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<p class=MsoPlainText>You have a lot of useful info there. Out of curiosity, I’m
wondering how fast this type of code would be. It works with the debugger and
IntelliSense tools better.<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas;color:blue'>public<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas;color:slateblue'>ifConditionFunctional</span><span
style='font-size:8.0pt;font-family:Consolas'> <span style='color:blue'>returns</span>
[System.Func<ASTExpr,StringTemplate,IStringTemplateWriter,bool> func]<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas'> : <span style='color:slateblue'>ifAtomFunctional<o:p></o:p></span></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas'> {$func = $ifAtomFunctional.func;}<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas'> | ^(<span style='color:navy'>NOT</span> <span
style='color:slateblue'>ifAtomFunctional</span>)<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas'> {$func = (chunk,self,writer) =>
!($ifAtomFunctional.func(chunk,self,writer));}<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas'> ;<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas;color:slateblue'>ifAtomFunctional</span><span
style='font-size:8.0pt;font-family:Consolas'> <span style='color:blue'>returns</span>
[System.Func<ASTExpr,StringTemplate,IStringTemplateWriter,bool> func]<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas'> : <span style='color:slateblue'>exprFunctional<o:p></o:p></span></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas'> {$func = (chunk,self,writer) =>
chunk.TestAttributeTrue($exprFunctional.func(chunk,self,writer));}<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas'> ;<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas;color:slateblue'>exprFunctional</span><span
style='font-size:8.0pt;font-family:Consolas'> <span style='color:blue'>returns</span>
[System.Func<ASTExpr,StringTemplate,IStringTemplateWriter,object> func]<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas'> : ^(<span style='color:navy'>PLUS</span> <span
style='color:slateblue'>a</span>=<span style='color:slateblue'>exprFunctional</span>
<span style='color:slateblue'>b</span>=<span style='color:slateblue'>exprFunctional</span>)<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas'> {$func = (chunk,self,writer) =>
chunk.Add($a.func(chunk,self,writer),$b.func(chunk,self,writer));}<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas'> | <span style='color:slateblue'>templateApplicationFunctional<o:p></o:p></span></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas'> {$func =
$templateApplicationFunctional.func;}<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas'> | <span style='color:slateblue'>attributeFunctional<o:p></o:p></span></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas'> {$func = $attributeFunctional.func;}<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas'> | <span style='color:slateblue'>templateIncludeFunctional<o:p></o:p></span></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas'> {$func =
$templateIncludeFunctional.func;}<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas'> | <span style='color:slateblue'>functionFunctional<o:p></o:p></span></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas'> {$func = $functionFunctional.func;}<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas'> | <span style='color:slateblue'>listFunctional<o:p></o:p></span></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas'> {$func = $listFunctional.func;}<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas'> | ^(<span style='color:navy'>VALUE</span> <span
style='color:slateblue'>a</span>=<span style='color:slateblue'>exprFunctional</span>)<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas'> {<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas'> $func = (chunk,self,writer) =><o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas'> {<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas'> var value =
$a.func(chunk,self,writer);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas'> StringWriter buf
= new StringWriter();<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas'> IStringTemplateWriter
sw = self.Group.GetStringTemplateWriter( buf );<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas'> int n =
chunk.WriteAttribute( self, value, sw );<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas'> if ( n > 0 )<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas'> return
buf.ToString();<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas'> return value;<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas'> };<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas'> }<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:Consolas'> ;<o:p></o:p></span></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Sam<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>-----Original Message-----<br>
From: stringtemplate-interest-bounces@antlr.org
