seajs-css less 加载

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(function(){
    /**
     * util-request.js - The utilities for requesting script and style files
     * ref: tests/research/load-js-css/test.html
     */

    function isType(type) {
        return function(obj) {
            return {}.toString.call(obj) == "[object " + type + "]"
        }
    }

    var isString = isType("String")

    var doc = document
    var head = doc.head || doc.getElementsByTagName("head")[0] || doc.documentElement
    var baseElement = head.getElementsByTagName("base")[0]

    var IS_CSS_RE = /\.css(?:\?|$)/i
    var IS_LESS_RE = /\.less(?:\?|$)/i
    var currentlyAddingScript
    var interactiveScript

// `onload` event is not supported in WebKit < 535.23 and Firefox < 9.0
// ref:
//  - https://bugs.webkit.org/show_activity.cgi?id=38995
//  - https://bugzilla.mozilla.org/show_bug.cgi?id=185236
//  - https://developer.mozilla.org/en/HTML/Element/link#Stylesheet_load_events
    var isOldWebKit = +navigator.userAgent
        .replace(/.*(?:AppleWebKit|AndroidWebKit)\/?(\d+).*/i, "$1") < 536

    function isFunction(obj) {
        return {}.toString.call(obj) == "[object Function]"
    }
    function request(url, callback, charset, crossorigin) {
        var isLESS = IS_LESS_RE.test(url)
        var isCSS = isLESS?isLESS:IS_CSS_RE.test(url)

        var node = doc.createElement((isCSS || isLESS) ? "link" : "script")

        if (charset) {
            var cs = isFunction(charset) ? charset(url) : charset
            if (cs) {
                node.charset = cs
            }
        }

        if (crossorigin !== void 0) {
            node.setAttribute("crossorigin", crossorigin)
        }

        addOnload(node, callback, isCSS, url)

        if (isCSS) {
            node.rel = "stylesheet"
            node.href = url
        }
        else {
            node.async = true
            node.src = url
        }
        if(url.indexOf("aaa.less.js") !=-1){
            url = url;
        }
        if(isLESS){
            node.rel="stylesheet/less"
        }

        // For some cache cases in IE 6-8, the script executes IMMEDIATELY after
        // the end of the insert execution, so use `currentlyAddingScript` to
        // hold current node, for deriving url in `define` call
        currentlyAddingScript = node

        // ref: #185 & http://dev.jquery.com/ticket/2709
        baseElement ?
            head.insertBefore(node, baseElement) :
            head.appendChild(node)

        currentlyAddingScript = null
    }

    function addOnload(node, callback, isCSS, url) {
        var supportOnload = "onload" in node

        // for Old WebKit and Old Firefox
        if (isCSS && (isOldWebKit || !supportOnload)) {
            setTimeout(function() {
                pollCss(node, callback)
            }, 1) // Begin after node insertion
            return
        }

        if (supportOnload) {
            node.onload = onload
            node.onerror = function() {
                seajs.emit("error", { uri: url, node: node })
                onload()
            }
        }
        else {
            node.onreadystatechange = function() {
                if (/loaded|complete/.test(node.readyState)) {
                    onload()
                }
            }
        }

        function onload() {
            // Ensure only run once and handle memory leak in IE
            node.onload = node.onerror = node.onreadystatechange = null

            // Remove the script to reduce memory leak
            if (!isCSS && !seajs.data.debug) {
                head.removeChild(node)
            }

            // Dereference the node
            node = null

            callback()
        }
    }

    function pollCss(node, callback) {
        var sheet = node.sheet
        var isLoaded

        // for WebKit < 536
        if (isOldWebKit) {
            if (sheet) {
                isLoaded = true
            }
        }
        // for Firefox < 9.0
        else if (sheet) {
            try {
                if (sheet.cssRules) {
                    isLoaded = true
                }
            } catch (ex) {
                // The value of `ex.name` is changed from "NS_ERROR_DOM_SECURITY_ERR"
                // to "SecurityError" since Firefox 13.0. But Firefox is less than 9.0
                // in here, So it is ok to just rely on "NS_ERROR_DOM_SECURITY_ERR"
                if (ex.name === "NS_ERROR_DOM_SECURITY_ERR") {
                    isLoaded = true
                }
            }
        }

        setTimeout(function() {
            if (isLoaded) {
                // Place callback here to give time for style rendering
                callback()
            }
            else {
                pollCss(node, callback)
            }
        }, 20)
    }


// For Developers
    seajs.request = request



    /**
     * util-path.js - The utilities for operating path such as id, uri
     */
    var data = seajs.data

    var DIRNAME_RE = /[^?#]*\//

    var DOT_RE = /\/\.\//g
    var DOUBLE_DOT_RE = /\/[^/]+\/\.\.\//
    var MULTI_SLASH_RE = /([^:/])\/+\//g

