public bool Evaluate(IContext context, TextWriter writer, string logTag, TextReader reader)
{
SimpleNode simpleNode = null;
try
{
simpleNode = this.ri.Parse(reader, logTag);
}
catch (ParseException ex)
{
throw new ParseErrorException(ex.Message, ex);
}
bool result;
if (simpleNode != null)
{
InternalContextAdapterImpl internalContextAdapterImpl = new InternalContextAdapterImpl(context);
internalContextAdapterImpl.PushCurrentTemplateName(logTag);
try
{
try
{
simpleNode.Init(internalContextAdapterImpl, this.ri);
}
catch (System.Exception ex2)
{
this.ri.Error(string.Concat(new object[]
{
"Velocity.evaluate() : init exception for tag = ",
logTag,
" : ",
ex2
}));
}
simpleNode.Render(internalContextAdapterImpl, writer);
}
finally
{
internalContextAdapterImpl.PopCurrentTemplateName();
}
result = true;
}
else
{
result = false;
}
return(result);
}
/// <summary>
/// Renders the macro using the context
/// </summary>
public override bool Render(IInternalContextAdapter context, TextWriter writer, INode node)
{
try
{
// it's possible the tree hasn't been parsed yet, so get
// the VMManager to parse and init it
if (nodeTree == null)
{
runtimeServices.Error(string.Format("VM error : {0}. Null AST", macroName));
}
else
{
if (!init)
{
nodeTree.Init(context, runtimeServices);
init = true;
}
// wrap the current context and add the VMProxyArg objects
VMContext vmContext = new VMContext(context, runtimeServices);
for (int i = 1; i < argArray.Length; i++)
{
// we can do this as VMProxyArgs don't change state. They change
// the context.
VMProxyArg arg = (VMProxyArg)proxyArgHash[argArray[i]];
vmContext.AddVMProxyArg(arg);
}
// now render the VM
nodeTree.Render(vmContext, writer);
}
}
catch (Exception e)
{
// if it's a MIE, it came from the render.... throw it...
if (e is MethodInvocationException)
{
throw;
}
runtimeServices.Error(string.Format("VelocimacroProxy.render() : exception VM = #{0}() : {1}", macroName, e));
}
return(true);
}
/// <summary>
/// Renders the input reader using the context into the output writer.
/// To be used when a template is dynamically constructed, or want to
/// use Velocity as a token replacer.
/// </summary>
/// <param name="context">context to use in rendering input string</param>
/// <param name="writer"> Writer in which to render the output</param>
/// <param name="logTag"> string to be used as the template name for log messages in case of error</param>
/// <param name="reader">Reader containing the VTL to be rendered</param>
/// <returns>true if successful, false otherwise. If false, see Velocity runtime log</returns>
public static bool Evaluate(IContext context, TextWriter writer, String logTag, TextReader reader)
{
SimpleNode nodeTree = null;
try
{
nodeTree = RuntimeSingleton.Parse(reader, logTag);
}
catch (ParseException parseException)
{
throw new ParseErrorException(parseException.Message, parseException);
}
// now we want to init and render
if (nodeTree != null)
{
InternalContextAdapterImpl internalContextAdapterImpl = new InternalContextAdapterImpl(context);
internalContextAdapterImpl.PushCurrentTemplateName(logTag);
try
{
try
{
nodeTree.Init(internalContextAdapterImpl, RuntimeSingleton.RuntimeServices);
}
catch (Exception exception)
{
RuntimeSingleton.Error(
string.Format("Velocity.evaluate() : init exception for tag = {0} : {1}", logTag, exception));
}
// now render, and let any exceptions fly
nodeTree.Render(internalContextAdapterImpl, writer);
}
finally
{
internalContextAdapterImpl.PopCurrentTemplateName();
}
return(true);
}
return(false);
}
/// <summary> returns the value of the reference. Generally, this is only
/// called for dynamic proxies, as the static ones should have
/// been stored in the VMContext's localContext store
/// *
/// </summary>
/// <param name="context">Context to use for getting current value
/// </param>
/// <returns>Object value
/// *
///
/// </returns>
public Object getObject(IInternalContextAdapter context)
{
try
{
/*
* we need to output based on our type
*/
Object retObject = null;
if (type == ParserTreeConstants.REFERENCE)
{
/*
* two cases : scalar reference ($foo) or multi-level ($foo.bar....)
*/
if (numTreeChildren == 0)
{
/*
* if I am a single-level reference, can I not get get it out of my context?
*/
retObject = context.Get(singleLevelRef);
}
else
{
/*
* I need to let the AST produce it for me.
*/
retObject = nodeTree.Execute(null, context);
}
}
else if (type == ParserTreeConstants.OBJECT_ARRAY)
{
retObject = nodeTree.Value(context);
}
else if (type == ParserTreeConstants.INTEGER_RANGE)
{
retObject = nodeTree.Value(context);
}
else if (type == ParserTreeConstants.TRUE)
{
retObject = staticObject;
}
else if (type == ParserTreeConstants.FALSE)
{
retObject = staticObject;
}
else if (type == ParserTreeConstants.STRING_LITERAL)
{
retObject = nodeTree.Value(context);
}
else if (type == ParserTreeConstants.NUMBER_LITERAL)
{
retObject = staticObject;
}
else if (type == ParserTreeConstants.TEXT)
{
/*
* this really shouldn't happen. text is just a throwaway arg for #foreach()
*/
try
{
StringWriter writer = new StringWriter();
nodeTree.Render(context, writer);
retObject = writer;
}
catch (System.Exception e)
{
runtimeServices.Error(string.Format("VMProxyArg.getObject() : error rendering reference : {0}", e));
}
}
else if (type == GENERALSTATIC)
{
retObject = staticObject;
}
else
{
runtimeServices.Error(
string.Format("Unsupported VM arg type : VM arg = {0} type = {1}( VMProxyArg.getObject() )", callerReference, type));
}
return(retObject);
}
catch (MethodInvocationException mie)
{
/*
* not ideal, but otherwise we propagate out to the
* VMContext, and the Context interface's put/get
* don't throw. So this is a the best compromise
* I can think of
*/
runtimeServices.Error(string.Format("VMProxyArg.getObject() : method invocation error getting value : {0}", mie));
return(null);
}
}
/// <summary> Evaluate the argument, convert to a String, and Evaluate again
/// (with the same context).
