moss/src/compiler.ts

import * as AST from './ast';
import Env, { EnvError } from './env';

export interface CompilerOpts {
  prettyPrint?: boolean;
  env?: Env;
}

export default class Compiler {
  private tree: AST.Node[];
  private prettyPrint: boolean;
  private env: Env;

  public constructor(
    parserResult: { tree: AST.Node[]; module?: string },
    opts: CompilerOpts
  ) {
    this.tree = parserResult.tree;
    this.prettyPrint = opts.prettyPrint || false;
    this.env = opts.env || new Env();
  }

  public compile(): string | EnvError {
    const result = this.tree.map((node) =>
      node.compile(this.env, {
        depth: 0,
        prettyPrint: this.prettyPrint,
      })
    );

    const resultError = result.find((el) => el instanceof EnvError);
    if (resultError !== undefined) return resultError;

    const output = result.join(this.prettyPrint ? '\n' : '');
    return this.prettyPrint ? output.trim() : output;
  }
}