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/third_party/gofrontend/libgo/go/math/big/floatconv_test.go

http://github.com/axw/llgo
Go | 573 lines | 426 code | 70 blank | 77 comment | 36 complexity | d38bc545390daaacea5abc209fb552b3 MD5 | raw file
Possible License(s): BSD-3-Clause, MIT 
    

  1. // Copyright 2015 The Go Authors. All rights reserved.
    2. 

  2. // Use of this source code is governed by a BSD-style
    3. 

  3. // license that can be found in the LICENSE file.
    4. 

  4. 

  5. package big
    6. 

  6. 

  7. import (
    8. 

  8. 	"fmt"
    9. 

  9. 	"math"
    10. 

  10. 	"strconv"
    11. 

  11. 	"testing"
    12. 

  12. )
    13. 

  13. 

  14. func TestFloatSetFloat64String(t *testing.T) {
    15. 

  15. 	inf := math.Inf(0)
    16. 

  16. 	nan := math.NaN()
    17. 

  17. 

  18. 	for _, test := range []struct {
    19. 

  19. 		s string
    20. 

  20. 		x float64 // NaNs represent invalid inputs
    21. 

  21. 	}{
    22. 

  22. 		// basics
    23. 

  23. 		{"0", 0},
    24. 

  24. 		{"-0", -0},
    25. 

  25. 		{"+0", 0},
    26. 

  26. 		{"1", 1},
    27. 

  27. 		{"-1", -1},
    28. 

  28. 		{"+1", 1},
    29. 

  29. 		{"1.234", 1.234},
    30. 

  30. 		{"-1.234", -1.234},
    31. 

  31. 		{"+1.234", 1.234},
    32. 

  32. 		{".1", 0.1},
    33. 

  33. 		{"1.", 1},
    34. 

  34. 		{"+1.", 1},
    35. 

  35. 

  36. 		// various zeros
    37. 

  37. 		{"0e100", 0},
    38. 

  38. 		{"-0e+100", 0},
    39. 

  39. 		{"+0e-100", 0},
    40. 

  40. 		{"0E100", 0},
    41. 

  41. 		{"-0E+100", 0},
    42. 

  42. 		{"+0E-100", 0},
    43. 

  43. 

  44. 		// various decimal exponent formats
    45. 

  45. 		{"1.e10", 1e10},
    46. 

  46. 		{"1e+10", 1e10},
    47. 

  47. 		{"+1e-10", 1e-10},
    48. 

  48. 		{"1E10", 1e10},
    49. 

  49. 		{"1.E+10", 1e10},
    50. 

  50. 		{"+1E-10", 1e-10},
    51. 

  51. 

  52. 		// infinities
    53. 

  53. 		{"Inf", inf},
    54. 

  54. 		{"+Inf", inf},
    55. 

  55. 		{"-Inf", -inf},
    56. 

  56. 		{"inf", inf},
    57. 

  57. 		{"+inf", inf},
    58. 

  58. 		{"-inf", -inf},
    59. 

  59. 

  60. 		// invalid numbers
    61. 

  61. 		{"", nan},
    62. 

  62. 		{"-", nan},
    63. 

  63. 		{"0x", nan},
    64. 

  64. 		{"0e", nan},
    65. 

  65. 		{"1.2ef", nan},
    66. 

  66. 		{"2..3", nan},
    67. 

  67. 		{"123..", nan},
    68. 

  68. 		{"infinity", nan},
    69. 

  69. 		{"foobar", nan},
    70. 

  70. 

  71. 		// misc decimal values
    72. 

  72. 		{"3.14159265", 3.14159265},
    73. 

  73. 		{"-687436.79457e-245", -687436.79457e-245},
    74. 

  74. 		{"-687436.79457E245", -687436.79457e245},
    75. 

  75. 		{".0000000000000000000000000000000000000001", 1e-40},
    76. 

  76. 		{"+10000000000000000000000000000000000000000e-0", 1e40},
    77. 

  77. 

  78. 		// decimal mantissa, binary exponent
    79. 

  79. 		{"0p0", 0},
    80. 

  80. 		{"-0p0", -0},
    81. 

  81. 		{"1p10", 1 << 10},
    82. 

  82. 		{"1p+10", 1 << 10},
    83. 

  83. 		{"+1p-10", 1.0 / (1 << 10)},
    84. 

  84. 		{"1024p-12", 0.25},
    85. 

  85. 		{"-1p10", -1024},
    86. 

  86. 		{"1.5p1", 3},
    87. 

  87. 

  88. 		// binary mantissa, decimal exponent
    89. 

  89. 		{"0b0", 0},
    90. 

  90. 		{"-0b0", -0},
    91. 

