Examples with CommonToken org.antlr.runtime.CommonToken used on opensource projects

Example 6 with CommonToken

use of org.antlr.runtime.CommonToken in project antlr4 by antlr.

the class GrammarTransformPipeline method extractImplicitLexer.

/** Build lexer grammar from combined grammar that looks like:
	 *
	 *  (COMBINED_GRAMMAR A
	 *      (tokens { X (= Y 'y'))
	 *      (OPTIONS (= x 'y'))
	 *      (@ members {foo})
	 *      (@ lexer header {package jj;})
	 *      (RULES (RULE .+)))
	 *
	 *  Move rules and actions to new tree, don't dup. Split AST apart.
	 *  We'll have this Grammar share token symbols later; don't generate
	 *  tokenVocab or tokens{} section.  Copy over named actions.
	 *
	 *  Side-effects: it removes children from GRAMMAR & RULES nodes
	 *                in combined AST.  Anything cut out is dup'd before
	 *                adding to lexer to avoid "who's ur daddy" issues
	 */
public GrammarRootAST extractImplicitLexer(Grammar combinedGrammar) {
    GrammarRootAST combinedAST = combinedGrammar.ast;
    //tool.log("grammar", "before="+combinedAST.toStringTree());
    GrammarASTAdaptor adaptor = new GrammarASTAdaptor(combinedAST.token.getInputStream());
    GrammarAST[] elements = combinedAST.getChildren().toArray(new GrammarAST[0]);
    // MAKE A GRAMMAR ROOT and ID
    String lexerName = combinedAST.getChild(0).getText() + "Lexer";
    GrammarRootAST lexerAST = new GrammarRootAST(new CommonToken(ANTLRParser.GRAMMAR, "LEXER_GRAMMAR"), combinedGrammar.ast.tokenStream);
    lexerAST.grammarType = ANTLRParser.LEXER;
    lexerAST.token.setInputStream(combinedAST.token.getInputStream());
    lexerAST.addChild((GrammarAST) adaptor.create(ANTLRParser.ID, lexerName));
    // COPY OPTIONS
    GrammarAST optionsRoot = (GrammarAST) combinedAST.getFirstChildWithType(ANTLRParser.OPTIONS);
    if (optionsRoot != null && optionsRoot.getChildCount() != 0) {
        GrammarAST lexerOptionsRoot = (GrammarAST) adaptor.dupNode(optionsRoot);
        lexerAST.addChild(lexerOptionsRoot);
        GrammarAST[] options = optionsRoot.getChildren().toArray(new GrammarAST[0]);
        for (GrammarAST o : options) {
            String optionName = o.getChild(0).getText();
            if (Grammar.lexerOptions.contains(optionName) && !Grammar.doNotCopyOptionsToLexer.contains(optionName)) {
                GrammarAST optionTree = (GrammarAST) adaptor.dupTree(o);
                lexerOptionsRoot.addChild(optionTree);
                lexerAST.setOption(optionName, (GrammarAST) optionTree.getChild(1));
            }
        }
    }
    // COPY all named actions, but only move those with lexer:: scope
    List<GrammarAST> actionsWeMoved = new ArrayList<GrammarAST>();
    for (GrammarAST e : elements) {
        if (e.getType() == ANTLRParser.AT) {
            lexerAST.addChild((Tree) adaptor.dupTree(e));
            if (e.getChild(0).getText().equals("lexer")) {
                actionsWeMoved.add(e);
            }
        }
    }
    for (GrammarAST r : actionsWeMoved) {
        combinedAST.deleteChild(r);
    }
    GrammarAST combinedRulesRoot = (GrammarAST) combinedAST.getFirstChildWithType(ANTLRParser.RULES);
    if (combinedRulesRoot == null)
