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Microsoft JDBC Driver for SQL Server.
/*
* Microsoft JDBC Driver for SQL Server Copyright(c) Microsoft Corporation All rights reserved. This program is made
* available under the terms of the MIT License. See the LICENSE file in the project root for more information.
*/
package com.microsoft.sqlserver.jdbc;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Deque;
import java.util.List;
import java.util.ListIterator;
import java.util.Stack;
import java.util.concurrent.atomic.AtomicInteger;
import org.antlr.v4.runtime.Token;
final class SQLServerParser {
private static final List SELECT_DELIMITING_WORDS = Arrays.asList(SQLServerLexer.WHERE,
SQLServerLexer.GROUP, SQLServerLexer.HAVING, SQLServerLexer.ORDER, SQLServerLexer.OPTION);
private static final List INSERT_DELIMITING_WORDS = Arrays.asList(SQLServerLexer.VALUES,
SQLServerLexer.OUTPUT, SQLServerLexer.LR_BRACKET, SQLServerLexer.SELECT, SQLServerLexer.EXECUTE,
SQLServerLexer.WITH, SQLServerLexer.DEFAULT);
private static final List DELETE_DELIMITING_WORDS = Arrays.asList(SQLServerLexer.OPTION,
SQLServerLexer.WHERE, SQLServerLexer.OUTPUT, SQLServerLexer.FROM);
private static final List UPDATE_DELIMITING_WORDS = Arrays.asList(SQLServerLexer.SET,
SQLServerLexer.OUTPUT, SQLServerLexer.WHERE, SQLServerLexer.OPTION);
private static final List FROM_DELIMITING_WORDS = Arrays.asList(SQLServerLexer.WHERE, SQLServerLexer.GROUP,
SQLServerLexer.HAVING, SQLServerLexer.ORDER, SQLServerLexer.OPTION, SQLServerLexer.AND);
/*
* Retrieves the table target from a single query.
*/
static void parseQuery(SQLServerTokenIterator iter, SQLServerFMTQuery query) throws SQLServerException {
Token t = null;
while (iter.hasNext()) {
t = iter.next();
switch (t.getType()) {
case SQLServerLexer.SELECT:
t = skipTop(iter);
while (t.getType() != SQLServerLexer.SEMI) {
if (t.getType() == SQLServerLexer.PARAMETER) {
String columnName = SQLServerParser.findColumnAroundParameter(iter);
query.getColumns().add(columnName);
}
if (t.getType() == SQLServerLexer.FROM) {
query.getTableTarget()
.add(getTableTargetChunk(iter, query.getAliases(), SELECT_DELIMITING_WORDS));
break;
}
if (iter.hasNext()) {
t = iter.next();
} else {
break;
}
}
break;
case SQLServerLexer.INSERT:
t = skipTop(iter);
// Check for optional keyword INTO and move the iterator back if it isn't there
if (t.getType() != SQLServerLexer.INTO) {
t = iter.previous();
}
query.getTableTarget().add(getTableTargetChunk(iter, query.getAliases(), INSERT_DELIMITING_WORDS));
List tableValues = getValuesList(iter);
// VALUES case
boolean valuesFound = false;
int valuesMarker = iter.nextIndex();
while (!valuesFound && iter.hasNext()) {
t = iter.next();
if (t.getType() == SQLServerLexer.VALUES) {
valuesFound = true;
do {
query.getValuesList().add(getValuesList(iter));
} while (iter.hasNext() && iter.next().getType() == SQLServerLexer.COMMA);
iter.previous();
}
}
if (!valuesFound) {
resetIteratorIndex(iter, valuesMarker);
}
if (!query.getValuesList().isEmpty()) {
for (List ls : query.getValuesList()) {
