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Diffstat (limited to 'node_modules/montage/core/selector/abstract-selector.js')
-rw-r--r-- | node_modules/montage/core/selector/abstract-selector.js | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/node_modules/montage/core/selector/abstract-selector.js b/node_modules/montage/core/selector/abstract-selector.js new file mode 100644 index 00000000..69bbb810 --- /dev/null +++ b/node_modules/montage/core/selector/abstract-selector.js | |||
@@ -0,0 +1,189 @@ | |||
1 | /* <copyright> | ||
2 | This file contains proprietary software owned by Motorola Mobility, Inc.<br/> | ||
3 | No rights, expressed or implied, whatsoever to this software are provided by Motorola Mobility, Inc. hereunder.<br/> | ||
4 | (c) Copyright 2011 Motorola Mobility, Inc. All Rights Reserved. | ||
5 | </copyright> */ | ||
6 | |||
7 | var Parser = require("./parser").Parser; | ||
8 | |||
9 | exports.makeSelector = makeSelector; | ||
10 | function makeSelector(language) { | ||
11 | |||
12 | var tokens = language.tokens; | ||
13 | var tokenNames = language.tokenNames; | ||
14 | var semantics = language.semantics; | ||
15 | |||
16 | var Selector = function () { | ||
17 | return makeTokenEmitter( | ||
18 | Selector.newWithLanguage(language), | ||
19 | tokenEmitterProperties | ||
20 | ).apply(null, arguments); | ||
21 | }; | ||
22 | |||
23 | Object.defineProperties(Selector, selectorProperties); | ||
24 | |||
25 | Selector.language = language; | ||
26 | |||
27 | var tokenEmitterProperties = language.selectorExtras || {}; | ||
28 | var extraTokenEmitterNames = Object.keys(tokenEmitterProperties); | ||
29 | |||
30 | // Proxied properties of the underlying selector | ||
31 | ['tokens', 'evaluate', 'compile', 'parser', 'syntax'] | ||
32 | .forEach(function (name) { | ||
33 | tokenEmitterProperties[name] = {get: function () { | ||
34 | return this.selector[name]; | ||
35 | }}; | ||
36 | }); | ||
37 | |||
38 | tokenNames.forEach(function (name) { | ||
39 | tokenEmitterProperties[name] = { | ||
40 | get: function () { | ||
41 | this.emit(tokens[name]); | ||
42 | return this; | ||
43 | } | ||
44 | }; | ||
45 | }); | ||
46 | |||
47 | // TODO compute array from extras, move emit from extras | ||
48 | tokenNames | ||
49 | .concat(extraTokenEmitterNames) | ||
50 | .forEach(function (name) { | ||
51 | Object.defineProperty(Selector, name, { | ||
52 | get: function () { | ||
53 | var selector = this.newWithLanguage(language); | ||
54 | var proxy = makeTokenEmitter( | ||
55 | selector, | ||
56 | tokenEmitterProperties | ||
57 | )[name]; | ||
58 | Object.defineProperties(proxy, tokenEmitterProperties); | ||
59 | proxy.selector = selector; | ||
60 | return proxy; | ||
61 | } | ||
62 | }); | ||
63 | }); | ||
64 | |||
65 | Selector.__start = function (token) { | ||
66 | return makeTokenEmitter( | ||
67 | Selector.newWithLanguage(language), | ||
68 | tokenEmitterProperties | ||
69 | ); | ||
70 | }; | ||
71 | |||
72 | return Selector; | ||
73 | } | ||
74 | |||
75 | exports._makeTokenEmitter = makeTokenEmitter; | ||
76 | function makeTokenEmitter(selector, tokenEmitterProperties) { | ||
77 | var tokenEmitter = function () { | ||
78 | var lastIndex = arguments.length - 1; | ||
79 | Array.prototype.forEach.call(arguments, function (argument, index) { | ||
80 | if (argument != null && argument.tokens) { | ||
81 | selector.emit(selector.language.tokens.begin); | ||
82 | argument.tokens.forEach(function (token) { | ||
83 | selector.emit(token); | ||
84 | }); | ||
85 | selector.emit(selector.language.tokens.end); | ||
86 | } else { | ||
87 | selector.emit({type: 'literal', value: argument}); | ||
88 | } | ||
89 | if (index !== lastIndex) { | ||
90 | selector.emit(selector.language.tokens.comma); | ||
91 | } | ||
92 | }); | ||
93 | return tokenEmitter; | ||
94 | }; | ||
95 | Object.defineProperties(tokenEmitter, tokenEmitterProperties); | ||
96 | tokenEmitter.emit = function (token) { | ||
97 | tokenEmitter.selector.emit(token); | ||
98 | return tokenEmitter; | ||
99 | }; | ||
100 | tokenEmitter.selector = selector; | ||
101 | tokenEmitter.language = selector.language; | ||
102 | return tokenEmitter; | ||
103 | } | ||
104 | |||
105 | var selectorProperties = { | ||
106 | |||
107 | newWithLanguage: { | ||
108 | value: function (language) { | ||
109 | var self = Object.create(this); | ||
110 | self.language = language; | ||
111 | self.parser = Parser.newWithLanguage(language, function (syntax) { | ||
112 | self._syntax = syntax; | ||
113 | }); | ||
114 | return self; | ||
115 | } | ||
116 | }, | ||
117 | |||
118 | fromSyntax: { | ||
119 | value: function (syntax) { | ||
120 | var self = Object.create(this); | ||
121 | self._syntax = syntax; | ||
122 | return self; | ||
123 | } | ||
124 | }, | ||
125 | |||
126 | tokens: { | ||
127 | get: function () { | ||
128 | if (!this.parser) { | ||
129 | return []; | ||
130 | } else { | ||
131 | return this.parser.tokens; | ||
132 | } | ||
133 | } | ||
134 | }, | ||
135 | |||
136 | emit: { | ||
137 | value: function (token) { | ||
138 | if (!this.parser) { | ||
139 | return this.__start().emit(token); | ||
140 | } else { | ||
141 | this.parser.emit(token); | ||
142 | return this; | ||
143 | } | ||
144 | } | ||
145 | }, | ||
146 | |||
147 | syntax: { | ||
148 | get: function () { | ||
149 | if (!this.parser) { | ||
150 | return this.language.tokens.value; | ||
151 | } else { | ||
152 | this.emit(this.language.tokens.eof); | ||
153 | return this._syntax; | ||
154 | } | ||
155 | } | ||
156 | }, | ||
157 | |||
158 | compile: { | ||
159 | value: function (parameters) { | ||
160 | if (!this.parser) { | ||
161 | return function (value) { | ||
162 | return value; | ||
163 | }; | ||
164 | } else { | ||
165 | return this.language.semantics.compile( | ||
166 | this.syntax, | ||
167 | parameters | ||
168 | ); | ||
169 | } | ||
170 | } | ||
171 | }, | ||
172 | |||
173 | evaluate: { | ||
174 | value: function (value, parameters, visitor) { | ||
175 | if (!this.parser) { | ||
176 | return value; | ||
177 | } else { | ||
178 | return this.language.semantics.evaluate( | ||
179 | this.syntax, | ||
180 | value, | ||
181 | parameters, | ||
182 | visitor | ||
183 | ); | ||
184 | } | ||
185 | } | ||
186 | } | ||
187 | |||
188 | }; | ||
189 | |||