moss/src/ast/rule.ts

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

export class Rule {
  public property: AST.Property;
  public values: AST.Value[];

  public constructor(
    property: AST.Property,
    values: AST.Value[]
  ) {
    this.property = property;
    this.values = values;
  }

  public compile(env: Env, opts: AST.Opts): string | EnvError {
    const wordSpacer = opts.prettyPrint ? ' ' : '';
    const indentSpacer = opts.prettyPrint ? '  ' + Array(opts.depth).fill(' ').join('') : '';
    const property = this.property.compile(env, opts);
    if (property instanceof EnvError) return property;
    const values: string[] = [];
    for (const value of this.values) {
      const compiledValue = value.compile(env, opts);
      if (compiledValue instanceof EnvError) return compiledValue;
      values.push(compiledValue);
    }
    return `${indentSpacer}${property}:${wordSpacer}${values.join(',')};`;
  }
}