        return lexerAST;
    // MOVE lexer rules
    GrammarAST lexerRulesRoot = (GrammarAST) adaptor.create(ANTLRParser.RULES, "RULES");
    lexerAST.addChild(lexerRulesRoot);
    List<GrammarAST> rulesWeMoved = new ArrayList<GrammarAST>();
    GrammarASTWithOptions[] rules;
    if (combinedRulesRoot.getChildCount() > 0) {
        rules = combinedRulesRoot.getChildren().toArray(new GrammarASTWithOptions[0]);
    } else {
        rules = new GrammarASTWithOptions[0];
    }
    for (GrammarASTWithOptions r : rules) {
        String ruleName = r.getChild(0).getText();
        if (Grammar.isTokenName(ruleName)) {
            lexerRulesRoot.addChild((Tree) adaptor.dupTree(r));
            rulesWeMoved.add(r);
        }
    }
    for (GrammarAST r : rulesWeMoved) {
        combinedRulesRoot.deleteChild(r);
    }
    // Will track 'if' from IF : 'if' ; rules to avoid defining new token for 'if'
    List<Pair<GrammarAST, GrammarAST>> litAliases = Grammar.getStringLiteralAliasesFromLexerRules(lexerAST);
    Set<String> stringLiterals = combinedGrammar.getStringLiterals();
    // add strings from combined grammar (and imported grammars) into lexer
    // put them first as they are keywords; must resolve ambigs to these rules
    //		tool.log("grammar", "strings from parser: "+stringLiterals);
    int insertIndex = 0;
    nextLit: for (String lit : stringLiterals) {
        // if lexer already has a rule for literal, continue
        if (litAliases != null) {
            for (Pair<GrammarAST, GrammarAST> pair : litAliases) {
                GrammarAST litAST = pair.b;
                if (lit.equals(litAST.getText()))
                    continue nextLit;
            }
        }
        // create for each literal: (RULE <uniquename> (BLOCK (ALT <lit>))
        String rname = combinedGrammar.getStringLiteralLexerRuleName(lit);
        // can't use wizard; need special node types
        GrammarAST litRule = new RuleAST(ANTLRParser.RULE);
        BlockAST blk = new BlockAST(ANTLRParser.BLOCK);
        AltAST alt = new AltAST(ANTLRParser.ALT);
        TerminalAST slit = new TerminalAST(new CommonToken(ANTLRParser.STRING_LITERAL, lit));
        alt.addChild(slit);
        blk.addChild(alt);
        CommonToken idToken = new CommonToken(ANTLRParser.TOKEN_REF, rname);
        litRule.addChild(new TerminalAST(idToken));
        litRule.addChild(blk);
        lexerRulesRoot.insertChild(insertIndex, litRule);
        //			lexerRulesRoot.getChildren().add(0, litRule);
        // reset indexes and set litRule parent
        lexerRulesRoot.freshenParentAndChildIndexes();
        // next literal will be added after the one just added
        insertIndex++;
    }
    // TODO: take out after stable if slow
    lexerAST.sanityCheckParentAndChildIndexes();
    combinedAST.sanityCheckParentAndChildIndexes();
    //		tool.log("grammar", combinedAST.toTokenString());
    combinedGrammar.tool.log("grammar", "after extract implicit lexer =" + combinedAST.toStringTree());
    combinedGrammar.tool.log("grammar", "lexer =" + lexerAST.toStringTree());
    if (lexerRulesRoot.getChildCount() == 0)
        return null;
    return lexerAST;
}

