X-Git-Url: https://git.kianting.info/?a=blobdiff_plain;f=src%2Findex.ts;h=55e3d65db7b9894c9aead54e69cfa73e657a1520;hb=cda463d89022d09a5273b59bcd3e776f1127697a;hp=5ca3a12b008cf290bfdc3a21675da93324132912;hpb=aefa3e14791ba05b7959572338ad2377f528ab0b;p=clo

diff --git a/src/index.ts b/src/index.ts
index 5ca3a12..55e3d65 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,115 +1,14 @@
-import { match } from "assert";
-
 var fs = require('fs');
 
-export type Some<T> = { _tag: "Some"; value: T };
-export type None = {_tag: "None"};
-
+import * as tk from './tokenize.js';
 
-/**
- * wrap a x in a `Some(T)`
- * @param x : variable to be wrapped.
- * @returns wrapped `x`.
- */
-function toSome<T>(x: T): Some<T>{
-    return  { _tag: "Some", value: x};  
-}
-/**
- * @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
- * @var matched : have been matched
- * @var remained : will be tested whether it'll be matched.
- * @var matched_type (optional): the type of the matched string
-*/
-export interface MatcheePair {
-    matched : string
-    remained : string
-    matched_type?: TokenType 
-}
-
-/**
- * The types of Token
- *    NL, // newline
- * 
- *   SP, // half-width space and tab
- * 
- * ID, // identifier
- * 
- * STR, // string
- * 
- * OP, // operator or something like it
- * 
- * FLO, // float num
- * 
- * INT, // integer
- * 
- * I_* // integer manipulation
- * 
- * F_* // float manipulation
- * 
- * SEMI_C// semi-colon
- */
-export enum TokenType{
-    NL, // newlinw
-    SP, // half-width space and tab
-    ID, // identifier
-    STR, // string
-    FLO, // float num
-    INT, // integer
-    F_ADD,
-    F_SUB,
-    F_MUL,
-    F_DIV,
-    I_ADD, 
-    I_SUB, 
-    I_MUL, 
-    I_DIV,
-    L_PAREN, // (
-    R_PAREN, // )
-    L_BRACK, // [
-    R_BRACK, // ]
-    L_BRACE, // {
-    R_BRACE, // }
-    COMMA, // ,
-    DOT, // .
-    COLON, // :
-    SEMI_C, // ;
-    AT, // @
-    HASH, // #
-    EQ, // ==
-    SET, // =
-    GT, // > greater than
-    LT, // <less than
-    GE, // >=
-    LE, // <=
-    R_ARROW, // ->
-
-}
+let b : Array<tk.Token> = tk.tokenize("2+2");
 
-/**
- * tokenized token.
- * @var text : the content text
- * @var type (optional): the type of the token
- * @var col : the column number
- * @var ln : the line number
- */
-export interface Token{
-    text: string,
-    type?: TokenType,
-    col: number,
-    ln: number,
+export interface TokenMatcheePair {
+    matched: tk.Token[]
+    remained: tk.Token[]
 }
 
