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diff mupdf-source/thirdparty/gumbo-parser/examples/positions_of_class.cc @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/gumbo-parser/examples/positions_of_class.cc	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,92 @@
+// 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(&kGumboDefaultOptions, output);
+}