/// </summary>
/// <param name="context">
/// </param>
/// <param name="writer">
/// </param>
/// <param name="node">
/// </param>
/// <returns> True if the directive rendered successfully.
/// </returns>
/// <throws> IOException </throws>
/// <throws> ResourceNotFoundException </throws>
/// <throws> ParseErrorException </throws>
/// <throws> MethodInvocationException </throws>
public override bool Render(IInternalContextAdapter context, System.IO.TextWriter writer, INode node)
{
/*
* Evaluate the string with the current context. We know there is
* exactly one argument and it is a string or reference.
*/
object value = node.GetChild(0).Value(context);
string sourceText;
if (value != null)
{
sourceText = value.ToString();
}
else
{
sourceText = "";
}
/*
* The new string needs to be parsed since the text has been dynamically generated.
*/
string templateName = context.CurrentTemplateName;
SimpleNode nodeTree = null;
try
{
nodeTree = rsvc.Parse(new StringReader(sourceText), templateName, false);
}
catch (ParseException pex)
{
// use the line/column from the template
Info info = new Info(templateName, node.Line, node.Column);
throw new ParseErrorException(pex.Message, info);
}
catch (TemplateInitException pex)
{
Info info = new Info(templateName, node.Line, node.Column);
throw new ParseErrorException(pex.Message, info);
}
/*
* now we want to Init and render. Chain the context
* to prevent any changes to the current context.
*/
if (nodeTree != null)
{
IInternalContextAdapter ica = new EvaluateContext(context, rsvc);
ica.PushCurrentTemplateName(templateName);
try
{
try
{
nodeTree.Init(ica, rsvc);
}
catch (TemplateInitException pex)
{
Info info = new Info(templateName, node.Line, node.Column);
throw new ParseErrorException(pex.Message, info);
}
try
{
/*
* now render, and let any exceptions fly
*/
nodeTree.Render(ica, writer);
}
catch (ParseErrorException pex)
{
// convert any parsing errors to the correct line/col
Info info = new Info(templateName, node.Line, node.Column);
throw new ParseErrorException(pex.Message, info);
}
}
finally
{
ica.PopCurrentTemplateName();
}
return(true);
}
return(false);
}
/// <summary> Renders the macro using the context.
///
/// </summary>
/// <param name="context">Current rendering context
/// </param>
/// <param name="writer">Writer for output
/// </param>
/// <param name="node">AST that calls the macro
/// </param>
/// <returns> True if the directive rendered successfully.
/// </returns>
/// <throws> IOException </throws>
/// <throws> MethodInvocationException </throws>
/// <throws> MacroOverflowException </throws>
public override bool Render(IInternalContextAdapter context, System.IO.TextWriter writer, INode node)
{
// wrap the current context and Add the macro arguments
// the creation of this context is a major bottleneck (incl 2x HashMap)
//UPGRADE_NOTE: Final 已从“vmc ”的声明中移除。 "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1003'"
ProxyVMContext vmc = new ProxyVMContext(context, rsvc, localContextScope);
int callArguments = node.GetNumChildren();
if (callArguments > 0)
{
// the 0th element is the macro name
for (int i = 1; i < argArray.Length && i <= callArguments; i++)
{
INode macroCallArgument = node.GetChild(i - 1);
/*
* literalArgArray[i] is needed for "render literal if null" functionality.
* The value is used in ASTReference render-method.
*
* The idea is to avoid generating the literal until absolutely necessary.
*
* This makes VMReferenceMungeVisitor obsolete and it would not work anyway
* when the macro AST is shared
*/
vmc.AddVMProxyArg(context, argArray[i], literalArgArray[i], macroCallArgument);
}
}
/*
* check that we aren't already at the max call depth
*/
if (maxCallDepth > 0 && maxCallDepth == vmc.CurrentMacroCallDepth)
{
string templateName = vmc.CurrentTemplateName;
object[] stack = vmc.MacroNameStack;
System.Text.StringBuilder out_Renamed = new System.Text.StringBuilder(100).Append("Max calling depth of ").Append(maxCallDepth).Append(" was exceeded in Template:").Append(templateName).Append(" and Macro:").Append(macroName).Append(" with Call Stack:");
for (int i = 0; i < stack.Length; i++)
{
if (i != 0)
{
out_Renamed.Append("->");
}
out_Renamed.Append(stack[i]);
}
rsvc.Log.Error(out_Renamed);
try
{
throw new MacroOverflowException(out_Renamed.ToString());
}
finally
{
// clean out the macro stack, since we just broke it
while (vmc.CurrentMacroCallDepth > 0)
{
vmc.PopCurrentMacroName();
}
}
}
try
{
// render the velocity macro
vmc.PushCurrentMacroName(macroName);
nodeTree.Render(vmc, writer);
vmc.PopCurrentMacroName();
return(true);
}
catch (System.SystemException e)
{
throw e;
}
catch (System.Exception e)
{
string msg = "VelocimacroProxy.render() : exception VM = #" + macroName + "()";
rsvc.Log.Error(msg, e);
throw new VelocityException(msg, e);
}
}