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1 747 jeremybenn 
// Copyright 2010 The Go Authors. All rights reserved.
2 
// Use of this source code is governed by a BSD-style
3 
// license that can be found in the LICENSE file.
4 
 
5 
package regexp
6 
 
7 
import (
8 
        "fmt"
9 
        "strings"
10 
        "testing"
11 
)
12 
 
13 
// For each pattern/text pair, what is the expected output of each function?
14 
// We can derive the textual results from the indexed results, the non-submatch
15 
// results from the submatched results, the single results from the 'all' results,
16 
// and the byte results from the string results. Therefore the table includes
17 
// only the FindAllStringSubmatchIndex result.
18 
type FindTest struct {
19 
        pat     string
20 
        text    string
21 
        matches [][]int
22 
}
23 
 
24 
func (t FindTest) String() string {
25 
        return fmt.Sprintf("pat: %#q text: %#q", t.pat, t.text)
26 
}
27 
 
28 
var findTests = []FindTest{
29 
        {``, ``, build(1, 0, 0)},
30 
        {`^abcdefg`, "abcdefg", build(1, 0, 7)},
31 
        {`a+`, "baaab", build(1, 1, 4)},
32 
        {"abcd..", "abcdef", build(1, 0, 6)},
33 
        {`a`, "a", build(1, 0, 1)},
34 
        {`x`, "y", nil},
35 
        {`b`, "abc", build(1, 1, 2)},
36 
        {`.`, "a", build(1, 0, 1)},
37 
        {`.*`, "abcdef", build(1, 0, 6)},
38 
        {`^`, "abcde", build(1, 0, 0)},
39 
        {`$`, "abcde", build(1, 5, 5)},
40 
        {`^abcd$`, "abcd", build(1, 0, 4)},
41 
        {`^bcd'`, "abcdef", nil},
42 
        {`^abcd$`, "abcde", nil},
43 
        {`a+`, "baaab", build(1, 1, 4)},
44 
        {`a*`, "baaab", build(3, 0, 0, 1, 4, 5, 5)},
45 
        {`[a-z]+`, "abcd", build(1, 0, 4)},
46 
        {`[^a-z]+`, "ab1234cd", build(1, 2, 6)},
47 
        {`[a\-\]z]+`, "az]-bcz", build(2, 0, 4, 6, 7)},
48 
        {`[^\n]+`, "abcd\n", build(1, 0, 4)},
49 
        {`[日本語]+`, "日本語日本語", build(1, 0, 18)},
50 
        {`日本語+`, "日本語", build(1, 0, 9)},
51 
        {`日本語+`, "日本語語語語", build(1, 0, 18)},
52 
        {`()`, "", build(1, 0, 0, 0, 0)},
53 
        {`(a)`, "a", build(1, 0, 1, 0, 1)},
54 
        {`(.)(.)`, "æ—¥a", build(1, 0, 4, 0, 3, 3, 4)},
55 
        {`(.*)`, "", build(1, 0, 0, 0, 0)},
56 
        {`(.*)`, "abcd", build(1, 0, 4, 0, 4)},
57 
        {`(..)(..)`, "abcd", build(1, 0, 4, 0, 2, 2, 4)},
58 
        {`(([^xyz]*)(d))`, "abcd", build(1, 0, 4, 0, 4, 0, 3, 3, 4)},
59 
        {`((a|b|c)*(d))`, "abcd", build(1, 0, 4, 0, 4, 2, 3, 3, 4)},
60 
        {`(((a|b|c)*)(d))`, "abcd", build(1, 0, 4, 0, 4, 0, 3, 2, 3, 3, 4)},
61 
        {`\a\b\f\n\r\t\v`, "\a\b\f\n\r\t\v", build(1, 0, 7)},
62 
        {`[\a\b\f\n\r\t\v]+`, "\a\b\f\n\r\t\v", build(1, 0, 7)},
63 
 
64 
        {`a*(|(b))c*`, "aacc", build(1, 0, 4, 2, 2, -1, -1)},
65 
        {`(.*).*`, "ab", build(1, 0, 2, 0, 2)},
66 
        {`[.]`, ".", build(1, 0, 1)},
67 
        {`/$`, "/abc/", build(1, 4, 5)},
68 
        {`/$`, "/abc", nil},
69 
 
