307 lines
12 KiB
Go
307 lines
12 KiB
Go
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/*
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* Copyright (c) 2013-2016 Dave Collins <dave@davec.name>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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package spew
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import (
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"bytes"
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"fmt"
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"io"
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"os"
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)
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// ConfigState houses the configuration options used by spew to format and
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// display values. There is a global instance, Config, that is used to control
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// all top-level Formatter and Dump functionality. Each ConfigState instance
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// provides methods equivalent to the top-level functions.
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//
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// The zero value for ConfigState provides no indentation. You would typically
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// want to set it to a space or a tab.
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//
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// Alternatively, you can use NewDefaultConfig to get a ConfigState instance
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// with default settings. See the documentation of NewDefaultConfig for default
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// values.
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type ConfigState struct {
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// Indent specifies the string to use for each indentation level. The
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// global config instance that all top-level functions use set this to a
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// single space by default. If you would like more indentation, you might
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// set this to a tab with "\t" or perhaps two spaces with " ".
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Indent string
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// MaxDepth controls the maximum number of levels to descend into nested
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// data structures. The default, 0, means there is no limit.
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//
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// NOTE: Circular data structures are properly detected, so it is not
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// necessary to set this value unless you specifically want to limit deeply
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// nested data structures.
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MaxDepth int
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// DisableMethods specifies whether or not error and Stringer interfaces are
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// invoked for types that implement them.
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DisableMethods bool
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// DisablePointerMethods specifies whether or not to check for and invoke
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// error and Stringer interfaces on types which only accept a pointer
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// receiver when the current type is not a pointer.
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//
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// NOTE: This might be an unsafe action since calling one of these methods
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// with a pointer receiver could technically mutate the value, however,
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// in practice, types which choose to satisify an error or Stringer
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// interface with a pointer receiver should not be mutating their state
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// inside these interface methods. As a result, this option relies on
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// access to the unsafe package, so it will not have any effect when
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// running in environments without access to the unsafe package such as
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// Google App Engine or with the "safe" build tag specified.
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DisablePointerMethods bool
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// DisablePointerAddresses specifies whether to disable the printing of
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// pointer addresses. This is useful when diffing data structures in tests.
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DisablePointerAddresses bool
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// DisableCapacities specifies whether to disable the printing of capacities
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// for arrays, slices, maps and channels. This is useful when diffing
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// data structures in tests.
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DisableCapacities bool
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// ContinueOnMethod specifies whether or not recursion should continue once
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// a custom error or Stringer interface is invoked. The default, false,
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// means it will print the results of invoking the custom error or Stringer
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// interface and return immediately instead of continuing to recurse into
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// the internals of the data type.
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//
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// NOTE: This flag does not have any effect if method invocation is disabled
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// via the DisableMethods or DisablePointerMethods options.
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ContinueOnMethod bool
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// SortKeys specifies map keys should be sorted before being printed. Use
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// this to have a more deterministic, diffable output. Note that only
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// native types (bool, int, uint, floats, uintptr and string) and types
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// that support the error or Stringer interfaces (if methods are
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// enabled) are supported, with other types sorted according to the
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// reflect.Value.String() output which guarantees display stability.
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SortKeys bool
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// SpewKeys specifies that, as a last resort attempt, map keys should
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// be spewed to strings and sorted by those strings. This is only
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// considered if SortKeys is true.
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SpewKeys bool
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}
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// Config is the active configuration of the top-level functions.
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// The configuration can be changed by modifying the contents of spew.Config.
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var Config = ConfigState{Indent: " "}
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// Errorf is a wrapper for fmt.Errorf that treats each argument as if it were
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// passed with a Formatter interface returned by c.NewFormatter. It returns
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// the formatted string as a value that satisfies error. See NewFormatter
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// for formatting details.
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//
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// This function is shorthand for the following syntax:
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//
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// fmt.Errorf(format, c.NewFormatter(a), c.NewFormatter(b))
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func (c *ConfigState) Errorf(format string, a ...interface{}) (err error) {
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return fmt.Errorf(format, c.convertArgs(a)...)
