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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 '';
}
};
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:
if (!name) return '';
return 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' || qs.length === 0) {
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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