JavaScript具有类似Lambda表达式编程能力的代码(改进版)

复制代码 代码如下:

eval(function () {
var s = '', ww = [v] > (s += v);
var ws = [n] > ww(' <A href="#">(' + n + ')</A> ');
pnView3(14, [n] > ww(' [' + n + '] '),
1, 37,
ws, [] > ww(' ... '),
2, 1
);
document.write(s);
} .lamda0());

复制代码 代码如下:

function(a, b){ a == b }

复制代码 代码如下:

[a, b] > (a == b)

复制代码 代码如下:

/*!
L-amda "a-Lambda", a module provides Alternate "Lambda" style programming ability for JavaScript.
Created By NanaLich. 2010-09-10
This module is published under WTFPL v2, so you just DO WHAT THE Fxxx YOU WANT TO with it.
*/
!function () {
function attachEntry(o, a, m) {
var i, j, n;
o = [].concat(o);
while (i = o.shift()) {
for (j in a) {
if (!i[n = a[j]]) i[n] = m;
}
}
}
var xx = /"(?:\\[\s\S]|[^\x22])*"|'(?:\\[\s\S]|[^\x27])*'|([^\s\w]\s*)\[(\s*|\s*[A-Z$_][\w$]*\s*(?:,\s*[A-Z$_][\w$]*\s*)*)\]\s*(>)\s*(\(?)/gi;
var xy = /[\n\r),;\]}]|$/.source;
function rxClone(rx) {
return new RegExp(rx.source, (rx.global ? 'g' : '') + (rx.ignoreCase ? 'i' : '') + (rx.multiline ? 'm' : ''));
}
attachEntry(RegExp, ['clone'], rxClone);
attachEntry(RegExp.prototype, ['clone'], function () { return rxClone(this); });
function translateLambda(s) {
var m, l = 0, r = '', x = xx.clone(); // 由于firefox、safari等浏览器对全局匹配正则表达式有过度的优化，所以这里采用一种迂回的办法创建不重复的正则表达式实例
while (m = x.exec(s)) {
var h = m[0];
switch (h.charAt(0)) { // 判断期待的语法成分
case '$': // 函数传参
case ')':
case ']':
case '"': // 匹配到了字符串
case "'":
continue; // 以上皆跳过
}
var p, q, t, k = m[4].length, y = new RegExp(k ? '\\)' : xy, 'g');
r += s.substring(l, p = m.index); // 在结果字符串上附加之前余留的内容
y.lastIndex = l = p + h.length; // 从伪运算符之后开始寻找右括号或者其它符号
while (q = y.exec(s)) {
q = q.index;
try {
t = 'return(' + s.substring(l, q) + ');';
new Function(t); // 语法测试
r += m[1] + 'function(' + m[2] + '){ ' + translateLambda(t) + ' }'; // 翻译里面的内容
x.lastIndex = l = q + k; // 下一次查找从当前边界之后开始
break;
} catch (ex) { }
}
if (!q) l = p; // 说明找不到右括号或者有效的代码，直接附加所有匹配的内容
}
try {
r += s.substr(l);
new Function(r); // 语法测试
return r;
} catch (ex) { // 失败，返回原文
return s;
}
};
var lamdaAliases = ["translateLambda", "lambda", "lamda"];
attachEntry(String, lamdaAliases, translateLambda);
attachEntry(String.prototype, lamdaAliases, function () { return translateLambda(this); });
var funPrototype = Function.prototype;
attachEntry(Function, lamdaAliases, function (func) { return translateLambda('0,' + func); });
attachEntry(funPrototype, lamdaAliases, function () { return translateLambda('0,' + this); });
var lamda0aliases = ['lambdaInit', 'lambda0', 'lamda0'];
attachEntry(Function, lamda0aliases, function (func) { return translateLambda('!' + func + '()'); });
attachEntry(funPrototype, lamda0aliases, function () { return translateLambda('!' + this + '()'); });
} ();