// GetFuncValueSourceAsString returns the source of the func value fv.
func GetFuncValueSourceAsString(fv reflect.Value) string {
// Checking the kind catches cases where f was nil, resulting in fv being a zero Value (i.e. invalid kind),
// as well as when fv is non-func.
if fv.Kind() != reflect.Func {
return "kind not func"
}
pc := fv.Pointer()
if pc == 0 {
return "nil"
}
function := runtime.FuncForPC(pc)
if function == nil {
return "nil"
}
file, line := function.FileLine(pc)
var startIndex, endIndex int
{
b, err := ioutil.ReadFile(file)
if err != nil {
return "<file not found>"
}
startIndex, endIndex = getLineStartEndIndicies(b, line-1)
}
fs := token.NewFileSet()
fileAst, err := parser.ParseFile(fs, file, nil, 0*parser.ParseComments)
if err != nil {
return "<ParseFile failed>"
}
// TODO: Consider using ast.Walk() instead of custom FindFirst()
query := func(i interface{}) bool {
// TODO: Factor-out the unusual overlap check
if f, ok := i.(*ast.FuncLit); ok && ((startIndex <= int(f.Pos())-1 && int(f.Pos())-1 <= endIndex) || (int(f.Pos())-1 <= startIndex && startIndex <= int(f.End())-1)) {
return true
}
return false
}
funcAst := reflectfind.First(fileAst, query)
// If func literal wasn't found, try again looking for func declaration
if funcAst == nil {
query := func(i interface{}) bool {
// TODO: Factor-out the unusual overlap check
if f, ok := i.(*ast.FuncDecl); ok && ((startIndex <= int(f.Pos())-1 && int(f.Pos())-1 <= endIndex) || (int(f.Pos())-1 <= startIndex && startIndex <= int(f.End())-1)) {
return true
}
return false
}
funcAst = reflectfind.First(fileAst, query)
}
if funcAst == nil {
return fmt.Sprintf("<func src not found at %v:%v>", file, line)
}
return printerutil.SprintAst(fs, funcAst)
}
func getParent2ArgExprAllAsAst() []ast.Expr {
// TODO: Replace use of debug.Stack() with direct use of runtime package...
stack := string(stack())
// TODO: Bounds error checking, get rid of GetLine gists, etc.
parentName := getLine(stack, 5)
if !strings.Contains(parentName, ": ") {
// TODO: This happens when source file isn't present in same location as when built. See if can do anything better
// via direct use of runtime package (instead of debug.Stack(), which will exclude any func names)...
return nil
}
parentName = parentName[1:strings.Index(parentName, ": ")]
if dotPos := strings.LastIndex(parentName, "."); dotPos != -1 { // Trim package prefix.
parentName = parentName[dotPos+1:]
}
str := getLine(stack, 7)
str = str[strings.Index(str, ": ")+len(": "):]
p, err := parserutil.ParseStmt(str)
if err != nil {
return nil
}
innerQuery := func(i interface{}) bool {
if ident, ok := i.(*ast.Ident); ok && ident.Name == parentName {
return true
}
return false
}
query := func(i interface{}) bool {
if c, ok := i.(*ast.CallExpr); ok && nil != reflectfind.First(c.Fun, innerQuery) {
return true
}
return false
}
callExpr, _ := reflectfind.First(p, query).(*ast.CallExpr)
if callExpr == nil {
return nil
}
return callExpr.Args
}