[mailto:stringtemplate-interest-bounces@antlr.org] On Behalf Of Volkan Ceylan<br>
Sent: Thursday, March 19, 2009 3:24 AM<br>
To: stringtemplate-interest@antlr.org<br>
Subject: Re: [stringtemplate-interest] StringTemplate Compiler for .NET<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>> So here we go/you’ve inspired me. :) For syntax
highlighting, view in HTML.<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Wouv i'm glad, thats great, ;)<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>I still don't have access to repository and can't see
actual code.<o:p></o:p></p>
<p class=MsoPlainText>Prof. Parr could you please set up a readonly account for
me to access<o:p></o:p></p>
<p class=MsoPlainText>ST#3 code?<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Btw, it would be great if expressions are compiled during
parsing. As<o:p></o:p></p>
<p class=MsoPlainText>i didn't want to modify ST code myself, i choosed another
way. I'm<o:p></o:p></p>
<p class=MsoPlainText>creating a set of dynamic methods/CompiledTemplate
objects given a set<o:p></o:p></p>
<p class=MsoPlainText>of StringTemplate/StringTemplateGroup objects. So when
the template is<o:p></o:p></p>
<p class=MsoPlainText>going to be converted to string with a new set of
attributes by means<o:p></o:p></p>
<p class=MsoPlainText>of compiledTemplate.GetInstanceOf().ToString(), there
won't be any<o:p></o:p></p>
<p class=MsoPlainText>dynamic compilation at this stage, just calls to dynamic
methods. You<o:p></o:p></p>
<p class=MsoPlainText>are not generating dynamic methods on evaluation stage
each time a<o:p></o:p></p>
<p class=MsoPlainText>template instance is converted to string, do you? It
would be very<o:p></o:p></p>
<p class=MsoPlainText>slow, because of the way ILGenerator works (probably you
don't, i<o:p></o:p></p>
<p class=MsoPlainText>couldn't have enough time to review code yet).<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>I would like to point in some performance bottlenecks
that i<o:p></o:p></p>
<p class=MsoPlainText>discovered during my development. Might be helpful if you
are planning<o:p></o:p></p>
<p class=MsoPlainText>to keep on doing compilations / optimizations.<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>- Anonymous templates (and most named templates) usually
only have one<o:p></o:p></p>
<p class=MsoPlainText>(or none) argument, "it" or a named variant of
it e.g. "x". And there<o:p></o:p></p>
<p class=MsoPlainText>is also<o:p></o:p></p>
<p class=MsoPlainText>"i" and "i0" special variables. Even
when a template access only these<o:p></o:p></p>
<p class=MsoPlainText>attributes, a dictionary lookup is still required. And
dictionary<o:p></o:p></p>
<p class=MsoPlainText>lookup is slow (yes O(1) but still 10x slower than a
direct variable<o:p></o:p></p>
<p class=MsoPlainText>lookup). They should be treated specially in special
template<o:p></o:p></p>
<p class=MsoPlainText>variables. I did this for compiled templates and it
helped a lot.<o:p></o:p></p>
<p class=MsoPlainText>Templates with a single argument can also be treated
specially.<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>- Options like separator, format, null, anchor etc. are
all string<o:p></o:p></p>
<p class=MsoPlainText>templates, even when they just contains of a constant
simple string<o:p></o:p></p>
<p class=MsoPlainText>(And most of the time like %99 they are constants). When
they are<o:p></o:p></p>
<p class=MsoPlainText>constants, they should also be treated specially.<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>- There is a list called EmbeddedInstances in each
StringTemplate.<o:p></o:p></p>
<p class=MsoPlainText>This list is not used anywhere, grows each time a
template is<o:p></o:p></p>
<p class=MsoPlainText>converted to a string and it prevents garbage collection
of template<o:p></o:p></p>
<p class=MsoPlainText>instances. Don't know if your port has them, but if it
does, should be<o:p></o:p></p>
<p class=MsoPlainText>removed.<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>- ASTExpr.ApplyListOfAlternatingTemplates is called even
when there is<o:p></o:p></p>
<p class=MsoPlainText>only one template and it has array lookup/modulus
overheads. Also it<o:p></o:p></p>
<p class=MsoPlainText>creates an array of templates for each element and
returns that array<o:p></o:p></p>
<p class=MsoPlainText>as results may be applied to another template, but most
of the time<o:p></o:p></p>
<p class=MsoPlainText>they don't. May be optimized by looking ahead in the
expression tree<o:p></o:p></p>
<p class=MsoPlainText>to see if there is an upcoming template application.<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Volkan Ceylan<o:p></o:p></p>
<p class=MsoPlainText>_______________________________________________<o:p></o:p></p>
<p class=MsoPlainText>stringtemplate-interest mailing list<o:p></o:p></p>
<p class=MsoPlainText>stringtemplate-interest@antlr.org<o:p></o:p></p>
<p class=MsoPlainText>http://www.antlr.org/mailman/listinfo/stringtemplate-interest<o:p></o:p></p>
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