1
2
3
4
5 package syntax
6
7 import (
8 "bytes"
9 "fmt"
10 "os"
11 "strings"
12 "testing"
13 )
14
15
16 func errh(line, col uint, msg string) {
17 panic(fmt.Sprintf("%d:%d: %s", line, col, msg))
18 }
19
20
21 func TestSmoke(t *testing.T) {
22 const src = "if (+foo\t+=..123/***/0.9_0e-0i'a'`raw`\"string\"..f;//$"
23 tokens := []token{_If, _Lparen, _Operator, _Name, _AssignOp, _Dot, _Literal, _Literal, _Literal, _Literal, _Literal, _Dot, _Dot, _Name, _Semi, _EOF}
24
25 var got scanner
26 got.init(strings.NewReader(src), errh, 0)
27 for _, want := range tokens {
28 got.next()
29 if got.tok != want {
30 t.Errorf("%d:%d: got %s; want %s", got.line, got.col, got.tok, want)
31 continue
32 }
33 }
34 }
35
36
37 func TestTokens(t *testing.T) {
38 var got scanner
39 for _, want := range sampleTokens {
40 got.init(strings.NewReader(want.src), func(line, col uint, msg string) {
41 t.Errorf("%s:%d:%d: %s", want.src, line, col, msg)
42 }, 0)
43 got.next()
44 if got.tok != want.tok {
45 t.Errorf("%s: got %s; want %s", want.src, got.tok, want.tok)
46 continue
47 }
48 if (got.tok == _Name || got.tok == _Literal) && got.lit != want.src {
49 t.Errorf("%s: got %q; want %q", want.src, got.lit, want.src)
50 }
51 }
52 }
53
54 func TestScanner(t *testing.T) {
55 if testing.Short() {
56 t.Skip("skipping test in short mode")
57 }
58
59 filename := *src_
60 src, err := os.Open(filename)
61 if err != nil {
62 t.Fatal(err)
63 }
64 defer src.Close()
65
66 var s scanner
67 s.init(src, errh, 0)
68 for {
69 s.next()
70 if s.tok == _EOF {
71 break
72 }
73 if !testing.Verbose() {
74 continue
75 }
76 switch s.tok {
77 case _Name, _Literal:
78 fmt.Printf("%s:%d:%d: %s => %s\n", filename, s.line, s.col, s.tok, s.lit)
79 case _Operator:
80 fmt.Printf("%s:%d:%d: %s => %s (prec = %d)\n", filename, s.line, s.col, s.tok, s.op, s.prec)
81 default:
82 fmt.Printf("%s:%d:%d: %s\n", filename, s.line, s.col, s.tok)
83 }
84 }
85 }
86
87 func TestEmbeddedTokens(t *testing.T) {
88
89 var buf bytes.Buffer
90 for i, s := range sampleTokens {
91 buf.WriteString("\t\t\t\t"[:i&3])
92 buf.WriteString(s.src)
93 buf.WriteString(" "[:i&7])
94 fmt.Fprintf(&buf, "/*line foo:%d */ // bar\n", i)
95 }
96
97
98 var got scanner
99 var src string
100 got.init(&buf, func(line, col uint, msg string) {
101 t.Fatalf("%s:%d:%d: %s", src, line, col, msg)
102 }, 0)
103 got.next()
104 for i, want := range sampleTokens {
105 src = want.src
106 nlsemi := false
107
108 if got.line-linebase != uint(i) {
109 t.Errorf("%s: got line %d; want %d", src, got.line-linebase, i)
110 }
111
112 if got.tok != want.tok {
113 t.Errorf("%s: got tok %s; want %s", src, got.tok, want.tok)
114 continue
115 }
116
117 switch want.tok {
118 case _Semi:
119 if got.lit != "semicolon" {
