493 lines
11 KiB
JavaScript
493 lines
11 KiB
JavaScript
'use strict';
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var isObject = require('isobject');
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var define = require('define-property');
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var utils = require('snapdragon-util');
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var ownNames;
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/**
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* Create a new AST `Node` with the given `val` and `type`.
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*
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* ```js
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* var node = new Node('*', 'Star');
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* var node = new Node({type: 'star', val: '*'});
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* ```
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* @name Node
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* @param {String|Object} `val` Pass a matched substring, or an object to merge onto the node.
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* @param {String} `type` The node type to use when `val` is a string.
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* @return {Object} node instance
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* @api public
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*/
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function Node(val, type, parent) {
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if (typeof type !== 'string') {
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parent = type;
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type = null;
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}
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define(this, 'parent', parent);
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define(this, 'isNode', true);
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define(this, 'expect', null);
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if (typeof type !== 'string' && isObject(val)) {
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lazyKeys();
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var keys = Object.keys(val);
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for (var i = 0; i < keys.length; i++) {
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var key = keys[i];
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if (ownNames.indexOf(key) === -1) {
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this[key] = val[key];
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}
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}
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} else {
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this.type = type;
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this.val = val;
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}
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}
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/**
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* Returns true if the given value is a node.
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*
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* ```js
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* var Node = require('snapdragon-node');
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* var node = new Node({type: 'foo'});
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* console.log(Node.isNode(node)); //=> true
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* console.log(Node.isNode({})); //=> false
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* ```
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* @param {Object} `node`
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* @returns {Boolean}
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* @api public
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*/
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Node.isNode = function(node) {
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return utils.isNode(node);
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};
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/**
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* Define a non-enumberable property on the node instance.
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* Useful for adding properties that shouldn't be extended
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* or visible during debugging.
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*
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* ```js
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* var node = new Node();
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* node.define('foo', 'something non-enumerable');
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* ```
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* @param {String} `name`
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* @param {any} `val`
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* @return {Object} returns the node instance
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* @api public
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*/
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Node.prototype.define = function(name, val) {
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define(this, name, val);
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return this;
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};
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/**
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* Returns true if `node.val` is an empty string, or `node.nodes` does
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* not contain any non-empty text nodes.
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*
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* ```js
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* var node = new Node({type: 'text'});
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* node.isEmpty(); //=> true
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* node.val = 'foo';
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* node.isEmpty(); //=> false
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* ```
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* @param {Function} `fn` (optional) Filter function that is called on `node` and/or child nodes. `isEmpty` will return false immediately when the filter function returns false on any nodes.
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* @return {Boolean}
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* @api public
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*/
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Node.prototype.isEmpty = function(fn) {
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return utils.isEmpty(this, fn);
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};
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/**
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* Given node `foo` and node `bar`, push node `bar` onto `foo.nodes`, and
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* set `foo` as `bar.parent`.
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*
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* ```js
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* var foo = new Node({type: 'foo'});
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* var bar = new Node({type: 'bar'});
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* foo.push(bar);
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* ```
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* @param {Object} `node`
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* @return {Number} Returns the length of `node.nodes`
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* @api public
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*/
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Node.prototype.push = function(node) {
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assert(Node.isNode(node), 'expected node to be an instance of Node');
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define(node, 'parent', this);
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this.nodes = this.nodes || [];
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return this.nodes.push(node);
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};
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/**
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* Given node `foo` and node `bar`, unshift node `bar` onto `foo.nodes`, and
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* set `foo` as `bar.parent`.
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*
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* ```js
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* var foo = new Node({type: 'foo'});
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* var bar = new Node({type: 'bar'});
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* foo.unshift(bar);
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* ```
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* @param {Object} `node`
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* @return {Number} Returns the length of `node.nodes`
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* @api public
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*/
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Node.prototype.unshift = function(node) {
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assert(Node.isNode(node), 'expected node to be an instance of Node');
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define(node, 'parent', this);
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this.nodes = this.nodes || [];
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return this.nodes.unshift(node);
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};
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/**
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* Pop a node from `node.nodes`.
