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45 lines
1.2 KiB
Go
45 lines
1.2 KiB
Go
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// Copyright © 2016 Alan A. A. Donovan & Brian W. Kernighan.
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// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
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// See page 332.
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// Package format provides an Any function that can format any value.
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//!+
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package format
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import (
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"reflect"
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"strconv"
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)
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// Any formats any value as a string.
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func Any(value interface{}) string {
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return formatAtom(reflect.ValueOf(value))
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}
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// formatAtom formats a value without inspecting its internal structure.
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func formatAtom(v reflect.Value) string {
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switch v.Kind() {
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case reflect.Invalid:
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return "invalid"
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case reflect.Int, reflect.Int8, reflect.Int16,
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reflect.Int32, reflect.Int64:
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return strconv.FormatInt(v.Int(), 10)
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case reflect.Uint, reflect.Uint8, reflect.Uint16,
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reflect.Uint32, reflect.Uint64, reflect.Uintptr:
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return strconv.FormatUint(v.Uint(), 10)
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// ...floating-point and complex cases omitted for brevity...
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case reflect.Bool:
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return strconv.FormatBool(v.Bool())
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case reflect.String:
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return strconv.Quote(v.String())
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case reflect.Chan, reflect.Func, reflect.Ptr, reflect.Slice, reflect.Map:
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return v.Type().String() + " 0x" +
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strconv.FormatUint(uint64(v.Pointer()), 16)
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default: // reflect.Array, reflect.Struct, reflect.Interface
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return v.Type().String() + " value"
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}
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}
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//!-
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