+ s = q */ ws
+ ws = " "*
+ q = q:: [a-z]++
+}
+
+testcase {
+
+ input "
+
+
+
+ while x>0
+ while y>0
+ foo()
+ bar()
+
+
+ while x>0
+ while y>0
+ foo()
+ bar()
+
+
+
+";
+ output "smt:{while:{>:{{x} {0}} while:{>:{{y} {0}} sbb:{{f o o} {b a r}}}} while:{>:{{x} {0}} sbb:{while:{>:{{y} {0}} {f o o}} {b a r}}}}";
+
+indent = ww
+outdent = " " outdent " "
+ | " " (~[]*) "\n"
+
+w = " " | "\n" | "\r"
+ws = w*
+ww = sp*
+sp = " "
+any = ~[]*
+
+s = smt:: !ws statement !ws statement !ws
+
+block = !"\n" !indent blockBody
+ &~ !"\n" !outdent !(~[\ ]) !(~[]*)
+
+blockBody = statement
+ > sbb:: statement ws blockBody
+
+statement = call
+ | ^"while" expr block /ws
+
+expr = ident
+ | call
+ | expr ^">" expr /ws
+ | num
+
+call = expr "()" /ws
+
+num = [0-9]++
+
+ident = [a-z]++ &~ keyword
+keyword = "if" | "then" | "else" | "while"
+
+
+
+}
+
+
+
+testcase {
+ input "abc ";
+
+ s = s2:: q " "*
+ q = a3:: [a-z] [a-z] [a-z]
+ &~ ~[] "b" ~[]*
+}
+
+testcase {
+ input "abc ";
+ output "s:{a b c}";
+
+ s = s:: [a-z] [a-z] [a-z] " "*
+}
+
+testcase {
+
+ input "a+2";
+ output "Plus:{left:{Foo} right:{{2}}}";
+
+ s = Expr
+ Expr = [0-9]++
+ | Plus:: (left::Expra) "+" (right::Expr)
+ Expra = Foo:: ("a" | "b")
+
+}
+
+testcase {
+ input "aaaaa";
+ output "top:{a q:{{a a a}} a}";
+ s = top:: z (q::"a"*) z
+ z = a:: "a"
+}
+
+testcase {
+ input "if (x) if (y) z else q";
+ output "if:{ident:{{x}} else:{if:{ident:{{y}} then:{ident:{{z}}}} ident:{{q}}}}";
+
+ s = Expr
+ Expr = if:: "if" "(" Expr ")" IfBody /ws
+ | ident:: [a-z]++
+ IfBody = else:: Expr "else" Expr /ws
+ | then:: Expr &~ (~[]* "else" !Expr /ws)
+ ws = [ ]**