1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557
|
// Copyright 2011 Aaron Jacobs. All Rights Reserved.
// Author: aaronjjacobs@gmail.com (Aaron Jacobs)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package oglematchers
import (
"errors"
"fmt"
"math"
"reflect"
)
// Equals(x) returns a matcher that matches values v such that v and x are
// equivalent. This includes the case when the comparison v == x using Go's
// built-in comparison operator is legal (except for structs, which this
// matcher does not support), but for convenience the following rules also
// apply:
//
// * Type checking is done based on underlying types rather than actual
// types, so that e.g. two aliases for string can be compared:
//
// type stringAlias1 string
// type stringAlias2 string
//
// a := "taco"
// b := stringAlias1("taco")
// c := stringAlias2("taco")
//
// ExpectTrue(a == b) // Legal, passes
// ExpectTrue(b == c) // Illegal, doesn't compile
//
// ExpectThat(a, Equals(b)) // Passes
// ExpectThat(b, Equals(c)) // Passes
//
// * Values of numeric type are treated as if they were abstract numbers, and
// compared accordingly. Therefore Equals(17) will match int(17),
// int16(17), uint(17), float32(17), complex64(17), and so on.
//
// If you want a stricter matcher that contains no such cleverness, see
// IdenticalTo instead.
//
// Arrays are supported by this matcher, but do not participate in the
// exceptions above. Two arrays compared with this matcher must have identical
// types, and their element type must itself be comparable according to Go's ==
// operator.
func Equals(x interface{}) Matcher {
v := reflect.ValueOf(x)
// This matcher doesn't support structs.
if v.Kind() == reflect.Struct {
panic(fmt.Sprintf("oglematchers.Equals: unsupported kind %v", v.Kind()))
}
// The == operator is not defined for non-nil slices.
if v.Kind() == reflect.Slice && v.Pointer() != uintptr(0) {
panic(fmt.Sprintf("oglematchers.Equals: non-nil slice"))
}
return &equalsMatcher{v}
}
type equalsMatcher struct {
expectedValue reflect.Value
}
////////////////////////////////////////////////////////////////////////
// Numeric types
////////////////////////////////////////////////////////////////////////
func isSignedInteger(v reflect.Value) bool {
k := v.Kind()
return k >= reflect.Int && k <= reflect.Int64
}
func isUnsignedInteger(v reflect.Value) bool {
k := v.Kind()
return k >= reflect.Uint && k <= reflect.Uint64
}
func isInteger(v reflect.Value) bool {
return isSignedInteger(v) || isUnsignedInteger(v)
}
func isFloat(v reflect.Value) bool {
k := v.Kind()
return k == reflect.Float32 || k == reflect.Float64
}
func isComplex(v reflect.Value) bool {
k := v.Kind()
return k == reflect.Complex64 || k == reflect.Complex128
}
func checkAgainstInt64(e int64, c reflect.Value) (err error) {
err = errors.New("")
switch {
case isSignedInteger(c):
if c.Int() == e {
err = nil
}
case isUnsignedInteger(c):
u := c.Uint()
if u <= math.MaxInt64 && int64(u) == e {
err = nil
}
// Turn around the various floating point types so that the checkAgainst*
// functions for them can deal with precision issues.
case isFloat(c), isComplex(c):
return Equals(c.Interface()).Matches(e)
default:
err = NewFatalError("which is not numeric")
}
return
}
func checkAgainstUint64(e uint64, c reflect.Value) (err error) {
err = errors.New("")
switch {
case isSignedInteger(c):
i := c.Int()
if i >= 0 && uint64(i) == e {
err = nil
}
case isUnsignedInteger(c):
if c.Uint() == e {
err = nil
}
// Turn around the various floating point types so that the checkAgainst*
// functions for them can deal with precision issues.
case isFloat(c), isComplex(c):
return Equals(c.Interface()).Matches(e)
default:
err = NewFatalError("which is not numeric")
}
return
}
func checkAgainstFloat32(e float32, c reflect.Value) (err error) {
err = errors.New("")
switch {
case isSignedInteger(c):
if float32(c.Int()) == e {
err = nil
}
case isUnsignedInteger(c):
if float32(c.Uint()) == e {
err = nil
}
case isFloat(c):
// Compare using float32 to avoid a false sense of precision; otherwise
// e.g. Equals(float32(0.1)) won't match float32(0.1).