  91. 		{"0b0e+10", 0},
    92. 

  92. 		{"-0b0e-10", -0},
    93. 

  93. 		{"0b1010", 10},
    94. 

  94. 		{"0B1010E2", 1000},
    95. 

  95. 		{"0b.1", 0.5},
    96. 

  96. 		{"0b.001", 0.125},
    97. 

  97. 		{"0b.001e3", 125},
    98. 

  98. 

  99. 		// binary mantissa, binary exponent
    100. 

  100. 		{"0b0p+10", 0},
    101. 

  101. 		{"-0b0p-10", -0},
    102. 

  102. 		{"0b.1010p4", 10},
    103. 

  103. 		{"0b1p-1", 0.5},
    104. 

  104. 		{"0b001p-3", 0.125},
    105. 

  105. 		{"0b.001p3", 1},
    106. 

  106. 		{"0b0.01p2", 1},
    107. 

  107. 

  108. 		// hexadecimal mantissa and exponent
    109. 

  109. 		{"0x0", 0},
    110. 

  110. 		{"-0x0", -0},
    111. 

  111. 		{"0x0p+10", 0},
    112. 

  112. 		{"-0x0p-10", -0},
    113. 

  113. 		{"0xff", 255},
    114. 

  114. 		{"0X.8p1", 1},
    115. 

  115. 		{"-0X0.00008p16", -0.5},
    116. 

  116. 		{"0x0.0000000000001p-1022", math.SmallestNonzeroFloat64},
    117. 

  117. 		{"0x1.fffffffffffffp1023", math.MaxFloat64},
    118. 

  118. 	} {
    119. 

  119. 		var x Float
    120. 

  120. 		x.SetPrec(53)
    121. 

  121. 		_, ok := x.SetString(test.s)
    122. 

  122. 		if math.IsNaN(test.x) {
    123. 

  123. 			// test.s is invalid
    124. 

  124. 			if ok {
    125. 

  125. 				t.Errorf("%s: want parse error", test.s)
    126. 

  126. 			}
    127. 

  127. 			continue
    128. 

  128. 		}
    129. 

  129. 		// test.s is valid
    130. 

  130. 		if !ok {
    131. 

  131. 			t.Errorf("%s: got parse error", test.s)
    132. 

  132. 			continue
    133. 

  133. 		}
    134. 

  134. 		f, _ := x.Float64()
    135. 

  135. 		want := new(Float).SetFloat64(test.x)
    136. 

  136. 		if x.Cmp(want) != 0 {
    137. 

  137. 			t.Errorf("%s: got %s (%v); want %v", test.s, &x, f, test.x)
    138. 

  138. 		}
    139. 

  139. 	}
    140. 

  140. }
    141. 

  141. 

  142. const (
    143. 

  143. 	below1e23 = 99999999999999974834176
    144. 

  144. 	above1e23 = 100000000000000008388608
    145. 

  145. )
    146. 

  146. 

  147. func TestFloat64Text(t *testing.T) {
    148. 

  148. 	for _, test := range []struct {
    149. 

  149. 		x      float64
    150. 

  150. 		format byte
    151. 

  151. 		prec   int
    152. 

  152. 		want   string
    153. 

  153. 	}{
    154. 

  154. 		{0, 'f', 0, "0"},
    155. 

  155. 		{math.Copysign(0, -1), 'f', 0, "-0"},
    156. 

  156. 		{1, 'f', 0, "1"},
    157. 

  157. 		{-1, 'f', 0, "-1"},
    158. 

  158. 

  159. 		{0.001, 'e', 0, "1e-03"},
    160. 

  160. 		{0.459, 'e', 0, "5e-01"},
    161. 

  161. 		{1.459, 'e', 0, "1e+00"},
    162. 

  162. 		{2.459, 'e', 1, "2.5e+00"},
    163. 

  163. 		{3.459, 'e', 2, "3.46e+00"},
    164. 

  164. 		{4.459, 'e', 3, "4.459e+00"},
    165. 

  165. 		{5.459, 'e', 4, "5.4590e+00"},
    166. 

  166. 

  167. 		{0.001, 'f', 0, "0"},
    168. 

  168. 		{0.459, 'f', 0, "0"},
    169. 

  169. 		{1.459, 'f', 0, "1"},
    170. 

  170. 		{2.459, 'f', 1, "2.5"},
    171. 

  171. 		{3.459, 'f', 2, "3.46"},
    172. 

  172. 		{4.459, 'f', 3, "4.459"},
    173. 

  173. 		{5.459, 'f', 4, "5.4590"},
    174. 

  174. 

  175. 		{0, 'b', 0, "0"},
    176. 

