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Add ATN optimizer (currently doesn't provide optimizations)

This commit is contained in:
Sam Harwell 2012-07-31 13:28:22 -05:00
parent eff9e0c47f
commit f9bacf5060
3 changed files with 51 additions and 0 deletions
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49
tool/src/org/antlr/v4/automata/ATNOptimizer.java Normal file
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@ -0,0 +1,49 @@
/*
[The "BSD license"]
Copyright (c) 2012 Terence Parr
Copyright (c) 2012 Sam Harwell
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. The name of the author may not be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.antlr.v4.automata;
import org.antlr.v4.runtime.atn.ATN;
import org.antlr.v4.runtime.misc.NotNull;
import org.antlr.v4.tool.Grammar;
/**
*
* @author Sam Harwell
*/
public class ATNOptimizer {
public static void optimize(@NotNull Grammar g, @NotNull ATN atn) {
}
private ATNOptimizer() {
}
}

1
tool/src/org/antlr/v4/automata/LexerATNFactory.java
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@ -104,6 +104,7 @@ public class LexerATNFactory extends ParserATNFactory {
}
}
ATNOptimizer.optimize(g, atn);
return atn;
}

1
tool/src/org/antlr/v4/automata/ParserATNFactory.java
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@ -76,6 +76,7 @@ public class ParserATNFactory implements ATNFactory {
atn.maxTokenType = g.getMaxTokenType();
addRuleFollowLinks();
addEOFTransitionToStartRules();
ATNOptimizer.optimize(g, atn);
return atn;
}