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|
package builder
import (
"go/ast"
"go/parser"
"go/token"
"io/ioutil"
"sort"
"strings"
"github.com/pkg/errors"
)
type visitor struct {
Path string
Package string
Boxes []string
Errors []error
}
func newVisitor(path string) *visitor {
return &visitor{
Path: path,
Boxes: []string{},
Errors: []error{},
}
}
func (v *visitor) Run() error {
b, err := ioutil.ReadFile(v.Path)
if err != nil {
return errors.WithStack(err)
}
fset := token.NewFileSet()
file, err := parser.ParseFile(fset, v.Path, string(b), parser.ParseComments)
if err != nil {
return errors.WithStack(err)
}
v.Package = file.Name.Name
ast.Walk(v, file)
m := map[string]string{}
for _, s := range v.Boxes {
m[s] = s
}
v.Boxes = []string{}
for k := range m {
v.Boxes = append(v.Boxes, k)
}
sort.Strings(v.Boxes)
if len(v.Errors) > 0 {
s := make([]string, len(v.Errors))
for i, e := range v.Errors {
s[i] = e.Error()
}
return errors.New(strings.Join(s, "\n"))
}
return nil
}
func (v *visitor) Visit(node ast.Node) ast.Visitor {
if node == nil {
return v
}
if err := v.eval(node); err != nil {
v.Errors = append(v.Errors, err)
}
return v
}
func (v *visitor) eval(node ast.Node) error {
switch t := node.(type) {
case *ast.CallExpr:
return v.evalExpr(t)
case *ast.Ident:
return v.evalIdent(t)
case *ast.GenDecl:
for _, n := range t.Specs {
if err := v.eval(n); err != nil {
return errors.WithStack(err)
}
}
case *ast.FuncDecl:
if t.Body == nil {
return nil
}
for _, b := range t.Body.List {
if err := v.evalStmt(b); err != nil {
return errors.WithStack(err)
}
}
return nil
case *ast.ValueSpec:
for _, e := range t.Values {
if err := v.evalExpr(e); err != nil {
return errors.WithStack(err)
}
}
}
return nil
}
func (v *visitor) evalStmt(stmt ast.Stmt) error {
switch t := stmt.(type) {
case *ast.ExprStmt:
return v.evalExpr(t.X)
case *ast.AssignStmt:
for _, e := range t.Rhs {
if err := v.evalArgs(e); err != nil {
return errors.WithStack(err)
}
}
}
return nil
}
func (v *visitor) evalExpr(expr ast.Expr) error {
switch t := expr.(type) {
case *ast.CallExpr:
if t.Fun == nil {
return nil
}
for _, a := range t.Args {
switch at := a.(type) {
case *ast.CallExpr:
if sel, ok := t.Fun.(*ast.SelectorExpr); ok {
return v.evalSelector(at, sel)
}
if err := v.evalArgs(at); err != nil {
return errors.WithStack(err)
}
case *ast.CompositeLit:
for _, e := range at.Elts {
if err := v.evalExpr(e); err != nil {
return errors.WithStack(err)
}
}
}
}
if ft, ok := t.Fun.(*ast.SelectorExpr); ok {
return v.evalSelector(t, ft)
}
case *ast.KeyValueExpr:
return v.evalExpr(t.Value)
}
return nil
}
func (v *visitor) evalArgs(expr ast.Expr) error {
switch at := expr.(type) {
case *ast.CompositeLit:
for _, e := range at.Elts {
if err := v.evalExpr(e); err != nil {
return errors.WithStack(err)
}
}
// case *ast.BasicLit:
// fmt.Println("evalArgs", at.Value)
// v.addBox(at.Value)
case *ast.CallExpr:
if at.Fun == nil {
return nil
}
switch st := at.Fun.(type) {
case *ast.SelectorExpr:
if err := v.evalSelector(at, st); err != nil {
return errors.WithStack(err)
}
case *ast.Ident:
return v.evalIdent(st)
}
for _, a := range at.Args {
if err := v.evalArgs(a); err != nil {
return errors.WithStack(err)
}
}
}
return nil
}
func (v *visitor) evalSelector(expr *ast.CallExpr, sel *ast.SelectorExpr) error {
x, ok := sel.X.(*ast.Ident)
if !ok {
return nil
}
if x.Name == "packr" && sel.Sel.Name == "NewBox" {
for _, e := range expr.Args {
switch at := e.(type) {
case *ast.Ident:
switch at.Obj.Kind {
case ast.Var:
if as, ok := at.Obj.Decl.(*ast.AssignStmt); ok {
v.addVariable(as)
}
case ast.Con:
if vs, ok := at.Obj.Decl.(*ast.ValueSpec); ok {
v.addConstant(vs)
}
}
return v.evalIdent(at)
case *ast.BasicLit:
v.addBox(at.Value)
case *ast.CallExpr:
return v.evalExpr(at)
}
}
}
return nil
}
func (v *visitor) evalIdent(i *ast.Ident) error {
if i.Obj == nil {
return nil
}
if s, ok := i.Obj.Decl.(*ast.AssignStmt); ok {
return v.evalStmt(s)
}
return nil
}
func (v *visitor) addBox(b string) {
b = strings.Replace(b, "\"", "", -1)
v.Boxes = append(v.Boxes, b)
}
func (v *visitor) addVariable(as *ast.AssignStmt) error {
if len(as.Rhs) == 1 {
if bs, ok := as.Rhs[0].(*ast.BasicLit); ok {
v.addBox(bs.Value)
}
}
return nil
}
func (v *visitor) addConstant(vs *ast.ValueSpec) error {
if len(vs.Values) == 1 {
if bs, ok := vs.Values[0].(*ast.BasicLit); ok {
v.addBox(bs.Value)
}
}
return nil
}
|
