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
 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
 223         if (counter <= 0){
 224             return { _tag: "None"};
 225         }
 226         let ast = wrappedOldX.value.ast ;
 227         wrappedOldX.value.ast =ast.slice(ast.length-counter);
 228         console.log(repr(wrappedOldX.value.ast));
 229
 230         return wrappedOldX; };
 231 }
 232
 233 /**
 234  * aux function for midfix operator
 235  * @param f function
 236  * @param signal the rule name
 237  * @returns
 238  */
 239 let midfix = (f : Function, signal? : string) => (x : TokenMatcheePair)=>{
 240     var a = f(x);
 241     if (a._tag == "Some"){
 242         let ast_tail : tkTree[] = slice(a.value.ast,a.value.ast.length-3);
 243         let new_ast = [ast_tail];
 244         a.value.ast = new_ast;
 245
 246         // console.log("+"+signal+"+"+repr(a));
 247
 248
 249     }
 250     return a;
 251 }
 252
 253 let circumfix = (f : Function, signal? : string) => (x : TokenMatcheePair)=>{
 254     var a = f(x);
 255     if (a._tag == "Some"){
 256         let inner = a.value.ast[a.value.ast.length-2];
 257         let ast_middle : tkTree[] = [inner];
 258         let new_ast = [ast_middle];
 259         a.value.ast = new_ast;
 260     }
 261     return a;
 262 }
 263
 264 /** single1 = tInt | "(" expr ")"*/
 265 let single1 = circumfix((x : TokenMatcheePair) =>
 266     thenDo(thenDo(thenDo(tk.toSome(x), tLParen), expr), tRParen), "fac1");
 267 let single2= tInt;
 268 let single = orDo(single1, single2);
 269
 270 /** func = single | single "(" single ")"
 271  * i.e.
 272  *
 273  * func = single |  func_aux ( int )
 274  *
 275 */
 276
 277 /** callees = "(" args ")" | "(" ")" */
 278
 279
 280 let callees1 = circumfix((x : TokenMatcheePair) =>
 281     thenDo(thenDo(thenDo(tk.toSome(x), tLParen), tInt), tRParen), "callees1");
 282 let callees2 = (x: TokenMatcheePair)=>{
 283     let ret = thenDo(thenDo(tk.toSome(x), tLParen), tRParen);
 284     if (ret._tag == "Some"){
 285         let new_ast : tkTree[] = [[]];
 286         ret.value.ast = new_ast;
 287     }
 288
 289     return ret};
 290
 291 let callees = orDo(callees1, callees2);
 292
 293
 294
 295 /** %apply R combinating token */
 296 let applyToken = {
 297     text: "%apply",
 298     type: tk.TokenType.ID,
 299     col: 0,
 300     ln: 0,
 301 }
 302
 303 /** facAux = callees facAux |  callees */
 304 let facAux1 = (x: TokenMatcheePair)=>{
 305     var ret = thenDo(thenDo(tk.toSome(x), callees), facAux);
 306     if (ret._tag == "Some"){
 307         console.log("1232345"+repr(tkTreeToSExp(ret.value.ast[ret.value.ast.length-1])));
 308     let last1  = ret.value.ast[ret.value.ast.length-1];
 309     let last2  = ret.value.ast[ret.value.ast.length-2];
 310
 311
 312     let b : tkTree[] = [applyToken];
 313     ret.value.ast = [b.concat([last2, last1])];
 314     console.log("11111"+repr(tkTreeToSExp(ret.value.ast)));
 315
 316     };
 317
 318 return ret;}
 319 let facAux2 = callees;
 320 let facAux =  orDo(facAux1, facAux2);
 321
 322
 323
 324 /** fac = single facAux | single
 325  * Issue1 to be fixed.
