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ersatz.l
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ersatz.l
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blank [\9\32]
identfst [A-Za-z]
identchr [A-Za-z0-9_]
intlit -?[0-9][0-9]*
floatlit -?[0-9]+(\.[0-9]*)?([eE][-+]?[0-9]+)?
%%
"{#" (let ((start "{#") (end "#}"))
(cases lexer-mode (lexer-curmode)
(LexerPlain ()
(let loop ((kont yycontinue)
(depth 1))
(let ((c (yygetc)))
(cond ((eq? 'eof c)
(lexer-error "unexpected end of comment"))
((lexer-lookahead c end 2 yygetc yyungetc)
(kont))
((lexer-lookahead c start 2 yygetc yyungetc)
(loop (lambda () (loop kont depth)) (+ 1 depth)))
(else (loop kont depth))
))
))
(else
(lexer-error "unexpected comment"))))
"{{" (cases lexer-mode (lexer-curmode)
(LexerPlain ()
(lexer-curmode (LexerExpand))
(let ((text (lexer-get-text)))
(if (string-null? text)
(tok yyline EXPAND)
(begin
(lexer-token-cache (cons (tok yyline EXPAND) (lexer-token-cache)))
(tok yyline TEXT text)
))
))
(else
(lexer-error "unexpected expansion"))
)
"}}"|"}}\n" (cases lexer-mode (lexer-curmode)
(LexerExpand ()
(lexer-curmode (LexerPlain))
(tok yyline ENDEXPAND))
(else
(lexer-error "unexpected end of expansion"))
)
"{%" (cases lexer-mode (lexer-curmode)
(LexerPlain ()
(let ((text (lexer-get-text)))
(lexer-curmode (LexerLogic))
(if (string-null? text)
(yycontinue)
(tok yyline TEXT text))))
(else
(lexer-error "unexpected logic mode"))
)
"%}"|"%}\n" (cases lexer-mode (lexer-curmode)
(LexerLogic ()
(lexer-curmode (LexerPlain))
(yycontinue))
(else (lexer-error "unexpected end of logic mode"))
)
"\\{" (begin
(display #\{ (lexer-text-buffer))
(yycontinue))
"\\}" (begin
(display #\} (lexer-text-buffer))
(yycontinue))
"\"" (cases lexer-mode (lexer-curmode)
(LexerPlain ()
(display #\" (lexer-text-buffer))
(yycontinue))
(else
(let loop ([cs '()])
(let ([c (yygetc)])
(cond [(eq? 'eof c) (lexer-error "unexpected end of string constant")]
[(char=? c #\\) (let ((n (yygetc)))
(loop (cons n cs)))]
[(char=? c #\") (tok yyline STRING (reverse-list->string cs)) ]
[else (loop (cons c cs))])))
))
"\'" (cases lexer-mode (lexer-curmode)
(LexerPlain ()
(display #\' (lexer-text-buffer))
(yycontinue))
(else
(let loop ([cs '()])
(let ([c (yygetc)])
(cond [(eq? 'eof c) (lexer-error "unexpected end of string constant")]
[(char=? c #\\) (let ((n (yygetc)))
(loop (cons n cs)))]
[(char=? c #\') (tok yyline STRING (reverse-list->string cs)) ]
[else (loop (cons c cs))])))
))
"\n" (begin
(display #\newline (lexer-text-buffer))
(yycontinue))
{intlit} (cases lexer-mode (lexer-curmode)
(LexerPlain ()
(begin
(display yytext (lexer-text-buffer))
(yycontinue)))
(else
(tok yyline INT (string->number yytext)))
)
{floatlit} (cases lexer-mode (lexer-curmode)
(LexerPlain ()
(begin
(display yytext (lexer-text-buffer))
(yycontinue)))
(else
(let ((n (string-length yytext)))
(tok yyline FLOAT (string->number
(substring yytext 0 n)))))
)
{identfst}{identchr}* (cases lexer-mode (lexer-curmode)
(LexerPlain ()
(begin
(display yytext (lexer-text-buffer))
(yycontinue)))
(else
(let*
((word (string->symbol yytext))
(t (alist-ref word lexer-keywords)))
(if t (tok yyline ,t)
(tok yyline IDENT word))))
)
"."{identfst}{identchr}* (cases lexer-mode (lexer-curmode)
(LexerPlain ()
(begin
(display yytext (lexer-text-buffer))
(yycontinue)))
(else
(let*
((n (string-length yytext))
(word (substring yytext 1 n)))
(tok yyline DOTFIELD word))))
"==" (cases lexer-mode (lexer-curmode)
(LexerPlain ()
(display yytext (lexer-text-buffer))
(yycontinue))
(else
(tok yyline EQEQ)))
"**" (cases lexer-mode (lexer-curmode)
(LexerPlain ()
(display yytext (lexer-text-buffer))
(yycontinue))
(else
(tok yyline POWER)))
"||" (cases lexer-mode (lexer-curmode)
(LexerPlain ()
(display yytext (lexer-text-buffer))
(yycontinue))
(else
(tok yyline OR)))
"&&" (cases lexer-mode (lexer-curmode)
(LexerPlain ()
(display yytext (lexer-text-buffer))
(yycontinue))
(else
(tok yyline AND)))
"!=" (cases lexer-mode (lexer-curmode)
(LexerPlain ()
(display yytext (lexer-text-buffer))
(yycontinue))
(else
(tok yyline NEQ)))
. (begin
(cases lexer-mode (lexer-curmode)
(LexerPlain ()
(display yytext (lexer-text-buffer))
(yycontinue))
(else
(let* ((word yytext)
(t (find-operator word lexer-operators )))
(case (car t)
((full) (tok yyline ,(cadr t)))
((partial) (let ((c (yygetc)))
(if (char=? c (string-ref (cadr t) 1))
(tok yyline ,(caddr t))
(begin (yyungetc)
(tok yyline IDENT (string->symbol word))
))
))
(else (if (char-set-contains? char-set:whitespace (string-ref word 0))
(yycontinue)
(tok yyline IDENT (string->symbol word))))
))
))
)
<<EOF>> (cases lexer-mode (lexer-curmode)
(LexerPlain ()
(let ((text (lexer-get-text)))
(if (string-null? text)
'*eoi*
(tok yyline TEXT text)
)))
(else (lexer-error "unexpected end of input (lexer)")))