feat(goctl): Add api parser (#2585)

tools/goctl/pkg/parser/api/format/format.go

@@ -0,0 +1,45 @@
+package format
+
+import (
+	"bytes"
+	"io"
+	"io/ioutil"
+
+	"github.com/zeromicro/go-zero/tools/goctl/pkg/parser/api/parser"
+)
+
+// File formats the api file.
+func File(filename string) error {
+	data, err := ioutil.ReadFile(filename)
+	if err != nil {
+		return err
+	}
+	buffer := bytes.NewBuffer(nil)
+	if err := Source(data, buffer); err != nil {
+		return err
+	}
+	return ioutil.WriteFile(filename, buffer.Bytes(), 0666)
+}
+
+// Source formats the api source.
+func Source(source []byte, w io.Writer) error {
+	p := parser.New("", source)
+	result := p.Parse()
+	if err := p.CheckErrors(); err != nil {
+		return err
+	}
+
+	result.Format(w)
+	return nil
+}
+
+func formatForUnitTest(source []byte, w io.Writer) error {
+	p := parser.New("", source)
+	result := p.Parse()
+	if err := p.CheckErrors(); err != nil {
+		return err
+	}
+
+	result.FormatForUnitTest(w)
+	return nil
+}