static void GenerateTransformMethod(CodeTypeDeclaration templateType, TemplateSettings settings, ParsedTemplate pt, string templateFile, bool isOverride)
{
string baseDirectory = Path.GetDirectoryName(templateFile);
var transformMeth = Declare.Method("TransformText").Returns <string> ().AsVirtual();
if (isOverride)
{
transformMeth.AsOverride();
}
transformMeth.WithStatements(Expression.This.SetProperty("GenerationEnvironment", Expression.Null));
CodeExpression toStringHelper = settings.IsPreprocessed
? Expression.This.Property("ToStringHelper")
: TypeReference.Global(typeof(ToStringHelper)).AsExpression();
//method references that will need to be used multiple times
var writeMeth = Expression.This.Method("Write");
var toStringMeth = toStringHelper.Method("ToStringWithCulture");
bool helperMode = false;
//build the code from the segments
foreach (TemplateSegment seg in pt.Content)
{
CodeStatement st = null;
CodeLinePragma location = null;
if (!settings.NoLinePragmas)
{
var f = seg.StartLocation.FileName ?? templateFile;
if (!string.IsNullOrEmpty(f))
{
// FIXME: we need to know where the output file will be to make this work properly
if (settings.RelativeLinePragmas)
{
f = FileUtil.AbsoluteToRelativePath(baseDirectory, f);
}
else
{
f = Path.GetFullPath(f);
}
}
location = new CodeLinePragma(f, seg.StartLocation.Line);
}
switch (seg.Type)
{
case SegmentType.Block:
if (helperMode)
{
//TODO: are blocks permitted after helpers?
pt.LogError("Blocks are not permitted after helpers", seg.TagStartLocation);
}
st = Statement.Snippet(seg.Text);
break;
case SegmentType.Expression:
st = writeMeth.Invoke(toStringMeth.Invoke(Expression.Snippet(seg.Text))).AsStatement();
break;
case SegmentType.Content:
st = writeMeth.Invoke(Expression.Primitive(seg.Text)).AsStatement();
break;
case SegmentType.Helper:
if (!string.IsNullOrEmpty(seg.Text))
{
templateType.AddSnippetMember(seg.Text, location);
}
helperMode = true;
break;
default:
throw new InvalidOperationException();
}
if (st != null)
{
if (helperMode)
{
//convert the statement into a snippet member and attach it to the top level type
//TODO: is there a way to do this for languages that use indentation for blocks, e.g. python?
using (var writer = new StringWriter()) {
settings.Provider.GenerateCodeFromStatement(st, writer, null);
var text = writer.ToString();
if (!string.IsNullOrEmpty(text))
{
templateType.AddSnippetMember(text, location);
}
}
}
else
{
st.LinePragma = location;
transformMeth.Statements.Add(st);
continue;
}
}
}
transformMeth.WithStatements(Statement.Return(Expression.This.Property("GenerationEnvironment").InvokeMethod("ToString")));
templateType.AddMember(transformMeth);
}