// Copyright 2010 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.
package regexp
import (
"fmt"
"strings"
"testing"
)
// For each pattern/text pair, what is the expected output of each function?
// We can derive the textual results from the indexed results, the non-submatch
// results from the submatched results, the single results from the 'all' results,
// and the byte results from the string results. Therefore the table includes
// only the FindAllStringSubmatchIndex result.
type FindTest struct {
pat string
text string
matches [][]int
}
func (t FindTest) String() string {
return fmt.Sprintf("pat: %#q text: %#q", t.pat, t.text)
}
var findTests = []FindTest{
{``, ``, build(1, 0, 0)},
{`^abcdefg`, "abcdefg", build(1, 0, 7)},
{`a+`, "baaab", build(1, 1, 4)},
{"abcd..", "abcdef", build(1, 0, 6)},
{`a`, "a", build(1, 0, 1)},
{`x`, "y", nil},
{`b`, "abc", build(1, 1, 2)},
{`.`, "a", build(1, 0, 1)},
{`.*`, "abcdef", build(1, 0, 6)},
{`^`, "abcde", build(1, 0, 0)},
{`$`, "abcde", build(1, 5, 5)},
{`^abcd$`, "abcd", build(1, 0, 4)},
{`^bcd'`, "abcdef", nil},
{`^abcd$`, "abcde", nil},
{`a+`, "baaab", build(1, 1, 4)},
{`a*`, "baaab", build(3, 0, 0, 1, 4, 5, 5)},
{`[a-z]+`, "abcd", build(1, 0, 4)},
{`[^a-z]+`, "ab1234cd", build(1, 2, 6)},
{`[a\-\]z]+`, "az]-bcz", build(2, 0, 4, 6, 7)},
{`[^\n]+`, "abcd\n", build(1, 0, 4)},
{`[日本語]+`, "日本語日本語", build(1, 0, 18)},
{`日本語+`, "日本語", build(1, 0, 9)},
{`日本語+`, "日本語語語語", build(1, 0, 18)},
{`()`, "", build(1, 0, 0, 0, 0)},
{`(a)`, "a", build(1, 0, 1, 0, 1)},
{`(.)(.)`, "日a", build(1, 0, 4, 0, 3, 3, 4)},
{`(.*)`, "", build(1, 0, 0, 0, 0)},
{`(.*)`, "abcd", build(1, 0, 4, 0, 4)},
{`(..)(..)`, "abcd", build(1, 0, 4, 0, 2, 2, 4)},
{`(([^xyz]*)(d))`, "abcd", build(1, 0, 4, 0, 4, 0, 3, 3, 4)},
{`((a|b|c)*(d))`, "abcd", build(1, 0, 4, 0, 4, 2, 3, 3, 4)},
{`(((a|b|c)*)(d))`, "abcd", build(1, 0, 4, 0, 4, 0, 3, 2, 3, 3, 4)},
{`\a\f\n\r\t\v`, "\a\f\n\r\t\v", build(1, 0, 6)},
{`[\a\f\n\r\t\v]+`, "\a\f\n\r\t\v", build(1, 0, 6)},
{`a*(|(b))c*`, "aacc", build(1, 0, 4, 2, 2, -1, -1)},
{`(.*).*`, "ab", build(1, 0, 2, 0, 2)},
{`[.]`, ".", build(1, 0, 1)},
{`/$`, "/abc/", build(1, 4, 5)},
{`/$`, "/abc", nil},
// multiple matches
{`.`, "abc", build(3, 0, 1, 1, 2, 2, 3)},
{`(.)`, "abc", build(3, 0, 1, 0, 1, 1, 2, 1, 2, 2, 3, 2, 3)},
