vue hello world项目
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var Hack = require('./hack');
var Marker = require('../tokenizer/marker');
var Token = require('../tokenizer/token');
var Match = {
ASTERISK: '*',
BACKSLASH: '\\',
BANG: '!',
BANG_SUFFIX_PATTERN: /!\w+$/,
IMPORTANT_TOKEN: '!important',
IMPORTANT_TOKEN_PATTERN: new RegExp('!important$', 'i'),
IMPORTANT_WORD: 'important',
IMPORTANT_WORD_PATTERN: new RegExp('important$', 'i'),
SUFFIX_BANG_PATTERN: /!$/,
UNDERSCORE: '_',
VARIABLE_REFERENCE_PATTERN: /var\(--.+\)$/
};
function wrapAll(properties, skipProperties) {
var wrapped = [];
var single;
var property;
var i;
for (i = properties.length - 1; i >= 0; i--) {
property = properties[i];
if (property[0] != Token.PROPERTY) {
continue;
}
if (skipProperties && skipProperties.indexOf(property[1][1]) > -1) {
continue;
}
single = wrapSingle(property);
single.all = properties;
single.position = i;
wrapped.unshift(single);
}
return wrapped;
}
function someVariableReferences(property) {
var i, l;
var value;
// skipping `property` and property name tokens
for (i = 2, l = property.length; i < l; i++) {
value = property[i];
if (value[0] != Token.PROPERTY_VALUE) {
continue;
}
if (isVariableReference(value[1])) {
return true;
}
}
return false;
}
function isVariableReference(value) {
return Match.VARIABLE_REFERENCE_PATTERN.test(value);
}
function isMultiplex(property) {
var value;
var i, l;
for (i = 3, l = property.length; i < l; i++) {
value = property[i];
if (value[0] == Token.PROPERTY_VALUE && (value[1] == Marker.COMMA || value[1] == Marker.FORWARD_SLASH)) {
return true;
}
}
return false;
}
function hackFrom(property) {
var match = false;
var name = property[1][1];
var lastValue = property[property.length - 1];
if (name[0] == Match.UNDERSCORE) {
match = [Hack.UNDERSCORE];
} else if (name[0] == Match.ASTERISK) {
match = [Hack.ASTERISK];
} else if (lastValue[1][0] == Match.BANG && !lastValue[1].match(Match.IMPORTANT_WORD_PATTERN)) {
match = [Hack.BANG];
} else if (lastValue[1].indexOf(Match.BANG) > 0 && !lastValue[1].match(Match.IMPORTANT_WORD_PATTERN) && Match.BANG_SUFFIX_PATTERN.test(lastValue[1])) {
match = [Hack.BANG];
} else if (lastValue[1].indexOf(Match.BACKSLASH) > 0 && lastValue[1].indexOf(Match.BACKSLASH) == lastValue[1].length - Match.BACKSLASH.length - 1) {
match = [Hack.BACKSLASH, lastValue[1].substring(lastValue[1].indexOf(Match.BACKSLASH) + 1)];
} else if (lastValue[1].indexOf(Match.BACKSLASH) === 0 && lastValue[1].length == 2) {
match = [Hack.BACKSLASH, lastValue[1].substring(1)];
}
return match;
}
function isImportant(property) {
if (property.length < 3)
return false;
var lastValue = property[property.length - 1];
if (Match.IMPORTANT_TOKEN_PATTERN.test(lastValue[1])) {
return true;
} else if (Match.IMPORTANT_WORD_PATTERN.test(lastValue[1]) && Match.SUFFIX_BANG_PATTERN.test(property[property.length - 2][1])) {
return true;
}
return false;
}
function stripImportant(property) {
var lastValue = property[property.length - 1];
var oneButLastValue = property[property.length - 2];
if (Match.IMPORTANT_TOKEN_PATTERN.test(lastValue[1])) {
lastValue[1] = lastValue[1].replace(Match.IMPORTANT_TOKEN_PATTERN, '');
} else {
lastValue[1] = lastValue[1].replace(Match.IMPORTANT_WORD_PATTERN, '');
oneButLastValue[1] = oneButLastValue[1].replace(Match.SUFFIX_BANG_PATTERN, '');
}
if (lastValue[1].length === 0) {
property.pop();
}
if (oneButLastValue[1].length === 0) {
property.pop();
}
}
function stripPrefixHack(property) {
property[1][1] = property[1][1].substring(1);
}
function stripSuffixHack(property, hackFrom) {
var lastValue = property[property.length - 1];
lastValue[1] = lastValue[1]
.substring(0, lastValue[1].indexOf(hackFrom[0] == Hack.BACKSLASH ? Match.BACKSLASH : Match.BANG))
.trim();
if (lastValue[1].length === 0) {
property.pop();
}
}
function wrapSingle(property) {
var importantProperty = isImportant(property);
if (importantProperty) {
stripImportant(property);
}
var whichHack = hackFrom(property);
if (whichHack[0] == Hack.ASTERISK || whichHack[0] == Hack.UNDERSCORE) {
stripPrefixHack(property);
} else if (whichHack[0] == Hack.BACKSLASH || whichHack[0] == Hack.BANG) {
stripSuffixHack(property, whichHack);
}
return {
block: property[2] && property[2][0] == Token.PROPERTY_BLOCK,
components: [],
dirty: false,
dynamic: someVariableReferences(property),
hack: whichHack,
important: importantProperty,
name: property[1][1],
multiplex: property.length > 3 ? isMultiplex(property) : false,
optimizable: true,
position: 0,
shorthand: false,
unused: false,
value: property.slice(2)
};
}
module.exports = {
all: wrapAll,
single: wrapSingle
};