  176. 		{math.Copysign(0, -1), 'b', 0, "-0"},
    177. 

  177. 		{1.0, 'b', 0, "4503599627370496p-52"},
    178. 

  178. 		{-1.0, 'b', 0, "-4503599627370496p-52"},
    179. 

  179. 		{4503599627370496, 'b', 0, "4503599627370496p+0"},
    180. 

  180. 

  181. 		{0, 'p', 0, "0"},
    182. 

  182. 		{math.Copysign(0, -1), 'p', 0, "-0"},
    183. 

  183. 		{1024.0, 'p', 0, "0x.8p+11"},
    184. 

  184. 		{-1024.0, 'p', 0, "-0x.8p+11"},
    185. 

  185. 

  186. 		// all test cases below from strconv/ftoa_test.go
    187. 

  187. 		{1, 'e', 5, "1.00000e+00"},
    188. 

  188. 		{1, 'f', 5, "1.00000"},
    189. 

  189. 		{1, 'g', 5, "1"},
    190. 

  190. 		// {1, 'g', -1, "1"},
    191. 

  191. 		// {20, 'g', -1, "20"},
    192. 

  192. 		// {1234567.8, 'g', -1, "1.2345678e+06"},
    193. 

  193. 		// {200000, 'g', -1, "200000"},
    194. 

  194. 		// {2000000, 'g', -1, "2e+06"},
    195. 

  195. 

  196. 		// g conversion and zero suppression
    197. 

  197. 		{400, 'g', 2, "4e+02"},
    198. 

  198. 		{40, 'g', 2, "40"},
    199. 

  199. 		{4, 'g', 2, "4"},
    200. 

  200. 		{.4, 'g', 2, "0.4"},
    201. 

  201. 		{.04, 'g', 2, "0.04"},
    202. 

  202. 		{.004, 'g', 2, "0.004"},
    203. 

  203. 		{.0004, 'g', 2, "0.0004"},
    204. 

  204. 		{.00004, 'g', 2, "4e-05"},
    205. 

  205. 		{.000004, 'g', 2, "4e-06"},
    206. 

  206. 

  207. 		{0, 'e', 5, "0.00000e+00"},
    208. 

  208. 		{0, 'f', 5, "0.00000"},
    209. 

  209. 		{0, 'g', 5, "0"},
    210. 

  210. 		// {0, 'g', -1, "0"},
    211. 

  211. 

  212. 		{-1, 'e', 5, "-1.00000e+00"},
    213. 

  213. 		{-1, 'f', 5, "-1.00000"},
    214. 

  214. 		{-1, 'g', 5, "-1"},
    215. 

  215. 		// {-1, 'g', -1, "-1"},
    216. 

  216. 

  217. 		{12, 'e', 5, "1.20000e+01"},
    218. 

  218. 		{12, 'f', 5, "12.00000"},
    219. 

  219. 		{12, 'g', 5, "12"},
    220. 

  220. 		// {12, 'g', -1, "12"},
    221. 

  221. 

  222. 		{123456700, 'e', 5, "1.23457e+08"},
    223. 

  223. 		{123456700, 'f', 5, "123456700.00000"},
    224. 

  224. 		{123456700, 'g', 5, "1.2346e+08"},
    225. 

  225. 		// {123456700, 'g', -1, "1.234567e+08"},
    226. 

  226. 

  227. 		{1.2345e6, 'e', 5, "1.23450e+06"},
    228. 

  228. 		{1.2345e6, 'f', 5, "1234500.00000"},
    229. 

  229. 		{1.2345e6, 'g', 5, "1.2345e+06"},
    230. 

  230. 

  231. 		{1e23, 'e', 17, "9.99999999999999916e+22"},
    232. 

  232. 		{1e23, 'f', 17, "99999999999999991611392.00000000000000000"},
    233. 

  233. 		{1e23, 'g', 17, "9.9999999999999992e+22"},
    234. 

  234. 

  235. 		// {1e23, 'e', -1, "1e+23"},
    236. 

  236. 		// {1e23, 'f', -1, "100000000000000000000000"},
    237. 

  237. 		// {1e23, 'g', -1, "1e+23"},
    238. 

  238. 

  239. 		{below1e23, 'e', 17, "9.99999999999999748e+22"},
    240. 

  240. 		{below1e23, 'f', 17, "99999999999999974834176.00000000000000000"},
    241. 

  241. 		{below1e23, 'g', 17, "9.9999999999999975e+22"},
    242. 

  242. 

  243. 		// {below1e23, 'e', -1, "9.999999999999997e+22"},
    244. 

  244. 		// {below1e23, 'f', -1, "99999999999999970000000"},
    245. 