{`.(.)`, "abcd", build(2, 0, 2, 1, 2, 2, 4, 3, 4)},
{`ab*`, "abbaab", build(3, 0, 3, 3, 4, 4, 6)},
{`a(b*)`, "abbaab", build(3, 0, 3, 1, 3, 3, 4, 4, 4, 4, 6, 5, 6)},
// fixed bugs
{`ab$`, "cab", build(1, 1, 3)},
{`axxb$`, "axxcb", nil},
{`data`, "daXY data", build(1, 5, 9)},
{`da(.)a$`, "daXY data", build(1, 5, 9, 7, 8)},
{`zx+`, "zzx", build(1, 1, 3)},
{`ab$`, "abcab", build(1, 3, 5)},
{`(aa)*$`, "a", build(1, 1, 1, -1, -1)},
{`(?:.|(?:.a))`, "", nil},
{`(?:A(?:A|a))`, "Aa", build(1, 0, 2)},
{`(?:A|(?:A|a))`, "a", build(1, 0, 1)},
{`(a){0}`, "", build(1, 0, 0, -1, -1)},
{`(?-s)(?:(?:^).)`, "\n", nil},
{`(?s)(?:(?:^).)`, "\n", build(1, 0, 1)},
{`(?:(?:^).)`, "\n", nil},
{`\b`, "x", build(2, 0, 0, 1, 1)},
{`\b`, "xx", build(2, 0, 0, 2, 2)},
{`\b`, "x y", build(4, 0, 0, 1, 1, 2, 2, 3, 3)},
{`\b`, "xx yy", build(4, 0, 0, 2, 2, 3, 3, 5, 5)},
{`\B`, "x", nil},
{`\B`, "xx", build(1, 1, 1)},
{`\B`, "x y", nil},
{`\B`, "xx yy", build(2, 1, 1, 4, 4)},
// RE2 tests
{`[^\S\s]`, "abcd", nil},
{`[^\S[:space:]]`, "abcd", nil},
{`[^\D\d]`, "abcd", nil},
{`[^\D[:digit:]]`, "abcd", nil},
{`(?i)\W`, "x", nil},
{`(?i)\W`, "k", nil},
{`(?i)\W`, "s", nil},
// can backslash-escape any punctuation
{`\!\"\#\$\%\&\'\(\)\*\+\,\-\.\/\:\;\<\=\>\?\@\[\\\]\^\_\{\|\}\~`,
`!"#$%&'()*+,-./:;<=>?@[\]^_{|}~`, build(1, 0, 31)},
{`[\!\"\#\$\%\&\'\(\)\*\+\,\-\.\/\:\;\<\=\>\?\@\[\\\]\^\_\{\|\}\~]+`,
`!"#$%&'()*+,-./:;<=>?@[\]^_{|}~`, build(1, 0, 31)},
{"\\`", "`", build(1, 0, 1)},
{"[\\`]+", "`", build(1, 0, 1)},
// long set of matches (longer than startSize)
{
".",
"qwertyuiopasdfghjklzxcvbnm1234567890",
build(36, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10,
10, 11, 11, 12, 12, 13, 13, 14, 14, 15, 15, 16, 16, 17, 17, 18, 18, 19, 19, 20,
20, 21, 21, 22, 22, 23, 23, 24, 24, 25, 25, 26, 26, 27, 27, 28, 28, 29, 29, 30,
30, 31, 31, 32, 32, 33, 33, 34, 34, 35, 35, 36),
},
}
// build is a helper to construct a [][]int by extracting n sequences from x.
// This represents n matches with len(x)/n submatches each.
func build(n int, x ...int) [][]int {
ret := make([][]int, n)
runLength := len(x) / n
j := 0
for i := range ret {
ret[i] = make([]int, runLength)
copy(ret[i], x[j:])
j += runLength
if j > len(x) {
panic("invalid build entry")
}
}
return ret
}
// First the simple cases.