if (tableValues.isEmpty()) {
query.getColumns().add("*");
}
for (int i = 0; i < ls.size(); i++) {
if (ls.get(i).equalsIgnoreCase("?")) {
query.getColumns().add((tableValues.size() == 0) ? "?" : tableValues.get(i));
}
}
}
}
break;
case SQLServerLexer.DELETE:
t = skipTop(iter);
// Check for optional keyword FROM and move the iterator back if it isn't there
if (t.getType() != SQLServerLexer.FROM) {
t = iter.previous();
}
query.getTableTarget().add(getTableTargetChunk(iter, query.getAliases(), DELETE_DELIMITING_WORDS));
break;
case SQLServerLexer.UPDATE:
skipTop(iter);
t = iter.previous();
// Get next chunk
query.getTableTarget().add(getTableTargetChunk(iter, query.getAliases(), UPDATE_DELIMITING_WORDS));
break;
case SQLServerLexer.FROM:
query.getTableTarget().add(getTableTargetChunk(iter, query.getAliases(), FROM_DELIMITING_WORDS));
break;
case SQLServerLexer.PARAMETER:
int parameterIndex = iter.nextIndex();
String columnName = SQLServerParser.findColumnAroundParameter(iter);
query.getColumns().add(columnName);
resetIteratorIndex(iter, parameterIndex);
break;
default:
// skip, we only support SELECT/UPDATE/INSERT/DELETE
break;
}
}
}
static void resetIteratorIndex(SQLServerTokenIterator iter, int index) {
if (iter.nextIndex() < index) {
while (iter.nextIndex() != index) {
iter.next();
}
} else if (iter.nextIndex() > index) {
while (iter.nextIndex() != index) {
iter.previous();
}
}
}
private static String getRoundBracketChunk(SQLServerTokenIterator iter, Token t) {
StringBuilder sb = new StringBuilder();
sb.append('(');
Stack s = new Stack<>();
s.push("(");
while (!s.empty()) {
t = iter.next();
if (t.getType() == SQLServerLexer.RR_BRACKET) {
sb.append(")");
s.pop();
} else if (t.getType() == SQLServerLexer.LR_BRACKET) {
sb.append("(");
s.push("(");
} else {
sb.append(t.getText()).append(" ");
}
}
return sb.toString();
}
private static String getRoundBracketChunkBefore(SQLServerTokenIterator iter, Token t) {
StringBuilder sb = new StringBuilder();
sb.append('(');
Stack s = new Stack<>();
s.push(")");
while (!s.empty()) {
t = iter.previous();
if (t.getType() == SQLServerLexer.RR_BRACKET) {
sb.append("(");
s.push(")");
} else if (t.getType() == SQLServerLexer.LR_BRACKET) {
sb.append(")");
s.pop();
} else {
sb.append(t.getText()).append(" ");
}
}
return sb.toString();
}
private static final List OPERATORS = Arrays.asList(SQLServerLexer.EQUAL, SQLServerLexer.GREATER,
SQLServerLexer.LESS, SQLServerLexer.GREATER_EQUAL, SQLServerLexer.LESS_EQUAL, SQLServerLexer.NOT_EQUAL,
SQLServerLexer.PLUS_ASSIGN, SQLServerLexer.MINUS_ASSIGN, SQLServerLexer.MULT_ASSIGN,
SQLServerLexer.DIV_ASSIGN, SQLServerLexer.MOD_ASSIGN, SQLServerLexer.AND_ASSIGN, SQLServerLexer.XOR_ASSIGN,
SQLServerLexer.OR_ASSIGN, SQLServerLexer.STAR, SQLServerLexer.DIVIDE, SQLServerLexer.MODULE,
SQLServerLexer.PLUS, SQLServerLexer.MINUS, SQLServerLexer.LIKE, SQLServerLexer.IN, SQLServerLexer.BETWEEN);
static String findColumnAroundParameter(SQLServerTokenIterator iter) {
int index = iter.nextIndex();
iter.previous();
String value = findColumnBeforeParameter(iter);
resetIteratorIndex(iter, index);
