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Diffstat (limited to 'utils/lib/mime.js')
| -rwxr-xr-x | utils/lib/mime.js | 166 |
1 files changed, 0 insertions, 166 deletions
diff --git a/utils/lib/mime.js b/utils/lib/mime.js deleted file mode 100755 index bbc22ff..0000000 --- a/utils/lib/mime.js +++ /dev/null @@ -1,166 +0,0 @@ -/** - 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 util = require("util"); - -/*** parseMimeType - 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" }] -*/ -exports.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[util.trim(p[0])] = util.trim(p[1]); - } - }; - fullType = parts[0].replace(/^\s+/, '').replace(/\s+$/, ''); - if (fullType == '*') fullType = '*/*'; - typeParts = fullType.split('/'); - return [typeParts[0], typeParts[1], params]; -}; - -/*** parseMediaRange - 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. -*/ -exports.parseMediaRange = function (range) { - var q, parsedType = exports.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; -}; - -/*** fitnessAndQualityParsed - 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. -*/ -exports.fitnessAndQualityParsed = function (mimeType, parsedRanges) { - var bestFitness = -1, bestFitQ = 0, target = exports.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)]; -}; - -/*** qualityParsed - 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. -*/ -exports.qualityParsed = function (mimeType, parsedRanges) { - return exports.fitnessAndQualityParsed(mimeType, parsedRanges)[1]; -}; - -/*** quality - 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 -*/ -exports.quality = function (mimeType, ranges) { - return exports.qualityParsed(mimeType, parseRanges(ranges)); -}; - -/*** bestMatch - 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' -*/ -exports.bestMatch = function (supported, header) { - var parsedHeader = parseRanges(header); - var weighted = []; - for (var i=0; i < supported.length; i++) { - weighted.push([ - exports.fitnessAndQualityParsed(supported[i], parsedHeader), - supported[i] - ]) - }; - weighted.sort(); - return weighted[weighted.length-1][0][1] ? weighted[weighted.length-1][1] : ''; -}; - -function parseRanges(ranges) { - var parsedRanges = [], rangeParts = ranges.split(","); - for (var i=0; i < rangeParts.length; i++) { - parsedRanges.push(exports.parseMediaRange(rangeParts[i])); - }; - return parsedRanges; -}; - |