func TestFind(t *testing.T) {
for _, test := range findTests {
re := MustCompile(test.pat)
if re.String() != test.pat {
t.Errorf("String() = `%s`; should be `%s`", re.String(), test.pat)
}
result := re.Find([]byte(test.text))
switch {
case len(test.matches) == 0 && len(result) == 0:
// ok
case test.matches == nil && result != nil:
t.Errorf("expected no match; got one: %s", test)
case test.matches != nil && result == nil:
t.Errorf("expected match; got none: %s", test)
case test.matches != nil && result != nil:
expect := test.text[test.matches[0][0]:test.matches[0][1]]
if len(result) != cap(result) {
t.Errorf("expected capacity %d got %d: %s", len(result), cap(result), test)
}
if expect != string(result) {
t.Errorf("expected %q got %q: %s", expect, result, test)
}
}
}
}
func TestFindString(t *testing.T) {
for _, test := range findTests {
result := MustCompile(test.pat).FindString(test.text)
switch {
case len(test.matches) == 0 && len(result) == 0:
// ok
case test.matches == nil && result != "":
t.Errorf("expected no match; got one: %s", test)
case test.matches != nil && result == "":
// Tricky because an empty result has two meanings: no match or empty match.
if test.matches[0][0] != test.matches[0][1] {
t.Errorf("expected match; got none: %s", test)
}
case test.matches != nil && result != "":
expect := test.text[test.matches[0][0]:test.matches[0][1]]
if expect != result {
t.Errorf("expected %q got %q: %s", expect, result, test)
}
}
}
}
func testFindIndex(test *FindTest, result []int, t *testing.T) {
switch {
case len(test.matches) == 0 && len(result) == 0:
// ok
case test.matches == nil && result != nil:
t.Errorf("expected no match; got one: %s", test)
case test.matches != nil && result == nil:
t.Errorf("expected match; got none: %s", test)
case test.matches != nil && result != nil:
expect := test.matches[0]
if expect[0] != result[0] || expect[1] != result[1] {
t.Errorf("expected %v got %v: %s", expect, result, test)
}
}
}
func TestFindIndex(t *testing.T) {
for _, test := range findTests {
testFindIndex(&test, MustCompile(test.pat).FindIndex([]byte(test.text)), t)
}
}
func TestFindStringIndex(t *testing.T) {
for _, test := range findTests {
testFindIndex(&test, MustCompile(test.pat).FindStringIndex(test.text), t)
}
}
func TestFindReaderIndex(t *testing.T) {
for _, test := range findTests {
testFindIndex(&test, MustCompile(test.pat).FindReaderIndex(strings.NewReader(test.text)), t)
}
}
// Now come the simple All cases.
func TestFindAll(t *testing.T) {
for _, test := range findTests {
result := MustCompile(test.pat).FindAll([]byte(test.text), -1)
switch {
case test.matches == nil && result == nil:
// ok
case test.matches == nil && result != nil:
t.Errorf("expected no match; got one: %s", test)
case test.matches != nil && result == nil:
t.Fatalf("expected match; got none: %s", test)
case test.matches != nil && result != nil:
if len(test.matches) != len(result) {
t.Errorf("expected %d matches; got %d: %s", len(test.matches), len(result), test)
continue
}
for k, e := range test.matches {
got := result[k]
if len(got) != cap(got) {
t.Errorf("match %d: expected capacity %d got %d: %s", k, len(got), cap(got), test)
}
expect := test.text[e[0]:e[1]]
if expect != string(got) {
t.Errorf("match %d: expected %q got %q: %s", k, expect, got, test)
}
}
}
}
}
func TestFindAllString(t *testing.T) {
for _, test := range findTests {
result := MustCompile(test.pat).FindAllString(test.text, -1)
switch {
case test.matches == nil && result == nil:
// ok
case test.matches == nil && result != nil:
t.Errorf("expected no match; got one: %s", test)
case test.matches != nil && result == nil:
