aaac7fed
 liuqimichale
add
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'use strict';
var extend = require('extend-shallow');
var Snapdragon = require('snapdragon');
var compilers = require('./compilers');
var parsers = require('./parsers');
var utils = require('./utils');
/**
* Customize Snapdragon parser and renderer
*/
function Braces(options) {
this.options = extend({}, options);
}
/**
* Initialize braces
*/
Braces.prototype.init = function(options) {
if (this.isInitialized) return;
this.isInitialized = true;
var opts = utils.createOptions({}, this.options, options);
this.snapdragon = this.options.snapdragon || new Snapdragon(opts);
this.compiler = this.snapdragon.compiler;
this.parser = this.snapdragon.parser;
compilers(this.snapdragon, opts);
parsers(this.snapdragon, opts);
/**
* Call Snapdragon `.parse` method. When AST is returned, we check to
* see if any unclosed braces are left on the stack and, if so, we iterate
* over the stack and correct the AST so that compilers are called in the correct
* order and unbalance braces are properly escaped.
*/
utils.define(this.snapdragon, 'parse', function(pattern, options) {
var parsed = Snapdragon.prototype.parse.apply(this, arguments);
this.parser.ast.input = pattern;
var stack = this.parser.stack;
while (stack.length) {
addParent({type: 'brace.close', val: ''}, stack.pop());
}
function addParent(node, parent) {
utils.define(node, 'parent', parent);
parent.nodes.push(node);
}
// add non-enumerable parser reference
utils.define(parsed, 'parser', this.parser);
return parsed;
});
};
/**
* Decorate `.parse` method
*/
Braces.prototype.parse = function(ast, options) {
if (ast && typeof ast === 'object' && ast.nodes) return ast;
this.init(options);
return this.snapdragon.parse(ast, options);
};
/**
* Decorate `.compile` method
*/
Braces.prototype.compile = function(ast, options) {
if (typeof ast === 'string') {
ast = this.parse(ast, options);
} else {
this.init(options);
}
return this.snapdragon.compile(ast, options);
};
/**
* Expand
*/
Braces.prototype.expand = function(pattern) {
var ast = this.parse(pattern, {expand: true});
return this.compile(ast, {expand: true});
};
/**
* Optimize
*/
Braces.prototype.optimize = function(pattern) {
var ast = this.parse(pattern, {optimize: true});
return this.compile(ast, {optimize: true});
};
/**
* Expose `Braces`
*/
module.exports = Braces;
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