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*
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* ```js
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* var node = new Node({type: 'foo'});
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* node.push(new Node({type: 'a'}));
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* node.push(new Node({type: 'b'}));
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* node.push(new Node({type: 'c'}));
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* node.push(new Node({type: 'd'}));
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* console.log(node.nodes.length);
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* //=> 4
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* node.pop();
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* console.log(node.nodes.length);
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* //=> 3
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* ```
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* @return {Number} Returns the popped `node`
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* @api public
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*/
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Node.prototype.pop = function() {
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return this.nodes && this.nodes.pop();
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};
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/**
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* Shift a node from `node.nodes`.
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*
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* ```js
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* var node = new Node({type: 'foo'});
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* node.push(new Node({type: 'a'}));
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* node.push(new Node({type: 'b'}));
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* node.push(new Node({type: 'c'}));
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* node.push(new Node({type: 'd'}));
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* console.log(node.nodes.length);
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* //=> 4
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* node.shift();
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* console.log(node.nodes.length);
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* //=> 3
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* ```
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* @return {Object} Returns the shifted `node`
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* @api public
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*/
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Node.prototype.shift = function() {
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return this.nodes && this.nodes.shift();
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};
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/**
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* Remove `node` from `node.nodes`.
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*
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* ```js
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* node.remove(childNode);
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* ```
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* @param {Object} `node`
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* @return {Object} Returns the removed node.
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* @api public
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*/
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Node.prototype.remove = function(node) {
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assert(Node.isNode(node), 'expected node to be an instance of Node');
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this.nodes = this.nodes || [];
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var idx = node.index;
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if (idx !== -1) {
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node.index = -1;
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return this.nodes.splice(idx, 1);
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}
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return null;
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};
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/**
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* Get the first child node from `node.nodes` that matches the given `type`.
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* If `type` is a number, the child node at that index is returned.
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*
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* ```js
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* var child = node.find(1); //<= index of the node to get
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* var child = node.find('foo'); //<= node.type of a child node
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* var child = node.find(/^(foo|bar)$/); //<= regex to match node.type
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* var child = node.find(['foo', 'bar']); //<= array of node.type(s)
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* ```
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* @param {String} `type`
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* @return {Object} Returns a child node or undefined.
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* @api public
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*/
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Node.prototype.find = function(type) {
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return utils.findNode(this.nodes, type);
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};
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/**
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* Return true if the node is the given `type`.
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*
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* ```js
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* var node = new Node({type: 'bar'});
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* cosole.log(node.isType('foo')); // false
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* cosole.log(node.isType(/^(foo|bar)$/)); // true
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* cosole.log(node.isType(['foo', 'bar'])); // true
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* ```
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* @param {String} `type`
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* @return {Boolean}
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* @api public
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*/
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Node.prototype.isType = function(type) {
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return utils.isType(this, type);
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};
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/**
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* Return true if the `node.nodes` has the given `type`.
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*
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* ```js
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* var foo = new Node({type: 'foo'});
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* var bar = new Node({type: 'bar'});
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* foo.push(bar);
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*
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* cosole.log(foo.hasType('qux')); // false
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* cosole.log(foo.hasType(/^(qux|bar)$/)); // true
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* cosole.log(foo.hasType(['qux', 'bar'])); // true
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* ```
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* @param {String} `type`
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* @return {Boolean}
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* @api public
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*/
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Node.prototype.hasType = function(type) {
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return utils.hasType(this, type);
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};
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/**
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* Get the siblings array, or `null` if it doesn't exist.
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*
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* ```js
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* var foo = new Node({type: 'foo'});
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* var bar = new Node({type: 'bar'});
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* var baz = new Node({type: 'baz'});
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* foo.push(bar);
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* foo.push(baz);
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*
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* console.log(bar.siblings.length) // 2
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* console.log(baz.siblings.length) // 2
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* ```
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* @return {Array}
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* @api public
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*/
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Object.defineProperty(Node.prototype, 'siblings', {
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set: function() {
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throw new Error('node.siblings is a getter and cannot be defined');
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},
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get: function() {
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return this.parent ? this.parent.nodes : null;
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}
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});
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/**
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* Get the node's current index from `node.parent.nodes`.
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* This should always be correct, even when the parent adds nodes.