t.Errorf("expected match; got none: %s", test)
case test.matches != nil && result != nil:
if len(test.matches) != len(result) {
t.Errorf("expected %d matches; got %d: %s", len(test.matches), len(result), test)
continue
}
for k, e := range test.matches {
expect := test.text[e[0]:e[1]]
if expect != result[k] {
t.Errorf("expected %q got %q: %s", expect, result, test)
}
}
}
}
}
func testFindAllIndex(test *FindTest, result [][]int, t *testing.T) {
switch {
case test.matches == nil && result == nil:
// ok
case test.matches == nil && result != nil:
t.Errorf("expected no match; got one: %s", test)
case test.matches != nil && result == nil:
t.Errorf("expected match; got none: %s", test)
case test.matches != nil && result != nil:
if len(test.matches) != len(result) {
t.Errorf("expected %d matches; got %d: %s", len(test.matches), len(result), test)
return
}
for k, e := range test.matches {
if e[0] != result[k][0] || e[1] != result[k][1] {
t.Errorf("match %d: expected %v got %v: %s", k, e, result[k], test)
}
}
}
}
func TestFindAllIndex(t *testing.T) {
for _, test := range findTests {
testFindAllIndex(&test, MustCompile(test.pat).FindAllIndex([]byte(test.text), -1), t)
}
}
func TestFindAllStringIndex(t *testing.T) {
for _, test := range findTests {
testFindAllIndex(&test, MustCompile(test.pat).FindAllStringIndex(test.text, -1), t)
}
}
// Now come the Submatch cases.
func testSubmatchBytes(test *FindTest, n int, submatches []int, result [][]byte, t *testing.T) {
if len(submatches) != len(result)*2 {
t.Errorf("match %d: expected %d submatches; got %d: %s", n, len(submatches)/2, len(result), test)
return
}
for k := 0; k < len(submatches); k += 2 {
if submatches[k] == -1 {
if result[k/2] != nil {
t.Errorf("match %d: expected nil got %q: %s", n, result, test)
}
continue
}
got := result[k/2]
if len(got) != cap(got) {
t.Errorf("match %d: expected capacity %d got %d: %s", n, len(got), cap(got), test)
return
}
expect := test.text[submatches[k]:submatches[k+1]]
if expect != string(got) {
t.Errorf("match %d: expected %q got %q: %s", n, expect, got, test)
return
}
}
}
func TestFindSubmatch(t *testing.T) {
for _, test := range findTests {
result := MustCompile(test.pat).FindSubmatch([]byte(test.text))
switch {
case test.matches == nil && result == nil:
// ok
case test.matches == nil && result != nil:
t.Errorf("expected no match; got one: %s", test)
case test.matches != nil && result == nil:
t.Errorf("expected match; got none: %s", test)
case test.matches != nil && result != nil:
testSubmatchBytes(&test, 0, test.matches[0], result, t)
}
}
}
func testSubmatchString(test *FindTest, n int, submatches []int, result []string, t *testing.T) {
if len(submatches) != len(result)*2 {
t.Errorf("match %d: expected %d submatches; got %d: %s", n, len(submatches)/2, len(result), test)
return
}
for k := 0; k < len(submatches); k += 2 {
if submatches[k] == -1 {
if result[k/2] != "" {
t.Errorf("match %d: expected nil got %q: %s", n, result, test)
}
continue
}
expect := test.text[submatches[k]:submatches[k+1]]
if expect != result[k/2] {
t.Errorf("match %d: expected %q got %q: %s", n, expect, result, test)
return
}
}
}
func TestFindStringSubmatch(t *testing.T) {
for _, test := range findTests {
result := MustCompile(test.pat).FindStringSubmatch(test.text)
switch {
case test.matches == nil && result == nil:
// ok
case test.matches == nil && result != nil:
t.Errorf("expected no match; got one: %s", test)
case test.matches != nil && result == nil:
t.Errorf("expected match; got none: %s", test)
case test.matches != nil && result != nil:
testSubmatchString(&test, 0, test.matches[0], result, t)
}
}
}
