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examples_test.go
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examples_test.go
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package jsontemplate_test
import (
"os"
"strings"
"github.com/Volumental/jsontemplate"
)
// Store example from JSONPath.
const Input = `
{
"store": {
"book": [
{
"category": "reference",
"author": "Nigel Rees",
"title": "Sayings of the Century",
"price": 8.95
},
{
"category": "fiction",
"author": "Evelyn Waugh",
"title": "Sword of Honour",
"price": 12.99
},
{
"category": "fiction",
"author": "Herman Melville",
"title": "Moby Dick",
"isbn": "0-553-21311-3",
"price": 8.99
},
{
"category": "fiction",
"author": "J. R. R. Tolkien",
"title": "The Lord of the Rings",
"isbn": "0-395-19395-8",
"price": 22.99
}
],
"bicycle": {
"color": "red",
"price": 19.95
}
}
}
`
const Template = `
{
# Pick an invidual field.
"bicycle_color": $.store.bicycle.color,
"book_info": {
# Slice an array, taking the first three elements.
"top_three": $.store.book[:3],
# Map a list of objects.
"price_list": range $.store.book[*] [
{
"title": $.title,
"price": $.price,
}
],
},
# Calculate the average of all price fields.
"avg_price": Avg($..price),
}
`
// Helper function we'll use in the template.
func Avg(values []interface{}) float64 {
var sum = 0.0
var cnt = 0
for _, val := range values {
if num, ok := val.(float64); ok {
sum += num
cnt += 1
}
}
return sum / float64(cnt)
}
func Example() {
var funcs = jsontemplate.FunctionMap{"Avg": Avg}
var template, _ = jsontemplate.ParseString(Template, funcs)
template.RenderJSON(os.Stdout, strings.NewReader(Input))
os.Stdout.Sync()
// Output: {"avg_price":14.774000000000001,"bicycle_color":"red","book_info":{"price_list":[{"price":8.95,"title":"Sayings of the Century"},{"price":12.99,"title":"Sword of Honour"},{"price":8.99,"title":"Moby Dick"},{"price":22.99,"title":"The Lord of the Rings"}],"top_three":[{"author":"Nigel Rees","category":"reference","price":8.95,"title":"Sayings of the Century"},{"author":"Evelyn Waugh","category":"fiction","price":12.99,"title":"Sword of Honour"},{"author":"Herman Melville","category":"fiction","isbn":"0-553-21311-3","price":8.99,"title":"Moby Dick"}]}}
}