git.kianting.info Git - clo/blob - src/index.ts

   1 var fs = require('fs');
   2 import { argv, resourceUsage } from 'node:process';
   3 import * as tk from './tokenize.js';
   4 import * as util from 'util';
   5 import { drawEllipsePath, reduceRotation } from 'pdf-lib';
   6 import { isAnyArrayBuffer, isTypedArray } from 'node:util/types';
   7 import { error } from 'node:console';
   8 import { isUndefined } from 'node:util';
   9
  10 /**
  11  * debug reprensenting
  12  */
  13 let repr = (x : any)=>{return util.inspect(x, {depth: null})};
  14
  15 /**
  16  * token tree type.
  17  */
  18 type tkTree = tkTree[] | tk.Token
  19
  20 /**
  21  * concated 2 `tkTree`s
  22  * @param x the array to be concated
  23  * @param y the item or array to ve concated
  24  * @returns concated tkTree array, or thrown error if can't be concated.
  25  */
  26 function concat(x: tkTree, y:tkTree): tkTree[] {
  27     if (Array.isArray(x)){
  28             return x.concat(y);
  29     }else{
  30         throw new Error("the tkTree can't be concated, because it's not an array.");
  31
  32     }
  33 }
  34
  35 function slice(x: tkTree, index?:number, end?:number): tkTree[] {
  36     if (Array.isArray(x)){
  37             return x.slice(index,end);
  38     }else{
  39         throw new Error("the tkTree can't be concated, because it's not an array.");
  40
  41     }
  42 }
  43
  44 /**
  45  * TokenMatcheePair for tokens' parser combinator
  46  *
  47  * matched: the matched (now and before) tokens
  48  *
  49  * remained: tokens to be matched
  50  *
  51  * ast: abstract syntax tree
  52  */
  53 export interface TokenMatcheePair {
  54     matched: tk.Token[]
  55     remained: tk.Token[]
  56     ast : tkTree[]
  57 }
  58
  59 /**
  60  * convert a `tkTree` AST to S-expr string
  61  * @param t the `tkTree`
  62  * @returns S-expr String
  63  */
  64 export function tkTreeToSExp(t: tkTree): string{
  65     var str = "";
  66
  67     if (Array.isArray(t)){
  68         let strArray = t.map((x)=>tkTreeToSExp(x));
  69         str = "(" + strArray.join(" ") + ")";
  70     }else{
  71         if (t=== undefined){
  72             str = "%undefined"
  73         }else{
  74             str = t.text;
  75         }
  76     }
  77
  78     return str;
  79 }
  80
  81 /**
  82  * @description
  83  * match one token type.
  84  *
  85  * it returns a function which test if the type of first token of the `remained` part of
  86  *  the argument of the function is `typ` , if it's true, update the `TokenMatcheePair` wrapped
  87  * in `Some`. Otherwise, it returns `None`.
  88  *  * @param typ : the type to be test.
  89  * @returns the updated `TokenMatcheePair` wrapped in `Some(x)` or `None`.