  245. 		// {below1e23, 'g', -1, "9.999999999999997e+22"},
    246. 

  246. 

  247. 		{above1e23, 'e', 17, "1.00000000000000008e+23"},
    248. 

  248. 		{above1e23, 'f', 17, "100000000000000008388608.00000000000000000"},
    249. 

  249. 		// {above1e23, 'g', 17, "1.0000000000000001e+23"},
    250. 

  250. 

  251. 		// {above1e23, 'e', -1, "1.0000000000000001e+23"},
    252. 

  252. 		// {above1e23, 'f', -1, "100000000000000010000000"},
    253. 

  253. 		// {above1e23, 'g', -1, "1.0000000000000001e+23"},
    254. 

  254. 

  255. 		// {fdiv(5e-304, 1e20), 'g', -1, "5e-324"},
    256. 

  256. 		// {fdiv(-5e-304, 1e20), 'g', -1, "-5e-324"},
    257. 

  257. 

  258. 		// {32, 'g', -1, "32"},
    259. 

  259. 		// {32, 'g', 0, "3e+01"},
    260. 

  260. 

  261. 		// {100, 'x', -1, "%x"},
    262. 

  262. 

  263. 		// {math.NaN(), 'g', -1, "NaN"},
    264. 

  264. 		// {-math.NaN(), 'g', -1, "NaN"},
    265. 

  265. 		{math.Inf(0), 'g', -1, "+Inf"},
    266. 

  266. 		{math.Inf(-1), 'g', -1, "-Inf"},
    267. 

  267. 		{-math.Inf(0), 'g', -1, "-Inf"},
    268. 

  268. 

  269. 		{-1, 'b', -1, "-4503599627370496p-52"},
    270. 

  270. 

  271. 		// fixed bugs
    272. 

  272. 		{0.9, 'f', 1, "0.9"},
    273. 

  273. 		{0.09, 'f', 1, "0.1"},
    274. 

  274. 		{0.0999, 'f', 1, "0.1"},
    275. 

  275. 		{0.05, 'f', 1, "0.1"},
    276. 

  276. 		{0.05, 'f', 0, "0"},
    277. 

  277. 		{0.5, 'f', 1, "0.5"},
    278. 

  278. 		{0.5, 'f', 0, "0"},
    279. 

  279. 		{1.5, 'f', 0, "2"},
    280. 

  280. 

  281. 		// http://www.exploringbinary.com/java-hangs-when-converting-2-2250738585072012e-308/
    282. 

  282. 		// {2.2250738585072012e-308, 'g', -1, "2.2250738585072014e-308"},
    283. 

  283. 		// http://www.exploringbinary.com/php-hangs-on-numeric-value-2-2250738585072011e-308/
    284. 

  284. 		// {2.2250738585072011e-308, 'g', -1, "2.225073858507201e-308"},
    285. 

  285. 

  286. 		// Issue 2625.
    287. 

  287. 		{383260575764816448, 'f', 0, "383260575764816448"},
    288. 

  288. 		// {383260575764816448, 'g', -1, "3.8326057576481645e+17"},
    289. 

  289. 	} {
    290. 

  290. 		f := new(Float).SetFloat64(test.x)
    291. 

  291. 		got := f.Text(test.format, test.prec)
    292. 

  292. 		if got != test.want {
    293. 

  293. 			t.Errorf("%v: got %s; want %s", test, got, test.want)
    294. 

  294. 		}
    295. 

  295. 

  296. 		if test.format == 'b' && test.x == 0 {
    297. 

  297. 			continue // 'b' format in strconv.Float requires knowledge of bias for 0.0
    298. 

  298. 		}
    299. 

  299. 		if test.format == 'p' {
    300. 

  300. 			continue // 'p' format not supported in strconv.Format
    301. 

  301. 		}
    302. 

  302. 

  303. 		// verify that Float format matches strconv format
    304. 

  304. 		want := strconv.FormatFloat(test.x, test.format, test.prec, 64)
    305. 

  305. 		if got != want {
    306. 

  306. 			t.Errorf("%v: got %s; want %s (strconv)", test, got, want)
    307. 

  307. 		}
    308. 

  308. 	}
    309. 

  309. }
    310. 

  310. 

  311. func TestFloatText(t *testing.T) {
    312. 

  312. 	for _, test := range []struct {
    313. 

  313. 		x      string
    314. 

  314. 		prec   uint
    315. 

  315. 		format byte
    316. 

  316. 		digits int
    317. 

  317. 		want   string
    318. 

  318. 	}{
    319. 

  319. 		{"0", 10, 'f', 0, "0"},
    320. 

  320. 		{"-0", 10, 'f', 0, "-0"},
    321. 

