/**
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* 编译模板
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* 2012-6-6 @TooBug: define 方法名改为 compile，与 Node Express 保持一致
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* @name template.compile
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* @param {String} 模板字符串
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* @param {Object} 编译选项
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*
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* - openTag {String}
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* - closeTag {String}
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* - filename {String}
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* - escape {Boolean}
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* - compress {Boolean}
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* - debug {Boolean}
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* - cache {Boolean}
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* - parser {Function}
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*
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* @return {Function} 渲染方法
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*/
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var compile = template.compile = function (source, options) {
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// 合并默认配置
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options = options || {};
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for (var name in defaults) {
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if (options[name] === undefined) {
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options[name] = defaults[name];
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}
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}
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var filename = options.filename;
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try {
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var Render = compiler(source, options);
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} catch (e) {
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e.filename = filename || 'anonymous';
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e.name = 'Syntax Error';
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return showDebugInfo(e);
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}
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// 对编译结果进行一次包装
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function render (data) {
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try {
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return new Render(data, filename) + '';
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} catch (e) {
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// 运行时出错后自动开启调试模式重新编译
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if (!options.debug) {
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options.debug = true;
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return compile(source, options)(data);
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}
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return showDebugInfo(e)();
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}
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}
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render.prototype = Render.prototype;
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render.toString = function () {
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return Render.toString();
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};
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if (filename && options.cache) {
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cacheStore[filename] = render;
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}
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return render;
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};
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// 数组迭代
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var forEach = utils.$each;
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// 静态分析模板变量
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var KEYWORDS =
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// 关键字
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'break,case,catch,continue,debugger,default,delete,do,else,false'
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+ ',finally,for,function,if,in,instanceof,new,null,return,switch,this'
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+ ',throw,true,try,typeof,var,void,while,with'
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// 保留字
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+ ',abstract,boolean,byte,char,class,const,double,enum,export,extends'
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+ ',final,float,goto,implements,import,int,interface,long,native'
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+ ',package,private,protected,public,short,static,super,synchronized'
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+ ',throws,transient,volatile'
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// ECMA 5 - use strict
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+ ',arguments,let,yield'
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+ ',undefined';
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var REMOVE_RE = /\/\*[\w\W]*?\*\/|\/\/[^\n]*\n|\/\/[^\n]*$|"(?:[^"\\]|\\[\w\W])*"|'(?:[^'\\]|\\[\w\W])*'|\s*\.\s*[$\w\.]+/g;
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var SPLIT_RE = /[^\w$]+/g;
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var KEYWORDS_RE = new RegExp(["\\b" + KEYWORDS.replace(/,/g, '\\b|\\b') + "\\b"].join('|'), 'g');
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var NUMBER_RE = /^\d[^,]*|,\d[^,]*/g;
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var BOUNDARY_RE = /^,+|,+$/g;
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var SPLIT2_RE = /^$|,+/;
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// 获取变量
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function getVariable (code) {
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return code
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.replace(REMOVE_RE, '')
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.replace(SPLIT_RE, ',')
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.replace(KEYWORDS_RE, '')
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.replace(NUMBER_RE, '')
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.replace(BOUNDARY_RE, '')
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.split(SPLIT2_RE);
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};
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// 字符串转义
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function stringify (code) {
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return "'" + code
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// 单引号与反斜杠转义
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.replace(/('|\\)/g, '\\$1')
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// 换行符转义(windows + linux)
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.replace(/\r/g, '\\r')
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.replace(/\n/g, '\\n') + "'";
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}
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function compiler (source, options) {
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var debug = options.debug;
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var openTag = options.openTag;
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var closeTag = options.closeTag;
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var parser = options.parser;
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var compress = options.compress;
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var escape = options.escape;
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var line = 1;
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var uniq = {$data:1,$filename:1,$utils:1,$helpers:1,$out:1,$line:1};
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var isNewEngine = ''.trim;// '__proto__' in {}
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var replaces = isNewEngine
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? ["$out='';", "$out+=", ";", "$out"]
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: ["$out=[];", "$out.push(", ");", "$out.join('')"];
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var concat = isNewEngine
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? "$out+=text;return $out;"
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: "$out.push(text);";
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var print = "function(){"
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+ "var text=''.concat.apply('',arguments);"
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+ concat
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+ "}";