 /**
@@ -117,396 +16,31 @@ export interface Token{
  * 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)=>{
-        if (m.remained.length == 0){
+export function match1token(t: tk.Token): (m: TokenMatcheePair) => tk.Maybe<TokenMatcheePair> {
+    return (m: TokenMatcheePair) => {
+        if (m.remained.length == 0) {
             return { _tag: "None" };
         }
-        const charToBeMatched = m.remained[0];
-        if (charToBeMatched === c){
-            return {_tag: "Some", value :{
-                    matched : m.matched + charToBeMatched,
-                    remained : m.remained.substring(1)}};
-        }
-        else{
-            return {_tag: "None"};
-        }
-    }
-};
-
-/**
- * 
- * @param m : the `MatcheePair` to be consumed.
- * @returns if the length of `m.remained` >= 1; consumes the matchee by 1 char and wraps it in `Some`,
- * otherwise, returns `None`.
- */
-export function matchAny(m : MatcheePair) : Maybe<MatcheePair>{
-    if (m.remained.length >= 1){
-        return {_tag: "Some", value :{
-            matched : m.matched + m.remained[0],
-            remained : m.remained.substring(1)}};
-    }else{
-        return {_tag: "None"};
-    }
-}
-
-/**
- * @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)=>{
-        if (m.remained.length < 1){
-            return {_tag : "None"};
-        }
-        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"};
-        }
-    }
-};
-
-/**
- * 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
- * @param input: the wrapped input. 
- * @param f: the function to be applied.
- * 
- * @returns:the applied wrapped result `MatcheePair`.
- */
-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);
-    }
-}
-
-/**
- * @description "or", like the regex `( f1 | f2 )` . 
- * It returns a function `f` of which the argument is`x`.
- * if `f1(x)` is None, then `f` returns `f2(x)`. Otherwise, 
- * `F` returns `f1(x)`.
- * @param f1 : 1st function to be compared
- * @param f2 : 2nd function to be compared
- * @returns:the combined function
- */
-export function orDo<T>(f1 : Function, f2: Function) : (x : T ) => Maybe<T>{
-    return (x) => {
-        let f1x : Maybe<T> = (f1(x));
-        {
-            if (f1x._tag == "None"){
-                return f2(x);
-            }
-            else{
-                return f1x;
-            }
-        }
-    };
-}
-
-
-/**
-* @description repeating matching function `f` 
-* zero or more times, like the asterisk `*` in regex `f*` . 
-* @param f : the function to be repeated 0+ times.
-* @returns:the combined function
-*/
-export function zeroOrMoreDo<T>(f : Function): (x : T) => Maybe<T>{
-    return (x)=>{
-        var wrapped_old_x : Maybe<T> = {_tag: "Some", value : x};
-        var wrapped_new_x : Maybe<T> = wrapped_old_x;
-
-        while (wrapped_new_x._tag != "None"){
-            wrapped_old_x = wrapped_new_x;
-            wrapped_new_x = thenDo(wrapped_old_x, f);
-        };
-
-        return wrapped_old_x;
-    };
-}
-
-/**
-* @description Not. like the `^` inside regex of [^f].
-* returns a function `F(x)` such that if  `f(x)` is `None`,
-* returns the x consuming a char; if `f(x)` is not None, F(x)
-* returns `None`.
-* @param f: the function forbidden to be matched.
-* @returns: combined function `F`.
-*/
-export function notDo<T>(f : Function): (x : T) => Maybe<T>{
-    return (x)=>{
-        let wrapped_x : Maybe<T> = {
-            _tag : "Some",
-            value : x
-        };
-        let f_x = thenDo(wrapped_x, f);
-        
-        if (f_x._tag != "None"){
-            return {_tag:"None"};
-        }else{
-            return thenDo(wrapped_x, matchAny);
-        }
-    };
-}
-
-/**
- * if `x` is matched by `f` once, returns `f(x)`. Otherwise, 
- * returns x
- * similar to `?` in regex `f?`.
- * @param f : the function to be matched
- * @returns return wrapped f(x)
- */
-export function zeroOrOnceDo<T>(f : Function): (x : T) => Maybe<T>{