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}
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// Fprint is a wrapper for fmt.Fprint that treats each argument as if it were
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// passed with a Formatter interface returned by c.NewFormatter. It returns
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// the number of bytes written and any write error encountered. See
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// NewFormatter for formatting details.
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//
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// This function is shorthand for the following syntax:
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//
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// fmt.Fprint(w, c.NewFormatter(a), c.NewFormatter(b))
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func (c *ConfigState) Fprint(w io.Writer, a ...interface{}) (n int, err error) {
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return fmt.Fprint(w, c.convertArgs(a)...)
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}
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// Fprintf is a wrapper for fmt.Fprintf that treats each argument as if it were
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// passed with a Formatter interface returned by c.NewFormatter. It returns
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// the number of bytes written and any write error encountered. See
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// NewFormatter for formatting details.
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//
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// This function is shorthand for the following syntax:
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//
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// fmt.Fprintf(w, format, c.NewFormatter(a), c.NewFormatter(b))
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func (c *ConfigState) Fprintf(w io.Writer, format string, a ...interface{}) (n int, err error) {
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return fmt.Fprintf(w, format, c.convertArgs(a)...)
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}
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// Fprintln is a wrapper for fmt.Fprintln that treats each argument as if it
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// passed with a Formatter interface returned by c.NewFormatter. See
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// NewFormatter for formatting details.
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//
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// This function is shorthand for the following syntax:
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//
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// fmt.Fprintln(w, c.NewFormatter(a), c.NewFormatter(b))
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func (c *ConfigState) Fprintln(w io.Writer, a ...interface{}) (n int, err error) {
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return fmt.Fprintln(w, c.convertArgs(a)...)
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}
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// Print is a wrapper for fmt.Print that treats each argument as if it were
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// passed with a Formatter interface returned by c.NewFormatter. It returns
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// the number of bytes written and any write error encountered. See
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// NewFormatter for formatting details.
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//
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// This function is shorthand for the following syntax:
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//
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// fmt.Print(c.NewFormatter(a), c.NewFormatter(b))
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func (c *ConfigState) Print(a ...interface{}) (n int, err error) {
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return fmt.Print(c.convertArgs(a)...)
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}
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// Printf is a wrapper for fmt.Printf that treats each argument as if it were
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// passed with a Formatter interface returned by c.NewFormatter. It returns
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// the number of bytes written and any write error encountered. See
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// NewFormatter for formatting details.
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//
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// This function is shorthand for the following syntax:
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//
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// fmt.Printf(format, c.NewFormatter(a), c.NewFormatter(b))
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func (c *ConfigState) Printf(format string, a ...interface{}) (n int, err error) {
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return fmt.Printf(format, c.convertArgs(a)...)
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}
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// Println is a wrapper for fmt.Println that treats each argument as if it were
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// passed with a Formatter interface returned by c.NewFormatter. It returns
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// the number of bytes written and any write error encountered. See
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// NewFormatter for formatting details.
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//
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// This function is shorthand for the following syntax:
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//
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// fmt.Println(c.NewFormatter(a), c.NewFormatter(b))
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func (c *ConfigState) Println(a ...interface{}) (n int, err error) {
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return fmt.Println(c.convertArgs(a)...)
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}
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// Sprint is a wrapper for fmt.Sprint that treats each argument as if it were
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// passed with a Formatter interface returned by c.NewFormatter. It returns
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// the resulting string. See NewFormatter for formatting details.
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//
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// This function is shorthand for the following syntax:
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//
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// fmt.Sprint(c.NewFormatter(a), c.NewFormatter(b))
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func (c *ConfigState) Sprint(a ...interface{}) string {
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return fmt.Sprint(c.convertArgs(a)...)
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}
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// Sprintf is a wrapper for fmt.Sprintf that treats each argument as if it were
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// passed with a Formatter interface returned by c.NewFormatter. It returns
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// the resulting string. See NewFormatter for formatting details.
