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183 lines
3.4 KiB
183 lines
3.4 KiB
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/**
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* Stringfy the given AST `node`.
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*
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* @param {Object} node
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* @param {Object} options
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* @return {String}
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* @api public
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*/
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module.exports = function(node, options){
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return new Compiler(options).compile(node);
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};
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/**
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* Initialize a new `Compiler`.
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*/
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function Compiler(options) {
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options = options || {};
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this.compress = options.compress;
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this.indentation = options.indent;
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}
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/**
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* Compile `node`.
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*/
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Compiler.prototype.compile = function(node){
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return node.stylesheet.rules.map(this.visit, this)
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.join(this.compress ? '' : '\n\n');
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};
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/**
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* Visit `node`.
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*/
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Compiler.prototype.visit = function(node){
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if (node.charset) return this.charset(node);
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if (node.keyframes) return this.keyframes(node);
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if (node.media) return this.media(node);
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if (node.import) return this.import(node);
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return this.rule(node);
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};
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/**
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* Visit import node.
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*/
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Compiler.prototype.import = function(node){
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return '@import ' + node.import + ';';
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};
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/**
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* Visit media node.
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*/
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Compiler.prototype.media = function(node){
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if (this.compress) {
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return '@media '
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+ node.media
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+ '{'
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+ node.rules.map(this.visit, this).join('')
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+ '}';
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}
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return '@media '
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+ node.media
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+ ' {\n'
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+ this.indent(1)
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+ node.rules.map(this.visit, this).join('\n\n')
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+ this.indent(-1)
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+ '\n}';
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};
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/**
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* Visit charset node.
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*/
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Compiler.prototype.charset = function(node){
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if (this.compress) {
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return '@charset ' + node.charset + ';';
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}
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return '@charset ' + node.charset + ';\n';
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};
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/**
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* Visit keyframes node.
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*/
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Compiler.prototype.keyframes = function(node){
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if (this.compress) {
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return '@'
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+ (node.vendor || '')
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+ 'keyframes '
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+ node.name
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+ '{'
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+ node.keyframes.map(this.keyframe, this).join('')
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+ '}';
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}
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return '@'
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+ (node.vendor || '')
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+ 'keyframes '
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+ node.name
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+ ' {\n'
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+ this.indent(1)
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+ node.keyframes.map(this.keyframe, this).join('\n')
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+ this.indent(-1)
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+ '}';
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};
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/**
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* Visit keyframe node.
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*/
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Compiler.prototype.keyframe = function(node){
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if (this.compress) {
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return node.values.join(',')
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+ '{'
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+ node.declarations.map(this.declaration, this).join(';')
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+ '}';
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}
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return this.indent()
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+ node.values.join(', ')
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+ ' {\n'
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+ this.indent(1)
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+ node.declarations.map(this.declaration, this).join(';\n')
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+ this.indent(-1)
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+ '\n' + this.indent() + '}\n';
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};
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/**
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* Visit rule node.
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*/
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Compiler.prototype.rule = function(node){
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var indent = this.indent();
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if (this.compress) {
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return node.selectors.join(',')
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+ '{'
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+ node.declarations.map(this.declaration, this).join(';')
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+ '}';
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}
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return node.selectors.map(function(s){ return indent + s }).join(',\n')
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+ ' {\n'
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+ this.indent(1)
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+ node.declarations.map(this.declaration, this).join(';\n')
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+ this.indent(-1)
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+ '\n' + this.indent() + '}';
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};
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/**
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* Visit declaration node.
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*/
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Compiler.prototype.declaration = function(node){
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if (this.compress) {
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return node.property + ':' + node.value;
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}
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return this.indent() + node.property + ': ' + node.value;
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};
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/**
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* Increase, decrease or return current indentation.
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*/
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Compiler.prototype.indent = function(level) {
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this.level = this.level || 1;
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if (null != level) {
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this.level += level;
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return '';
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}
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return Array(this.level).join(this.indentation || ' ');
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};
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