  321. 		{"1", 10, 'f', 0, "1"},
    322. 

  322. 		{"-1", 10, 'f', 0, "-1"},
    323. 

  323. 

  324. 		{"1.459", 100, 'e', 0, "1e+00"},
    325. 

  325. 		{"2.459", 100, 'e', 1, "2.5e+00"},
    326. 

  326. 		{"3.459", 100, 'e', 2, "3.46e+00"},
    327. 

  327. 		{"4.459", 100, 'e', 3, "4.459e+00"},
    328. 

  328. 		{"5.459", 100, 'e', 4, "5.4590e+00"},
    329. 

  329. 

  330. 		{"1.459", 100, 'E', 0, "1E+00"},
    331. 

  331. 		{"2.459", 100, 'E', 1, "2.5E+00"},
    332. 

  332. 		{"3.459", 100, 'E', 2, "3.46E+00"},
    333. 

  333. 		{"4.459", 100, 'E', 3, "4.459E+00"},
    334. 

  334. 		{"5.459", 100, 'E', 4, "5.4590E+00"},
    335. 

  335. 

  336. 		{"1.459", 100, 'f', 0, "1"},
    337. 

  337. 		{"2.459", 100, 'f', 1, "2.5"},
    338. 

  338. 		{"3.459", 100, 'f', 2, "3.46"},
    339. 

  339. 		{"4.459", 100, 'f', 3, "4.459"},
    340. 

  340. 		{"5.459", 100, 'f', 4, "5.4590"},
    341. 

  341. 

  342. 		{"1.459", 100, 'g', 0, "1"},
    343. 

  343. 		{"2.459", 100, 'g', 1, "2"},
    344. 

  344. 		{"3.459", 100, 'g', 2, "3.5"},
    345. 

  345. 		{"4.459", 100, 'g', 3, "4.46"},
    346. 

  346. 		{"5.459", 100, 'g', 4, "5.459"},
    347. 

  347. 

  348. 		{"1459", 53, 'g', 0, "1e+03"},
    349. 

  349. 		{"2459", 53, 'g', 1, "2e+03"},
    350. 

  350. 		{"3459", 53, 'g', 2, "3.5e+03"},
    351. 

  351. 		{"4459", 53, 'g', 3, "4.46e+03"},
    352. 

  352. 		{"5459", 53, 'g', 4, "5459"},
    353. 

  353. 

  354. 		{"1459", 53, 'G', 0, "1E+03"},
    355. 

  355. 		{"2459", 53, 'G', 1, "2E+03"},
    356. 

  356. 		{"3459", 53, 'G', 2, "3.5E+03"},
    357. 

  357. 		{"4459", 53, 'G', 3, "4.46E+03"},
    358. 

  358. 		{"5459", 53, 'G', 4, "5459"},
    359. 

  359. 

  360. 		{"3", 10, 'e', 40, "3.0000000000000000000000000000000000000000e+00"},
    361. 

  361. 		{"3", 10, 'f', 40, "3.0000000000000000000000000000000000000000"},
    362. 

  362. 		{"3", 10, 'g', 40, "3"},
    363. 

  363. 

  364. 		{"3e40", 100, 'e', 40, "3.0000000000000000000000000000000000000000e+40"},
    365. 

  365. 		{"3e40", 100, 'f', 4, "30000000000000000000000000000000000000000.0000"},
    366. 

  366. 		{"3e40", 100, 'g', 40, "3e+40"},
    367. 

  367. 

  368. 		// make sure "stupid" exponents don't stall the machine
    369. 

  369. 		{"1e1000000", 64, 'p', 0, "0x.88b3a28a05eade3ap+3321929"},
    370. 

  370. 		{"1e1000000000", 64, 'p', 0, "0x.ecc5f45aa573d3p+1538481529"},
    371. 

  371. 		{"1e-1000000", 64, 'p', 0, "0x.efb4542cc8ca418ap-3321928"},
    372. 

  372. 		{"1e-1000000000", 64, 'p', 0, "0x.8a64dd983a4c7dabp-1538481528"},
    373. 

  373. 

  374. 		// TODO(gri) need tests for actual large Floats
    375. 

  375. 

  376. 		{"0", 53, 'b', 0, "0"},
    377. 

  377. 		{"-0", 53, 'b', 0, "-0"},
    378. 

  378. 		{"1.0", 53, 'b', 0, "4503599627370496p-52"},
    379. 

  379. 		{"-1.0", 53, 'b', 0, "-4503599627370496p-52"},
    380. 

  380. 		{"4503599627370496", 53, 'b', 0, "4503599627370496p+0"},
    381. 

  381. 

  382. 		// issue 9939
    383. 

