//$Id: Formatter.java 9961 2006-05-30 13:17:45Z max.andersen@jboss.com $
package org.hibernate.pretty;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.Set;
import java.util.StringTokenizer;
import org.hibernate.util.StringHelper;
public class Formatter {
private static final Set BEGIN_CLAUSES = new HashSet();
private static final Set END_CLAUSES = new HashSet();
private static final Set LOGICAL = new HashSet();
private static final Set QUANTIFIERS = new HashSet();
private static final Set DML = new HashSet();
private static final Set MISC = new HashSet();
static {
BEGIN_CLAUSES.add("left");
BEGIN_CLAUSES.add("right");
BEGIN_CLAUSES.add("inner");
BEGIN_CLAUSES.add("outer");
BEGIN_CLAUSES.add("group");
BEGIN_CLAUSES.add("order");
END_CLAUSES.add("where");
END_CLAUSES.add("set");
END_CLAUSES.add("having");
END_CLAUSES.add("join");
END_CLAUSES.add("from");
END_CLAUSES.add("by");
END_CLAUSES.add("join");
END_CLAUSES.add("into");
END_CLAUSES.add("union");
LOGICAL.add("and");
LOGICAL.add("or");
LOGICAL.add("when");
LOGICAL.add("else");
LOGICAL.add("end");
QUANTIFIERS.add("in");
QUANTIFIERS.add("all");
QUANTIFIERS.add("exists");
QUANTIFIERS.add("some");
QUANTIFIERS.add("any");
DML.add("insert");
DML.add("update");
DML.add("delete");
MISC.add("select");
MISC.add("on");
//MISC.add("values");
}
String indentString = " ";
String initial = "\n ";
boolean beginLine = true;
boolean afterBeginBeforeEnd = false;
boolean afterByOrSetOrFromOrSelect = false;
boolean afterValues = false;
boolean afterOn = false;
boolean afterBetween = false;
boolean afterInsert = false;
int inFunction = 0;
int parensSinceSelect = 0;
private LinkedList parenCounts = new LinkedList();
private LinkedList afterByOrFromOrSelects = new LinkedList();
int indent = 1;
StringBuffer result = new StringBuffer();
StringTokenizer tokens;
String lastToken;
String token;
String lcToken;
public Formatter(String sql) {
tokens = new StringTokenizer(
sql,
"()+*/-=<>'`\"[]," + StringHelper.WHITESPACE,
true
);
}
public Formatter setInitialString(String initial) {
this.initial = initial;
return this;
}
public Formatter setIndentString(String indent) {
this.indentString = indent;
return this;
}
public String format() {
result.append(initial);
while ( tokens.hasMoreTokens() ) {
token = tokens.nextToken();
lcToken = token.toLowerCase();
if ( "'".equals(token) ) {
String t;
do {
t = tokens.nextToken();
token += t;
}
while ( !"'".equals(t) && tokens.hasMoreTokens() ); // cannot handle single quotes
}
else if ( "\"".equals(token) ) {
String t;
do {
t = tokens.nextToken();
token += t;
}
while ( !"\"".equals(t) );
}
if ( afterByOrSetOrFromOrSelect && ",".equals(token) ) {
commaAfterByOrFromOrSelect();
}
else if ( afterOn && ",".equals(token) ) {
commaAfterOn();
}
else if ( "(".equals(token) ) {
openParen();
}
else if ( ")".equals(token) ) {
closeParen();
}
else if ( BEGIN_CLAUSES.contains(lcToken) ) {
beginNewClause();
}
else if ( END_CLAUSES.contains(lcToken) ) {
endNewClause();
}
else if ( "select".equals(lcToken) ) {
select();
}
else if ( DML.contains(lcToken) ) {
updateOrInsertOrDelete();
}
else if ( "values".equals(lcToken) ) {
values();
}
else if ( "on".equals(lcToken) ) {
on();
}
else if ( afterBetween && lcToken.equals("and") ) {
misc();
afterBetween = false;
}
