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-rw-r--r--COPYING202
-rw-r--r--json-template.asd23
-rw-r--r--json-template.lisp150
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diff --git a/COPYING b/COPYING
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+
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diff --git a/json-template.asd b/json-template.asd
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+;; -*- mode: lisp; coding: utf-8 -*-
+;;
+;; Copyright 2011, Matthias Andreas Benkard.
+;;
+;; Licensed under the Apache License, Version 2.0 (the "License");
+;; you may not use this file except in compliance with the License.
+;; You may obtain a copy of the License at
+;;
+;; http://www.apache.org/licenses/LICENSE-2.0
+;;
+;; Unless required by applicable law or agreed to in writing, software
+;; distributed under the License is distributed on an "AS IS" BASIS,
+;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+;; See the License for the specific language governing permissions and
+;; limitations under the License.
+
+
+(asdf:defsystem json-template
+ :author "Matthias Andreas Benkard"
+ :description "An implementation of a subset of the JSON Template language."
+ :license "Apache License, version 2.0"
+ :version "0.1.0"
+ :components ((:file "json-template")))
diff --git a/json-template.lisp b/json-template.lisp
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+++ b/json-template.lisp
@@ -0,0 +1,150 @@
+;; -*- mode: lisp; coding: utf-8 -*-
+;;
+;; Copyright 2011, Matthias Andreas Benkard.
+;;
+;; Licensed under the Apache License, Version 2.0 (the "License");
+;; you may not use this file except in compliance with the License.
+;; You may obtain a copy of the License at
+;;
+;; http://www.apache.org/licenses/LICENSE-2.0
+;;
+;; Unless required by applicable law or agreed to in writing, software
+;; distributed under the License is distributed on an "AS IS" BASIS,
+;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+;; See the License for the specific language governing permissions and
+;; limitations under the License.
+
+
+(defpackage #:json-template
+ (:use #:common-lisp)
+ (:export #:parse-template-string
+ #:expand-template
+ #:*template-filters*))
+
+(in-package #:json-template)
+
+
+(defvar *template-filters*
+ `(;;("html" . filter-html)
+ ;;("html-attr-value" . filter-html-attr-value)
+ ("raw" . identity)))
+
+(defun tokenize-template-string (string)
+ (loop with in-command-p = nil
+ with position = 0
+ for terminator = (position (if in-command-p #\} #\{) string
+ :start position)
+ collect (cons in-command-p
+ (subseq string
+ position
+ (or terminator (length string))))
+ do (setq position (and terminator (1+ terminator))
+ in-command-p (not in-command-p))
+ until (null terminator)))
+
+(defun parse-template-string (stream)
+ (parse-raw-tokens (tokenize-template-string stream)))
+
+(defun parse-directive (string)
+ (let* ((space1 (position #\Space string))
+ (space2 (and space1 (position #\Space string :start (1+ space1)))))
+ (list (intern (string-upcase (subseq string 1 (or space1 (length string))))
+ '#:keyword)
+ (if space1
+ (subseq string (1+ space1) (or space2 (length string)))
+ nil)
+ (if space2
+ (subseq string (1+ space2))
+ nil))))
+
+(defun parse-variable (string)
+ (let ((pipe (position #\| string)))
+ (if pipe
+ (list (subseq string 0 pipe)
+ (subseq string (1+ pipe)))
+ (list string nil))))
+
+(defun parse-token (token)
+ (destructuring-bind (command-p . data)
+ token
+ (if command-p
+ (if (char= (char data 0) #\.)
+ (list* :directive (parse-directive data))
+ (list* :variable (parse-variable data)))
+ (list :text data))))
+
+(defun parse-raw-tokens (tokens)
+ (parse-tokens (mapcar #'parse-token tokens)))
+
+(defun parse-tokens (tokens)
+ (let ((result (loop for token = (and tokens (car tokens))
+ for token-kind = (first token)
+ for token-data = (rest token)
+ until (or (null tokens)
+ (and (eq token-kind :directive)
+ (member (second token) '(:or :end))))
+ do (setq tokens (cdr tokens))
+ if (eq token-kind :directive)
+ collect (multiple-value-bind (subresult rest-tokens)
+ (parse-tokens tokens)
+ (let ((sub-end-tag (first rest-tokens)))
+ (setq tokens (rest rest-tokens))
+ (let ((alternative
+ (and (equal sub-end-tag '(:directive :or nil nil))
+ (multiple-value-bind (altresult rest-tokens2)
+ (parse-tokens tokens)
+ (setq tokens (rest rest-tokens2))
+ altresult))))
+ (ecase (first token-data)
+ (:section
+ (list :section
+ (second token-data)
+ subresult
+ alternative))
+ (:repeated
+ (list :repeated-section
+ (third token-data)
+ subresult
+ alternative))))))
+ else if (member token-kind '(:variable :text))
+ collect token
+ else do (error "Encountered invalid token: ~S" token))))
+ (values result tokens)))
+
+(defun expand-template (template context)
+ (with-output-to-string (out)
+ (expand-template-to-stream template context out)))
+
+(defun expand-template-to-stream (template context stream)
+ (dolist (thing template)
+ (ecase (first thing)
+ (:text
+ (write-string (second thing) stream))
+ (:variable
+ (destructuring-bind (variable filter) (cdr thing)
+ (let ((value (getf context
+ (intern (string-upcase variable)
+ '#:keyword)
+ nil)))
+ (format stream "~A"
+ (if filter
+ (funcall (cdr (assoc filter *template-filters*))
+ value)
+ value)))))
+ (:section
+ (destructuring-bind (section branch alternative) (cdr thing)
+ (let ((value (getf context (intern (string-upcase section) '#:keyword) nil)))
+ (expand-template-to-stream (if value branch alternative)
+ value
+ stream))))
+ (:repeated-section
+ (destructuring-bind (section branch alternative) (cdr thing)
+ (let ((value (if (string= section "@")
+ context
+ (getf context (intern (string-upcase section) '#:keyword)
+ nil))))
+ (if value
+ (mapc (lambda (ctx)
+ (expand-template-to-stream branch ctx stream))
+ value)
+ (expand-template-to-stream alternative value stream))))))))