Support single quotes nested in double quotes in SQL scripts

Some databases such as Oracle permit double quoted column aliases that
contain case-sensitive characters, single quotes, and other special
characters; however, prior to this commit, SqlScripts interpreted a
single quote nested within double quotes as the start of a string
literal resulting in improper parsing.

This commit addresses this issue by ensuring that double quoted strings
such as column aliases are properly parsed even when containing single
quotes.

Issue: SPR-13218

spring-jdbc/src/main/java/org/springframework/jdbc/datasource/init/ScriptUtils.java

@@ -45,6 +45,7 @@ import org.springframework.util.StringUtils;
  * @author Chris Beams
  * @author Oliver Gierke
  * @author Chris Baldwin
+ * @author Nicolas Debeissat
  * @since 4.0.3
  */
 public abstract class ScriptUtils {
@@ -173,7 +174,8 @@ public abstract class ScriptUtils {
 		Assert.hasText(blockCommentEndDelimiter, "blockCommentEndDelimiter must not be null or empty");
 
 		StringBuilder sb = new StringBuilder();
-		boolean inLiteral = false;
+		boolean inSingleQuote = false;
+		boolean inDoubleQuote = false;
 		boolean inEscape = false;
 		char[] content = script.toCharArray();
 		for (int i = 0; i < script.length(); i++) {
@@ -189,10 +191,13 @@ public abstract class ScriptUtils {
 				sb.append(c);
 				continue;
 			}
-			if (c == '\'') {
-				inLiteral = !inLiteral;
+			if (!inDoubleQuote && (c == '\'')) {
+				inSingleQuote = !inSingleQuote;
 			}
-			if (!inLiteral) {
+			else if (!inSingleQuote && (c == '"')) {
+				inDoubleQuote = !inDoubleQuote;
+			}
+			if (!inSingleQuote && !inDoubleQuote) {
 				if (script.startsWith(separator, i)) {
 					// we've reached the end of the current statement
 					if (sb.length() > 0) {