checkpoint

[sbp.git] / tests / meta.g

diff --git a/tests/meta.g b/tests/meta.g
index 5723e6d..807f15f 100644 (file)
--- a/tests/meta.g
+++ b/tests/meta.g
@@ -1,52 +1,59 @@
-s         ::=  ws grammar ws                  => "gram"
-ws       !::=  w**
-grammar   ::=  r +/ ws                        => "grammar"
-r         ::=  word  ^"::=" alternatives /ws
-            |  word ^"!::=" alternatives /ws
-
-alternatives  ::=  (conjuncts +/ (ws "|" ws)) +/ (ws ">" ws)
-
-conjuncts   ::=  sequence
-              |  sequence ^"&"  e*/ws   /ws
-              |  sequence ^"&~" e*/ws   /ws
-
-sequence    ::= e*/ws
-                (ws "/" e)?
-                (ws "=>" ws (word|quoted))?              => "seq"
-
-ec       ::= [~\-\]\\\~]
-           | escaped
-
-range    ::= ec          => "range"
-           | ec ^"-" ec
-
-e        ::=  word                          => "nonTerminal"
-           |  quoted                        => "literal"
-           |    ^"()"
-           |    ^"{" sequence "}"       /ws
-           |    ^"["  (range*) "]"
-           |    ^"[~" (range*) "]"
-           |    ^"^" quoted             /ws
-           |    ^"!" e                  /ws
-
-           |  (e ws ^"**" > e ws ^"*")
-           |  e ^"*/" e                 /ws
-           |  (e ws ^"++" > e ws ^"+")
-           |  e ^"+/" e                 /ws
-           |  e ^"?"                    /ws
-
-           |     "(" word         ^")"  /ws
-           >    ^"(" alternatives  ")"  /ws
-
-w       !::= " "
-           | "//" ([~\n]*) "\n"
-           | "\n"
-           | "\r"
+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)+) "\""
+Quoted   ::= "\"" ((~[\"\\] | escaped)+) "\""
            | "\"\"" => ""
 escaped  ::= "\\n" => "\n"
            | "\\r" => "\r"
-           | "\\" [~nr]
+           | "\\" ~[nr]
 
 
+w           ::= " " | "\n" | "\r"
+ws          ::=  w** => ()
+              |  w** "//" ~[\n]* "\n" ws => ()
+wp          ::=  w++