Merge pull request #25 from sjjian/fix_ident_naming_rule

fix ident naming rule

Author: sjjian

lexer.go

@@ -387,7 +387,10 @@ func init() {
 	AddTokenBetween([]byte("--"), []byte("\n"), true, skip)
 	AddTokenBetween([]byte(`/\*`), []byte("*/"), false, skip)
 
-	lexer.Add([]byte("[a-zA-Z]+\\w*"), token(_nonquotedIdentifier))
+	// see: https://docs.oracle.com/en/database/oracle/oracle-database/12.2/sqlrf/Database-Object-Names-and-Qualifiers.html#GUID-75337742-67FD-4EC0-985F-741C93D918DA
+	// Non quoted identifiers can only contain alphanumeric characters from your database
+	// character set and the underscore (_), dollar sign ($), and pound sign (#).
+	lexer.Add([]byte("[a-zA-Z][A-Za-z0-9_$#]*"), token(_nonquotedIdentifier))
 
 	lexer.Add([]byte(`[0-9]+`), func(s *lexmachine.Scanner, m *machines.Match) (interface{}, error) {
 		v, err := strconv.Atoi(string(m.Bytes))

test/create_table.sql

@@ -66,4 +66,9 @@ k INTEGER,
 c CHAR(120) DEFAULT '' NOT NULL,
 pad CHAR(60) DEFAULT '' NOT NULL,
 PRIMARY KEY (id)
-);
+);
+
+create table db1.table_1 (id_1 int);
+create table db1.table#1 (id#1 int);
+create table db1.table$1 (id$1 int);
+create table db1.table$#_1 (id$1_ int);