audiobookshelf/server/libs/css/stringify/compress.js

/**
 * Module dependencies.
 */

var Base = require('./compiler');
var inherits = require('inherits');

/**
 * Expose compiler.
 */

module.exports = Compiler;

/**
 * Initialize a new `Compiler`.
 */

function Compiler(options) {
  Base.call(this, options);
}

/**
 * Inherit from `Base.prototype`.
 */

inherits(Compiler, Base);

/**
 * Compile `node`.
 */

Compiler.prototype.compile = function(node){
  return node.stylesheet
    .rules.map(this.visit, this)
    .join('');
};

/**
 * Visit comment node.
 */

Compiler.prototype.comment = function(node){
  return this.emit('', node.position);
};

/**
 * Visit import node.
 */

Compiler.prototype.import = function(node){
  return this.emit('@import ' + node.import + ';', node.position);
};

/**
 * Visit media node.
 */

Compiler.prototype.media = function(node){
  return this.emit('@media ' + node.media, node.position)
    + this.emit('{')
    + this.mapVisit(node.rules)
    + this.emit('}');
};

/**
 * Visit document node.
 */

Compiler.prototype.document = function(node){
  var doc = '@' + (node.vendor || '') + 'document ' + node.document;

  return this.emit(doc, node.position)
    + this.emit('{')
    + this.mapVisit(node.rules)
    + this.emit('}');
};

/**
 * Visit charset node.
 */

Compiler.prototype.charset = function(node){
  return this.emit('@charset ' + node.charset + ';', node.position);
};

/**
 * Visit namespace node.
 */

Compiler.prototype.namespace = function(node){
  return this.emit('@namespace ' + node.namespace + ';', node.position);
};

/**
 * Visit supports node.
 */

Compiler.prototype.supports = function(node){
  return this.emit('@supports ' + node.supports, node.position)
    + this.emit('{')
    + this.mapVisit(node.rules)
    + this.emit('}');
};

/**
 * Visit keyframes node.
 */

Compiler.prototype.keyframes = function(node){
  return this.emit('@'
    + (node.vendor || '')
    + 'keyframes '
    + node.name, node.position)
    + this.emit('{')
    + this.mapVisit(node.keyframes)
    + this.emit('}');
};

/**
 * Visit keyframe node.
 */

Compiler.prototype.keyframe = function(node){
  var decls = node.declarations;

  return this.emit(node.values.join(','), node.position)
    + this.emit('{')
    + this.mapVisit(decls)
    + this.emit('}');
};

/**
 * Visit page node.
 */

Compiler.prototype.page = function(node){
  var sel = node.selectors.length
    ? node.selectors.join(', ')
    : '';

  return this.emit('@page ' + sel, node.position)
    + this.emit('{')
    + this.mapVisit(node.declarations)
    + this.emit('}');
};

/**
 * Visit font-face node.
 */

Compiler.prototype['font-face'] = function(node){
  return this.emit('@font-face', node.position)
    + this.emit('{')
    + this.mapVisit(node.declarations)
    + this.emit('}');
};

/**
 * Visit host node.
 */

Compiler.prototype.host = function(node){
  return this.emit('@host', node.position)
    + this.emit('{')
    + this.mapVisit(node.rules)
    + this.emit('}');
};

/**
 * Visit custom-media node.
 */

Compiler.prototype['custom-media'] = function(node){
  return this.emit('@custom-media ' + node.name + ' ' + node.media + ';', node.position);
};

/**
 * Visit rule node.
 */

Compiler.prototype.rule = function(node){
  var decls = node.declarations;
  if (!decls.length) return '';

  return this.emit(node.selectors.join(','), node.position)
    + this.emit('{')
    + this.mapVisit(decls)
    + this.emit('}');
};

/**
 * Visit declaration node.
 */

Compiler.prototype.declaration = function(node){
  return this.emit(node.property + ':' + node.value, node.position) + this.emit(';');
};