mirror of
https://github.com/kemko/nomad.git
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15fb4c990a
This PR switches the Nomad repository from using govendor to Go modules for managing dependencies. Aspects of the Nomad workflow remain pretty much the same. The usual Makefile targets should continue to work as they always did. The API submodule simply defers to the parent Nomad version on the repository, keeping the semantics of API versioning that currently exists.
100 lines
2.5 KiB
Go
100 lines
2.5 KiB
Go
// Copyright 2017, The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE.md file.
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// Package function provides functionality for identifying function types.
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package function
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import (
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"reflect"
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"regexp"
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"runtime"
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"strings"
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)
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type funcType int
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const (
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_ funcType = iota
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tbFunc // func(T) bool
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ttbFunc // func(T, T) bool
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trbFunc // func(T, R) bool
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tibFunc // func(T, I) bool
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trFunc // func(T) R
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Equal = ttbFunc // func(T, T) bool
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EqualAssignable = tibFunc // func(T, I) bool; encapsulates func(T, T) bool
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Transformer = trFunc // func(T) R
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ValueFilter = ttbFunc // func(T, T) bool
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Less = ttbFunc // func(T, T) bool
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ValuePredicate = tbFunc // func(T) bool
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KeyValuePredicate = trbFunc // func(T, R) bool
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)
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var boolType = reflect.TypeOf(true)
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// IsType reports whether the reflect.Type is of the specified function type.
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func IsType(t reflect.Type, ft funcType) bool {
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if t == nil || t.Kind() != reflect.Func || t.IsVariadic() {
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return false
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}
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ni, no := t.NumIn(), t.NumOut()
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switch ft {
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case tbFunc: // func(T) bool
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if ni == 1 && no == 1 && t.Out(0) == boolType {
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return true
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}
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case ttbFunc: // func(T, T) bool
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if ni == 2 && no == 1 && t.In(0) == t.In(1) && t.Out(0) == boolType {
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return true
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}
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case trbFunc: // func(T, R) bool
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if ni == 2 && no == 1 && t.Out(0) == boolType {
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return true
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}
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case tibFunc: // func(T, I) bool
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if ni == 2 && no == 1 && t.In(0).AssignableTo(t.In(1)) && t.Out(0) == boolType {
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return true
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}
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case trFunc: // func(T) R
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if ni == 1 && no == 1 {
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return true
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}
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}
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return false
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}
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var lastIdentRx = regexp.MustCompile(`[_\p{L}][_\p{L}\p{N}]*$`)
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// NameOf returns the name of the function value.
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func NameOf(v reflect.Value) string {
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fnc := runtime.FuncForPC(v.Pointer())
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if fnc == nil {
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return "<unknown>"
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}
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fullName := fnc.Name() // e.g., "long/path/name/mypkg.(*MyType).(long/path/name/mypkg.myMethod)-fm"
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// Method closures have a "-fm" suffix.
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fullName = strings.TrimSuffix(fullName, "-fm")
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var name string
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for len(fullName) > 0 {
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inParen := strings.HasSuffix(fullName, ")")
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fullName = strings.TrimSuffix(fullName, ")")
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s := lastIdentRx.FindString(fullName)
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if s == "" {
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break
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}
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name = s + "." + name
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fullName = strings.TrimSuffix(fullName, s)
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if i := strings.LastIndexByte(fullName, '('); inParen && i >= 0 {
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fullName = fullName[:i]
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}
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fullName = strings.TrimSuffix(fullName, ".")
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}
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return strings.TrimSuffix(name, ".")
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}
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