45 lines
1.1 KiB
Go
45 lines
1.1 KiB
Go
package parsekit
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import (
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"fmt"
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"runtime"
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"strings"
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)
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// Error is used as the error type when parsing errors occur.
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// The error includes some context information to allow for useful
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// error messages to the user.
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type Error struct {
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Message string
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Cursor Cursor
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}
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func (err *Error) Error() string {
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if err == nil {
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callerPanic(1, "parsekit.Error.Error(): method called with nil error at {caller}")
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}
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return fmt.Sprintf("%s at %s", err.Message, err.Cursor)
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}
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func callerFunc(depth int) string {
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// No error handling, because we call this method ourselves with safe depth values.
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pc, _, _, _ := runtime.Caller(depth + 1)
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caller := runtime.FuncForPC(pc)
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parts := strings.Split(caller.Name(), ".")
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funcName := parts[len(parts)-1]
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return funcName
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}
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func callerFilepos(depth int) string {
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// No error handling, because we call this method ourselves with safe depth values.
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_, file, line, _ := runtime.Caller(depth + 1)
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return fmt.Sprintf("%s:%d", file, line)
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}
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func callerPanic(depth int, f string, args ...interface{}) {
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filepos := callerFilepos(depth + 1)
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m := fmt.Sprintf(f, args...)
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m = strings.Replace(m, "{caller}", filepos, 1)
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panic(m)
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}
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