::string value;
if (!SplitStringIntoKeyValue(pairs[i], key_value_delimiter, &key, &value)) {
// Don't return here, to allow for pairs without associated
// value or key; just record that the split failed.
success = false;
}
key_value_pairs->push_back(make_pair(key, value));
}
return success;
}
void SplitStringUsingSubstr(const string16& str,
const string16& s,
std::vector<string16>* r) {
SplitStringUsingSubstrT(str, s, r);
}
void SplitStringUsingSubstr(const std::string& str,
const std::string& s,
std::vector<std::string>* r) {
SplitStringUsingSubstrT(str, s, r);
}
void SplitStringDontTrim(const string16& str,
char16 c,
std::vector<string16>* r) {
DCHECK(CBU16_IS_SINGLE(c));
SplitStringT(str, c, false, r);
}
void SplitStringDontTrim(const std::string& str,
char c,
std::vector<std::string>* r) {
DCHECK(IsStringUTF8(str));
#if CHAR_MIN < 0
DCHECK(c >= 0);
#endif
DCHECK(c < 0x7F);
SplitStringT(str, c, false, r);
}
void SplitStringAlongWhitespace(const string16& str,
std::vector<string16>* result) {
SplitStringAlongWhitespaceT(str, result);
}
void SplitStringAlongWhitespace(const std::string& str,
std::vector<std::string>* result) {
SplitStringAlongWhitespaceT(str, result);
}
} // namespace base
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