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added check for v3 backward incompatibility: tree grammars

This commit is contained in:
Terence Parr 2012-11-18 12:53:21 -08:00
parent aba4034051
commit 397f28d12c
7 changed files with 42 additions and 15 deletions
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2
CHANGES.txt
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@ -5,6 +5,8 @@ November 18, 2012
* fixed: undefined rule refs caused exception
* cleanup, rm dead etypes, add check for ids that cause code gen issues
* added notion of one-off error
* added check for v3 backward incompatibilities:
** tree grammars
November 17, 2012

30
tool/src/org/antlr/v4/Tool.java
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@ -46,6 +46,7 @@ import org.antlr.v4.parse.ANTLRParser;
import org.antlr.v4.parse.GrammarASTAdaptor;
import org.antlr.v4.parse.GrammarTreeVisitor;
import org.antlr.v4.parse.ToolANTLRParser;
import org.antlr.v4.parse.v3TreeGrammarException;
import org.antlr.v4.runtime.misc.LogManager;
import org.antlr.v4.runtime.misc.Nullable;
import org.antlr.v4.semantics.SemanticPipeline;
@ -556,7 +557,7 @@ public class Tool {
}
ANTLRFileStream in = new ANTLRFileStream(file.getAbsolutePath(), grammarEncoding);
GrammarRootAST t = load(in);
GrammarRootAST t = load(fileName, in);
return t;
}
catch (IOException ioe) {
@ -586,17 +587,17 @@ public class Tool {
}
ANTLRFileStream in = new ANTLRFileStream(importedFile.getAbsolutePath());
GrammarRootAST root = load(in);
GrammarRootAST root = load(g.fileName, in);
Grammar imported = createGrammar(root);
imported.fileName = importedFile.getAbsolutePath();
return imported;
}
public GrammarRootAST loadFromString(String grammar) {
return load(new ANTLRStringStream(grammar));
return load("<string>", new ANTLRStringStream(grammar));
}
public GrammarRootAST load(CharStream in) {
public GrammarRootAST load(String fileName, CharStream in) {
try {
GrammarASTAdaptor adaptor = new GrammarASTAdaptor(in);
ANTLRLexer lexer = new ANTLRLexer(in);
@ -604,15 +605,20 @@ public class Tool {
lexer.tokens = tokens;
ToolANTLRParser p = new ToolANTLRParser(tokens, this);
p.setTreeAdaptor(adaptor);
ParserRuleReturnScope r = p.grammarSpec();
GrammarAST root = (GrammarAST)r.getTree();
if ( root instanceof GrammarRootAST) {
((GrammarRootAST)root).hasErrors = p.getNumberOfSyntaxErrors()>0;
((GrammarRootAST)root).tokens = tokens;
if ( grammarOptions!=null ) {
((GrammarRootAST)root).cmdLineOptions = grammarOptions;
try {
ParserRuleReturnScope r = p.grammarSpec();
GrammarAST root = (GrammarAST)r.getTree();
if ( root instanceof GrammarRootAST) {
((GrammarRootAST)root).hasErrors = p.getNumberOfSyntaxErrors()>0;
((GrammarRootAST)root).tokens = tokens;
if ( grammarOptions!=null ) {
((GrammarRootAST)root).cmdLineOptions = grammarOptions;
}
return ((GrammarRootAST)root);
}
return ((GrammarRootAST)root);
}
catch (v3TreeGrammarException e) {
errMgr.grammarError(ErrorType.V3_TREE_GRAMMAR, fileName, e.location);
}
return null;
}

1
tool/src/org/antlr/v4/parse/ANTLRLexer.g
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@ -398,6 +398,7 @@ FRAGMENT : 'fragment' ;
LEXER : 'lexer' ;
PARSER : 'parser' ;
GRAMMAR : 'grammar' ;
TREE_GRAMMAR : 'tree' WSNLCHARS* 'grammar' ;
PROTECTED : 'protected' ;
PUBLIC : 'public' ;
PRIVATE : 'private' ;

7
tool/src/org/antlr/v4/parse/ANTLRParser.g
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@ -1,6 +1,6 @@
/*
[The "BSD license"]
Copyright (c) 2010 Jim Idle, Terence Parr
Copyright (c) 2012 Jim Idle, Terence Parr
All rights reserved.
Redistribution and use in source and binary forms, with or without
@ -99,7 +99,7 @@ tokens {
@header {
/*
[The "BSD licence"]
Copyright (c) 2005-2009 Terence Parr
Copyright (c) 2005-20012 Terence Parr
All rights reserved.
Redistribution and use in source and binary forms, with or without
@ -202,6 +202,7 @@ if ( options!=null ) {
grammarType
@after {
if ( $tg!=null ) throw new v3TreeGrammarException(tg);
if ( $t!=null ) ((GrammarRootAST)$tree).grammarType = $t.type;
else ((GrammarRootAST)$tree).grammarType=COMBINED;
}
@ -211,6 +212,8 @@ grammarType
// A combined lexer and parser specification
| g=GRAMMAR -> GRAMMAR<GrammarRootAST>[$g, "COMBINED_GRAMMAR"]
| tg=TREE_GRAMMAR
)
;

12
tool/src/org/antlr/v4/parse/v3TreeGrammarException.java Normal file
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@ -0,0 +1,12 @@
package org.antlr.v4.parse;
import org.antlr.runtime.Token;
import org.antlr.v4.runtime.misc.ParseCancellationException;
public class v3TreeGrammarException extends ParseCancellationException {
public Token location;
public v3TreeGrammarException(Token location) {
this.location = location;
}
}

3
tool/src/org/antlr/v4/tool/ErrorType.java
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@ -116,6 +116,9 @@ public enum ErrorType {
LEXER_COMMAND_PLACEMENT_ISSUE(133, "->command in lexer rule <arg> must be last element of single outermost alt", ErrorSeverity.ERROR),
USE_OF_BAD_WORD(134, "symbol <arg> conflicts with generated code in target language or runtime", ErrorSeverity.ERROR),
// Backward incompatibility errors
V3_TREE_GRAMMAR(200, "tree grammars are not supported in ANTLR v4", ErrorSeverity.ERROR_ONE_OFF),
// Dependency sorting errors
/** t1.g4 -> t2.g4 -> t3.g4 ->t1.g4 */

2
tool/src/org/antlr/v4/tool/Grammar.java
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@ -238,7 +238,7 @@ public class Grammar implements AttributeResolver {
org.antlr.runtime.ANTLRStringStream in = new org.antlr.runtime.ANTLRStringStream(grammarText);
in.name = fileName;
this.ast = tool.load(in);
this.ast = tool.load(fileName, in);
if ( ast==null ) return;
// ensure each node has pointer to surrounding grammar