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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* Any copyright is dedicated to the Public Domain.
* http://creativecommons.org/licenses/publicdomain/
*/
// The Worker constructor can take a relative URL, but different test runners
// run in different enough environments that it doesn't all just automatically
// work. For the shell, we use just a filename; for the browser, see browser.js.
var workerDir = '';
// explicitly turn on js185
// XXX: The browser currently only supports up to version 1.8
if (typeof version != 'undefined')
{
version(185);
}
// A little pattern-matching library.
var Match =
(function() {
function Pattern(template) {
// act like a constructor even as a function
if (!(this instanceof Pattern))
return new Pattern(template);
this.template = template;
}
Pattern.prototype = {
match: function(act) {
return match(act, this.template);
},
matches: function(act) {
try {
return this.match(act);
}
catch (e if e instanceof MatchError) {
return false;
}
},
assert: function(act, message) {
try {
return this.match(act);
}
catch (e if e instanceof MatchError) {
throw new Error((message || "failed match") + ": " + e.message);
}
},
toString: function() "[object Pattern]"
};
Pattern.ANY = new Pattern;
Pattern.ANY.template = Pattern.ANY;
var quote = uneval;
function MatchError(msg) {
this.message = msg;
}
MatchError.prototype = {
toString: function() {
return "match error: " + this.message;
}
};
function isAtom(x) {
return (typeof x === "number") ||
(typeof x === "string") ||
(typeof x === "boolean") ||
(x === null) ||
(typeof x === "object" && x instanceof RegExp);
}
function isObject(x) {
return (x !== null) && (typeof x === "object");
}
function isArrayLike(x) {
return isObject(x) && ("length" in x);
}
function matchAtom(act, exp) {
if ((typeof exp) === "number" && isNaN(exp)) {
if ((typeof act) !== "number" || !isNaN(act))
throw new MatchError("expected NaN, got: " + quote(act));
return true;
}
if (exp === null) {
if (act !== null)
throw new MatchError("expected null, got: " + quote(act));
return true;
}
if (exp instanceof RegExp) {
if (!(act instanceof RegExp) || exp.source !== act.source)
throw new MatchError("expected " + quote(exp) + ", got: " + quote(act));
return true;
}
switch (typeof exp) {
case "string":
if (act !== exp)
throw new MatchError("expected " + exp.quote() + ", got " + quote(act));
return true;
case "boolean":
case "number":
if (exp !== act)
throw new MatchError("expected " + exp + ", got " + quote(act));
return true;
}
throw new Error("bad pattern: " + exp.toSource());
}
function matchObject(act, exp) {
if (!isObject(act))
throw new MatchError("expected object, got " + quote(act));
for (var key in exp) {
if (!(key in act))
throw new MatchError("expected property " + key.quote() + " not found in " + quote(act));
match(act[key], exp[key]);
}
return true;
}
function matchArray(act, exp) {
if (!isObject(act) || !("length" in act))
throw new MatchError("expected array-like object, got " + quote(act));
var length = exp.length;
for (var i = 0; i < length; i++) {
if (i in exp) {
if (!(i in act))
throw new MatchError("expected array property " + i + " not found in " + quote(act));
match(act[i], exp[i]);
}
}
return true;
}
function match(act, exp) {
if (exp === Pattern.ANY)
return true;
if (exp instanceof Pattern)
return exp.match(act);
if (isAtom(exp))
return matchAtom(act, exp);
if (isArrayLike(exp))
return matchArray(act, exp);
return matchObject(act, exp);
}
return { Pattern: Pattern,
MatchError: MatchError };
})();
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