private WidgetChain walk(PageCompilingContext pc, List<Node> nodes) {
WidgetChain chain = Chains.proceeding();
for (Node n : nodes) chain.addWidget(widgetize(pc, n, walk(pc, n)));
return chain;
}
/**
* This method converts an XML element into a specific kind of widget. Special cases are the XML
* widget, Header, @Require widget. Otherwise a standard widget is created.
*/
@SuppressWarnings({"JavaDoc"})
@NotNull
private <N extends Node> Renderable widgetize(
PageCompilingContext pc, N node, WidgetChain childsChildren) {
if (node instanceof XmlDeclaration) {
try {
XmlDeclaration decl = (XmlDeclaration) node;
return registry.xmlDirectiveWidget(decl.getWholeDeclaration(), pc.lexicalScopes.peek());
} catch (ExpressionCompileException e) {
pc.errors.add(CompileError.in(node.outerHtml()).near(line(node)).causedBy(e));
}
}
// Header widget is a special case, where we match by the name of the tag =(
if ("head".equals(node.nodeName())) {
try {
return registry.headWidget(
childsChildren, parseAttribs(node.attributes()), pc.lexicalScopes.peek());
} catch (ExpressionCompileException e) {
pc.errors.add(CompileError.in(node.outerHtml()).near(line(node)).causedBy(e));
}
}
String annotation = node.attr(ANNOTATION);
// if there is no annotation, treat as a raw xml-widget (i.e. tag)
if ((null == annotation) || 0 == annotation.trim().length())
try {
checkUriConsistency(pc, node);
checkFormFields(pc, node);
return registry.xmlWidget(
childsChildren,
node.nodeName(),
parseAttribs(node.attributes()),
pc.lexicalScopes.peek());
} catch (ExpressionCompileException e) {
pc.errors.add(CompileError.in(node.outerHtml()).near(line(node)).causedBy(e));
return Chains.terminal();
}
// Special case: is this annotated with @Require
// if so, tags in head need to be promoted to head of enclosing page.
if (REQUIRE_WIDGET.equalsIgnoreCase(annotation.trim()))
try {
return registry.requireWidget(
registry.xmlWidget(
childsChildren,
node.nodeName(),
parseAttribs(node.attributes()),
pc.lexicalScopes.peek()));
} catch (ExpressionCompileException e) {
pc.errors.add(CompileError.in(node.outerHtml()).near(line(node)).causedBy(e));
return Chains.terminal();
}
// If this is NOT a self-rendering widget, give it a child.
// final String widgetName = node.attr(ANNOTATION_KEY).trim().toLowerCase());
final String widgetName = node.attr(ANNOTATION_KEY).toLowerCase();
if (!registry.isSelfRendering(widgetName))
try {
childsChildren =
Chains.singleton(
registry.xmlWidget(
childsChildren,
node.nodeName(),
parseAttribs(node.attributes()),
pc.lexicalScopes.peek()));
} catch (ExpressionCompileException e) {
pc.errors.add(CompileError.in(node.outerHtml()).near(line(node)).causedBy(e));
}
// Recursively build widget from [Key, expression, child widgets].
try {
return registry.newWidget(
widgetName, node.attr(ANNOTATION_CONTENT), childsChildren, pc.lexicalScopes.peek());
} catch (ExpressionCompileException e) {
pc.errors.add(CompileError.in(node.outerHtml()).near(line(node)).causedBy(e));
// This should never be used.
return Chains.terminal();
}
}
/** Walks the DOM recursively, and converts elements into corresponding sitebricks widgets. */
@NotNull
private <N extends Node> WidgetChain walk(PageCompilingContext pc, N node) {
WidgetChain widgetChain = Chains.proceeding();
for (Node n : node.childNodes()) {
if (n instanceof Element) {
final Element child = (Element) n;
// push form if this is a form tag
if (child.tagName().equals("form")) pc.form = (Element) n;
// setup a lexical scope if we're going into a repeat widget (by reading the previous node)
final boolean shouldPopScope = lexicalClimb(pc, child);
// continue recursing down, perform a post-order, depth-first traversal of the DOM
WidgetChain childsChildren;
try {
childsChildren = walk(pc, child);
// process the widget itself into a Renderable with child tree
widgetChain.addWidget(widgetize(pc, child, childsChildren));
} finally {
lexicalDescend(pc, child, shouldPopScope);
}
} else if (n instanceof TextNode) {
TextNode child = (TextNode) n;
Renderable textWidget;
// setup a lexical scope if we're going into a repeat widget (by reading the previous node)
final boolean shouldPopScope = lexicalClimb(pc, child);
// construct the text widget
try {
textWidget = registry.textWidget(cleanHtml(n), pc.lexicalScopes.peek());
// if there are no annotations, add the text widget to the chain
if (!child.hasAttr(ANNOTATION_KEY)) {
widgetChain.addWidget(textWidget);
} else {
// construct a new widget chain for this text node
WidgetChain childsChildren = Chains.proceeding().addWidget(textWidget);
// make a new widget for the annotation, making the text chain the child
String widgetName = child.attr(ANNOTATION_KEY).toLowerCase();
Renderable annotationWidget =
registry.newWidget(
widgetName,
child.attr(ANNOTATION_CONTENT),
childsChildren,
pc.lexicalScopes.peek());
widgetChain.addWidget(annotationWidget);
}
} catch (ExpressionCompileException e) {
pc.errors.add(CompileError.in(node.outerHtml()).near(line(node)).causedBy(e));
}
if (shouldPopScope) pc.lexicalScopes.pop();
} else if ((n instanceof Comment) || (n instanceof DataNode)) {
// process as raw text widget
try {
widgetChain.addWidget(registry.textWidget(cleanHtml(n), pc.lexicalScopes.peek()));
} catch (ExpressionCompileException e) {
pc.errors.add(CompileError.in(node.outerHtml()).near(line(node)).causedBy(e));
}
} else if (n instanceof XmlDeclaration) {
try {
widgetChain.addWidget(
registry.xmlDirectiveWidget(
((XmlDeclaration) n).getWholeDeclaration(), pc.lexicalScopes.peek()));
} catch (ExpressionCompileException e) {
pc.errors.add(CompileError.in(node.outerHtml()).near(line(node)).causedBy(e));
}
}
}
// return computed chain, or a terminal
return widgetChain;
}