Example 7 with CommonToken

use of org.antlr.runtime.CommonToken in project antlr4 by antlr.

the class RuleRefAST method dupNode.

/** Dup token too since we overwrite during LR rule transform */
@Override
public RuleRefAST dupNode() {
    RuleRefAST r = new RuleRefAST(this);
    // In LR transform, we alter original token stream to make e -> e[n]
    // Since we will be altering the dup, we need dup to have the
    // original token.  We can set this tree (the original) to have
    // a new token.
    r.token = this.token;
    this.token = new CommonToken(r.token);
    return r;
}

Example 8 with CommonToken

use of org.antlr.runtime.CommonToken in project antlr4 by antlr.

the class GrammarASTAdaptor method create.

@Override
public /** Make sure even imaginary nodes know the input stream */
Object create(int tokenType, String text) {
    GrammarAST t;
    if (tokenType == ANTLRParser.RULE) {
        // needed by TreeWizard to make RULE tree
        t = new RuleAST(new CommonToken(tokenType, text));
    } else if (tokenType == ANTLRParser.STRING_LITERAL) {
        // implicit lexer construction done with wizard; needs this node type
        // whereas grammar ANTLRParser.g can use token option to spec node type
        t = new TerminalAST(new CommonToken(tokenType, text));
    } else {
        t = (GrammarAST) super.create(tokenType, text);
    }
    t.token.setInputStream(input);
    return t;
}

Example 9 with CommonToken

use of org.antlr.runtime.CommonToken in project antlr4 by antlr.

the class LeftRecursiveRuleAnalyzer method addPrecedenceArgToRules.

public AltAST addPrecedenceArgToRules(AltAST t, int prec) {
    if (t == null)
        return null;
    // get all top-level rule refs from ALT
    List<GrammarAST> outerAltRuleRefs = t.getNodesWithTypePreorderDFS(IntervalSet.of(RULE_REF));
    for (GrammarAST x : outerAltRuleRefs) {
        RuleRefAST rref = (RuleRefAST) x;
        boolean recursive = rref.getText().equals(ruleName);
        boolean rightmost = rref == outerAltRuleRefs.get(outerAltRuleRefs.size() - 1);
        if (recursive && rightmost) {
            GrammarAST dummyValueNode = new GrammarAST(new CommonToken(ANTLRParser.INT, "" + prec));
            rref.setOption(LeftRecursiveRuleTransformer.PRECEDENCE_OPTION_NAME, dummyValueNode);
        }
    }
    return t;
}

Example 10 with CommonToken

use of org.antlr.runtime.CommonToken in project SQLWindowing by hbutani.

the class SerializationUtils method addAntlrPersistenceDelegates.

public static void addAntlrPersistenceDelegates(XMLEncoder e) {
    e.setPersistenceDelegate(ASTNode.class, new PersistenceDelegate() {

        protected Expression instantiate(Object oldInstance, Encoder out) {
            return new Expression(oldInstance, oldInstance.getClass(), "new", new Object[] { ((ASTNode) oldInstance).getToken() });
        }
    });
    e.setPersistenceDelegate(CommonTree.class, new PersistenceDelegate() {

        protected Expression instantiate(Object oldInstance, Encoder out) {
            return new Expression(oldInstance, oldInstance.getClass(), "new", new Object[] { ((CommonTree) oldInstance).getToken() });
        }
    });
    e.setPersistenceDelegate(BaseTree.class, new PersistenceDelegate() {

        protected Expression instantiate(Object oldInstance, Encoder out) {
            return new Expression(oldInstance, oldInstance.getClass(), "new", new Object[] {});
        }

        @SuppressWarnings("rawtypes")
        protected void initialize(Class type, Object oldInstance, Object newInstance, Encoder out) {
            super.initialize(type, oldInstance, newInstance, out);
            BaseTree t = (BaseTree) oldInstance;
            for (int i = 0; i < t.getChildCount(); i++) {
                out.writeStatement(new Statement(oldInstance, "addChild", new Object[] { t.getChild(i) }));
            }
        }
    });
    e.setPersistenceDelegate(CommonToken.class, new PersistenceDelegate() {

        protected Expression instantiate(Object oldInstance, Encoder out) {
            return new Expression(oldInstance, oldInstance.getClass(), "new", new Object[] { ((CommonToken) oldInstance).getType(), ((CommonToken) oldInstance).getText() });
        }
    });
}