50 lines
1.9 KiB
JavaScript
50 lines
1.9 KiB
JavaScript
/**
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* Tests regular expressions and the use of various UCP verbs.
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*/
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(function() {
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"use strict";
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const coll = db.getCollection("regex_backtracking_verbs");
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coll.drop();
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const docA = {_id: 0, text: "a"};
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const docB = {_id: 1, text: "b"};
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[docA, docB].forEach(doc => assert.commandWorked(coll.insert(doc)));
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/**
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* Helper function that asserts that a find command with a filter on the "text" field using
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* 'regex' returns 'expected' when sorting by _id ascending.
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*/
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function assertFindResultsEq(regex, expected) {
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const res = coll.find({text: {$regex: regex}}).sort({_id: 1}).toArray();
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const errfn = `Regex query ${tojson(regex)} returned ${tojson(res)} ` +
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`but expected ${tojson(expected)}`;
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assert.eq(res, expected, errfn);
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}
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const assertMatchesEverything = (regex) => assertFindResultsEq(regex, [docA, docB]);
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const assertMatchesNothing = (regex) => assertFindResultsEq(regex, []);
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// On encountering FAIL, the pattern immediately does not match.
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assertMatchesNothing("(*FAIL)");
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assertMatchesNothing("a(*FAIL)");
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assertMatchesNothing("(*FAIL)b");
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// On encountering ACCEPT, the pattern immediately matches.
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assertMatchesEverything("(*ACCEPT)");
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assertMatchesEverything("(*ACCEPT)a");
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assertMatchesEverything("(*ACCEPT)c");
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assertFindResultsEq("b(*ACCEPT)", [docB]);
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// The following tests simply assert that the backtracking verbs are accepted and do not
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// influence matching.
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["COMMIT", "PRUNE", "PRUNE:FOO", "SKIP", "SKIP:BAR", "THEN", "THEN:BAZ"].forEach(verb => {
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// Verb by itself is the same as an empty regex and matches everything.
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assertMatchesEverything(`(*${verb})`);
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// Verb with pattern does not affect the "matchiness" of the pattern.
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assertFindResultsEq(`(*${verb})a`, [docA]);
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assertFindResultsEq(`(*${verb})[Bb]`, [docB]);
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});
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}());
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