if float32(c.Float()) == e {
err = nil
}
case isComplex(c):
comp := c.Complex()
rl := real(comp)
im := imag(comp)
// Compare using float32 to avoid a false sense of precision; otherwise
// e.g. Equals(float32(0.1)) won't match (0.1 + 0i).
if im == 0 && float32(rl) == e {
err = nil
}
default:
err = NewFatalError("which is not numeric")
}
return
}
func checkAgainstFloat64(e float64, c reflect.Value) (err error) {
err = errors.New("")
ck := c.Kind()
switch {
case isSignedInteger(c):
if float64(c.Int()) == e {
err = nil
}
case isUnsignedInteger(c):
if float64(c.Uint()) == e {
err = nil
}
// If the actual value is lower precision, turn the comparison around so we
// apply the low-precision rules. Otherwise, e.g. Equals(0.1) may not match
// float32(0.1).
case ck == reflect.Float32 || ck == reflect.Complex64:
return Equals(c.Interface()).Matches(e)
// Otherwise, compare with double precision.
case isFloat(c):
if c.Float() == e {
err = nil
}
case isComplex(c):
comp := c.Complex()
rl := real(comp)
im := imag(comp)
if im == 0 && rl == e {
err = nil
}
default:
err = NewFatalError("which is not numeric")
}
return
}
func checkAgainstComplex64(e complex64, c reflect.Value) (err error) {
err = errors.New("")
realPart := real(e)
imaginaryPart := imag(e)
switch {
case isInteger(c) || isFloat(c):
// If we have no imaginary part, then we should just compare against the
// real part. Otherwise, we can't be equal.
if imaginaryPart != 0 {
return
}
return checkAgainstFloat32(realPart, c)
case isComplex(c):
// Compare using complex64 to avoid a false sense of precision; otherwise
// e.g. Equals(0.1 + 0i) won't match float32(0.1).
if complex64(c.Complex()) == e {
err = nil
}
default:
err = NewFatalError("which is not numeric")
}
return
}
func checkAgainstComplex128(e complex128, c reflect.Value) (err error) {
err = errors.New("")
realPart := real(e)
imaginaryPart := imag(e)
switch {
case isInteger(c) || isFloat(c):
// If we have no imaginary part, then we should just compare against the
// real part. Otherwise, we can't be equal.
if imaginaryPart != 0 {
return
}
return checkAgainstFloat64(realPart, c)
case isComplex(c):
if c.Complex() == e {
err = nil
}
default:
err = NewFatalError("which is not numeric")
}
return
}
////////////////////////////////////////////////////////////////////////
// Other types
////////////////////////////////////////////////////////////////////////
func checkAgainstBool(e bool, c reflect.Value) (err error) {
if c.Kind() != reflect.Bool {
err = NewFatalError("which is not a bool")
return
}
err = errors.New("")
if c.Bool() == e {
err = nil
}
return
}
func checkAgainstUintptr(e uintptr, c reflect.Value) (err error) {
if c.Kind() != reflect.Uintptr {
err = NewFatalError("which is not a uintptr")
return
}
err = errors.New("")
if uintptr(c.Uint()) == e {
err = nil
}
return
}
func checkAgainstChan(e reflect.Value, c reflect.Value) (err error) {
// Create a description of e's type, e.g. "chan int".
typeStr := fmt.Sprintf("%s %s", e.Type().ChanDir(), e.Type().Elem())
// Make sure c is a chan of the correct type.
if c.Kind() != reflect.Chan ||
c.Type().ChanDir() != e.Type().ChanDir() ||
c.Type().Elem() != e.Type().Elem() {
err = NewFatalError(fmt.Sprintf("which is not a %s", typeStr))
return
}
err = errors.New("")
if c.Pointer() == e.Pointer() {
err = nil
}
return
}
func checkAgainstFunc(e reflect.Value, c reflect.Value) (err error) {
// Make sure c is a function.
if c.Kind() != reflect.Func {
err = NewFatalError("which is not a function")
return
}
err = errors.New("")
if c.Pointer() == e.Pointer() {
err = nil
}
return
}
func checkAgainstMap(e reflect.Value, c reflect.Value) (err error) {
// Make sure c is a map.
if c.Kind() != reflect.Map {
err = NewFatalError("which is not a map")
return
}
err = errors.New("")
if c.Pointer() == e.Pointer() {
err = nil
}
return
}
func checkAgainstPtr(e reflect.Value, c reflect.Value) (err error) {
// Create a description of e's type, e.g. "*int".
typeStr := fmt.Sprintf("*%v", e.Type().Elem())
// Make sure c is a pointer of the correct type.
