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9035f7aea5
Runtime doing its own number formatting dates back to when runtime was the bottom-most Go package. Those days are long gone. Use internal/strconv to avoid duplicating code and also to get better floating-point formatting: % go1.24.6 run x.go +1.234568e+004 % go run x.go 12345.678 % With accurate floating point it becomes necessary to introduce separate printers for float32 vs float64 and for complex64 vs complex128. Otherwise float32(93.7) prints as 93.69999694824219. Change-Id: I25ae3f09519342dc3d1dcabf4711651423e00128 Reviewed-on: https://go-review.googlesource.com/c/go/+/716002 Reviewed-by: David Chase <drchase@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
100 lines
2.3 KiB
Go
100 lines
2.3 KiB
Go
// run
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//go:build !nacl && !js && !wasip1 && !gccgo
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// Copyright 2017 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// ensure that panic(x) where x is a numeric type displays a readable number
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package main
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import (
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"bytes"
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"fmt"
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"io/ioutil"
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"log"
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"os"
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"os/exec"
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"path/filepath"
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)
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const fn = `
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package main
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import "errors"
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type S struct {
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}
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func (s S) String() string {
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return "s-stringer"
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}
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func main() {
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_ = errors.New
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panic(%s(%s))
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}
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`
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func main() {
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tempDir, err := ioutil.TempDir("", "")
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if err != nil {
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log.Fatal(err)
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}
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defer os.RemoveAll(tempDir)
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tmpFile := filepath.Join(tempDir, "tmp.go")
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for _, tc := range []struct {
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Type string
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Input string
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Expect string
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}{
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{"", "nil", "panic: panic called with nil argument"},
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{"errors.New", `"test"`, "panic: test"},
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{"S", "S{}", "panic: s-stringer"},
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{"byte", "8", "panic: 8"},
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{"rune", "8", "panic: 8"},
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{"int", "8", "panic: 8"},
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{"int8", "8", "panic: 8"},
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{"int16", "8", "panic: 8"},
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{"int32", "8", "panic: 8"},
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{"int64", "8", "panic: 8"},
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{"uint", "8", "panic: 8"},
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{"uint8", "8", "panic: 8"},
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{"uint16", "8", "panic: 8"},
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{"uint32", "8", "panic: 8"},
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{"uint64", "8", "panic: 8"},
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{"uintptr", "8", "panic: 8"},
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{"bool", "true", "panic: true"},
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{"complex64", "8 + 16i", "panic: (8+16i)"},
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{"complex128", "8+16i", "panic: (8+16i)"},
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{"string", `"test"`, "panic: test"}} {
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b := bytes.Buffer{}
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fmt.Fprintf(&b, fn, tc.Type, tc.Input)
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err = ioutil.WriteFile(tmpFile, b.Bytes(), 0644)
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if err != nil {
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log.Fatal(err)
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}
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cmd := exec.Command("go", "run", tmpFile)
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var buf bytes.Buffer
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cmd.Stdout = &buf
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cmd.Stderr = &buf
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cmd.Env = os.Environ()
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cmd.Run() // ignore err as we expect a panic
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out := buf.Bytes()
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panicIdx := bytes.Index(out, []byte("panic: "))
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if panicIdx == -1 {
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log.Fatalf("expected a panic in output for %s, got: %s", tc.Type, out)
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}
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eolIdx := bytes.IndexByte(out[panicIdx:], '\n') + panicIdx
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if panicIdx == -1 {
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log.Fatalf("expected a newline in output for %s after the panic, got: %s", tc.Type, out)
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}
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out = out[0:eolIdx]
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if string(out) != tc.Expect {
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log.Fatalf("expected '%s' for panic(%s(%s)), got %s", tc.Expect, tc.Type, tc.Input, out)
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}
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}
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}
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