checkpoint

[sbp.git] / tests / meta.g

diff --git a/tests/meta.g b/tests/meta.g
index 1a97296..807f15f 100644 (file)
--- a/tests/meta.g
+++ b/tests/meta.g
@@ -1,68 +1,59 @@
-s         ::=  ws grammar ws                  => "gram"
-ws       !::=  w**
-grammar   ::=  r $$ ws => "grammar"
-r         ::=  word  ^"::=" alternatives /ws
-            |  word ^"!::=" alternatives /ws
-
-alternatives  ::=  equiAlt   $$ (ws ">" ws)
-equiAlt       ::=  conjuncts $$ (ws "|" ws)          => "alternatives"
-
-sequence    ::= Es
-              > Es ^"/" e  /ws
-Es          ::= e+
-es          ::= e %% ws
-
-
-conjuncts   ::=  rewrite
-              |  rewrite ^"&"  sequence   /ws
-              |  rewrite ^"&~" sequence   /ws
-
-rewrite  ::=  sequence                  /ws        => "rewrite"
-           |  sequence ^"=>" word       /ws
-           |  sequence ^"=>" quoted     /ws
-           |  sequence  "=>" "()"       /ws        => "wrap"
-
-ec       ::= [~\-\]\\\~]
-           | escaped
-
-range    ::= ec          => "range0"
-           | ec ^"-" ec  => "range1"
-
-e        ::= word                             => "nonTerminalY"
-           |    [(][)] => "epsilon"
-           |    ^"{" alternatives "}"   /ws
-           |     "["  ranges "]"        => "range"
-           |     "[~" ranges "]"        => "rangex"
-           |  e ^"%%" e                 /ws
-           |  e ^"$$" e                 /ws
-           |  e ^"?"                    /ws
-           |  e ^"~/~"                  /ws
-
-           |  e ^"-"  e                 /ws
-
-           |    ^"!" e                  /ws
-           |     "^" quoted             /ws => "care"
-           |    ^"`" e                  /ws
-           |  e ^"#"                    /ws
-           |  quoted                        => "literal"
-
-           |  (e ws ^"**" > e ws ^"*")
-           |  (e ws ^"++" > e ws ^"+")
-
-           |     "(" word ^")"          /ws
-           >    ^"(" alternatives ")"   /ws
-
-ranges ::= range*
-
-w       !::= " "
-           | "//" [~\n]* "\n"
-           | "\n"
-           | "\r"
-an       ::= [a-zA-Z0-9_]
-word     ::= an++                           => "sify"
-quoted   ::= "\"" ([~\"\\] | escaped)* "\"" => "sify"
+s           ::=  !ws Grammar ws              => "gram"
+Grammar     ::=  NonTerminal +/ ws           => "grammar"
+NonTerminal ::=  word  ^"::=" RHS /ws
+
+RHS         ::=  (Conjuncts +/ (!ws "|" !ws)) +/ (!ws ">" !ws)
+
+Conjuncts   ::=  Sequence
+              |  Sequence ^"&"  Elements  /ws
+              |  Sequence ^"&~" Elements  /ws
+Elements    ::=  e*/ws
+
+PreSequence ::= Elements => "ps"
+              | PreSequence !wp ^"/"  !ws e
+              | PreSequence     ^"->"     e /ws
+              | (Quoted|word)   ^"::" PreSequence /ws
+              | PreSequence     ^"=>" ("[]"|"()"|word|Quoted) /ws
+Sequence    ::= PreSequence    => "psx"
+
+ec          ::= ~[\-\]\\]
+              | escaped
+
+Range       ::= ec          => "range"
+              | ec ^"-" ec
+
+e           ::=
+                (Quoted|word) ^":" 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
+              |    ^"^" Quoted             /ws
+
+              |     "(" word         ^")"  /ws
+              >    ^"(" RHS  ")"           /ws
+              |    ^"~" e
+
+word     ::= [a-zA-Z0-9_]++
+Quoted   ::= "\"" ((~[\"\\] | escaped)+) "\""
+           | "\"\"" => ""
 escaped  ::= "\\n" => "\n"
            | "\\r" => "\r"
-           | "\\" [~nr]
+           | "\\" ~[nr]
 
 
+w           ::= " " | "\n" | "\r"
+ws          ::=  w** => ()
+              |  w** "//" ~[\n]* "\n" ws => ()
+wp          ::=  w++