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authorBrad Anderson <brad@cloudant.com>2010-08-20 10:15:57 -0400
committerBrad Anderson <brad@cloudant.com>2010-08-20 10:15:57 -0400
commit906d543b0e2cb16421702ebe8b878b21415c16a0 (patch)
tree7078f119a0c08c5e242d841c5ba215a0156f18fc /rel/overlay/var/share/server/mimeparse.js
parent75a44a40776917073c87a2e2e44c9fef516364b8 (diff)
build couchjs with scons
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-// mimeparse.js
-//
-// This module provides basic functions for handling mime-types. It can
-// handle matching mime-types against a list of media-ranges. See section
-// 14.1 of the HTTP specification [RFC 2616] for a complete explanation.
-//
-// http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.1
-//
-// A port to JavaScript of Joe Gregorio's MIME-Type Parser:
-//
-// http://code.google.com/p/mimeparse/
-//
-// Ported by J. Chris Anderson <jchris@apache.org>, targeting the Spidermonkey runtime.
-//
-// To run the tests, open mimeparse-js-test.html in a browser.
-// Ported from version 0.1.2
-// Comments are mostly excerpted from the original.
-
-var Mimeparse = (function() {
- // private helpers
- function strip(string) {
- return string.replace(/^\s+/, '').replace(/\s+$/, '')
- };
-
- function parseRanges(ranges) {
- var parsedRanges = [], rangeParts = ranges.split(",");
- for (var i=0; i < rangeParts.length; i++) {
- parsedRanges.push(publicMethods.parseMediaRange(rangeParts[i]))
- };
- return parsedRanges;
- };
-
- var publicMethods = {
- // Carves up a mime-type and returns an Array of the
- // [type, subtype, params] where "params" is a Hash of all
- // the parameters for the media range.
- //
- // For example, the media range "application/xhtml;q=0.5" would
- // get parsed into:
- //
- // ["application", "xhtml", { "q" : "0.5" }]
- parseMimeType : function(mimeType) {
- var fullType, typeParts, params = {}, parts = mimeType.split(';');
- for (var i=0; i < parts.length; i++) {
- var p = parts[i].split('=');
- if (p.length == 2) {
- params[strip(p[0])] = strip(p[1]);
- }
- };
- fullType = parts[0].replace(/^\s+/, '').replace(/\s+$/, '');
- if (fullType == '*') fullType = '*/*';
- typeParts = fullType.split('/');
- return [typeParts[0], typeParts[1], params];
- },
-
- // Carves up a media range and returns an Array of the
- // [type, subtype, params] where "params" is a Object with
- // all the parameters for the media range.
- //
- // For example, the media range "application/*;q=0.5" would
- // get parsed into:
- //
- // ["application", "*", { "q" : "0.5" }]
- //
- // In addition this function also guarantees that there
- // is a value for "q" in the params dictionary, filling it
- // in with a proper default if necessary.
- parseMediaRange : function(range) {
- var q, parsedType = this.parseMimeType(range);
- if (!parsedType[2]['q']) {
- parsedType[2]['q'] = '1';
- } else {
- q = parseFloat(parsedType[2]['q']);
- if (isNaN(q)) {
- parsedType[2]['q'] = '1';
- } else if (q > 1 || q < 0) {
- parsedType[2]['q'] = '1';
- }
- }
- return parsedType;
- },
-
- // Find the best match for a given mime-type against
- // a list of media_ranges that have already been
- // parsed by parseMediaRange(). Returns an array of
- // the fitness value and the value of the 'q' quality
- // parameter of the best match, or (-1, 0) if no match
- // was found. Just as for qualityParsed(), 'parsed_ranges'
- // must be a list of parsed media ranges.
- fitnessAndQualityParsed : function(mimeType, parsedRanges) {
- var bestFitness = -1, bestFitQ = 0, target = this.parseMediaRange(mimeType);
- var targetType = target[0], targetSubtype = target[1], targetParams = target[2];
-
- for (var i=0; i < parsedRanges.length; i++) {
- var parsed = parsedRanges[i];
- var type = parsed[0], subtype = parsed[1], params = parsed[2];
- if ((type == targetType || type == "*" || targetType == "*") &&
- (subtype == targetSubtype || subtype == "*" || targetSubtype == "*")) {
- var matchCount = 0;
- for (param in targetParams) {
- if (param != 'q' && params[param] && params[param] == targetParams[param]) {
- matchCount += 1;
- }
- }
-
- var fitness = (type == targetType) ? 100 : 0;
- fitness += (subtype == targetSubtype) ? 10 : 0;
- fitness += matchCount;
-
- if (fitness > bestFitness) {
- bestFitness = fitness;
- bestFitQ = params["q"];
- }
- }
- };
- return [bestFitness, parseFloat(bestFitQ)];
- },
-
- // Find the best match for a given mime-type against
- // a list of media_ranges that have already been
- // parsed by parseMediaRange(). Returns the
- // 'q' quality parameter of the best match, 0 if no
- // match was found. This function bahaves the same as quality()
- // except that 'parsedRanges' must be a list of
- // parsed media ranges.
- qualityParsed : function(mimeType, parsedRanges) {
- return this.fitnessAndQualityParsed(mimeType, parsedRanges)[1];
- },
-
- // Returns the quality 'q' of a mime-type when compared
- // against the media-ranges in ranges. For example:
- //
- // >>> Mimeparse.quality('text/html','text/*;q=0.3, text/html;q=0.7, text/html;level=1, text/html;level=2;q=0.4, */*;q=0.5')
- // 0.7
- quality : function(mimeType, ranges) {
- return this.qualityParsed(mimeType, parseRanges(ranges));
- },
-
- // Takes a list of supported mime-types and finds the best
- // match for all the media-ranges listed in header. The value of
- // header must be a string that conforms to the format of the
- // HTTP Accept: header. The value of 'supported' is a list of
- // mime-types.
- //
- // >>> bestMatch(['application/xbel+xml', 'text/xml'], 'text/*;q=0.5,*/*; q=0.1')
- // 'text/xml'
- bestMatch : function(supported, header) {
- var parsedHeader = parseRanges(header);
- var weighted = [];
- for (var i=0; i < supported.length; i++) {
- weighted.push([publicMethods.fitnessAndQualityParsed(supported[i], parsedHeader), i, supported[i]])
- };
- weighted.sort();
- return weighted[weighted.length-1][0][1] ? weighted[weighted.length-1][2] : '';
- }
- }
- return publicMethods;
-})();