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// Query String Utilities
var QueryString = exports;
var urlDecode = process.binding("http_parser").urlDecode;
function charCode (c) {
return c.charCodeAt(0);
}
// a safe fast alternative to decodeURIComponent
QueryString.unescapeBuffer = function (s, decodeSpaces) {
var out = new Buffer(s.length);
var state = "CHAR"; // states: CHAR, HEX0, HEX1
var n, m, hexchar;
for (var inIndex = 0, outIndex = 0; inIndex <= s.length; inIndex++) {
var c = s.charCodeAt(inIndex);
switch (state) {
case 'CHAR':
switch (c) {
case charCode('%'):
n = 0;
m = 0;
state = 'HEX0';
break;
case charCode('+'):
if (decodeSpaces) c = charCode(' ');
// pass thru
default:
out[outIndex++] = c;
break;
}
break;
case 'HEX0':
state = 'HEX1';
hexchar = c;
if (charCode('0') <= c && c <= charCode('9')) {
n = c - charCode('0');
} else if (charCode('a') <= c && c <= charCode('f')) {
n = c - charCode('a') + 10;
} else if (charCode('A') <= c && c <= charCode('F')) {
n = c - charCode('A') + 10;
} else {
out[outIndex++] = charCode('%');
out[outIndex++] = c;
state = 'CHAR';
break;
}
break;
case 'HEX1':
state = 'CHAR';
if (charCode('0') <= c && c <= charCode('9')) {
m = c - charCode('0');
} else if (charCode('a') <= c && c <= charCode('f')) {
m = c - charCode('a') + 10;
} else if (charCode('A') <= c && c <= charCode('F')) {
m = c - charCode('A') + 10;
} else {
out[outIndex++] = charCode('%');
out[outIndex++] = hexchar;
out[outIndex++] = c;
break;
}
out[outIndex++] = 16*n + m;
break;
}
}
// TODO support returning arbitrary buffers.
return out.slice(0, outIndex-1);
};
QueryString.unescape = function (s, decodeSpaces) {
return QueryString.unescapeBuffer(s, decodeSpaces).toString();
};
QueryString.escape = function (str) {
return encodeURIComponent(str);
};
var stringifyPrimitive = function(v) {
switch (typeof v) {
case "string":
return v;
case "boolean":
return v ? "true" : "false";
case "number":
return isFinite(v) ? v : "";
default:
return "";
}
};
/**
* <p>Converts an arbitrary value to a Query String representation.</p>
*
* <p>Objects with cyclical references will trigger an exception.</p>
*
* @method stringify
* @param obj {Variant} any arbitrary value to convert to query string
* @param sep {String} (optional) Character that should join param k=v pairs together. Default: "&"
* @param eq {String} (optional) Character that should join keys to their values. Default: "="
* @param name {String} (optional) Name of the current key, for handling children recursively.
* @static
*/
QueryString.stringify = QueryString.encode = function (obj, sep, eq, name) {
sep = sep || "&";
eq = eq || "=";
obj = (obj === null) ? undefined : obj;
switch (typeof obj) {
case "object":
return Object.keys(obj).map(function(k) {
if (Array.isArray(obj[k])) {
return obj[k].map(function(v) {
return QueryString.escape(stringifyPrimitive(k)) +
eq +
QueryString.escape(stringifyPrimitive(v));
}).join(sep);
} else {
return QueryString.escape(stringifyPrimitive(k)) +
eq +
QueryString.escape(stringifyPrimitive(obj[k]));
}
}).join(sep);
default:
return (name) ?
QueryString.escape(stringifyPrimitive(name)) + eq +
QueryString.escape(stringifyPrimitive(obj)) :
"";
}
};
// Parse a key=val string.
QueryString.parse = QueryString.decode = function (qs, sep, eq) {
sep = sep || "&";
eq = eq || "=";
var obj = {};
if (typeof qs !== 'string') {
return obj;
}
qs.split(sep).forEach(function(kvp) {
var x = kvp.split(eq);
var k = QueryString.unescape(x[0], true);
var v = QueryString.unescape(x.slice(1).join(eq), true);
if (!(k in obj)) {
obj[k] = v;
} else if (!Array.isArray(obj[k])) {
obj[k] = [obj[k], v];
} else {
obj[k].push(v);
}
});
return obj;
};
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