var fs = require('fs');
-import { argv, resourceUsage } from 'node:process';
-import * as tk from './tokenize.js';
+import jsTokens from "js-tokens";
import * as util from 'util';
-import { drawEllipsePath, reduceRotation } from 'pdf-lib';
-import { isTypedArray } from 'node:util/types';
-import { error } from 'node:console';
/**
- * debug reprensenting
+ *
+ * # REPRESENTATION
*/
-let repr = (x : any)=>{return util.inspect(x, {depth: null})};
-
/**
- * token tree type.
+ * convert a `tkTree` AST to S-expr string
+ * @param t the `tkTree`
+ * @returns S-expr String
*/
-type tkTree = tkTree[] | tk.Token
+export function tkTreeToSExp(t: tkTree): string{
+ var str = "";
-/**
- * concated 2 `tkTree`s
- * @param x the array to be concated
- * @param y the item or array to ve concated
- * @returns concated tkTree array, or thrown error if can't be concated.
- */
-function concat(x: tkTree, y:tkTree): tkTree[] {
- if (Array.isArray(x)){
- return x.concat(y);
+ if (Array.isArray(t)){
+ let strArray = t.map((x)=>tkTreeToSExp(x));
+ str = "(" + strArray.join(" ") + ")";
}else{
- throw new Error("the tkTree can't be concated, because it's not an array.");
-
+ if (t=== undefined){
+ str = "%undefined"
+ }else{
+ str = t.value;
+ }
}
-}
-function slice(x: tkTree, index?:number, end?:number): tkTree[] {
- if (Array.isArray(x)){
- return x.slice(index,end);
- }else{
- throw new Error("the tkTree can't be concated, because it's not an array.");
-
- }
+ return str;
}
+/**inspect the inner of the representation. */
+let repr = (x : any)=>{return util.inspect(x, {depth: null})};
+/**
+ *
+ * # TYPES
+ */
+
/**
- * TokenMatcheePair for tokens' parser combinator
+ * TokenPair for tokens' parser combinator
+ *
* matched: the matched (now and before) tokens
+ *
* remained: tokens to be matched
+ *
* ast: abstract syntax tree
*/
-export interface TokenMatcheePair {
- matched: tk.Token[]
- remained: tk.Token[]
+export interface TokenPair {
+ matched: jsTokens.Token[]
+ remained: jsTokens.Token[]
ast : tkTree[]
}
+export type Some<T> = { _tag: "Some"; value: T };
+export type None = { _tag: "None" };
+export type Maybe<T> = Some<T> | None;
-/**
- * @description
- * match one token type.
- *
- * it returns a function which test if the type of first token of the `remained` part of
- * the argument of the function is `typ` , if it's true, update the `TokenMatcheePair` wrapped
- * in `Some`. Otherwise, it returns `None`.
- * * @param typ : the type to be test.
- * @returns the updated `TokenMatcheePair` wrapped in `Some(x)` or `None`.
- */
-export function m1TType(typ: tk.TokenType):
- (m: TokenMatcheePair) => tk.Maybe<TokenMatcheePair> {
- return (m: TokenMatcheePair) => {
- if (m.remained.length == 0) {
- return { _tag: "None" };
- }
- /**
- * token to be matched
- * */
- const ttbm = m.remained[0];
-
- if (ttbm.type == typ) {
- let new_matched = m.matched.concat(ttbm);
- let result : tk.Some<TokenMatcheePair> = {
- _tag: "Some", value: {
- matched: new_matched,
- remained: m.remained.slice(1),
- ast: ([ttbm]),
- }
- };
- return result;
- }
- else {
- return { _tag: "None" };
- }
- }
-};
+type Token = jsTokens.Token;
+type tkTree = Token | tkTree[];
/**
- * type int
+ *
+ * # PARSER UNITS
*/
-let tInt = m1TType(tk.TokenType.INT);
-let tAdd = m1TType(tk.TokenType.I_ADD);
-let tMul = m1TType(tk.TokenType.I_MUL);
-
-
-argv.forEach((val, index) => {
- console.log(`${index}=${val}`);
-});
-
+function toSome<T>(x:T): Maybe<T>{
+ return {_tag: "Some", value: x};
+}
/**
* like `m ==> f` in ocaml
* @param f matching function
* @returns wrapped result
*/
-function thenDo(m : tk.Maybe<TokenMatcheePair>, f : Function){
+function thenDo(m : Maybe<TokenPair>, f : Function){
if (m._tag == "None"){
return m;
}else{
- var a : tk.Maybe<TokenMatcheePair> = f(m.value);
+ var a : Maybe<TokenPair> = f(m.value);
if (a._tag == "Some"){
- a.value.ast = concat(m.value.ast, a.value.ast);
+ a.value.ast = m.value.ast.concat(a.value.ast);
}
return a;
}
}
+/**
+ *
+ * @param m : the `TokenPair` to be consumed.