  90  */
  91 export function m1TType(typ: tk.TokenType):
  92     (m: TokenMatcheePair) => tk.Maybe<TokenMatcheePair> {
  93     return (m: TokenMatcheePair) => {
  94         if (m.remained.length == 0) {
  95             return { _tag: "None" };
  96         }
  97         /**
  98          * token to be matched
  99          * */
 100         const ttbm = m.remained[0];
 101
 102         if (ttbm.type == typ) {
 103             let new_matched = m.matched.concat(ttbm);
 104             let result : tk.Some<TokenMatcheePair> = {
 105                 _tag: "Some", value: {
 106                     matched: new_matched,
 107                     remained: m.remained.slice(1),
 108                     ast:  ([ttbm]),
 109                 }
 110             };
 111             return result;
 112         }
 113         else {
 114             return { _tag: "None" };
 115         }
 116     }
 117 };
 118
 119 /**
 120  * type int
 121  */
 122 let tInt  = m1TType(tk.TokenType.INT);
 123 let tId  = m1TType(tk.TokenType.ID);
 124
 125
 126 let tAdd  = m1TType(tk.TokenType.I_ADD);
 127 let tSub = m1TType(tk.TokenType.I_SUB);
 128 let tMul  = m1TType(tk.TokenType.I_MUL);
 129 let tDiv = m1TType(tk.TokenType.I_DIV);
 130 let tLParen = m1TType(tk.TokenType.L_PAREN);
 131 let tRParen = m1TType(tk.TokenType.R_PAREN);
 132 let tComma = m1TType(tk.TokenType.COMMA);
 133 let toSome = tk.toSome;
 134
 135
 136 argv.forEach((val, index) => {
 137     console.log(`${index}=${val}`);
 138 });
 139
 140
 141 /**
 142  * like `m ==> f` in ocaml
 143  * @param m matchee wrapped
 144  * @param f matching function
 145  * @returns wrapped result
 146  */
 147 function thenDo(m : tk.Maybe<TokenMatcheePair>, f : Function){
 148     if (m._tag == "None"){
 149         return m;
 150     }else{
 151         var a : tk.Maybe<TokenMatcheePair> = f(m.value);
 152         if (a._tag == "Some"){
 153             a.value.ast = concat(m.value.ast, a.value.ast);
 154         }
 155
 156         return a;
 157     }
 158 }
 159
 160 /**
 161  * like `f1 | f2` in regex
 162  * @param f1 the first tried function
 163  * @param f2 the second tried function
 164  * @returns wrapped result
 165  */
 166 function orDo(f1 : Function, f2 : Function){
 167     return (x : TokenMatcheePair) =>{
 168         let res1 : tk.Maybe<TokenMatcheePair> = f1(x);
 169         if (res1._tag == "Some"){
 170             return res1;
 171         }else{
 172             let res2 : tk.Maybe<TokenMatcheePair> = f2(x);
 173             return res2;
 174         }
 175     }
 176 }
 177
 178
 179 /**
 180  *
 181  * @param m : the `MatcheePair` to be consumed.
 182  * @returns if the length of `m.remained` >= 1; consumes the matchee by 1 token
 183  *  and wraps it in `Some`,
 184  * otherwise, returns `None`.
 185  */
 186 export function matchAny(m: TokenMatcheePair): tk.Maybe<TokenMatcheePair> {
 187     if (m.remained.length >= 1) {
 188         return {
 189             _tag: "Some", value: {
 190                 matched: m.matched.concat(m.remained[0]),
 191                 remained: m.remained.slice(1),
 192                 ast :  [m.remained[0]],
 193             }
 194         };
 195     } else {
 196         return { _tag: "None" };
 197     }
 198 }
 199
 200 /**
 201  * Danger : Maybe it's not enough to work.
 202 * @description repeating matching function `f`
 203 * zero or more times, like the asterisk `*` in regex `f*` .
 204 * @param f : the function to be repeated 0+ times.
