temp snapshot

[clo] / src / index.ts

diff --git a/src/index.ts b/src/index.ts
index 26cd10df0e081ec2ce445b72c26aeef17bdde0bb..55e3d65db7b9894c9aead54e69cfa73e657a1520 100644 (file)
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,104 +1,46 @@
 var fs = require('fs');
 
-type Some<T> = { _tag: "Some"; value: T };
-type None = {_tag: "None"};
+import * as tk from './tokenize.js';
 
-/**
- * @description Like the `Some(a)` and `None` in Rust.
- *
- * @example
- * ```ts
- * let exam1 : Maybe<Number> = { _tag: "Some", value: 12 };
- * let exam2 : Maybe<Number> = None;
- * ```
- */
-export type Maybe<T> = Some<T> | None;
 
 
-/**
- * @description
- * the pair of the string to be matched later and the string that have been matched
- * @param matched : string have been matched
- * @param remained : string will be tested whether it'll be matched.
- */
-export type MatcheePair = {matched : string; remained : string};
+let b : Array<tk.Token> = tk.tokenize("2+2");
+
+export interface TokenMatcheePair {
+    matched: tk.Token[]
+    remained: tk.Token[]
+}
 
 /**
  * @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
  * in `Some`. Otherwise, it returns `None`.
- *  * @param c : the char to be test.
+ *  * @param t : the char to be test.
  * @returns the updated `MatchedPair` wrapped in `Some(x)` or `None`.
  */
-export function match1Char(c : string) : (m: MatcheePair) => Maybe<MatcheePair> {
-    return (m : MatcheePair)=>{
-        const charToBeMatched = m.remained[0];
-        if (charToBeMatched === c){
-            return {_tag: "Some", value :{
-                    matched : m.matched + charToBeMatched,
-                    remained : m.remained.substring(1)}};
+export function match1token(t: tk.Token): (m: TokenMatcheePair) => tk.Maybe<TokenMatcheePair> {
+    return (m: TokenMatcheePair) => {
+        if (m.remained.length == 0) {
+            return { _tag: "None" };
         }
-        else{
-            return {_tag: "None"};
+        const tokenToBeMatched = m.remained[0];
+        if (tokenToBeMatched === t) {
+            m.matched.push(tokenToBeMatched);
+            return {
+                _tag: "Some", value: {
+                    matched: m.matched,
+                    remained: m.remained.slice(1)
+                }
+            };
         }
-    }
-};
-
-/**
- * @description
- * it returns a function which test if the first char of the `remained` part of
- *  the argument of the function is between `l` and `u`, if it's true, update the `MatchedPair` wrapped
- * in `Some`. Otherwise, it returns `None`.
- *  * @param l : lower bound char, 1-char string
- *  * @param u : upper bound char, 1-char string
- * @returns the updated `MatchedPair` wrapped in `Some(x)` or `None`.
- */
-export function matchRange(l : string, u : string) : (m: MatcheePair) => Maybe<MatcheePair> {
-    let lCodepoint = charToCodepoint(l);
-    let uCodepoint = charToCodepoint(u);
-    if (l > u){
-        throw new Error("Error: the codepoint of `"+l+"` is not smaller than `"+u+"`)");
-    }
-    return (m : MatcheePair)=>{
-
-        const charToBeMatched = m.remained[0];
-        const codePointToBeMatched = charToCodepoint(charToBeMatched);
-        if (codePointToBeMatched >= lCodepoint && codePointToBeMatched <= uCodepoint){
-            return {_tag: "Some", value :{
-                    matched : m.matched + charToBeMatched,
-                    remained : m.remained.substring(1)}};
-        }
-        else{
-            return {_tag: "None"};
+        else {
+            return { _tag: "None" };
         }
     }
 };
 
-/**
- * convert the one-char string to codepoint.
- * @param s : the string to code point.
- * @returns if `s.length > 1` return error; otherwise, return the codepoint of `s`.
- */
-export function charToCodepoint(s : string): number{
-    if (s.length > 1){
-        throw new Error("Error: the length of input string for "+s+ "is "+s.length+`,
-        however, it should be 1.`);
-    }else{
-        return s.charCodeAt(0);
-    }
-}
 
-/**
- *  @description thendo(input, f, ...) like
- * a ==> f
- */
-export function thenDo<T>(input : Maybe<T>, f : Function) : Maybe<T>{
-    if (input._tag == "None"){
-        return input;
-    }
-    else{
-        let inner = input.value;
-        return f(inner);
-    }
-}
+
+let c = tk.toSome(b);
+console.log(thenDo(c,match1token(tk.tokenize("+")[0])));
\ No newline at end of file