lepu-test-platform-web/node_modules/css-tree/lib/syntax/node/Declaration.js

154 lines
4.4 KiB
JavaScript

var isCustomProperty = require('../../utils/names').isCustomProperty;
var TYPE = require('../../tokenizer').TYPE;
var rawMode = require('./Raw').mode;
var IDENT = TYPE.Ident;
var HASH = TYPE.Hash;
var COLON = TYPE.Colon;
var SEMICOLON = TYPE.Semicolon;
var DELIM = TYPE.Delim;
var EXCLAMATIONMARK = 0x0021; // U+0021 EXCLAMATION MARK (!)
var NUMBERSIGN = 0x0023; // U+0023 NUMBER SIGN (#)
var DOLLARSIGN = 0x0024; // U+0024 DOLLAR SIGN ($)
var AMPERSAND = 0x0026; // U+0026 ANPERSAND (&)
var ASTERISK = 0x002A; // U+002A ASTERISK (*)
var PLUSSIGN = 0x002B; // U+002B PLUS SIGN (+)
var SOLIDUS = 0x002F; // U+002F SOLIDUS (/)
function consumeValueRaw(startToken) {
return this.Raw(startToken, rawMode.exclamationMarkOrSemicolon, true);
}
function consumeCustomPropertyRaw(startToken) {
return this.Raw(startToken, rawMode.exclamationMarkOrSemicolon, false);
}
function consumeValue() {
var startValueToken = this.scanner.tokenIndex;
var value = this.Value();
if (value.type !== 'Raw' &&
this.scanner.eof === false &&
this.scanner.tokenType !== SEMICOLON &&
this.scanner.isDelim(EXCLAMATIONMARK) === false &&
this.scanner.isBalanceEdge(startValueToken) === false) {
this.error();
}
return value;
}
module.exports = {
name: 'Declaration',
structure: {
important: [Boolean, String],
property: String,
value: ['Value', 'Raw']
},
parse: function() {
var start = this.scanner.tokenStart;
var startToken = this.scanner.tokenIndex;
var property = readProperty.call(this);
var customProperty = isCustomProperty(property);
var parseValue = customProperty ? this.parseCustomProperty : this.parseValue;
var consumeRaw = customProperty ? consumeCustomPropertyRaw : consumeValueRaw;
var important = false;
var value;
this.scanner.skipSC();
this.eat(COLON);
if (!customProperty) {
this.scanner.skipSC();
}
if (parseValue) {
value = this.parseWithFallback(consumeValue, consumeRaw);
} else {
value = consumeRaw.call(this, this.scanner.tokenIndex);
}
if (this.scanner.isDelim(EXCLAMATIONMARK)) {
important = getImportant.call(this);
this.scanner.skipSC();
}
// Do not include semicolon to range per spec
// https://drafts.csswg.org/css-syntax/#declaration-diagram
if (this.scanner.eof === false &&
this.scanner.tokenType !== SEMICOLON &&
this.scanner.isBalanceEdge(startToken) === false) {
this.error();
}
return {
type: 'Declaration',
loc: this.getLocation(start, this.scanner.tokenStart),
important: important,
property: property,
value: value
};
},
generate: function(node) {
this.chunk(node.property);
this.chunk(':');
this.node(node.value);
if (node.important) {
this.chunk(node.important === true ? '!important' : '!' + node.important);
}
},
walkContext: 'declaration'
};
function readProperty() {
var start = this.scanner.tokenStart;
var prefix = 0;
// hacks
if (this.scanner.tokenType === DELIM) {
switch (this.scanner.source.charCodeAt(this.scanner.tokenStart)) {
case ASTERISK:
case DOLLARSIGN:
case PLUSSIGN:
case NUMBERSIGN:
case AMPERSAND:
this.scanner.next();
break;
// TODO: not sure we should support this hack
case SOLIDUS:
this.scanner.next();
if (this.scanner.isDelim(SOLIDUS)) {
this.scanner.next();
}
break;
}
}
if (prefix) {
this.scanner.skip(prefix);
}
if (this.scanner.tokenType === HASH) {
this.eat(HASH);
} else {
this.eat(IDENT);
}
return this.scanner.substrToCursor(start);
}
// ! ws* important
function getImportant() {
this.eat(DELIM);
this.scanner.skipSC();
var important = this.consume(IDENT);
// store original value in case it differ from `important`
// for better original source restoring and hacks like `!ie` support
return important === 'important' ? true : important;
}