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PostgreSQL JDBC - NG - Driver
/**
* Copyright (c) 2013, impossibl.com
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of impossibl.com nor the names of its contributors may
* be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
package com.impossibl.postgres.jdbc;
import com.impossibl.postgres.jdbc.SQLTextTree.CommentPiece;
import com.impossibl.postgres.jdbc.SQLTextTree.CompositeNode;
import com.impossibl.postgres.jdbc.SQLTextTree.EscapeNode;
import com.impossibl.postgres.jdbc.SQLTextTree.GrammarPiece;
import com.impossibl.postgres.jdbc.SQLTextTree.MultiStatementNode;
import com.impossibl.postgres.jdbc.SQLTextTree.NumericLiteralPiece;
import com.impossibl.postgres.jdbc.SQLTextTree.ParameterPiece;
import com.impossibl.postgres.jdbc.SQLTextTree.ParenGroupNode;
import com.impossibl.postgres.jdbc.SQLTextTree.Processor;
import com.impossibl.postgres.jdbc.SQLTextTree.QuotedIdentifierPiece;
import com.impossibl.postgres.jdbc.SQLTextTree.StatementNode;
import com.impossibl.postgres.jdbc.SQLTextTree.StringLiteralPiece;
import com.impossibl.postgres.jdbc.SQLTextTree.UnquotedIdentifierPiece;
import com.impossibl.postgres.jdbc.SQLTextTree.WhitespacePiece;
import java.sql.SQLException;
import java.text.ParseException;
import java.util.Deque;
import java.util.LinkedList;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class SQLText {
private MultiStatementNode root;
public SQLText(String sqlText) throws ParseException {
root = parse(sqlText);
}
private SQLText(MultiStatementNode copyRoot) {
root = copyRoot;
}
public SQLText copy() {
return new SQLText((MultiStatementNode) root.copy());
}
public int getStatementCount() {
if (root == null)
return 0;
return root.getNodeCount();
}
public StatementNode getFirstStatement() {
if (root == null || root.getNodeCount() == 0)
return null;
return (StatementNode) root.get(0);
}
public StatementNode getLastStatement() {
if (root == null || root.getNodeCount() == 0)
return null;
return (StatementNode) root.get(root.getNodeCount() - 1);
}
public void addStatements(SQLText sqlText) {
root.nodes.addAll(sqlText.root.nodes);
}
public void process(Processor processor, boolean recurse) throws SQLException {
root.process(processor, recurse);
}
@Override
public String toString() {
return root.toString();
}
/*
* Lexical pattern for the parser that finds these things:
* > SQL identifier
* > SQL quoted identifier (ignoring escaped double quotes)
* > Single quoted strings (ignoring escaped single quotes)
* > SQL comments... from "--" to end of line
* > C-Style comments (including nested sections)
* > ? Parameter placeholders
* > ; Statement breaks
*/
private static final Pattern LEXER = Pattern
.compile(
"(?:\"((?:[^\"\"]|\\\\.)*)\")|" + /* Quoted identifier */
"(?:'((?:[^\'\']|\\\\.)*)')|" + /* String literal */
"((?:\\-\\-.*$)|(?:/\\*(?:(?:.|\\n)*)\\*/))|" + /* Comments */
"(\\?)|" + /* Parameter marker */
"(;)|" + /* Statement break */
"(\\{|\\})|" + /* Escape open/close */
"([a-zA-Z_][\\w_]*)|" + /* Unquoted identifier */
"((?:[+-]?(?:\\d+)?(?:\\.\\d+(?:[eE][+-]?\\d+)?))|(?:[+-]?\\d+))|" + /* Numeric literal */
"(\\(|\\))|" + /* Parens (grouping) */
"(,)|" + /* Comma (breaking) */
"(\\s+)|" + /* Whitespace */
"(\\$\\w*\\$)", /* Dollar quote */
Pattern.MULTILINE);
public static MultiStatementNode parse(String sql) throws ParseException {
Deque parents = new LinkedList<>();
parents.push(new MultiStatementNode(0));
parents.push(new StatementNode(0));
Matcher matcher = LEXER.matcher(sql);
int paramId = 1;
int startIdx = 0;
try {
while (matcher.find(startIdx)) {
//Add the unmatched region as grammar...
if (startIdx != matcher.start()) {
String txt = sql.substring(startIdx, matcher.start()).trim();
parents.peek().add(new GrammarPiece(txt, matcher.start()));
}
startIdx = matcher.end();
//Add whatever we matched...
