cn.hutool.db.sql.SqlFormatter Maven / Gradle / Ivy
package cn.hutool.db.sql;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.Set;
import java.util.StringTokenizer;
/**
* SQL格式化器 from Hibernate
* @author looly
*/
public class SqlFormatter {
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");
}
private static String indentString = " ";
private static String initial = "\n ";
public static String format(String source) {
return new FormatProcess(source).perform().trim();
}
//------------------------------------------------------------------------------------------------
private static class FormatProcess {
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 FormatProcess(String sql) {
this.tokens = new StringTokenizer(sql, "()+*/-=<>'`\"[], \n\r\f\t", true);
}
public String perform() {
this.result.append(initial);
while (this.tokens.hasMoreTokens()) {
this.token = this.tokens.nextToken();
this.lcToken = this.token.toLowerCase();
if ("'".equals(this.token)) {
String t;
do {
t = this.tokens.nextToken();
this.token += t;
} while ((!"'".equals(t)) && (this.tokens.hasMoreTokens()));
} else if ("\"".equals(this.token)) {
String t;
do {
t = this.tokens.nextToken();
this.token += t;
} while (!"\"".equals(t));
}
if ((this.afterByOrSetOrFromOrSelect) && (",".equals(this.token))) {
commaAfterByOrFromOrSelect();
} else if ((this.afterOn) && (",".equals(this.token))) {
commaAfterOn();
} else if ("(".equals(this.token)) {
openParen();
} else if (")".equals(this.token)) {
closeParen();
} else if (BEGIN_CLAUSES.contains(this.lcToken)) {
beginNewClause();
} else if (END_CLAUSES.contains(this.lcToken)) {
endNewClause();
} else if ("select".equals(this.lcToken)) {
select();
} else if (DML.contains(this.lcToken)) {
updateOrInsertOrDelete();
} else if ("values".equals(this.lcToken)) {
values();
} else if ("on".equals(this.lcToken)) {
on();
} else if ((this.afterBetween) && (this.lcToken.equals("and"))) {
misc();
this.afterBetween = false;
} else if (LOGICAL.contains(this.lcToken)) {
logical();
} else if (isWhitespace(this.token)) {
white();
} else {
misc();
}
if (!isWhitespace(this.token)) {
this.lastToken = this.lcToken;
}
}
return this.result.toString();
}
private void commaAfterOn() {
out();
this.indent -= 1;
newline();
this.afterOn = false;
this.afterByOrSetOrFromOrSelect = true;
}
private void commaAfterByOrFromOrSelect() {
out();
newline();
}
private void logical() {
if ("end".equals(this.lcToken)) {
this.indent -= 1;
}
newline();
out();
this.beginLine = false;
}
private void on() {
this.indent += 1;
this.afterOn = true;
newline();
out();
this.beginLine = false;
}
private void misc() {
out();
if ("between".equals(this.lcToken)) {
this.afterBetween = true;
}
if (this.afterInsert) {
newline();
this.afterInsert = false;
} else {
this.beginLine = false;
if ("case".equals(this.lcToken)) {
this.indent += 1;
}
}
}
private void white() {
if (!this.beginLine) {
this.result.append(" ");
}
}
private void updateOrInsertOrDelete() {
out();
this.indent += 1;
this.beginLine = false;
if ("update".equals(this.lcToken)) {
newline();
}
if ("insert".equals(this.lcToken)) {
this.afterInsert = true;
}
}
private void select() {
out();
this.indent += 1;
newline();
this.parenCounts.addLast(new Integer(this.parensSinceSelect));
this.afterByOrFromOrSelects.addLast(Boolean.valueOf(this.afterByOrSetOrFromOrSelect));
this.parensSinceSelect = 0;
this.afterByOrSetOrFromOrSelect = true;
}
private void out() {
this.result.append(this.token);
}
private void endNewClause() {
if (!this.afterBeginBeforeEnd) {
this.indent -= 1;
if (this.afterOn) {
this.indent -= 1;
this.afterOn = false;
}
newline();
}
out();
if (!"union".equals(this.lcToken)) {
this.indent += 1;
}
newline();
this.afterBeginBeforeEnd = false;
this.afterByOrSetOrFromOrSelect = (("by".equals(this.lcToken)) || ("set".equals(this.lcToken)) || ("from".equals(this.lcToken)));
}
private void beginNewClause() {
if (!this.afterBeginBeforeEnd) {
if (this.afterOn) {
this.indent -= 1;
this.afterOn = false;
}
this.indent -= 1;
newline();
}
out();
this.beginLine = false;
this.afterBeginBeforeEnd = true;
}
private void values() {
this.indent -= 1;
newline();
out();
this.indent += 1;
newline();
// this.afterValues = true;
}
private void closeParen() {
this.parensSinceSelect -= 1;
if (this.parensSinceSelect < 0) {
this.indent -= 1;
this.parensSinceSelect = ((Integer) this.parenCounts.removeLast()).intValue();
this.afterByOrSetOrFromOrSelect = ((Boolean) this.afterByOrFromOrSelects.removeLast()).booleanValue();
}
if (this.inFunction > 0) {
this.inFunction -= 1;
out();
} else {
if (!this.afterByOrSetOrFromOrSelect) {
this.indent -= 1;
newline();
}
out();
}
this.beginLine = false;
}
private void openParen() {
if ((isFunctionName(this.lastToken)) || (this.inFunction > 0)) {
this.inFunction += 1;
}
this.beginLine = false;
if (this.inFunction > 0) {
out();
} else {
out();
if (!this.afterByOrSetOrFromOrSelect) {
this.indent += 1;
newline();
this.beginLine = true;
}
}
this.parensSinceSelect += 1;
}
private static boolean isFunctionName(String tok) {
char begin = tok.charAt(0);
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 " \n\r\f\t".indexOf(token) >= 0;
}
private void newline() {
this.result.append("\n");
for (int i = 0; i < this.indent; i++) {
this.result.append(indentString);
}
this.beginLine = true;
}
}
}