/
parse.go
181 lines (155 loc) · 3.84 KB
/
parse.go
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package generate
import (
"fmt"
"go/ast"
"go/token"
"go/types"
"strings"
)
const FACTOR3_ANNOTATION_PREFIX = "//factor3:"
const FACTOR3_ANNOTATION_PREFIX_GENERATE = FACTOR3_ANNOTATION_PREFIX + "generate "
const FACTOR3_ANNOTATION_PREFIX_PFLAG = FACTOR3_ANNOTATION_PREFIX + "pflag "
func (a *App) parseType(ut *UnparsedType) (Type, error) {
var t Type
t.name = ut.name
t.pkgName = ut.object.Pkg().Name()
t.annotations = ut.annotations
t.doc = ut.doc
ti := a.pkgs[ut.pkgID].TypesInfo.Types[ut.astTypeSpec.Type]
switch uti := ti.Type.Underlying().(type) {
case *types.Struct:
for i := 0; i < uti.NumFields(); i++ {
var (
fieldAnnotations []string
fieldDocs string
)
field := uti.Field(i)
if !field.Exported() {
continue
}
ast.Inspect(ut.astTypeSpec, func(node ast.Node) bool {
if node == nil {
return true
}
switch n := node.(type) {
case *ast.Field:
if n.Doc == nil {
return true
}
var found bool
for _, nameIdent := range n.Names {
if nameIdent.Name == field.Name() {
found = true
break
}
}
if !found {
return true
}
if n.Doc != nil {
for _, c := range n.Doc.List {
trimmed := strings.TrimSpace(c.Text)
if strings.HasPrefix(trimmed, FACTOR3_ANNOTATION_PREFIX) {
fieldAnnotations = append(fieldAnnotations, trimmed)
}
}
fieldDocs = n.Doc.Text()
}
return false
default:
return true
}
})
outField := Field{
parent: &t,
name: field.Name(),
typ: field.Type().Underlying(),
annotations: fieldAnnotations,
doc: fieldDocs,
}
t.fields = append(t.fields, outField)
}
default:
return t, fmt.Errorf("parsing type: only struct types are supported for generation: got %q", uti.String())
}
var genAnnotation string
for _, a := range t.annotations {
if strings.HasPrefix(a, FACTOR3_ANNOTATION_PREFIX_GENERATE) {
genAnnotation = strings.TrimPrefix(a, FACTOR3_ANNOTATION_PREFIX_GENERATE)
break
}
}
c, _ := parseConfig(genAnnotation) // ignoring error since the empty config is a good handling
t.config = c
return t, nil
}
func (a *App) generateCode(t Type) (map[string]string, error) {
return GenerateFilesForType(t)
}
func (a *App) getAnnotatedTypes(pkgID string) map[string]*UnparsedType {
results := make(map[string]*UnparsedType)
visitor := &annotationsVisitor{app: a, pkgID: pkgID, results: results}
for _, f := range a.pkgs[pkgID].Syntax {
ast.Walk(visitor, f)
}
// filter unannotated types
for key, result := range results {
var found bool
for _, a := range result.annotations {
if strings.HasPrefix(a, FACTOR3_ANNOTATION_PREFIX_GENERATE) {
found = true
break
}
}
if !found {
delete(results, key)
}
}
return results
}
type annotationsVisitor struct {
app *App
pkgID string
results map[string]*UnparsedType
lastDoc *ast.CommentGroup
}
func (v *annotationsVisitor) Visit(node ast.Node) ast.Visitor {
if node == nil {
return nil
}
switch n := node.(type) {
case *ast.FuncDecl:
return nil
case *ast.GenDecl:
if n.Tok != token.TYPE {
return nil
}
v.lastDoc = n.Doc
return v
case *ast.TypeSpec:
var annotations []string
if v.lastDoc != nil {
for _, line := range v.lastDoc.List {
if strings.HasPrefix(line.Text, FACTOR3_ANNOTATION_PREFIX) {
annotations = append(annotations, line.Text)
}
}
}
pkg := v.app.pkgs[v.pkgID]
object := pkg.Types.Scope().Lookup(n.Name.String())
if object == nil {
panic(fmt.Errorf("can't find types.Object for %q", n.Name.String()))
}
v.results[n.Name.String()] = &UnparsedType{
pkgID: v.pkgID,
name: n.Name.String(),
annotations: annotations,
doc: v.lastDoc.Text(),
object: object,
astTypeSpec: n,
}
return nil
default:
return v
}
}