+import { match } from "assert";
+
var fs = require('fs');
export type Some<T> = { _tag: "Some"; value: T };
/**
* @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.
+ * @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 type MatcheePair = {matched : string; remained : string};
+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, // ->
+
+}
+
+/**
+ * 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,
+}
/**
* @description
{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 = (x : MatcheePair) =>
- { let wrapped_x = toSome(x);
- let plusMinus = orDo(match1Char('+'), match1Char('-')); // ([+]|[-])
- let d = matchRange('0','9'); // \d
- return thenDo(thenDo(thenDo(wrapped_x,
- zeroOrOnceDo(plusMinus)),d),
- zeroOrMoreDo(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});
+
+ }
+ 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));
+ }
+
+ return token_list;
}
- console.log(input+", result: ");
- console.log(thenDo(input_matchee_pair, integer));
+
+ console.log(term([], input_matchee_pair));
+
// TODO: id, string, space, basic operator, 3 marks: @, {, }.
}
-tokenize("+123");
-tokenize("123");
-tokenize("-123");
-tokenize(" 123");
-tokenize("c123");
+
projects / clo / blobdiff