func ParseFile(fset *token.FileSet, filename string) *ast.File {
fi, err := os.Stat(filename)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
var p parser
var f *ast.File
if ext := filepath.Ext(fi.Name()); ext == ".calc" {
src, err := ioutil.ReadFile(filename)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
file := fset.Add(filepath.Base(filename), string(src))
p.init(file, filename, string(src))
f = p.parseFile()
}
if p.errors.Count() > 0 {
p.errors.Print()
return nil
}
return f
}
// ParseFile parses the file identified by filename and returns a pointer
// to an ast.File object. The file should contain Calc source code and
// have the .calc file extension.
// The returned AST object ast.File is nil if there is an error.
func ParseFile(fset *token.FileSet, filename, src string) (*ast.File, error) {
var r io.Reader
var sz int64
if src == "" {
f, err := os.Open(filename)
if err != nil {
return nil, err
}
defer f.Close()
fi, err := f.Stat()
if err != nil {
return nil, err
}
if ext := filepath.Ext(fi.Name()); ext != ".calc" {
return nil, fmt.Errorf("invalid file extension %s, must be .calc", ext)
}
r = f
sz = fi.Size()
fmt.Printf("%s:%d\n", fi.Name(), sz)
} else {
sr := strings.NewReader(src)
r = io.Reader(sr)
sz = sr.Size()
}
file := fset.Add(filepath.Base(filename), int(sz))
var p parser
p.init(file, filename, r, ast.NewScope(nil))
f := p.parseFile()
if p.errors.Count() > 0 {
return nil, p.errors
}
return f, nil
}