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SimplifyTest.java
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SimplifyTest.java
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/*
* Copyright (c) 2020 The Go Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style
* license that can be found in the LICENSE file.
*/
// Original Go source here:
// http://code.google.com/p/go/source/browse/src/pkg/regexp/syntax/simplify_test.go
package com.google.re2j;
import static org.junit.Assert.assertEquals;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
@RunWith(Parameterized.class)
public class SimplifyTest {
private static final String[][] SIMPLIFY_TESTS = {
// Already-simple constructs
{"a", "a"},
{"ab", "ab"},
{"a|b", "[a-b]"},
{"ab|cd", "ab|cd"},
{"(ab)*", "(ab)*"},
{"(ab)+", "(ab)+"},
{"(ab)?", "(ab)?"},
{".", "(?s:.)"},
{"^", "^"},
{"$", "$"},
{"[ac]", "[ac]"},
{"[^ac]", "[^ac]"},
// Posix character classes
{"[[:alnum:]]", "[0-9A-Za-z]"},
{"[[:alpha:]]", "[A-Za-z]"},
{"[[:blank:]]", "[\\t ]"},
{"[[:cntrl:]]", "[\\x00-\\x1f\\x7f]"},
{"[[:digit:]]", "[0-9]"},
{"[[:graph:]]", "[!-~]"},
{"[[:lower:]]", "[a-z]"},
{"[[:print:]]", "[ -~]"},
{"[[:punct:]]", "[!-/:-@\\[-`\\{-~]"},
{"[[:space:]]", "[\\t-\\r ]"},
{"[[:upper:]]", "[A-Z]"},
{"[[:xdigit:]]", "[0-9A-Fa-f]"},
// Perl character classes
{"\\d", "[0-9]"},
{"\\s", "[\\t-\\n\\f-\\r ]"},
{"\\w", "[0-9A-Z_a-z]"},
{"\\D", "[^0-9]"},
{"\\S", "[^\\t-\\n\\f-\\r ]"},
{"\\W", "[^0-9A-Z_a-z]"},
{"[\\d]", "[0-9]"},
{"[\\s]", "[\\t-\\n\\f-\\r ]"},
{"[\\w]", "[0-9A-Z_a-z]"},
{"[\\D]", "[^0-9]"},
{"[\\S]", "[^\\t-\\n\\f-\\r ]"},
{"[\\W]", "[^0-9A-Z_a-z]"},
// Posix repetitions
{"a{1}", "a"},
{"a{2}", "aa"},
{"a{5}", "aaaaa"},
{"a{0,1}", "a?"},
// The next three are illegible because Simplify inserts (?:)
// parens instead of () parens to avoid creating extra
// captured subexpressions. The comments show a version with fewer parens.
{"(a){0,2}", "(?:(a)(a)?)?"}, // (aa?)?
{"(a){0,4}", "(?:(a)(?:(a)(?:(a)(a)?)?)?)?"}, // (a(a(aa?)?)?)?
{"(a){2,6}", "(a)(a)(?:(a)(?:(a)(?:(a)(a)?)?)?)?"}, // aa(a(a(aa?)?)?)?
{"a{0,2}", "(?:aa?)?"}, // (aa?)?
{"a{0,4}", "(?:a(?:a(?:aa?)?)?)?"}, // (a(a(aa?)?)?)?
{"a{2,6}", "aa(?:a(?:a(?:aa?)?)?)?"}, // aa(a(a(aa?)?)?)?
{"a{0,}", "a*"},
{"a{1,}", "a+"},
{"a{2,}", "aa+"},
{"a{5,}", "aaaaa+"},
// Test that operators simplify their arguments.
{"(?:a{1,}){1,}", "a+"},
{"(a{1,}b{1,})", "(a+b+)"},
{"a{1,}|b{1,}", "a+|b+"},
{"(?:a{1,})*", "(?:a+)*"},
{"(?:a{1,})+", "a+"},
{"(?:a{1,})?", "(?:a+)?"},
{"", "(?:)"},
{"a{0}", "(?:)"},
// Character class simplification
{"[ab]", "[a-b]"},
{"[a-za-za-z]", "[a-z]"},
{"[A-Za-zA-Za-z]", "[A-Za-z]"},
{"[ABCDEFGH]", "[A-H]"},
{"[AB-CD-EF-GH]", "[A-H]"},
{"[W-ZP-XE-R]", "[E-Z]"},
{"[a-ee-gg-m]", "[a-m]"},
{"[a-ea-ha-m]", "[a-m]"},
{"[a-ma-ha-e]", "[a-m]"},
{"[a-zA-Z0-9 -~]", "[ -~]"},
// Empty character classes
{"[^[:cntrl:][:^cntrl:]]", "[^\\x00-\\x{10FFFF}]"},
// Full character classes
{"[[:cntrl:][:^cntrl:]]", "(?s:.)"},
// Unicode case folding.
{"(?i)A", "(?i:A)"},
{"(?i)a", "(?i:A)"},
{"(?i)[A]", "(?i:A)"},
{"(?i)[a]", "(?i:A)"},
{"(?i)K", "(?i:K)"},
{"(?i)k", "(?i:K)"},
{"(?i)\\x{212a}", "(?i:K)"},
{"(?i)[K]", "[Kk\u212A]"},
{"(?i)[k]", "[Kk\u212A]"},
{"(?i)[\\x{212a}]", "[Kk\u212A]"},
{"(?i)[a-z]", "[A-Za-z\u017F\u212A]"},
{"(?i)[\\x00-\\x{FFFD}]", "[\\x00-\uFFFD]"},
{"(?i)[\\x00-\\x{10FFFF}]", "(?s:.)"},
// Empty string as a regular expression.
// The empty string must be preserved inside parens in order
// to make submatches work right, so these tests are less
// interesting than they might otherwise be. String inserts
// explicit (?:) in place of non-parenthesized empty strings,
// to make them easier to spot for other parsers.
{"(a|b|)", "([a-b]|(?:))"},
{"(|)", "()"},
{"a()", "a()"},
{"(()|())", "(()|())"},
{"(a|)", "(a|(?:))"},
{"ab()cd()", "ab()cd()"},
{"()", "()"},
{"()*", "()*"},
{"()+", "()+"},
{"()?", "()?"},
{"(){0}", "(?:)"},
{"(){1}", "()"},
{"(){1,}", "()+"},
{"(){0,2}", "(?:()()?)?"},
{"(?:(a){0})", "(?:)"},
};
@Parameterized.Parameters
public static Object[] getParameters() {
return SIMPLIFY_TESTS;
}
private final String input;
private final String expected;
public SimplifyTest(String input, String expected) {
this.input = input;
this.expected = expected;
}
@Test
public void testSimplify() throws PatternSyntaxException {
Regexp re = Parser.parse(input, RE2.MATCH_NL | (RE2.PERL & ~RE2.ONE_LINE));
String s = Simplify.simplify(re).toString();
assertEquals(String.format("simplify(%s)", input), expected, s);
}
}