enhanced_status.anubis
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/*
*
* User: David RENE
* Date: 30/05/2008
* Time: 03:30
* (c) Calexium
*
*/
read tools/basis.anubis
We want to test email addresses. Below is a regular expression for that
purpose. Actually, this expression is too nave. A real one would be more complicated.
read tools/streams.anubis
read system/string.anubis
type LM_TokenOrError_EnhancedStatus:
end_of_file,
token(List(Word8)),
error.
type LM_LexerState_EnhancedStatus: ...
type LM_Match_EnhancedStatus:
match(List(Word8) characters,
(LM_LexerState_EnhancedStatus,List(Word8)) -> (LM_LexerState_EnhancedStatus,LM_TokenOrError_EnhancedStatus) action,
Bool aeol,
Bool abol).
type LM_LexerState_EnhancedStatus:
lexer_state(Stream input,
List(Word8) unput, // in natural order
List(Word8) more, // in reverse order
LM_LexerState_EnhancedStatus -> (LM_LexerState_EnhancedStatus,LM_TokenOrError_EnhancedStatus) lexer,
Bool at_end_of_line,
Bool at_beginning_of_line,
Maybe(LM_Match_EnhancedStatus) match).
define LM_LexerState_EnhancedStatus
lm_initial_state
(
Stream input,
LM_LexerState_EnhancedStatus -> (LM_LexerState_EnhancedStatus,LM_TokenOrError_EnhancedStatus) lexer
) =
lexer_state(input,[],[],lexer,false,true,failure).
define (LM_LexerState_EnhancedStatus,Word8)
lm_next_char
(
LM_LexerState_EnhancedStatus ls
) =
if ls is lexer_state(input,unput,more,lex,aeol,abol,match) then
if unput is
{
[ ] then
if read_byte(input) is
{
failure then
(lexer_state(input,
[],
more,
lex,
true,
aeol,
match),
-1),
success(c) then
(lexer_state(input,
[],
[c . more],
lex,
c = '\n',
aeol,
match),
c),
},
[h . t] then
(lexer_state(input,
t,
[h . more],
lex,
h = '\n',
aeol,
match),
h)
}.
define LM_LexerState_EnhancedStatus
lm_remember_match
(
(LM_LexerState_EnhancedStatus,List(Word8)) -> (LM_LexerState_EnhancedStatus,LM_TokenOrError_EnhancedStatus) action,
LM_LexerState_EnhancedStatus ls
) =
if ls is lexer_state(input,unput,more,lex,aeol,abol,m) then
with chars = if m is
{
failure then [],
success(match) then
if match is match(chars,_,_,_) then chars
},
lexer_state(input,
unput,
[],
lex,
aeol,
abol,
success(match(append(more,chars),action,aeol,abol))).
define (LM_LexerState_EnhancedStatus,LM_TokenOrError_EnhancedStatus)
lm_find_match
(
LM_LexerState_EnhancedStatus ls
) =
if ls is lexer_state(input,unput,more,lex,_,_,mb_m) then
if mb_m is
{
failure then (ls,error),
success(m) then
if m is match(chars,action,aeol,abol) then
action(lexer_state(input,
append(more,unput),
[],
lex,
aeol,
abol,
failure),
reverse(chars))
}.
define LM_LexerState_EnhancedStatus
change_lexer
(
LM_LexerState_EnhancedStatus ls,
LM_LexerState_EnhancedStatus -> (LM_LexerState_EnhancedStatus,LM_TokenOrError_EnhancedStatus) lex
) =
if ls is lexer_state(input,unput,more,_,aeol,abol,mb_m) then
lexer_state(input,unput,more,lex,aeol,abol,mb_m).
define LM_LexerState_EnhancedStatus
clear_abol
(
LM_LexerState_EnhancedStatus ls
) =
if ls is lexer_state(input,unput,more,lex,aeol,_,mb_m) then
lexer_state(input,unput,more,lex,aeol,false,mb_m).
