source: trip-planner-front/node_modules/css-tree/lib/lexer/structure.js@ eed0bf8

Last change on this file since eed0bf8 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

  • Property mode set to 100644
File size: 5.1 KB
Line 
1var List = require('../common/List');
2var hasOwnProperty = Object.prototype.hasOwnProperty;
3
4function isValidNumber(value) {
5 // Number.isInteger(value) && value >= 0
6 return (
7 typeof value === 'number' &&
8 isFinite(value) &&
9 Math.floor(value) === value &&
10 value >= 0
11 );
12}
13
14function isValidLocation(loc) {
15 return (
16 Boolean(loc) &&
17 isValidNumber(loc.offset) &&
18 isValidNumber(loc.line) &&
19 isValidNumber(loc.column)
20 );
21}
22
23function createNodeStructureChecker(type, fields) {
24 return function checkNode(node, warn) {
25 if (!node || node.constructor !== Object) {
26 return warn(node, 'Type of node should be an Object');
27 }
28
29 for (var key in node) {
30 var valid = true;
31
32 if (hasOwnProperty.call(node, key) === false) {
33 continue;
34 }
35
36 if (key === 'type') {
37 if (node.type !== type) {
38 warn(node, 'Wrong node type `' + node.type + '`, expected `' + type + '`');
39 }
40 } else if (key === 'loc') {
41 if (node.loc === null) {
42 continue;
43 } else if (node.loc && node.loc.constructor === Object) {
44 if (typeof node.loc.source !== 'string') {
45 key += '.source';
46 } else if (!isValidLocation(node.loc.start)) {
47 key += '.start';
48 } else if (!isValidLocation(node.loc.end)) {
49 key += '.end';
50 } else {
51 continue;
52 }
53 }
54
55 valid = false;
56 } else if (fields.hasOwnProperty(key)) {
57 for (var i = 0, valid = false; !valid && i < fields[key].length; i++) {
58 var fieldType = fields[key][i];
59
60 switch (fieldType) {
61 case String:
62 valid = typeof node[key] === 'string';
63 break;
64
65 case Boolean:
66 valid = typeof node[key] === 'boolean';
67 break;
68
69 case null:
70 valid = node[key] === null;
71 break;
72
73 default:
74 if (typeof fieldType === 'string') {
75 valid = node[key] && node[key].type === fieldType;
76 } else if (Array.isArray(fieldType)) {
77 valid = node[key] instanceof List;
78 }
79 }
80 }
81 } else {
82 warn(node, 'Unknown field `' + key + '` for ' + type + ' node type');
83 }
84
85 if (!valid) {
86 warn(node, 'Bad value for `' + type + '.' + key + '`');
87 }
88 }
89
90 for (var key in fields) {
91 if (hasOwnProperty.call(fields, key) &&
92 hasOwnProperty.call(node, key) === false) {
93 warn(node, 'Field `' + type + '.' + key + '` is missed');
94 }
95 }
96 };
97}
98
99function processStructure(name, nodeType) {
100 var structure = nodeType.structure;
101 var fields = {
102 type: String,
103 loc: true
104 };
105 var docs = {
106 type: '"' + name + '"'
107 };
108
109 for (var key in structure) {
110 if (hasOwnProperty.call(structure, key) === false) {
111 continue;
112 }
113
114 var docsTypes = [];
115 var fieldTypes = fields[key] = Array.isArray(structure[key])
116 ? structure[key].slice()
117 : [structure[key]];
118
119 for (var i = 0; i < fieldTypes.length; i++) {
120 var fieldType = fieldTypes[i];
121 if (fieldType === String || fieldType === Boolean) {
122 docsTypes.push(fieldType.name);
123 } else if (fieldType === null) {
124 docsTypes.push('null');
125 } else if (typeof fieldType === 'string') {
126 docsTypes.push('<' + fieldType + '>');
127 } else if (Array.isArray(fieldType)) {
128 docsTypes.push('List'); // TODO: use type enum
129 } else {
130 throw new Error('Wrong value `' + fieldType + '` in `' + name + '.' + key + '` structure definition');
131 }
132 }
133
134 docs[key] = docsTypes.join(' | ');
135 }
136
137 return {
138 docs: docs,
139 check: createNodeStructureChecker(name, fields)
140 };
141}
142
143module.exports = {
144 getStructureFromConfig: function(config) {
145 var structure = {};
146
147 if (config.node) {
148 for (var name in config.node) {
149 if (hasOwnProperty.call(config.node, name)) {
150 var nodeType = config.node[name];
151
152 if (nodeType.structure) {
153 structure[name] = processStructure(name, nodeType);
154 } else {
155 throw new Error('Missed `structure` field in `' + name + '` node type definition');
156 }
157 }
158 }
159 }
160
161 return structure;
162 }
163};
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