"use strict";

const chai = require( "chai" );
const helpers = require( "./helpers" );
const pass = require( "pegjs-dev" ).compiler.passes.check.reportDuplicateLabels;

chai.use( helpers );

const expect = chai.expect;

describe( "compiler pass |reportDuplicateLabels|", function () {

    describe( "in a sequence", function () {

        it( "reports labels duplicate with labels of preceding elements", function () {

            expect( pass ).to.reportError( "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 ).to.not.reportError( "start = ('a' / a:'a' / 'a') a:'a'" );
            expect( pass ).to.not.reportError( "start = (a:'a' { }) a:'a'" );
            expect( pass ).to.not.reportError( "start = ('a' a:'a' 'a') a:'a'" );
            expect( pass ).to.not.reportError( "start = b:(a:'a') a:'a'" );
            expect( pass ).to.not.reportError( "start = $(a:'a') a:'a'" );
            expect( pass ).to.not.reportError( "start = &(a:'a') a:'a'" );
            expect( pass ).to.not.reportError( "start = !(a:'a') a:'a'" );
            expect( pass ).to.not.reportError( "start = (a:'a')? a:'a'" );
            expect( pass ).to.not.reportError( "start = (a:'a')* a:'a'" );
            expect( pass ).to.not.reportError( "start = (a:'a')+ a:'a'" );
            expect( pass ).to.not.reportError( "start = (a:'a') a:'a'" );

        } );

    } );

    describe( "in a choice", function () {

        it( "doesn't report labels duplicate with labels of preceding alternatives", function () {

            expect( pass ).to.not.reportError( "start = a:'a' / a:'a'" );

        } );

    } );

    describe( "in outer sequence", function () {

        it( "reports labels duplicate with labels of preceding elements", function () {

            expect( pass ).to.reportError( "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 ).to.not.reportError( "start = a:(a:'a')" );

        } );

        it( "doesn't report labels duplicate with labels of following elements", function () {

            expect( pass ).to.not.reportError( "start = (a:'a') a:'a'" );

        } );

    } );

} );