Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/gumbo-parser/examples/positions_of_class.cc @ 22:d77477b4e151

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Let _int_rc() also handle (i.e. ignore) a local version suffix
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 19 Sep 2025 12:05:57 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2
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1 // Copyright 2013 Google Inc. All Rights Reserved.
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2 //
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3 // Licensed under the Apache License, Version 2.0 (the "License");
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4 // you may not use this file except in compliance with the License.
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5 // You may obtain a copy of the License at
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6 //
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7 // http://www.apache.org/licenses/LICENSE-2.0
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8 //
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9 // Unless required by applicable law or agreed to in writing, software
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10 // distributed under the License is distributed on an "AS IS" BASIS,
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11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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12 // See the License for the specific language governing permissions and
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13 // limitations under the License.
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14 //
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15 // Author: jdtang@google.com (Jonathan Tang)
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16 //
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17 // Print out the positions of all elements with a certain CSS class.
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18
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19 #include <stdlib.h>
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20 #include <string.h>
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21
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22 #include <algorithm>
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23 #include <fstream>
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24 #include <iostream>
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25 #include <string>
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27 #include "gumbo.h"
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29 static std::string find_line(
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30 const std::string& original_text, const GumboAttribute& attr) {
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31 size_t attr_index = attr.original_value.data - original_text.data();
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32 size_t begin = original_text.rfind("\n", attr_index) + 1;
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33 size_t end = original_text.find("\n", attr_index);
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34 if (end != std::string::npos) {
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35 end--;
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36 } else {
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37 end = (size_t) original_text.length() - 1;
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38 }
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39 end = std::min(end, attr_index + 40);
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40 begin = std::max(begin, attr_index - 40);
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41 return original_text.substr(begin, end - begin);
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42 }
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44 static void search_for_class(
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45 GumboNode* node, const std::string& original_text, const char* cls_name) {
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46 if (node->type != GUMBO_NODE_ELEMENT) {
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47 return;
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48 }
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49 GumboAttribute* cls_attr;
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50 if ((cls_attr = gumbo_get_attribute(&node->v.element.attributes, "class")) &&
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51 strstr(cls_attr->value, cls_name) != NULL) {
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52 std::cout << cls_attr->value_start.line << ":"
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53 << cls_attr->value_start.column << " - "
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54 << find_line(original_text, *cls_attr) << std::endl;
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55 }
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56
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57 GumboVector* children = &node->v.element.children;
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58 for (int i = 0; i < children->length; ++i) {
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59 search_for_class(
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60 static_cast<GumboNode*>(children->data[i]), original_text, cls_name);
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61 }
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62 }
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64 int main(int argc, char** argv) {
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65 if (argc != 3) {
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66 std::cout << "Usage: positions_of_class <html filename> <CSS classname>.\n";
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67 exit(EXIT_FAILURE);
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68 }
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69 const char* filename = argv[1];
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70 const char* cls = argv[2];
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71
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72 std::ifstream in(filename, std::ios::in | std::ios::binary);
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73 if (!in) {
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74 std::cout << "File " << filename << " not found!\n";
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75 exit(EXIT_FAILURE);
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76 }
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77
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78 std::string contents;
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79 in.seekg(0, std::ios::end);
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80 contents.resize(in.tellg());
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81 in.seekg(0, std::ios::beg);
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82 in.read(&contents[0], contents.size());
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83 in.close();
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84
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85 // If you used contents.c_str(), it'd be harder to match up original
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86 // positions, because c_str() creates a copy of the string and you can't do
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87 // pointer arithmetic betweent contents.data() and the original_* pointers.
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88 GumboOutput* output = gumbo_parse_with_options(
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89 &kGumboDefaultOptions, contents.data(), contents.length());
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90 search_for_class(output->root, contents, cls);
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91 gumbo_destroy_output(&kGumboDefaultOptions, output);
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92 }