gulp-nui-concat/index.js

Nui框架模块文件合并插件

'use strict';

var through = require('through2');
var path = require('path');
var fs = require('fs');

var replacePath = function(path){
    // a\b\c => a/b/c
    path = path.replace(/\\/g, '/');

    // a///b///c => a/b/c
    path = path.replace(/([^:])\/{2,}/g, '$1/');

    // a/b...../c => a/b../c
    path = path.replace(/\.{2,}/g, '..');

    // a/b../c => a/c
    // a/../c => c
    var replace = function(str){
        if(/([\w]+\/?)(\.\.\/)/g.test(str)){
            str = str.replace(/([\w]+\/?)(\.\.\/)/g, function(a, b, c){
                if(a == b+c){
                    return ''
                }
                return a
            })
            return replace(str)
        }
        return str
    }
    path = replace(path);

    // a/b./c => a/b/c
    // a/./c => a/c
    return path.replace(/([\w]+)\/?(\.\/)+/g, '$1/')
}

var isEmptyObject = function(obj){
    var name;
    for(name in obj){
        return false;
    }
    return true;
}

var inArray = function(str, arr){
    var len = arr.length;
    var i=0;
    for(i; i<len; i++){
        if(arr[i] == str){
            return true
        }
    }
    return false
}

var unique = function(arr){
    var newarr = [];
    var temp = {};
    arr.forEach(function(val, i){
        if(!temp[val]){
            temp[val] = true
            newarr.push(val)
        }
    })
    return newarr
}

module.exports = function(options){

    options = options || {};
    //模块别名，值一定要用绝对路径
    options.alias = options.alias || {};
    //忽略的模块名，模块不会追加到合并的文件中
    options.ignore = options.ignore || [];

    return through.obj(function(file, enc, cb){

        if(file.isNull()){
	        return cb();
        }

        var dirname = path.dirname(file.path)+'/';
        var content = file.contents.toString();
        var matchs = content.match(/Nui.load\(['"][^'"]+['"]/g);
        var cacheModules = {};

        if(!matchs){
            return cb();
        }

        function Module(id, name, deps){
            var mod = this;
            mod.id = id;
            mod.name = name;
            mod.deps = deps;
            mod.depmodules = {};
            mod.uri = mod.id.substr(0, mod.id.lastIndexOf('/')+1);
        }

        Module.prototype.load = function(){
            var mod = this;
            if(!/_module_\d+/.test(mod.name)){
                mod.url = mod.id + '.js';
                try{
                    var buffer = fs.readFileSync(mod.url);
                    mod.content = buffer.toString();
                    mod.content = mod.content.replace(/Nui.define\((['"][^'"]+['"]\s*,)?/, "Nui.define('"+ mod.name +"',");
                    mod.deps = mod.getdeps()
                }
                catch(e){}
            }
            return mod.resolve()
        }

        Module.prototype.getdeps = function(){
            var mod = this;
            var content = mod.content;
            var deps = [];
            var depsMatchs = content.match(/Nui.define\((['"][^'"]+['"]\s*,)?\s*\[([^\[\]]+)\]/);
            var requireMatchs = content.match(/require\(['"][^'"]+['"]\)/g);
            if(depsMatchs){
                var match = depsMatchs[2].split(',');
                match.forEach(function(val, i){
                    val = val.replace(/^\s+|\s+/g, '').replace(/['"]/g, '');
                    if(!inArray(val, options.ignore)){
                        deps.push(val)
                    }
                })
            }
            if(requireMatchs){
                requireMatchs.forEach(function(val, i){
                    val = val.replace(/(require)|[\(\)'"]/g, '');
                    if(!inArray(val, options.ignore)){
                        deps.push(val)
                    }
                })
            }
            return deps
        }

        Module.prototype.resolve = function(){
            var mod = this;
            if(isEmptyObject(mod.depmodules)){
                mod.deps.forEach(function(val, i){
                    var module = Module.getModule(val, [], mod.uri);
                    mod.depmodules[val] = module.load()
                })
            }
            return mod
        }

        Module.prototype.getContents = function(contents){
            var mod = this;
            if(!contents){
                contents = [];
            }
            if(mod.content){
                contents.unshift(mod.content)
            }
            if(mod.deps.length){
                for(var i in mod.depmodules){
                    contents = mod.depmodules[i].getContents(contents)
                }
            }
            return contents
        }

        Module.setId = function(id, uri){
            var name = id.replace(/(\.js)?(\?[\s\S]*)?$/g, '');
            id = uri + name;
            if(options.alias[name]){
                id = options.alias[name].replace(/(\.js)?(\?[\s\S]*)?$/g, '');
            }
            return [replacePath(id), name]
        }

        Module.getModule = function(id, deps, uri){
            var arr = Module.setId(id, uri);
            id = arr[0];
            return cacheModules[id] || (cacheModules[id] = new Module(id, arr[1], deps))
        }

        Module.id = 0;

        Module.load = function(id, callback){
            var mod = Module.getModule('_module_'+Module.id++, [id], dirname);
            callback(mod.load())
        }

        matchs.forEach(function(val, i){
            var id = matchs[i].replace(/Nui.load\(/, '').replace(/['"]/g, '').replace(/-debug|-min/g, '');
            Module.load(id, function(mod){
                var contents = unique(mod.getContents()).join('\r\n');
                var url;
                for(var i in mod.depmodules){
                    url = mod.depmodules[i].url;
                    break;
                }
                if(url){
                    url = url.replace(/(\.js)$/, '-debug$1');
                    fs.writeFile(url, contents)
                }
            })
        })

        cb();
    })
}