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// Copyright 2012 The Chromium Authors
// 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 <stddef.h>
#include <string_view>
#include "base/logging.h"
#include "base/strings/string_split_internal.h"
#include "base/strings/string_util.h"
#include "base/third_party/icu/icu_utf.h"
namespace base {
namespace {
// Helper for the various *SplitStringOnce implementations. When returning a
// pair of `std::string_view`, does not include the character at `position`.
std::optional<std::pair<std::string_view, std::string_view>>
SplitStringAtExclusive(std::string_view input, size_t position) {
if (position == std::string_view::npos) {
return std::nullopt;
}
return std::pair(input.substr(0, position), input.substr(position + 1));
}
bool AppendStringViewKeyValue(std::string_view input,
char delimiter,
StringViewPairs* result) {
// Always append a new item regardless of success (it might be empty). The
// below code will copy the strings directly into the result pair.
result->resize(result->size() + 1);
auto& result_pair = result->back();
// Find the delimiter.
size_t end_key_pos = input.find_first_of(delimiter);
if (end_key_pos == std::string::npos) {
DVLOG(1) << "cannot find delimiter in: " << input;
return false; // No delimiter.
}
result_pair.first = input.substr(0, end_key_pos);
// Find the value string.
std::string_view remains =
input.substr(end_key_pos, input.size() - end_key_pos);
size_t begin_value_pos = remains.find_first_not_of(delimiter);
if (begin_value_pos == std::string_view::npos) {
DVLOG(1) << "cannot parse value from input: " << input;
return false; // No value.
}
result_pair.second =
remains.substr(begin_value_pos, remains.size() - begin_value_pos);
return true;
}
} // namespace
std::optional<std::pair<std::string_view, std::string_view>> SplitStringOnce(
std::string_view input,
char separator) {
return SplitStringAtExclusive(input, input.find(separator));
}
std::optional<std::pair<std::string_view, std::string_view>> SplitStringOnce(
std::string_view input,
std::string_view separators) {
return SplitStringAtExclusive(input, input.find_first_of(separators));
}
std::optional<std::pair<std::string_view, std::string_view>> RSplitStringOnce(
std::string_view input,
char separator) {
return SplitStringAtExclusive(input, input.rfind(separator));
}
std::optional<std::pair<std::string_view, std::string_view>> RSplitStringOnce(
std::string_view input,
std::string_view separators) {
return SplitStringAtExclusive(input, input.find_last_of(separators));
}
std::vector<std::string> SplitString(std::string_view input,
std::string_view separators,
WhitespaceHandling whitespace,
SplitResult result_type) {
return internal::SplitStringT<std::string>(input, separators, whitespace,
result_type);
}
std::vector<std::u16string> SplitString(std::u16string_view input,
std::u16string_view separators,
WhitespaceHandling whitespace,
SplitResult result_type) {
return internal::SplitStringT<std::u16string>(input, separators, whitespace,
result_type);
}
std::vector<std::string_view> SplitStringPiece(std::string_view input,
std::string_view separators,
WhitespaceHandling whitespace,
SplitResult result_type) {
return internal::SplitStringT<std::string_view>(input, separators, whitespace,
result_type);
}
std::vector<std::u16string_view> SplitStringPiece(
std::u16string_view input,
std::u16string_view separators,
WhitespaceHandling whitespace,
SplitResult result_type) {
return internal::SplitStringT<std::u16string_view>(input, separators,
whitespace, result_type);
}
bool SplitStringIntoKeyValuePairs(std::string_view input,
char key_value_delimiter,
char key_value_pair_delimiter,
StringPairs* key_value_pairs) {
return SplitStringIntoKeyValuePairsUsingSubstr(
input, key_value_delimiter,
std::string_view(&key_value_pair_delimiter, 1), key_value_pairs);
}
bool SplitStringIntoKeyValueViewPairs(std::string_view input,
char key_value_delimiter,
char key_value_pair_delimiter,
StringViewPairs* key_value_pairs) {
return SplitStringIntoKeyValueViewPairsUsingSubstr(
input, key_value_delimiter,
std::string_view(&key_value_pair_delimiter, 1), key_value_pairs);
}
bool SplitStringIntoKeyValuePairsUsingSubstr(
std::string_view input,
char key_value_delimiter,
std::string_view key_value_pair_delimiter,
StringPairs* key_value_pairs) {
StringViewPairs key_value_view_pairs;
bool success = SplitStringIntoKeyValueViewPairsUsingSubstr(
input, key_value_delimiter, key_value_pair_delimiter,
&key_value_view_pairs);
// Copy key_value_view_pairs regardless of success to allow for pairs without
// associated value or key.
key_value_pairs->clear();
key_value_pairs->reserve(key_value_view_pairs.size());
for (const auto& [key, value] : key_value_view_pairs) {
key_value_pairs->emplace_back(std::string(key), std::string(value));
}
return success;
}
bool SplitStringIntoKeyValueViewPairsUsingSubstr(
std::string_view input,
char key_value_delimiter,
std::string_view key_value_pair_delimiter,
StringViewPairs* key_value_pairs) {
key_value_pairs->clear();
std::vector<std::string_view> pairs = SplitStringPieceUsingSubstr(
input, key_value_pair_delimiter, TRIM_WHITESPACE, SPLIT_WANT_NONEMPTY);
key_value_pairs->reserve(pairs.size());
bool success = true;
for (std::string_view pair : pairs) {
if (!AppendStringViewKeyValue(pair, key_value_delimiter, key_value_pairs)) {
// Don't return here, to allow for pairs without associated
// value or key; just record that the split failed.
success = false;
}
}
return success;
}
std::vector<std::u16string> SplitStringUsingSubstr(
std::u16string_view input,
std::u16string_view delimiter,
WhitespaceHandling whitespace,
SplitResult result_type) {
return internal::SplitStringUsingSubstrT<std::u16string>(
input, delimiter, whitespace, result_type);
}
std::vector<std::string> SplitStringUsingSubstr(std::string_view input,
std::string_view delimiter,
WhitespaceHandling whitespace,
SplitResult result_type) {
return internal::SplitStringUsingSubstrT<std::string>(
input, delimiter, whitespace, result_type);
}
std::vector<std::u16string_view> SplitStringPieceUsingSubstr(
std::u16string_view input,
std::u16string_view delimiter,
WhitespaceHandling whitespace,
SplitResult result_type) {
std::vector<std::u16string_view> result;
return internal::SplitStringUsingSubstrT<std::u16string_view>(
input, delimiter, whitespace, result_type);
}
std::vector<std::string_view> SplitStringPieceUsingSubstr(
std::string_view input,
std::string_view delimiter,
WhitespaceHandling whitespace,
SplitResult result_type) {
return internal::SplitStringUsingSubstrT<std::string_view>(
input, delimiter, whitespace, result_type);
}
} // namespace base
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