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116 lines
4.0 KiB
JavaScript
116 lines
4.0 KiB
JavaScript
"use strict";
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var peg = require("../../../../lib/peg");
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describe("compiler pass |reportInfiniteRecursion|", function() {
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var pass = peg.compiler.passes.check.reportInfiniteRecursion;
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it("reports direct left recursion", function() {
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expect(pass).toReportError('start = start', {
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message: 'Possible infinite loop when parsing (left recursion: start -> start).',
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location: {
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start: { offset: 8, line: 1, column: 9 },
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end: { offset: 13, line: 1, column: 14 }
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}
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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: 'Possible infinite loop when parsing (left recursion: start -> stop -> start).',
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location: {
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start: { offset: 21, line: 2, column: 9 },
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end: { offset: 26, line: 2, column: 14 }
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}
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});
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});
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describe("in sequences", function() {
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it("reports left recursion if all preceding elements match empty string", function() {
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expect(pass).toReportError('start = "" "" "" start');
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});
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it("doesn't report left recursion if some preceding element doesn't match empty string", function() {
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expect(pass).not.toReportError('start = "a" "" "" start');
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expect(pass).not.toReportError('start = "" "a" "" start');
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expect(pass).not.toReportError('start = "" "" "a" start');
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});
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/* Regression test for #359. */
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it("reports left recursion when rule reference is wrapped in an expression", function() {
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expect(pass).toReportError('start = "" start?');
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});
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it("computes expressions that always consume input on success correctly", function() {
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expect(pass).toReportError([
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'start = a start',
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'a "a" = ""'
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].join('\n'));
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expect(pass).not.toReportError([
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'start = a start',
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'a "a" = "a"'
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].join('\n'));
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expect(pass).toReportError('start = ("" / "a" / "b") start');
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expect(pass).toReportError('start = ("a" / "" / "b") start');
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expect(pass).toReportError('start = ("a" / "b" / "") start');
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expect(pass).not.toReportError('start = ("a" / "b" / "c") start');
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expect(pass).toReportError('start = ("" { }) start');
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expect(pass).not.toReportError('start = ("a" { }) start');
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expect(pass).toReportError('start = ("" "" "") start');
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expect(pass).not.toReportError('start = ("a" "" "") start');
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expect(pass).not.toReportError('start = ("" "a" "") start');
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expect(pass).not.toReportError('start = ("" "" "a") start');
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expect(pass).toReportError('start = a:"" start');
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expect(pass).not.toReportError('start = a:"a" start');
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expect(pass).toReportError('start = $"" start');
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expect(pass).not.toReportError('start = $"a" start');
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expect(pass).toReportError('start = &"" start');
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expect(pass).toReportError('start = &"a" start');
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expect(pass).toReportError('start = !"" start');
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expect(pass).toReportError('start = !"a" start');
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expect(pass).toReportError('start = ""? start');
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expect(pass).toReportError('start = "a"? start');
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expect(pass).toReportError('start = ""* start');
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expect(pass).toReportError('start = "a"* start');
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expect(pass).toReportError('start = ""+ start');
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expect(pass).not.toReportError('start = "a"+ start');
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expect(pass).toReportError('start = ("") start');
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expect(pass).not.toReportError('start = ("a") start');
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expect(pass).toReportError('start = &{ } start');
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expect(pass).toReportError('start = !{ } start');
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expect(pass).toReportError([
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'start = a start',
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'a = ""'
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].join('\n'));
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expect(pass).not.toReportError([
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'start = a start',
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'a = "a"'
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].join('\n'));
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expect(pass).toReportError('start = "" start');
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expect(pass).not.toReportError('start = "a" start');
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expect(pass).not.toReportError('start = [a-d] start');
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expect(pass).not.toReportError('start = . start');
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});
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});
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});
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