120 t.Errorf("%s: got %s; want semicolon", src, got.lit)
121 }
122
123 case _Name, _Literal:
124 if got.lit != want.src {
125 t.Errorf("%s: got lit %q; want %q", src, got.lit, want.src)
126 continue
127 }
128 nlsemi = true
129
130 case _Operator, _AssignOp, _IncOp:
131 if got.op != want.op {
132 t.Errorf("%s: got op %s; want %s", src, got.op, want.op)
133 continue
134 }
135 if got.prec != want.prec {
136 t.Errorf("%s: got prec %d; want %d", src, got.prec, want.prec)
137 continue
138 }
139 nlsemi = want.tok == _IncOp
140
141 case _Rparen, _Rbrack, _Rbrace, _Break, _Continue, _Fallthrough, _Return:
142 nlsemi = true
143 }
144
145 if nlsemi {
146 got.next()
147 if got.tok != _Semi {
148 t.Errorf("%s: got tok %s; want ;", src, got.tok)
149 continue
150 }
151 if got.lit != "newline" {
152 t.Errorf("%s: got %s; want newline", src, got.lit)
153 }
154 }
155
156 got.next()
157 }
158
159 if got.tok != _EOF {
160 t.Errorf("got %q; want _EOF", got.tok)
161 }
162 }
163
164 var sampleTokens = [...]struct {
165 tok token
166 src string
167 op Operator
168 prec int
169 }{
170
171 {_Name, "x", 0, 0},
172 {_Name, "X123", 0, 0},
173 {_Name, "foo", 0, 0},
174 {_Name, "Foo123", 0, 0},
175 {_Name, "foo_bar", 0, 0},
176 {_Name, "_", 0, 0},
177 {_Name, "_foobar", 0, 0},
178 {_Name, "a۰۱۸", 0, 0},
179 {_Name, "foo६४", 0, 0},
180 {_Name, "bar９８７６", 0, 0},
181 {_Name, "ŝ", 0, 0},
182 {_Name, "ŝfoo", 0, 0},
183
184
185 {_Literal, "0", 0, 0},
186 {_Literal, "1", 0, 0},
187 {_Literal, "12345", 0, 0},
188 {_Literal, "123456789012345678890123456789012345678890", 0, 0},
189 {_Literal, "01234567", 0, 0},
190 {_Literal, "0_1_234_567", 0, 0},
191 {_Literal, "0X0", 0, 0},
192 {_Literal, "0xcafebabe", 0, 0},
193 {_Literal, "0x_cafe_babe", 0, 0},
194 {_Literal, "0O0", 0, 0},
195 {_Literal, "0o000", 0, 0},
196 {_Literal, "0o_000", 0, 0},
197 {_Literal, "0B1", 0, 0},
198 {_Literal, "0b01100110", 0, 0},
199 {_Literal, "0b_0110_0110", 0, 0},
200 {_Literal, "0.", 0, 0},
201 {_Literal, "0.e0", 0, 0},
202 {_Literal, "0.e-1", 0, 0},
203 {_Literal, "0.e+123", 0, 0},
204 {_Literal, ".0", 0, 0},
205 {_Literal, ".0E00", 0, 0},
206 {_Literal, ".0E-0123", 0, 0},
207 {_Literal, ".0E+12345678901234567890", 0, 0},
208 {_Literal, ".45e1", 0, 0},
209 {_Literal, "3.14159265", 0, 0},
210 {_Literal, "1e0", 0, 0},
211 {_Literal, "1e+100", 0, 0},
212 {_Literal, "1e-100", 0, 0},
213 {_Literal, "2.71828e-1000", 0, 0},
214 {_Literal, "0i", 0, 0},
215 {_Literal, "1i", 0, 0},
216 {_Literal, "012345678901234567889i", 0, 0},
217 {_Literal, "123456789012345678890i", 0, 0},
218 {_Literal, "0.i", 0, 0},
219 {_Literal, ".0i", 0, 0},
220 {_Literal, "3.14159265i", 0, 0},
221 {_Literal, "1e0i", 0, 0},
222 {_Literal, "1e+100i", 0, 0},
