X-Git-Url: https://git.kianting.info/?a=blobdiff_plain;f=src%2Findex.ts;h=4c1ce91924e0cfe689858d9ee19fc43e8890e0e2;hb=757abafe4c166ea808c8e3ee2bf95eed1bb930cf;hp=55e3d65db7b9894c9aead54e69cfa73e657a1520;hpb=cda463d89022d09a5273b59bcd3e776f1127697a;p=clo

diff --git a/src/index.ts b/src/index.ts
index 55e3d65..4c1ce91 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,38 +1,88 @@
 var fs = require('fs');
-
+import { argv, resourceUsage } from 'node:process';
 import * as tk from './tokenize.js';
+import * as util from 'util';
+import { drawEllipsePath, reduceRotation } from 'pdf-lib';
+import { isTypedArray } from 'node:util/types';
+import { error } from 'node:console';
+
+/**
+ * debug reprensenting
+ */
+let repr = (x : any)=>{return util.inspect(x, {depth: null})};
 
+/**
+ * token tree type.
+ */
+type tkTree = tkTree[] | tk.Token
 
+/**
+ * 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);
+    }else{
+        throw new Error("the tkTree can't be concated, because it's not an array.");
+        
+    }
+}
 
-let b : Array<tk.Token> = tk.tokenize("2+2");
+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.");
+        
+    }
+}
 
+/**
+ * TokenMatcheePair 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[]
+    ast : tkTree[]
 }
 
 /**
  * @description
- * it returns a function which test if the first char of the `remained` part of
- *  the argument of the function is `c`, if it's true, update the `MatchedPair` wrapped
+ * 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 t : the char to be test.
- * @returns the updated `MatchedPair` wrapped in `Some(x)` or `None`.
+ *  * @param typ : the type to be test.
+ * @returns the updated `TokenMatcheePair` wrapped in `Some(x)` or `None`.
  */
-export function match1token(t: tk.Token): (m: TokenMatcheePair) => tk.Maybe<TokenMatcheePair> {
+export function m1TType(typ: tk.TokenType):
+    (m: TokenMatcheePair) => tk.Maybe<TokenMatcheePair> {
     return (m: TokenMatcheePair) => {
         if (m.remained.length == 0) {
             return { _tag: "None" };
         }
-        const tokenToBeMatched = m.remained[0];
-        if (tokenToBeMatched === t) {
-            m.matched.push(tokenToBeMatched);
-            return {
+        /**
+         * 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: m.matched,
-                    remained: m.remained.slice(1)
+                    matched: new_matched,
+                    remained: m.remained.slice(1),
+                    ast:  ([ttbm]),
                 }
             };
+            return result;
         }
         else {
             return { _tag: "None" };
@@ -40,7 +90,135 @@ export function match1token(t: tk.Token): (m: TokenMatcheePair) => tk.Maybe<Toke
     }
 };
 
+/**
+ * type int
+ */
+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}`);
+});
+
+
+/**
+ * like `m ==> f` in ocaml
+ * @param m matchee wrapped
+ * @param f matching function
+ * @returns wrapped result
+ */
+function thenDo(m : tk.Maybe<TokenMatcheePair>, f : Function){
+    if (m._tag == "None"){
+        return m;
+    }else{
+        var a : tk.Maybe<TokenMatcheePair> = f(m.value);
+        if (a._tag == "Some"){
+            a.value.ast = concat(m.value.ast, a.value.ast);
+        }
+
+        return a;
+    }
+}
+
+/**
+ * like `f1 | f2` in regex
+ * @param f1 the first tried function
+ * @param f2 the second tried function
+ * @returns wrapped result
+ */
+function orDo(f1 : Function, f2 : Function){
+    return (x : TokenMatcheePair) =>{
+        let res1 : tk.Maybe<TokenMatcheePair> = f1(x);
+        if (res1._tag == "Some"){
+            return res1;
+        }else{
+            let res2 : tk.Maybe<TokenMatcheePair> = 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
+ */
+//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;
+}
+
+            
+/**
+ * 
+ * fac2 = int MUL int
+ */
+let fac2 = tInt;
+
+/**
+ * fac = fac1 | fac2
+ */
+let fac = orDo(fac1, fac2);
+ 
+
+/**
+ * 
+ * expr1 = fac ADD fac
+ */
+let expr1 = midfix((x : TokenMatcheePair)=>
+                thenDo(thenDo(thenDo(tk.toSome(x), fac), tAdd), fac), "expr1");
+/**
+ * expr2 = fac
+ */
+let expr2 = fac;
+
+/**
+ * expr = expr1 | expr2
+ */
+let expr = orDo(expr1, expr2);
+
+
+
+
+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)});
+
+let wrappedTokens : tk.Maybe<TokenMatcheePair> = 
+    tk.toSome({
+        matched : [] ,
+        remained : tokensFiltered,
+        ast : []});
+
+let beta = expr({
+        matched : [] ,
+        remained : tokensFiltered,
+        ast : []});
+
+console.log(repr(wrappedTokens));
 
+console.log(repr(beta));
 
-let c = tk.toSome(b);
-console.log(thenDo(c,match1token(tk.tokenize("+")[0])));
\ No newline at end of file