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Merged
magnusp merged 1 commit into from
Oct 23, 2026
Merged

refactor(jdbc): share one SqlTokenizer across metadata parsers #154

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197 changes: 33 additions & 164 deletions libsql-jdbc/src/main/java/com/github/magnusp/libsql/jdbc/LibsqlResultSetMetaData.java
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Original file line number Diff line number Diff line change
Expand Up @@ -74,11 +74,11 @@ static boolean isAutoIncrementColumn(String createSql, String columnName) {
if (createSql == null || columnName == null) {
return false;
}
List<List<Token>> definitions = tableDefinitions(createSql);
List<List<SqlTokenizer.Token>> definitions = tableDefinitions(createSql);
if (definitions == null) {
return false;
}
for (List<Token> definition : definitions) {
for (List<SqlTokenizer.Token> definition : definitions) {
if (columnDefinitionIsAutoIncrement(definition, columnName)
|| tableConstraintIsAutoIncrement(definition, columnName)) {
return true;
Expand Down Expand Up @@ -526,14 +526,14 @@ private static TableInfo toTableInfo(StmtResult result, String fallbackName) {
return new TableInfo(tableName != null ? tableName : fallbackName, createSql, columns);
}

private static List<List<Token>> tableDefinitions(String createSql) {
List<Token> tokens = tokenize(createSql);
private static List<List<SqlTokenizer.Token>> tableDefinitions(String createSql) {
List<SqlTokenizer.Token> tokens = SqlTokenizer.tokenize(createSql);
if (tokens == null) {
return null;
}
int open = -1;
for (int i = 0; i < tokens.size(); i++) {
if (isSymbol(tokens.get(i), "(")) {
if (tokens.get(i).isSymbol("(")) {
open = i;
break;
}
Expand All @@ -542,17 +542,17 @@ private static List<List<Token>> tableDefinitions(String createSql) {
return null;
}

List<List<Token>> definitions = new ArrayList<>();
List<Token> current = new ArrayList<>();
List<List<SqlTokenizer.Token>> definitions = new ArrayList<>();
List<SqlTokenizer.Token> current = new ArrayList<>();
for (int i = open + 1; i < tokens.size(); i++) {
Token token = tokens.get(i);
if (isSymbol(token, ")") && token.depth() == 0) {
SqlTokenizer.Token token = tokens.get(i);
if (token.isSymbol(")") && token.depth() == 0) {
if (!current.isEmpty()) {
definitions.add(current);
}
return definitions;
}
if (isSymbol(token, ",") && token.depth() == 1) {
if (token.isSymbol(",") && token.depth() == 1) {
definitions.add(current);
current = new ArrayList<>();
continue;
Expand All @@ -562,31 +562,33 @@ private static List<List<Token>> tableDefinitions(String createSql) {
return null;
}

private static boolean columnDefinitionIsAutoIncrement(List<Token> definition, String columnName) {
private static boolean columnDefinitionIsAutoIncrement(
List<SqlTokenizer.Token> definition, String columnName) {
int start = skipConstraintName(definition);
if (start >= definition.size()) {
return false;
}
if (isConstraintKeyword(definition.get(start))) {
return false;
}
String name = identifier(definition.get(start));
String name = definition.get(start).identifier();
if (name == null || !name.equalsIgnoreCase(columnName)) {
return false;
}
return containsKeyword(definition, start + 1, definition.size(), "AUTOINCREMENT", 1);
}

private static boolean tableConstraintIsAutoIncrement(List<Token> definition, String columnName) {
private static boolean tableConstraintIsAutoIncrement(
List<SqlTokenizer.Token> definition, String columnName) {
int start = skipConstraintName(definition);
if (start + 1 >= definition.size()
|| !isWord(definition.get(start), "PRIMARY")
|| !isWord(definition.get(start + 1), "KEY")) {
|| !definition.get(start).isWord("PRIMARY")
|| !definition.get(start + 1).isWord("KEY")) {
return false;
}
int open = -1;
for (int i = start + 2; i < definition.size(); i++) {
if (isSymbol(definition.get(i), "(")) {
if (definition.get(i).isSymbol("(")) {
open = i;
break;
}
Expand All @@ -597,8 +599,9 @@ private static boolean tableConstraintIsAutoIncrement(List<Token> definition, St

int partStart = open + 1;
for (int i = open + 1; i < definition.size(); i++) {
Token token = definition.get(i);
if ((isSymbol(token, ",") && token.depth() == 2) || (isSymbol(token, ")") && token.depth() == 1)) {
SqlTokenizer.Token token = definition.get(i);
if ((token.isSymbol(",") && token.depth() == 2)
|| (token.isSymbol(")") && token.depth() == 1)) {
if (indexedColumnIsAutoIncrement(definition, partStart, i, columnName)) {
return true;
}
Expand All @@ -609,167 +612,41 @@ private static boolean tableConstraintIsAutoIncrement(List<Token> definition, St
}