 205 * @returns:the combined function
 206 */
 207 export function OnceOrMoreDo(f: Function): (x: TokenMatcheePair) =>
 208     tk.Maybe<TokenMatcheePair> {
 209     return (x) => {
 210         var wrappedOldX: tk.Maybe<TokenMatcheePair> = { _tag: "Some", value: x };
 211         var wrappedNewX: tk.Maybe<TokenMatcheePair> = wrappedOldX;
 212
 213         var counter = -1;
 214
 215         while (wrappedNewX._tag != "None") {
 216             wrappedOldX = wrappedNewX;
 217             wrappedNewX = thenDo(wrappedOldX, f);
 218             counter += 1;
 219
 220         };
 221
 222         if (counter <= 0){
 223             return { _tag: "None"};
 224         }
 225         let ast = wrappedOldX.value.ast ;
 226         wrappedOldX.value.ast =ast.slice(ast.length-counter);
 227         console.log(repr(wrappedOldX.value.ast));
 228
 229         return wrappedOldX; };
 230 }
 231
 232 /**
 233  * aux function for midfix operator
 234  * @param f function
 235  * @param signal the rule name
 236  * @returns
 237  */
 238 let midfix = (f : Function, signal? : string) => (x : TokenMatcheePair)=>{
 239     var a = f(x);
 240     if (a._tag == "Some"){
 241         let ast_tail : tkTree[] = slice(a.value.ast,a.value.ast.length-3);
 242         let new_ast = [ast_tail];
 243         a.value.ast = new_ast;
 244
 245         // console.log("+"+signal+"+"+repr(a));
 246
 247
 248     }
 249     return a;
 250 }
 251
 252 let circumfix = (f : Function, signal? : string) => (x : TokenMatcheePair)=>{
 253     var a = f(x);
 254     if (a._tag == "Some"){
 255         console.log("$$$"+repr(a.value.ast));
 256         let inner = a.value.ast[a.value.ast.length-2];
 257         var ast_middle : tkTree[];
 258         if (Array.isArray(inner)){
 259             ast_middle = inner;
 260         }
 261         else{
 262             ast_middle = [inner];
 263         }
 264         let new_ast = [ast_middle];
 265         a.value.ast = new_ast;
 266     }
 267     return a;
 268 }
 269
 270 /** single1 = tInt | "(" expr ")"*/
 271 let single1 = circumfix((x : TokenMatcheePair) =>
 272     thenDo(thenDo(thenDo(toSome(x), tLParen), expr), tRParen), "fac1");
 273 let single2= tInt;
 274 let single = orDo(single1, single2);
 275
 276 /** args = single "," args | single */
 277 let args1 = (x: TokenMatcheePair)=>{
 278     var ret = thenDo(thenDo(thenDo(toSome(x), single), tComma), args);
 279     if (ret._tag == "Some"){
 280         let retLength = ret.value.ast.length;
 281         ret.value.ast = [[ret.value.ast[retLength-3]].concat(ret.value.ast[retLength-1])];
 282         console.log("$$"+repr(ret.value.ast));
 283     }
 284     return ret;
 285 };
 286
 287 let args2 = single;
 288
 289 let args = orDo(args1, args2);
 290
 291
 292 /** callees = "(" args ")" | "(" ")" */
 293
 294
 295 let callees1 = circumfix((x : TokenMatcheePair) =>
 296     thenDo(thenDo(thenDo(toSome(x), tLParen), args), tRParen), "callees1");
 297 let callees2 = (x: TokenMatcheePair)=>{
 298     let ret = thenDo(thenDo(toSome(x), tLParen), tRParen);
 299     if (ret._tag == "Some"){
 300         let new_ast : tkTree[] = [[]];
 301         ret.value.ast = new_ast;
 302     }
 303
 304     return ret};
 305
 306 let callees = orDo(callees1, callees2);
 307
 308
 309
 310 /** %apply R combinating token */
 311 let applyToken = {
 312     text: "%apply",
 313     type: tk.TokenType.ID,
 314     col: 0,
 315     ln: 0,
 316 }
 317
 318 /** facAux = callees facAux |  callees */
 319 let facAux1 = (x: TokenMatcheePair)=>{
 320     var ret = thenDo(thenDo(toSome(x), callees), facAux);
 321     if (ret._tag == "Some"){
 322         console.log("1232345"+repr(tkTreeToSExp(ret.value.ast[ret.value.ast.length-1])));
 323     let last1  = ret.value.ast[ret.value.ast.length-1];
 324     let last2  = ret.value.ast[ret.value.ast.length-2];
 325
 326
 327     let b : tkTree[] = [applyToken];
 328     ret.value.ast = [b.concat([last2, last1])];
 329     console.log("11111"+repr(tkTreeToSExp(ret.value.ast)));
 330
 331     };
 332
 333 return ret;}
 334 let facAux2 = callees;
 335 let facAux =  orDo(facAux1, facAux2);
 336
 337
 338
 339 /** fac = single facAux | single
 340  * Issue1 to be fixed.
