fn.go

// Copyright 2018 The go-ego Project Developers.
//
// Licensed under the Apache License, Version 2.0 (the "License"): you may
// not use this file except in compliance with the License. You may obtain
// a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations
// under the License.

package tt

import (
	"fmt"
	"runtime"
	"strings"
	"unicode"
	"unicode/utf8"
)

// Blue returns a blue string
func Blue(message string) string {
	return fmt.Sprintf("\x1b[34m%s\x1b[0m", message)
}

// Red returns a red string
func Red(message string) string {
	return fmt.Sprintf("\x1b[31m%s\x1b[0m", message)
}

// Yellow returns a yellow string
func Yellow(message string) string {
	return fmt.Sprintf("\x1b[33m%s\x1b[0m", message)
}

// Bold returns a blod string
func Bold(message string) string {
	return fmt.Sprintf("\x1b[1m%s\x1b[21m", message)
}

// RedBold returns a red bold string
func RedBold(message string) string {
	return fmt.Sprintf("\x1b[31m%s\x1b[0m", Bold(message))
}

func isTest(name, prefix string) bool {
	if !strings.HasPrefix(name, prefix) {
		return false
	}
	if len(name) == len(prefix) { // "Test" is ok
		return true
	}
	rune, _ := utf8.DecodeRuneInString(name[len(prefix):])
	return !unicode.IsLower(rune)
}

// CallerInfo returns an array of strings containing the file and line number,
// and each stack frame leading from the current test, when the assert call that
// failed.
func CallerInfo() (callers []string) {
	var (
		pc         uintptr
		file, name string
		line       int
		ok         bool
	)

	for i := 0; ; i++ {
		pc, file, line, ok = runtime.Caller(i)
		if !ok {
			// The breaks below failed to terminate the loop, and we ran off the
			// end of the call stack.
			break
		}

		// This is a huge edge case, but it will panic if this is the case, see #180
		if file == "<autogenerated>" {
			break
		}

		f := runtime.FuncForPC(pc)
		if f == nil {
			break
		}
		name = f.Name()

		// testing.tRunner is the standard library function that calls
		// tests.
		if name == "testing.tRunner" {
			break
		}

		parts := strings.Split(file, "/")
		file = parts[len(parts)-1]
		if len(parts) > 1 {
			dir := parts[len(parts)-2]
			if (dir != "assert" && dir != "mock" && dir != "require") ||
				file == "mock_test.go" {
				callers = append(callers, fmt.Sprintf("%s:%d", file, line))
			}
		}

		// Drop the package
		segments := strings.Split(name, ".")
		name = segments[len(segments)-1]
		if isTest(name, "Test") ||
			isTest(name, "Benchmark") ||
			isTest(name, "Example") {
			break
		}
	}

	return
}