Merge pull request #922 from wenshao/master

improved sql formatter

src/main/java/com/alibaba/druid/sql/SQLUtils.java

@@ -253,7 +253,20 @@ public class SQLUtils {
             SQLStatement stmt = statementList.get(i);
             
             if (i > 0) {
-                visitor.println(";");
+                visitor.print(";");
+                
+                SQLStatement preStmt = statementList.get(i - 1);
+                List<String> comments = preStmt.getAfterCommentsDirect();
+                if (comments != null){
+                    for (int j = 0; j < comments.size(); ++j) {
+                        String comment = comments.get(j);
+                        if (j != 0) {
+                            visitor.println();
+                        }
+                        visitor.print(comment);
+                    }
+                }
+                visitor.println();
             }
             {
                 List<String> comments = stmt.getBeforeCommentsDirect();
@@ -268,9 +281,9 @@ public class SQLUtils {
             if (i == statementList.size() - 1) {
                 Boolean semi = (Boolean) stmt.getAttribute("format.semi");
                 if (semi != null && semi.booleanValue()) {
-                    if (stmt.hasAfterComment()) {
-                        visitor.println();
-                    }
+//                    if (stmt.hasAfterComment()) {
+//                        visitor.println();
+//                    }
                     visitor.print(";");
                 }
                 

src/main/java/com/alibaba/druid/sql/dialect/odps/parser/OdpsLexer.java

@@ -139,6 +139,7 @@ public class OdpsLexer extends Lexer {
             for (;;) {
                 if (ch == '\r') {
                     if (charAt(pos + 1) == '\n') {
+                        line++;
                         bufPos += 2;
                         scanChar();
                         break;
@@ -150,6 +151,7 @@ public class OdpsLexer extends Lexer {
                 }
 
                 if (ch == '\n') {
+                    line++;
                     scanChar();
                     bufPos++;
                     break;

src/main/java/com/alibaba/druid/sql/parser/Lexer.java

@@ -77,6 +77,8 @@ public class Lexer {
     protected boolean        endOfComment = false;
     
     protected boolean        keepComments = false;
+    
+    protected int            line         = 0;
 
     public Lexer(String input){
         this(input, null);
@@ -293,6 +295,10 @@ public class Lexer {
 
         for (;;) {
             if (isWhitespace(ch)) {
+                if (ch == '\n') {
+                    line++;
+                }
+                
                 scanChar();
                 continue;
             }
@@ -831,6 +837,7 @@ public class Lexer {
         for (;;) {
             if (ch == '\r') {
                 if (charAt(pos + 1) == '\n') {
+                    line++;
                     scanChar();
                     break;
                 }
@@ -839,6 +846,7 @@ public class Lexer {
             }
 
             if (ch == '\n') {
+                line++;
                 scanChar();
                 break;
             }
@@ -1185,4 +1193,8 @@ public class Lexer {
         }
         comments.add(stringVal);
     }
+    
+    public int getLine() {
+        return line;
+    }
 }

src/main/java/com/alibaba/druid/sql/parser/SQLStatementParser.java

@@ -159,9 +159,15 @@ public class SQLStatementParser extends SQLParser {
             }
 
             if (lexer.token() == Token.SEMI) {
+                int line0 = lexer.getLine();
                 lexer.nextToken();
-                if (lexer.isKeepComments()) {
+                int line1 = lexer.getLine();
+                
+                if (lexer.isKeepComments() && statementList.size() > 0) {
                     SQLStatement stmt = statementList.get(statementList.size() - 1);
+                    if (line1 - line0 <= 1) {
+                        stmt.addAfterComment(lexer.readAndResetComments());
+                    }
                     stmt.getAttributes().put("format.semi", Boolean.TRUE);
                 }
                 continue;