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%% Token Definitions for Erlang.
Definitions.
O = [0-7]
D = [0-9]
H = [0-9a-fA-F]
A = [a-z_A-Z@0-9]
WS = [\000-\s]
Rules.
{D}+\.{D}+((E|e)(\+|\-)?{D}+)? :
{token,{float,YYline,list_to_float(YYtext)}}.
{D}+#{H}+ : base(YYline, YYtext).
{D}+ : {token,{integer,YYline,list_to_integer(YYtext)}}.
[a-z]{A}* : Atom = list_to_atom(YYtext),
{token,case reserved_word(Atom) of
true -> {Atom,YYline};
false -> {atom,YYline,Atom}
end}.
[_A-Z]{A}* : {token,{var,YYline,list_to_atom(YYtext)}}.
"(\\\^.|\\.|[^"])*" :
%% Strip quotes.
S = lists:sublist(YYtext, 2, length(YYtext) - 2),
{token,{string,YYline,string_gen(S)}}.
'(\\\^.|\\.|[^'])*' :
%% Strip quotes.
S = lists:sublist(YYtext, 2, length(YYtext) - 2),
{token,{atom,YYline,list_to_atom(string_gen(S))}}.
\$(\\{O}{O}{O}|\\\^.|\\.|.) :
{token,{integer,YYline,cc_convert(YYtext)}}.
-> : {token,{'->',YYline}}.
:- : {token,{':-',YYline}}.
=/= : {token,{'=/=',YYline}}.
== : {token,{'==',YYline}}.
=:= : {token,{'=:=',YYline}}.
/= : {token,{'/=',YYline}}.
>= : {token,{'>=',YYline}}.
=< : {token,{'=<',YYline}}.
<= : {token,{'<=',YYline}}.
\+\+ : {token,{'++',YYline}}.
-- : {token,{'--',YYline}}.
[!?/;:,.*+#()[\]|<>={}-] :
{token,{list_to_atom(YYtext),YYline}}.
\.{WS} : {end_token,{dot,YYline}}.
\.%.* : {end_token,{dot,YYline}}. %Must special case this
{WS}+ : . %No token returned, eqivalent
\%.* : skip_token. % to 'skip_token'
Erlang code.
-author('rv@cslab.ericsson.se').
-copyright('Copyright (c) 1996 Ericsson Telecommunications AB').
-export([reserved_word/1]).
reserved_word('after') -> true;
reserved_word('begin') -> true;
reserved_word('case') -> true;
reserved_word('catch') -> true;
reserved_word('end') -> true;
reserved_word('fun') -> true;
reserved_word('if') -> true;
reserved_word('let') -> true;
reserved_word('of') -> true;
reserved_word('query') -> true;
reserved_word('receive') -> true;
reserved_word('when') -> true;
reserved_word('bnot') -> true;
reserved_word('not') -> true;
reserved_word('div') -> true;
reserved_word('rem') -> true;
reserved_word('band') -> true;
reserved_word('and') -> true;
reserved_word('bor') -> true;
reserved_word('bxor') -> true;
reserved_word('bsl') -> true;
reserved_word('bsr') -> true;
reserved_word('or') -> true;
reserved_word('xor') -> true;
reserved_word(_) -> false.
base(L, Cs) ->
H = string:chr(Cs, $#),
case list_to_integer(string:substr(Cs, 1, H-1)) of
B when B > 16 -> {error,"illegal base"};
B ->
case base(string:substr(Cs, H+1), B, 0) of
error -> {error,"illegal based number"};
N -> {token,{integer,L,N}}
end
end.
base([C|Cs], Base, SoFar) when C >= $0, C =< $9, C < Base + $0 ->
Next = SoFar * Base + (C - $0),
base(Cs, Base, Next);
base([C|Cs], Base, SoFar) when C >= $a, C =< $f, C < Base + $a - 10 ->
Next = SoFar * Base + (C - $a + 10),
base(Cs, Base, Next);
base([C|Cs], Base, SoFar) when C >= $A, C =< $F, C < Base + $A - 10 ->
Next = SoFar * Base + (C - $A + 10),
base(Cs, Base, Next);
base([C|Cs], Base, SoFar) -> error;
base([], Base, N) -> N.
cc_convert([$$,$\\|Cs]) ->
hd(string_escape(Cs));
cc_convert([$$,C]) -> C.
string_gen([$\\|Cs]) ->
string_escape(Cs);
string_gen([C|Cs]) ->
[C|string_gen(Cs)];
string_gen([]) -> [].
string_escape([O1,O2,O3|S]) when
O1 >= $0, O1 =< $7, O2 >= $0, O2 =< $7, O3 >= $0, O3 =< $7 ->
[(O1*8 + O2)*8 + O3 - 73*$0|string_gen(S)];
string_escape([$^,C|Cs]) ->
[C band 31|string_gen(Cs)];
string_escape([C|Cs]) when C >= 0, C =< $ ->
string_gen(Cs);
string_escape([C|Cs]) ->
[escape_char(C)|string_gen(Cs)].
escape_char($n) -> $\n; %\n = LF
escape_char($r) -> $\r; %\r = CR
escape_char($t) -> $\t; %\t = TAB
escape_char($v) -> $\v; %\v = VT
escape_char($b) -> $\b; %\b = BS
escape_char($f) -> $\f; %\f = FF
escape_char($e) -> $\e; %\e = ESC
escape_char($s) -> $ ; %\s = SPC
escape_char($d) -> $\d; %\d = DEL
escape_char(C) -> C.
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