source: trip-planner-front/node_modules/parse5-sax-parser/lib/parser-feedback-simulator.js@ b738035

Last change on this file since b738035 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

  • Property mode set to 100644
File size: 5.1 KB
Line 
1'use strict';
2
3const Tokenizer = require('parse5/lib/tokenizer');
4const foreignContent = require('parse5/lib/common/foreign-content');
5const unicode = require('parse5/lib/common/unicode');
6const HTML = require('parse5/lib/common/html');
7
8//Aliases
9const $ = HTML.TAG_NAMES;
10const NS = HTML.NAMESPACES;
11
12//ParserFeedbackSimulator
13//Simulates adjustment of the Tokenizer which performed by standard parser during tree construction.
14class ParserFeedbackSimulator {
15 constructor(tokenizer) {
16 this.tokenizer = tokenizer;
17
18 this.namespaceStack = [];
19 this.namespaceStackTop = -1;
20 this._enterNamespace(NS.HTML);
21 }
22
23 getNextToken() {
24 const token = this.tokenizer.getNextToken();
25
26 if (token.type === Tokenizer.START_TAG_TOKEN) {
27 this._handleStartTagToken(token);
28 } else if (token.type === Tokenizer.END_TAG_TOKEN) {
29 this._handleEndTagToken(token);
30 } else if (token.type === Tokenizer.NULL_CHARACTER_TOKEN && this.inForeignContent) {
31 token.type = Tokenizer.CHARACTER_TOKEN;
32 token.chars = unicode.REPLACEMENT_CHARACTER;
33 } else if (this.skipNextNewLine) {
34 if (token.type !== Tokenizer.HIBERNATION_TOKEN) {
35 this.skipNextNewLine = false;
36 }
37
38 if (token.type === Tokenizer.WHITESPACE_CHARACTER_TOKEN && token.chars[0] === '\n') {
39 if (token.chars.length === 1) {
40 return this.getNextToken();
41 }
42
43 token.chars = token.chars.substr(1);
44 }
45 }
46
47 return token;
48 }
49
50 //Namespace stack mutations
51 _enterNamespace(namespace) {
52 this.namespaceStackTop++;
53 this.namespaceStack.push(namespace);
54
55 this.inForeignContent = namespace !== NS.HTML;
56 this.currentNamespace = namespace;
57 this.tokenizer.allowCDATA = this.inForeignContent;
58 }
59
60 _leaveCurrentNamespace() {
61 this.namespaceStackTop--;
62 this.namespaceStack.pop();
63
64 this.currentNamespace = this.namespaceStack[this.namespaceStackTop];
65 this.inForeignContent = this.currentNamespace !== NS.HTML;
66 this.tokenizer.allowCDATA = this.inForeignContent;
67 }
68
69 //Token handlers
70 _ensureTokenizerMode(tn) {
71 if (tn === $.TEXTAREA || tn === $.TITLE) {
72 this.tokenizer.state = Tokenizer.MODE.RCDATA;
73 } else if (tn === $.PLAINTEXT) {
74 this.tokenizer.state = Tokenizer.MODE.PLAINTEXT;
75 } else if (tn === $.SCRIPT) {
76 this.tokenizer.state = Tokenizer.MODE.SCRIPT_DATA;
77 } else if (
78 tn === $.STYLE ||
79 tn === $.IFRAME ||
80 tn === $.XMP ||
81 tn === $.NOEMBED ||
82 tn === $.NOFRAMES ||
83 tn === $.NOSCRIPT
84 ) {
85 this.tokenizer.state = Tokenizer.MODE.RAWTEXT;
86 }
87 }
88
89 _handleStartTagToken(token) {
90 let tn = token.tagName;
91
92 if (tn === $.SVG) {
93 this._enterNamespace(NS.SVG);
94 } else if (tn === $.MATH) {
95 this._enterNamespace(NS.MATHML);
96 }
97
98 if (this.inForeignContent) {
99 if (foreignContent.causesExit(token)) {
100 this._leaveCurrentNamespace();
101 return;
102 }
103
104 const currentNs = this.currentNamespace;
105
106 if (currentNs === NS.MATHML) {
107 foreignContent.adjustTokenMathMLAttrs(token);
108 } else if (currentNs === NS.SVG) {
109 foreignContent.adjustTokenSVGTagName(token);
110 foreignContent.adjustTokenSVGAttrs(token);
111 }
112
113 foreignContent.adjustTokenXMLAttrs(token);
114
115 tn = token.tagName;
116
117 if (!token.selfClosing && foreignContent.isIntegrationPoint(tn, currentNs, token.attrs)) {
118 this._enterNamespace(NS.HTML);
119 }
120 } else {
121 if (tn === $.PRE || tn === $.TEXTAREA || tn === $.LISTING) {
122 this.skipNextNewLine = true;
123 } else if (tn === $.IMAGE) {
124 token.tagName = $.IMG;
125 }
126
127 this._ensureTokenizerMode(tn);
128 }
129 }
130
131 _handleEndTagToken(token) {
132 let tn = token.tagName;
133
134 if (!this.inForeignContent) {
135 const previousNs = this.namespaceStack[this.namespaceStackTop - 1];
136
137 if (previousNs === NS.SVG && foreignContent.SVG_TAG_NAMES_ADJUSTMENT_MAP[tn]) {
138 tn = foreignContent.SVG_TAG_NAMES_ADJUSTMENT_MAP[tn];
139 }
140
141 //NOTE: check for exit from integration point
142 if (foreignContent.isIntegrationPoint(tn, previousNs, token.attrs)) {
143 this._leaveCurrentNamespace();
144 }
145 } else if (
146 (tn === $.SVG && this.currentNamespace === NS.SVG) ||
147 (tn === $.MATH && this.currentNamespace === NS.MATHML)
148 ) {
149 this._leaveCurrentNamespace();
150 }
151
152 // NOTE: adjust end tag name as well for consistency
153 if (this.currentNamespace === NS.SVG) {
154 foreignContent.adjustTokenSVGTagName(token);
155 }
156 }
157}
158
159module.exports = ParserFeedbackSimulator;
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