mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-23 08:00:20 +00:00
6704961c82
This removes the awkward String::replace API which was the only String
API which mutated the String and replaces it with a new immutable
version that returns a new String with the replacements applied. This
also fixes a couple of UAFs that were caused by the use of this API.
As an optimization an equivalent StringView::replace API was also added
to remove an unnecessary String allocations in the format of:
`String { view }.replace(...);`
474 lines
15 KiB
C++
474 lines
15 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <awesomekling@gmail.com>
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* Copyright (c) 2020, Fei Wu <f.eiwu@yahoo.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/CharacterTypes.h>
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#include <AK/MemMem.h>
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#include <AK/Memory.h>
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#include <AK/Optional.h>
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#include <AK/String.h>
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#include <AK/StringBuilder.h>
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#include <AK/StringUtils.h>
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#include <AK/StringView.h>
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#include <AK/Vector.h>
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namespace AK {
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namespace StringUtils {
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bool matches(const StringView& str, const StringView& mask, CaseSensitivity case_sensitivity, Vector<MaskSpan>* match_spans)
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{
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auto record_span = [&match_spans](size_t start, size_t length) {
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if (match_spans)
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match_spans->append({ start, length });
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};
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if (str.is_null() || mask.is_null())
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return str.is_null() && mask.is_null();
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if (mask == "*") {
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record_span(0, str.length());
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return true;
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}
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const char* string_ptr = str.characters_without_null_termination();
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const char* string_start = str.characters_without_null_termination();
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const char* string_end = string_ptr + str.length();
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const char* mask_ptr = mask.characters_without_null_termination();
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const char* mask_end = mask_ptr + mask.length();
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auto matches_one = [](char ch, char p, CaseSensitivity case_sensitivity) {
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if (p == '?')
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return true;
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if (ch == 0)
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return false;
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if (case_sensitivity == CaseSensitivity::CaseSensitive)
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return p == ch;
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return to_ascii_lowercase(p) == to_ascii_lowercase(ch);
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};
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while (string_ptr < string_end && mask_ptr < mask_end) {
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auto string_start_ptr = string_ptr;
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switch (*mask_ptr) {
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case '*':
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if (mask_ptr[1] == 0) {
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record_span(string_ptr - string_start, string_end - string_ptr);
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return true;
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}
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while (string_ptr < string_end && !matches(string_ptr, mask_ptr + 1, case_sensitivity))
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++string_ptr;
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record_span(string_start_ptr - string_start, string_ptr - string_start_ptr);
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--string_ptr;
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break;
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case '?':
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record_span(string_ptr - string_start, 1);
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break;
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default:
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if (!matches_one(*string_ptr, *mask_ptr, case_sensitivity))
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return false;
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break;
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}
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++string_ptr;
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++mask_ptr;
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}
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if (string_ptr == string_end) {
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// Allow ending '*' to contain nothing.
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while (mask_ptr != mask_end && *mask_ptr == '*') {
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record_span(string_ptr - string_start, 0);
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++mask_ptr;
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}
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}
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return string_ptr == string_end && mask_ptr == mask_end;
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}
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template<typename T>
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Optional<T> convert_to_int(const StringView& str, TrimWhitespace trim_whitespace)
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{
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auto string = trim_whitespace == TrimWhitespace::Yes
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? str.trim_whitespace()
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: str;
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if (string.is_empty())
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return {};
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T sign = 1;
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size_t i = 0;
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const auto characters = string.characters_without_null_termination();
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if (characters[0] == '-' || characters[0] == '+') {
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if (string.length() == 1)
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return {};
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i++;
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if (characters[0] == '-')
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sign = -1;
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}
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T value = 0;
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for (; i < string.length(); i++) {
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if (characters[i] < '0' || characters[i] > '9')
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return {};
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if (__builtin_mul_overflow(value, 10, &value))
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return {};
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if (__builtin_add_overflow(value, sign * (characters[i] - '0'), &value))
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return {};
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}
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return value;
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}
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template Optional<i8> convert_to_int(const StringView& str, TrimWhitespace);
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template Optional<i16> convert_to_int(const StringView& str, TrimWhitespace);
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template Optional<i32> convert_to_int(const StringView& str, TrimWhitespace);
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template Optional<i64> convert_to_int(const StringView& str, TrimWhitespace);
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template<typename T>
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Optional<T> convert_to_uint(const StringView& str, TrimWhitespace trim_whitespace)
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{
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auto string = trim_whitespace == TrimWhitespace::Yes
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? str.trim_whitespace()
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: str;
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if (string.is_empty())
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return {};
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T value = 0;
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const auto characters = string.characters_without_null_termination();
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for (size_t i = 0; i < string.length(); i++) {
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if (characters[i] < '0' || characters[i] > '9')
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return {};
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if (__builtin_mul_overflow(value, 10, &value))
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return {};
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if (__builtin_add_overflow(value, characters[i] - '0', &value))
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return {};
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}
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return value;
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}
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template Optional<u8> convert_to_uint(const StringView& str, TrimWhitespace);
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template Optional<u16> convert_to_uint(const StringView& str, TrimWhitespace);
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template Optional<u32> convert_to_uint(const StringView& str, TrimWhitespace);
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template Optional<u64> convert_to_uint(const StringView& str, TrimWhitespace);
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template Optional<long> convert_to_uint(const StringView& str, TrimWhitespace);
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template Optional<long long> convert_to_uint(const StringView& str, TrimWhitespace);
