factor/basis/html/templates/fhtml/fhtml.factor

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! Copyright (C) 2005 Alex Chapman
! Copyright (C) 2006, 2009 Slava Pestov
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! See http://factorcode.org/license.txt for BSD license.
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USING: continuations sequences kernel namespaces debugger
combinators math quotations generic strings splitting accessors
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assocs fry vocabs.parser parser parser.notes lexer io io.files
io.streams.string io.encodings.utf8 html.templates compiler.units ;
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IN: html.templates.fhtml
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! We use a custom lexer so that %> ends a token even if not
! followed by whitespace
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TUPLE: template-lexer < lexer ;
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: <template-lexer> ( lines -- lexer )
template-lexer new-lexer ;
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M: template-lexer skip-word
[
{
{ [ 2dup nth CHAR: " = ] [ drop 1 + ] }
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{ [ 2dup swap tail-slice "%>" head? ] [ drop 2 + ] }
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[ f skip ]
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} cond
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] change-lexer-column ;
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DEFER: <% delimiter
: check-<% ( lexer -- col )
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"<%" over line-text>> rot column>> start* ;
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: found-<% ( accum lexer col -- accum )
[
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over line-text>>
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[ column>> ] 2dip subseq parsed
\ write parsed
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] 2keep 2 + >>column drop ;
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: still-looking ( accum lexer -- accum )
[
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[ line-text>> ] [ column>> ] bi tail
parsed \ print parsed
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] keep next-line ;
: parse-%> ( accum lexer -- accum )
dup still-parsing? [
dup check-<%
[ found-<% ] [ [ still-looking ] keep parse-%> ] if*
] [
drop
] if ;
SYNTAX: %> lexer get parse-%> ;
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: parse-template-lines ( lines -- quot )
<template-lexer> [
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V{ } clone lexer get parse-%> f (parse-until) >quotation
] with-lexer ;
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: parse-template ( string -- quot )
[
[
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"quiet" on
parser-notes off
"html.templates.fhtml" use-vocab
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string-lines parse-template-lines
] with-file-vocabs
] with-compilation-unit ;
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: eval-template ( string -- )
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parse-template call( -- ) ;
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TUPLE: fhtml path ;
C: <fhtml> fhtml
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M: fhtml call-template* ( filename -- )
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[ path>> utf8 file-contents eval-template ] call( filename -- ) ;
INSTANCE: fhtml template