/
template.go
192 lines (159 loc) · 4.43 KB
/
template.go
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package generator
import (
"bytes"
"fmt"
"go/build"
"io"
"os"
"path/filepath"
"reflect"
"strings"
"text/template"
"golang.org/x/tools/imports"
)
type Template struct {
template *template.Template
}
type TemplateData struct {
*Package
Fields []*TemplateField
Processed map[interface{}]string
}
type TemplateField struct {
Name string
Path string
Fields interface{}
}
func (tf *TemplateField) ValidFields() []*Field {
return tf.Fields.([]*Field)
}
func (t *Template) Execute(wr io.Writer, data *Package) error {
var buf bytes.Buffer
td := &TemplateData{data, []*TemplateField{}, map[interface{}]string{}}
err := t.template.Execute(&buf, td)
if err != nil {
return err
}
return prettyfy(buf.Bytes(), wr)
}
func (td *TemplateData) GenType(vi interface{}, path string) string {
v := reflect.ValueOf(vi)
sv := v
if v.Kind() == reflect.Ptr {
sv = v.Elem()
}
if sv.FieldByName("Type").Interface().(string) == "struct" {
if v.MethodByName("ValidFields").IsValid() {
return td.LinkStruct(path, vi)
}
return ""
} else {
k := "Field"
if v.MethodByName("ContainsMap").Call(nil)[0].Interface().(bool) {
k = "Map"
}
return fmt.Sprintf("%v storable.%v", sv.FieldByName("Name"), k)
}
}
func (td *TemplateData) LinkStruct(path string, vi interface{}) string {
v := reflect.ValueOf(vi)
name := v.Elem().FieldByName("Name").Interface().(string)
schemaName := "schema" + path + name
if proc, ok := td.Processed[vi]; ok {
schemaName = proc
return name + " *" + schemaName
}
td.Processed[vi] = schemaName
td.Fields = append(td.Fields, &TemplateField{
Name: schemaName,
Path: path + name,
Fields: v.MethodByName("ValidFields").Call(nil)[0].Interface(),
})
return name + " *" + schemaName
}
func (td *TemplateData) GenVar(vi interface{}, done map[interface{}]bool) string {
if done == nil {
done = map[interface{}]bool{}
}
v := reflect.ValueOf(vi)
sv := v
if v.Kind() == reflect.Ptr {
sv = v.Elem()
}
if done[vi] {
return sv.FieldByName("Name").Interface().(string) + ": nil,"
}
if sv.FieldByName("Type").Interface().(string) == "struct" {
if v.MethodByName("ValidFields").IsValid() {
return td.StructValue(vi, done)
}
return ""
} else {
k := "NewField"
if v.MethodByName("ContainsMap").Call(nil)[0].Interface().(bool) {
k = "NewMap"
}
return fmt.Sprintf(
`%v: storable.%v("%v", "%v"),`,
sv.FieldByName("Name"),
k,
v.MethodByName("GetPath").Call(nil)[0],
v.MethodByName("FindableType").Call(nil)[0],
)
}
}
func (td *TemplateData) StructValue(vi interface{}, done map[interface{}]bool) string {
v := reflect.ValueOf(vi)
name := v.Elem().FieldByName("Name").Interface().(string)
ifc := v.Interface()
if done[ifc] {
return name + ": nil,"
}
done[ifc] = true
ret := name + ": &" + td.Processed[vi] + "{"
for _, v := range v.MethodByName("ValidFields").Call(nil)[0].Interface().([]*Field) {
ret += "\n" + td.GenVar(v, done)
}
ret += "\n},"
return ret
}
func prettyfy(input []byte, wr io.Writer) error {
output, err := imports.Process("storable.go", input, nil)
if err != nil {
printDocumentWithNumbers(string(input))
return err
}
_, err = wr.Write(output)
return err
}
func printDocumentWithNumbers(code string) {
for i, line := range strings.Split(code, "\n") {
fmt.Printf("%.3d %s\n", i+1, line)
}
}
func loadTemplateText(filename string) string {
filename = filepath.Join(build.Default.GOPATH, "src/gopkg.in/src-d/storable.v1/generator", filename)
f, err := os.Open(filename)
if err != nil {
panic(err)
}
buf := bytes.NewBuffer(nil)
if _, err := buf.ReadFrom(f); err != nil {
panic(err)
}
return strings.Replace(buf.String(), "\\\n", " ", -1)
}
func makeTemplate(name string, filename string) *template.Template {
text := loadTemplateText(filename)
return template.Must(template.New(name).Parse(text))
}
func addTemplate(base *template.Template, name string, filename string) *template.Template {
text := loadTemplateText(filename)
return template.Must(base.New(name).Parse(text))
}
var base *template.Template = makeTemplate("base", "templates/base.tgo")
var schema *template.Template = addTemplate(base, "schema", "templates/schema.tgo")
var model *template.Template = addTemplate(base, "model", "templates/model.tgo")
var query *template.Template = addTemplate(model, "query", "templates/query.tgo")
var resultset *template.Template = addTemplate(model, "resultset", "templates/resultset.tgo")
var Base *Template = &Template{template: base}