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

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

@@ -0,0 +1,44 @@
+package ast
+
+import "github.com/zeromicro/go-zero/tools/goctl/pkg/parser/api/token"
+
+// SyntaxStmt represents a syntax statement.
+type SyntaxStmt struct {
+	// Syntax is the syntax token.
+	Syntax *TokenNode
+	// Assign is the assign token.
+	Assign *TokenNode
+	// Value is the syntax value.
+	Value *TokenNode
+}
+
+func (s *SyntaxStmt) HasHeadCommentGroup() bool {
+	return s.Syntax.HasHeadCommentGroup()
+}
+
+func (s *SyntaxStmt) HasLeadingCommentGroup() bool {
+	return s.Value.HasLeadingCommentGroup()
+}
+
+func (s *SyntaxStmt) CommentGroup() (head, leading CommentGroup) {
+	return s.Syntax.HeadCommentGroup, s.Syntax.LeadingCommentGroup
+}
+
+func (s *SyntaxStmt) Format(prefix ...string) string {
+	w := NewBufferWriter()
+	syntaxNode := transferTokenNode(s.Syntax,
+		withTokenNodePrefix(prefix...), ignoreLeadingComment())
+	assignNode := transferTokenNode(s.Assign, ignoreLeadingComment())
+	w.Write(withNode(syntaxNode, assignNode, s.Value), withPrefix(prefix...), expectSameLine())
+	return w.String()
+}
+
+func (s *SyntaxStmt) End() token.Position {
+	return s.Value.End()
+}
+
+func (s *SyntaxStmt) Pos() token.Position {
+	return s.Syntax.Pos()
+}
+
+func (s *SyntaxStmt) stmtNode() {}