小記改用 fs.createReadStream

Zeuxis  2013-07-16  Notes

原先的模版

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l=[];
l.push('<body>');
if($.a>$.b){
	l.push('a 大於 b');
}else{
	l.push('a 小於 b');
}
l.push('</body>');
return l.join('');

原先的 fs.readFile 解釋模版方法

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var http=require('http'),
	fs=require('fs');
http.createServer(function(request,response,l){
	fs.readFile('./temp.js','utf8',function(err,temp){
		var data={a:1,b:3};
		response.end(Function('$,l',temp)(data));
	});
}).listen(8888);

經由新 fs.createReadStream 解釋模版方法

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// Load Module
var util = require('util'),
    stream = require('stream'),
	http = require('http'),
	fs = require('fs');
 
// Custom Stream
var CompileStream = function(data) {
	this.readable = true;
	this.writable = true;
	this.setDatas = data;
}
 
util.inherits(CompileStream, stream);
 
CompileStream.prototype.write = function() {
	this._parse.apply(this, arguments);
};
 
CompileStream.prototype.end = function() {
	this.emit("end");
};
 
CompileStream.prototype._parse = function(data) {
	data = data ? data.toString() : "";
 
	data = Function('$,l', data)(this.setDatas);
	
	this.emit('data', data);
};
 
CompileStream.prototype.setData = function(name, value) {
	this.setDatas[name] = value;
};
 
// Make Web Server
http.createServer(function(request, response) {
	var temp = fs.createReadStream("temp.js");
	
	temp.setEncoding("utf8");
	temp.pipe(new CompileStream({
		a: 1,
		b: 2	
	})).pipe(response);
}).listen(8888);

移除 _parse 的 fs.createReadStream 的代碼

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var CompileStream = function(data) {
	this.readable = true;
	this.writable = true;
	this.setDatas = data;
}

util.inherits(CompileStream, stream);

CompileStream.prototype.write = function() {
	var data = Array.prototype.slice.apply(arguments)[0];

	data = data ? data.toString() : "";
	data = Function('$,l', data)(this.setDatas);

	this.emit('data', data);
};

CompileStream.prototype.end = function() {
	this.emit("end");
};

CompileStream.prototype.setData = function(name, value) {
	this.setDatas[name] = value;
};

關於將 html 編譯成 js 代碼 (不完全記錄)

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<p></p>
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var util = require('util'),
    fs = require('fs'),
	readStream = fs.createReadStream("n-test.html");
	writeStream = fs.createWriteStream("test_c.txt");
 
var CompileStream = function() {
	this.readable = true;
	this.writable = true;
	this.template = 'var template = ""; template = function(data) { return "##RESLT##" }';
};
 
util.inherits(CompileStream, require('stream'));
 
CompileStream.prototype.write = function() {
	this._parse.apply(this, arguments);
};
	
CompileStream.prototype.end = function() {	
	this.emit("end");
};
 
CompileStream.prototype._parse = function(data) {
	data = data ? data.toString() : "";
	data = this.template.replace("##RESLT##", data);
	
	this.emit("data", data);
}
 
readStream.pipe(new CompileStream()).pipe(writeStream);
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