added arbitrary expression inversion, lookforward, and syntax for lookback

[sbp.git] / tests / meta.g

diff --git a/tests/meta.g b/tests/meta.g
index 5b69051..884f2aa 100644 (file)
--- a/tests/meta.g
+++ b/tests/meta.g
@@ -1,69 +1,59 @@
 s         ::=  ws grammar ws                  => "gram"
-ws       !::=  w**
-grammar   ::=  r $$ ws => "grammar"
+ws       !::=  w** | w** "//" (~[\n]*) "\n" ws
+wp       !::=  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
-
-ss ::= es | es ^"/" e /ws
-
-conjuncts   ::=  rewrite
-              |  rewrite ^"&"  e%%ws   /ws
-              |  rewrite ^"&~" e%%ws   /ws
-
-rewrite  ::=  sequence                  /ws        => "rewrite"
-           |  sequence ^"=>" word       /ws
-           |  sequence ^"=>" quoted     /ws
-           |  sequence  "=>" "()"       /ws        => "wrap"
-
-ec       ::= [~\-\]\\\~]
+alternatives  ::=  (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)? => "ps2"
+psy        ::= ps
+             | ps wp ^"/" ws e
+psx        ::= psy                   => "psy"
+             | e "<-" psy        /ws => "psyl"
+             |        psy "->" e /ws => "psyr"
+             | e "<-" psy "->" e /ws => "psylr"
+sequence   ::= quoted => "qprod"
+             > psx
+             | psx ^"=>" (word|quoted) /ws
+
+ec       ::= ~[\-\]\\]
            | escaped
 
-range    ::= ec          => "range0"
-           | ec ^"-" ec  => "range1"
+range    ::= ec          => "range"
+           | ec ^"-" ec
 
-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
+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 ^"**" > e ws ^"*")
-           |  (e ws ^"++" > e ws ^"+")
-
-           |     "(" word ^")"          /ws
-           >    ^"(" alternatives ")"   /ws
-
-ranges ::= range*
+           |     "(" word         ^")"  /ws
+           >    ^"(" alternatives  ")"  /ws
+           |    ^"~" e
 
 w       !::= " "
-           | "//" [~\n]* "\n"
            | "\n"
            | "\r"
-an       ::= [a-zA-Z0-9_]
-word     ::= an++                           => "sify"
-quoted   ::= "\"" ([~\"\\] | escaped)* "\"" => "sify"
+word     ::= [a-zA-Z0-9_]++
+quoted   ::= "\"" ((~[\"\\] | escaped)+) "\""
+           | "\"\"" => ""
 escaped  ::= "\\n" => "\n"
            | "\\r" => "\r"
-           | "\\" [~nr]
+           | "\\" ~[nr]