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|
start : program .
program = block ENDPROG!.
vardecl = new id NEWDECL! .
fordecl = formal id FORMALDECL! .
labdecl = label id LABELDECL! .
var = id VARID! { "[" expr "]" SUBSCR! | "." DOT! } .
logval = true LOGVALTRUE! .
logval = false LOGVALFALSE! .
number = realN | integerN.
reference = "@" var REFERENCE! .
# listhead -> "(" LISTHD1!
# listhead -> listhead expr "," LISTHD2!
# listN -> listhead ")" LISTN1!
# listN -> listhead expr ")" LISTN2!
listN = "(" LISTHD1! ( ")" LISTN1! | expr listTl ) .
listTl = ")" LISTN2! | "," LISTHD2! ( expr listTl | ")" LISTN1! ) .
prochead = "'" PROCHD! { fordecl ";" PROCFORDECL! } .
procdef = prochead expr "'" PROCDEF! .
primary = var ( listN CALL! | VALUE!) | primary1 .
primary1 = logval LOADLOGVAL! | number LOADNUM! |
symbol LOADSYMB!| reference |
listN | tail primary UOP! | procdef |
undef LOADUNDEF! | "[" expr "]" PARENS! | in INPUT! |
isb var UOP! | isn var UOP! | isr var UOP! |
isl var UOP! | isli var UOP! | isy var UOP! |
isp var UOP! | isu var UOP! | abs primary UOP! |
length var UOP! | integer primary UOP! |
real primary UOP! | logical primary UOP! | list primary UOP! .
factor = primary factortail.
factortail = { "**" primary BOP! } .
term = factor termtail.
termtail = { "*" factor BOP! | "/" factor BOP! |
div factor BOP! | mod factor BOP! } .
sum = ("+" term UPLUS! | "-" term NEG! | term) sumtail.
sumtail = { "+" term BOP! | "-" term BOP! } .
choice = sum choicetail.
choicetail = { min sum BOP! | max sum BOP! } .
relation = choice relationtail.
relationtail = [ "=" choice BOP! | "~=" choice BOP!
| "<" choice BOP! | "<=" choice BOP!
| ">" choice BOP! | ">=" choice BOP! ] .
negation = "~" relation UOP! | relation .
conj = negation conjtail.
conjtail = [ and CONJHD! conj CONJ! ].
disj = conj disjtail.
disjtail = [ or DISJHD! disj DISJ! ] .
catenatail = { "&" primary BOP! }.
truepart = expr else TRUEPT! .
ifclause = if expr then IFCLSE! .
expr = var exprtail | expr1.
exprtail = "<-" expr BOP! |
( listN CALL! | VALUE!)
factortail
termtail
sumtail
choicetail
relationtail
conjtail
disjtail
catenatail .
expr1 = block .
expr1 = ifclause truepart expr IFEXPR! .
expr1 = goto primary UOP! .
expr1 = out expr UOP! .
expr1 = primary1
factortail
termtail
sumtail
choicetail
relationtail
conjtail
disjtail
catenatail .
expr1 = ( "+" term UPLUS! | "-" term NEG! )
sumtail
choicetail
relationtail
conjtail
disjtail
catenatail .
expr1 = "~" relation UOP! conjtail disjtail catenatail .
stat = expr1
| id ( ":" LABDEF! stat LABSTMT!
| VARID! { "[" expr "]" SUBSCR! | "." DOT! }
exprtail ) .
block = begin BEGIN!
{ vardecl ";" BLKHD! | labdecl ";" BLKHD!}
stat { ";" BLKBODY! stat } end BLK! .
|
