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// Copyright 2013 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Author: jdtang@google.com (Jonathan Tang)
//
// Print out the positions of all elements with a certain CSS class.
#include <stdlib.h>
#include <string.h>
#include <algorithm>
#include <fstream>
#include <iostream>
#include <string>
#include "gumbo.h"
static std::string find_line(
const std::string& original_text, const GumboAttribute& attr) {
size_t attr_index = attr.original_value.data - original_text.data();
size_t begin = original_text.rfind("\n", attr_index) + 1;
size_t end = original_text.find("\n", attr_index);
if (end != std::string::npos) {
end--;
} else {
end = (size_t) original_text.length() - 1;
}
end = std::min(end, attr_index + 40);
begin = std::max(begin, attr_index - 40);
return original_text.substr(begin, end - begin);
}
static void search_for_class(
GumboNode* node, const std::string& original_text, const char* cls_name) {
if (node->type != GUMBO_NODE_ELEMENT) {
return;
}
GumboAttribute* cls_attr;
if ((cls_attr = gumbo_get_attribute(&node->v.element.attributes, "class")) &&
strstr(cls_attr->value, cls_name) != NULL) {
std::cout << cls_attr->value_start.line << ":"
<< cls_attr->value_start.column << " - "
<< find_line(original_text, *cls_attr) << std::endl;
}
GumboVector* children = &node->v.element.children;
for (int i = 0; i < children->length; ++i) {
search_for_class(
static_cast<GumboNode*>(children->data[i]), original_text, cls_name);
}
}
int main(int argc, char** argv) {
if (argc != 3) {
std::cout << "Usage: positions_of_class <html filename> <CSS classname>.\n";
exit(EXIT_FAILURE);
}
const char* filename = argv[1];
const char* cls = argv[2];
std::ifstream in(filename, std::ios::in | std::ios::binary);
if (!in) {
std::cout << "File " << filename << " not found!\n";
exit(EXIT_FAILURE);
}
std::string contents;
in.seekg(0, std::ios::end);
contents.resize(in.tellg());
in.seekg(0, std::ios::beg);
in.read(&contents[0], contents.size());
in.close();
// If you used contents.c_str(), it'd be harder to match up original
// positions, because c_str() creates a copy of the string and you can't do
// pointer arithmetic betweent contents.data() and the original_* pointers.
GumboOutput* output = gumbo_parse_with_options(
&kGumboDefaultOptions, contents.data(), contents.length());
search_for_class(output->root, contents, cls);
gumbo_destroy_output(output);
}
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