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components.go
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/
components.go
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package funcs
import (
"bytes"
"fmt"
"html"
"html/template"
"strings"
"github.com/golang/protobuf/jsonpb"
"github.com/golang/protobuf/proto"
)
type ComponentInstance struct {
name string
params []*ComponentInstanceParam
}
type ComponentInstanceParam struct {
name string
value interface{}
}
func Component(name string) *ComponentInstance {
return &ComponentInstance{name: name}
}
func EndComponent(c *ComponentInstance) (template.HTML, error) {
var buf bytes.Buffer
fmt.Fprintf(&buf, `<div data-vue="%s"`, c.name)
for _, param := range c.params {
switch v := param.value.(type) {
case proto.Message:
m := jsonpb.Marshaler{EmitDefaults: true}
b, err := m.MarshalToString(v)
if err != nil {
return template.HTML(""), fmt.Errorf("templates: cannot marshal component param %s: %s", c.name, err)
}
param.name = fmt.Sprintf("$%v", param.name)
param.value = html.EscapeString(b)
case bool, int32, int, float64:
param.name = fmt.Sprintf("$%v", param.name)
case string:
param.value = html.EscapeString(v)
case int64:
param.value = fmt.Sprintf("%v", v)
case []int32:
var s []string
for _, n := range v {
s = append(s, fmt.Sprintf("%d", n))
}
param.name = fmt.Sprintf("$%v", param.name)
param.value = fmt.Sprintf("[%s]", strings.Join(s, ","))
}
fmt.Fprintf(&buf, ` data-%v="%v"`, param.name, param.value)
}
fmt.Fprintf(&buf, `></div>`)
return template.HTML(buf.String()), nil
}
func ComponentParam(c *ComponentInstance, name string, value interface{}) string {
c.params = append(c.params, &ComponentInstanceParam{name, value})
return ""
}