70 
        // multiple matches
71 
        {`.`, "abc", build(3, 0, 1, 1, 2, 2, 3)},
72 
        {`(.)`, "abc", build(3, 0, 1, 0, 1, 1, 2, 1, 2, 2, 3, 2, 3)},
73 
        {`.(.)`, "abcd", build(2, 0, 2, 1, 2, 2, 4, 3, 4)},
74 
        {`ab*`, "abbaab", build(3, 0, 3, 3, 4, 4, 6)},
75 
        {`a(b*)`, "abbaab", build(3, 0, 3, 1, 3, 3, 4, 4, 4, 4, 6, 5, 6)},
76 
 
77 
        // fixed bugs
78 
        {`ab$`, "cab", build(1, 1, 3)},
79 
        {`axxb$`, "axxcb", nil},
80 
        {`data`, "daXY data", build(1, 5, 9)},
81 
        {`da(.)a$`, "daXY data", build(1, 5, 9, 7, 8)},
82 
        {`zx+`, "zzx", build(1, 1, 3)},
83 
 
84 
        // can backslash-escape any punctuation
85 
        {`\!\"\#\$\%\&\'\(\)\*\+\,\-\.\/\:\;\<\=\>\?\@\[\\\]\^\_\{\|\}\~`,
86 
                `!"#$%&'()*+,-./:;<=>?@[\]^_{|}~`, build(1, 0, 31)},
87 
        {`[\!\"\#\$\%\&\'\(\)\*\+\,\-\.\/\:\;\<\=\>\?\@\[\\\]\^\_\{\|\}\~]+`,
88 
                `!"#$%&'()*+,-./:;<=>?@[\]^_{|}~`, build(1, 0, 31)},
89 
        {"\\`", "`", build(1, 0, 1)},
90 
        {"[\\`]+", "`", build(1, 0, 1)},
91 
 
92 
        // long set of matches (longer than startSize)
93 
        {
94 
                ".",
95 
                "qwertyuiopasdfghjklzxcvbnm1234567890",
96 
                build(36, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10,
97 
                        10, 11, 11, 12, 12, 13, 13, 14, 14, 15, 15, 16, 16, 17, 17, 18, 18, 19, 19, 20,
98 
                        20, 21, 21, 22, 22, 23, 23, 24, 24, 25, 25, 26, 26, 27, 27, 28, 28, 29, 29, 30,
99 
                        30, 31, 31, 32, 32, 33, 33, 34, 34, 35, 35, 36),
100 
        },
101 
}
102 
 
103 
// build is a helper to construct a [][]int by extracting n sequences from x.
104 
// This represents n matches with len(x)/n submatches each.
105 
func build(n int, x ...int) [][]int {
106 
        ret := make([][]int, n)
107 
        runLength := len(x) / n
108 
        j := 0
109 
        for i := range ret {
110 
                ret[i] = make([]int, runLength)
111 
                copy(ret[i], x[j:])
112 
                j += runLength
113 
                if j > len(x) {
114 
                        panic("invalid build entry")
115 
                }
116 
        }
117 
        return ret
118 
}
119 
 
120 
// First the simple cases.
121 
 
122 
func TestFind(t *testing.T) {
123 
        for _, test := range findTests {
124 
                re := MustCompile(test.pat)
125 
                if re.String() != test.pat {
126 
                        t.Errorf("String() = `%s`; should be `%s`", re.String(), test.pat)
127 
                }
128 
                result := re.Find([]byte(test.text))
129 
                switch {
130 
                case len(test.matches) == 0 && len(result) == 0:
131 
                        // ok
132 
                case test.matches == nil && result != nil:
133 
                        t.Errorf("expected no match; got one: %s", test)
134 
                case test.matches != nil && result == nil:
135 
                        t.Errorf("expected match; got none: %s", test)
136 
                case test.matches != nil && result != nil:
137 
                        expect := test.text[test.matches[0][0]:test.matches[0][1]]
138 
                        if expect != string(result) {
139 
                                t.Errorf("expected %q got %q: %s", expect, result, test)
140 
                        }
141 
                }
142 
        }
143 
}
144 
 
145 
func TestFindString(t *testing.T) {
146 
        for _, test := range findTests {
147 
                result := MustCompile(test.pat).FindString(test.text)
148 
                switch {
149 
                case len(test.matches) == 0 && len(result) == 0:
150 
                        // ok
151 
                case test.matches == nil && result != "":
152 
                        t.Errorf("expected no match; got one: %s", test)
153 
                case test.matches != nil && result == "":
154 
                        // Tricky because an empty result has two meanings: no match or empty match.
155 
                        if test.matches[0][0] != test.matches[0][1] {
156 
                                t.Errorf("expected match; got none: %s", test)
157 
                        }
158 
                case test.matches != nil && result != "":
159 
                        expect := test.text[test.matches[0][0]:test.matches[0][1]]
160 
                        if expect != result {
161 
                                t.Errorf("expected %q got %q: %s", expect, result, test)
162 
                        }
163 
                }
164 
        }
165 
}
166 
 