-    return (x)=>{
-        var wrapped_old_x : Maybe<T> = {_tag: "Some", value : x};
-        var wrapped_new_x = thenDo(wrapped_old_x, f);
-
-        if (wrapped_new_x._tag != "None"){
-            return wrapped_new_x;
-        }else{
-        return wrapped_old_x;
-        }
-    };
-}
-
-
-export function tokenize(input : string){
-    var input_matchee_pair : Maybe<MatcheePair> = toSome(
-        {matched:"",
-        remained: input});
-
-    /**
-     * generate a parser of a basic term (b_term)
-     * @param pattern : the pattern parser
-     * @param token_type : the returning token type
-     * @returns a wrapped parser.
-     */
-    function bTerm(pattern : Function, token_type : TokenType){
-        return (x : MatcheePair) =>{
-            let wrapped_x = toSome(x);
-            let result = pattern(wrapped_x); 
-            if (result._tag == "Some") {
-                result.value.matched_type = token_type;
-            }
-            return result;
-        }
-    }
-
-    let d = matchRange('0','9'); // \d
-    // [+-]
-    let plusMinus = orDo(match1Char('+'), match1Char('-'));
-    let s_aux = orDo(match1Char(' '), match1Char('\t')); // (" " | "\t")
-
-    // integer = ([+]|[-])?\d\d*
-    let integer = bTerm((x : Maybe<MatcheePair>)=>
-                            thenDo(thenDo(thenDo(x, 
-                            zeroOrOnceDo(plusMinus)),d),
-                            zeroOrMoreDo(d)),
-                        TokenType.INT);
-    // space = [ \t]+
-    let space = bTerm((x : Maybe<MatcheePair>)=>
-        thenDo(thenDo(x, s_aux), zeroOrMoreDo(s_aux)),
-        TokenType.INT);
-
-    // newline = \r?\n
-    let newline = bTerm((x : Maybe<MatcheePair>)=>
-    thenDo(thenDo(x, 
-        zeroOrOnceDo(match1Char('\r'))),
-        match1Char('\n')),
-        TokenType.NL);
-
-    // [_A-Za-z]
-    let idHead = orDo(orDo(matchRange('a','z'),matchRange('A','Z')), match1Char('_'));
-    let idRemained = orDo(idHead, matchRange('0','9')); // [_A-Za-z0-9]
-
-    // id = [_A-Za-z][_A-Za-z0-9]*
-    let id = bTerm((x : Maybe<MatcheePair>)=>
-        thenDo(thenDo(x, 
-            idHead),
-            zeroOrMoreDo(idRemained)),
-            TokenType.ID);
-    let doublequote = match1Char("\"");
-    // [\\][\"]
-    let escapeReverseSlash = (x:MatcheePair)=>
-        thenDo(thenDo(toSome(x), match1Char("\\")), doublequote);
-    // ([\\]["]|[^\"])*
-    let stringInnerPattern = zeroOrMoreDo(
-        orDo(escapeReverseSlash, notDo(match1Char("\""))));
-
-    // str = ["]([\\]["]|[^"])*["]
-    let str = bTerm((x : Maybe<MatcheePair>)=>
-        thenDo(thenDo(thenDo(x,doublequote),
-        stringInnerPattern),doublequote),
-        TokenType.STR);
-
-    // float = [+-]?\d+[.]\d+
-    function floatPattern(x : Maybe<MatcheePair>){
-        return thenDo(thenDo(thenDo(thenDo(thenDo(thenDo(x, 
-        zeroOrOnceDo(plusMinus)),d),
-        zeroOrMoreDo(d)),
-        match1Char(".")),d),
-        zeroOrMoreDo(d))};
-    let float = bTerm(floatPattern, TokenType.FLO);
-
-    // operators
-    // +.
-    let floatAdd = bTerm((x : Maybe<MatcheePair>)=>
-        thenDo(thenDo(x, match1Char("+")),match1Char(".")),
-        TokenType.F_ADD);
-    // +.
-    let floatSub = bTerm((x : Maybe<MatcheePair>)=>
-        thenDo(thenDo(x, match1Char("-")),match1Char(".")),
-        TokenType.F_SUB);  
-
-    // *.
-    let floatMul = bTerm((x : Maybe<MatcheePair>)=>
-        thenDo(thenDo(x, match1Char("*")),match1Char(".")),
-        TokenType.F_MUL);
-
-    // /.
-    let floatDiv = bTerm((x : Maybe<MatcheePair>)=>
-        thenDo(thenDo(x, match1Char("/")),match1Char(".")),
-        TokenType.F_DIV);
-
-    // ==
-    let eq = bTerm((x : Maybe<MatcheePair>)=>
-    thenDo(thenDo(x, match1Char("=")),match1Char("=")),
-    TokenType.EQ);
-
-    // >=
-    let ge = bTerm((x : Maybe<MatcheePair>)=>
-    thenDo(thenDo(x, match1Char(">")),match1Char("=")),
-    TokenType.GE);
-
-    // <=