// Extract the directory portion of a path
// dirname("a/b/c.js?t=123#xx/zz") ==> "a/b/"
// ref: http://jsperf.com/regex-vs-split/2
    function dirname(path) {
        return path.match(DIRNAME_RE)[0]
    }

// Canonicalize a path
// realpath("http://test.com/a//./b/../c") ==> "http://test.com/a/c"
    function realpath(path) {
        // /a/b/./c/./d ==> /a/b/c/d
        path = path.replace(DOT_RE, "/")

        /*
         @author wh1100717
         a//b/c ==> a/b/c
         a///b/////c ==> a/b/c
         DOUBLE_DOT_RE matches a/b/c//../d path correctly only if replace // with / first
         */
        path = path.replace(MULTI_SLASH_RE, "$1/")

        // a/b/c/../../d  ==>  a/b/../d  ==>  a/d
        while (path.match(DOUBLE_DOT_RE)) {
            path = path.replace(DOUBLE_DOT_RE, "/")
        }

        return path
    }

// Normalize an id
// normalize("path/to/a") ==> "path/to/a.js"
// NOTICE: substring is faster than negative slice and RegExp
    function normalize(path) {
        var last = path.length - 1
        var lastC = path.charAt(last)

        // If the uri ends with `#`, just return it without ‘#‘
        if (lastC === "#") {
            return path.substring(0, last)
        }

        return (path.substring(last - 2) === ".js" ||
            path.indexOf("?") > 0 ||
            path.substring(last - 3) === ".css" ||
            path.substring(last - 4) === ".less" ||
            lastC === "/") ? path : path + ".js"
    }


    var PATHS_RE = /^([^/:]+)(\/.+)$/
    var VARS_RE = /{([^{]+)}/g

    function parseAlias(id) {
        var alias = data.alias
        return alias && isString(alias[id]) ? alias[id] : id
    }

    function parsePaths(id) {
        var paths = data.paths
        var m

        if (paths && (m = id.match(PATHS_RE)) && isString(paths[m[1]])) {
            id = paths[m[1]] + m[2]
        }

        return id
    }

    function parseVars(id) {
        var vars = data.vars

        if (vars && id.indexOf("{") > -1) {
            id = id.replace(VARS_RE, function(m, key) {
                return isString(vars[key]) ? vars[key] : m
            })
        }

        return id
    }

    function parseMap(uri) {
        var map = data.map
        var ret = uri

        if (map) {
            for (var i = 0, len = map.length; i < len; i++) {
                var rule = map[i]

                ret = isFunction(rule) ?
                    (rule(uri) || uri) :
                    uri.replace(rule[0], rule[1])

                // Only apply the first matched rule
                if (ret !== uri) break
            }
        }

        return ret
    }


    var ABSOLUTE_RE = /^\/\/.|:\//
    var ROOT_DIR_RE = /^.*?\/\/.*?\//

    function addBase(id, refUri) {
        var ret
        var first = id.charAt(0)

        // Absolute
        if (ABSOLUTE_RE.test(id)) {
            ret = id
        }
        // Relative
        else if (first === ".") {
            ret = realpath((refUri ? dirname(refUri) : data.cwd) + id)
        }
        // Root
        else if (first === "/") {
            var m = data.cwd.match(ROOT_DIR_RE)
            ret = m ? m[0] + id.substring(1) : id
        }
        // Top-level
        else {
            ret = data.base + id
        }

        // Add default protocol when uri begins with "//"
        if (ret.indexOf("//") === 0) {
            ret = location.protocol + ret
        }

        return ret
    }

    function id2Uri(id, refUri) {
        if (!id) return ""

        id = parseAlias(id)
        id = parsePaths(id)
        id = parseVars(id)
        id = normalize(id)

        var uri = addBase(id, refUri)
        uri = parseMap(uri)

        return uri
    }


    var doc = document
    var cwd = (!location.href || location.href.indexOf(‘about:‘) === 0) ? ‘‘ : dirname(location.href)
    var scripts = doc.scripts

// Recommend to add `seajsnode` id for the `sea.js` script element
    var loaderScript = doc.getElementById("seajsnode") ||
        scripts[scripts.length - 1]

// When `sea.js` is inline, set loaderDir to current working directory
    var loaderDir = dirname(getScriptAbsoluteSrc(loaderScript) || cwd)

    function getScriptAbsoluteSrc(node) {
        return node.hasAttribute ? // non-IE6/7
            node.src :
            // see http://msdn.microsoft.com/en-us/library/ms536429(VS.85).aspx
            node.getAttribute("src", 4)
    }


// For Developers
    seajs.resolve = id2Uri


    define("seajs/seajs-css/1.0.5/seajs-css-debug", [], {});
})();

seajs-css less 加载

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原文地址：http://my.oschina.net/wjgood/blog/487806