/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.skife.jdbi.v2;
import org.antlr.runtime.CharStream;
import org.antlr.runtime.Token;
An SQL script parser.
It performs lexical analysis of a script and generates events for semicolons.
As a result it returns a script without comments and newlines.
/**
* An SQL script parser.
*
* <p>It performs lexical analysis of a script and generates events for semicolons.
* As a result it returns a script without comments and newlines.</p>
*/
class SqlScriptParser {
private final TokenHandler semicolonHandler;
SqlScriptParser(TokenHandler semicolonHandler) {
this.semicolonHandler = semicolonHandler;
}
public String parse(CharStream charStream) {
StringBuilder sb = new StringBuilder();
SqlScriptLexer lexer = new SqlScriptLexer(charStream);
boolean endOfFile = false;
while (!endOfFile) {
Token t = lexer.nextToken();
switch (t.getType()) {
case Token.EOF:
endOfFile = true;
break;
case SqlScriptLexer.SEMICOLON:
semicolonHandler.handle(t, sb);
break;
case SqlScriptLexer.COMMENT:
case SqlScriptLexer.MULTI_LINE_COMMENT:
break;
case SqlScriptLexer.NEWLINES:
if (sb.length() > 0) {
sb.append(" ");
}
break;
case SqlScriptLexer.QUOTED_TEXT:
case SqlScriptLexer.LITERAL:
case SqlScriptLexer.OTHER:
sb.append(t.getText());
break;
default:
throw new IllegalArgumentException("Unrecognizable token " + t);
}
}
return sb.toString();
}
interface TokenHandler {
void handle(Token t, StringBuilder sb);
}
}