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example_test.go
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example_test.go
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// Copyright 2017 Santhosh Kumar Tekuri. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package xpath_test
import (
"encoding/xml"
"fmt"
"strings"
"github.com/santhosh-tekuri/dom"
"github.com/santhosh-tekuri/xpath"
)
func Example() {
str := `
<developer>
<name>Santhosh Kumar Tekuri</name>
<email>[email protected]</email>
</developer>
`
doc, err := dom.Unmarshal(xml.NewDecoder(strings.NewReader(str)))
if err != nil {
fmt.Println(err)
return
}
expr, err := new(xpath.Compiler).Compile("/developer/name")
if err != nil {
fmt.Println(err)
return
}
fmt.Printf("xpath %v returns value of type %v\n", expr, expr.Returns())
result, err := expr.EvalString(doc, nil)
if err != nil {
fmt.Println(err)
return
}
fmt.Printf("Result: %s", result)
// Output:
// xpath /developer/name returns value of type node-set
// Result: Santhosh Kumar Tekuri
}
func ExampleVariableMap() {
uri := "www.jroller.com/santhosh/"
compiler := &xpath.Compiler{
Namespaces: map[string]string{
"ns": uri,
},
}
expr, err := compiler.Compile("$v1 + $v2 * $ns:v3 - $ns:v4")
if err != nil {
fmt.Println(err)
return
}
fmt.Printf("xpath %v returns value of type %v\n", expr, expr.Returns())
result, err := expr.EvalNumber(nil, xpath.VariableMap{
"v1": float64(2),
"v2": float64(3),
"{www.jroller.com/santhosh/}v3": float64(4),
xpath.ClarkName(uri, "v4"): float64(1),
})
if err != nil {
fmt.Println(err)
return
}
fmt.Printf("Result: %.2f", result)
// Output:
// xpath $v1 + $v2 * $ns:v3 - $ns:v4 returns value of type number
// Result: 13.00
}
func ExampleFunctionMap() {
join := func(args []interface{}) interface{} {
sep := args[0].(string)
var a []string
for _, v := range args[1:] {
a = append(a, v.(string))
}
return strings.Join(a, sep)
}
uri := "www.jroller.com/santhosh/"
compiler := &xpath.Compiler{
Namespaces: map[string]string{
"x": uri,
},
Functions: xpath.FunctionMap{
"{www.jroller.com/santhosh/}join": &xpath.Function{
Returns: xpath.String,
Args: xpath.Args{
xpath.Mandatory(xpath.String),
xpath.Variadic(xpath.String),
},
Compile: xpath.CompileFunc(join),
},
},
}
expr, err := compiler.Compile("x:join(':', 'one', 'two', 'three')")
if err != nil {
fmt.Println(err)
return
}
fmt.Printf("xpath %v returns value of type %v\n", expr, expr.Returns())
result, err := expr.EvalString(nil, nil)
if err != nil {
fmt.Println(err)
return
}
fmt.Printf("Result: %s", result)
// Output:
// xpath x:join(':', 'one', 'two', 'three') returns value of type string
// Result: one:two:three
}