if (value.equalsIgnoreCase("")) {
value = findColumnAfterParameter(iter);
resetIteratorIndex(iter, index);
}
return value;
}
private static String findColumnAfterParameter(SQLServerTokenIterator iter) {
StringBuilder sb = new StringBuilder();
while (sb.length() == 0 && iter.hasNext()) {
Token t = iter.next();
if (t.getType() == SQLServerLexer.NOT) {
t = iter.next(); // skip NOT
}
if (OPERATORS.contains(t.getType()) && iter.hasNext()) {
t = iter.next();
if (t.getType() != SQLServerLexer.PARAMETER) {
if (t.getType() == SQLServerLexer.LR_BRACKET) {
sb.append(getRoundBracketChunk(iter, t));
} else {
sb.append(t.getText());
}
for (int i = 0; i < 3 && iter.hasNext(); i++) {
t = iter.next();
if (t.getType() == SQLServerLexer.DOT) {
sb.append(".");
t = iter.next();
sb.append(t.getText());
}
}
}
} else {
return "";
}
}
return sb.toString();
}
private static String findColumnBeforeParameter(SQLServerTokenIterator iter) {
StringBuilder sb = new StringBuilder();
while (sb.length() == 0 && iter.hasPrevious()) {
Token t = iter.previous();
if (t.getType() == SQLServerLexer.DOLLAR) {
t = iter.previous(); // skip if it's a $ sign
}
if (t.getType() == SQLServerLexer.AND) {
if (iter.hasPrevious()) {
t = iter.previous();
if (iter.hasPrevious()) {
t = iter.previous(); // try to find BETWEEN
if (t.getType() == SQLServerLexer.BETWEEN) {
iter.next();
continue;
} else {
return "";
}
}
}
}
if (OPERATORS.contains(t.getType()) && iter.hasPrevious()) {
t = iter.previous();
if (t.getType() == SQLServerLexer.NOT) {
t = iter.previous(); // skip NOT if found
}
if (t.getType() != SQLServerLexer.PARAMETER) {
Deque d = new ArrayDeque<>();
if (t.getType() == SQLServerLexer.RR_BRACKET) {
d.push(getRoundBracketChunkBefore(iter, t));
} else {
d.push(t.getText());
}
// Linked-servers can have a maximum of 4 parts
for (int i = 0; i < 3; i++) {
t = iter.previous();
if (t.getType() == SQLServerLexer.DOT) {
d.push(".");
t = iter.previous();
d.push(t.getText());
}
}
d.stream().forEach(sb::append);
}
} else {
return "";
}
}
return sb.toString();
}
static List getValuesList(SQLServerTokenIterator iter) {
Token t = iter.next();
if (t.getType() == SQLServerLexer.LR_BRACKET) {
ArrayList parameterColumns = new ArrayList<>();
Deque d = new ArrayDeque<>();
StringBuilder sb = new StringBuilder();
do {
switch (t.getType()) {
case SQLServerLexer.LR_BRACKET:
if (!d.isEmpty()) {
sb.append('(');
}
d.push(SQLServerLexer.LR_BRACKET);
break;
case SQLServerLexer.RR_BRACKET:
if (d.peek() == SQLServerLexer.LR_BRACKET) {
d.pop();
}
if (!d.isEmpty()) {
sb.append(')');
} else {
parameterColumns.add(sb.toString().trim());
}
break;
case SQLServerLexer.COMMA:
if (d.size() == 1) {
parameterColumns.add(sb.toString().trim());
sb = new StringBuilder();
} else {
sb.append(',');
}
break;
default:
sb.append(t.getText());
break;
}
if (iter.hasNext() && !d.isEmpty()) {
t = iter.next();
}
} while (!d.isEmpty());
return parameterColumns;
} else {
iter.previous();
return new ArrayList<>();
}
}
/*
* Moves the iterator past the TOP clause to the next token. Returns the first token after the TOP clause.
