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vendor go-querystring

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Elliott Stoneham 2016-06-01 16:22:14 +01:00
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*.test

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# How to contribute #
We'd love to accept your patches and contributions to this project. There are
a just a few small guidelines you need to follow.
## Contributor License Agreement ##
Contributions to any Google project must be accompanied by a Contributor
License Agreement. This is not a copyright **assignment**, it simply gives
Google permission to use and redistribute your contributions as part of the
project.
* If you are an individual writing original source code and you're sure you
own the intellectual property, then you'll need to sign an [individual
CLA][].
* If you work for a company that wants to allow you to contribute your work,
then you'll need to sign a [corporate CLA][].
You generally only need to submit a CLA once, so if you've already submitted
one (even if it was for a different project), you probably don't need to do it
again.
[individual CLA]: https://developers.google.com/open-source/cla/individual
[corporate CLA]: https://developers.google.com/open-source/cla/corporate
## Submitting a patch ##
1. It's generally best to start by opening a new issue describing the bug or
feature you're intending to fix. Even if you think it's relatively minor,
it's helpful to know what people are working on. Mention in the initial
issue that you are planning to work on that bug or feature so that it can
be assigned to you.
1. Follow the normal process of [forking][] the project, and setup a new
branch to work in. It's important that each group of changes be done in
separate branches in order to ensure that a pull request only includes the
commits related to that bug or feature.
1. Go makes it very simple to ensure properly formatted code, so always run
`go fmt` on your code before committing it. You should also run
[golint][] over your code. As noted in the [golint readme][], it's not
strictly necessary that your code be completely "lint-free", but this will
help you find common style issues.
1. Any significant changes should almost always be accompanied by tests. The
project already has good test coverage, so look at some of the existing
tests if you're unsure how to go about it. [gocov][] and [gocov-html][]
are invaluable tools for seeing which parts of your code aren't being
exercised by your tests.
1. Do your best to have [well-formed commit messages][] for each change.
This provides consistency throughout the project, and ensures that commit
messages are able to be formatted properly by various git tools.
1. Finally, push the commits to your fork and submit a [pull request][].
[forking]: https://help.github.com/articles/fork-a-repo
[golint]: https://github.com/golang/lint
[golint readme]: https://github.com/golang/lint/blob/master/README
[gocov]: https://github.com/axw/gocov
[gocov-html]: https://github.com/matm/gocov-html
[well-formed commit messages]: http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html
[squash]: http://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits
[pull request]: https://help.github.com/articles/creating-a-pull-request

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Copyright (c) 2013 Google. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
* Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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# go-querystring #
go-querystring is Go library for encoding structs into URL query parameters.
**Documentation:** <http://godoc.org/github.com/google/go-querystring/query>
**Build Status:** [![Build Status](https://drone.io/github.com/google/go-querystring/status.png)](https://drone.io/github.com/google/go-querystring/latest)
## Usage ##
```go
import "github.com/google/go-querystring/query"
```
go-querystring is designed to assist in scenarios where you want to construct a
URL using a struct that represents the URL query parameters. You might do this
to enforce the type safety of your parameters, for example, as is done in the
[go-github][] library.
The query package exports a single `Values()` function. A simple example:
```go
type Options struct {
Query string `url:"q"`
ShowAll bool `url:"all"`
Page int `url:"page"`
}
opt := Options{ "foo", true, 2 }
v, _ := query.Values(opt)
fmt.Print(v.Encode()) // will output: "q=foo&all=true&page=2"
```
[go-github]: https://github.com/google/go-github/commit/994f6f8405f052a117d2d0b500054341048fbb08
## License ##
This library is distributed under the BSD-style license found in the [LICENSE](./LICENSE)
file.

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// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package query implements encoding of structs into URL query parameters.
//
// As a simple example:
//
// type Options struct {
// Query string `url:"q"`
// ShowAll bool `url:"all"`
// Page int `url:"page"`
// }
//
// opt := Options{ "foo", true, 2 }
// v, _ := query.Values(opt)
// fmt.Print(v.Encode()) // will output: "q=foo&all=true&page=2"
//
// The exact mapping between Go values and url.Values is described in the
// documentation for the Values() function.
package query
import (
"bytes"
"fmt"
"net/url"
"reflect"
"strconv"
"strings"
"time"
)
var timeType = reflect.TypeOf(time.Time{})
var encoderType = reflect.TypeOf(new(Encoder)).Elem()
// Encoder is an interface implemented by any type that wishes to encode
// itself into URL values in a non-standard way.
type Encoder interface {
EncodeValues(key string, v *url.Values) error
}
// Values returns the url.Values encoding of v.