223 {_Literal, "1e-100i", 0, 0},
224 {_Literal, "2.71828e-1000i", 0, 0},
225 {_Literal, "'a'", 0, 0},
226 {_Literal, "'\\000'", 0, 0},
227 {_Literal, "'\\xFF'", 0, 0},
228 {_Literal, "'\\uff16'", 0, 0},
229 {_Literal, "'\\U0000ff16'", 0, 0},
230 {_Literal, "`foobar`", 0, 0},
231 {_Literal, "`foo\tbar`", 0, 0},
232 {_Literal, "`\r`", 0, 0},
233
234
235 {_Operator, "!", Not, 0},
236 {_Operator, "~", Tilde, 0},
237
238 {_Operator, "||", OrOr, precOrOr},
239
240 {_Operator, "&&", AndAnd, precAndAnd},
241
242 {_Operator, "==", Eql, precCmp},
243 {_Operator, "!=", Neq, precCmp},
244 {_Operator, "<", Lss, precCmp},
245 {_Operator, "<=", Leq, precCmp},
246 {_Operator, ">", Gtr, precCmp},
247 {_Operator, ">=", Geq, precCmp},
248
249 {_Operator, "+", Add, precAdd},
250 {_Operator, "-", Sub, precAdd},
251 {_Operator, "|", Or, precAdd},
252 {_Operator, "^", Xor, precAdd},
253
254 {_Star, "*", Mul, precMul},
255 {_Operator, "/", Div, precMul},
256 {_Operator, "%", Rem, precMul},
257 {_Operator, "&", And, precMul},
258 {_Operator, "&^", AndNot, precMul},
259 {_Operator, "<<", Shl, precMul},
260 {_Operator, ">>", Shr, precMul},
261
262
263 {_AssignOp, "+=", Add, precAdd},
264 {_AssignOp, "-=", Sub, precAdd},
265 {_AssignOp, "|=", Or, precAdd},
266 {_AssignOp, "^=", Xor, precAdd},
267
268 {_AssignOp, "*=", Mul, precMul},
269 {_AssignOp, "/=", Div, precMul},
270 {_AssignOp, "%=", Rem, precMul},
271 {_AssignOp, "&=", And, precMul},
272 {_AssignOp, "&^=", AndNot, precMul},
273 {_AssignOp, "<<=", Shl, precMul},
274 {_AssignOp, ">>=", Shr, precMul},
275
276
277 {_IncOp, "++", Add, precAdd},
278 {_IncOp, "--", Sub, precAdd},
279 {_Assign, "=", 0, 0},
280 {_Define, ":=", 0, 0},
281 {_Arrow, "<-", 0, 0},
282
283
284 {_Lparen, "(", 0, 0},
285 {_Lbrack, "[", 0, 0},
286 {_Lbrace, "{", 0, 0},
287 {_Rparen, ")", 0, 0},
288 {_Rbrack, "]", 0, 0},
289 {_Rbrace, "}", 0, 0},
290 {_Comma, ",", 0, 0},
291 {_Semi, ";", 0, 0},
292 {_Colon, ":", 0, 0},
293 {_Dot, ".", 0, 0},
294 {_DotDotDot, "...", 0, 0},
295
296
297 {_Break, "break", 0, 0},
298 {_Case, "case", 0, 0},
299 {_Chan, "chan", 0, 0},
300 {_Const, "const", 0, 0},
301 {_Continue, "continue", 0, 0},
302 {_Default, "default", 0, 0},
303 {_Defer, "defer", 0, 0},
304 {_Else, "else", 0, 0},
305 {_Fallthrough, "fallthrough", 0, 0},
306 {_For, "for", 0, 0},
307 {_Func, "func", 0, 0},
308 {_Go, "go", 0, 0},
309 {_Goto, "goto", 0, 0},
310 {_If, "if", 0, 0},
311 {_Import, "import", 0, 0},
312 {_Interface, "interface", 0, 0},
313 {_Map, "map", 0, 0},
314 {_Package, "package", 0, 0},
315 {_Range, "range", 0, 0},
316 {_Return, "return", 0, 0},
317 {_Select, "select", 0, 0},
318 {_Struct, "struct", 0, 0},
319 {_Switch, "switch", 0, 0},
320 {_Type, "type", 0, 0},
321 {_Var, "var", 0, 0},
