/
conditionals.js
61 lines (51 loc) · 1.4 KB
/
conditionals.js
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/**
* Module dependencies.
*/
var jade = require('./../lib/jade'),
Compiler = jade.Compiler,
nodes = jade.nodes;
var options = {
locals: {
name: 'tj',
email: 'tj@vision-media.ca',
admin: true
}
};
jade.renderFile(__dirname + '/conditionals.jade', options, function(err, html){
if (err) throw err;
console.log(html);
});
jade.filters.conditionals = function(block, compiler){
return new Visitor(block).compile();
};
function Visitor(node) {
this.node = node;
}
Visitor.prototype.__proto__ = Compiler.prototype;
Visitor.prototype.visit = function(node){
if (node.name != 'else') this.line(node);
this.visitNode(node);
};
Visitor.prototype.visitTag = function(node){
switch (node.name) {
case 'if':
var condition = node.text[0],
block = node.block;
if ('?' == condition[condition.length-1]) {
condition = condition.slice(0, -1);
}
node = new nodes.Code('if (' + condition + ')');
node.block = block;
this.visit(node);
break;
case 'else':
var block = node.block;
node = new nodes.Code('else');
node.block = block;
node.instrumentLineNumber = false;
this.visit(node);
break;
default:
Compiler.prototype.visitTag.call(this, node);
}
};