mirror of https://github.com/jkjoy/sunpeiwen.git
136 lines
2.6 KiB
JavaScript
136 lines
2.6 KiB
JavaScript
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/*!
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* Stylus - Stack
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* Copyright (c) Automattic <developer.wordpress.com>
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* MIT Licensed
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*/
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/**
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* Initialize a new `Stack`.
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*
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* @api private
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*/
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var Stack = module.exports = function Stack() {
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Array.apply(this, arguments);
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};
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/**
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* Inherit from `Array.prototype`.
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*/
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Stack.prototype.__proto__ = Array.prototype;
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/**
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* Push the given `frame`.
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*
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* @param {Frame} frame
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* @api public
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*/
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Stack.prototype.push = function(frame){
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frame.stack = this;
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frame.parent = this.currentFrame;
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return [].push.apply(this, arguments);
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};
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/**
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* Return the current stack `Frame`.
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*
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* @return {Frame}
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* @api private
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*/
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Stack.prototype.__defineGetter__('currentFrame', function(){
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return this[this.length - 1];
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});
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/**
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* Lookup stack frame for the given `block`.
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*
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* @param {Block} block
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* @return {Frame}
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* @api private
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*/
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Stack.prototype.getBlockFrame = function(block){
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for (var i = 0; i < this.length; ++i) {
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if (block == this[i].block) {
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return this[i];
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}
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}
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};
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/**
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* Lookup the given local variable `name`, relative
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* to the lexical scope of the current frame's `Block`.
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*
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* When the result of a lookup is an identifier
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* a recursive lookup is performed, defaulting to
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* returning the identifier itself.
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*
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* @param {String} name
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* @return {Node}
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* @api private
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*/
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Stack.prototype.lookup = function(name){
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var block = this.currentFrame.block
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, val
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, ret;
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do {
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var frame = this.getBlockFrame(block);
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if (frame && (val = frame.lookup(name))) {
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return val;
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}
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} while (block = block.parent);
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};
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/**
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* Custom inspect.
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*
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* @return {String}
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* @api private
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*/
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Stack.prototype.inspect = function(){
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return this.reverse().map(function(frame){
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return frame.inspect();
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}).join('\n');
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};
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/**
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* Return stack string formatted as:
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*
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* at <context> (<filename>:<lineno>:<column>)
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*
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* @return {String}
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* @api private
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*/
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Stack.prototype.toString = function(){
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var block
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, node
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, buf = []
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, location
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, len = this.length;
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while (len--) {
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block = this[len].block;
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if (node = block.node) {
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location = '(' + node.filename + ':' + (node.lineno + 1) + ':' + node.column + ')';
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switch (node.nodeName) {
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case 'function':
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buf.push(' at ' + node.name + '() ' + location);
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break;
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case 'group':
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buf.push(' at "' + node.nodes[0].val + '" ' + location);
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break;
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}
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}
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}
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return buf.join('\n');
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};
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