322 }
323
324 func TestComments(t *testing.T) {
325 type comment struct {
326 line, col uint
327 text string
328 }
329
330 for _, test := range []struct {
331 src string
332 want comment
333 }{
334
335 {"no comment here", comment{0, 0, ""}},
336 {" /", comment{0, 0, ""}},
337 {"\n /*/", comment{0, 0, ""}},
338
339
340 {"// line comment\n", comment{0, 0, "// line comment"}},
341 {"package p // line comment\n", comment{0, 10, "// line comment"}},
342 {"//\n//\n\t// want this one\r\n", comment{2, 1, "// want this one\r"}},
343 {"\n\n//\n", comment{2, 0, "//"}},
344 {"//", comment{0, 0, "//"}},
345
346
347 {"123/* regular comment */", comment{0, 3, "/* regular comment */"}},
348 {"package p /* regular comment", comment{0, 0, ""}},
349 {"\n\n\n/*\n*//* want this one */", comment{4, 2, "/* want this one */"}},
350 {"\n\n/**/", comment{2, 0, "/**/"}},
351 {"/*", comment{0, 0, ""}},
352 } {
353 var s scanner
354 var got comment
355 s.init(strings.NewReader(test.src), func(line, col uint, msg string) {
356 if msg[0] != '/' {
357
358 if msg != "comment not terminated" {
359 t.Errorf("%q: %s", test.src, msg)
360 }
361 return
362 }
363 got = comment{line - linebase, col - colbase, msg}
364 }, comments)
365
366 for {
367 s.next()
368 if s.tok == _EOF {
369 break
370 }
371 }
372
373 want := test.want
374 if got.line != want.line || got.col != want.col {
375 t.Errorf("%q: got position %d:%d; want %d:%d", test.src, got.line, got.col, want.line, want.col)
376 }
377 if got.text != want.text {
378 t.Errorf("%q: got %q; want %q", test.src, got.text, want.text)
379 }
380 }
381 }
382
383 func TestNumbers(t *testing.T) {
384 for _, test := range []struct {
385 kind LitKind
386 src, tokens, err string
387 }{
388
389 {IntLit, "0b0", "0b0", ""},
390 {IntLit, "0b1010", "0b1010", ""},
391 {IntLit, "0B1110", "0B1110", ""},
392
393 {IntLit, "0b", "0b", "binary literal has no digits"},
394 {IntLit, "0b0190", "0b0190", "invalid digit '9' in binary literal"},
395 {IntLit, "0b01a0", "0b01 a0", ""},
396
397 {FloatLit, "0b.", "0b.", "invalid radix point in binary literal"},
398 {FloatLit, "0b.1", "0b.1", "invalid radix point in binary literal"},
399 {FloatLit, "0b1.0", "0b1.0", "invalid radix point in binary literal"},
400 {FloatLit, "0b1e10", "0b1e10", "'e' exponent requires decimal mantissa"},
401 {FloatLit, "0b1P-1", "0b1P-1", "'P' exponent requires hexadecimal mantissa"},
402
403 {ImagLit, "0b10i", "0b10i", ""},
404 {ImagLit, "0b10.0i", "0b10.0i", "invalid radix point in binary literal"},
405
406
407 {IntLit, "0o0", "0o0", ""},
408 {IntLit, "0o1234", "0o1234", ""},
409 {IntLit, "0O1234", "0O1234", ""},
410
411 {IntLit, "0o", "0o", "octal literal has no digits"},
412 {IntLit, "0o8123", "0o8123", "invalid digit '8' in octal literal"},
