org.unitils.dbmaintainer.script.parsingstate.impl.InDoubleQuotesParsingState Maven / Gradle / Ivy
/*
* Copyright 2008, Unitils.org
*
* 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.unitils.dbmaintainer.script.parsingstate.impl;
import org.unitils.dbmaintainer.script.parsingstate.ParsingState;
import org.unitils.dbmaintainer.script.StatementBuilder;
/**
* A state for parsing double quotes ("text") literal part of a script.
*
* @author Tim Ducheyne
* @author Filip Neven
*/
public class InDoubleQuotesParsingState extends BaseParsingState {
/**
* The normal parsing state, that should be returned when the quote end is reached.
*/
protected ParsingState normalParsingState;
/**
* Determines whether backslashes can be used to escape characters, e.g. \" for a double quote (= "")
*/
protected boolean backSlashEscapingEnabled;
/**
* True if the next character should be escaped
*/
protected boolean escaping;
/**
* Initializes the state with the normal parsing state, that should be returned when the end of the literal is reached.
*
* @param normalParsingState The normal state, not null
* @param backSlashEscapingEnabled True if backslashes can be used for escaping
*/
public void init(ParsingState normalParsingState, boolean backSlashEscapingEnabled) {
this.normalParsingState = normalParsingState;
this.backSlashEscapingEnabled = backSlashEscapingEnabled;
}
/**
* Determines whether the end of the literal is reached.
* If that is the case, the normal parsing state is returned.
*
* @param previousChar The previous char, 0 if none
* @param currentChar The current char
* @param nextChar The next char, 0 if none
* @param statementBuilder The statement builder, not null
* @return The next parsing state, null if the end of the statement is reached
*/
protected ParsingState getNextParsingState(char previousChar, char currentChar, char nextChar, StatementBuilder statementBuilder) {
// escape current character
if (escaping) {
escaping = false;
return this;
}
// check for escaped double quotes
if (currentChar == '"' && nextChar == '"') {
escaping = true;
return this;
}
// check for escaped characters
if (currentChar == '\\' && backSlashEscapingEnabled) {
escaping = true;
return this;
}
// check for ending quote
if (currentChar == '"') {
return normalParsingState;
}
return this;
}
}