Examples with NodeVisitor com.google.template.soy.basetree.NodeVisitor used on opensource projects

Example 1 with NodeVisitor

use of com.google.template.soy.basetree.NodeVisitor in project closure-templates by google.

the class MsgHtmlTagNode method getFullTagText.

/**
 * This method calculates a string that can be used to tell if two tags that were turned into
 * placeholders are equivalent and thus could be turned into identical placeholders.
 *
 * <p>In theory we should use something like {@link ExprEquivalence} to see if two nodes would
 * render the same thing. However, for backwards compatibility we need to use a different
 * heuristic. The old code would simply detect if the node had a single child and use the {@link
 * SoyNode#toSourceString()} of it for the tag text. Due to how the children were constructed,
 * this would only happen if the tag was a single {@link RawTextNode}, e.g. {@code <foo
 * class=bar>}. Now that we are actually parsing the html tags the rules are more complex. We
 * should instead only use the {@link SoyNode#toSourceString()} if the only (transitive) children
 * are {@link RawTextNode}, {@link HtmlAttributeNode} or {@link HtmlAttributeValueNode}.
 */
@Nullable
private static String getFullTagText(HtmlTagNode openTagNode) {
    class Visitor implements NodeVisitor<Node, VisitDirective> {

        boolean isConstantContent = true;

        @Override
        public VisitDirective exec(Node node) {
            if (node instanceof RawTextNode || node instanceof HtmlAttributeNode || node instanceof HtmlAttributeValueNode || node instanceof HtmlOpenTagNode || node instanceof HtmlCloseTagNode) {
                return VisitDirective.CONTINUE;
            }
            isConstantContent = false;
            return VisitDirective.ABORT;
        }
    }
    Visitor visitor = new Visitor();
    SoyTreeUtils.visitAllNodes(openTagNode, visitor);
    if (visitor.isConstantContent) {
        // toSourceString is lame, but how this worked before
        return openTagNode.toSourceString();
    }
    return null;
}

Example 2 with NodeVisitor

use of com.google.template.soy.basetree.NodeVisitor in project closure-templates by google.

the class SoyTreeUtils method hasNodesOfType.

/**
 * Returns true if the given {@code node} contains any children of the given types.
 */
@SafeVarargs
public static boolean hasNodesOfType(Node node, final Class<? extends Node>... types) {
    class Visitor implements NodeVisitor<Node, VisitDirective> {

        boolean found;

        @Override
        public VisitDirective exec(Node node) {
            for (Class type : types) {
                if (type.isInstance(node)) {
                    found = true;
                    return VisitDirective.ABORT;
                }
            }
            return VisitDirective.CONTINUE;
        }
    }
    Visitor v = new Visitor();
    visitAllNodes(node, v);
    return v.found;
}