91 lines
2.1 KiB
Markdown
91 lines
2.1 KiB
Markdown
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# Python's repr() for Go [](http://godoc.org/github.com/alecthomas/repr) [](https://travis-ci.org/alecthomas/repr)
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This package attempts to represent Go values in a form that can be used almost directly in Go source
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code.
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Unfortunately, some values (such as pointers to basic types) can not be represented directly in Go.
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These values will be represented as `&<value>`. eg. `&23`
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## Example
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```go
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type test struct {
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S string
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I int
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A []int
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}
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func main() {
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repr.Print(&test{
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S: "String",
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I: 123,
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A: []int{1, 2, 3},
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})
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}
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```
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Outputs
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```
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&main.test{S: "String", I: 123, A: []int{1, 2, 3}}
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```
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## Why repr and not [pp](https://github.com/k0kubun/pp)?
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pp is designed for printing coloured output to consoles, with (seemingly?) no way to disable this. If you don't want coloured output (eg. for use in diffs, logs, etc.) repr is for you.
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## Why repr and not [go-spew](https://github.com/davecgh/go-spew)?
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Repr deliberately contains much less metadata about values. It is designed to (generally) be copyable directly into source code.
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Compare go-spew:
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```go
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(parser.expression) (len=1 cap=1) {
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(parser.alternative) (len=1 cap=1) {
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([]interface {}) (len=1 cap=1) {
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(*parser.repitition)(0xc82000b220)({
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expression: (parser.expression) (len=2 cap=2) {
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(parser.alternative) (len=1 cap=1) {
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([]interface {}) (len=1 cap=1) {
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(parser.str) (len=1) "a"
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}
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},
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(parser.alternative) (len=1 cap=1) {
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([]interface {}) (len=1 cap=1) {
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(*parser.self)(0x593ef0)({
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})
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}
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}
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}
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})
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}
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}
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}
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```
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To repr:
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```go
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parser.expression{
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parser.alternative{
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[]interface {}{
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&parser.repitition{
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expression: parser.expression{
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parser.alternative{
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[]interface {}{
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parser.str("a"),
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},
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},
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parser.alternative{
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[]interface {}{
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&parser.self{ },
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},
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},
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},
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},
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},
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},
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}
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```
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