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(*
Copyright (c) 2000
Cambridge University Technical Services Limited
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*)
(*
Title: Lexical symbols for ML compiler.
Author: Dave Matthews, Cambridge University Computer Laboratory
Copyright Cambridge University 1985
*)
structure Symbols : SymbolsSig =
struct
datatype sys =
AbortParse
| Ident
| AbstypeSy
| AndSy
| AndalsoSy
| AsSy
| CaseSy
| DatatypeSy
| DoSy
| ElseSy
| EndSy
| ExceptionSy
| FnSy
| FunSy
| HandleSy
| IfSy
| InSy
| InfixSy
| InfixrSy
| LetSy
| LocalSy
| NonfixSy
| OfSy
| OpSy
| OpenSy
| OrelseSy
| RaiseSy
| RecSy
| ThenSy
| TypeSy
| ValSy
| WithSy
| WhileSy
| LeftParen
| RightParen
| LeftBrack
| RightBrack
| Comma
| Colon
| Semicolon
| ThickArrow
| VerticalBar
| EqualsSign
| Underline
| TypeIdent
| StringConst
| IntegerConst
| Asterisk
| Arrow
| RealConst
| LeftCurly
| RightCurly
| ThreeDots
| ColonGt
| HashSign
| StructureSy
| SignatureSy
| StructSy
| SigSy
| SharingSy
| FunctorSy
| WithtypeSy
| EqtypeSy
| IncludeSy
| WhereSy
| WordConst
| CharConst
| Othersy
fun repr AbortParse = "\^G"
| repr Ident = "<identifier>"
| repr AbstypeSy = "abstype"
| repr AndSy = "and"
| repr AndalsoSy = "andalso"
| repr AsSy = "as"
| repr CaseSy = "case"
| repr DatatypeSy = "datatype"
| repr DoSy = "do"
| repr ElseSy = "else"
| repr EndSy = "end"
| repr ExceptionSy = "exception"
| repr FnSy = "fn"
| repr FunSy = "fun"
| repr HandleSy = "handle"
| repr IfSy = "if"
| repr InSy = "in"
| repr InfixSy = "infix"
| repr InfixrSy = "infixr"
| repr LetSy = "let"
| repr LocalSy = "local"
| repr NonfixSy = "nonfix"
| repr OfSy = "of"
| repr OpSy = "op"
| repr OpenSy = "open"
| repr OrelseSy = "orelse"
| repr RaiseSy = "raise"
| repr RecSy = "rec"
| repr ThenSy = "then"
| repr TypeSy = "type"
| repr ValSy = "val"
| repr WithSy = "with"
| repr WhileSy = "while"
| repr LeftParen = "("
| repr RightParen = ")"
| repr LeftBrack = "["
| repr RightBrack = "]"
| repr Comma = ","
| repr Colon = ":"
| repr Semicolon = ";"
| repr ThickArrow = "=>"
| repr VerticalBar = "|"
| repr EqualsSign = "="
| repr Underline = "_"
| repr TypeIdent = "<type identifier>"
| repr StringConst = "<string constant>"
| repr IntegerConst = "<integer constant>"
| repr Asterisk = "*"
| repr Arrow = "->"
| repr RealConst = "<real constant>"
| repr LeftCurly = "{"
| repr RightCurly = "}"
| repr ThreeDots = "..."
| repr ColonGt = ":>"
| repr HashSign = "#"
| repr StructureSy = "structure"
| repr SignatureSy = "signature"
| repr StructSy = "struct"
| repr SigSy = "sig"
| repr SharingSy = "sharing"
| repr FunctorSy = "functor"
| repr WithtypeSy = "withtype"
| repr EqtypeSy = "eqtype"
| repr IncludeSy = "include"
| repr WhereSy = "where"
| repr WordConst = "<word constant>"
| repr CharConst = "<char constant>"
| repr Othersy = "unknown symbol"
local
open HashTable;
val reservedWords =
[
AbstypeSy,
AndSy,
AndalsoSy,
AsSy,
CaseSy,
DatatypeSy,
DoSy,
ElseSy,
EndSy,
ExceptionSy,
FnSy,
FunSy,
HandleSy,
IfSy,
InSy,
InfixSy,
InfixrSy,
LetSy,
LocalSy,
NonfixSy,
OfSy,
OpSy,
OpenSy,
OrelseSy,
RaiseSy,
RecSy,
ThenSy,
TypeSy,
ValSy,
WithSy,
WhileSy,
StructureSy,
SignatureSy,
StructSy,
SigSy,
SharingSy,
FunctorSy,
WithtypeSy,
EqtypeSy,
IncludeSy,
WhereSy,
(* Reserved or special symbols *)
Arrow,
EqualsSign,
ThickArrow,
Asterisk,
ColonGt,
Underline,
Colon,
VerticalBar,
HashSign
]
local
(* Make table sparse to minimise collisions. *)
val table = hashMake (4 * List.length reservedWords);
(* Enter each reserved word in the hash table *)
val () = List.app (fn n => hashSet (table, repr n, n)) reservedWords
in
val table = hashFreeze table
end
in
(* Returns the symbol if it is in the table else ident *)
fun lookup str = getOpt(hashSub (table, str), Ident);
end;
end (* Symbols *);
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