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//
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// This function is shorthand for the following syntax:
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//
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// fmt.Sprintf(format, c.NewFormatter(a), c.NewFormatter(b))
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func (c *ConfigState) Sprintf(format string, a ...interface{}) string {
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return fmt.Sprintf(format, c.convertArgs(a)...)
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}
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// Sprintln is a wrapper for fmt.Sprintln that treats each argument as if it
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// were passed with a Formatter interface returned by c.NewFormatter. It
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// returns the resulting string. See NewFormatter for formatting details.
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//
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// This function is shorthand for the following syntax:
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//
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// fmt.Sprintln(c.NewFormatter(a), c.NewFormatter(b))
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func (c *ConfigState) Sprintln(a ...interface{}) string {
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return fmt.Sprintln(c.convertArgs(a)...)
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}
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/*
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NewFormatter returns a custom formatter that satisfies the fmt.Formatter
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interface. As a result, it integrates cleanly with standard fmt package
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printing functions. The formatter is useful for inline printing of smaller data
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types similar to the standard %v format specifier.
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The custom formatter only responds to the %v (most compact), %+v (adds pointer
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addresses), %#v (adds types), and %#+v (adds types and pointer addresses) verb
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combinations. Any other verbs such as %x and %q will be sent to the the
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standard fmt package for formatting. In addition, the custom formatter ignores
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the width and precision arguments (however they will still work on the format
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specifiers not handled by the custom formatter).
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Typically this function shouldn't be called directly. It is much easier to make
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use of the custom formatter by calling one of the convenience functions such as
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c.Printf, c.Println, or c.Printf.
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*/
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func (c *ConfigState) NewFormatter(v interface{}) fmt.Formatter {
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return newFormatter(c, v)
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}
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// Fdump formats and displays the passed arguments to io.Writer w. It formats
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// exactly the same as Dump.
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func (c *ConfigState) Fdump(w io.Writer, a ...interface{}) {
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fdump(c, w, a...)
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}
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/*
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Dump displays the passed parameters to standard out with newlines, customizable
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indentation, and additional debug information such as complete types and all
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pointer addresses used to indirect to the final value. It provides the
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following features over the built-in printing facilities provided by the fmt
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package:
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* Pointers are dereferenced and followed
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* Circular data structures are detected and handled properly
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* Custom Stringer/error interfaces are optionally invoked, including
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on unexported types
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* Custom types which only implement the Stringer/error interfaces via
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a pointer receiver are optionally invoked when passing non-pointer
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variables
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* Byte arrays and slices are dumped like the hexdump -C command which
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includes offsets, byte values in hex, and ASCII output
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The configuration options are controlled by modifying the public members
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of c. See ConfigState for options documentation.
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See Fdump if you would prefer dumping to an arbitrary io.Writer or Sdump to
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get the formatted result as a string.
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*/
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func (c *ConfigState) Dump(a ...interface{}) {
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fdump(c, os.Stdout, a...)
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}
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// Sdump returns a string with the passed arguments formatted exactly the same
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// as Dump.
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func (c *ConfigState) Sdump(a ...interface{}) string {
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var buf bytes.Buffer
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fdump(c, &buf, a...)
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return buf.String()
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}
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// convertArgs accepts a slice of arguments and returns a slice of the same
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// length with each argument converted to a spew Formatter interface using
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// the ConfigState associated with s.
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func (c *ConfigState) convertArgs(args []interface{}) (formatters []interface{}) {
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formatters = make([]interface{}, len(args))
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for index, arg := range args {
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formatters[index] = newFormatter(c, arg)
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}
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return formatters
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}
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// NewDefaultConfig returns a ConfigState with the following default settings.
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//
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// Indent: " "
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// MaxDepth: 0
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// DisableMethods: false
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// DisablePointerMethods: false
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// ContinueOnMethod: false
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// SortKeys: false
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func NewDefaultConfig() *ConfigState {
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return &ConfigState{Indent: " "}
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}
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