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pegjs/test/spec/unit/compiler/passes/report-unused-rules.spec.js

65 lines
1.4 KiB
JavaScript

"use strict";
const chai = require( "chai" );
const helpers = require( "./helpers" );
const pass = require( "pegjs-dev" ).compiler.passes.check.reportUnusedRules;
chai.use( helpers );
const expect = chai.expect;
describe( "compiler pass |reportUnusedRules|", function () {
it( "should report rules that are not referenced", function () {
expect( pass ).to.reportWarning(
`
start = .
unused = .
`,
`Rule "unused" is not referenced.`
);
expect( pass ).to.reportWarning(
`
start = .
unused = .
used = .
`,
[
`Rule "used" is not referenced.`,
`Rule "unused" is not referenced.`
]
);
} );
it( "does not report rules that are referenced", function () {
expect( pass ).not.to.reportWarning( `start = .` );
expect( pass ).not.to.reportWarning( `
start = used
used = .
` );
} );
it( "does not report any rules that the generated parser starts parsing from", function () {
expect( pass ).not.to.reportWarning(
`
a = "x"
b = a
c = .+
`,
null,
{
allowedStartRules: [ "b", "c" ]
}
);
} );
} );