167 
func testFindIndex(test *FindTest, result []int, t *testing.T) {
168 
        switch {
169 
        case len(test.matches) == 0 && len(result) == 0:
170 
                // ok
171 
        case test.matches == nil && result != nil:
172 
                t.Errorf("expected no match; got one: %s", test)
173 
        case test.matches != nil && result == nil:
174 
                t.Errorf("expected match; got none: %s", test)
175 
        case test.matches != nil && result != nil:
176 
                expect := test.matches[0]
177 
                if expect[0] != result[0] || expect[1] != result[1] {
178 
                        t.Errorf("expected %v got %v: %s", expect, result, test)
179 
                }
180 
        }
181 
}
182 
 
183 
func TestFindIndex(t *testing.T) {
184 
        for _, test := range findTests {
185 
                testFindIndex(&test, MustCompile(test.pat).FindIndex([]byte(test.text)), t)
186 
        }
187 
}
188 
 
189 
func TestFindStringIndex(t *testing.T) {
190 
        for _, test := range findTests {
191 
                testFindIndex(&test, MustCompile(test.pat).FindStringIndex(test.text), t)
192 
        }
193 
}
194 
 
195 
func TestFindReaderIndex(t *testing.T) {
196 
        for _, test := range findTests {
197 
                testFindIndex(&test, MustCompile(test.pat).FindReaderIndex(strings.NewReader(test.text)), t)
198 
        }
199 
}
200 
 
201 
// Now come the simple All cases.
202 
 
203 
func TestFindAll(t *testing.T) {
204 
        for _, test := range findTests {
205 
                result := MustCompile(test.pat).FindAll([]byte(test.text), -1)
206 
                switch {
207 
                case test.matches == nil && result == nil:
208 
                        // ok
209 
                case test.matches == nil && result != nil:
210 
                        t.Errorf("expected no match; got one: %s", test)
211 
                case test.matches != nil && result == nil:
212 
                        t.Errorf("expected match; got none: %s", test)
213 
                case test.matches != nil && result != nil:
214 
                        if len(test.matches) != len(result) {
215 
                                t.Errorf("expected %d matches; got %d: %s", len(test.matches), len(result), test)
216 
                                continue
217 
                        }
218 
                        for k, e := range test.matches {
219 
                                expect := test.text[e[0]:e[1]]
220 
                                if expect != string(result[k]) {
221 
                                        t.Errorf("match %d: expected %q got %q: %s", k, expect, result[k], test)
222 
                                }
223 
                        }
224 
                }
225 
        }
226 
}
227 
 
228 
func TestFindAllString(t *testing.T) {
229 
        for _, test := range findTests {
230 
                result := MustCompile(test.pat).FindAllString(test.text, -1)
231 
                switch {
232 
                case test.matches == nil && result == nil:
233 
                        // ok
234 
                case test.matches == nil && result != nil:
235 
                        t.Errorf("expected no match; got one: %s", test)
236 
                case test.matches != nil && result == nil:
237 
                        t.Errorf("expected match; got none: %s", test)
238 
                case test.matches != nil && result != nil:
239 
                        if len(test.matches) != len(result) {
240 
                                t.Errorf("expected %d matches; got %d: %s", len(test.matches), len(result), test)
241 
                                continue
242 
                        }
243 
                        for k, e := range test.matches {
244 
                                expect := test.text[e[0]:e[1]]
245 
                                if expect != result[k] {
246 
                                        t.Errorf("expected %q got %q: %s", expect, result, test)
247 
                                }
248 
                        }
249 
                }
250 
        }
251 
}
252 
 
253 
func testFindAllIndex(test *FindTest, result [][]int, t *testing.T) {
254 
        switch {
255 
        case test.matches == nil && result == nil:
256 
                // ok
257 
        case test.matches == nil && result != nil:
258 
                t.Errorf("expected no match; got one: %s", test)
259 
        case test.matches != nil && result == nil:
260 
                t.Errorf("expected match; got none: %s", test)
261 
        case test.matches != nil && result != nil:
262 
                if len(test.matches) != len(result) {
263 
                        t.Errorf("expected %d matches; got %d: %s", len(test.matches), len(result), test)
264 
                        return
265 
                }
266 
                for k, e := range test.matches {
267 
                        if e[0] != result[k][0] || e[1] != result[k][1] {
268 
                                t.Errorf("match %d: expected %v got %v: %s", k, e, result[k], test)
269 
                        }
270 
                }
271 
        }
272 
}
273 
 