+ * @returns if the length of `m.remained` >= 1; consumes the matchee by 1 token
+ * and wraps it in `Some`,
+ * otherwise, returns `None`.
+ */
+export function matchAny(m: TokenPair): Maybe<TokenPair> {
+ if (m.remained.length >= 1) {
+ return {
+ _tag: "Some", value: {
+ matched: m.matched.concat(m.remained[0]),
+ remained: m.remained.slice(1),
+ ast : [m.remained[0]],
+ }
+ };
+ } else {
+ return { _tag: "None" };
+ }
+}
/**
* like `f1 | f2` in regex
* @returns wrapped result
*/
function orDo(f1 : Function, f2 : Function){
- return (x : TokenMatcheePair) =>{
- let res1 : tk.Maybe<TokenMatcheePair> = f1(x);
+ return (x : TokenPair) =>{
+ let res1 : Maybe<TokenPair> = f1(x);
if (res1._tag == "Some"){
return res1;
}else{
- let res2 : tk.Maybe<TokenMatcheePair> = f2(x);
+ let res2 : Maybe<TokenPair> = f2(x);
return res2;
}
- }
-
-}
-
-let midfix = (f : Function, signal? : string) => (x : TokenMatcheePair)=>{
- var a = f(x);
- if (a._tag == "Some"){
- let ast_head : tkTree[] = slice(a.value.ast,0,a.value.ast.length-3);
- let ast_tail : tkTree[] = slice(a.value.ast,a.value.ast.length-3);
- let new_ast = [ast_tail];
- a.value.ast = new_ast;
-
- console.log("+"+signal+"+"+repr(a));
-
-
- }
- return a;
+ }
}
/**
- *
- * fac1 = int MUL int
+ * like regex [^c]
+ * @param f input token function. one token only.
+ * @returns combined finction
*/
-//let fac1 = midfix((x : TokenMatcheePair)=>
-// thenDo(thenDo(thenDo(tk.toSome(x), tInt), tMul), tInt));
-
-let fac1 = (x : TokenMatcheePair) => {
- let a = midfix((x : TokenMatcheePair)=>
- thenDo(thenDo(thenDo(tk.toSome(x), tInt), tMul), tInt), "fac1")(x);
-
- return a;
+function notDo(f : Function){
+ return (x : TokenPair) =>{
+ let res1 : Maybe<TokenPair> = f(x);
+ if (res1._tag == "Some"){
+ return {_tag:"None"};
+ }else{
+ let res2 = matchAny(x);
+ return res2;
+ }
+ }
}
-
-/**
- *
- * fac2 = int MUL int
- */
-let fac2 = tInt;
+function matchToken(typeName : string, value? : string):
+ (t : TokenPair) => Maybe<TokenPair>{
+ return (t)=>{
+ let headToken = t.remained[0];
+ if (headToken.type != typeName){
+ return {_tag:"None"};
+ }else{
+ if (value === undefined || value == headToken.value){
+ let newTokenPair = {
+ matched: t.matched.concat(headToken),
+ remained: t.remained.slice(1),
+ ast : [headToken]
+ };
+ return {_tag : "Some", value : newTokenPair};
+ }else{
+ return {_tag:"None"};
+ }
+ };
+ }
+};
-/**
- * fac = fac1 | fac2
- */
-let fac = orDo(fac1, fac2);
-
/**
*
- * expr1 = fac ADD fac
+ * # TEST
*/
-let expr1 = midfix((x : TokenMatcheePair)=>
- thenDo(thenDo(thenDo(tk.toSome(x), fac), tAdd), fac), "expr1");
-/**
- * expr2 = fac
- */
-let expr2 = fac;
+const tokens = Array.from(jsTokens(
+`import foo from\t 'bar';
+import * as util from 'util';
-/**
- * expr = expr1 | expr2
- */
-let expr = orDo(expr1, expr2);
+花非花，霧\\{非霧 。{{foo();}}下
+一句`));
+console.log("RESULT="+repr(tokens));
-let tokens = tk.tokenize("2+3*4");//tk.tokenize(argv[2]);
-let tokensFiltered = tokens.filter(
- (x)=>{return (x.type != tk.TokenType.NL
- && x.type != tk.TokenType.SP)});
+var mainTokenPair : TokenPair = {
+ matched : [] ,
+ remained : tokens,
+ ast : []};
-let wrappedTokens : tk.Maybe<TokenMatcheePair> =
- tk.toSome({
- matched : [] ,
- remained : tokensFiltered,
- ast : []});
+let a = thenDo(thenDo(toSome(mainTokenPair), matchToken('IdentifierName')),
+ notDo(matchToken('Punctuator', ';')));
-let beta = expr({
- matched : [] ,
- remained : tokensFiltered,
- ast : []});
-
-console.log(repr(wrappedTokens));
-
-console.log(repr(beta));
+console.log("RESULT="+repr(a));
+if (a._tag == "Some"){
+ console.log("SEXP="+tkTreeToSExp(a.value.ast));
+}
projects / clo / blobdiff