wartank/vendor/modernc.org/regexp/etc.go

// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the GO-LICENSE file.

package regexp // modernc.org/regexp

import (
	"fmt"
	"os"
	"path/filepath"
	"runtime"
	"runtime/debug"
	"strings"
)

// origin returns caller's short position, skipping skip frames.
func origin(skip int) string {
	pc, fn, fl, _ := runtime.Caller(skip)
	f := runtime.FuncForPC(pc)
	var fns string
	if f != nil {
		fns = f.Name()
		if x := strings.LastIndex(fns, "."); x > 0 {
			fns = fns[x+1:]
		}
		if strings.HasPrefix(fns, "func") {
			num := true
			for _, c := range fns[len("func"):] {
				if c < '0' || c > '9' {
					num = false
					break
				}
			}
			if num {
				return origin(skip + 2)
			}
		}
	}
	return fmt.Sprintf("%s:%d:%s", filepath.Base(fn), fl, fns)
}

// todo prints and returns caller's position and an optional message tagged with TODO. Output goes to stderr.
//
//lint:ignore U1000 debug helper
func todo(s string, args ...interface{}) string {
	switch {
	case s == "":
		s = fmt.Sprintf(strings.Repeat("%v ", len(args)), args...)
	default:
		s = fmt.Sprintf(s, args...)
	}
	s = fmt.Sprintf("%s\n\tTODO %s", origin(2), s)
	// fmt.Fprintf(os.Stderr, "%s\n", s)
	// os.Stdout.Sync()
	return s
}

// trc prints and returns caller's position and an optional message tagged with TRC. Output goes to stderr.
//
//lint:ignore U1000 debug helper
func trc(s string, args ...interface{}) string {
	switch {
	case s == "":
		s = fmt.Sprintf(strings.Repeat("%v ", len(args)), args...)
	default:
		s = fmt.Sprintf(s, args...)
	}
	s = fmt.Sprintf("%s: TRC %s", origin(2), s)
	fmt.Fprintf(os.Stderr, "%s\n", s)
	os.Stderr.Sync()
	return s
}

//lint:ignore U1000 debug helper
func stack() []byte { return debug.Stack() }