274 
func TestFindAllIndex(t *testing.T) {
275 
        for _, test := range findTests {
276 
                testFindAllIndex(&test, MustCompile(test.pat).FindAllIndex([]byte(test.text), -1), t)
277 
        }
278 
}
279 
 
280 
func TestFindAllStringIndex(t *testing.T) {
281 
        for _, test := range findTests {
282 
                testFindAllIndex(&test, MustCompile(test.pat).FindAllStringIndex(test.text, -1), t)
283 
        }
284 
}
285 
 
286 
// Now come the Submatch cases.
287 
 
288 
func testSubmatchBytes(test *FindTest, n int, submatches []int, result [][]byte, t *testing.T) {
289 
        if len(submatches) != len(result)*2 {
290 
                t.Errorf("match %d: expected %d submatches; got %d: %s", n, len(submatches)/2, len(result), test)
291 
                return
292 
        }
293 
        for k := 0; k < len(submatches); k += 2 {
294 
                if submatches[k] == -1 {
295 
                        if result[k/2] != nil {
296 
                                t.Errorf("match %d: expected nil got %q: %s", n, result, test)
297 
                        }
298 
                        continue
299 
                }
300 
                expect := test.text[submatches[k]:submatches[k+1]]
301 
                if expect != string(result[k/2]) {
302 
                        t.Errorf("match %d: expected %q got %q: %s", n, expect, result, test)
303 
                        return
304 
                }
305 
        }
306 
}
307 
 
308 
func TestFindSubmatch(t *testing.T) {
309 
        for _, test := range findTests {
310 
                result := MustCompile(test.pat).FindSubmatch([]byte(test.text))
311 
                switch {
312 
                case test.matches == nil && result == nil:
313 
                        // ok
314 
                case test.matches == nil && result != nil:
315 
                        t.Errorf("expected no match; got one: %s", test)
316 
                case test.matches != nil && result == nil:
317 
                        t.Errorf("expected match; got none: %s", test)
318 
                case test.matches != nil && result != nil:
319 
                        testSubmatchBytes(&test, 0, test.matches[0], result, t)
320 
                }
321 
        }
322 
}
323 
 
324 
func testSubmatchString(test *FindTest, n int, submatches []int, result []string, t *testing.T) {
325 
        if len(submatches) != len(result)*2 {
326 
                t.Errorf("match %d: expected %d submatches; got %d: %s", n, len(submatches)/2, len(result), test)
327 
                return
328 
        }
329 
        for k := 0; k < len(submatches); k += 2 {
330 
                if submatches[k] == -1 {
331 
                        if result[k/2] != "" {
332 
                                t.Errorf("match %d: expected nil got %q: %s", n, result, test)
333 
                        }
334 
                        continue
335 
                }
336 
                expect := test.text[submatches[k]:submatches[k+1]]
337 
                if expect != result[k/2] {
338 
                        t.Errorf("match %d: expected %q got %q: %s", n, expect, result, test)
339 
                        return
340 
                }
341 
        }
342 
}
343 
 
344 
func TestFindStringSubmatch(t *testing.T) {
345 
        for _, test := range findTests {
346 
                result := MustCompile(test.pat).FindStringSubmatch(test.text)
347 
                switch {
348 
                case test.matches == nil && result == nil:
349 
                        // ok
350 
                case test.matches == nil && result != nil:
351 
                        t.Errorf("expected no match; got one: %s", test)
352 
                case test.matches != nil && result == nil:
353 
                        t.Errorf("expected match; got none: %s", test)
354 
                case test.matches != nil && result != nil:
355 
                        testSubmatchString(&test, 0, test.matches[0], result, t)
356 
                }
357 
        }
358 
}
359 
 
360 
func testSubmatchIndices(test *FindTest, n int, expect, result []int, t *testing.T) {
361 
        if len(expect) != len(result) {
362 
                t.Errorf("match %d: expected %d matches; got %d: %s", n, len(expect)/2, len(result)/2, test)
363 
                return
364 
        }
365 
        for k, e := range expect {
366 
                if e != result[k] {
367 
                        t.Errorf("match %d: submatch error: expected %v got %v: %s", n, expect, result, test)
368 
                }
369 
        }
370 
}
371 
 
