git.kianting.info Git - uann/blob - src/index.js

   1 "use strict";
   2 Object.defineProperty(exports, "__esModule", { value: true });
   3 exports.tokenize = exports.zeroOrOnceDo = exports.notDo = exports.zeroOrMoreDo = exports.orDo = exports.thenDo = exports.charToCodepoint = exports.matchRange = exports.matchAny = exports.match1Char = void 0;
   4 var fs = require('fs');
   5 /**
   6  * wrap a x in a `Some(T)`
   7  * @param x : variable to be wrapped.
   8  * @returns wrapped `x`.
   9  */
  10 function toSome(x) {
  11     return { _tag: "Some", value: x };
  12 }
  13 /**
  14  * @description
  15  * it returns a function which test if the first char of the `remained` part of
  16  *  the argument of the function is `c`, if it's true, update the `MatchedPair` wrapped
  17  * in `Some`. Otherwise, it returns `None`.
  18  *  * @param c : the char to be test.
  19  * @returns the updated `MatchedPair` wrapped in `Some(x)` or `None`.
  20  */
  21 function match1Char(c) {
  22     return (m) => {
  23         if (m.remained.length == 0) {
  24             return { _tag: "None" };
  25         }
  26         const charToBeMatched = m.remained[0];
  27         if (charToBeMatched === c) {
  28             return { _tag: "Some", value: {
  29                     matched: m.matched + charToBeMatched,
  30                     remained: m.remained.substring(1)
  31                 } };
  32         }
  33         else {
  34             return { _tag: "None" };
  35         }
  36     };
  37 }
  38 exports.match1Char = match1Char;
  39 ;
  40 /**
  41  *
  42  * @param m : the `MatcheePair` to be consumed.
  43  * @returns if the length of `m.remained` >= 1; consumes the matchee by 1 char and wraps it in `Some`,
  44  * otherwise, returns `None`.
  45  */
  46 function matchAny(m) {
  47     if (m.remained.length >= 1) {
  48         return { _tag: "Some", value: {
  49                 matched: m.matched + m.remained[0],
  50                 remained: m.remained.substring(1)
  51             } };
  52     }
  53     else {
  54         return { _tag: "None" };
  55     }
  56 }
  57 exports.matchAny = matchAny;
  58 /**
  59  * @description
  60  * it returns a function which test if the first char of the `remained` part of
  61  *  the argument of the function is between `l` and `u`, if it's true, update the `MatchedPair` wrapped
  62  * in `Some`. Otherwise, it returns `None`.
  63  *  * @param l : lower bound char, 1-char string
  64  *  * @param u : upper bound char, 1-char string
  65  * @returns the updated `MatchedPair` wrapped in `Some(x)` or `None`.
  66  */
  67 function matchRange(l, u) {
  68     let lCodepoint = charToCodepoint(l);
  69     let uCodepoint = charToCodepoint(u);
  70     if (l > u) {
  71         throw new Error("Error: the codepoint of `" + l + "` is not smaller than `" + u + "`)");
  72     }
  73     return (m) => {
  74         if (m.remained.length < 1) {
  75             return { _tag: "None" };
  76         }
  77         const charToBeMatched = m.remained[0];
  78         const codePointToBeMatched = charToCodepoint(charToBeMatched);
  79         if (codePointToBeMatched >= lCodepoint && codePointToBeMatched <= uCodepoint) {
  80             return { _tag: "Some", value: {
  81                     matched: m.matched + charToBeMatched,
  82                     remained: m.remained.substring(1)
  83                 } };
  84         }
  85         else {
  86             return { _tag: "None" };
  87         }
  88     };
  89 }
  90 exports.matchRange = matchRange;
  91 ;
  92 /**
  93  * convert the one-char string to codepoint.
  94  * @param s : the string to code point.
  95  * @returns if `s.length > 1` return error; otherwise, return the codepoint of `s`.
  96  */
  97 function charToCodepoint(s) {
  98     if (s.length > 1) {
  99         throw new Error("Error: the length of input string for " + s + "is " + s.length + `,
 100         however, it should be 1.`);
 101     }
 102     else {
 103         return s.charCodeAt(0);
 104     }
 105 }
 106 exports.charToCodepoint = charToCodepoint;
 107 /**
 108  *  @description thendo(input, f, ...) like
 109  * a ==> f
 110  * @param input: the wrapped input.
