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prevent negative indexes

This commit is contained in:
Terence Parr 2012-06-01 17:35:13 -07:00
parent de83aacb65
commit 94071d7d82
1 changed files with 1 additions and 3 deletions
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4
tool/src/org/antlr/v4/tool/Grammar.java
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@ -51,13 +51,11 @@ import org.antlr.v4.runtime.misc.NotNull;
import org.antlr.v4.runtime.misc.Nullable;
import org.antlr.v4.tool.ast.ActionAST;
import org.antlr.v4.tool.ast.GrammarAST;
import org.antlr.v4.tool.ast.GrammarASTErrorNode;
import org.antlr.v4.tool.ast.GrammarASTWithOptions;
import org.antlr.v4.tool.ast.GrammarRootAST;
import org.antlr.v4.tool.ast.PredAST;
import org.antlr.v4.tool.ast.TerminalAST;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
@ -450,7 +448,7 @@ public class Grammar implements AttributeResolver {
tokenName = "EOF";
}
else {
if ( ttype<typeToTokenList.size() ) {
if ( ttype>0 && ttype<typeToTokenList.size() ) {
tokenName = typeToTokenList.get(ttype);
if ( tokenName!=null &&
tokenName.startsWith(AUTO_GENERATED_TOKEN_NAME_PREFIX) &&