func testSubmatchIndices(test *FindTest, n int, expect, result []int, t *testing.T) {
if len(expect) != len(result) {
t.Errorf("match %d: expected %d matches; got %d: %s", n, len(expect)/2, len(result)/2, test)
return
}
for k, e := range expect {
if e != result[k] {
t.Errorf("match %d: submatch error: expected %v got %v: %s", n, expect, result, test)
}
}
}
func testFindSubmatchIndex(test *FindTest, result []int, t *testing.T) {
switch {
case test.matches == nil && result == nil:
// ok
case test.matches == nil && result != nil:
t.Errorf("expected no match; got one: %s", test)
case test.matches != nil && result == nil:
t.Errorf("expected match; got none: %s", test)
case test.matches != nil && result != nil:
testSubmatchIndices(test, 0, test.matches[0], result, t)
}
}
func TestFindSubmatchIndex(t *testing.T) {
for _, test := range findTests {
testFindSubmatchIndex(&test, MustCompile(test.pat).FindSubmatchIndex([]byte(test.text)), t)
}
}
func TestFindStringSubmatchIndex(t *testing.T) {
for _, test := range findTests {
testFindSubmatchIndex(&test, MustCompile(test.pat).FindStringSubmatchIndex(test.text), t)
}
}
func TestFindReaderSubmatchIndex(t *testing.T) {
for _, test := range findTests {
testFindSubmatchIndex(&test, MustCompile(test.pat).FindReaderSubmatchIndex(strings.NewReader(test.text)), t)
}
}
// Now come the monster AllSubmatch cases.
func TestFindAllSubmatch(t *testing.T) {
for _, test := range findTests {
result := MustCompile(test.pat).FindAllSubmatch([]byte(test.text), -1)
switch {
case test.matches == nil && result == nil:
// ok
case test.matches == nil && result != nil:
t.Errorf("expected no match; got one: %s", test)
case test.matches != nil && result == nil:
t.Errorf("expected match; got none: %s", test)
case len(test.matches) != len(result):
t.Errorf("expected %d matches; got %d: %s", len(test.matches), len(result), test)
case test.matches != nil && result != nil:
for k, match := range test.matches {
testSubmatchBytes(&test, k, match, result[k], t)
}
}
}
}
func TestFindAllStringSubmatch(t *testing.T) {
for _, test := range findTests {
result := MustCompile(test.pat).FindAllStringSubmatch(test.text, -1)
switch {
case test.matches == nil && result == nil:
// ok
case test.matches == nil && result != nil:
t.Errorf("expected no match; got one: %s", test)
case test.matches != nil && result == nil:
t.Errorf("expected match; got none: %s", test)
case len(test.matches) != len(result):
t.Errorf("expected %d matches; got %d: %s", len(test.matches), len(result), test)
case test.matches != nil && result != nil:
for k, match := range test.matches {
testSubmatchString(&test, k, match, result[k], t)
}
}
}
}
func testFindAllSubmatchIndex(test *FindTest, result [][]int, t *testing.T) {
switch {
case test.matches == nil && result == nil:
// ok
case test.matches == nil && result != nil:
t.Errorf("expected no match; got one: %s", test)
case test.matches != nil && result == nil:
t.Errorf("expected match; got none: %s", test)
case len(test.matches) != len(result):
t.Errorf("expected %d matches; got %d: %s", len(test.matches), len(result), test)
case test.matches != nil && result != nil:
for k, match := range test.matches {
testSubmatchIndices(test, k, match, result[k], t)
}
}
}
func TestFindAllSubmatchIndex(t *testing.T) {
for _, test := range findTests {
testFindAllSubmatchIndex(&test, MustCompile(test.pat).FindAllSubmatchIndex([]byte(test.text), -1), t)
}
}
func TestFindAllStringSubmatchIndex(t *testing.T) {
for _, test := range findTests {
testFindAllSubmatchIndex(&test, MustCompile(test.pat).FindAllStringSubmatchIndex(test.text, -1), t)
}
}
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