mirror of
https://github.com/LadybirdBrowser/ladybird.git
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248 lines
8.5 KiB
C++
248 lines
8.5 KiB
C++
/*
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* Copyright (c) 2019-2020, Marios Prokopakis <mariosprokopakis@gmail.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/QuickSort.h>
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#include <AK/StdLibExtras.h>
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#include <AK/String.h>
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#include <AK/Vector.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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struct Index {
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enum class Type {
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SingleIndex,
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SliceIndex,
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RangedIndex
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};
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ssize_t m_from { -1 };
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ssize_t m_to { -1 };
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Type m_type { Type::SingleIndex };
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bool intersects(const Index& other)
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{
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if (m_type != Type::RangedIndex)
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return m_from == other.m_from;
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return !(other.m_from > m_to || other.m_to < m_from);
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}
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};
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static void print_usage_and_exit(int ret)
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{
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printf("Usage: cut -b list [File]\n");
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exit(ret);
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}
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static void add_if_not_exists(Vector<Index>& indexes, Index data)
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{
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bool append_to_vector = true;
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for (auto& index : indexes) {
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if (index.intersects(data)) {
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if (index.m_type == Index::Type::RangedIndex) {
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index.m_from = AK::min(index.m_from, data.m_from);
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index.m_to = AK::max(index.m_to, data.m_to);
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}
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append_to_vector = false;
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}
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}
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if (append_to_vector) {
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indexes.append(data);
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}
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}
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static void expand_list(Vector<String>& tokens, Vector<Index>& indexes)
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{
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for (auto& token : tokens) {
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if (token.length() == 0) {
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fprintf(stderr, "cut: byte/character positions are numbered from 1\n");
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print_usage_and_exit(1);
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}
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if (token == "-") {
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fprintf(stderr, "cut: invalid range with no endpoint: %s\n", token.characters());
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print_usage_and_exit(1);
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}
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if (token[0] == '-') {
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auto index = token.substring(1, token.length() - 1).to_int();
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if (!index.has_value()) {
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fprintf(stderr, "cut: invalid byte/character position '%s'\n", token.characters());
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print_usage_and_exit(1);
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}
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if (index.value() == 0) {
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fprintf(stderr, "cut: byte/character positions are numbered from 1\n");
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print_usage_and_exit(1);
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}
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Index tmp = { 1, index.value(), Index::Type::RangedIndex };
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add_if_not_exists(indexes, tmp);
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} else if (token[token.length() - 1] == '-') {
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auto index = token.substring(0, token.length() - 1).to_int();
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if (!index.has_value()) {
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fprintf(stderr, "cut: invalid byte/character position '%s'\n", token.characters());
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print_usage_and_exit(1);
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}
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if (index.value() == 0) {
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fprintf(stderr, "cut: byte/character positions are numbered from 1\n");
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print_usage_and_exit(1);
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}
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Index tmp = { index.value(), -1, Index::Type::SliceIndex };
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add_if_not_exists(indexes, tmp);
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} else {
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auto range = token.split('-');
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if (range.size() == 2) {
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auto index1 = range[0].to_int();
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if (!index1.has_value()) {
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fprintf(stderr, "cut: invalid byte/character position '%s'\n", range[0].characters());
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print_usage_and_exit(1);
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}
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auto index2 = range[1].to_int();
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if (!index2.has_value()) {
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fprintf(stderr, "cut: invalid byte/character position '%s'\n", range[1].characters());
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print_usage_and_exit(1);
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}
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if (index1.value() > index2.value()) {
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fprintf(stderr, "cut: invalid decreasing range\n");
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print_usage_and_exit(1);
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} else if (index1.value() == 0 || index2.value() == 0) {
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fprintf(stderr, "cut: byte/character positions are numbered from 1\n");
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print_usage_and_exit(1);
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}
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Index tmp = { index1.value(), index2.value(), Index::Type::RangedIndex };
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add_if_not_exists(indexes, tmp);
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} else if (range.size() == 1) {
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auto index = range[0].to_int();
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if (!index.has_value()) {
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fprintf(stderr, "cut: invalid byte/character position '%s'\n", range[0].characters());
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print_usage_and_exit(1);
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}
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if (index.value() == 0) {
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fprintf(stderr, "cut: byte/character positions are numbered from 1\n");
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print_usage_and_exit(1);
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}
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Index tmp = { index.value(), index.value(), Index::Type::SingleIndex };
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add_if_not_exists(indexes, tmp);
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} else {
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fprintf(stderr, "cut: invalid byte or character range\n");
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print_usage_and_exit(1);
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}
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}
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}
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}
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static void cut_file(const String& file, const Vector<Index>& byte_vector)
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{
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FILE* fp = stdin;
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if (!file.is_null()) {
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fp = fopen(file.characters(), "r");
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if (!fp) {
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fprintf(stderr, "cut: Could not open file '%s'\n", file.characters());
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return;
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}
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}
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char* line = nullptr;
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ssize_t line_length = 0;
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size_t line_capacity = 0;
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while ((line_length = getline(&line, &line_capacity, fp)) != -1) {
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line[line_length - 1] = '\0';
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line_length--;
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for (auto& i : byte_vector) {
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if (i.m_type == Index::Type::SliceIndex && i.m_from < line_length)
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printf("%s", line + i.m_from - 1);
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else if (i.m_type == Index::Type::SingleIndex && i.m_from <= line_length)
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printf("%c", line[i.m_from - 1]);
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else if (i.m_type == Index::Type::RangedIndex && i.m_from <= line_length) {
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auto to = i.m_to > line_length ? line_length : i.m_to;
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auto sub_string = String(line).substring(i.m_from - 1, to - i.m_from + 1);
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printf("%s", sub_string.characters());
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} else
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break;
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}
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printf("\n");
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}
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if (line)
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free(line);
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if (!file.is_null())
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fclose(fp);
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}
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int main(int argc, char** argv)
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{
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String byte_list = "";
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Vector<String> tokens;
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Vector<String> files;
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if (argc == 1) {
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print_usage_and_exit(1);
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}
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for (int i = 1; i < argc;) {
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if (!strcmp(argv[i], "-b")) {
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/* The next argument should be a list of bytes. */
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byte_list = (i + 1 < argc) ? argv[i + 1] : "";
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if (byte_list == "") {
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print_usage_and_exit(1);
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}
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tokens = byte_list.split(',');
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i += 2;
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} else if (!strcmp(argv[i], "--help") || !strcmp(argv[i], "-h")) {
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print_usage_and_exit(1);
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} else if (argv[i][0] != '-') {
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files.append(argv[i++]);
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} else {
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fprintf(stderr, "cut: invalid argument %s\n", argv[i]);
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print_usage_and_exit(1);
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}
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}
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if (byte_list == "")
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print_usage_and_exit(1);
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Vector<Index> byte_vector;
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expand_list(tokens, byte_vector);
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quick_sort(byte_vector, [](auto& a, auto& b) { return a.m_from < b.m_from; });
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if (files.is_empty())
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files.append(String());
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/* Process each file */
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for (auto& file : files)
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cut_file(file, byte_vector);
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return 0;
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}
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