org.snt.inmemantlr.grammar.InmemantlrGrammar Maven / Gradle / Ivy
/**
* Inmemantlr - In memory compiler for Antlr 4
*
* The MIT License (MIT)
*
* Copyright (c) 2016 Julian Thome
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is furnished to do
* so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
**/
package org.snt.inmemantlr.grammar;
import org.antlr.v4.Tool;
import org.antlr.v4.runtime.Token;
import org.antlr.v4.tool.Grammar;
import org.antlr.v4.tool.ast.GrammarRootAST;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.snt.inmemantlr.tool.MemoryTokenVocabParser;
import java.util.Map;
/**
* special grammar class that operates in-memory
*/
public class InmemantlrGrammar extends Grammar {
private static final Logger LOGGER = LoggerFactory.getLogger(InmemantlrGrammar.class);
private String tokenVocab = "";
public InmemantlrGrammar(Tool tool, GrammarRootAST ast) {
super(tool, ast);
}
public void setTokenVocab(String tokenVocab) {
this.tokenVocab = tokenVocab;
}
/**
* We want to touch as little ANTR code as possible. We overload this
* function to pretend the existence of the token vocab parser
*/
@Override
public void importTokensFromTokensFile() {
if (!tokenVocab.isEmpty()) {
MemoryTokenVocabParser vparser = new MemoryTokenVocabParser(this, tokenVocab);
Map tokens = vparser.load();
int ret;
for (String t : tokens.keySet()) {
if (t.charAt(0) == '\'') {
ret = defineStringLiteral(t, tokens.get(t));
if (ret == Token.INVALID_TYPE)
throw new IllegalArgumentException("Token must not be INVAlID_TYPE");
} else {
ret = defineTokenName(t, tokens.get(t));
if (ret == Token.INVALID_TYPE)
throw new IllegalArgumentException("Token must not be INVAlID_TYPE");
}
LOGGER.debug("token {} {}", t, tokens.get(t));
}
}
}
}