aureooms/texshake

import { ll1 , ast } from '@aureooms/js-grammar' ;
import tape from '@aureooms/js-tape' ;

import tokens from './tokens' ;
import grammar from './grammar' ;
import shaker from './transform/shaker' ;

export default async function shaketape ( inputTape , outputStream ) {

  const parser = ll1.from(grammar);
  const inputTokens = tokens(inputTape) ;
  const inputTokensTape = tape.fromAsyncIterable(inputTokens);
  const tree = parser.parse(inputTokensTape) ;

  const variables = new Map([
    ['if' , new Map([
      ['true', true],
      ['false', false],
    ])],
    ['cmd' , new Map([
    ])],
    ['env' , new Map([
    ])],
  ]) ;

  const ctx = {
    env : [ ] ,
    variables ,
    parser ,
  } ;

  const transformed = await ast.transform( tree , shaker , ctx ) ;
  const flattened = ast.flatten( transformed ) ;

  for await ( const leaf of flattened ) {
    if ( leaf.terminal === grammar.eof ) break ;
    outputStream.write(leaf.buffer) ;
  }

}