//
// Values expects to be passed a struct, and traverses it recursively using the
// following encoding rules.
//
// Each exported struct field is encoded as a URL parameter unless
//
// - the field's tag is "-", or
// - the field is empty and its tag specifies the "omitempty" option
//
// The empty values are false, 0, any nil pointer or interface value, any array
// slice, map, or string of length zero, and any time.Time that returns true
// for IsZero().
//
// The URL parameter name defaults to the struct field name but can be
// specified in the struct field's tag value. The "url" key in the struct
// field's tag value is the key name, followed by an optional comma and
// options. For example:
//
// // Field is ignored by this package.
// Field int `url:"-"`
//
// // Field appears as URL parameter "myName".
// Field int `url:"myName"`
//
// // Field appears as URL parameter "myName" and the field is omitted if
// // its value is empty
// Field int `url:"myName,omitempty"`
//
// // Field appears as URL parameter "Field" (the default), but the field
// // is skipped if empty. Note the leading comma.
// Field int `url:",omitempty"`
//
// For encoding individual field values, the following type-dependent rules
// apply:
//
// Boolean values default to encoding as the strings "true" or "false".
// Including the "int" option signals that the field should be encoded as the
// strings "1" or "0".
//
// time.Time values default to encoding as RFC3339 timestamps. Including the
// "unix" option signals that the field should be encoded as a Unix time (see
// time.Unix())
//
// Slice and Array values default to encoding as multiple URL values of the
// same name. Including the "comma" option signals that the field should be
// encoded as a single comma-delimited value. Including the "space" option
// similarly encodes the value as a single space-delimited string. Including
// the "semicolon" option will encode the value as a semicolon-delimited string.
// Including the "brackets" option signals that the multiple URL values should
// have "[]" appended to the value name. "numbered" will append a number to
// the end of each incidence of the value name, example:
// name0=value0&name1=value1, etc.
//
// Anonymous struct fields are usually encoded as if their inner exported
// fields were fields in the outer struct, subject to the standard Go
// visibility rules. An anonymous struct field with a name given in its URL
// tag is treated as having that name, rather than being anonymous.
//
// Non-nil pointer values are encoded as the value pointed to.
//
// Nested structs are encoded including parent fields in value names for
// scoping. e.g:
//
// "user[name]=acme&user[addr][postcode]=1234&user[addr][city]=SFO"
//
// All other values are encoded using their default string representation.
//
// Multiple fields that encode to the same URL parameter name will be included
// as multiple URL values of the same name.
func Values(v interface{}) (url.Values, error) {
values := make(url.Values)
val := reflect.ValueOf(v)
for val.Kind() == reflect.Ptr {
if val.IsNil() {
return values, nil
}
val = val.Elem()
}
if v == nil {
return values, nil
}
if val.Kind() != reflect.Struct {
return nil, fmt.Errorf("query: Values() expects struct input. Got %v", val.Kind())
}
err := reflectValue(values, val, "")
return values, err
}
// reflectValue populates the values parameter from the struct fields in val.
// Embedded structs are followed recursively (using the rules defined in the
// Values function documentation) breadth-first.
func reflectValue(values url.Values, val reflect.Value, scope string) error {
var embedded []reflect.Value
typ := val.Type()
for i := 0; i < typ.NumField(); i++ {
sf := typ.Field(i)
if sf.PkgPath != "" && !sf.Anonymous { // unexported
continue
}
sv := val.Field(i)
tag := sf.Tag.Get("url")
if tag == "-" {
continue
}
name, opts := parseTag(tag)
if name == "" {
if sf.Anonymous && sv.Kind() == reflect.Struct {
// save embedded struct for later processing
embedded = append(embedded, sv)
continue
}
name = sf.Name
}
if scope != "" {
name = scope + "[" + name + "]"
}
if opts.Contains("omitempty") && isEmptyValue(sv) {
continue
}
if sv.Type().Implements(encoderType) {
if !reflect.Indirect(sv).IsValid() {
sv = reflect.New(sv.Type().Elem())
}
m := sv.Interface().(Encoder)
if err := m.EncodeValues(name, &values); err != nil {
return err
}
continue
}
if sv.Kind() == reflect.Slice || sv.Kind() == reflect.Array {
var del byte
if opts.Contains("comma") {
del = ','
} else if opts.Contains("space") {
del = ' '
} else if opts.Contains("semicolon") {
del = ';'
} else if opts.Contains("brackets") {
name = name + "[]"
}
if del != 0 {
s := new(bytes.Buffer)
first := true
for i := 0; i < sv.Len(); i++ {
if first {
first = false
} else {
s.WriteByte(del)
}
s.WriteString(valueString(sv.Index(i), opts))
}
values.Add(name, s.String())
} else {
for i := 0; i < sv.Len(); i++ {
k := name
if opts.Contains("numbered") {
k = fmt.Sprintf("%s%d", name, i)
}
values.Add(k, valueString(sv.Index(i), opts))
}
}
continue
}
if sv.Type() == timeType {
values.Add(name, valueString(sv, opts))
continue
}
for sv.Kind() == reflect.Ptr {
if sv.IsNil() {
break
}
sv = sv.Elem()
}
if sv.Kind() == reflect.Struct {
reflectValue(values, sv, name)
continue
}
values.Add(name, valueString(sv, opts))
}
for _, f := range embedded {
if err := reflectValue(values, f, scope); err != nil {
return err
}
}
return nil
}
// valueString returns the string representation of a value.
