/
traverser.go
141 lines (120 loc) · 3.2 KB
/
traverser.go
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package astTraversal
import (
"errors"
"go/ast"
"github.com/rs/zerolog"
)
type BaseTraverser struct {
baseActiveFile *FileNode
activeFile *FileNode
Log *zerolog.Logger
Packages *PackageManager
shouldAddComponent bool
addComponent func(result Result) error
}
func New(workDir string) *BaseTraverser {
packages := NewPackageManager(workDir)
return &BaseTraverser{
Packages: packages,
}
}
func (t *BaseTraverser) SetLog(log *zerolog.Logger) *BaseTraverser {
t.Log = log
return t
}
func (t *BaseTraverser) ActiveFile() *FileNode {
return t.activeFile
}
func (t *BaseTraverser) SetActiveFile(file *FileNode) *BaseTraverser {
t.baseActiveFile = file
t.activeFile = file
return t
}
func (t *BaseTraverser) Reset() {
t.activeFile = t.baseActiveFile
}
func (t *BaseTraverser) ExtractVarName(node ast.Node) Result {
packageNode := t.ActiveFile().Package
switch nodeType := node.(type) {
case *ast.Ident:
return Result{
Type: nodeType.Name,
Package: packageNode,
}
case *ast.SelectorExpr:
names := []string{nodeType.Sel.Name}
for {
switch n := nodeType.X.(type) {
case *ast.Ident:
name := n.Name
fileImport, ok := t.ActiveFile().FindImport(name) // We don't change the active file here.
if ok {
packageNode = fileImport.Package
} else {
names = append([]string{name}, names...)
}
return Result{
Package: packageNode,
Type: names[len(names)-1],
Names: names[:len(names)-1],
}
case *ast.SelectorExpr:
names = append([]string{n.Sel.Name}, names...)
nodeType = n
default:
return Result{}
}
}
}
return Result{}
}
func (t *BaseTraverser) FindDeclarationForNode(node ast.Node) (*DeclarationTraverser, error) {
switch nodeType := node.(type) {
case *ast.UnaryExpr:
return t.FindDeclarationForNode(nodeType.X)
case *ast.Ident:
if nodeType.Obj != nil { // Defined in file.
declNode, ok := nodeType.Obj.Decl.(ast.Node)
if !ok {
return nil, errors.New("declaration not found")
}
return t.Declaration(declNode, nodeType.Name)
} else { // Defined in package.
_, err := t.Packages.Get(t.ActiveFile().Package)
if err != nil {
return nil, err
}
newNode, file, err := t.ActiveFile().Package.FindASTForType(nodeType.Name)
if err != nil {
return nil, err
}
t.activeFile = file
return t.Declaration(newNode, nodeType.Name)
}
case *ast.SelectorExpr:
nodeIdent, ok := nodeType.X.(*ast.Ident)
if !ok {
return nil, errors.New("unsupported type")
}
if fileImport, ok := t.ActiveFile().FindImport(nodeIdent.Name); ok {
_, err := t.Packages.Get(fileImport.Package)
if err != nil {
return nil, err
}
newNode, file, err := fileImport.Package.FindASTForType(nodeType.Sel.Name)
if err != nil {
return nil, err
}
t.activeFile = file
return t.Declaration(newNode, nodeType.Sel.Name)
} else { // Property of a struct - need to recursively.
return nil, errors.New("not implemented yet")
}
}
return nil, errors.New("unsupported type")
}
func (t *BaseTraverser) SetAddComponentFunction(addComponent func(result Result) error) *BaseTraverser {
t.addComponent = addComponent
t.shouldAddComponent = true
return t
}