From 408d592c3e267743f6ded0b37c5eb72ef92c2ae6 Mon Sep 17 00:00:00 2001
From: "Jose A. Ortega Ruiz" <jao@gnu.org>
Date: Wed, 1 Apr 2009 05:03:28 +0200
Subject: [PATCH] FUEL: Font lock and no indentation for EBNF: ... ;EBNF forms.

---
 extra/peg/pl0/pl0.factor    | 22 +++++++++++-----------
 misc/fuel/fuel-font-lock.el |  7 ++++++-
 misc/fuel/fuel-syntax.el    |  4 +++-
 3 files changed, 20 insertions(+), 13 deletions(-)

diff --git a/extra/peg/pl0/pl0.factor b/extra/peg/pl0/pl0.factor
index eff923dc01..179e03f1cf 100644
--- a/extra/peg/pl0/pl0.factor
+++ b/extra/peg/pl0/pl0.factor
@@ -6,20 +6,20 @@ IN: peg.pl0
 
 #! Grammar for PL/0 based on http://en.wikipedia.org/wiki/PL/0
 
-EBNF: pl0 
+EBNF: pl0
 
-block       =  { "CONST" ident "=" number { "," ident "=" number }* ";" }? 
-               { "VAR" ident { "," ident }* ";" }? 
-               { "PROCEDURE" ident ";" { block ";" }? }* statement 
-statement   =  {  ident ":=" expression 
-                | "CALL" ident 
-                | "BEGIN" statement { ";" statement }* "END" 
-                | "IF" condition "THEN" statement 
-                | "WHILE" condition "DO" statement }?  
+block       =  { "CONST" ident "=" number { "," ident "=" number }* ";" }?
+               { "VAR" ident { "," ident }* ";" }?
+               { "PROCEDURE" ident ";" { block ";" }? }* statement
+statement   =  {  ident ":=" expression
+                | "CALL" ident
+                | "BEGIN" statement { ";" statement }* "END"
+                | "IF" condition "THEN" statement
+                | "WHILE" condition "DO" statement }?
 condition   =  { "ODD" expression }
              | { expression ("=" | "#" | "<=" | "<" | ">=" | ">") expression }
-expression  = {"+" | "-"}? term { {"+" | "-"} term }* 
-term        = factor { {"*" | "/"} factor }* 
+expression  = {"+" | "-"}? term { {"+" | "-"} term }*
+term        = factor { {"*" | "/"} factor }*
 factor      = ident | number | "(" expression ")"
 ident       = (([a-zA-Z])+)   => [[ >string ]]
 digit       = ([0-9])         => [[ digit> ]]
diff --git a/misc/fuel/fuel-font-lock.el b/misc/fuel/fuel-font-lock.el
index 5961d9e86f..bc1bb900ce 100644
--- a/misc/fuel/fuel-font-lock.el
+++ b/misc/fuel/fuel-font-lock.el
@@ -58,6 +58,7 @@
   (number constant  "integers and floats")
   (ratio constant  "ratios")
   (declaration keyword "declaration words")
+  (ebnf-form constant "EBNF: ... ;EBNF form")
   (parsing-word keyword  "parsing words")
   (setter-word function-name "setter words (>>foo)")
   (getter-word function-name "getter words (foo>>)")
@@ -75,7 +76,9 @@
 (defun fuel-font-lock--syntactic-face (state)
   (if (nth 3 state) 'factor-font-lock-string
     (let ((c (char-after (nth 8 state))))
-      (cond ((or (char-equal c ?\ ) (char-equal c ?\n))
+      (cond ((or (char-equal c ?\ )
+                 (char-equal c ?\n)
+                 (char-equal c ?E))
              (save-excursion
                (goto-char (nth 8 state))
                (beginning-of-line)
@@ -85,6 +88,8 @@
                       'factor-font-lock-symbol)
                      ((looking-at-p "C-ENUM:\\( \\|\n\\)")
                       'factor-font-lock-constant)
+                     ((looking-at-p "E")
+                      'factor-font-lock-ebnf-form)
                      (t 'default))))
             ((or (char-equal c ?U) (char-equal c ?C))
              'factor-font-lock-parsing-word)
diff --git a/misc/fuel/fuel-syntax.el b/misc/fuel/fuel-syntax.el
index 4cff58ae3b..7aba6282d6 100644
--- a/misc/fuel/fuel-syntax.el
+++ b/misc/fuel/fuel-syntax.el
@@ -48,7 +48,7 @@
     "B" "BIN:"
     "C:" "C-ENUM:" "C-STRUCT:" "C-UNION:" "CHAR:" "CONSTANT:" "call-next-method"
     "DEFER:"
-    "ERROR:" "EXCLUDE:"
+    "EBNF:" ";EBNF" "ERROR:" "EXCLUDE:"
     "f" "FORGET:" "FROM:" "FUNCTION:"
     "GENERIC#" "GENERIC:"
     "HELP:" "HEX:" "HOOK:"
@@ -254,6 +254,8 @@
     ("\\_<<\\(\"\\)\\_>" (1 "<b"))
     ("\\_<\\(\"\\)>\\_>" (1 ">b"))
     ;; Multiline constructs
+    ("\\_<\\(E\\)BNF:\\( \\|\n\\)" (1 "<b"))
+    ("\\_<;EBN\\(F\\)\\_>" (1 ">b"))
     ("\\_<\\(U\\)SING: \\(;\\)" (1 "<b") (2 ">b"))
     ("\\_<USING:\\( \\)" (1 "<b"))
     ("\\_<\\(C\\)-ENUM: \\(;\\)" (1 "<b") (2 ">b"))