Declarations of all lexer states.
public define (LM_LexerState_EnhancedStatus,LM_TokenOrError_EnhancedStatus) enhanced_status_tester(LM_LexerState_EnhancedStatus ls).
define (LM_LexerState_EnhancedStatus,LM_TokenOrError_EnhancedStatus) enhanced_status_tester_state_1(LM_LexerState_EnhancedStatus ls).
define (LM_LexerState_EnhancedStatus,LM_TokenOrError_EnhancedStatus) enhanced_status_tester_state_2(LM_LexerState_EnhancedStatus ls).
define (LM_LexerState_EnhancedStatus,LM_TokenOrError_EnhancedStatus) enhanced_status_tester_state_3(LM_LexerState_EnhancedStatus ls).
define (LM_LexerState_EnhancedStatus,LM_TokenOrError_EnhancedStatus) enhanced_status_tester_state_4(LM_LexerState_EnhancedStatus ls).
define (LM_LexerState_EnhancedStatus,LM_TokenOrError_EnhancedStatus) enhanced_status_tester_state_5(LM_LexerState_EnhancedStatus ls).
define (LM_LexerState_EnhancedStatus,LM_TokenOrError_EnhancedStatus) enhanced_status_tester_state_6(LM_LexerState_EnhancedStatus ls).
define (LM_LexerState_EnhancedStatus,LM_TokenOrError_EnhancedStatus) enhanced_status_tester_state_7(LM_LexerState_EnhancedStatus ls).
define (LM_LexerState_EnhancedStatus,LM_TokenOrError_EnhancedStatus) enhanced_status_tester_state_8(LM_LexerState_EnhancedStatus ls).
define (LM_LexerState_EnhancedStatus,LM_TokenOrError_EnhancedStatus) enhanced_status_tester_action_0
(LM_LexerState_EnhancedStatus ls, List(Word8) text).
define (LM_LexerState_EnhancedStatus,LM_TokenOrError_EnhancedStatus) enhanced_status_tester_action_1
(LM_LexerState_EnhancedStatus ls, List(Word8) text).
define (LM_LexerState_EnhancedStatus,LM_TokenOrError_EnhancedStatus) enhanced_status_tester_action_2
(LM_LexerState_EnhancedStatus ls, List(Word8) text).
Lexer states.
public define (LM_LexerState_EnhancedStatus,LM_TokenOrError_EnhancedStatus)
enhanced_status_tester
(
LM_LexerState_EnhancedStatus ls,
) =
if at_beginning_of_line(ls)
then enhanced_status_tester_state_3(clear_abol(ls)) else
if lm_next_char(ls) is (ls,c) then
if c = -1 then enhanced_status_tester_state_1(ls) else
if c = 50 then enhanced_status_tester_state_4(ls) else
if (52 +=< c & c +=< 53) then enhanced_status_tester_state_4(ls) else
lm_find_match(ls).
define (LM_LexerState_EnhancedStatus,LM_TokenOrError_EnhancedStatus)
enhanced_status_tester_state_1
(
LM_LexerState_EnhancedStatus ls,
) =
with ls = lm_remember_match(enhanced_status_tester_action_2,ls),
if lm_next_char(ls) is (ls,c) then
lm_find_match(ls).
define (LM_LexerState_EnhancedStatus,LM_TokenOrError_EnhancedStatus)
enhanced_status_tester_state_2
(
LM_LexerState_EnhancedStatus ls,
) =
if lm_next_char(ls) is (ls,c) then
lm_find_match(ls).
define (LM_LexerState_EnhancedStatus,LM_TokenOrError_EnhancedStatus)
enhanced_status_tester_state_3
(
LM_LexerState_EnhancedStatus ls,
) =
with ls = lm_remember_match(enhanced_status_tester_action_1,ls),
if lm_next_char(ls) is (ls,c) then
lm_find_match(ls).
define (LM_LexerState_EnhancedStatus,LM_TokenOrError_EnhancedStatus)
enhanced_status_tester_state_4
(
LM_LexerState_EnhancedStatus ls,
) =
if lm_next_char(ls) is (ls,c) then
if c = 46 then enhanced_status_tester_state_5(ls) else
if c = 50 then enhanced_status_tester_state_4(ls) else
if (52 +=< c & c +=< 53) then enhanced_status_tester_state_4(ls) else
lm_find_match(ls).