372 
func testFindSubmatchIndex(test *FindTest, result []int, t *testing.T) {
373 
        switch {
374 
        case test.matches == nil && result == nil:
375 
                // ok
376 
        case test.matches == nil && result != nil:
377 
                t.Errorf("expected no match; got one: %s", test)
378 
        case test.matches != nil && result == nil:
379 
                t.Errorf("expected match; got none: %s", test)
380 
        case test.matches != nil && result != nil:
381 
                testSubmatchIndices(test, 0, test.matches[0], result, t)
382 
        }
383 
}
384 
 
385 
func TestFindSubmatchIndex(t *testing.T) {
386 
        for _, test := range findTests {
387 
                testFindSubmatchIndex(&test, MustCompile(test.pat).FindSubmatchIndex([]byte(test.text)), t)
388 
        }
389 
}
390 
 
391 
func TestFindStringSubmatchIndex(t *testing.T) {
392 
        for _, test := range findTests {
393 
                testFindSubmatchIndex(&test, MustCompile(test.pat).FindStringSubmatchIndex(test.text), t)
394 
        }
395 
}
396 
 
397 
func TestFindReaderSubmatchIndex(t *testing.T) {
398 
        for _, test := range findTests {
399 
                testFindSubmatchIndex(&test, MustCompile(test.pat).FindReaderSubmatchIndex(strings.NewReader(test.text)), t)
400 
        }
401 
}
402 
 
403 
// Now come the monster AllSubmatch cases.
404 
 
405 
func TestFindAllSubmatch(t *testing.T) {
406 
        for _, test := range findTests {
407 
                result := MustCompile(test.pat).FindAllSubmatch([]byte(test.text), -1)
408 
                switch {
409 
                case test.matches == nil && result == nil:
410 
                        // ok
411 
                case test.matches == nil && result != nil:
412 
                        t.Errorf("expected no match; got one: %s", test)
413 
                case test.matches != nil && result == nil:
414 
                        t.Errorf("expected match; got none: %s", test)
415 
                case len(test.matches) != len(result):
416 
                        t.Errorf("expected %d matches; got %d: %s", len(test.matches), len(result), test)
417 
                case test.matches != nil && result != nil:
418 
                        for k, match := range test.matches {
419 
                                testSubmatchBytes(&test, k, match, result[k], t)
420 
                        }
421 
                }
422 
        }
423 
}
424 
 
425 
func TestFindAllStringSubmatch(t *testing.T) {
426 
        for _, test := range findTests {
427 
                result := MustCompile(test.pat).FindAllStringSubmatch(test.text, -1)
428 
                switch {
429 
                case test.matches == nil && result == nil:
430 
                        // ok
431 
                case test.matches == nil && result != nil:
432 
                        t.Errorf("expected no match; got one: %s", test)
433 
                case test.matches != nil && result == nil:
434 
                        t.Errorf("expected match; got none: %s", test)
435 
                case len(test.matches) != len(result):
436 
                        t.Errorf("expected %d matches; got %d: %s", len(test.matches), len(result), test)
437 
                case test.matches != nil && result != nil:
438 
                        for k, match := range test.matches {
439 
                                testSubmatchString(&test, k, match, result[k], t)
440 
                        }
441 
                }
442 
        }
443 
}
444 
 
445 
func testFindAllSubmatchIndex(test *FindTest, result [][]int, t *testing.T) {
446 
        switch {
447 
        case test.matches == nil && result == nil:
448 
                // ok
449 
        case test.matches == nil && result != nil:
450 
                t.Errorf("expected no match; got one: %s", test)
451 
        case test.matches != nil && result == nil:
452 
                t.Errorf("expected match; got none: %s", test)
453 
        case len(test.matches) != len(result):
454 
                t.Errorf("expected %d matches; got %d: %s", len(test.matches), len(result), test)
455 
        case test.matches != nil && result != nil:
456 
                for k, match := range test.matches {
457 
                        testSubmatchIndices(test, k, match, result[k], t)
458 
                }
459 
        }
460 
}
461 
 
462 
func TestFindAllSubmatchIndex(t *testing.T) {
463 
        for _, test := range findTests {
464 
                testFindAllSubmatchIndex(&test, MustCompile(test.pat).FindAllSubmatchIndex([]byte(test.text), -1), t)
465 
        }
466 
}
467 
 
468 
func TestFindAllStringSubmatchIndex(t *testing.T) {
469 
        for _, test := range findTests {
470 
                testFindAllSubmatchIndex(&test, MustCompile(test.pat).FindAllStringSubmatchIndex(test.text, -1), t)
471 
        }
472 
}

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