  383. 		{"3", 350, 'b', 0, "1720123961992553633708115671476565205597423741876210842803191629540192157066363606052513914832594264915968p-348"},
    384. 

  384. 		{"03", 350, 'b', 0, "1720123961992553633708115671476565205597423741876210842803191629540192157066363606052513914832594264915968p-348"},
    385. 

  385. 		{"3.", 350, 'b', 0, "1720123961992553633708115671476565205597423741876210842803191629540192157066363606052513914832594264915968p-348"},
    386. 

  386. 		{"3.0", 350, 'b', 0, "1720123961992553633708115671476565205597423741876210842803191629540192157066363606052513914832594264915968p-348"},
    387. 

  387. 		{"3.00", 350, 'b', 0, "1720123961992553633708115671476565205597423741876210842803191629540192157066363606052513914832594264915968p-348"},
    388. 

  388. 		{"3.000", 350, 'b', 0, "1720123961992553633708115671476565205597423741876210842803191629540192157066363606052513914832594264915968p-348"},
    389. 

  389. 

  390. 		{"3", 350, 'p', 0, "0x.cp+2"},
    391. 

  391. 		{"03", 350, 'p', 0, "0x.cp+2"},
    392. 

  392. 		{"3.", 350, 'p', 0, "0x.cp+2"},
    393. 

  393. 		{"3.0", 350, 'p', 0, "0x.cp+2"},
    394. 

  394. 		{"3.00", 350, 'p', 0, "0x.cp+2"},
    395. 

  395. 		{"3.000", 350, 'p', 0, "0x.cp+2"},
    396. 

  396. 

  397. 		{"0", 64, 'p', 0, "0"},
    398. 

  398. 		{"-0", 64, 'p', 0, "-0"},
    399. 

  399. 		{"1024.0", 64, 'p', 0, "0x.8p+11"},
    400. 

  400. 		{"-1024.0", 64, 'p', 0, "-0x.8p+11"},
    401. 

  401. 

  402. 		// unsupported format
    403. 

  403. 		{"3.14", 64, 'x', 0, "%x"},
    404. 

  404. 		{"-3.14", 64, 'x', 0, "%x"},
    405. 

  405. 	} {
    406. 

  406. 		f, _, err := ParseFloat(test.x, 0, test.prec, ToNearestEven)
    407. 

  407. 		if err != nil {
    408. 

  408. 			t.Errorf("%v: %s", test, err)
    409. 

  409. 			continue
    410. 

  410. 		}
    411. 

  411. 

  412. 		got := f.Text(test.format, test.digits)
    413. 

  413. 		if got != test.want {
    414. 

  414. 			t.Errorf("%v: got %s; want %s", test, got, test.want)
    415. 

  415. 		}
    416. 

  416. 

  417. 		// compare with strconv.FormatFloat output if possible
    418. 

  418. 		// ('p' format is not supported by strconv.FormatFloat,
    419. 

  419. 		// and its output for 0.0 prints a biased exponent value
    420. 

  420. 		// as in 0p-1074 which makes no sense to emulate here)
    421. 

  421. 		if test.prec == 53 && test.format != 'p' && f.Sign() != 0 {
    422. 

  422. 			f64, acc := f.Float64()
    423. 

  423. 			if acc != Exact {
    424. 

  424. 				t.Errorf("%v: expected exact conversion to float64", test)
    425. 

  425. 				continue
    426. 

  426. 			}
    427. 

  427. 			got := strconv.FormatFloat(f64, test.format, test.digits, 64)
    428. 

  428. 			if got != test.want {
    429. 

  429. 				t.Errorf("%v: got %s; want %s", test, got, test.want)
    430. 

  430. 			}
    431. 

  431. 		}
    432. 

  432. 	}
    433. 

  433. }
    434. 

  434. 

  435. func TestFloatFormat(t *testing.T) {
    436. 

  436. 	for _, test := range []struct {
    437. 

  437. 		format string
    438. 

  438. 		value  interface{} // float32, float64, or string (== 512bit *Float)
    439. 

  439. 		want   string
    440. 

  440. 	}{
    441. 

  441. 		// TODO(gri) uncomment the disabled 'g'/'G' formats
    442. 

  442. 		// 	     below once (*Float).Text supports prec < 0
    443. 

  443. 

  444. 		// from fmt/fmt_test.go
    445. 

  445. 		{"%+.3e", 0.0, "+0.000e+00"},
    446. 

  446. 		{"%+.3e", 1.0, "+1.000e+00"},
    447. 

  447. 		{"%+.3f", -1.0, "-1.000"},
    448. 

  448. 		{"%+.3F", -1.0, "-1.000"},
    449. 

