github.com/xushiwei/go@v0.0.0-20130601165731-2b9d83f45bc9/src/cmd/vet/test_print.go (about) 1 // 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 // +build vet_test 6 7 // This file contains tests for the printf checker. 8 9 package main 10 11 import ( 12 "fmt" 13 "unsafe" // just for test case printing unsafe.Pointer 14 ) 15 16 func UnsafePointerPrintfTest() { 17 var up unsafe.Pointer 18 fmt.Printf("%p, %x %X", up, up, up) 19 } 20 21 // Error methods that do not satisfy the Error interface and should be checked. 22 type errorTest1 int 23 24 func (errorTest1) Error(...interface{}) string { 25 return "hi" 26 } 27 28 type errorTest2 int // Analogous to testing's *T type. 29 func (errorTest2) Error(...interface{}) { 30 } 31 32 type errorTest3 int 33 34 func (errorTest3) Error() { // No return value. 35 } 36 37 type errorTest4 int 38 39 func (errorTest4) Error() int { // Different return type. 40 return 3 41 } 42 43 type errorTest5 int 44 45 func (errorTest5) error() { // niladic; don't complain if no args (was bug) 46 } 47 48 // This function never executes, but it serves as a simple test for the program. 49 // Test with make test. 50 func PrintfTests() { 51 var b bool 52 var i int 53 var r rune 54 var s string 55 var x float64 56 var p *int 57 // Some good format/argtypes 58 fmt.Printf("") 59 fmt.Printf("%b %b", 3, i) 60 fmt.Printf("%c %c %c %c", 3, i, 'x', r) 61 fmt.Printf("%d %d", 3, i) 62 fmt.Printf("%e %e", 3e9, x) 63 fmt.Printf("%E %E", 3e9, x) 64 fmt.Printf("%f %f", 3e9, x) 65 fmt.Printf("%F %F", 3e9, x) 66 fmt.Printf("%g %g", 3e9, x) 67 fmt.Printf("%G %G", 3e9, x) 68 fmt.Printf("%o %o", 3, i) 69 fmt.Printf("%p %p", p, nil) 70 fmt.Printf("%q %q %q %q", 3, i, 'x', r) 71 fmt.Printf("%s %s", "hi", s) 72 fmt.Printf("%t %t", true, b) 73 fmt.Printf("%T %T", 3, i) 74 fmt.Printf("%U %U", 3, i) 75 fmt.Printf("%v %v", 3, i) 76 fmt.Printf("%x %x %x %x", 3, i, "hi", s) 77 fmt.Printf("%X %X %X %X", 3, i, "hi", s) 78 fmt.Printf("%.*s %d %g", 3, "hi", 23, 2.3) 79 // Some bad format/argTypes 80 fmt.Printf("%b", "hi") // ERROR "arg .hi. for printf verb %b of wrong type" 81 fmt.Printf("%c", 2.3) // ERROR "arg 2.3 for printf verb %c of wrong type" 82 fmt.Printf("%d", 2.3) // ERROR "arg 2.3 for printf verb %d of wrong type" 83 fmt.Printf("%e", "hi") // ERROR "arg .hi. for printf verb %e of wrong type" 84 fmt.Printf("%E", true) // ERROR "arg true for printf verb %E of wrong type" 85 fmt.Printf("%f", "hi") // ERROR "arg .hi. for printf verb %f of wrong type" 86 fmt.Printf("%F", 'x') // ERROR "arg 'x' for printf verb %F of wrong type" 87 fmt.Printf("%g", "hi") // ERROR "arg .hi. for printf verb %g of wrong type" 88 fmt.Printf("%G", i) // ERROR "arg i for printf verb %G of wrong type" 89 fmt.Printf("%o", x) // ERROR "arg x for printf verb %o of wrong type" 90 fmt.Printf("%p", 23) // ERROR "arg 23 for printf verb %p of wrong type" 91 fmt.Printf("%q", x) // ERROR "arg x for printf verb %q of wrong type" 92 fmt.Printf("%s", b) // ERROR "arg b for printf verb %s of wrong type" 93 fmt.Printf("%t", 23) // ERROR "arg 23 for printf verb %t of wrong type" 94 fmt.Printf("%U", x) // ERROR "arg x for printf verb %U of wrong type" 95 fmt.Printf("%x", nil) // ERROR "arg nil for printf verb %x of wrong type" 96 fmt.Printf("%X", 2.3) // ERROR "arg 2.3 for printf verb %X of wrong type" 97 fmt.Printf("%.*s %d %g", 3, "hi", 23, 'x') // ERROR "arg 'x' for printf verb %g of wrong type" 98 // TODO 99 fmt.Println() // not an error 100 fmt.Println("%s", "hi") // ERROR "possible formatting directive in Println call" 101 fmt.Printf("%s", "hi", 3) // ERROR "wrong number of args for format in Printf call" 102 fmt.Printf("%"+("s"), "hi", 3) // ERROR "wrong number of args for format in Printf call" 103 fmt.Printf("%s%%%d", "hi", 3) // correct 104 fmt.Printf("%08s", "woo") // correct 105 fmt.Printf("% 8s", "woo") // correct 106 fmt.Printf("%.*d", 3, 3) // correct 107 fmt.Printf("%.*d", 3, 3, 3) // ERROR "wrong number of args for format in Printf call" 108 fmt.Printf("%.*d", "hi", 3) // ERROR "arg .hi. for \* in printf format not of type int" 109 fmt.Printf("%.*d", i, 3) // correct 110 fmt.Printf("%.*d", s, 3) // ERROR "arg s for \* in printf format not of type int" 111 fmt.Printf("%q %q", multi()...) // ok 112 fmt.Printf("%#q", `blah`) // ok 113 printf("now is the time", "buddy") // ERROR "no formatting directive" 114 Printf("now is the time", "buddy") // ERROR "no formatting directive" 115 Printf("hi") // ok 116 const format = "%s %s\n" 117 Printf(format, "hi", "there") 118 Printf(format, "hi") // ERROR "wrong number of args for format in Printf call" 119 f := new(File) 120 f.Warn(0, "%s", "hello", 3) // ERROR "possible formatting directive in Warn call" 121 f.Warnf(0, "%s", "hello", 3) // ERROR "wrong number of args for format in Warnf call" 122 f.Warnf(0, "%r", "hello") // ERROR "unrecognized printf verb" 123 f.Warnf(0, "%#s", "hello") // ERROR "unrecognized printf flag" 124 // Something that satisfies the error interface. 125 var e error 126 fmt.Println(e.Error()) // ok 127 // Something that looks like an error interface but isn't, such as the (*T).Error method 128 // in the testing package. 129 var et1 errorTest1 130 fmt.Println(et1.Error()) // ERROR "no args in Error call" 131 fmt.Println(et1.Error("hi")) // ok 132 fmt.Println(et1.Error("%d", 3)) // ERROR "possible formatting directive in Error call" 133 var et2 errorTest2 134 et2.Error() // ERROR "no args in Error call" 135 et2.Error("hi") // ok, not an error method. 136 et2.Error("%d", 3) // ERROR "possible formatting directive in Error call" 137 var et3 errorTest3 138 et3.Error() // ok, not an error method. 139 var et4 errorTest4 140 et4.Error() // ok, not an error method. 141 var et5 errorTest5 142 et5.error() // ok, not an error method. 143 } 144 145 // printf is used by the test. 146 func printf(format string, args ...interface{}) { 147 panic("don't call - testing only") 148 } 149 150 // multi is used by the test. 151 func multi() []interface{} { 152 panic("don't call - testing only") 153 }