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// Copyright 2015 Aaron Jacobs. All Rights Reserved.
// Author: aaronjjacobs@gmail.com (Aaron Jacobs)
//
// 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 generate
import (
"fmt"
"log"
"reflect"
"strings"
)
// Return the string that should be used to refer to the supplied type within
// the given package. The output is not guaranteed to be pretty, and should be
// run through a tool like gofmt afterward.
//
// For example, a pointer to an io.Reader may be rendered as "*Reader" or
// "*io.Reader" depending on whether the package path is "io" or not.
func typeString(
t reflect.Type,
pkgPath string) (s string) {
// Is this type named? If so we use its name, possibly with a package prefix.
//
// Examples:
//
// int
// string
// error
// gcs.Bucket
//
if t.Name() != "" {
if t.PkgPath() == pkgPath {
s = t.Name()
} else {
s = t.String()
}
return
}
// This type is unnamed. Recurse.
switch t.Kind() {
case reflect.Array:
s = fmt.Sprintf("[%d]%s", t.Len(), typeString(t.Elem(), pkgPath))
case reflect.Chan:
s = fmt.Sprintf("%s %s", t.ChanDir(), typeString(t.Elem(), pkgPath))
case reflect.Func:
s = typeString_Func(t, pkgPath)
case reflect.Interface:
s = typeString_Interface(t, pkgPath)
case reflect.Map:
s = fmt.Sprintf(
"map[%s]%s",
typeString(t.Key(), pkgPath),
typeString(t.Elem(), pkgPath))
case reflect.Ptr:
s = fmt.Sprintf("*%s", typeString(t.Elem(), pkgPath))
case reflect.Slice:
s = fmt.Sprintf("[]%s", typeString(t.Elem(), pkgPath))
case reflect.Struct:
s = typeString_Struct(t, pkgPath)
default:
log.Panicf("Unhandled kind %v for type: %v", t.Kind(), t)
}
return
}
func typeString_FuncOrMethod(
name string,
t reflect.Type,
pkgPath string) (s string) {
// Deal with input types.
var in []string
for i := 0; i < t.NumIn(); i++ {
in = append(in, typeString(t.In(i), pkgPath))
}
// And output types.
var out []string
for i := 0; i < t.NumOut(); i++ {
out = append(out, typeString(t.Out(i), pkgPath))
}
// Put it all together.
s = fmt.Sprintf(
"%s(%s) (%s)",
name,
strings.Join(in, ", "),
strings.Join(out, ", "))
return
}
func typeString_Func(
t reflect.Type,
pkgPath string) (s string) {
return typeString_FuncOrMethod("func", t, pkgPath)
}
func typeString_Struct(
t reflect.Type,
pkgPath string) (s string) {
var fields []string
for i := 0; i < t.NumField(); i++ {
f := t.Field(i)
fString := fmt.Sprintf("%s %s", f.Name, typeString(f.Type, pkgPath))
fields = append(fields, fString)
}
s = fmt.Sprintf("struct { %s }", strings.Join(fields, "; "))
return
}
func typeString_Interface(
t reflect.Type,
pkgPath string) (s string) {
var methods []string
for i := 0; i < t.NumMethod(); i++ {
m := t.Method(i)
mString := typeString_FuncOrMethod(m.Name, m.Type, pkgPath)
methods = append(methods, mString)
}
s = fmt.Sprintf("interface { %s }", strings.Join(methods, "; "))
return
}
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