*/
static Token skipTop(SQLServerTokenIterator iter) throws SQLServerException {
// Look for the TOP token
Token t = iter.next();
if (t.getType() == SQLServerLexer.TOP) {
t = iter.next();
if (t.getType() == SQLServerLexer.LR_BRACKET) {
getRoundBracketChunk(iter, t);
}
t = iter.next();
// Look for PERCENT, must come before WITH TIES
if (t.getType() == SQLServerLexer.PERCENT) {
t = iter.next();
}
// Look for WITH TIES
if (t.getType() == SQLServerLexer.WITH) {
t = iter.next();
if (t.getType() == SQLServerLexer.TIES) {
t = iter.next();
} else {
/*
* It's not a WITH TIES clause, move the iterator back. Note: this clause is probably not a valid
* T-SQL clause.
*/
t = iter.previous();
}
}
}
return t;
}
static String getCTE(SQLServerTokenIterator iter) throws SQLServerException {
Token t = iter.next();
if (t.getType() == SQLServerLexer.WITH) {
StringBuilder sb = new StringBuilder("WITH ");
getCTESegment(iter, sb);
return sb.toString();
} else {
iter.previous();
return "";
}
}
static void getCTESegment(SQLServerTokenIterator iter, StringBuilder sb) throws SQLServerException {
sb.append(getTableTargetChunk(iter, null, Arrays.asList(SQLServerLexer.AS)));
iter.next();
Token t = iter.next();
sb.append(" AS ");
if (t.getType() != SQLServerLexer.LR_BRACKET) {
SQLServerException.makeFromDriverError(null, null, SQLServerResource.getResource("R_invalidCTEFormat"), "",
false);
}
int leftRoundBracketCount = 0;
do {
sb.append(t.getText()).append(' ');
if (t.getType() == SQLServerLexer.LR_BRACKET) {
leftRoundBracketCount++;
} else if (t.getType() == SQLServerLexer.RR_BRACKET) {
leftRoundBracketCount--;
}
t = iter.next();
} while (leftRoundBracketCount > 0);
if (t.getType() == SQLServerLexer.COMMA) {
sb.append(", ");
getCTESegment(iter, sb);
} else {
iter.previous();
}
}
private static String getTableTargetChunk(SQLServerTokenIterator iter, List possibleAliases,
List delimiters) throws SQLServerException {
StringBuilder sb = new StringBuilder();
Token t = iter.next();
do {
switch (t.getType()) {
case SQLServerLexer.LR_BRACKET:
sb.append(getRoundBracketChunk(iter, t));
break;
case SQLServerLexer.OPENDATASOURCE:
case SQLServerLexer.OPENJSON:
case SQLServerLexer.OPENQUERY:
case SQLServerLexer.OPENROWSET:
case SQLServerLexer.OPENXML:
sb.append(t.getText());
t = iter.next();
if (t.getType() != SQLServerLexer.LR_BRACKET) {
SQLServerException.makeFromDriverError(null, null,
SQLServerResource.getResource("R_invalidOpenqueryCall"), "", false);
}
sb.append(getRoundBracketChunk(iter, t));
break;
case SQLServerLexer.AS:
sb.append(t.getText());
if (iter.hasNext()) {
String s = iter.next().getText();
possibleAliases.add(s);
sb.append(" ").append(s);
}
break;
default:
sb.append(t.getText());
break;
}
if (iter.hasNext()) {
sb.append(' ');
t = iter.next();
} else {
break;
}
} while (!delimiters.contains(t.getType()) && t.getType() != SQLServerLexer.SEMI);
if (iter.hasNext()) {
iter.previous();
}
return sb.toString().trim();
}
}
final class SQLServerTokenIterator {
private final AtomicInteger index;
private final int listSize;
private final ListIterator iter;
SQLServerTokenIterator(ArrayList tokenList) {
this.iter = tokenList.listIterator();
this.index = new AtomicInteger(0);
this.listSize = tokenList.size();
}
Token next() {
index.incrementAndGet();
return iter.next();
}
Token previous() {
index.decrementAndGet();
return iter.previous();
}
boolean hasNext() {
return (index.intValue() < listSize);
}
boolean hasPrevious() {
return (index.intValue() > 0);
}
int nextIndex() {
return index.intValue() + 1;
}
}