Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/gumbo-parser/examples/get_title.c @ 46:7ee69f120f19 default tip

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +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 // Retrieves the title of a page.
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19 #include <assert.h>
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20 #include <stdio.h>
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21 #include <stdlib.h>
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22 #include <sys/stat.h>
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24 #include "gumbo.h"
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26 static void read_file(FILE* fp, char** output, int* length) {
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27 struct stat filestats;
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28 int fd = fileno(fp);
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29 fstat(fd, &filestats);
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30 *length = filestats.st_size;
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31 *output = malloc(*length + 1);
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32 int start = 0;
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33 int bytes_read;
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34 while ((bytes_read = fread(*output + start, 1, *length - start, fp))) {
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35 start += bytes_read;
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36 }
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37 }
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38
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39 static const char* find_title(const GumboNode* root) {
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40 assert(root->type == GUMBO_NODE_ELEMENT);
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41 assert(root->v.element.children.length >= 2);
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42
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43 const GumboVector* root_children = &root->v.element.children;
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44 GumboNode* head = NULL;
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45 for (int i = 0; i < root_children->length; ++i) {
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46 GumboNode* child = root_children->data[i];
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47 if (child->type == GUMBO_NODE_ELEMENT &&
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48 child->v.element.tag == GUMBO_TAG_HEAD) {
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49 head = child;
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50 break;
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51 }
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52 }
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53 assert(head != NULL);
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54
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55 GumboVector* head_children = &head->v.element.children;
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56 for (int i = 0; i < head_children->length; ++i) {
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57 GumboNode* child = head_children->data[i];
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58 if (child->type == GUMBO_NODE_ELEMENT &&
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59 child->v.element.tag == GUMBO_TAG_TITLE) {
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60 if (child->v.element.children.length != 1) {
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61 return "<empty title>";
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62 }
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63 GumboNode* title_text = child->v.element.children.data[0];
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64 assert(title_text->type == GUMBO_NODE_TEXT || title_text->type == GUMBO_NODE_WHITESPACE);
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65 return title_text->v.text.text;
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66 }
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67 }
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68 return "<no title found>";
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69 }
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70
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71 int main(int argc, const char** argv) {
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72 if (argc != 2) {
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73 printf("Usage: get_title <html filename>.\n");
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74 exit(EXIT_FAILURE);
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75 }
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76 const char* filename = argv[1];
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77
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78 FILE* fp = fopen(filename, "r");
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79 if (!fp) {
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80 printf("File %s not found!\n", filename);
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81 exit(EXIT_FAILURE);
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82 }
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83
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84 char* input;
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85 int input_length;
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86 read_file(fp, &input, &input_length);
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87 GumboOutput* output = gumbo_parse_with_options(
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88 &kGumboDefaultOptions, input, input_length);
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89 const char* title = find_title(output->root);
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90 printf("%s\n", title);
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91 gumbo_destroy_output(&kGumboDefaultOptions, output);
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92 free(input);
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93 }