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30 lines
916 B
JavaScript
30 lines
916 B
JavaScript
describe("compiler pass |reportLeftRecursion|", function() {
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var pass = PEG.compiler.passes.check.reportLeftRecursion;
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it("reports direct left recursion", function() {
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expect(pass).toReportError('start = start', {
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message: 'Left recursion detected for rule \"start\".'
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});
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});
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it("reports indirect left recursion", function() {
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expect(pass).toReportError([
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'start = stop',
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'stop = start'
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].join("\n"), {
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message: 'Left recursion detected for rule \"start\".'
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});
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});
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describe("in sequences", function() {
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it("reports left recursion only for the first element", function() {
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expect(pass).toReportError('start = start "a" "b"', {
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message: 'Left recursion detected for rule \"start\".'
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});
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expect(pass).not.toReportError('start = "a" start "b"');
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expect(pass).not.toReportError('start = "a" "b" start');
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});
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});
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});
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