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CSSCompressor.js
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CSSCompressor.js
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var CSSTree = global.CSSTree;
function CSSCompressor( options ) {
var self = this;
// Force instance of CSSCompressor
if ( ! ( self instanceof CSSCompressor ) ) {
return new CSSCompressor( options );
}
// Initial setings
self.settings = new CSSCompressor.Settings( options || {} );
self.isRerun = false;
self.rerun = false;
self.stats = new CSSCompressor.Stats( self );
self._rerunCount = 0;
self._logs = [];
self._keys = [];
}
CSSCompressor.prototype = {
// Simple logging tool for compressions made
log: function( key, message, positions ) {
var self = this;
// Empty call to log function returns all logs
if ( key === undefined ) {
return self._logs;
}
// Allow for passing just message and position
else if ( positions === undefined && ! CSSCompressor.isString( message ) ) {
positions = message;
message = key;
key = null;
}
// Allow for only passing a message, no position object
else if ( positions === undefined && message === undefined ) {
message = key;
key = null;
}
// Force array of positions
if ( ! CSSCompressor.isArray( positions ) ) {
positions = positions ? [ positions ] : [];
}
// If no key is passed, take the current compression being used
if ( ! key ) {
key = self._keys[ 0 ];
}
self._logs.push({ key: key, message: message, positions: positions });
},
// Runs compression on css script
compress: function( css, options ) {
var self = this, now = Date.now();
// Clear result
self.css = '';
// Static Reference
CSSCompressor._lastRun = self;
// Update settings
if ( options ) {
self.settings.update( options );
}
// Allow running compress() function without css string/tree (already compiled compressor object)
if ( css !== undefined ) {
if ( css instanceof CSSTree ) {
self.original = css.css;
self.tree = css;
}
else {
self.original = css || '';
self.tree = new CSSTree( self.original );
}
self.branches = self.tree.branches;
self.isRerun = false;
self._logs = [];
}
// Stats setup
self.stats.start( now );
// Run compressions
self._compress();
return self.css;
},
// Individual value compressions
value: function( value, position ) {
var self = this,
rules = CSSCompressor.rule( CSSCompressor.RULE_TYPE_VALUE ),
next;
CSSCompressor.each( rules, function( object ) {
if ( self.settings[ object.name ] ) {
self._keys.unshift( object.name );
if ( next = object.callback( value, position, self ) ) {
value = next;
}
self._keys.shift();
}
});
return value;
},
// Cycles through compressions and triggers reruns if necessary
_compress: function(){
var self = this,
sheets = CSSCompressor.rule( CSSCompressor.RULE_TYPE_SHEET );
// Clear previous rerun setting for clean sweep
self.rerun = false;
// Rule sets and blocks
self._blocks( self.branches );
// Full sheet rendering
CSSCompressor.each( sheets, function( object ) {
if ( self.settings[ object.name ] ) {
self._keys.unshift( object.name );
object.callback( self.branches, self );
self._keys.shift();
}
});
// Block recursive loop of reruns
if ( self.rerun && ++self._rerunCount > 10 ) {
self.rerun = false;
self.log( '--- Blocking Rerun, Aleady ran 10 times ---' );
}
// There are cases where a later compression will require
// re-compression rules from earlier on
if ( self.rerun ) {
self.log( null, 'Combinations have been applied, re-running compressions to catch loose ends.' );
self.isRerun = true;
self._compress();
}
// Render the tree into a stylesheet and return it
else {
self._render();
}
},
// Sheet Rendering
_render: function(){
var self = this,
format = CSSCompressor.format[ self.settings.format ];
// Stylesheet generation
if ( format ) {
self.css = format.callback( self );
}
else {
throw new Error( "Readability Option Not Found: '" + self.settings.format + "'" );
}
// Stats
self.stats.end();
},
// Individual blocks
_blocks: function( branches ) {
var self = this,
rules = CSSCompressor.rule( CSSCompressor.RULE_TYPE_RULE ),
blocks = CSSCompressor.rule( CSSCompressor.RULE_TYPE_BLOCK );
CSSCompressor.each( branches, function( branch ) {
// Rule compressions
if ( branch.rules && branch.rules.length ) {
CSSCompressor.each( branch.rules, function( rule ) {
// Part Compressionse
CSSCompressor.each( rule.parts || [], function( value, i ) {
rule.parts[ i ] = self.value( value, rule.position );
});
// Rule Compressions
CSSCompressor.each( rules, function( object ) {
if ( self.settings[ object.name ] ) {
self._keys.unshift( object.name );
object.callback( rule, branch, self );
self._keys.shift();
}
});
});
}
// Full rule blocks
CSSCompressor.each( blocks, function( object ) {
if ( self.settings[ object.name ] ) {
self._keys.unshift( object.name );
object.callback( branch, self );
self._keys.shift();
}
});
// Handle nested entries
if ( branch.branches ) {
self._blocks( branch.branches );
}
});
}
};
// Expose the CSSTree version in use
CSSCompressor.CSSTree = CSSTree;
CSSCompressor.StringIterator = CSSTree.StringIterator;
// Version
CSSCompressor.version = "[VERSION]";
// Expose to NodeJS/Window
if ( typeof module == 'object' && typeof module.exports == 'object' ) {
module.exports = CSSCompressor;
}
else {
global.CSSCompressor = CSSCompressor;
}