define (LM_LexerState_EnhancedStatus,LM_TokenOrError_EnhancedStatus)
enhanced_status_tester_state_5
(
LM_LexerState_EnhancedStatus ls,
) =
if lm_next_char(ls) is (ls,c) then
if c = 46 then enhanced_status_tester_state_5(ls) else
if (48 +=< c & c +=< 57) then enhanced_status_tester_state_6(ls) else
lm_find_match(ls).
define (LM_LexerState_EnhancedStatus,LM_TokenOrError_EnhancedStatus)
enhanced_status_tester_state_6
(
LM_LexerState_EnhancedStatus ls,
) =
if lm_next_char(ls) is (ls,c) then
if c = 46 then enhanced_status_tester_state_7(ls) else
if (48 +=< c & c +=< 57) then enhanced_status_tester_state_6(ls) else
lm_find_match(ls).
define (LM_LexerState_EnhancedStatus,LM_TokenOrError_EnhancedStatus)
enhanced_status_tester_state_7
(
LM_LexerState_EnhancedStatus ls,
) =
if lm_next_char(ls) is (ls,c) then
if c = 46 then enhanced_status_tester_state_7(ls) else
if (48 +=< c & c +=< 57) then enhanced_status_tester_state_8(ls) else
lm_find_match(ls).
define (LM_LexerState_EnhancedStatus,LM_TokenOrError_EnhancedStatus)
enhanced_status_tester_state_8
(
LM_LexerState_EnhancedStatus ls,
) =
with ls = lm_remember_match(enhanced_status_tester_action_0,ls),
if lm_next_char(ls) is (ls,c) then
if (48 +=< c & c +=< 57) then enhanced_status_tester_state_8(ls) else
lm_find_match(ls).
define (LM_LexerState_EnhancedStatus,LM_TokenOrError_EnhancedStatus)
enhanced_status_tester_action_0
(
LM_LexerState_EnhancedStatus ls,
List(Word8) text
) =
(ls,token(text)).
define (LM_LexerState_EnhancedStatus,LM_TokenOrError_EnhancedStatus)
enhanced_status_tester_action_1
(
LM_LexerState_EnhancedStatus ls,
List(Word8) text
) =
/* default action */ enhanced_status_tester(ls) .
define (LM_LexerState_EnhancedStatus,LM_TokenOrError_EnhancedStatus)
enhanced_status_tester_action_2
(
LM_LexerState_EnhancedStatus ls,
List(Word8) text
) =
/* default action */ (ls,end_of_file) .
Since '@' is a normal character, a string needs to contain exactly one '@' for being
accepted. What is accepted before and after this '@' is described by:
[a-zA-Z]+(\.[a-zA-Z]+)*
The first part: [a-zA-Z]+ means ``at least one letter''. The last part: (\.[a-zA-Z]+)*
means: ``a dot followed by at least one letter, and this may be repeated any number of
times (including zero)''.
This part of the source file is the 'postambule' (just Anubis text, which is copied 'as
is' to the lexer_maker output file).
The above stuff produces a function named 'email_tester' into the lexer_maker output
file. This function is used below:
define Maybe(String)
_extract_enhanced_status
(
List(String) lines
) =
if lines is
{
[ ] then failure,
[h . t] then
with ls = lexer_state(make_stream(h),[],[],enhanced_status_tester,true,false,failure),
if enhanced_status_tester(ls) is (_,result) then
if result is
{
end_of_file then _extract_enhanced_status(t),
token(tok) then success(implode(tok))
error then _extract_enhanced_status(t)
}
}.
public define Maybe(String)
extract_enhanced_status
(
List(String) lines
) =
if lines is
{
[ ] then failure,
[h . t] then
if _extract_enhanced_status(split_by_token(h, ' ')) is
{
failure then extract_enhanced_status(t),
success(r) then success(r)
}
}.