"use strict";

var peg = require("../../../../lib/peg");

describe("compiler pass |reportDuplicateLabels|", function() {
  var pass = peg.compiler.passes.check.reportDuplicateLabels;

  describe("in a sequence", function() {
    it("reports labels duplicate with labels of preceding elements", function() {
      expect(pass).toReportError('start = a:"a" a:"a"', {
        message:  'Label "a" is already defined at line 1, column 9.',
        location: {
          start: { offset: 14, line: 1, column: 15 },
          end:   { offset: 19, line: 1, column: 20 }
        }
      });
    });

    it("doesn't report labels duplicate with labels in subexpressions", function() {
      expect(pass).not.toReportError('start = ("a" / a:"a" / "a") a:"a"');
      expect(pass).not.toReportError('start = (a:"a" { }) a:"a"');
      expect(pass).not.toReportError('start = ("a" a:"a" "a") a:"a"');
      expect(pass).not.toReportError('start = b:(a:"a") a:"a"');
      expect(pass).not.toReportError('start = $(a:"a") a:"a"');
      expect(pass).not.toReportError('start = &(a:"a") a:"a"');
      expect(pass).not.toReportError('start = !(a:"a") a:"a"');
      expect(pass).not.toReportError('start = (a:"a")? a:"a"');
      expect(pass).not.toReportError('start = (a:"a")* a:"a"');
      expect(pass).not.toReportError('start = (a:"a")+ a:"a"');
      expect(pass).not.toReportError('start = (a:"a") a:"a"');
    });
  });

  describe("in a choice", function() {
    it("doesn't report labels duplicate with labels of preceding alternatives", function() {
      expect(pass).not.toReportError('start = a:"a" / a:"a"');
    });
  });

  describe("in outer sequence", function() {
    it("reports labels duplicate with labels of preceding elements", function() {
      expect(pass).toReportError('start = a:"a" (a:"a")', {
        message:  'Label "a" is already defined at line 1, column 9.',
        location: {
          start: { offset: 15, line: 1, column: 16 },
          end:   { offset: 20, line: 1, column: 21 }
        }
      });
    });

    it("doesn't report labels duplicate with the label of the current element", function() {
      expect(pass).not.toReportError('start = a:(a:"a")');
    });

    it("doesn't report labels duplicate with labels of following elements", function() {
      expect(pass).not.toReportError('start = (a:"a") a:"a"');
    });
  });
});