parseURI: XMLHttpClient 第２引数 に用いる配列（[ url, body, headers ]）に整形する関数

gistfile1.js

// "httpRequest" [ url, body, headers ]
//  httpRequest = parseURI(method, uri);

function _parseQuery (uriObj) {
    var buf = [];
    if (! uriObj) return null;
    if (typeof uriObj === 'string') return uriObj;
    if (typeof uriObj === 'object') {
        if (uriObj.length && uriObj.length > 0) {
            uriObj.foreach(function (keyVal, i) {
                buf.push([ keyVal[0], encodeURIComponent(keyVal[1]) ].join('='));
            });
            return buf.join('&');
        }
        if (uriObj) {
            for (var key in uriObj) {
                buf.push([ key, encodeURIComponent(uriObj[key]) ].join('='));
            }
            return buf.join('&');
        }
    }
    return null;
}
function _parseURI1 (method) {
    if (method === 'POST') {
        if (this[0].match(/\?/)) {
            var buf  = this[0].split(/\?/);
            this[0] = buf[0];
            this[1] = buf[1];
        }
    }
}
function _parseURI2 (method) {
    // this[1] == null 以外は、stringに直し、method === 'POST' -> body, method === 'GET' -> urlに追加
    var buf = _parseQuery(this[1]);
    if (method === 'POST') {
        this[1] = buf;
    } else {
        this[1] = null;
        this[0] = (buf) ? [ this[0], buf ].join((buf.match(/^\?/)) ? '' : '?') : this[0];
    }
}
function parseURI (method, uri) {
    if (! method) return { error : '"method" not found' };
    if (! uri)    return { error : '"uri object" not found' };

    method = (method.match(/^post/i)) ? 'POST' : 'GET';

    var url, body = null, headers = {}, uriObj = [ url, body, headers ];
    
    if (typeof uri === 'string') {
        uriObj[0] = uri;
        _parseURI1.apply(uriObj, [ method ]);
        return uriObj;
    }

    if (! uri.length) return { error : 'uri must be "string" or "array"' };
    if (typeof uri[0] !== 'string') return { error : '"url" must be "string"' };

    uriObj[0] = uri[0];
    _parseURI1.apply(uriObj, [ method ]);

    uriObj[1] = uri[1] || uriObj[1];
    _parseURI2.apply(uriObj, [ method ]);

    uriObj[2] = uri[2] || {};
    return uriObj;
}

function test (resFunc, forecast) {
    resFunc  = JSON.stringify(resFunc);
    forecast = JSON.stringify(forecast);
    console.log(
        (resFunc == forecast)
      ? [ 'success', resFunc ].join(" --- ") 
      : [ '!failed', resFunc, forecast ].join(" --- ")
    );
}

if (! Array.prototype.foreach) {
    Array.prototype.foreach = function (func) {
        foreach.apply(null, [ this, func ]);
    };
}
function foreach (arry, func) {
    var i = 0, len = arry.length;
    for (; i < len; i+=1) {
        func(arry[i], i);
    }
}


// TEST

console.log('method === "GET"');
var method = 'GET';
test(parseURI(),       { error : '"method" not found' });
test(parseURI(method), { error : '"uri object" not found' });

test(parseURI(method, "/tora"),       [ '/tora',       null, {} ]);
test(parseURI(method, "/tora?q=abc"), [ '/tora?q=abc', null, {} ]);

test(parseURI(method, []), { error : 'uri must be "string" or "array"' });

test(parseURI(method, [ "/tora" ]),       [ '/tora',       null, {} ]);
test(parseURI(method, [ "/tora?q=abc" ]), [ '/tora?q=abc', null, {} ]);

console.log('\narguments.length === 2');
test(parseURI(method, [ "/tora", "q=abc&qq=xyz" ]),               [ '/tora?q=abc&qq=xyz', null, {} ]);
test(parseURI(method, [ "/tora", { q : 'abc', qq : 'xyz' } ]),    [ '/tora?q=abc&qq=xyz', null, {} ]);
test(parseURI(method, [ "/tora", [["q", "abc"],["qq", "xyz"]] ]), [ '/tora?q=abc&qq=xyz', null, {} ]);
test(parseURI(method, [ "/tora?q=abc&qq=xyz", null ]),            [ '/tora?q=abc&qq=xyz', null, {} ]);

console.log('\narguments.length === 3');
var headers = { 'Connection' : 'keep-alive', 'X-header' : 'heaven' };
test(parseURI(method, [ "/tora", "q=abc&qq=xyz",               headers ]), [ '/tora?q=abc&qq=xyz', null, headers ]);
test(parseURI(method, [ "/tora", { q : 'abc', qq : 'xyz' },    headers ]), [ '/tora?q=abc&qq=xyz', null, headers ]);
test(parseURI(method, [ "/tora", [["q", "abc"],["qq", "xyz"]], headers ]), [ '/tora?q=abc&qq=xyz', null, headers ]);
test(parseURI(method, [ "/tora?q=abc&qq=xyz", null,            headers ]), [ '/tora?q=abc&qq=xyz', null, headers ]);


console.log('\nmethod === "POST"');
var method = 'POST';
test(parseURI(), { error : '"method" not found' });
test(parseURI(method), { error : '"uri object" not found' });

test(parseURI(method, "/tora"),       [ '/tora', null,    {} ]);
test(parseURI(method, "/tora?q=abc"), [ '/tora', 'q=abc', {} ]);

test(parseURI(method, []), { error : 'uri must be "string" or "array"' });

test(parseURI(method, [ "/tora" ]),       [ '/tora', null,    {} ]);
test(parseURI(method, [ "/tora?q=abc" ]), [ '/tora', 'q=abc', {} ]);

console.log('\narguments.length === 2');
test(parseURI(method, [ "/tora", "q=abc&qq=xyz" ]),               [ '/tora', 'q=abc&qq=xyz', {} ]);
test(parseURI(method, [ "/tora", { q : 'abc', qq : 'xyz' } ]),    [ '/tora', 'q=abc&qq=xyz', {} ]);
test(parseURI(method, [ "/tora", [["q", "abc"],["qq", "xyz"]] ]), [ '/tora', 'q=abc&qq=xyz', {} ]);
test(parseURI(method, [ "/tora?q=abc&qq=xyz", null ]),            [ '/tora', 'q=abc&qq=xyz', {} ]);

console.log('\narguments.length === 3');
var headers = { 'Connection' : 'keep-alive', 'X-header' : 'heaven' };
test(parseURI(method, [ "/tora", "q=abc&qq=xyz",               headers ]), [ '/tora', 'q=abc&qq=xyz', headers ]);
test(parseURI(method, [ "/tora", { q : 'abc', qq : 'xyz' },    headers ]), [ '/tora', 'q=abc&qq=xyz', headers ]);
test(parseURI(method, [ "/tora", [["q", "abc"],["qq", "xyz"]], headers ]), [ '/tora', 'q=abc&qq=xyz', headers ]);
test(parseURI(method, [ "/tora?q=abc&qq=xyz", null,            headers ]), [ '/tora', 'q=abc&qq=xyz', headers ]);