  449. 		{"%+.3F", float32(-1.0), "-1.000"},
    450. 

  450. 		{"%+07.2f", 1.0, "+001.00"},
    451. 

  451. 		{"%+07.2f", -1.0, "-001.00"},
    452. 

  452. 		{"%+10.2f", +1.0, "     +1.00"},
    453. 

  453. 		{"%+10.2f", -1.0, "     -1.00"},
    454. 

  454. 		{"% .3E", -1.0, "-1.000E+00"},
    455. 

  455. 		{"% .3e", 1.0, " 1.000e+00"},
    456. 

  456. 		{"%+.3g", 0.0, "+0"},
    457. 

  457. 		{"%+.3g", 1.0, "+1"},
    458. 

  458. 		{"%+.3g", -1.0, "-1"},
    459. 

  459. 		{"% .3g", -1.0, "-1"},
    460. 

  460. 		{"% .3g", 1.0, " 1"},
    461. 

  461. 		{"%b", float32(1.0), "8388608p-23"},
    462. 

  462. 		{"%b", 1.0, "4503599627370496p-52"},
    463. 

  463. 

  464. 		// from fmt/fmt_test.go: old test/fmt_test.go
    465. 

  465. 		{"%e", 1.0, "1.000000e+00"},
    466. 

  466. 		{"%e", 1234.5678e3, "1.234568e+06"},
    467. 

  467. 		{"%e", 1234.5678e-8, "1.234568e-05"},
    468. 

  468. 		{"%e", -7.0, "-7.000000e+00"},
    469. 

  469. 		{"%e", -1e-9, "-1.000000e-09"},
    470. 

  470. 		{"%f", 1234.5678e3, "1234567.800000"},
    471. 

  471. 		{"%f", 1234.5678e-8, "0.000012"},
    472. 

  472. 		{"%f", -7.0, "-7.000000"},
    473. 

  473. 		{"%f", -1e-9, "-0.000000"},
    474. 

  474. 		// {"%g", 1234.5678e3, "1.2345678e+06"},
    475. 

  475. 		// {"%g", float32(1234.5678e3), "1.2345678e+06"},
    476. 

  476. 		// {"%g", 1234.5678e-8, "1.2345678e-05"},
    477. 

  477. 		{"%g", -7.0, "-7"},
    478. 

  478. 		{"%g", -1e-9, "-1e-09"},
    479. 

  479. 		{"%g", float32(-1e-9), "-1e-09"},
    480. 

  480. 		{"%E", 1.0, "1.000000E+00"},
    481. 

  481. 		{"%E", 1234.5678e3, "1.234568E+06"},
    482. 

  482. 		{"%E", 1234.5678e-8, "1.234568E-05"},
    483. 

  483. 		{"%E", -7.0, "-7.000000E+00"},
    484. 

  484. 		{"%E", -1e-9, "-1.000000E-09"},
    485. 

  485. 		// {"%G", 1234.5678e3, "1.2345678E+06"},
    486. 

  486. 		// {"%G", float32(1234.5678e3), "1.2345678E+06"},
    487. 

  487. 		// {"%G", 1234.5678e-8, "1.2345678E-05"},
    488. 

  488. 		{"%G", -7.0, "-7"},
    489. 

  489. 		{"%G", -1e-9, "-1E-09"},
    490. 

  490. 		{"%G", float32(-1e-9), "-1E-09"},
    491. 

  491. 

  492. 		{"%20.6e", 1.2345e3, "        1.234500e+03"},
    493. 

  493. 		{"%20.6e", 1.2345e-3, "        1.234500e-03"},
    494. 

  494. 		{"%20e", 1.2345e3, "        1.234500e+03"},
    495. 

  495. 		{"%20e", 1.2345e-3, "        1.234500e-03"},
    496. 

  496. 		{"%20.8e", 1.2345e3, "      1.23450000e+03"},
    497. 

  497. 		{"%20f", 1.23456789e3, "         1234.567890"},
    498. 

  498. 		{"%20f", 1.23456789e-3, "            0.001235"},
    499. 

  499. 		{"%20f", 12345678901.23456789, "  12345678901.234568"},
    500. 

  500. 		{"%-20f", 1.23456789e3, "1234.567890         "},
    501. 

  501. 		{"%20.8f", 1.23456789e3, "       1234.56789000"},
    502. 

  502. 		{"%20.8f", 1.23456789e-3, "          0.00123457"},
    503. 

  503. 		// {"%g", 1.23456789e3, "1234.56789"},
    504. 

  504. 		// {"%g", 1.23456789e-3, "0.00123456789"},
    505. 

  505. 		// {"%g", 1.23456789e20, "1.23456789e+20"},
    506. 