 326  */
 327 let fac1 = (x: TokenMatcheePair)=>{
 328     var ret = thenDo(thenDo(tk.toSome(x), single),facAux);
 329     if(ret._tag == "Some"){
 330         console.log("777"+repr(tkTreeToSExp(ret.value.ast)));
 331         ret.value.ast = [applyToken, ret.value.ast[ret.value.ast.length-2],
 332                         ret.value.ast[ret.value.ast.length-1]];
 333         ret.value.ast;
 334         rearrangeTree(ret.value.ast);
 335         console.log("888"+repr(tkTreeToSExp(ret.value.ast)));
 336
 337     }
 338
 339     return ret;};
 340 let fac2 = single;
 341 let fac = orDo(fac1, fac2);
 342
 343
 344 /**
 345  * rearrangeTree : for applyToken subtree from right-combination to
 346  * left-combination
 347  * @input x a ast
 348  * @return another ast
 349  */
 350 function rearrangeTree(x: any) : any {
 351
 352         if (x !== undefined){
 353             for (var i=1;i<x.length;i++){
 354                 rearrangeTree(x[i]);
 355             }
 356             console.log("@@"+repr(x[0]));
 357
 358             if (x[0] == applyToken){
 359                 if (Array.isArray(x[2]) && x[2][0] == applyToken){
 360                     let rl = rearrangeTree(x[2][1]);
 361                     let rr = rearrangeTree(x[2][2]);
 362                     let l = rearrangeTree(x[1]);
 363                     x[0] = applyToken;
 364                     x[1] = [applyToken, l, rl];
 365                     x[2] = rr;
 366                     console.log("@@=="+repr(x));
 367
 368                     return x;
 369                 }
 370                 else{
 371                     x[0] = applyToken;
 372                     x[1] = rearrangeTree(x[1]);
 373                     x[2] = rearrangeTree(x[2]);
 374                     console.log("@@=="+repr(x));
 375
 376
 377                     return x;
 378                 }
 379             }
 380
 381             return x;
 382         }
 383     }
 384
 385
 386
 387
 388 /**
 389  *
 390  * term1 = fac (MUL | DIV) fac
 391  */
 392
 393 let term1 = midfix((x : TokenMatcheePair)=>
 394             thenDo(thenDo(thenDo(tk.toSome(x), fac), orDo(tMul,tDiv)), fac), "term1");
 395
 396
 397 /**
 398  *
 399  * term2 = int MUL int
 400  */
 401 let term2 = fac;
 402
 403 /**
 404  * term = term1 | term2
 405  */
 406 let term = orDo(term1, term2);
 407
 408
 409 /**
 410  *
 411  * expr1 = term ADD term
 412  */
 413 let expr1 = midfix((x : TokenMatcheePair)=>
 414                 thenDo(thenDo(thenDo(tk.toSome(x), term), orDo(tAdd,tSub)), term), "expr1");
 415 /**
 416  * expr2 = term
 417  */
 418 let expr2 = term;
 419
 420 /**
 421  * expr = expr1 | expr2
 422  */
 423 let expr = orDo(expr1, expr2);
 424
 425
 426
 427 let tokens = tk.tokenize("1");
 428 let tokens2 = tk.tokenize("1(2)");
 429 let tokens3 = tk.tokenize("1(2)(3)");
 430 let tokens4 = tk.tokenize("2()");
 431
 432 //let tokens = tk.tokenize("(4-(3/4))");
 433 //tk.tokenize(argv[2]);
 434
 435 let tokensFiltered = tokens4.filter(
 436     (x)=>{return (x.type != tk.TokenType.NL
 437             && x.type != tk.TokenType.SP)});
 438
 439
 440
 441 let beta = expr({
 442         matched : [] ,
 443         remained : tokensFiltered,
 444         ast : []});
 445
 446
 447
 448 if (beta._tag == "Some"){
 449     beta.value.ast = rearrangeTree(beta.value.ast);
 450     console.log(tkTreeToSExp(beta.value.ast));
 451
 452 }
 453
 454 console.log("RESULT="+repr(beta));
 455