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| -rw-r--r-- | COPYING | 202 | ||||
| -rw-r--r-- | json-template.asd | 23 | ||||
| -rw-r--r-- | json-template.lisp | 150 |
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+;; 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 new file mode 100644 index 0000000..59e1265 --- /dev/null +++ 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)))))))) |