Examples with Alternative org.antlr.v4.tool.Alternative used on opensource projects

Example 6 with Alternative

use of org.antlr.v4.tool.Alternative in project antlr4 by antlr.

the class Rule method getAltLabels.

/**
	 * Get {@code #} labels. The keys of the map are the labels applied to outer
	 * alternatives of a lexer rule, and the values are collections of pairs
	 * (alternative number and {@link AltAST}) identifying the alternatives with
	 * this label. Unlabeled alternatives are not included in the result.
	 */
public Map<String, List<Pair<Integer, AltAST>>> getAltLabels() {
    Map<String, List<Pair<Integer, AltAST>>> labels = new LinkedHashMap<String, List<Pair<Integer, AltAST>>>();
    for (int i = 1; i <= numberOfAlts; i++) {
        GrammarAST altLabel = alt[i].ast.altLabel;
        if (altLabel != null) {
            List<Pair<Integer, AltAST>> list = labels.get(altLabel.getText());
            if (list == null) {
                list = new ArrayList<Pair<Integer, AltAST>>();
                labels.put(altLabel.getText(), list);
            }
            list.add(new Pair<Integer, AltAST>(i, alt[i].ast));
        }
    }
    if (labels.isEmpty())
        return null;
    return labels;
}

Example 7 with Alternative

use of org.antlr.v4.tool.Alternative in project antlr4 by antlr.

the class TestGrammarParserInterpreter method testAltsWithLabels.

@Test
public void testAltsWithLabels() throws Exception {
    LexerGrammar lg = new LexerGrammar(lexerText);
    Grammar g = new Grammar("parser grammar T;\n" + "s : ID  # foo\n" + "  | INT # bar\n" + "  ;\n", lg);
    // it won't show the labels here because my simple node text provider above just shows the alternative
    testInterp(lg, g, "s", "a", "(s:1 a)");
    testInterp(lg, g, "s", "3", "(s:2 3)");
}

Example 8 with Alternative

use of org.antlr.v4.tool.Alternative in project antlr4 by antlr.

the class UseDefAnalyzer method trackTokenRuleRefsInActions.

// side-effect: updates Alternative with refs in actions
public static void trackTokenRuleRefsInActions(Grammar g) {
    for (Rule r : g.rules.values()) {
        for (int i = 1; i <= r.numberOfAlts; i++) {
            Alternative alt = r.alt[i];
            for (ActionAST a : alt.actions) {
                ActionSniffer sniffer = new ActionSniffer(g, r, alt, a, a.token);
                sniffer.examineAction();
            }
        }
    }
}

Example 9 with Alternative

use of org.antlr.v4.tool.Alternative in project antlr4 by antlr.

the class ParserFactory method needsImplicitLabel.

@Override
public boolean needsImplicitLabel(GrammarAST ID, LabeledOp op) {
    Alternative currentOuterMostAlt = getCurrentOuterMostAlt();
    boolean actionRefsAsToken = currentOuterMostAlt.tokenRefsInActions.containsKey(ID.getText());
    boolean actionRefsAsRule = currentOuterMostAlt.ruleRefsInActions.containsKey(ID.getText());
    return op.getLabels().isEmpty() && (actionRefsAsToken || actionRefsAsRule);
}

Example 10 with Alternative

use of org.antlr.v4.tool.Alternative in project antlr4 by antlr.

the class AttributeChecks method checkAllAttributeExpressions.

public static void checkAllAttributeExpressions(Grammar g) {
    for (ActionAST act : g.namedActions.values()) {
        AttributeChecks checker = new AttributeChecks(g, null, null, act, act.token);
        checker.examineAction();
    }
    for (Rule r : g.rules.values()) {
        for (ActionAST a : r.namedActions.values()) {
            AttributeChecks checker = new AttributeChecks(g, r, null, a, a.token);
            checker.examineAction();
        }
        for (int i = 1; i <= r.numberOfAlts; i++) {
            Alternative alt = r.alt[i];
            for (ActionAST a : alt.actions) {
                AttributeChecks checker = new AttributeChecks(g, r, alt, a, a.token);
                checker.examineAction();
            }
        }
        for (GrammarAST e : r.exceptions) {
            ActionAST a = (ActionAST) e.getChild(1);
            AttributeChecks checker = new AttributeChecks(g, r, null, a, a.token);
            checker.examineAction();
        }
        if (r.finallyAction != null) {
            AttributeChecks checker = new AttributeChecks(g, r, null, r.finallyAction, r.finallyAction.token);
            checker.examineAction();
        }
    }
}