checkpoint

[sbp.git] / tests / meta.g

diff --git a/tests/meta.g b/tests/meta.g
index b1fb352..17f0399 100644 (file)
--- a/tests/meta.g
+++ b/tests/meta.g
@@ -1,61 +1,73 @@
-s           ::=  Grammar ws                  => "gram"
-Grammar     ::=  NonTerminal +/ ws           => "grammar"
-NonTerminal ::=  word  ^"::=" RHS /ws
-
-w        ::= " " | "\n" | "\r"
-ws        ::=  w** => ()
-            |  w** "//" (~[\n]*) "\n" ws => ()
-wp        ::=  w++
-
-RHS        ::=  (Conjuncts +/ (!ws "|" !ws)) +/ (!ws ">" !ws)
-
-Conjuncts  ::=  Sequence
-             |  Sequence ^"&"  e*/ws   /ws
-             |  Sequence ^"&~" e*/ws   /ws
-
-ps         ::= e*/ws                              => "ps"
-             | (e+/ws !ws)? ^"^" Quoted (!ws e+/ws)?
-psy        ::= ps
-             | ps !wp ^"/" !ws e
-psx        ::= psy                   => "psy"
-             | psy ^"->" e /ws
-Sequence   ::= Quoted => "qprod"
-             > psx => "psx"
-             | psx  "=>" ^"[]"         /ws
-             | psx ^"=>" ("()"|word|Quoted) /ws
-
-ec       ::= ~[\-\]\\]
-           | escaped
-
-Range    ::= ec          => "range"
-           | ec ^"-" ec
-
-e        ::=  word                          => "nonTerminal"
-           |  Quoted                        => "literal"
-           |    ^"()"
-           |    ^"{" Sequence "}"       /ws
-           |    ^"["  Range* "]"
-
-           |  e ^"++"                   /ws -> ~[/]
-           |  e ^"+"                    /ws -> ~[+]
-           |  e ^"++/" e                /ws        
-           |  e ^"+/"  e                /ws        
-           |  e ^"**"                   /ws -> ~[/]
-           |  e ^"*"                    /ws -> ~[*]
-           |  e ^"**/" e                /ws        
-           |  e ^"*/"  e                /ws        
-           |  ^"!" e                    /ws
-           |  e ^"?"                    /ws
-
-           |     "(" word         ^")"  /ws
-           >    ^"(" RHS  ")"           /ws
-           |    ^"~" e
-
-word     ::= [a-zA-Z0-9_]++
-Quoted   ::= "\"" ((~[\"\\] | escaped)+) "\""
-           | "\"\"" => ""
-escaped  ::= "\\n" => "\n"
-           | "\\r" => "\r"
-           | "\\" ~[nr]
+// use 'a'-'z' or 'a-z' instead of [a-z]?
+// EOF token?
+// #include (with renaming?)
 
+s             =  ws! Grammar ws!
 
+Grammar       =  Declaration +/ ws
+
+Declaration   =  NonTerminal
+              |  ^"#import" ws! FileName (ws! "as" ws! Word)?
+
+FileName      = FileNameChar+ -> [\r\n ]
+FileNameChar  = Space:: "\\ "
+              | ~[\r\n ]
+
+NonTerminal   =  Word           "="     RHS /ws
+              |  Word  "*" ws! ^"=" ws! RHS
+              |  Word  "*/" Word ws! ^"=" ws! RHS
+       
+RHS           =  (Sequence +/ (ws! "|" ws!)) +/ (ws! ">" ws!)
+
+Elements      =  e*/ws
+
+PreSequence   =  Elements
+              |  (Quoted|Word)   ^"::" PreSequence /ws
+              >  PreSequence     ^"/"      e       /ws
+              |  PreSequence     ^"->"     e       /ws
+
+Sequence      = psx:: PreSequence
+              |       Sequence ^"&"  Elements /ws
+              |       Sequence ^"&~" Elements /ws
+
+ec            = ~[\-\]\\]
+              | escaped
+
+Range         = ec
+              | ec "-" ec
+
+e             =                (Quoted|Word) ^":" e
+              >                NonTerminalReference
+              |                Literal
+              |                  ^"()"
+              |                  ^"{" PreSequence "}"    /ws
+              |                  ^"["  Range* "]"
+              |                e ^"++"                   /ws -> ~[/]
+              |                e ^"+"                    /ws -> ~[+]
+              |                e ^"++/" e                /ws        
+              |                e ^"+/"  e                /ws        
+              |                e ^"**"                   /ws -> ~[/]
+              |                e ^"*"                    /ws -> ~[*]
+              |                e ^"**/" e                /ws        
+              |                e ^"*/"  e                /ws        
+              |                     e ^"!"
+              |                e ^"?"                    /ws
+              |                  ^"^"   Quoted
+              >                  ^"(" RHS  ")"           /ws
+              |                  ^"~" e
+
+NonTerminalReference = Word
+Literal              = Quoted
+Word                 = [.a-zA-Z0-9_]++
+Quoted               = "\"" ((~[\"\\] | escaped)+) "\""
+                     | EmptyString
+                       EmptyString = "\"\""
+
+escaped    = "\n":: "\\n"
+           | "\r":: "\\r"
+           |        "\\" ~[nr]
+
+w             = " " | "\n" | "\r"
+ws            =  w**
+              |  w** "//" (~[\n])*! "\n" ws!
+wp            =  w++