ramda#zip TypeScript Examples

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Example #1
Source File: substitute.ts    From interpreters with MIT License 6 votes vote down vote up 
substitute = (body: CExp[], vars: string[], exps: CExp[]): CExp[] => {
    const subVarRef = (e: VarRef): CExp => {
        const pos = indexOf(e.var, vars);
        return ((pos > -1) ? exps[pos] : e);
    };
    
    const subProcExp = (e: ProcExp): ProcExp => {
        const argNames = map((x) => x.var, e.args);
        const subst = zip(vars, exps);
        const freeSubst = filter((ve) => !includes(first(ve), argNames), subst);
        return makeProcExp(
            e.args,
            substitute(
                e.body,
                map((x: KeyValuePair<string, CExp>) => x[0], freeSubst),
                map((x: KeyValuePair<string, CExp>) => x[1], freeSubst)
            )
        );
    };
    
    const sub = (e: CExp): CExp => isNumExp(e) ? e :
        isBoolExp(e) ? e :
        isPrimOp(e) ? e :
        isLitExp(e) ? e :
        isStrExp(e) ? e :
        isVarRef(e) ? subVarRef(e) :
        isIfExp(e) ? makeIfExp(sub(e.test), sub(e.then), sub(e.alt)) :
        isProcExp(e) ? subProcExp(e) :
        isAppExp(e) ? makeAppExp(sub(e.rator), map(sub, e.rands)) :
        e;
    
    return map(sub, body);
}