commit 91c3b555a1c4f478497d7251811ce1b43ccc5444
parent 5d246ce9328e218e994274064d2ff11a3a029f64
Author: Jan Dankert <develop@jandankert.de>
Date: Tue, 7 Jun 2022 23:12:47 +0200
Fetched from upstream and enhanced documentation.
Diffstat:
2 files changed, 91 insertions(+), 2 deletions(-)
diff --git a/README.md b/README.md
@@ -150,9 +150,45 @@ Example
+## Template script
+
+Remember Smarty and Twig? Yes, but both have their strange syntax. Check out this template parser with a JSP-like syntax:
+
+ <html>
+ <body>
+ <% age = 12; %>
+ Next year your age is <%= (age+1) %></br>
+
+
+### Usage
+
+ // Parse the template, this will create a plain script
+ $templateParser = new DslTemplate();
+ $templateParser->parseTemplate($src);
+
+ // That's all. Lets start the interpreter
+ $executor = new DslInterpreter();
+ $executor->runCode($templateParser->script);
+ echo( $executor->getOutput() ); // get the output
+
+
## Unsupported
- There is NO support for creating classes or objects.
- Due to the request-based operation of the PHP interpreter there is no possibility for asynchronous methods like `async` or `await`.
- No try/catch
-- No `window`, `document` or `navigator` objects
-\ No newline at end of file
+- No `window`, `document` or `navigator` objects
+
+## FAQ
+
+_Does it generate PHP code?_
+
+No. The Interpreter works in memory. There is no way to create PHP code, even if it would be possible to implement.
+
+_Is it slow?_
+
+Yes, maybe, because there is no cache and no compilation to native PHP code. But this scriptbox targets content management systems which have their own caching.
+
+_Why did you do this?_
+
+Because it was possible ;) And I needed a sandboxed DSL (domain specific language) for my CMS.
+\ No newline at end of file
diff --git a/dsl/DslTemplate.class.php b/dsl/DslTemplate.class.php
@@ -0,0 +1,52 @@
+<?php
+
+
+namespace dsl;
+
+
+class DslTemplate
+{
+ public $tagsFound = 0;
+ public $script = null;
+
+ public function parseTemplate( $source ) {
+
+ $this->script = '';
+ $this->tagsFound = 0;
+
+ while( true ) {
+
+ $tagOpen = strpos( $source,'<%' );
+
+ if ( $tagOpen !== false ) {
+ $this->tagsFound++;
+ $this->addWriteCommand(substr($source,0,$tagOpen),true);
+ $source = substr($source,$tagOpen+2);
+ $tagClose = strpos( $source,'%>' );
+ if ( $tagClose === false )
+ throw new DslParserException('Unclosed script tag');
+ $code = substr($source,0,$tagClose);
+ if ( $code[0] == '=' )
+ $this->addWriteCommand( substr($code,1) );
+ else
+ $this->script .= $code."\n";
+
+ $source = substr($source,$tagClose+2);
+ }
+ else{
+ $this->addWriteCommand($source,true);
+ break;
+ }
+ }
+ }
+
+ protected function addWriteCommand( $code, $quote = false ) {
+
+ if ( $quote )
+ foreach ( explode("\n",$code) as $line)
+ $this->script .= 'write(\''.str_replace('\'','\\\'',$line).'\');'."\n";
+ else
+ $this->script .= 'write('.$code.');'."\n";
+
+ }
+}
+\ No newline at end of file
