var fs = require('fs');
import jsTokens from "js-tokens";
import * as util from 'util';
-
+import * as p from 'typescript-parsec';
+import { Token } from 'typescript-parsec';
/**
*
* # REPRESENTATION
if (t=== undefined){
str = "%undefined"
}else{
- str = t.value;
+ str = t;
}
}
* # TYPES
*/
-/**
- * TokenPair for tokens' parser combinator
- *
- * matched: the matched (now and before) tokens
- *
- * remained: tokens to be matched
- *
- * ast: abstract syntax tree
- */
-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;
-type Token = jsTokens.Token;
-type tkTree = Token | tkTree[];
+type tkTree = string | tkTree[];
-/**
- *
- * # PARSER UNITS
- */
-function toSome<T>(x:T): Maybe<T>{
- return {_tag: "Some", value: x};
+enum TokenKind {
+ Seperator,
+ Semicolon,
+ Number,
+ Op,
+ ExprMark,
+ Paren,
+ SpaceNL,
+ Id,
+ Str,
}
/**
- * like `m ==> f` in ocaml
- * @param m matchee wrapped
- * @param f matching function
- * @returns wrapped result
+ * Parsing
*/
-function thenDo(m : Maybe<TokenPair>, f : Function){
- if (m._tag == "None"){
- return m;
- }else{
- var a : Maybe<TokenPair> = f(m.value);
- if (a._tag == "Some"){
- a.value.ast = m.value.ast.concat(a.value.ast);
- }
+const lexer = p.buildLexer([
+ [true, /^\d+(\.\d+)?/g, TokenKind.Number],
+ [true, /^\;/g, TokenKind.Semicolon],
+ [true, /^[-][-][-]/g, TokenKind.Seperator],
+ [true, /^[\+\-\*\/\&\|\!\^\<\>\~\=\?]+/g, TokenKind.Op],
+ [true, /^\@+/g, TokenKind.ExprMark],
+ [true, /^[()\[\]{}]/g, TokenKind.Paren],
+ [true, /^["]([\"]|[\\].)*["]/g, TokenKind.Str],
+ [true, /^[']([\']|[\\].)*[']/g, TokenKind.Str],
+ [true, /^[()\[\]{}]/g, TokenKind.Paren],
+ [true, /^[^\s\n\t\r;]+/g, TokenKind.Id],
+ [false, /^(\s|\n|\r|\t)+/g, TokenKind.SpaceNL]
+]);
- 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`.
+ * # TEST
*/
-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" };
- }
+const inputTxt=
+`import ast;
+---
+122`;
+
+
+const PROG = p.rule<TokenKind, tkTree>();
+const UNIT = p.rule<TokenKind, tkTree>();
+const IMPORTS = p.rule<TokenKind, tkTree>();
+const SEMICOLON = p.rule<TokenKind, tkTree>();
+
+
+let doubleMinus = { type: 'Punctuator', value: '--' };
+let doubleMinus2 = p.str('--');
+const TERM = p.rule<TokenKind, tkTree>();
+
+function applyUnit(value: Token<TokenKind.Number>): tkTree{
+ return value.text;
}
-/**
- * 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 : TokenPair) =>{
- let res1 : Maybe<TokenPair> = f1(x);
- if (res1._tag == "Some"){
- return res1;
- }else{
- let res2 : Maybe<TokenPair> = f2(x);
- return res2;
- }
- }
+function applySemiColon(value: Token<TokenKind.Semicolon>): tkTree{
+ return value.text;
}
-/**
- * like regex [^c]
- * @param f input token function. one token only.
- * @returns combined finction
- */
-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;
- }
- }
+function applyParts(first: tkTree,
+ second: [Token<TokenKind>, tkTree]):tkTree {
+ return ["%clo", first , second[1]];
}
-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"};
- }
- };
- }
-};
+
+function applyImports(input: [Token<TokenKind>,Token<TokenKind>[], tkTree]):tkTree{
+ let importTail = input[1].map(x=>x.text);
+ return ["import"].concat(importTail);
+};
+
/**
- *
- * # TEST
+ * PROG : IMPORTS '---' UNIT;
*/
-const tokens = Array.from(jsTokens(
-`import foo from\t 'bar';
-import * as util from 'util';
+PROG.setPattern(
+ p.lrec_sc(IMPORTS, p.seq(p.str('---'), UNIT), applyParts)
+)
-花非花，霧\\{非霧 。{{foo();}}下
-一句`));
+/**
+ * PROG : 'import' Id* SEMICOLON;
+ */
+IMPORTS.setPattern(
+ p.apply(p.seq(p.str('import'), p.rep_sc(p.tok(TokenKind.Id)), SEMICOLON) , applyImports)
+);
-console.log("RESULT="+repr(tokens));
+/**
+ * SEMICOLON : ';';
+ */
+SEMICOLON.setPattern(
+ p.apply(p.tok(TokenKind.Semicolon), applySemiColon)
+);
+/**
+ * UNIT : Number;
+ */
+UNIT.setPattern(
+ p.apply(p.tok(TokenKind.Number), applyUnit)
+);
-var mainTokenPair : TokenPair = {
- matched : [] ,
- remained : tokens,
- ast : []};
+let tree = p.expectSingleResult(p.expectEOF(PROG.parse(lexer.parse(inputTxt))));
-let a = thenDo(thenDo(toSome(mainTokenPair), matchToken('IdentifierName')),
- notDo(matchToken('Punctuator', ';')));
-console.log("RESULT="+repr(a));
-if (a._tag == "Some"){
- console.log("SEXP="+tkTreeToSExp(a.value.ast));
-}
+console.log("RESULT="+tkTreeToSExp(tree));
projects / clo / blobdiff