String val;
if ((val = matcher.group(1)) != null) {
parents.peek().add(new QuotedIdentifierPiece(val, matcher.start()));
}
else if ((val = matcher.group(2)) != null) {
parents.peek().add(new StringLiteralPiece(val, matcher.start()));
}
else if ((val = matcher.group(3)) != null) {
parents.peek().add(new CommentPiece(val, matcher.start()));
}
else if ((val = matcher.group(4)) != null) {
parents.peek().add(new ParameterPiece(paramId++, matcher.start()));
}
else if ((val = matcher.group(5)) != null) {
if (parents.size() == 2) {
paramId = 1;
CompositeNode comp = parents.pop();
comp.setEndPos(matcher.end());
parents.peek().add(comp);
parents.push(new StatementNode(matcher.start()));
}
else {
parents.peek().add(new GrammarPiece(val, matcher.start()));
}
}
else if ((val = matcher.group(6)) != null) {
if (val.equals("{")) {
parents.push(new EscapeNode(matcher.start()));
}
else {
if (parents.peek() instanceof EscapeNode) {
EscapeNode tmp = (EscapeNode) parents.pop();
tmp.setEndPos(matcher.end());
parents.peek().add(tmp);
}
else {
throw new ParseException("Mismatched curly brace", matcher.start());
}
}
}
else if ((val = matcher.group(7)) != null) {
parents.peek().add(new UnquotedIdentifierPiece(val, matcher.start()));
}
else if ((val = matcher.group(8)) != null) {
parents.peek().add(new NumericLiteralPiece(val, matcher.start()));
}
else if ((val = matcher.group(9)) != null) {
if (val.equals("(")) {
parents.push(new ParenGroupNode(matcher.start()));
}
else {
if (parents.peek() instanceof ParenGroupNode) {
ParenGroupNode tmp = (ParenGroupNode) parents.pop();
tmp.setEndPos(matcher.end());
parents.peek().add(tmp);
}
else {
throw new ParseException("Mismmatched parenthesis", matcher.start());
}
}
}
else if ((val = matcher.group(10)) != null) {
parents.peek().add(new GrammarPiece(",", matcher.start()));
}
else if ((val = matcher.group(11)) != null) {
parents.peek().add(new WhitespacePiece(val, matcher.start()));
}
else if ((val = matcher.group(12)) != null) {
//Find the end of the $$ quoted block
int pos = sql.indexOf(val, matcher.end());
//Is this part of an identifier?
boolean ident = parents.peek().getLastNode() instanceof UnquotedIdentifierPiece;
//For $$ quotes to be valid they
// a) need to be closed
// b) must not be adjacent to an identifier
if (!ident && pos != -1) {
String quotedText = sql.substring(matcher.end(), pos);
parents.peek().add(new StringLiteralPiece(quotedText, val, matcher.start()));
startIdx = pos + val.length();
}
else {
//No end found... treat it as grammar
parents.peek().add(new GrammarPiece(val, matcher.start()));
}
}
}
//Add last grammar node
if (startIdx != sql.length()) {
parents.peek().add(new GrammarPiece(sql.substring(startIdx), startIdx));
}
//Auto close last statement
if (parents.peek() instanceof StatementNode) {
StatementNode stmt = (StatementNode) parents.peek();
stmt.trim();
if (stmt.getNodeCount() > 0) {
CompositeNode tmp = parents.pop();
tmp.setEndPos(startIdx);
parents.peek().add(tmp);
}
}
if (parents.peek() instanceof StatementNode == false && parents.peek() instanceof MultiStatementNode == false) {
throw new IllegalArgumentException("error parsing SQL");
}
return (MultiStatementNode)parents.getLast();
}
catch (ParseException e) {
throw e;
}
catch (Exception e) {
//Grab about 10 characters to report context of error
String errorTxt = sql.substring(startIdx, Math.min(sql.length(), startIdx + 10));
throw new ParseException("Error near: " + errorTxt, startIdx);
}
}
}
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