moss/src/ast/mediaQuery.ts

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

export class MediaQuery {
  public predicate: AST.MediaQueryPredicate;
  public children: AST.Node[];

  public constructor(predicate: AST.MediaQueryPredicate, children: AST.Node[]) {
    this.predicate = predicate;
    this.children = children;
  }

  public compile(env: Env, opts: AST.Opts): string | EnvError {
    const lineSpacer = opts.prettyPrint ? '\n' : '';
    const wordSpacer = opts.prettyPrint ? ' ' : '';
    const predicate = this.predicate.compile(env, opts);

    const children = this.children.map((child) =>
      child.compile(env, { ...opts, depth: opts.depth + 2 })
    );
    const childrenError = children.find((node) => node instanceof EnvError);
    if (childrenError instanceof EnvError) return childrenError;

    return `@media(${predicate})${wordSpacer}{${lineSpacer}${children.join(
      lineSpacer
    )}${lineSpacer}}`;
  }
}