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

tools/goctl/pkg/parser/api/ast/kvexpression.go

@@ -0,0 +1,39 @@
+package ast
+
+import "github.com/zeromicro/go-zero/tools/goctl/pkg/parser/api/token"
+
+// KVExpr is a key value expression.
+type KVExpr struct {
+	// Key is the key of the key value expression.
+	Key *TokenNode
+	// Value is the value of the key value expression.
+	Value *TokenNode
+}
+
+func (i *KVExpr) HasHeadCommentGroup() bool {
+	return i.Key.HasHeadCommentGroup()
+}
+
+func (i *KVExpr) HasLeadingCommentGroup() bool {
+	return i.Value.HasLeadingCommentGroup()
+}
+
+func (i *KVExpr) CommentGroup() (head, leading CommentGroup) {
+	return i.Key.HeadCommentGroup, i.Value.LeadingCommentGroup
+}
+
+func (i *KVExpr) Format(prefix ...string) string {
+	w := NewBufferWriter()
+	w.Write(withNode(i.Key, i.Value), withPrefix(prefix...), withInfix(Indent), withRawText())
+	return w.String()
+}
+
+func (i *KVExpr) End() token.Position {
+	return i.Value.End()
+}
+
+func (i *KVExpr) Pos() token.Position {
+	return i.Key.Pos()
+}
+
+func (i *KVExpr) exprNode() {}