private static boolean indexedColumnIsAutoIncrement(
List<Token> definition, int start, int end, String columnName) {
List<SqlTokenizer.Token> definition, int start, int end, String columnName) {
if (start >= end) {
return false;
}
String name = identifier(definition.get(start));
String name = definition.get(start).identifier();
return name != null
&& name.equalsIgnoreCase(columnName)
&& containsKeyword(definition, start + 1, end, "AUTOINCREMENT", 2);
}

private static int skipConstraintName(List<Token> definition) {
if (definition.size() >= 2 && isWord(definition.get(0), "CONSTRAINT")) {
private static int skipConstraintName(List<SqlTokenizer.Token> definition) {
if (definition.size() >= 2 && definition.get(0).isWord("CONSTRAINT")) {
return 2;
}
return 0;
}

private static boolean isConstraintKeyword(Token token) {
return isWord(token, "PRIMARY")
|| isWord(token, "UNIQUE")
|| isWord(token, "CHECK")
|| isWord(token, "FOREIGN");
private static boolean isConstraintKeyword(SqlTokenizer.Token token) {
return token.isWord("PRIMARY")
|| token.isWord("UNIQUE")
|| token.isWord("CHECK")
|| token.isWord("FOREIGN");
}

private static boolean containsKeyword(
List<Token> tokens, int start, int end, String keyword, int depth) {
List<SqlTokenizer.Token> tokens, int start, int end, String keyword, int depth) {
for (int i = start; i < end; i++) {
Token token = tokens.get(i);
if (token.depth() == depth && isWord(token, keyword)) {
SqlTokenizer.Token token = tokens.get(i);
if (token.depth() == depth && token.isWord(keyword)) {
return true;
}
}
return false;
}

private static boolean isWord(Token token, String word) {
return token.type() == TokenType.WORD && token.text().equalsIgnoreCase(word);
}

private static boolean isSymbol(Token token, String symbol) {
return token.type() == TokenType.SYMBOL && token.text().equals(symbol);
}

private static String identifier(Token token) {
return switch (token.type()) {
case IDENT, WORD -> token.text();
case SYMBOL -> null;
};
}

private static List<Token> tokenize(String sql) {
List<Token> tokens = new ArrayList<>();
int depth = 0;
int i = 0;
while (i < sql.length()) {
char c = sql.charAt(i);
if (Character.isWhitespace(c)) {
i++;
continue;
}
if (c == '-' && i + 1 < sql.length() && sql.charAt(i + 1) == '-') {
i += 2;
while (i < sql.length() && sql.charAt(i) != '\n' && sql.charAt(i) != '\r') {
i++;
}
continue;
}
if (c == '/' && i + 1 < sql.length() && sql.charAt(i + 1) == '*') {
int end = sql.indexOf("*/", i + 2);
if (end < 0) {
return null;
}
i = end + 2;
continue;
}
if (c == '\'') {
i = skipQuoted(sql, i, c);
if (i < 0) {
return null;
}
continue;
}
if (c == '"' || c == '`') {
int end = skipQuoted(sql, i, c);
if (end < 0) {
return null;
}
tokens.add(new Token(TokenType.IDENT, unescape(sql.substring(i + 1, end - 1), c), depth));
i = end;
continue;
}
if (c == '[') {
int end = sql.indexOf(']', i + 1);
if (end < 0) {
return null;
}
tokens.add(new Token(TokenType.IDENT, sql.substring(i + 1, end), depth));
i = end + 1;
continue;
}
if (c == '(') {
tokens.add(new Token(TokenType.SYMBOL, "(", depth));
depth++;
i++;
continue;
}
if (c == ')') {
if (depth == 0) {
return null;
}
depth--;
tokens.add(new Token(TokenType.SYMBOL, ")", depth));
i++;
continue;
}
if (isWordChar(c)) {
int start = i;
while (i < sql.length() && isWordChar(sql.charAt(i))) {
i++;
}
tokens.add(new Token(TokenType.WORD, sql.substring(start, i), depth));
continue;
}
tokens.add(new Token(TokenType.SYMBOL, String.valueOf(c), depth));
i++;
}
if (depth != 0) {
return null;
}
return tokens;
}

private static int skipQuoted(String sql, int start, char quote) {
int i = start + 1;
while (i < sql.length()) {
if (sql.charAt(i) == quote) {
if (i + 1 < sql.length() && sql.charAt(i + 1) == quote) {
i += 2;
continue;
}
return i + 1;
}
i++;
}
return -1;
}

private static String unescape(String content, char quote) {
String doubled = new String(new char[] {quote, quote});
return content.replace(doubled, String.valueOf(quote));
}

private static boolean isWordChar(char c) {
return c >= 0x80
|| (c >= 'a' && c <= 'z')
|| (c >= 'A' && c <= 'Z')
|| (c >= '0' && c <= '9')
|| c == '_'
|| c == '$';
}

private static String text(Value value) {
return value instanceof Value.Text t ? t.value() : null;
}
Expand All @@ -786,14 +663,6 @@ private enum SampleType {
NULL
}

private enum TokenType {
WORD,
IDENT,
SYMBOL
}

private record Token(TokenType type, String text, int depth) {}

private record ColumnInfo(boolean notNull, boolean primaryKey) {}

private record TableInfo(String name, String createSql, Map<String, ColumnInfo> columns) {}
Expand Down
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