X-Git-Url: https://git.kianting.info/?a=blobdiff_plain;f=src%2Findex.ts;h=60e74871dc96261bf3ddcb2eb4d3b332952f8f57;hb=fed01e9044149985b3df74a9225ce68805b8f478;hp=4c1ce91924e0cfe689858d9ee19fc43e8890e0e2;hpb=f801ef14fc25ae122aaef4aede639ddb9b37006a;p=clo

diff --git a/src/index.ts b/src/index.ts
index 4c1ce91..60e7487 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,107 +1,68 @@
 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
@@ -109,18 +70,38 @@ argv.forEach((val, index) => {
  * @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
@@ -129,96 +110,81 @@ function thenDo(m : tk.Maybe<TokenMatcheePair>, f : Function){
  * @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));
+}