else if ( LOGICAL.contains(lcToken) ) {
logical();
}
else if ( isWhitespace(token) ) {
white();
}
else {
misc();
}
if ( !isWhitespace( token ) ) lastToken = lcToken;
}
return result.toString();
}
private void commaAfterOn() {
out();
indent--;
newline();
afterOn = false;
afterByOrSetOrFromOrSelect = true;
}
private void commaAfterByOrFromOrSelect() {
out();
newline();
}
private void logical() {
if ( "end".equals(lcToken) ) indent--;
newline();
out();
beginLine = false;
}
private void on() {
indent++;
afterOn = true;
newline();
out();
beginLine = false;
}
private void misc() {
out();
if ( "between".equals(lcToken) ) {
afterBetween = true;
}
if (afterInsert) {
newline();
afterInsert = false;
}
else {
beginLine = false;
if ( "case".equals(lcToken) ) {
indent++;
}
}
}
private void white() {
if ( !beginLine ) {
result.append(" ");
}
}
private void updateOrInsertOrDelete() {
out();
indent++;
beginLine = false;
if ( "update".equals(lcToken) ) newline();
if ( "insert".equals(lcToken) ) afterInsert = true;
}
private void select() {
out();
indent++;
newline();
parenCounts.addLast( new Integer(parensSinceSelect) );
afterByOrFromOrSelects.addLast( new Boolean(afterByOrSetOrFromOrSelect) );
parensSinceSelect = 0;
afterByOrSetOrFromOrSelect = true;
}
private void out() {
result.append(token);
}
private void endNewClause() {
if (!afterBeginBeforeEnd) {
indent--;
if (afterOn) {
indent--;
afterOn=false;
}
newline();
}
out();
if ( !"union".equals(lcToken) ) indent++;
newline();
afterBeginBeforeEnd = false;
afterByOrSetOrFromOrSelect = "by".equals(lcToken)
|| "set".equals(lcToken)
|| "from".equals(lcToken);
}
private void beginNewClause() {
if (!afterBeginBeforeEnd) {
if (afterOn) {
indent--;
afterOn=false;
}
indent--;
newline();
}
out();
beginLine = false;
afterBeginBeforeEnd = true;
}
private void values() {
indent--;
newline();
out();
indent++;
newline();
afterValues = true;
}
private void closeParen() {
parensSinceSelect--;
if (parensSinceSelect<0) {
indent--;
parensSinceSelect = ( (Integer) parenCounts.removeLast() ).intValue();
afterByOrSetOrFromOrSelect = ( (Boolean) afterByOrFromOrSelects.removeLast() ).booleanValue();
}
if ( inFunction>0 ) {
inFunction--;
out();
}
else {
if (!afterByOrSetOrFromOrSelect) {
indent--;
newline();
}
out();
}
beginLine = false;
}
private void openParen() {
if ( isFunctionName( lastToken ) || inFunction>0 ) {
inFunction++;
}
beginLine = false;
if ( inFunction>0 ) {
out();
}
else {
out();
if (!afterByOrSetOrFromOrSelect) {
indent++;
newline();
beginLine = true;
}
}
parensSinceSelect++;
}
private static boolean isFunctionName(String tok) {
final char begin = tok.charAt(0);
final boolean isIdentifier = Character.isJavaIdentifierStart( begin ) || '"'==begin;
return isIdentifier &&
!LOGICAL.contains(tok) &&
!END_CLAUSES.contains(tok) &&
!QUANTIFIERS.contains(tok) &&
!DML.contains(tok) &&
!MISC.contains(tok);
}
private static boolean isWhitespace(String token) {
return StringHelper.WHITESPACE.indexOf(token)>=0;
}
private void newline() {
result.append("\n");
for ( int i=0; i<indent; i++ ) {
result.append(indentString);
}
beginLine = true;
}
public static void main(String[] args) {
if ( args.length>0 ) System.out.println(
new Formatter( StringHelper.join(" ", args) ).format()
);
}
}
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