hexo/node_modules/stylus/lib/nodes/ident.js

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2023-09-25 15:58:56 +08:00
/*!
* Stylus - Ident
* Copyright (c) Automattic <developer.wordpress.com>
* MIT Licensed
*/
/**
* Module dependencies.
*/
var Node = require('./node')
, nodes = require('./');
/**
* Initialize a new `Ident` by `name` with the given `val` node.
*
* @param {String} name
* @param {Node} val
* @api public
*/
var Ident = module.exports = function Ident(name, val, mixin){
Node.call(this);
this.name = name;
this.string = name;
this.val = val || nodes.null;
this.mixin = !!mixin;
};
/**
* Check if the variable has a value.
*
* @return {Boolean}
* @api public
*/
Ident.prototype.__defineGetter__('isEmpty', function(){
return undefined == this.val;
});
/**
* Return hash.
*
* @return {String}
* @api public
*/
Ident.prototype.__defineGetter__('hash', function(){
return this.name;
});
/**
* Inherit from `Node.prototype`.
*/
Ident.prototype.__proto__ = Node.prototype;
/**
* Return a clone of this node.
*
* @return {Node}
* @api public
*/
Ident.prototype.clone = function(parent){
var clone = new Ident(this.name);
clone.val = this.val.clone(parent, clone);
clone.mixin = this.mixin;
clone.lineno = this.lineno;
clone.column = this.column;
clone.filename = this.filename;
clone.property = this.property;
clone.rest = this.rest;
return clone;
};
/**
* Return a JSON representation of this node.
*
* @return {Object}
* @api public
*/
Ident.prototype.toJSON = function(){
return {
__type: 'Ident',
name: this.name,
val: this.val,
mixin: this.mixin,
property: this.property,
rest: this.rest,
lineno: this.lineno,
column: this.column,
filename: this.filename
};
};
/**
* Return <name>.
*
* @return {String}
* @api public
*/
Ident.prototype.toString = function(){
return this.name;
};
/**
* Coerce `other` to an ident.
*
* @param {Node} other
* @return {String}
* @api public
*/
Ident.prototype.coerce = function(other){
switch (other.nodeName) {
case 'ident':
case 'string':
case 'literal':
return new Ident(other.string);
case 'unit':
return new Ident(other.toString());
default:
return Node.prototype.coerce.call(this, other);
}
};
/**
* Operate on `right` with the given `op`.
*
* @param {String} op
* @param {Node} right
* @return {Node}
* @api public
*/
Ident.prototype.operate = function(op, right){
var val = right.first;
switch (op) {
case '-':
if ('unit' == val.nodeName) {
var expr = new nodes.Expression;
val = val.clone();
val.val = -val.val;
expr.push(this);
expr.push(val);
return expr;
}
case '+':
return new nodes.Ident(this.string + this.coerce(val).string);
}
return Node.prototype.operate.call(this, op, right);
};