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implemented /re/i for case-insensitive patterns

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This commit is contained in:
Vern Paxson 2018-06-26 15:59:41 -07:00
parent bd5414d8d5
commit 80b3b82b54
8 changed files with 117 additions and 27 deletions
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21
src/re-scan.l
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@ -114,6 +114,25 @@ CCL_EXPR ("[:"[[:alpha:]]+":]")
}
}
"(+i"[ \t]* case_insensitive = 1; return TOK_CASE_INSENSITIVE;
[a-zA-Z] {
if ( case_insensitive )
{
char c = yytext[0]; // unput trashes yytext!
// Push back the character inside a CCL,
// so the parser can then expand it.
unput(']');
unput(c);
unput('[');
}
else
{
yylval.int_val = yytext[0];
return TOK_CHAR;
}
}
[|*+?.(){}] return yytext[0];
. yylval.int_val = yytext[0]; return TOK_CHAR;
\n return 0; // treat as end of pattern
@ -157,7 +176,7 @@ CCL_EXPR ("[:"[[:alpha:]]+":]")
"[:upper:]" {
BEGIN(SC_CCL);
yylval.cce_val =
case_insensitive ? my_isupper : my_islower;
case_insensitive ? my_islower : my_isupper;
return TOK_CCE;
}