if c.Kind() != reflect.Ptr ||
c.Type().Elem() != e.Type().Elem() {
err = NewFatalError(fmt.Sprintf("which is not a %s", typeStr))
return
}
err = errors.New("")
if c.Pointer() == e.Pointer() {
err = nil
}
return
}
func checkAgainstSlice(e reflect.Value, c reflect.Value) (err error) {
// Create a description of e's type, e.g. "[]int".
typeStr := fmt.Sprintf("[]%v", e.Type().Elem())
// Make sure c is a slice of the correct type.
if c.Kind() != reflect.Slice ||
c.Type().Elem() != e.Type().Elem() {
err = NewFatalError(fmt.Sprintf("which is not a %s", typeStr))
return
}
err = errors.New("")
if c.Pointer() == e.Pointer() {
err = nil
}
return
}
func checkAgainstString(e reflect.Value, c reflect.Value) (err error) {
// Make sure c is a string.
if c.Kind() != reflect.String {
err = NewFatalError("which is not a string")
return
}
err = errors.New("")
if c.String() == e.String() {
err = nil
}
return
}
func checkAgainstArray(e reflect.Value, c reflect.Value) (err error) {
// Create a description of e's type, e.g. "[2]int".
typeStr := fmt.Sprintf("%v", e.Type())
// Make sure c is the correct type.
if c.Type() != e.Type() {
err = NewFatalError(fmt.Sprintf("which is not %s", typeStr))
return
}
// Check for equality.
if e.Interface() != c.Interface() {
err = errors.New("")
return
}
return
}
func checkAgainstUnsafePointer(e reflect.Value, c reflect.Value) (err error) {
// Make sure c is a pointer.
if c.Kind() != reflect.UnsafePointer {
err = NewFatalError("which is not a unsafe.Pointer")
return
}
err = errors.New("")
if c.Pointer() == e.Pointer() {
err = nil
}
return
}
func checkForNil(c reflect.Value) (err error) {
err = errors.New("")
// Make sure it is legal to call IsNil.
switch c.Kind() {
case reflect.Invalid:
case reflect.Chan:
case reflect.Func:
case reflect.Interface:
case reflect.Map:
case reflect.Ptr:
case reflect.Slice:
default:
err = NewFatalError("which cannot be compared to nil")
return
}
// Ask whether the value is nil. Handle a nil literal (kind Invalid)
// specially, since it's not legal to call IsNil there.
if c.Kind() == reflect.Invalid || c.IsNil() {
err = nil
}
return
}
////////////////////////////////////////////////////////////////////////
// Public implementation
////////////////////////////////////////////////////////////////////////
func (m *equalsMatcher) Matches(candidate interface{}) error {
e := m.expectedValue
c := reflect.ValueOf(candidate)
ek := e.Kind()
switch {
case ek == reflect.Bool:
return checkAgainstBool(e.Bool(), c)
case isSignedInteger(e):
return checkAgainstInt64(e.Int(), c)
case isUnsignedInteger(e):
return checkAgainstUint64(e.Uint(), c)
case ek == reflect.Uintptr:
return checkAgainstUintptr(uintptr(e.Uint()), c)
case ek == reflect.Float32:
return checkAgainstFloat32(float32(e.Float()), c)
case ek == reflect.Float64:
return checkAgainstFloat64(e.Float(), c)
case ek == reflect.Complex64:
return checkAgainstComplex64(complex64(e.Complex()), c)
case ek == reflect.Complex128:
return checkAgainstComplex128(complex128(e.Complex()), c)
case ek == reflect.Chan:
return checkAgainstChan(e, c)
case ek == reflect.Func:
return checkAgainstFunc(e, c)
case ek == reflect.Map:
return checkAgainstMap(e, c)
case ek == reflect.Ptr:
return checkAgainstPtr(e, c)
case ek == reflect.Slice:
return checkAgainstSlice(e, c)
case ek == reflect.String:
return checkAgainstString(e, c)
case ek == reflect.Array:
return checkAgainstArray(e, c)
case ek == reflect.UnsafePointer:
return checkAgainstUnsafePointer(e, c)
case ek == reflect.Invalid:
return checkForNil(c)
}
panic(fmt.Sprintf("equalsMatcher.Matches: unexpected kind: %v", ek))
}
func (m *equalsMatcher) Description() string {
// Special case: handle nil.
if !m.expectedValue.IsValid() {
return "is nil"
}
return fmt.Sprintf("%v", m.expectedValue.Interface())
}
|