增加正则库

libs/exRegExp.js

+/**
+ * 字符串分段处理
+ * @param {String} code 处理字符串
+ * @param {Array} options 分段数组
+ * @param {Array<Function|Boolean>} maps 分段映射函数
+ * @param {Boolean} all 是否完全映射
+ * @returns {Array} 映射结果
+ */
+function tsCode(code, options, maps, all) {
+    let start = 0, res = [];
+    if (maps) {
+        if (typeof maps === 'function') {
+            options.forEach((part, index) => {
+                res.push(maps(code.slice(start, part + start)));
+                start += part;
+            });
+        } else {
+            options.forEach((part, index) => {
+                if (typeof maps[index] === 'function') {
+                    res.push(maps[index](code.slice(start, part + start)));
+                } else if (maps[index] !== undefined) {
+                    if (maps[index] === true) res.push(code.slice(start, part + start));
+                    else res.push(maps[index]);
+                } else if (all) res.push(code.slice(start, part + start));
+                start += part;
+            });
+        };
+        return res
+    } else {
+        options.forEach(part => {
+            res.push(code.slice(start, part + start));
+            start += part;
+        });
+        return res
+    }
+}
+
+function range(end, start = 0, reverse) {
+    if (reverse) {
+        const arr = [];
+        for (let i = end; i >= start; i--) {
+            arr.push(i);
+        };
+        return arr;
+    } else {
+        const arr = [];
+        for (let i = start; i <= end; i++) {
+            arr.push(i);
+        };
+        return arr;
+    }
+}
+
+/**
+ * 正则函数调用及函数结果插入递归替换
+ * [[mark=func:regExp]] //正则函数调用(标记与函数不同名)
+ * [[func:regExp]] //正则函数调用(标记与函数同名)
+ * [[mark|func]] //按标记插入结果
+ * @param {RegExp} reg 
+ */
+function splitRegExp({ oldRes, source, flags, split, res, fns, str, old, lastIndex, oldReg, oldLeft, oldRight, inner, oldSource }) {
+    function next() {//回溯处理
+        const oldData = old[old.length - 1];
+        if (oldData) {
+            const lefts = res[oldData.oldLeft];
+            if (Array.isArray(lefts)) {
+                return splitRegExp({ oldRes, flags, split, fns, str, old, ...oldData });
+            } else {
+                return splitRegExp({ oldRes, flags, split, fns, str, old, ...old.pop() });
+            }
+        }
+    };
+
+    if (oldReg) {//回溯处理
+        let oldNum, leftRes;
+        if (Array.isArray(res[oldLeft])) {
+            res[oldLeft].shift();
+            leftRes = oldRes[oldLeft] = res[oldLeft][0];
+            if (res[oldLeft].reg[0]) {
+                res[oldLeft].reg.shift();
+                inner = res[oldLeft].reg[0];
+            };
+            if (leftRes.length === 1) {
+                oldNum = 0;
+            }
+        } else {
+            oldNum = 1;
+        }
+
+        let reg = inner ? (
+            source = tsCode(oldSource, [lastIndex, res[oldLeft].len, Infinity], {
+                1: `(?:${inner})`  //从结果池中以标记为键读取插入到原始正则之中
+            }, true).join(''),
+            new RegExp(inner, flags)
+        ) : oldReg,
+            mats = reg.exec(str);
+
+        switch (oldNum) {
+            case 0:
+                old[old.length - 1] = { lastIndex, oldSource, source, oldReg: reg, oldLeft, oldRight, res: { ...res, [oldLeft]: leftRes }, inner };
+                break;
+            case 1:
+                res[oldLeft] = fns[oldRight](mats, reg);
+                old.push({ lastIndex, oldSource, source, oldReg: reg, oldLeft, oldRight, res: { ...res } });
+                break;
+        };
+
+        return splitRegExp({ oldRes, source, flags, split, res, fns, str, old });
+
+    } else {
+        const mat = split.exec(source);//匹配函数调用点或函数结果插入点
+        if (mat) {
+            let lastIndex = mat.index, so = mat[1], index = so.indexOf(':');
+            if (index !== -1) {//函数调用点
+                let [first, last] = tsCode(so, [index, 1, Infinity], {
+                    0: true,
+                    2: true
+                }),
+                    reg = new RegExp(last, flags),
+                    mats = reg.exec(str);
+                if (mats) {//匹配成功递归处理
+                    const index2 = first.indexOf('='),
+                        [left, right] = index2 === -1 ? [first, first] : tsCode(first, [index2, 1, Infinity], {
+                            0: true,
+                            2: true
+                        }), fnRes = fns[right](mats, reg);
+                    res[left] = fnRes;
+                    if (Array.isArray(fnRes)) {
+                        fnRes.len = mat[0].length;
+                        if (fnRes.reg[0]) last = fnRes.reg[0];
+                        oldRes[left] = fnRes[0];
