pistachio1.js

(function(){
//pistachio
//fear the stachio

function compile(source,opts) {
	source = String(source)
	opts = opts || {}
	var template_source = ""
	var matcher = /[{][{]([@])?([#])?([/])?([a-zA-Z_$]\w*|[.])([\[](-?\d+)?(..(-?\d+)?)?[\]])?[}][}]/g
	var index = 0
	var match;
	var need_context = false
	var need_template = false
	var need_iteration = false
	var need_locals = false
	var context_depth = 0
	var context_allocated_depth = 0
	var iteration_depth = 0
	var iteration_allocated_depth = 0
	var ender_stack=[]
        var defaulted_value = opts.default_value ? "||"+JSON.stringify(opts.default_value) : ""
	while(match = matcher.exec(source)) {
		if(index !== match.index)
			template_source += "stream.write("+JSON.stringify(source.slice(index,match.index))+");"
		var target = ""
		var obj = match[4]
		index = matcher.lastIndex
		//template
		if(match[1]) {
			need_template = true
			target = "template_table."+obj
			template_source += "tmp="+target+";"
			template_source +=
				"typeof tmp ==='function'?tmp(c0,template_table,stream):("+target+"=compile("+target+",opts))(c0,template_table,stream);"
			continue;
		}
		//with
		else if (match[2]) {
			need_context = true
			context_depth++
			if(context_depth > context_allocated_depth) context_allocated_depth = context_depth
			template_source += "c"+context_depth+"=c"+(context_depth-1)+"."+obj+";"
			ender_stack.push(false)
			continue
		}
		//close
		else if (match[3]) {
			var alter = ender_stack.pop()
			if(alter) {
				template_source += alter[0]
				context_depth -= alter[1]
			}
			else {
				context_depth--;
			}
			continue
		}
		//iteration
		else if (match[5]) {
			//start
			need_context = true
			need_iteration = true
			var start = Number(match[6]||0)
			var end = match[7] ? match[8] ? Number(match[8]) : null : start
			if(start == end) {
				context_depth++
				if(context_depth > context_allocated_depth) context_allocated_depth = context_depth
				var cindex
				if(start < 0) cindex = "c"+(context_depth-1)+"."+obj+".length"+start
				else cindex = start
				template_source += "c"+context_depth+"=c"+(context_depth-1)+"."+obj+"["+cindex+"];"
				ender_stack.push(false)
				console.log(match)
			}
			else {
				var l = "l"+iteration_depth
				var i = "i"+iteration_depth
				context_depth++
				iteration_depth++
				if(iteration_depth > iteration_allocated_depth) iteration_allocated_depth = context_depth
				if(end) {
					if(end < 0) end = "c"+context_depth+".length"+(end===null||end==0?"":end)
				}
				else {
					end = "c"+context_depth+".length"
				}
				template_source += "c"+context_depth+"=c"+(context_depth-1)+"."+obj+";";
				template_source += l+"="+end+";"
				if(start < 0) start = l+start
				context_depth++
				if(context_depth > context_allocated_depth) context_allocated_depth = context_depth
				template_source += "for("+i+"="+start+";"+i+"<"+l+";++"+i+"){"
				template_source += "c"+context_depth+"=c"+(context_depth-1)+"["+i+"];";
				ender_stack.push(["}",2])
			}
			continue
			//end 
		}
		else if (obj === ".") {
			template_source+="stream.write(c"+context_depth+defaulted_value+");"
			continue
		}
		else {
			need_locals = true
			for(var i=context_depth;i>0;i--) {
				var context_var = "c"+i
				target+="\""+obj +"\" in "+context_var+"?"+context_var+"."+obj+":";
			}
			target += "c0."+obj+""
		}
		template_source += "stream.write("+target+defaulted_value+");"
	}
	if(index !== source.length)
	template_source += "stream.write("+JSON.stringify(source.slice(index))+");"
	var pre = ""
	//if(need_locals) pre+="c0=c0||{};"
	//if(need_template) pre+="template_table=template_table||{};var tmp;"
	if(need_context) while(context_allocated_depth > 0) pre+="var c"+(context_allocated_depth--)+";"
	if(need_iteration) while(iteration_allocated_depth > 0) pre+="var i"+(iteration_allocated_depth)+";"+"var l"+(iteration_allocated_depth--)+";"
	console.log(pre+template_source)
	var render = Function("compile","opts","return function(c0,template_table,stream){"+pre+template_source+"}")(compile,opts)
	render.source = template_source
	return render
}

if(typeof module !== "undefined") module.exports = compile
if(window) window.pistachio = {compile : compile}
})()