mirror of
https://github.com/LadybirdBrowser/ladybird.git
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269 lines
8.4 KiB
C++
269 lines
8.4 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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* 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 met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (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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#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/StringUtils.h>
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#include <AK/StringView.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)
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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 (case_sensitivity == CaseSensitivity::CaseInsensitive) {
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const String str_lower = String(str).to_lowercase();
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const String mask_lower = String(mask).to_lowercase();
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return matches(str_lower, mask_lower, CaseSensitivity::CaseSensitive);
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}
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const char* string_ptr = 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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// Match string against mask directly unless we hit a *
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while ((string_ptr < string_end) && (mask_ptr < mask_end) && (*mask_ptr != '*')) {
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if ((*mask_ptr != *string_ptr) && (*mask_ptr != '?'))
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return false;
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mask_ptr++;
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string_ptr++;
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}
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const char* cp = nullptr;
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const char* mp = nullptr;
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while (string_ptr < string_end) {
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if ((mask_ptr < mask_end) && (*mask_ptr == '*')) {
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// If we have only a * left, there is no way to not match.
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if (++mask_ptr == mask_end)
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return true;
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mp = mask_ptr;
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cp = string_ptr + 1;
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} else if ((mask_ptr < mask_end) && ((*mask_ptr == *string_ptr) || (*mask_ptr == '?'))) {
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mask_ptr++;
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string_ptr++;
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} else if ((cp != nullptr) && (mp != nullptr)) {
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mask_ptr = mp;
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string_ptr = cp++;
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} else {
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break;
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}
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}
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// Handle any trailing mask
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while ((mask_ptr < mask_end) && (*mask_ptr == '*'))
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mask_ptr++;
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// If we 'ate' all of the mask and the string then we match.
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return (mask_ptr == mask_end) && string_ptr == string_end;
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}
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Optional<int> convert_to_int(const StringView& str)
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{
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if (str.is_empty())
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return {};
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bool negative = false;
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size_t i = 0;
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const auto characters = str.characters_without_null_termination();
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if (characters[0] == '-' || characters[0] == '+') {
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if (str.length() == 1)
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return {};
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i++;
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negative = (characters[0] == '-');
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}
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int value = 0;
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for (; i < str.length(); i++) {
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if (characters[i] < '0' || characters[i] > '9')
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return {};
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value = value * 10;
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value += characters[i] - '0';
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}
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return negative ? -value : value;
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}
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Optional<unsigned> convert_to_uint(const StringView& str)
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{
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if (str.is_empty())
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return {};
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unsigned value = 0;
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const auto characters = str.characters_without_null_termination();
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for (size_t i = 0; i < str.length(); i++) {
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if (characters[i] < '0' || characters[i] > '9')
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return {};
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value = value * 10;
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value += characters[i] - '0';
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}
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return value;
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}
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Optional<unsigned> convert_to_uint_from_hex(const StringView& str)
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{
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if (str.is_empty())
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return {};
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unsigned value = 0;
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const auto count = str.length();
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for (size_t i = 0; i < count; i++) {
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char digit = str[i];
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u8 digit_val;
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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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static inline char to_lowercase(char c)
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{
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if (c >= 'A' && c <= 'Z')
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return c | 0x20;
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return c;
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}
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bool equals_ignoring_case(const StringView& a, const StringView& b)
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{
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if (a.impl() && a.impl() == b.impl())
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return true;
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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_lowercase(a.characters_without_null_termination()[i]) != to_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_lowercase(str_chars[si]) != to_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_lowercase(str_chars[si]) != to_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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StringView trim_whitespace(const StringView& str, TrimMode mode)
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{
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auto is_whitespace_character = [](char ch) -> bool {
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return ch == '\t'
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|| ch == '\n'
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|| ch == '\v'
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|| ch == '\f'
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|| ch == '\r'
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|| ch == ' ';
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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 (!is_whitespace_character(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 (!is_whitespace_character(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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}
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}
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