forked from google/gumbo-parser
-
Notifications
You must be signed in to change notification settings - Fork 0
/
prettyprint.cc
355 lines (282 loc) · 10.3 KB
/
prettyprint.cc
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
// Copyright 2015 Kevin B. Hendricks, Stratford, Ontario, All Rights Reserved.
// loosely based on a greatly simplified version of BeautifulSoup4 decode() routine
//
// 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: Kevin Hendricks
//
// Prettyprint back to html / xhtml
#include <fstream>
#include <iostream>
#include <stdlib.h>
#include <string>
#include "gumbo.h"
static std::string nonbreaking_inline = "|a|abbr|acronym|b|bdo|big|cite|code|dfn|em|font|i|img|kbd|nobr|s|small|span|strike|strong|sub|sup|tt|";
static std::string empty_tags = "|area|base|basefont|bgsound|br|command|col|embed|event-source|frame|hr|image|img|input|keygen|link|menuitem|meta|param|source|spacer|track|wbr|";
static std::string preserve_whitespace = "|pre|textarea|script|style|";
static std::string special_handling = "|html|body|";
static std::string no_entity_sub = "|script|style|";
static std::string treat_like_inline = "|p|";
static inline void rtrim(std::string &s)
{
s.erase(s.find_last_not_of(" \n\r\t")+1);
}
static inline void ltrim(std::string &s)
{
s.erase(0,s.find_first_not_of(" \n\r\t"));
}
static void replace_all(std::string &s, const char * s1, const char * s2)
{
std::string t1(s1);
size_t len = t1.length();
size_t pos = s.find(t1);
while (pos != std::string::npos) {
s.replace(pos, len, s2);
pos = s.find(t1, pos + len);
}
}
static std::string substitute_xml_entities_into_text(const std::string &text)
{
std::string result = text;
// replacing & must come first
replace_all(result, "&", "&");
replace_all(result, "<", "<");
replace_all(result, ">", ">");
return result;
}
static std::string substitute_xml_entities_into_attributes(char quote, const std::string &text)
{
std::string result = substitute_xml_entities_into_text(text);
if (quote == '"') {
replace_all(result,"\"",""");
}
else if (quote == '\'') {
replace_all(result,"'","'");
}
return result;
}
static std::string handle_unknown_tag(GumboStringPiece *text)
{
std::string tagname = "";
if (text->data == NULL) {
return tagname;
}
// work with copy GumboStringPiece to prevent asserts
// if try to read same unknown tag name more than once
GumboStringPiece gsp = *text;
gumbo_tag_from_original_text(&gsp);
tagname = std::string(gsp.data, gsp.length);
return tagname;
}
static std::string get_tag_name(GumboNode *node)
{
std::string tagname;
// work around lack of proper name for document node
if (node->type == GUMBO_NODE_DOCUMENT) {
tagname = "document";
} else {
tagname = gumbo_normalized_tagname(node->v.element.tag);
}
if (tagname.empty()) {
tagname = handle_unknown_tag(&node->v.element.original_tag);
}
return tagname;
}
static std::string build_doctype(GumboNode *node)
{
std::string results = "";
if (node->v.document.has_doctype) {
results.append("<!DOCTYPE ");
results.append(node->v.document.name);
std::string pi(node->v.document.public_identifier);
if ((node->v.document.public_identifier != NULL) && !pi.empty() ) {
results.append(" PUBLIC \"");
results.append(node->v.document.public_identifier);
results.append("\" \"");
results.append(node->v.document.system_identifier);
results.append("\"");
}
results.append(">\n");
}
return results;
}
static std::string build_attributes(GumboAttribute * at, bool no_entities)
{
std::string atts = "";
atts.append(" ");
atts.append(at->name);
// how do we want to handle attributes with empty values
// <input type="checkbox" checked /> or <input type="checkbox" checked="" />
if ( (!std::string(at->value).empty()) ||
(at->original_value.data[0] == '"') ||
(at->original_value.data[0] == '\'') ) {
// determine original quote character used if it exists
char quote = at->original_value.data[0];
std::string qs = "";
if (quote == '\'') qs = std::string("'");
if (quote == '"') qs = std::string("\"");
atts.append("=");
atts.append(qs);
if (no_entities) {
atts.append(at->value);
} else {
atts.append(substitute_xml_entities_into_attributes(quote, std::string(at->value)));
}
atts.append(qs);
}
return atts;
}
// forward declaration
static std::string prettyprint(GumboNode*, int lvl, const std::string indent_chars);
// prettyprint children of a node
// may be invoked recursively
static std::string prettyprint_contents(GumboNode* node, int lvl, const std::string indent_chars) {
std::string contents = "";