 111  * @param f: the function to be applied.
 112  *
 113  * @returns:the applied wrapped result `MatcheePair`.
 114  */
 115 function thenDo(input, f) {
 116     if (input._tag == "None") {
 117         return input;
 118     }
 119     else {
 120         let inner = input.value;
 121         return f(inner);
 122     }
 123 }
 124 exports.thenDo = thenDo;
 125 /**
 126  * @description "or", like the regex `( f1 | f2 )` .
 127  * It returns a function `f` of which the argument is`x`.
 128  * if `f1(x)` is None, then `f` returns `f2(x)`. Otherwise,
 129  * `F` returns `f1(x)`.
 130  * @param f1 : 1st function to be compared
 131  * @param f2 : 2nd function to be compared
 132  * @returns:the combined function
 133  */
 134 function orDo(f1, f2) {
 135     return (x) => {
 136         let f1x = (f1(x));
 137         {
 138             if (f1x._tag == "None") {
 139                 return f2(x);
 140             }
 141             else {
 142                 return f1x;
 143             }
 144         }
 145     };
 146 }
 147 exports.orDo = orDo;
 148 /**
 149 * @description repeating matching function `f`
 150 * zero or more times, like the asterisk `*` in regex `f*` .
 151 * @param f : the function to be repeated 0+ times.
 152 * @returns:the combined function
 153 */
 154 function zeroOrMoreDo(f) {
 155     return (x) => {
 156         var wrapped_old_x = { _tag: "Some", value: x };
 157         var wrapped_new_x = wrapped_old_x;
 158         while (wrapped_new_x._tag != "None") {
 159             wrapped_old_x = wrapped_new_x;
 160             wrapped_new_x = thenDo(wrapped_old_x, f);
 161         }
 162         ;
 163         return wrapped_old_x;
 164     };
 165 }
 166 exports.zeroOrMoreDo = zeroOrMoreDo;
 167 /**
 168 * @description Not. like the `^` inside regex of [^f].
 169 * returns a function `F(x)` such that if  `f(x)` is `None`,
 170 * returns the x consuming a char; if `f(x)` is not None, F(x)
 171 * returns `None`.
 172 * @param f: the function forbidden to be matched.
 173 * @returns: combined function `F`.
 174 */
 175 function notDo(f) {
 176     return (x) => {
 177         let wrapped_x = {
 178             _tag: "Some",
 179             value: x
 180         };
 181         let f_x = thenDo(wrapped_x, f);
 182         if (f_x._tag != "None") {
 183             return { _tag: "None" };
 184         }
 185         else {
 186             return thenDo(wrapped_x, matchAny);
 187         }
 188     };
 189 }
 190 exports.notDo = notDo;
 191 /**
 192  * if `x` is matched by `f` once, returns `f(x)`. Otherwise,
 193  * returns x
 194  * similar to `?` in regex `f?`.
 195  * @param f : the function to be matched
 196  * @returns return wrapped f(x)
 197  */
 198 function zeroOrOnceDo(f) {
 199     return (x) => {
 200         var wrapped_old_x = { _tag: "Some", value: x };
 201         var wrapped_new_x = thenDo(wrapped_old_x, f);
 202         if (wrapped_new_x._tag != "None") {
 203             return wrapped_new_x;
 204         }
 205         else {
 206             return wrapped_old_x;
 207         }
 208     };
 209 }
 210 exports.zeroOrOnceDo = zeroOrOnceDo;
 211 function tokenize(input) {
 212     var input_matchee_pair = toSome({ matched: "",
 213         remained: input });
 214     // integer = ([+]|[-])\d\d?
 215     let integer = (x) => {
 216         let wrapped_x = toSome(x);
 217         let plusMinus = orDo(match1Char('+'), match1Char('-')); // ([+]|[-])
 218         let d = matchRange('0', '9'); // \d
 219         return thenDo(thenDo(thenDo(wrapped_x, zeroOrOnceDo(plusMinus)), d), zeroOrMoreDo(d));
 220     };
 221     console.log(input + ", result: ");
 222     console.log(thenDo(input_matchee_pair, integer));
 223     // TODO: id, string, space, basic operator, 3 marks: @, {, }.
 224 }
 225 exports.tokenize = tokenize;
 226 tokenize("+123");
 227 tokenize("123");
 228 tokenize("-123");
 229 tokenize(" 123");
 230 tokenize("c123");