413 {IntLit, "0o1293", "0o1293", "invalid digit '9' in octal literal"},
414 {IntLit, "0o12a3", "0o12 a3", ""},
415
416 {FloatLit, "0o.", "0o.", "invalid radix point in octal literal"},
417 {FloatLit, "0o.2", "0o.2", "invalid radix point in octal literal"},
418 {FloatLit, "0o1.2", "0o1.2", "invalid radix point in octal literal"},
419 {FloatLit, "0o1E+2", "0o1E+2", "'E' exponent requires decimal mantissa"},
420 {FloatLit, "0o1p10", "0o1p10", "'p' exponent requires hexadecimal mantissa"},
421
422 {ImagLit, "0o10i", "0o10i", ""},
423 {ImagLit, "0o10e0i", "0o10e0i", "'e' exponent requires decimal mantissa"},
424
425
426 {IntLit, "0", "0", ""},
427 {IntLit, "0123", "0123", ""},
428
429 {IntLit, "08123", "08123", "invalid digit '8' in octal literal"},
430 {IntLit, "01293", "01293", "invalid digit '9' in octal literal"},
431 {IntLit, "0F.", "0 F .", ""},
432 {IntLit, "0123F.", "0123 F .", ""},
433 {IntLit, "0123456x", "0123456 x", ""},
434
435
436 {IntLit, "1", "1", ""},
437 {IntLit, "1234", "1234", ""},
438
439 {IntLit, "1f", "1 f", ""},
440
441 {ImagLit, "0i", "0i", ""},
442 {ImagLit, "0678i", "0678i", ""},
443
444
445 {FloatLit, "0.", "0.", ""},
446 {FloatLit, "123.", "123.", ""},
447 {FloatLit, "0123.", "0123.", ""},
448
449 {FloatLit, ".0", ".0", ""},
450 {FloatLit, ".123", ".123", ""},
451 {FloatLit, ".0123", ".0123", ""},
452
453 {FloatLit, "0.0", "0.0", ""},
454 {FloatLit, "123.123", "123.123", ""},
455 {FloatLit, "0123.0123", "0123.0123", ""},
456
457 {FloatLit, "0e0", "0e0", ""},
458 {FloatLit, "123e+0", "123e+0", ""},
459 {FloatLit, "0123E-1", "0123E-1", ""},
460
461 {FloatLit, "0.e+1", "0.e+1", ""},
462 {FloatLit, "123.E-10", "123.E-10", ""},
463 {FloatLit, "0123.e123", "0123.e123", ""},
464
465 {FloatLit, ".0e-1", ".0e-1", ""},
466 {FloatLit, ".123E+10", ".123E+10", ""},
467 {FloatLit, ".0123E123", ".0123E123", ""},
468
469 {FloatLit, "0.0e1", "0.0e1", ""},
470 {FloatLit, "123.123E-10", "123.123E-10", ""},
471 {FloatLit, "0123.0123e+456", "0123.0123e+456", ""},
472
473 {FloatLit, "0e", "0e", "exponent has no digits"},
474 {FloatLit, "0E+", "0E+", "exponent has no digits"},
475 {FloatLit, "1e+f", "1e+ f", "exponent has no digits"},
476 {FloatLit, "0p0", "0p0", "'p' exponent requires hexadecimal mantissa"},
477 {FloatLit, "1.0P-1", "1.0P-1", "'P' exponent requires hexadecimal mantissa"},
478
479 {ImagLit, "0.i", "0.i", ""},
480 {ImagLit, ".123i", ".123i", ""},
481 {ImagLit, "123.123i", "123.123i", ""},
482 {ImagLit, "123e+0i", "123e+0i", ""},
483 {ImagLit, "123.E-10i", "123.E-10i", ""},
484 {ImagLit, ".123E+10i", ".123E+10i", ""},
485
486
487 {IntLit, "0x0", "0x0", ""},
488 {IntLit, "0x1234", "0x1234", ""},
489 {IntLit, "0xcafef00d", "0xcafef00d", ""},