func valueString(v reflect.Value, opts tagOptions) string {
for v.Kind() == reflect.Ptr {
if v.IsNil() {
return ""
}
v = v.Elem()
}
if v.Kind() == reflect.Bool && opts.Contains("int") {
if v.Bool() {
return "1"
}
return "0"
}
if v.Type() == timeType {
t := v.Interface().(time.Time)
if opts.Contains("unix") {
return strconv.FormatInt(t.Unix(), 10)
}
return t.Format(time.RFC3339)
}
return fmt.Sprint(v.Interface())
}
// isEmptyValue checks if a value should be considered empty for the purposes
// of omitting fields with the "omitempty" option.
func isEmptyValue(v reflect.Value) bool {
switch v.Kind() {
case reflect.Array, reflect.Map, reflect.Slice, reflect.String:
return v.Len() == 0
case reflect.Bool:
return !v.Bool()
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return v.Int() == 0
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return v.Uint() == 0
case reflect.Float32, reflect.Float64:
return v.Float() == 0
case reflect.Interface, reflect.Ptr:
return v.IsNil()
}
if v.Type() == timeType {
return v.Interface().(time.Time).IsZero()
}
return false
}
// tagOptions is the string following a comma in a struct field's "url" tag, or
// the empty string. It does not include the leading comma.
type tagOptions []string
// parseTag splits a struct field's url tag into its name and comma-separated
// options.
func parseTag(tag string) (string, tagOptions) {
s := strings.Split(tag, ",")
return s[0], s[1:]
}
// Contains checks whether the tagOptions contains the specified option.
func (o tagOptions) Contains(option string) bool {
for _, s := range o {
if s == option {
return true
}
}
return false
}

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// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package query
import (
"fmt"
"net/url"
"reflect"
"testing"
"time"
)
type Nested struct {
A SubNested `url:"a"`
B *SubNested `url:"b"`
Ptr *SubNested `url:"ptr,omitempty"`
}
type SubNested struct {
Value string `url:"value"`
}
func TestValues_types(t *testing.T) {
str := "string"
strPtr := &str
tests := []struct {
in interface{}
want url.Values
}{
{
// basic primitives
struct {
A string
B int
C uint
D float32
E bool
}{},
url.Values{
"A": {""},
"B": {"0"},
"C": {"0"},
"D": {"0"},
"E": {"false"},
},
},
{
// pointers
struct {
A *string
B *int
C **string
}{A: strPtr, C: &strPtr},
url.Values{
"A": {str},
"B": {""},
"C": {str},
},
},
{
// slices and arrays
struct {
A []string
B []string `url:",comma"`
C []string `url:",space"`
D [2]string
E [2]string `url:",comma"`
F [2]string `url:",space"`
G []*string `url:",space"`
H []bool `url:",int,space"`
I []string `url:",brackets"`
J []string `url:",semicolon"`
K []string `url:",numbered"`
}{
A: []string{"a", "b"},
B: []string{"a", "b"},
C: []string{"a", "b"},
D: [2]string{"a", "b"},
E: [2]string{"a", "b"},
F: [2]string{"a", "b"},
G: []*string{&str, &str},
H: []bool{true, false},
I: []string{"a", "b"},
J: []string{"a", "b"},
K: []string{"a", "b"},
},
url.Values{
"A": {"a", "b"},
"B": {"a,b"},
"C": {"a b"},
"D": {"a", "b"},
"E": {"a,b"},
"F": {"a b"},
"G": {"string string"},
"H": {"1 0"},
"I[]": {"a", "b"},
"J": {"a;b"},
"K0": {"a"},
"K1": {"b"},
},
},
{
// other types
struct {
A time.Time
B time.Time `url:",unix"`
C bool `url:",int"`
D bool `url:",int"`
}{
A: time.Date(2000, 1, 1, 12, 34, 56, 0, time.UTC),
B: time.Date(2000, 1, 1, 12, 34, 56, 0, time.UTC),