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template<typename T>
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Optional<T> convert_to_uint_from_hex(const StringView& str, TrimWhitespace trim_whitespace)
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{
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auto string = trim_whitespace == TrimWhitespace::Yes
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? str.trim_whitespace()
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: str;
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if (string.is_empty())
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return {};
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T value = 0;
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const auto count = string.length();
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const T upper_bound = NumericLimits<T>::max();
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for (size_t i = 0; i < count; i++) {
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char digit = string[i];
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u8 digit_val;
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if (value > (upper_bound >> 4))
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return {};
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if (digit >= '0' && digit <= '9') {
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digit_val = digit - '0';
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} else if (digit >= 'a' && digit <= 'f') {
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digit_val = 10 + (digit - 'a');
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} else if (digit >= 'A' && digit <= 'F') {
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digit_val = 10 + (digit - 'A');
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} else {
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return {};
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}
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value = (value << 4) + digit_val;
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}
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return value;
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}
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template Optional<u8> convert_to_uint_from_hex(const StringView& str, TrimWhitespace);
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template Optional<u16> convert_to_uint_from_hex(const StringView& str, TrimWhitespace);
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template Optional<u32> convert_to_uint_from_hex(const StringView& str, TrimWhitespace);
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template Optional<u64> convert_to_uint_from_hex(const StringView& str, TrimWhitespace);
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bool equals_ignoring_case(const StringView& a, const StringView& b)
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{
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if (a.length() != b.length())
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return false;
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for (size_t i = 0; i < a.length(); ++i) {
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if (to_ascii_lowercase(a.characters_without_null_termination()[i]) != to_ascii_lowercase(b.characters_without_null_termination()[i]))
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return false;
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}
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return true;
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}
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bool ends_with(const StringView& str, const StringView& end, CaseSensitivity case_sensitivity)
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{
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if (end.is_empty())
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return true;
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if (str.is_empty())
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return false;
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if (end.length() > str.length())
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return false;
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if (case_sensitivity == CaseSensitivity::CaseSensitive)
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return !memcmp(str.characters_without_null_termination() + (str.length() - end.length()), end.characters_without_null_termination(), end.length());
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auto str_chars = str.characters_without_null_termination();
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auto end_chars = end.characters_without_null_termination();
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size_t si = str.length() - end.length();
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for (size_t ei = 0; ei < end.length(); ++si, ++ei) {
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if (to_ascii_lowercase(str_chars[si]) != to_ascii_lowercase(end_chars[ei]))
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return false;
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}
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return true;
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}
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bool starts_with(const StringView& str, const StringView& start, CaseSensitivity case_sensitivity)
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{
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if (start.is_empty())
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return true;
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if (str.is_empty())
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return false;
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if (start.length() > str.length())
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return false;
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if (str.characters_without_null_termination() == start.characters_without_null_termination())
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return true;
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if (case_sensitivity == CaseSensitivity::CaseSensitive)
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return !memcmp(str.characters_without_null_termination(), start.characters_without_null_termination(), start.length());
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auto str_chars = str.characters_without_null_termination();
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auto start_chars = start.characters_without_null_termination();
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size_t si = 0;
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for (size_t starti = 0; starti < start.length(); ++si, ++starti) {
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if (to_ascii_lowercase(str_chars[si]) != to_ascii_lowercase(start_chars[starti]))
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return false;
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}
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return true;
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}
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bool contains(const StringView& str, const StringView& needle, CaseSensitivity case_sensitivity)
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{
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if (str.is_null() || needle.is_null() || str.is_empty() || needle.length() > str.length())
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return false;
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if (needle.is_empty())
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return true;
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auto str_chars = str.characters_without_null_termination();
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auto needle_chars = needle.characters_without_null_termination();
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if (case_sensitivity == CaseSensitivity::CaseSensitive)
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return memmem(str_chars, str.length(), needle_chars, needle.length()) != nullptr;
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auto needle_first = to_ascii_lowercase(needle_chars[0]);
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for (size_t si = 0; si < str.length(); si++) {
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if (to_ascii_lowercase(str_chars[si]) != needle_first)
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continue;
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for (size_t ni = 0; si + ni < str.length(); ni++) {
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if (to_ascii_lowercase(str_chars[si + ni]) != to_ascii_lowercase(needle_chars[ni])) {
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si += ni;
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break;
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}
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if (ni + 1 == needle.length())
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return true;
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}
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}
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return false;
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}
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bool is_whitespace(const StringView& str)
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{
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return all_of(str, is_ascii_space);
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}
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StringView trim(const StringView& str, const StringView& characters, TrimMode mode)
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{
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size_t substring_start = 0;
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size_t substring_length = str.length();
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if (mode == TrimMode::Left || mode == TrimMode::Both) {
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for (size_t i = 0; i < str.length(); ++i) {
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if (substring_length == 0)
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return "";
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if (!characters.contains(str[i]))
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break;
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++substring_start;
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--substring_length;
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}
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}
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if (mode == TrimMode::Right || mode == TrimMode::Both) {
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for (size_t i = str.length() - 1; i > 0; --i) {
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if (substring_length == 0)
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return "";
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if (!characters.contains(str[i]))
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break;
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--substring_length;
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}
