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53 lines
1.6 KiB
JavaScript
53 lines
1.6 KiB
JavaScript
"use strict";
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const { expect, use } = require( "chai" );
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const helpers = require( "./helpers" );
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const pass = require( "pegjs" ).compiler.passes.check.reportIncorrectPlucking;
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use( helpers );
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describe( "compiler pass |reportIncorrectPlucking|", function () {
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function reports( error, edgecases ) {
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it( error.slice( 0, -1 ), () => {
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edgecases.forEach( grammar => expect( pass ).to.reportError( grammar, error ) );
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} );
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}
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reports( `"@" cannot be used with an action block.`, [
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`start1 = 'a' @'b' 'c' { /* empty action block */ }`,
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`start2 = 'a' @('b' @'c' { /* empty action block */ })`,
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] );
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reports( `"@" cannot be used on a semantic predicate.`, [
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`start1 = 'a' @&{ /* semantic_and */ } 'c'`,
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`start2 = 'a' @!{ /* semantic_not */ } 'c'`,
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] );
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it( "allows valid plucking", function () {
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expect( pass ).not.to.reportError( `
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start1 = @'1' // return '1'
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start2 = @'1' / @'2' // return '1' or '2'
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start2 = '1' @'2' '3' // return '2'
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start3 = '1' @b:'2' '3' // return '2', label "b" can be used in semantic predicates
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start4 = a:'1' @b:'2' '3' // return '2', labels "a" and "b" can be used in semantic predicates
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start5 = @'1' @'2' '3' // return ['1', '2']
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start6 = @'1' @b:'2' '3' // return ['1', '2'], label "b" can be used in semantic predicates
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start7 = a:'1' @'2' &{} // return '2' if the semantic predicate doesnt fail
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` );
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} );
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} );
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