mirror of
https://github.com/idanoo/GoScrobble.git
synced 2024-11-22 16:35:14 +00:00
198 lines
5.1 KiB
JavaScript
198 lines
5.1 KiB
JavaScript
var List = require('css-tree').List;
|
|
var clone = require('css-tree').clone;
|
|
var usageUtils = require('./usage');
|
|
var clean = require('./clean');
|
|
var replace = require('./replace');
|
|
var restructure = require('./restructure');
|
|
var walk = require('css-tree').walk;
|
|
|
|
function readChunk(children, specialComments) {
|
|
var buffer = new List();
|
|
var nonSpaceTokenInBuffer = false;
|
|
var protectedComment;
|
|
|
|
children.nextUntil(children.head, function(node, item, list) {
|
|
if (node.type === 'Comment') {
|
|
if (!specialComments || node.value.charAt(0) !== '!') {
|
|
list.remove(item);
|
|
return;
|
|
}
|
|
|
|
if (nonSpaceTokenInBuffer || protectedComment) {
|
|
return true;
|
|
}
|
|
|
|
list.remove(item);
|
|
protectedComment = node;
|
|
return;
|
|
}
|
|
|
|
if (node.type !== 'WhiteSpace') {
|
|
nonSpaceTokenInBuffer = true;
|
|
}
|
|
|
|
buffer.insert(list.remove(item));
|
|
});
|
|
|
|
return {
|
|
comment: protectedComment,
|
|
stylesheet: {
|
|
type: 'StyleSheet',
|
|
loc: null,
|
|
children: buffer
|
|
}
|
|
};
|
|
}
|
|
|
|
function compressChunk(ast, firstAtrulesAllowed, num, options) {
|
|
options.logger('Compress block #' + num, null, true);
|
|
|
|
var seed = 1;
|
|
|
|
if (ast.type === 'StyleSheet') {
|
|
ast.firstAtrulesAllowed = firstAtrulesAllowed;
|
|
ast.id = seed++;
|
|
}
|
|
|
|
walk(ast, {
|
|
visit: 'Atrule',
|
|
enter: function markScopes(node) {
|
|
if (node.block !== null) {
|
|
node.block.id = seed++;
|
|
}
|
|
}
|
|
});
|
|
options.logger('init', ast);
|
|
|
|
// remove redundant
|
|
clean(ast, options);
|
|
options.logger('clean', ast);
|
|
|
|
// replace nodes for shortened forms
|
|
replace(ast, options);
|
|
options.logger('replace', ast);
|
|
|
|
// structure optimisations
|
|
if (options.restructuring) {
|
|
restructure(ast, options);
|
|
}
|
|
|
|
return ast;
|
|
}
|
|
|
|
function getCommentsOption(options) {
|
|
var comments = 'comments' in options ? options.comments : 'exclamation';
|
|
|
|
if (typeof comments === 'boolean') {
|
|
comments = comments ? 'exclamation' : false;
|
|
} else if (comments !== 'exclamation' && comments !== 'first-exclamation') {
|
|
comments = false;
|
|
}
|
|
|
|
return comments;
|
|
}
|
|
|
|
function getRestructureOption(options) {
|
|
if ('restructure' in options) {
|
|
return options.restructure;
|
|
}
|
|
|
|
return 'restructuring' in options ? options.restructuring : true;
|
|
}
|
|
|
|
function wrapBlock(block) {
|
|
return new List().appendData({
|
|
type: 'Rule',
|
|
loc: null,
|
|
prelude: {
|
|
type: 'SelectorList',
|
|
loc: null,
|
|
children: new List().appendData({
|
|
type: 'Selector',
|
|
loc: null,
|
|
children: new List().appendData({
|
|
type: 'TypeSelector',
|
|
loc: null,
|
|
name: 'x'
|
|
})
|
|
})
|
|
},
|
|
block: block
|
|
});
|
|
}
|
|
|
|
module.exports = function compress(ast, options) {
|
|
ast = ast || { type: 'StyleSheet', loc: null, children: new List() };
|
|
options = options || {};
|
|
|
|
var compressOptions = {
|
|
logger: typeof options.logger === 'function' ? options.logger : function() {},
|
|
restructuring: getRestructureOption(options),
|
|
forceMediaMerge: Boolean(options.forceMediaMerge),
|
|
usage: options.usage ? usageUtils.buildIndex(options.usage) : false
|
|
};
|
|
var specialComments = getCommentsOption(options);
|
|
var firstAtrulesAllowed = true;
|
|
var input;
|
|
var output = new List();
|
|
var chunk;
|
|
var chunkNum = 1;
|
|
var chunkChildren;
|
|
|
|
if (options.clone) {
|
|
ast = clone(ast);
|
|
}
|
|
|
|
if (ast.type === 'StyleSheet') {
|
|
input = ast.children;
|
|
ast.children = output;
|
|
} else {
|
|
input = wrapBlock(ast);
|
|
}
|
|
|
|
do {
|
|
chunk = readChunk(input, Boolean(specialComments));
|
|
compressChunk(chunk.stylesheet, firstAtrulesAllowed, chunkNum++, compressOptions);
|
|
chunkChildren = chunk.stylesheet.children;
|
|
|
|
if (chunk.comment) {
|
|
// add \n before comment if there is another content in output
|
|
if (!output.isEmpty()) {
|
|
output.insert(List.createItem({
|
|
type: 'Raw',
|
|
value: '\n'
|
|
}));
|
|
}
|
|
|
|
output.insert(List.createItem(chunk.comment));
|
|
|
|
// add \n after comment if chunk is not empty
|
|
if (!chunkChildren.isEmpty()) {
|
|
output.insert(List.createItem({
|
|
type: 'Raw',
|
|
value: '\n'
|
|
}));
|
|
}
|
|
}
|
|
|
|
if (firstAtrulesAllowed && !chunkChildren.isEmpty()) {
|
|
var lastRule = chunkChildren.last();
|
|
|
|
if (lastRule.type !== 'Atrule' ||
|
|
(lastRule.name !== 'import' && lastRule.name !== 'charset')) {
|
|
firstAtrulesAllowed = false;
|
|
}
|
|
}
|
|
|
|
if (specialComments !== 'exclamation') {
|
|
specialComments = false;
|
|
}
|
|
|
|
output.appendList(chunkChildren);
|
|
} while (!input.isEmpty());
|
|
|
|
return {
|
|
ast: ast
|
|
};
|
|
};
|