empty arrays for non-existent values #11

This commit is contained in:
Josh Baker 2016-11-02 13:45:25 -07:00
parent 1584ec68ff
commit ac4cd1ab55
3 changed files with 29 additions and 6 deletions

View File

@ -76,6 +76,7 @@ The dot and wildcard characters can be escaped with '\'.
``` ```
"name.last" >> "Anderson" "name.last" >> "Anderson"
"age" >> 37 "age" >> 37
"children" >> ["Sara","Alex","Jack"]
"children.#" >> 3 "children.#" >> 3
"children.1" >> "Alex" "children.1" >> "Alex"
"child*.2" >> "Jack" "child*.2" >> "Jack"
@ -129,6 +130,12 @@ result.Get(path string) Result
The `result.Value()` function returns an `interface{}` which requires type assertion and is one of the following Go types: The `result.Value()` function returns an `interface{}` which requires type assertion and is one of the following Go types:
The `result.Array()` funtion returns back an array of values.
If the result represents a non-existent value, then an empty array will be returned.
If the result is not a JSON array, the return value will be an array containing one result.
```go ```go
boolean >> bool boolean >> bool
number >> float64 number >> float64

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@ -138,9 +138,13 @@ func (t Result) Float() float64 {
} }
} }
// Array returns back an array of children. If the result is not // Array returns back an array of values.
// a JSON array, the return will be an array containing one result. // If the result represents a non-existent value, then an empty array will be returned.
// If the result is not a JSON array, the return value will be an array containing one result.
func (t Result) Array() []Result { func (t Result) Array() []Result {
if !t.Exists() {
return nil
}
if t.Type != JSON { if t.Type != JSON {
return []Result{t} return []Result{t}
} }
@ -148,7 +152,7 @@ func (t Result) Array() []Result {
return r.a return r.a
} }
// Map returns back an map of children. The result should be a JSON array. // Map returns back an map of values. The result should be a JSON array.
func (t Result) Map() map[string]Result { func (t Result) Map() map[string]Result {
if t.Type != JSON { if t.Type != JSON {
return map[string]Result{} return map[string]Result{}
@ -1154,6 +1158,7 @@ type parseContext struct {
// } // }
// "name.last" >> "Anderson" // "name.last" >> "Anderson"
// "age" >> 37 // "age" >> 37
// "children" >> ["Sara","Alex","Jack"]
// "children.#" >> 3 // "children.#" >> 3
// "children.1" >> "Alex" // "children.1" >> "Alex"
// "child*.2" >> "Jack" // "child*.2" >> "Jack"

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@ -446,7 +446,7 @@ func TestUnmarshalMap(t *testing.T) {
} }
func TestSingleArrayValue(t *testing.T) { func TestSingleArrayValue(t *testing.T) {
var json = `{"key": "value"}` var json = `{"key": "value","key2":[1,2,3,4,"A"]}`
var result = Get(json, "key") var result = Get(json, "key")
var array = result.Array() var array = result.Array()
if len(array) != 1 { if len(array) != 1 {
@ -455,6 +455,17 @@ func TestSingleArrayValue(t *testing.T) {
if array[0].String() != "value" { if array[0].String() != "value" {
t.Fatal("got %s, should be %s", array[0].String(), "value") t.Fatal("got %s, should be %s", array[0].String(), "value")
} }
array = Get(json, "key2.#").Array()
if len(array) != 1 {
t.Fatal("got '%v', expected '%v'", len(array), 1)
}
array = Get(json, "key3").Array()
if len(array) != 0 {
t.Fatal("got '%v', expected '%v'", len(array), 0)
}
} }
type BenchStruct struct { type BenchStruct struct {