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}
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return str.substring_view(substring_start, substring_length);
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}
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StringView trim_whitespace(const StringView& str, TrimMode mode)
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{
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return trim(str, " \n\t\v\f\r", mode);
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}
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Optional<size_t> find(StringView const& haystack, char needle, size_t start)
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{
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if (start >= haystack.length())
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return {};
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for (size_t i = start; i < haystack.length(); ++i) {
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if (haystack[i] == needle)
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return i;
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}
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return {};
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}
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Optional<size_t> find(StringView const& haystack, StringView const& needle, size_t start)
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{
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if (start > haystack.length())
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return {};
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auto index = AK::memmem_optional(
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haystack.characters_without_null_termination() + start, haystack.length() - start,
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needle.characters_without_null_termination(), needle.length());
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return index.has_value() ? (*index + start) : index;
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}
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Optional<size_t> find_last(StringView const& haystack, char needle)
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{
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for (size_t i = haystack.length(); i > 0; --i) {
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if (haystack[i - 1] == needle)
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return i - 1;
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}
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return {};
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}
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Vector<size_t> find_all(StringView const& haystack, StringView const& needle)
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{
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Vector<size_t> positions;
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size_t current_position = 0;
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while (current_position <= haystack.length()) {
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auto maybe_position = AK::memmem_optional(
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haystack.characters_without_null_termination() + current_position, haystack.length() - current_position,
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needle.characters_without_null_termination(), needle.length());
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if (!maybe_position.has_value())
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break;
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positions.append(current_position + *maybe_position);
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current_position += *maybe_position + 1;
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}
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return positions;
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}
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Optional<size_t> find_any_of(StringView const& haystack, StringView const& needles, SearchDirection direction)
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{
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if (haystack.is_empty() || needles.is_empty())
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return {};
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if (direction == SearchDirection::Forward) {
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for (size_t i = 0; i < haystack.length(); ++i) {
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if (needles.contains(haystack[i]))
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return i;
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}
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} else if (direction == SearchDirection::Backward) {
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for (size_t i = haystack.length(); i > 0; --i) {
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if (needles.contains(haystack[i - 1]))
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return i - 1;
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}
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}
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return {};
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}
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String to_snakecase(const StringView& str)
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{
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auto should_insert_underscore = [&](auto i, auto current_char) {
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if (i == 0)
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return false;
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auto previous_ch = str[i - 1];
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if (is_ascii_lower_alpha(previous_ch) && is_ascii_upper_alpha(current_char))
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return true;
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if (i >= str.length() - 1)
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return false;
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auto next_ch = str[i + 1];
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if (is_ascii_upper_alpha(current_char) && is_ascii_lower_alpha(next_ch))
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return true;
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return false;
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};
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StringBuilder builder;
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for (size_t i = 0; i < str.length(); ++i) {
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auto ch = str[i];
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if (should_insert_underscore(i, ch))
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builder.append('_');
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builder.append_as_lowercase(ch);
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}
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return builder.to_string();
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}
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String to_titlecase(StringView const& str)
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{
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StringBuilder builder;
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bool next_is_upper = true;
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for (auto ch : str) {
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if (next_is_upper)
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builder.append_code_point(to_ascii_uppercase(ch));
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else
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builder.append_code_point(to_ascii_lowercase(ch));
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next_is_upper = ch == ' ';
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}
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return builder.to_string();
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}
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String replace(StringView const& str, StringView const& needle, StringView const& replacement, bool all_occurrences)
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{
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if (str.is_empty())
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return str;
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Vector<size_t> positions;
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if (all_occurrences) {
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positions = str.find_all(needle);
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if (!positions.size())
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return str;
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} else {
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auto pos = str.find(needle);
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if (!pos.has_value())
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return str;
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positions.append(pos.value());
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}
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StringBuilder replaced_string;
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size_t last_position = 0;
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for (auto& position : positions) {
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replaced_string.append(str.substring_view(last_position, position - last_position));
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replaced_string.append(replacement);
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last_position = position + needle.length();
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}
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replaced_string.append(str.substring_view(last_position, str.length() - last_position));
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return replaced_string.build();
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}
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// TODO: Benchmark against KMP (AK/MemMem.h) and switch over if it's faster for short strings too
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size_t count(StringView const& str, StringView const& needle)
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{
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if (needle.is_empty())
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return str.length();
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size_t count = 0;
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for (size_t i = 0; i < str.length() - needle.length() + 1; ++i) {
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if (str.substring_view(i).starts_with(needle))
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count++;
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}
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return count;
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}
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}
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}
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