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var include = "function(filename,data){"
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+ "data=data||$data;"
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+ "var text=$utils.$include(filename,data,$filename);"
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+ concat
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+ "}";
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var headerCode = "'use strict';"
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+ "var $utils=this,$helpers=$utils.$helpers,"
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+ (debug ? "$line=0," : "");
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var mainCode = replaces[0];
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var footerCode = "return new String(" + replaces[3] + ");"
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// html与逻辑语法分离
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forEach(source.split(openTag), function (code) {
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code = code.split(closeTag);
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var $0 = code[0];
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var $1 = code[1];
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// code: [html]
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if (code.length === 1) {
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mainCode += html($0);
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// code: [logic, html]
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} else {
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mainCode += logic($0);
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if ($1) {
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mainCode += html($1);
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}
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}
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});
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var code = headerCode + mainCode + footerCode;
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// 调试语句
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if (debug) {
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code = "try{" + code + "}catch(e){"
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+ "throw {"
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+ "filename:$filename,"
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+ "name:'Render Error',"
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+ "message:e.message,"
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+ "line:$line,"
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+ "source:" + stringify(source)
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+ ".split(/\\n/)[$line-1].replace(/^\\s+/,'')"
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+ "};"
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+ "}";
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}
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try {
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var Render = new Function("$data", "$filename", code);
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Render.prototype = utils;
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return Render;
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} catch (e) {
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e.temp = "function anonymous($data,$filename) {" + code + "}";
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throw e;
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}
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// 处理 HTML 语句
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function html (code) {
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// 记录行号
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line += code.split(/\n/).length - 1;
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// 压缩多余空白与注释
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if (compress) {
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code = code
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.replace(/\s+/g, ' ')
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.replace(/<!--[\w\W]*?-->/g, '');
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}
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if (code) {
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code = replaces[1] + stringify(code) + replaces[2] + "\n";
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}
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return code;
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}
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// 处理逻辑语句
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function logic (code) {
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var thisLine = line;
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if (parser) {
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// 语法转换插件钩子
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code = parser(code, options);
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} else if (debug) {
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// 记录行号
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code = code.replace(/\n/g, function () {
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line ++;
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return "$line=" + line + ";";
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});
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}
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// 输出语句. 编码: <%=value%> 不编码:<%=#value%>
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// <%=#value%> 等同 v2.0.3 之前的 <%==value%>
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if (code.indexOf('=') === 0) {
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var escapeSyntax = escape && !/^=[=#]/.test(code);
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code = code.replace(/^=[=#]?|[\s;]*$/g, '');
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// 对内容编码
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if (escapeSyntax) {
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var name = code.replace(/\s*\([^\)]+\)/, '');
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// 排除 utils.* | include | print
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if (!utils[name] && !/^(include|print)$/.test(name)) {
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code = "$escape(" + code + ")";
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}
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// 不编码
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} else {
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code = "$string(" + code + ")";
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}
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code = replaces[1] + code + replaces[2];
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}
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if (debug) {
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code = "$line=" + thisLine + ";" + code;
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}
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// 提取模板中的变量名
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forEach(getVariable(code), function (name) {
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// name 值可能为空，在安卓低版本浏览器下
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if (!name || uniq[name]) {
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return;
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}
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var value;
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// 声明模板变量
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// 赋值优先级:
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// [include, print] > utils > helpers > data
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if (name === 'print') {
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value = print;
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} else if (name === 'include') {
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value = include;
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} else if (utils[name]) {
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value = "$utils." + name;
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} else if (helpers[name]) {
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value = "$helpers." + name;
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} else {
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value = "$data." + name;
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}
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headerCode += name + "=" + value + ",";
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uniq[name] = true;
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});
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return code + "\n";
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}
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};
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