private void parse() {
String name = fEditor.getEditorInput().getName();
Reader reader = new StringReader(fEditor.getDocument().get());
Template template = null;
try {
parseHtml();
if (fEditor.getEditorInput() instanceof IFileEditorInput)
((IFileEditorInput) fEditor.getEditorInput())
.getFile()
.deleteMarkers(IMarker.PROBLEM, true, IResource.DEPTH_INFINITE);
RuntimeInstance runtime = VelocityEditorEnvironment.getParser();
SimpleNode root = runtime.parse(reader, name);
// Create tree model
NodeVisitor visitor = new NodeVisitor(name);
root.jjtAccept(visitor, null);
template = visitor.getTemplate();
fError = "";
} catch (ParseException e) {
if (!name.matches(".*?\\.jsp.*")) {
if (e.getMessage() != null) {
fError = e.getMessage();
Token token = e.currentToken;
if (token != null) {
fEditor.addProblemMarker(e.getMessage(), token.next.beginLine, IMarker.SEVERITY_ERROR);
}
} else {
fError = "";
}
}
} catch (Exception e) {
fError = "";
VelocityPlugin.log(e);
} finally {
try {
reader.close();
} catch (IOException e) {
VelocityPlugin.log(e);
}
}
// Replace saved template with the new parsed one
synchronized (this) {
if (template != null) {
fTemplate = template;
// Save last successful parse tree
fLastTemplate = template;
} else {
fTemplate = null;
}
}
// Update outline view and display error message in status line
Display.getDefault()
.syncExec(
new Runnable() {
public void run() {
fEditor.updateOutlinePage();
fEditor.displayErrorMessage(fError);
}
});
reconcile();
}
/*
* (non-Javadoc)
*
* @see Directive#render(InternalContextAdapter, java.io.Writer, Node)
*/
@Override
public boolean render(InternalContextAdapter context, Writer writer, Node node)
throws IOException, ResourceNotFoundException, ParseErrorException,
MethodInvocationException {
// 获得缓存信息
SimpleNode sn_region = (SimpleNode) node.jjtGetChild(0);
String region = (String) sn_region.value(context);
SimpleNode sn_key = (SimpleNode) node.jjtGetChild(1);
Serializable key = (Serializable) sn_key.value(context);
Node body = node.jjtGetChild(2);
// 检查内容是否有变化
String tpl_key = key + "@" + region;
String body_tpl = body.literal();
String old_body_tpl = body_templates.get(tpl_key);
String cache_html = CacheManager.get(String.class, region, key);
if (cache_html == null || !StringUtils.equals(body_tpl, old_body_tpl)) {
StringWriter sw = new StringWriter();
body.render(context, sw);
cache_html = sw.toString();
CacheManager.set(region, key, cache_html);
body_templates.put(tpl_key, body_tpl);
}
writer.write(cache_html);
return true;
}
/**
* Returns the result of substituting the variables defined by the fields of this class (a
* concrete subclass of TemplateVars) into the template returned by {@link #parsedTemplate()}.
*/
String toText() {
VelocityContext velocityContext = toVelocityContext();
StringWriter writer = new StringWriter();
SimpleNode parsedTemplate = parsedTemplate();
boolean rendered =
velocityRuntimeInstance.render(
velocityContext, writer, parsedTemplate.getTemplateName(), parsedTemplate);
if (!rendered) {
// I don't know when this happens. Usually you get an exception during rendering.
throw new IllegalArgumentException("Template rendering failed");
}
return writer.toString();
}
@Override
public SQLStatement processTemplate(String template, List<Object> positionalParameters) {
SimpleNode parsedTemplate = parse(template);
Map<String, Object> internalParameters = new HashMap<>();
PositionalParamMapper visitor =
new PositionalParamMapper(positionalParameters, internalParameters);
parsedTemplate.jjtAccept(visitor, null);
visitor.onFinish();
return processTemplate(template, parsedTemplate, internalParameters);
}
String buildStatement(VelocityContext context, String template, SimpleNode parsedTemplate)
throws Exception {
// ... not sure what InternalContextAdapter is for...
InternalContextAdapterImpl ica = new InternalContextAdapterImpl(context);
ica.pushCurrentTemplateName(template);
StringWriter out = new StringWriter(template.length());
try {
parsedTemplate.init(ica, velocityRuntime);
parsedTemplate.render(ica, out);
return out.toString();
} finally {
ica.popCurrentTemplateName();
}
}