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*
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* ```js
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* var foo = new Node({type: 'foo'});
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* var bar = new Node({type: 'bar'});
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* var baz = new Node({type: 'baz'});
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* var qux = new Node({type: 'qux'});
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* foo.push(bar);
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* foo.push(baz);
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* foo.unshift(qux);
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*
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* console.log(bar.index) // 1
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* console.log(baz.index) // 2
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* console.log(qux.index) // 0
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* ```
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* @return {Number}
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* @api public
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*/
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Object.defineProperty(Node.prototype, 'index', {
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set: function(index) {
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define(this, 'idx', index);
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},
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get: function() {
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if (!Array.isArray(this.siblings)) {
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return -1;
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}
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var tok = this.idx !== -1 ? this.siblings[this.idx] : null;
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if (tok !== this) {
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this.idx = this.siblings.indexOf(this);
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}
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return this.idx;
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}
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});
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/**
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* Get the previous node from the siblings array or `null`.
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*
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* ```js
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* var foo = new Node({type: 'foo'});
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* var bar = new Node({type: 'bar'});
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* var baz = new Node({type: 'baz'});
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* foo.push(bar);
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* foo.push(baz);
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*
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* console.log(baz.prev.type) // 'bar'
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* ```
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* @return {Object}
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* @api public
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*/
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Object.defineProperty(Node.prototype, 'prev', {
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set: function() {
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throw new Error('node.prev is a getter and cannot be defined');
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},
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get: function() {
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if (Array.isArray(this.siblings)) {
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return this.siblings[this.index - 1] || this.parent.prev;
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}
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return null;
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}
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});
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/**
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* Get the siblings array, or `null` if it doesn't exist.
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*
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* ```js
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* var foo = new Node({type: 'foo'});
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* var bar = new Node({type: 'bar'});
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* var baz = new Node({type: 'baz'});
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* foo.push(bar);
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* foo.push(baz);
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*
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* console.log(bar.siblings.length) // 2
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* console.log(baz.siblings.length) // 2
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* ```
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* @return {Object}
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* @api public
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*/
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Object.defineProperty(Node.prototype, 'next', {
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set: function() {
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throw new Error('node.next is a getter and cannot be defined');
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},
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get: function() {
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if (Array.isArray(this.siblings)) {
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return this.siblings[this.index + 1] || this.parent.next;
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}
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return null;
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}
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});
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/**
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* Get the first node from `node.nodes`.
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*
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* ```js
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* var foo = new Node({type: 'foo'});
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* var bar = new Node({type: 'bar'});
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* var baz = new Node({type: 'baz'});
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* var qux = new Node({type: 'qux'});
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* foo.push(bar);
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* foo.push(baz);
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* foo.push(qux);
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*
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* console.log(foo.first.type) // 'bar'
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* ```
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* @return {Object} The first node, or undefiend
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* @api public
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*/
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Object.defineProperty(Node.prototype, 'first', {
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get: function() {
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return this.nodes ? this.nodes[0] : null;
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}
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});
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/**
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* Get the last node from `node.nodes`.
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*
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* ```js
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* var foo = new Node({type: 'foo'});
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* var bar = new Node({type: 'bar'});
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* var baz = new Node({type: 'baz'});
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* var qux = new Node({type: 'qux'});
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* foo.push(bar);
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* foo.push(baz);
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* foo.push(qux);
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*
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* console.log(foo.last.type) // 'qux'
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* ```
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* @return {Object} The last node, or undefiend
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* @api public
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*/
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Object.defineProperty(Node.prototype, 'last', {
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get: function() {
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return this.nodes ? utils.last(this.nodes) : null;
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}
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});
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/**
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* Get the last node from `node.nodes`.
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*
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* ```js
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* var foo = new Node({type: 'foo'});
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* var bar = new Node({type: 'bar'});
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* var baz = new Node({type: 'baz'});
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* var qux = new Node({type: 'qux'});
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* foo.push(bar);
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* foo.push(baz);
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* foo.push(qux);
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*
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* console.log(foo.last.type) // 'qux'
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* ```
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* @return {Object} The last node, or undefiend
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* @api public
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*/
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Object.defineProperty(Node.prototype, 'scope', {
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get: function() {
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if (this.isScope !== true) {
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return this.parent ? this.parent.scope : this;
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}
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return this;
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}
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});
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/**
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* Get own property names from Node prototype, but only the
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* first time `Node` is instantiated
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*/
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function lazyKeys() {
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if (!ownNames) {
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ownNames = Object.getOwnPropertyNames(Node.prototype);
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}
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}
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/**
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* Simplified assertion. Throws an error is `val` is falsey.
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*/
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function assert(val, message) {
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if (!val) throw new Error(message);
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}
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/**
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* Expose `Node`
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*/
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exports = module.exports = Node;
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