-    let le = bTerm((x : Maybe<MatcheePair>)=>
-    thenDo(thenDo(x, match1Char("<")),match1Char("=")),
-    TokenType.LE);
-
-    // ->
-    let rightArrow = bTerm((x : Maybe<MatcheePair>)=>
-    thenDo(thenDo(x, match1Char("-")),match1Char(">")),
-    TokenType.R_ARROW);
-    
-    /**
-     * unary operator : generating the pattern of basic unary operator
-     * @param char : uniry char for the operator
-     * @param token_type : the corresponding token_type
-     */
-    function unaryOp(char: string, token_type: TokenType) {
-        return bTerm((x : Maybe<MatcheePair>)=>thenDo(x, match1Char(char)),
-        token_type);};
-
-    let intAdd = unaryOp('+', TokenType.I_ADD);
-    let intSub = unaryOp('-', TokenType.I_SUB);
-    let intMul = unaryOp('*', TokenType.I_MUL);
-    let intDiv = unaryOp('/', TokenType.I_DIV);
-    let lParen = unaryOp('(', TokenType.L_PAREN);
-    let rParen = unaryOp(')', TokenType.R_PAREN);
-    let lBracket = unaryOp('[', TokenType.L_BRACK);
-    let rBracket = unaryOp(']', TokenType.R_BRACK);
-    let lBrace = unaryOp('{', TokenType.L_BRACE);
-    let rBrace = unaryOp('}', TokenType.R_BRACE);
-    let comma = unaryOp(',', TokenType.COMMA);
-    let dot = unaryOp('.', TokenType.DOT);
-    let colon = unaryOp(':', TokenType.COLON);
-    let semicolon = unaryOp(';', TokenType.SEMI_C);
-    let at = unaryOp('@', TokenType.AT);
-    let hash = unaryOp('#', TokenType.HASH);
-    let set = unaryOp('=', TokenType.SET);
-    let greaterthan = unaryOp('>', TokenType.GT);
-    let lessthan = unaryOp('<', TokenType.LE);
-
-
-    let term = (token_list : Array<Token>, x :  Some<MatcheePair>)=>{
-        var ln = 1;
-        var col = 0;
-        var old_x  = x;
-        let term_list = [float, newline, space, integer,str,  id,
-            floatAdd, floatSub, floatMul, floatDiv,
-            intAdd, intSub, intMul, intDiv,
-            eq, ge, le, rightArrow,
-            lParen, rParen, lBracket, rBracket, lBrace, rBrace,
-            comma, dot, colon, semicolon, at, hash,
-            set,greaterthan, lessthan];
-        let term_aux = term_list.reduce((x,y)=> orDo(x,y));
-
-        var new_x : Maybe<MatcheePair> = thenDo(old_x, term_aux);
-        while (new_x._tag != "None"){
-            if (new_x.value.matched_type != TokenType.NL){
-                col += new_x.value.matched.length;
-                token_list.push({text : new_x.value.matched,
-                                type: new_x.value.matched_type,
-                                ln : ln,
-                                col : col});
-                
+        const tokenToBeMatched = m.remained[0];
+        if (tokenToBeMatched === t) {
+            m.matched.push(tokenToBeMatched);
+            return {
+                _tag: "Some", value: {
+                    matched: m.matched,
+                    remained: m.remained.slice(1)
                 }
-            else{
-                col = 0;
-                ln += 1;                
-
-                token_list.push({text : new_x.value.matched,
-                    type: new_x.value.matched_type,
-                    ln : ln,
-                    col : col});
-    
-            }
-
-
-            old_x = toSome({matched : "",
-                            remained : new_x.value.remained});
-            new_x = thenDo(old_x, term_aux);
+            };
         }
-
-        if (old_x.value.remained.length){
-            console.log(token_list);
-            throw new Error("the code can't be tokenized is near Ln. "+ln+", Col."+col
-                            +", starting with "+ old_x.value.remained.substring(0,10));
+        else {
+            return { _tag: "None" };
         }
-
-        return token_list;
     }
+};
 
-    console.log(term([], input_matchee_pair));
-
-    // TODO: id, string, space, basic operator, 3 marks: @, {, }.
-
-}
 
 
+let c = tk.toSome(b);
+console.log(thenDo(c,match1token(tk.tokenize("+")[0])));
\ No newline at end of file