一个JavaScript数据筛选器（四）——实现代码

由于一直在快速的迭代重构，为尽快实现预想的功能，代码有些凌乱，且没有注释……。但已经过较为全面的测试，可用性方面是没有问题的。后续会集中精力优化代码架构和性能。

以下是代码全貌，其中moduleDataFinder为功能入口函数，传入原始数据和数据筛选器对象，返回筛选结果数据。代码判断Array类型时，使用了jQuery的部分特性，可以进行简单的修改排除对jQuery的依赖。

    function filterArrayData (data, key, value) {
        var proceedData = [];
        for (var i = 0; i < data.length; i++) {
            if ($.isArray(data[i])) {
                var newArr = [];
                for (var j = 0; j < data[i].length; j++) {
                    newArr = filterArrayData(data[i], key, value);
                }
                proceedData.push(newArr);
            } else {
                if (data[i].hasOwnProperty(key)) {
                    if (data[i][key] == value) {
                        proceedData.push(data[i]);
                    }
                }
            }
        }

        return proceedData;
    };

    function sortArrayData (data, key) {
        var proceedData;
        var desc = false;
        var sortKey = key;
        if (key.substr(0, 1) === '!') {
            sortKey = key.substr(1);
            desc = true;
        }
        proceedData = data.slice(0);
        proceedData.sort(function (a, b) {
            if (sortKey.length)
                return (a[sortKey] < b[sortKey]) ^ desc ? -1 : 1; else
                return (a < b) ^ desc ? -1 : 1;
        });

        return proceedData;
    };

    var isArray = Array.isArray || function (obj) {
        return jQuery.type(obj) === "array";
    };

    function moduleDataFinder (data, bindFinder) {
        var proceedData = null;
        if (isArray(bindFinder)) {
            var newFinder = [];
            var arrProcess = [];
            for (var i = 0; i < bindFinder.length; i++) {
                if (typeof(bindFinder[i]) === "string") {
                    newFinder.push(bindFinder[i]);
                } else if (isArray(bindFinder[i])) {
                    arrProcess = bindFinder[i];
                } else if (typeof(bindFinder[i]) === "object") {
                    newFinder.push(bindFinder[i]);
                }
            }

            proceedData = data;
            if (isArray(proceedData) && arrProcess.length > 0) {
                for (i = 0; i < arrProcess.length; i++) {
                    var arrFinder = arrProcess[i];
                    var key = "";
                    for (key in arrFinder)break;
                    if (key === "$range") {
                        if (typeof(arrFinder[key]) === "number") {
                            proceedData = proceedData[arrFinder[key]];
                        } else if (isArray(arrFinder[key])) {
                            proceedData = proceedData.slice(arrFinder[key][0], arrFinder[key][0] + arrFinder[key][1]);
                        }
                    } else if (key === "$filter") {
                        for (var filterKey in arrFinder[key]) {
                            if (!arrFinder[key].hasOwnProperty(filterKey))continue;
                            proceedData = filterArrayData(proceedData, filterKey, arrFinder[key][filterKey]);
                        }
                    } else if (key === "$sort") {
                        if (typeof(arrFinder[key]) === "string") {
                            proceedData = sortArrayData(proceedData, arrFinder[key]);
                        } else {
                            for (var j = arrFinder[key].length - 1; j >= 0; j--) {
                                proceedData = sortArrayData(proceedData, arrFinder[key][j]);
                            }
                        }
                    }
                }
            }

            if (newFinder.length > 0) {
                if (isArray(proceedData)) {
                    var tmpArr = [];
                    for (i = 0; i < proceedData.length; i++) {
                        var arrProceedData = {};
                        arrProceedData = moduleDataFinder(proceedData[i], newFinder).data;
                        tmpArr.push(arrProceedData);
                    }
                    if (tmpArr.length > 0) {
                        proceedData = tmpArr;
                    }
                } else if (proceedData != null) {

                    var tmpProceedData = null;
                    for (i = 0; i < newFinder.length; i++) {
                        var tmpData = moduleDataFinder(proceedData, newFinder[i]).data;
                        if (tmpData == null) {
                            tmpData = "";
                        }
                        if (tmpProceedData == null)
                            tmpProceedData = {};