  506. 		{"%20e", math.Inf(1), "                +Inf"},
    507. 

  507. 		{"%-20f", math.Inf(-1), "-Inf                "},
    508. 

  508. 

  509. 		// from fmt/fmt_test.go: comparison of padding rules with C printf
    510. 

  510. 		{"%.2f", 1.0, "1.00"},
    511. 

  511. 		{"%.2f", -1.0, "-1.00"},
    512. 

  512. 		{"% .2f", 1.0, " 1.00"},
    513. 

  513. 		{"% .2f", -1.0, "-1.00"},
    514. 

  514. 		{"%+.2f", 1.0, "+1.00"},
    515. 

  515. 		{"%+.2f", -1.0, "-1.00"},
    516. 

  516. 		{"%7.2f", 1.0, "   1.00"},
    517. 

  517. 		{"%7.2f", -1.0, "  -1.00"},
    518. 

  518. 		{"% 7.2f", 1.0, "   1.00"},
    519. 

  519. 		{"% 7.2f", -1.0, "  -1.00"},
    520. 

  520. 		{"%+7.2f", 1.0, "  +1.00"},
    521. 

  521. 		{"%+7.2f", -1.0, "  -1.00"},
    522. 

  522. 		{"%07.2f", 1.0, "0001.00"},
    523. 

  523. 		{"%07.2f", -1.0, "-001.00"},
    524. 

  524. 		{"% 07.2f", 1.0, " 001.00"},
    525. 

  525. 		{"% 07.2f", -1.0, "-001.00"},
    526. 

  526. 		{"%+07.2f", 1.0, "+001.00"},
    527. 

  527. 		{"%+07.2f", -1.0, "-001.00"},
    528. 

  528. 

  529. 		// from fmt/fmt_test.go: zero padding does not apply to infinities
    530. 

  530. 		{"%020f", math.Inf(-1), "                -Inf"},
    531. 

  531. 		{"%020f", math.Inf(+1), "                +Inf"},
    532. 

  532. 		{"% 020f", math.Inf(-1), "                -Inf"},
    533. 

  533. 		{"% 020f", math.Inf(+1), "                 Inf"},
    534. 

  534. 		{"%+020f", math.Inf(-1), "                -Inf"},
    535. 

  535. 		{"%+020f", math.Inf(+1), "                +Inf"},
    536. 

  536. 		{"%20f", -1.0, "           -1.000000"},
    537. 

  537. 

  538. 		// handle %v like %g
    539. 

  539. 		{"%v", 0.0, "0"},
    540. 

  540. 		{"%v", -7.0, "-7"},
    541. 

  541. 		{"%v", -1e-9, "-1e-09"},
    542. 

  542. 		{"%v", float32(-1e-9), "-1e-09"},
    543. 

  543. 		{"%010v", 0.0, "0000000000"},
    544. 

  544. 		{"%010v", 0.0, "0000000000"},
    545. 

  545. 

  546. 		// *Float cases
    547. 

  547. 		{"%.20f", "1e-20", "0.00000000000000000001"},
    548. 

  548. 		{"%.20f", "-1e-20", "-0.00000000000000000001"},
    549. 

  549. 		{"%30.20f", "-1e-20", "       -0.00000000000000000001"},
    550. 

  550. 		{"%030.20f", "-1e-20", "-00000000.00000000000000000001"},
    551. 

  551. 		{"%030.20f", "+1e-20", "000000000.00000000000000000001"},
    552. 

  552. 		{"% 030.20f", "+1e-20", " 00000000.00000000000000000001"},
    553. 

  553. 

  554. 		// erroneous formats
    555. 

  555. 		{"%s", 1.0, "%!s(*big.Float=1)"},
    556. 

  556. 	} {
    557. 

  557. 		value := new(Float)
    558. 

  558. 		switch v := test.value.(type) {
    559. 

  559. 		case float32:
    560. 

  560. 			value.SetPrec(24).SetFloat64(float64(v))
    561. 

  561. 		case float64:
    562. 

  562. 			value.SetPrec(53).SetFloat64(v)
    563. 

  563. 		case string:
    564. 

  564. 			value.SetPrec(512).Parse(v, 0)
    565. 

  565. 		default:
    566. 

  566. 			t.Fatalf("unsupported test value: %v (%T)", v, v)
    567. 

  567. 		}
    568. 

  568. 

  569. 		if got := fmt.Sprintf(test.format, value); got != test.want {
    570. 

  570. 			t.Errorf("%v: got %q; want %q", test, got, test.want)
    571. 

  571. 		}
    572. 

  572. 	}
    573. 

  573. }
    574. 

  574.