Examples with ATNState org.antlr.v4.runtime.atn.ATNState used on opensource projects

Example 21 with ATNState

use of org.antlr.v4.runtime.atn.ATNState in project antlr4 by tunnelvisionlabs.

the class ParserATNFactory method tokenRef.

/**
 * From label {@code A} build graph {@code o-A->o}.
 */
@NotNull
@Override
public Handle tokenRef(@NotNull TerminalAST node) {
    ATNState left = newState(node);
    ATNState right = newState(node);
    int ttype = g.getTokenType(node.getText());
    left.addTransition(new AtomTransition(right, ttype));
    node.atnState = left;
    return new Handle(left, right);
}

Example 22 with ATNState

use of org.antlr.v4.runtime.atn.ATNState in project antlr4 by tunnelvisionlabs.

the class ParserATNFactory method action.

/**
 * Build what amounts to an epsilon transition with an action.
 *  The action goes into ATN though it is ignored during prediction
 *  if {@link ActionTransition#actionIndex actionIndex}{@code <0}.
 */
@NotNull
@Override
public Handle action(@NotNull ActionAST action) {
    // System.out.println("action: "+action);
    ATNState left = newState(action);
    ATNState right = newState(action);
    ActionTransition a = new ActionTransition(right, currentRule.index);
    left.addTransition(a);
    action.atnState = left;
    return new Handle(left, right);
}

Example 23 with ATNState

use of org.antlr.v4.runtime.atn.ATNState in project antlr4 by tunnelvisionlabs.

the class ParserATNFactory method _ruleRef.

@NotNull
public Handle _ruleRef(@NotNull GrammarAST node) {
    Rule r = g.getRule(node.getText());
    if (r == null) {
        g.tool.errMgr.grammarError(ErrorType.INTERNAL_ERROR, g.fileName, node.getToken(), "Rule " + node.getText() + " undefined");
        return null;
    }
    RuleStartState start = atn.ruleToStartState[r.index];
    ATNState left = newState(node);
    ATNState right = newState(node);
    int precedence = 0;
    if (((GrammarASTWithOptions) node).getOptionString(LeftRecursiveRuleTransformer.PRECEDENCE_OPTION_NAME) != null) {
        precedence = Integer.parseInt(((GrammarASTWithOptions) node).getOptionString(LeftRecursiveRuleTransformer.PRECEDENCE_OPTION_NAME));
    }
    RuleTransition call = new RuleTransition(start, r.index, precedence, right);
    left.addTransition(call);
    node.atnState = left;
    return new Handle(left, right);
}

Example 24 with ATNState

use of org.antlr.v4.runtime.atn.ATNState in project antlr4 by tunnelvisionlabs.

the class ParserATNFactory method optional.

/**
 * From {@code (A)?} build either:
 *
 * <pre>
 *  o--A-&gt;o
 *  |     ^
 *  o----&gt;|
 * </pre>
 *
 * or, if {@code A} is a block, just add an empty alt to the end of the
 * block
 */
@NotNull
@Override
public Handle optional(@NotNull GrammarAST optAST, @NotNull Handle blk) {
    BlockStartState blkStart = (BlockStartState) blk.left;
    ATNState blkEnd = blk.right;
    preventEpsilonOptionalBlocks.add(Tuple.create(currentRule, blkStart, blkEnd));
    boolean greedy = ((QuantifierAST) optAST).isGreedy();
    // no way to express SLL restriction
    blkStart.sll = false;
    blkStart.nonGreedy = !greedy;
    epsilon(blkStart, blk.right, !greedy);
    optAST.atnState = blk.left;
    return blk;
}

Example 25 with ATNState

use of org.antlr.v4.runtime.atn.ATNState in project antlr4 by tunnelvisionlabs.

the class ParserATNFactory method newState.

@NotNull
public <T extends ATNState> T newState(@NotNull Class<T> nodeType, GrammarAST node) {
    Exception cause;
    try {
        Constructor<T> ctor = nodeType.getConstructor();
        T s = ctor.newInstance();
        if (currentRule == null)
            s.setRuleIndex(-1);
        else
            s.setRuleIndex(currentRule.index);
        atn.addState(s);
        return s;
    } catch (InstantiationException ex) {
        cause = ex;
    } catch (IllegalAccessException ex) {
        cause = ex;
    } catch (IllegalArgumentException ex) {
        cause = ex;
    } catch (InvocationTargetException ex) {
        cause = ex;
    } catch (NoSuchMethodException ex) {
        cause = ex;
    } catch (SecurityException ex) {
        cause = ex;
    }
    String message = String.format("Could not create %s of type %s.", ATNState.class.getName(), nodeType.getName());
    throw new UnsupportedOperationException(message, cause);
}