490 {IntLit, "0XCAFEF00D", "0XCAFEF00D", ""},
491
492 {IntLit, "0x", "0x", "hexadecimal literal has no digits"},
493 {IntLit, "0x1g", "0x1 g", ""},
494
495 {ImagLit, "0xf00i", "0xf00i", ""},
496
497
498 {FloatLit, "0x0p0", "0x0p0", ""},
499 {FloatLit, "0x12efp-123", "0x12efp-123", ""},
500 {FloatLit, "0xABCD.p+0", "0xABCD.p+0", ""},
501 {FloatLit, "0x.0189P-0", "0x.0189P-0", ""},
502 {FloatLit, "0x1.ffffp+1023", "0x1.ffffp+1023", ""},
503
504 {FloatLit, "0x.", "0x.", "hexadecimal literal has no digits"},
505 {FloatLit, "0x0.", "0x0.", "hexadecimal mantissa requires a 'p' exponent"},
506 {FloatLit, "0x.0", "0x.0", "hexadecimal mantissa requires a 'p' exponent"},
507 {FloatLit, "0x1.1", "0x1.1", "hexadecimal mantissa requires a 'p' exponent"},
508 {FloatLit, "0x1.1e0", "0x1.1e0", "hexadecimal mantissa requires a 'p' exponent"},
509 {FloatLit, "0x1.2gp1a", "0x1.2 gp1a", "hexadecimal mantissa requires a 'p' exponent"},
510 {FloatLit, "0x0p", "0x0p", "exponent has no digits"},
511 {FloatLit, "0xeP-", "0xeP-", "exponent has no digits"},
512 {FloatLit, "0x1234PAB", "0x1234P AB", "exponent has no digits"},
513 {FloatLit, "0x1.2p1a", "0x1.2p1 a", ""},
514
515 {ImagLit, "0xf00.bap+12i", "0xf00.bap+12i", ""},
516
517
518 {IntLit, "0b_1000_0001", "0b_1000_0001", ""},
519 {IntLit, "0o_600", "0o_600", ""},
520 {IntLit, "0_466", "0_466", ""},
521 {IntLit, "1_000", "1_000", ""},
522 {FloatLit, "1_000.000_1", "1_000.000_1", ""},
523 {ImagLit, "10e+1_2_3i", "10e+1_2_3i", ""},
524 {IntLit, "0x_f00d", "0x_f00d", ""},
525 {FloatLit, "0x_f00d.0p1_2", "0x_f00d.0p1_2", ""},
526
527 {IntLit, "0b__1000", "0b__1000", "'_' must separate successive digits"},
528 {IntLit, "0o60___0", "0o60___0", "'_' must separate successive digits"},
529 {IntLit, "0466_", "0466_", "'_' must separate successive digits"},
530 {FloatLit, "1_.", "1_.", "'_' must separate successive digits"},
531 {FloatLit, "0._1", "0._1", "'_' must separate successive digits"},
532 {FloatLit, "2.7_e0", "2.7_e0", "'_' must separate successive digits"},
533 {ImagLit, "10e+12_i", "10e+12_i", "'_' must separate successive digits"},
534 {IntLit, "0x___0", "0x___0", "'_' must separate successive digits"},
535 {FloatLit, "0x1.0_p0", "0x1.0_p0", "'_' must separate successive digits"},
536 } {
537 var s scanner
538 var err string
539 s.init(strings.NewReader(test.src), func(_, _ uint, msg string) {
540 if err == "" {
541 err = msg
542 }
543 }, 0)
544
545 for i, want := range strings.Split(test.tokens, " ") {
546 err = ""
547 s.next()
548
549 if err != "" && !s.bad {
550 t.Errorf("%q: got error but bad not set", test.src)
551 }
552
553
554 var lit string
555 switch s.tok {
556 case _Name, _Literal:
557 lit = s.lit
558 case _Dot:
559 lit = "."