                        if (typeof(newFinder[i]) === "string") {
                            tmpProceedData[newFinder[i]] = tmpData;
                        } else {
                            var tmpKey = null;
                            for (tmpKey in newFinder[i]) {
                                break;
                            }
                            if (tmpKey === "$map") {
                                for (tmpKey in tmpData) {
                                    break;
                                }
                                tmpData = tmpData[tmpKey];
                            }
                            tmpProceedData[tmpKey] = tmpData;
                        }
                    }
                    proceedData = tmpProceedData;
                }
            }
        } else if (typeof(bindFinder) === "object") {
            for (key in bindFinder) {
                if (!bindFinder.hasOwnProperty(key))continue;
                if (key.substr(0, 1) === '$') {
                    if (key === "$hidden") {
                        tmpData = moduleDataFinder(data, bindFinder[key]).data;
                        if (tmpData != null) {
                            proceedData = tmpData;
                        }
                    } else if (key === "$image") {
                        tmpData = moduleDataFinder(data, bindFinder[key]).data;
                        if (tmpData != null) {
                            proceedData = tmpData;
                        }
                    } else if (key === "$html") {
                        tmpData = moduleDataFinder(data, bindFinder[key]).data;
                        if (tmpData != null) {
                            proceedData = tmpData;
                        }
                    } else if (key === "$map") {
                        var tmpMap = bindFinder[key];
                        for (var mapKey in tmpMap) {
                            if (!tmpMap.hasOwnProperty(mapKey))continue;
                            tmpData = moduleDataFinder(data, mapKey).data;
                            var keyData = tmpData;
                            var mapper = moduleMap[tmpMap[mapKey]];
                            if (typeof(mapper) === "function") {
                                tmpData = mapper(keyData);
                            } else {
                                if (tmpData == null) {
                                    keyData = "$null";
                                }
                                if (!moduleMap[tmpMap[mapKey]].hasOwnProperty(keyData)) {
                                    keyData = "$default";
                                }
                                tmpData = moduleMap[tmpMap[mapKey]][keyData];
                            }
                            proceedData = {};
                            proceedData[mapKey] = tmpData;
                            break;
                        }
                    } else if (key === "$addition") {
                        var tmpAdd = bindFinder[key];
                        proceedData = {};

                        for (i = 0; i < tmpAdd.length; i++) {
                            proceedData[tmpAdd[i]] = moduleDataFinder(data, tmpAdd[i]).data;
                        }
                    }
                } else if (isArray(bindFinder[key])) {
                    if (isArray(data)) {
                        tmpArr = [];
                        for (i = 0; i < data.length; i++) {
                            arrProceedData = {};
                            arrProceedData = moduleDataFinder(data[i], bindFinder).data;
                            tmpArr.push(arrProceedData);
                        }
                        if (tmpArr.length > 0)
                            proceedData = tmpArr;
                    } else if (data != null) {
                        if (data.hasOwnProperty(key)) {
                            tmpData = moduleDataFinder(data[key], bindFinder[key]);
                            if (tmpData.data != null) {
                                if (proceedData === null)
                                    proceedData = {};
                                proceedData = tmpData.data;
                            }
                        }
                    }
                } else if (typeof(bindFinder[key]) === "string") {
                    proceedData = moduleDataFinder(data[key], bindFinder[key]).data;
                }
                break;
            }
        } else if (typeof(bindFinder) === "string") {
            if (isArray(data)) {
                tmpArr = [];
                for (i = 0; i < data.length; i++) {
                    arrProceedData = {};
                    arrProceedData = moduleDataFinder(data[i], bindFinder).data;
                    tmpArr.push(arrProceedData);
                }
                if (tmpArr.length > 0)
                    proceedData = tmpArr;
            } else if (data != null) {
                if (data.hasOwnProperty(bindFinder)) {
                    proceedData = data[bindFinder];
                }
            }
        }

        return {"data": proceedData};
    };

接下来会介绍与这个数据筛选器匹配的数据绑定器。