-/**
- * 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.");
-
- }
-}
-
-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[]
-}
-
-/**
- * convert a `tkTree` AST to S-expr string
- * @param t the `tkTree`
- * @returns S-expr String
- */
-export function tkTreeToSExp(t: tkTree): string{
- var str = "";
-
- if (Array.isArray(t)){
- let strArray = t.map((x)=>tkTreeToSExp(x));
- str = "(" + strArray.join(" ") + ")";
- }else{
- if (t=== undefined){
- str = "%undefined"
- }else{
- str = t.text;
- }
- }
-
- return str;
-}
-
-/**
- * @description
- * 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 typ : the type to be test.
- * @returns the updated `TokenMatcheePair` wrapped in `Some(x)` or `None`.
- */
-export function m1TType(typ: tk.TokenType):
- (m: TokenMatcheePair) => tk.Maybe<TokenMatcheePair> {
- return (m: TokenMatcheePair) => {
- if (m.remained.length == 0) {
- return { _tag: "None" };
- }
- /**
- * 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: new_matched,
- remained: m.remained.slice(1),
- ast: ([ttbm]),
- }
- };
- return result;
- }
- else {
- return { _tag: "None" };
- }
- }
-};
-
-/**
- * type int
- */
-let tInt = m1TType(tk.TokenType.INT);
-let tId = m1TType(tk.TokenType.ID);
-
-
-let tAdd = m1TType(tk.TokenType.I_ADD);
-let tSub = m1TType(tk.TokenType.I_SUB);
-let tMul = m1TType(tk.TokenType.I_MUL);
-let tDiv = m1TType(tk.TokenType.I_DIV);
-let tLParen = m1TType(tk.TokenType.L_PAREN);
-let tRParen = m1TType(tk.TokenType.R_PAREN);
-let tComma = m1TType(tk.TokenType.COMMA);
-let toSome = tk.toSome;
-
-
-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;
- }
-}