560 }
561
562 if i == 0 {
563 if s.tok != _Literal || s.kind != test.kind {
564 t.Errorf("%q: got token %s (kind = %d); want literal (kind = %d)", test.src, s.tok, s.kind, test.kind)
565 }
566 if err != test.err {
567 t.Errorf("%q: got error %q; want %q", test.src, err, test.err)
568 }
569 }
570
571 if lit != want {
572 t.Errorf("%q: got literal %q (%s); want %s", test.src, lit, s.tok, want)
573 }
574 }
575
576
577 s.next()
578 if s.tok == _Semi {
579 s.next()
580 }
581 if s.tok != _EOF {
582 t.Errorf("%q: got %s; want EOF", test.src, s.tok)
583 }
584 }
585 }
586
587 func TestScanErrors(t *testing.T) {
588 for _, test := range []struct {
589 src, err string
590 line, col uint
591 }{
592
593
594
595
596
597 {"fo\x00o", "invalid NUL character", 0, 2},
598 {"foo\n\ufeff bar", "invalid BOM in the middle of the file", 1, 0},
599 {"foo\n\n\xff ", "invalid UTF-8 encoding", 2, 0},
600
601
602 {"\u00BD" , "invalid character U+00BD '½' in identifier", 0, 0},
603 {"\U0001d736\U0001d737\U0001d738_½" , "invalid character U+00BD '½' in identifier", 0, 13 },
604 {"\U0001d7d8" , "identifier cannot begin with digit U+1D7D8 '𝟘'", 0, 0},
605 {"foo\U0001d7d8_½" , "invalid character U+00BD '½' in identifier", 0, 8 },
606
607 {"x + #y", "invalid character U+0023 '#'", 0, 4},
608 {"foo$bar = 0", "invalid character U+0024 '$'", 0, 3},
609 {"0123456789", "invalid digit '8' in octal literal", 0, 8},
610 {"0123456789. /* foobar", "comment not terminated", 0, 12},
611 {"0123456789e0 /*\nfoobar", "comment not terminated", 0, 13},
612 {"var a, b = 09, 07\n", "invalid digit '9' in octal literal", 0, 12},
613
614 {`''`, "empty rune literal or unescaped '", 0, 1},
615 {"'\n", "newline in rune literal", 0, 1},
616 {`'\`, "rune literal not terminated", 0, 0},
617 {`'\'`, "rune literal not terminated", 0, 0},
618 {`'\x`, "rune literal not terminated", 0, 0},
619 {`'\x'`, "invalid character '\\'' in hexadecimal escape", 0, 3},
620 {`'\y'`, "unknown escape", 0, 2},
621 {`'\x0'`, "invalid character '\\'' in hexadecimal escape", 0, 4},
622 {`'\00'`, "invalid character '\\'' in octal escape", 0, 4},
623 {`'\377' /*`, "comment not terminated", 0, 7},
624 {`'\378`, "invalid character '8' in octal escape", 0, 4},
625 {`'\400'`, "octal escape value 256 > 255", 0, 5},
626 {`'xx`, "rune literal not terminated", 0, 0},
627 {`'xx'`, "more than one character in rune literal", 0, 0},
628
629 {"\n \"foo\n", "newline in string", 1, 7},
630 {`"`, "string not terminated", 0, 0},
631 {`"foo`, "string not terminated", 0, 0},
632 {"`", "string not terminated", 0, 0},
633 {"`foo", "string not terminated", 0, 0},
634 {"/*/", "comment not terminated", 0, 0},
635 {"/*\n\nfoo", "comment not terminated", 0, 0},
636 {`"\`, "string not terminated", 0, 0},
637 {`"\"`, "string not terminated", 0, 0},
638 {`"\x`, "string not terminated", 0, 0},
639 {`"\x"`, "invalid character '\"' in hexadecimal escape", 0, 3},
640 {`"\y"`, "unknown escape", 0, 2},
641 {`"\x0"`, "invalid character '\"' in hexadecimal escape", 0, 4},
642 {`"\00"`, "invalid character '\"' in octal escape", 0, 4},
643 {`"\377" /*`, "comment not terminated", 0, 7},
