/
parser.go
120 lines (101 loc) · 2.28 KB
/
parser.go
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package accessor
import (
"fmt"
"go/token"
"go/types"
"path/filepath"
"reflect"
"strings"
"golang.org/x/tools/go/packages"
)
const (
accessorTag = "accessor"
ignoreTag = "-"
tagKeyGetter = "getter"
tagKeySetter = "setter"
tagKeyNoDefault = "noDefault"
)
const (
tagSep = ","
tagKeyValueSep = ":"
)
// ParsePackage parses the specified directory's package.
func ParsePackage(dir string) (*Package, error) {
const mode = packages.NeedName | packages.NeedFiles |
packages.NeedImports | packages.NeedTypes | packages.NeedSyntax
dir, err := filepath.Abs(dir)
if err != nil {
return nil, err
}
cfg := &packages.Config{
Mode: mode,
Tests: false,
}
pkgs, err := packages.Load(cfg, dir)
if err != nil {
return nil, err
}
if len(pkgs) != 1 {
return nil, fmt.Errorf("error: %d packages found", len(pkgs))
}
return &Package{
Package: pkgs[0],
Dir: dir,
Structs: parseStructs(pkgs[0]),
}, nil
}
func parseStructs(pkg *packages.Package) []*Struct {
scope := pkg.Types.Scope()
structs := make([]*Struct, 0, len(scope.Names()))
for _, name := range scope.Names() {
st, ok := scope.Lookup(name).Type().Underlying().(*types.Struct)
if !ok {
continue
}
structs = append(structs, &Struct{
Name: name,
Fields: parseFields(pkg.Fset, st),
})
}
return structs
}
func parseFields(fset *token.FileSet, st *types.Struct) []*Field {
fields := make([]*Field, st.NumFields())
for i := 0; i < st.NumFields(); i++ {
tag := parseTag(st.Tag(i))
field := st.Field(i)
fields[i] = &Field{
Name: field.Name(),
Type: field.Type(),
Tag: tag,
}
}
return fields
}
func parseTag(tag string) *Tag {
tagStr, ok := reflect.StructTag(strings.Trim(tag, "`")).Lookup(accessorTag)
if !ok {
return nil
}
var getter, setter *string
var noDefault bool
tags := strings.Split(tagStr, tagSep)
for _, tag := range tags {
keyValue := strings.Split(tag, tagKeyValueSep)
var value string
if len(keyValue) == 2 {
if v := strings.TrimSpace(keyValue[1]); v != ignoreTag {
value = v
}
}
switch strings.TrimSpace(keyValue[0]) {
case tagKeyGetter:
getter = &value
case tagKeySetter:
setter = &value
case tagKeyNoDefault:
noDefault = true
}
}
return &Tag{Setter: setter, Getter: getter, NoDefault: noDefault}
}