+                    };
+                    const oldSource = source;
+                    source = tsCode(source, [lastIndex, mat[0].length, Infinity], {
+                        1: `(?:${last})`  //从结果池中以标记为键读取插入到原始正则之中
+                    }, true).join('');
+                    old.push({ lastIndex, oldSource, source, oldReg: reg, oldLeft: left, oldRight: right, res: { ...res } });
+                    return splitRegExp({ oldRes, source, flags, split, res, fns, str, old });
+                } else return next();
+            } else {//函数结果插入点
+                const [lenStr, name] = mat;
+                let inner;
+                if (res[name] === undefined) {
+                    try {
+                        inner = fns[name]();
+                        if (inner === undefined) return next();
+                    } catch (e) {
+                        return //函数中主动抛出错误,触发匹配失败返回
+                    }
+                } else if (Array.isArray(res[name])) {
+                    inner = oldRes[name];
+                } else {
+                    inner = res[name]
+                };
+                source = tsCode(source, [lastIndex, lenStr.length, Infinity], {
+                    1: inner  //从结果池中以标记为键读取插入到原始正则之中
+                }, true).join('');
+                return splitRegExp({ oldRes, source, flags, split, res, fns, str, old });
+            }
+        } else {
+            return { source, next }
+        };
+
+    };
+};
+
+/**
+ * 增强正则工具对象生成
+ * @param {RegExp} reg 增强型原始正则
+ * @param {Function} fns 插入正则的函数集
+ * @param {String|Function} str 待匹配字符串,或生成下一个正则时回调执行函数
+ * @param {Function} next 生成下一个正则时回调执行函数
+ * @returns {{regExp:RegExp,next:Function,exec:Function,test:Function,match:Function,matchAll:Function,replace:Function,search:Function,split:Function}} 正则工具对象
+ */
+function exRegExp({ reg, fns, str, next }) {
+    const oldSplit = /\[\[(.*?[^\\])\]\]/g;
+    let regExp, notFirst, source, flags, newFlags, nextCall, res = {}, oldRes = {}, old = [];
+    if (reg) {
+        source = reg.source.replace(/\\\[(?=\[)/g, '(?:\\[)');
+        if (!(newFlags = reg.flags.replace('y', 'g')).includes('g')) {
+            newFlags += 'g';
+        };
+        if (str) regExp = returnRegExp(oldRes, source, oldSplit, newFlags, fns, str, res, old);
+    };
+
+    function matRegExp(mat) {
+        if (mat) {
+            const { source, next: callback } = mat,
+                regExp = new RegExp(source, flags);
+            if (next) {
+                nextCall = () => {
+                    const genReg = matRegExp(callback());
+                    next(genReg);
+                    return genReg;
+                };
+            } else {
+                nextCall = () => matRegExp(callback());
+            }
+            return regExp;
+        } else {
+            //正则表达式出错
+            throw { reg, flags, fns, str }
+        };
+    };
+    function returnRegExp(oldRes, source, split, newFlags, fns, str, res, old, inner) {
+        return matRegExp(splitRegExp({
+            source,
+            split,
+            flags: newFlags,
+            fns,
+            str,
+            res,
+            old,
+            inner,
+            oldRes
+        }));
+    };
+
+    function preExec() {
+        if (notFirst) {
+            try {
+                regExp = nextCall();
+            } catch (e) {
+                return true
+            };
+        } else {
+            notFirst = true;
+        }
+    };
+    function exec() {
+        if (preExec()) return null;
+        const exec = regExp.exec(str);
+        if (exec) {
+            return exec
+        } else {
+            try {
+                regExp = nextCall();
+                return exec();
+            } catch (e) {
+                console.log(e);
+                return null
+            }
+        }
+    };
+
+    function test() {
+        const testRes = regExp.test(str);
+        if (testRes) {
+            return true
+        } else {
+            try {
+                regExp = nextCall();
+                return test();
+            } catch (e) {
+                console.log(e);
+                return false
+            }
+        }
+    };
+
+    function match() {
+        const matchRes = str.match(regExp);
+        if (matchRes) {
+            return matchRes
+        } else {
+            try {
+                regExp = nextCall();
+                return match();
+            } catch (e) {
+                console.log(e);
+                return null
+            }
+        }
+    };
+
+    function matchAll() {
+        const matchAllRes = str.matchAll(regExp);
