Syntax

# pyLRp grammar
# for the shellfish language

# the next line comes directly from the future ...
# import SyntaxTree

%lexer

"(.|\s)*" %restart
\s+ %restart

self SELF
thisContext THISCONTEXT
super SUPER

[a-zA-Z][a-zA-Z0-9]* SYM
[a-zA-Z][a-zA-Z0-9]*: KEY
\#([a-zA-Z][a-zA-Z0-9:]*|[\+\-\*\/\\@:,\.\|\&]+) SYMLIT
[\+\-\*\/\\@:,\.\|\&]+ BIN

# well the current grammar parser is not very nice, a pyLRp parser for pyLRp grammars,
# which uses only the current, limited command-set would solve the problem.
# probably such beauties will be possible in the self parsed, bootstrapped version:

# nearly full lex-capability
# \" %begin(COMMENT), %restart
# <COMMENT> \" %end, %restart
# <COMMENT> .* %restart

# \"\"\" %begin(MLSTRING), %restart
# <MLSTRING> .* %append, %restart
# <MLSTRING> \"\"\" %collect, %end, MLSTRING

%parser

%left KEY
%left BIN
%left SYM

doc:
   %empty
   doc statement

statement:
    exp
    "^" exp
    SYM ":=" exp
    statement "."

exp:
    SELF
    THISCONTEXT
    SUPER
    SYM:
	print "Symbol"
    SYMLIT
    "(" exp ")"
    exp SYM
    exp BIN exp
    exp KEY exp
    "[" optparams optlocals doc "]"

optparams:
    params "|"
    %empty

params:
    params ":" SYM
    ":" SYM

optlocals:
    %empty
    "|" locals "|" 

locals:
    %empty
    locals SYM