/** Create an evaluator using attributes from self */
public ActionEvaluator(StringTemplate self, ASTExpr chunk, StringTemplateWriter @out)
{
this.self = self;
this.chunk = chunk;
this.@out = @out;
}
/// <summary>A separator is normally just a string literal, but is still an AST that
/// we must evaluate. The separator can be any expression such as a template
/// include or string cat expression etc...
/// </summary>
protected internal virtual String computeSeparator(StringTemplate self, StringTemplateWriter outWriter, Object separator)
{
if (separator == null)
{
return null;
}
if (separator is StringTemplateAST)
{
StringTemplateAST separatorTree = (StringTemplateAST) separator;
// must evaluate, writing to a string so we can hand on to it
ASTExpr e = new ASTExpr(getEnclosingTemplate(), separatorTree, null);
System.IO.StringWriter buf = new System.IO.StringWriter();
// create a new instance of whatever StringTemplateWriter
// implementation they are using. Default is AutoIndentWriter.
// Defalut behavior is to indent but without
// any prior indents surrounding this attribute expression
StringTemplateWriter sw = null;
System.Type writerClass = outWriter.GetType();
try
{
System.Reflection.ConstructorInfo ctor = writerClass.GetConstructor(new System.Type[]{typeof(System.IO.TextWriter)});
sw = (StringTemplateWriter) ctor.Invoke(new Object[]{buf});
}
catch (System.Exception exc)
{
// default new AutoIndentWriter(buf)
self.error("cannot make implementation of StringTemplateWriter", exc);
sw = new AutoIndentWriter(buf);
}
try
{
e.write(self, sw);
}
catch (System.IO.IOException ioe)
{
self.error("can't evaluate separator expression", ioe);
}
return buf.ToString();
}
else
{
// just in case we expand in the future and it's something else
return separator.ToString();
}
}
public virtual ASTExpr parseAction(String action)
{
ActionLexer lexer = new ActionLexer(new System.IO.StringReader(action.ToString()));
ActionParser parser = new ActionParser(lexer, this);
parser.setASTNodeClass("antlr.stringtemplate.language.StringTemplateAST");
ASTExpr a = null;
try
{
IDictionary options = parser.action();
AST tree = parser.getAST();
if (tree != null)
{
if (tree.Type == ActionParser.CONDITIONAL)
{
a = new ConditionalExpr(this, tree);
}
else
{
a = new ASTExpr(this, tree, options);
}
}
}
catch (RecognitionException re)
{
error("Can't parse chunk: " + action.ToString(), re);
}
catch (TokenStreamException tse)
{
error("Can't parse chunk: " + action.ToString(), tse);
}
return a;
}