+        if (matchAllRes) {
+            return matchAllRes
+        } else {
+            try {
+                regExp = nextCall();
+                return matchAll();
+            } catch (e) {
+                console.log(e);
+                return null
+            }
+        }
+    };
+
+    function replace(callback, change) {
+        const replaceRes = str.replace(regExp, callback);
+        if (change) {
+            if (replaceRes !== str) {
+                return replaceRes
+            } else {
+                try {
+                    regExp = nextCall();
+                    return replace(str);
+                } catch (e) {
+                    console.log(e);
+                    return str
+                }
+            };
+        } else {
+            return replaceRes
+        };
+    };
+
+    function search() {
+        const searchRes = str.search(regExp);
+        if (searchRes !== -1) {
+            return searchRes
+        } else {
+            try {
+                regExp = nextCall();
+                return search(str);
+            } catch (e) {
+                console.log(e);
+                return -1
+            }
+        };
+    };
+
+    function split(limit, change) {
+        const splitRes = str.split(regExp, limit);
+        if (change) {
+            if (splitRes.length !== 1) {
+                return splitRes
+            } else {
+                try {
+                    regExp = nextCall();
+                    return split(str);
+                } catch (e) {
+                    console.log(e);
+                    return [str]
+                }
+            };
+        } else {
+            return splitRes
+        };
+    };
+
+    return {
+        //当前生成的正则
+        get regExp() { return regExp },
+        set regExp(nv) {
+            reg = nv;
+            notFirst = false;
+            res = {};
+            oldRes = {};
+            old = [];
+            flags = reg.flags;
+            nextCall = undefined;
+            source = reg.source.replace(/\\\[(?=\[)/g, '(?:\\[)');
+            if (!(newFlags = flags.replace('y', 'g')).includes('g')) {
+                newFlags += 'g';
+            };
+            if (str) regExp = returnRegExp(oldRes, source, oldSplit, newFlags, fns, str, res, old);
+        },
+        //当前匹配的字符串
+        get str() {
+            return str
+        },
+        set str(newStr) {
+            str = newStr;
+            notFirst = false;
+            res = {};
+            oldRes = {};
+            old = [];
+            nextCall = undefined;
+            if (reg) regExp = returnRegExp(oldRes, source, oldSplit, newFlags, fns, str, res, old);
+        },
+        next() {//生成下一个有效正则,全部无效时报错
+            return nextCall()
+        },
+
+        exec, /**
+         exec() => regExp.exec(str)
+        无需主动执行next,当上个正则耗尽后,再调用exec则主动生成下一个有效正则
+        */
+
+        test,/**
+         test() => regExp.test(str)
+        匹配失败时主动执行next生成下一个有效正则
+        可主动执行next,主动生成下一个有效正则作为匹配正则
+        */
+
+        match,/**
+         * match() => str.match(regExp)
+        匹配失败时主动执行next生成下一个有效正则
+        可主动执行next,主动生成下一个有效正则作为匹配正则
+        */
+
+        matchAll, /**
+        matchAll() => str.matchAll(regExp)
+        匹配失败时主动执行next生成下一个有效正则
+        可主动执行next,主动生成下一个有效正则作为匹配正则
+        */
+
+        replace, /**
+        //replace(callback, change) => str.replace(regExp,callback);
+        change为true时,如果替换后的值与替换前一样,则自动调用next生成下一个有效正则继续执行replace(callback, change)
+        change为false时,只要生成的正则有效则只执行一次replace
+        可主动执行next,主动生成下一个有效正则作为匹配正则
+         */
+
+        search, /**
+        search() => str.search(regExp)
+        匹配失败时主动执行next生成下一个有效正则
+        可主动执行next,主动生成下一个有效正则作为匹配正则
+        */
+
+        split /**
+        split(limit, change) => str.split(regExp,limit)
+        change为true时,如果切割后数组长度为1,则自动调用next生成下一个有效正则继续执行split(limit, change)
+        change为false时,只要生成的正则有效则只执行一次split
+        可主动执行next,主动生成下一个有效正则作为匹配正则
+        */
+    }
+};
+
+//示例
+const obj = exRegExp({
+    reg: /ersd[[reg:(ka)+]].*ef(fa){[[reg]]}.*sas/g,
+    fns: {
+        reg([$0, $1]) {
+            const range0 = range($0.length / $1.length, 1, true);
+            range0.reg = range0.map(it => new Array(it).fill($1).join(''));
+            return range0
+        }
+    },
+    str: 'bvgvgersdkakakaeffafaeffafafasaskuyfu'
+});
+
+console.log('match:', obj.match()); //match1: ['ersdkakakaeffafaeffafafasas', 'fa', index: 5, input: 'bvgvgersdkakakaeffafaeffafafasaskuyfu', groups: undefined]
+
+obj.regExp = /[[reg:(ka)+]]ef(fa){[[reg]]}/g;
+
+console.log('match2:', obj.match()); //match2: ['kakaeffafa']
\ No newline at end of file