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Introduce Stacktrace and Frame #37
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davecheney
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This PR is a continuation of a series aimed at exposing the stack trace information embedded in each error value. The secondary effect is to deprecated the `Fprintf` helper. Taking cues from from @ChrisHines' `stack` package this PR introduces a new interface `Stacktrace() []Frame` and a `Frame` type, similar in function to the `runtime.Frame` type (although lacking its iterator type). Each `Frame` implemnts `fmt.Formatter` allowing it to print itself. The older `Location` interface is still supported but also deprecated.
stack.go
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| fmt.Fprintf(s, "%d", f.line()) | ||
| case 'n': | ||
| name := runtime.FuncForPC(f.pc()).Name() | ||
| i := strings.LastIndex(name, ".") |
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Note that for a method name will look like package-path.type-name.method-name. Using LastIndex(name, ".") excludes the type-name, which would be ambiguous when many methods have the same name. That is why the stack package finds the first . after the last /.
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Thanks. I cheated there. I'll try to write a test case and fix this.
- Handle possible nil in `runtime.FuncForPC` - Refactor trimGOPATH to work on strings, not funcs and pc's - Fix incorrect handling of `%n` for methods.
This was referenced Jun 7, 2016
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This PR is a continuation of a series aimed at exposing the stack trace
information embedded in each error value. The secondary effect is to
deprecated the
Fprintfhelper.Taking cues from from @ChrisHines'
stackpackage this PR introduces anew interface
Stacktrace() []Frameand aFrametype, similar infunction to the
runtime.Frametype (although lacking its iteratortype). Each
Frameimplemntsfmt.Formatterallowing it to printitself.
The older
Locationinterface is still supported but also deprecated.