C: true,
D: false,
},
url.Values{
"A": {"2000-01-01T12:34:56Z"},
"B": {"946730096"},
"C": {"1"},
"D": {"0"},
},
},
{
struct {
Nest Nested `url:"nest"`
}{
Nested{
A: SubNested{
Value: "that",
},
},
},
url.Values{
"nest[a][value]": {"that"},
"nest[b]": {""},
},
},
{
struct {
Nest Nested `url:"nest"`
}{
Nested{
Ptr: &SubNested{
Value: "that",
},
},
},
url.Values{
"nest[a][value]": {""},
"nest[b]": {""},
"nest[ptr][value]": {"that"},
},
},
{
nil,
url.Values{},
},
}
for i, tt := range tests {
v, err := Values(tt.in)
if err != nil {
t.Errorf("%d. Values(%q) returned error: %v", i, tt.in, err)
}
if !reflect.DeepEqual(tt.want, v) {
t.Errorf("%d. Values(%q) returned %v, want %v", i, tt.in, v, tt.want)
}
}
}
func TestValues_omitEmpty(t *testing.T) {
str := ""
s := struct {
a string
A string
B string `url:",omitempty"`
C string `url:"-"`
D string `url:"omitempty"` // actually named omitempty, not an option
E *string `url:",omitempty"`
}{E: &str}
v, err := Values(s)
if err != nil {
t.Errorf("Values(%q) returned error: %v", s, err)
}
want := url.Values{
"A": {""},
"omitempty": {""},
"E": {""}, // E is included because the pointer is not empty, even though the string being pointed to is
}
if !reflect.DeepEqual(want, v) {
t.Errorf("Values(%q) returned %v, want %v", s, v, want)
}
}
type A struct {
B
}
type B struct {
C string
}
type D struct {
B
C string
}
type e struct {
B
C string
}
type F struct {
e
}
func TestValues_embeddedStructs(t *testing.T) {
tests := []struct {
in interface{}
want url.Values
}{
{
A{B{C: "foo"}},
url.Values{"C": {"foo"}},
},
{
D{B: B{C: "bar"}, C: "foo"},
url.Values{"C": {"foo", "bar"}},
},
{
F{e{B: B{C: "bar"}, C: "foo"}}, // With unexported embed
url.Values{"C": {"foo", "bar"}},
},
}
for i, tt := range tests {
v, err := Values(tt.in)
if err != nil {
t.Errorf("%d. Values(%q) returned error: %v", i, tt.in, err)
}
if !reflect.DeepEqual(tt.want, v) {
t.Errorf("%d. Values(%q) returned %v, want %v", i, tt.in, v, tt.want)
}
}
}
func TestValues_invalidInput(t *testing.T) {
_, err := Values("")
if err == nil {
t.Errorf("expected Values() to return an error on invalid input")
}
}
type EncodedArgs []string
func (m EncodedArgs) EncodeValues(key string, v *url.Values) error {
for i, arg := range m {
v.Set(fmt.Sprintf("%s.%d", key, i), arg)
}
return nil
}
func TestValues_Marshaler(t *testing.T) {
s := struct {
Args EncodedArgs `url:"arg"`
}{[]string{"a", "b", "c"}}
v, err := Values(s)
if err != nil {
t.Errorf("Values(%q) returned error: %v", s, err)
}
want := url.Values{
"arg.0": {"a"},
"arg.1": {"b"},
"arg.2": {"c"},
}
if !reflect.DeepEqual(want, v) {
t.Errorf("Values(%q) returned %v, want %v", s, v, want)
}
}
func TestValues_MarshalerWithNilPointer(t *testing.T) {
s := struct {
Args *EncodedArgs `url:"arg"`
}{}
v, err := Values(s)
if err != nil {
t.Errorf("Values(%q) returned error: %v", s, err)
}
want := url.Values{}
if !reflect.DeepEqual(want, v) {
t.Errorf("Values(%q) returned %v, want %v", s, v, want)
}
}
func TestTagParsing(t *testing.T) {
name, opts := parseTag("field,foobar,foo")
if name != "field" {
t.Fatalf("name = %q, want field", name)
}
for _, tt := range []struct {
opt string
want bool
}{
{"foobar", true},
{"foo", true},
{"bar", false},
{"field", false},
} {
if opts.Contains(tt.opt) != tt.want {
t.Errorf("Contains(%q) = %v", tt.opt, !tt.want)
}
}
}