 341  */
 342 let fac1 = (x: TokenMatcheePair)=>{
 343     var ret = thenDo(thenDo(toSome(x), single),facAux);
 344     if(ret._tag == "Some"){
 345         console.log("777"+repr(tkTreeToSExp(ret.value.ast)));
 346         ret.value.ast = [applyToken, ret.value.ast[ret.value.ast.length-2],
 347                         ret.value.ast[ret.value.ast.length-1]];
 348         ret.value.ast;
 349         rearrangeTree(ret.value.ast);
 350         console.log("888"+repr(tkTreeToSExp(ret.value.ast)));
 351
 352     }
 353
 354     return ret;};
 355 let fac2 = single;
 356 let fac = orDo(fac1, fac2);
 357
 358
 359 /**
 360  * rearrangeTree : for applyToken subtree from right-combination to
 361  * left-combination
 362  * @input x a ast
 363  * @return another ast
 364  */
 365 function rearrangeTree(x: any) : any {
 366
 367         if (x !== undefined){
 368             for (var i=1;i<x.length;i++){
 369                 rearrangeTree(x[i]);
 370             }
 371             console.log("@@"+repr(x[0]));
 372
 373             if (x[0] == applyToken){
 374                 if (Array.isArray(x[2]) && x[2][0] == applyToken){
 375                     let rl = rearrangeTree(x[2][1]);
 376                     let rr = rearrangeTree(x[2][2]);
 377                     let l = rearrangeTree(x[1]);
 378                     x[0] = applyToken;
 379                     x[1] = [applyToken, l, rl];
 380                     x[2] = rr;
 381                     console.log("@@=="+repr(x));
 382
 383                     return x;
 384                 }
 385                 else{
 386                     x[0] = applyToken;
 387                     x[1] = rearrangeTree(x[1]);
 388                     x[2] = rearrangeTree(x[2]);
 389                     console.log("@@=="+repr(x));
 390
 391
 392                     return x;
 393                 }
 394             }
 395
 396             return x;
 397         }
 398     }
 399
 400
 401
 402
 403 /**
 404  *
 405  * term1 = fac (MUL | DIV) fac
 406  */
 407
 408 let term1 = midfix((x : TokenMatcheePair)=>
 409             thenDo(thenDo(thenDo(toSome(x), fac), orDo(tMul,tDiv)), fac), "term1");
 410
 411
 412 /**
 413  *
 414  * term2 = int MUL int
 415  */
 416 let term2 = fac;
 417
 418 /**
 419  * term = term1 | term2
 420  */
 421 let term = orDo(term1, term2);
 422
 423
 424 /**
 425  *
 426  * expr1 = term ADD term
 427  */
 428 let expr1 = midfix((x : TokenMatcheePair)=>
 429                 thenDo(thenDo(thenDo(toSome(x), term), orDo(tAdd,tSub)), term), "expr1");
 430 /**
 431  * expr2 = term
 432  */
 433 let expr2 = term;
 434
 435 /**
 436  * expr = expr1 | expr2
 437  */
 438 let expr = orDo(expr1, expr2);
 439
 440
 441
 442 let tokens = tk.tokenize("1");
 443 let tokens2 = tk.tokenize("1(2)");
 444 let tokens3 = tk.tokenize("1(2)(3)");
 445 let tokens4 = tk.tokenize("2()(4)");
 446
 447 //let tokens = tk.tokenize("(4-(3/4))");
 448 //tk.tokenize(argv[2]);
 449
 450 let tokensFiltered = tokens4.filter(
 451     (x)=>{return (x.type != tk.TokenType.NL
 452             && x.type != tk.TokenType.SP)});
 453
 454
 455
 456 let beta = expr({
 457         matched : [] ,
 458         remained : tokensFiltered,
 459         ast : []});
 460
 461
 462
 463 if (beta._tag == "Some"){
 464     beta.value.ast = rearrangeTree(beta.value.ast);
 465     console.log(tkTreeToSExp(beta.value.ast));
 466
 467 }
 468
 469 console.log("RESULT="+repr(beta));
 470