Unterschiede

Hier werden die Unterschiede zwischen zwei Versionen angezeigt.

--- ebnf:index [2009/04/09 13:50] – Vincent Tscherter
+++ ebnf:index [2025/09/06 10:14] (aktuell) – Vincent Tscherter
@@ Zeile 1: / Zeile 1: @@
+====== EBNF Parser & Syntax Diagram Renderer ======
+The //EBNF Parser & Syntax Diagram Renderer// can be used stand-alone or as Dokuwiki-Plugin.
+===== Download and Install=====
+  * https://www.dokuwiki.org/plugin:ebnf
+  * Requirements: Make sure to have the [[http://www.php.net/manual/en/image.requirements.php|GD library]] ready :!:
+===== How to use =====
+  <ebnf> "EBNF defined in itself" {
+  syntax     = [ title ] "{" { production } "}" [ comment ].
+  production = identifier "=" expression ( "." | ";" ) .
+  expression = term { "|" term } .
+  term       = factor { factor } .
+  factor     = identifier
+             | literal
+             | "[" expression "]"
+             | "(" expression ")"
+             | "{" expression "}" .
+  identifier = character { character } .
+  title      = literal .
+  comment    = literal .
+  literal    = "'" character { character } "'"
+             | '"' character { character } '"' .
+  }</ebnf>
+<ebnf> "EBNF defined in itself" {
+  syntax     = [ title ] "{" { production } "}" [ comment ].
+  production = identifier "=" expression ( "." | ";" ) .
+  expression = term { "|" term } .
+  term       = factor { factor } .
+  factor     = identifier
+             | literal
+             | "[" expression "]"
+             | "(" expression ")"
+             | "{" expression "}" .
+  identifier = character { character } .
+  title      = literal .
+  comment    = literal .
+  literal    = "'" character { character } "'"
+             | '"' character { character } '"' .
+} </ebnf>
+The script is also available as stand-alone version under: ''your_dokuwiki/lib/plugins/ebnf/ebnf.php''
+  .../ebnf.php?syntax="EBNF"{ hello = "Hello World". }"Some additional Comments"
+Note: The stand-alone script supports also XML output
+  .../ebnf.php?syntax={ hello = "EBNF Hello World in XML". }&format=xml
+===== Syntax =====
+  * See examples: [[examples]]
+  * [[wp>EBNF]]
+  * [[wp>Wirth_syntax_notation]]
+===== Todo & Ideas =====
+  * Ellipse ... for enumerations. E.g. ''digits'':
+    * temp hack in v0.2: ''function render_node($node, $lefttoright)''<code php> ...
+    else {
+      if ($text!="...")
+	      rr($im, UNIT, 0, $w-UNIT-1, $h-1, UNIT/2, $black);
+      imagestring($im, FONT, 2*UNIT, ($h-imagefontheight(FONT))/2,
+        $text, $text!="..."?$blue:$black);
+    } ...</code>
+  * Other fonts
+  * Configurable dimensions
+  * escape-chars and or unicode in terminals
+  * Adding //Regexp// beside terminal and identifiers
+  * using a lightweight syntaxtree instead DOM
+  * using some standard parsing mechanism
+  * support for comments & special-sequences ''? ... ?''
+  * http://www.cs.man.ac.uk/~pjj/bnf/ebnf.html
+  * replace antialias function