644 {`"\378"`, "invalid character '8' in octal escape", 0, 4},
645 {`"\400"`, "octal escape value 256 > 255", 0, 5},
646
647 {`s := "foo\z"`, "unknown escape", 0, 10},
648 {`s := "foo\z00\nbar"`, "unknown escape", 0, 10},
649 {`"\x`, "string not terminated", 0, 0},
650 {`"\x"`, "invalid character '\"' in hexadecimal escape", 0, 3},
651 {`var s string = "\x"`, "invalid character '\"' in hexadecimal escape", 0, 18},
652 {`return "\Uffffffff"`, "escape is invalid Unicode code point U+FFFFFFFF", 0, 18},
653
654 {"0b.0", "invalid radix point in binary literal", 0, 2},
655 {"0x.p0\n", "hexadecimal literal has no digits", 0, 3},
656
657
658 {"package p\n\n\xef", "invalid UTF-8 encoding", 2, 0},
659 } {
660 var s scanner
661 var line, col uint
662 var err string
663 s.init(strings.NewReader(test.src), func(l, c uint, msg string) {
664 if err == "" {
665 line, col = l-linebase, c-colbase
666 err = msg
667 }
668 }, 0)
669
670 for {
671 s.next()
672 if s.tok == _EOF {
673 break
674 }
675 }
676
677 if err != "" {
678 if err != test.err {
679 t.Errorf("%q: got err = %q; want %q", test.src, err, test.err)
680 }
681 if line != test.line {
682 t.Errorf("%q: got line = %d; want %d", test.src, line, test.line)
683 }
684 if col != test.col {
685 t.Errorf("%q: got col = %d; want %d", test.src, col, test.col)
686 }
687 } else {
688 t.Errorf("%q: got no error; want %q", test.src, test.err)
689 }
690 }
691 }
692
693 func TestDirectives(t *testing.T) {
694 for _, src := range []string{
695 "line",
696 "// line",
697 "//line",
698 "//line foo",
699 "//line foo%bar",
700
701 "go",
702 "// go:",
703 "//go:",
704 "//go :foo",
705 "//go:foo",
706 "//go:foo%bar",
707 } {
708 got := ""
709 var s scanner
710 s.init(strings.NewReader(src), func(_, col uint, msg string) {
711 if col != colbase {
712 t.Errorf("%s: got col = %d; want %d", src, col, colbase)
713 }
714 if msg == "" {
715 t.Errorf("%s: handler called with empty msg", src)
716 }
717 got = msg
718 }, directives)
719
720 s.next()
721 if strings.HasPrefix(src, "//line ") || strings.HasPrefix(src, "//go:") {
722
723 if got != src {
724 t.Errorf("got %s; want %s", got, src)
725 }
726 } else {
727
728 if got != "" {
729 t.Errorf("got %s for %s", got, src)
730 }
731 }
732 }
733 }
734
735 func TestIssue21938(t *testing.T) {
736 s := "/*" + strings.Repeat(" ", 4089) + "*/ .5"
737
738 var got scanner
739 got.init(strings.NewReader(s), errh, 0)
740 got.next()
741
742 if got.tok != _Literal || got.lit != ".5" {
743 t.Errorf("got %s %q; want %s %q", got.tok, got.lit, _Literal, ".5")
744 }
745 }
746
747 func TestIssue33961(t *testing.T) {
748 literals := `08__ 0b.p 0b_._p 0x.e 0x.p`
749 for _, lit := range strings.Split(literals, " ") {
750 n := 0
751 var got scanner
752 got.init(strings.NewReader(lit), func(_, _ uint, msg string) {
753
754 n++
755 }, 0)
756 got.next()
757
758 if n != 1 {
759 t.Errorf("%q: got %d errors; want 1", lit, n)
760 continue
761 }
762
763 if !got.bad {
764 t.Errorf("%q: got error but bad not set", lit)
765 }
766 }
767 }
768
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