std::string tagname = get_tag_name(node);
std::string key = "|" + tagname + "|";
bool no_entity_substitution = no_entity_sub.find(key) != std::string::npos;
bool keep_whitespace = preserve_whitespace.find(key) != std::string::npos;
bool is_inline = nonbreaking_inline.find(key) != std::string::npos;
bool pp_okay = !is_inline && !keep_whitespace;
GumboVector* children = &node->v.element.children;
for (unsigned int i = 0; i < children->length; ++i) {
GumboNode* child = static_cast<GumboNode*> (children->data[i]);
if (child->type == GUMBO_NODE_TEXT) {
std::string val;
if (no_entity_substitution) {
val = std::string(child->v.text.text);
} else {
val = substitute_xml_entities_into_text(std::string(child->v.text.text));
}
if (pp_okay) rtrim(val);
if (pp_okay && (contents.length() == 0)) {
// add required indentation
char c = indent_chars.at(0);
int n = indent_chars.length();
contents.append(std::string((lvl-1)*n,c));
}
contents.append(val);
} else if ((child->type == GUMBO_NODE_ELEMENT) || (child->type == GUMBO_NODE_TEMPLATE)) {
std::string val = prettyprint(child, lvl, indent_chars);
// remove any indentation if this child is inline and not first child
std::string childname = get_tag_name(child);
std::string childkey = "|" + childname + "|";
if ((nonbreaking_inline.find(childkey) != std::string::npos) && (contents.length() > 0)) {
ltrim(val);
}
contents.append(val);
} else if (child->type == GUMBO_NODE_WHITESPACE) {
if (keep_whitespace || is_inline) {
contents.append(std::string(child->v.text.text));
}
} else if (child->type != GUMBO_NODE_COMMENT) {
// Does this actually exist: (child->type == GUMBO_NODE_CDATA)
fprintf(stderr, "unknown element of type: %d\n", child->type);
}
}
return contents;
}
// prettyprint a GumboNode back to html/xhtml
// may be invoked recursively
static std::string prettyprint(GumboNode* node, int lvl, const std::string indent_chars) {
// special case the document node
if (node->type == GUMBO_NODE_DOCUMENT) {
std::string results = build_doctype(node);
results.append(prettyprint_contents(node,lvl+1,indent_chars));
return results;
}
std::string close = "";
std::string closeTag = "";
std::string atts = "";
std::string tagname = get_tag_name(node);
std::string key = "|" + tagname + "|";
bool need_special_handling = special_handling.find(key) != std::string::npos;
bool is_empty_tag = empty_tags.find(key) != std::string::npos;
bool no_entity_substitution = no_entity_sub.find(key) != std::string::npos;
bool keep_whitespace = preserve_whitespace.find(key) != std::string::npos;
bool is_inline = nonbreaking_inline.find(key) != std::string::npos;
bool inline_like = treat_like_inline.find(key) != std::string::npos;
bool pp_okay = !is_inline && !keep_whitespace;
char c = indent_chars.at(0);
int n = indent_chars.length();
// build attr string
const GumboVector * attribs = &node->v.element.attributes;
for (int i=0; i< attribs->length; ++i) {
GumboAttribute* at = static_cast<GumboAttribute*>(attribs->data[i]);
atts.append(build_attributes(at, no_entity_substitution));
}
// determine closing tag type
if (is_empty_tag) {
close = "/";
} else {
closeTag = "</" + tagname + ">";
}
std::string indent_space = std::string((lvl-1)*n,c);
// prettyprint your contents
std::string contents = prettyprint_contents(node, lvl+1, indent_chars);
if (need_special_handling) {
rtrim(contents);
contents.append("\n");
}
char last_char = ' ';
if (!contents.empty()) {
last_char = contents.at(contents.length()-1);
}
// build results
std::string results;
if (pp_okay) {
results.append(indent_space);
}
results.append("<"+tagname+atts+close+">");
if (pp_okay && !inline_like) {
results.append("\n");
}
if (inline_like) {
ltrim(contents);
}
results.append(contents);
if (pp_okay && !contents.empty() && (last_char != '\n') && (!inline_like)) {
results.append("\n");
}
if (pp_okay && !inline_like && !closeTag.empty()) {
results.append(indent_space);
}
results.append(closeTag);
if (pp_okay && !closeTag.empty()) {
results.append("\n");
}
return results;
}
int main(int argc, char** argv) {
if (argc != 2) {
std::cout << "prettyprint <html filename>\n";
exit(EXIT_FAILURE);
}
const char* filename = argv[1];
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();
GumboOptions options = kGumboDefaultOptions;
GumboOutput* output = gumbo_parse_with_options(&options, contents.data(), contents.length());
std::string indent_chars = " ";
std::cout << prettyprint(output->document, 0, indent_chars) << std::endl;
gumbo_destroy_output(&kGumboDefaultOptions, output);
}