Method _parseExpansionCase

packages/compiler/src/ml_parser/parser.ts:244–289

()

  }

  private _parseExpansionCase(): html.ExpansionCase | null {
    const value = this._advance<ExpansionCaseValueToken>();

    // read {
    if (this._peek.type !== TokenType.EXPANSION_CASE_EXP_START) {
      this.errors.push(
        TreeError.create(null, this._peek.sourceSpan, `Invalid ICU message. Missing '{'.`),
      );
      return null;
    }

    // read until }
    const start = this._advance<ExpansionCaseExpressionStartToken>();

    const exp = this._collectExpansionExpTokens(start);
    if (!exp) return null;

    const end = this._advance<ExpansionCaseExpressionEndToken>();
    exp.push({type: TokenType.EOF, parts: [], sourceSpan: end.sourceSpan});

    // parse everything in between { and }
    const expansionCaseParser = new _TreeBuilder(exp, this.tagDefinitionResolver);
    expansionCaseParser.build();
    if (expansionCaseParser.errors.length > 0) {
      this.errors = this.errors.concat(expansionCaseParser.errors);
      return null;
    }

    const sourceSpan = new ParseSourceSpan(
      value.sourceSpan.start,
      end.sourceSpan.end,
      value.sourceSpan.fullStart,
    );
    const expSourceSpan = new ParseSourceSpan(
      start.sourceSpan.start,
      end.sourceSpan.end,
      start.sourceSpan.fullStart,
    );
    return new html.ExpansionCase(
      value.parts[0],
      expansionCaseParser.rootNodes,
      sourceSpan,
      value.sourceSpan,
      expSourceSpan,
    );
  }

  private _collectExpansionExpTokens(start: Token): Token[] | null {
    const exp: Token[] = [];