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kconfig: refactor pattern matching in STRING state 

Here, similar matching patters are duplicated in order to look ahead
the '\n' character. If the next character is '\n', the lexer returns
T_WORD_QUOTE because it must be prepared to return T_EOL at the next
match.

Use unput('\n') trick to reduce the code duplication.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
This commit is contained in:
Masahiro Yamada 2018-12-11 20:00:48 +09:00
parent be3c807597
commit 21c5ecf604
1 changed files with 3 additions and 11 deletions
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14
scripts/kconfig/zconf.l
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@ -182,19 +182,9 @@ n [A-Za-z0-9_-]
<STRING>{
"$".* append_expanded_string(yytext);
[^$'"\\\n]+/\n {
append_string(yytext, yyleng);
yylval.string = text;
return T_WORD_QUOTE;
}
[^$'"\\\n]+ {
append_string(yytext, yyleng);
}
\\.?/\n {
append_string(yytext + 1, yyleng - 1);
yylval.string = text;
return T_WORD_QUOTE;
}
\\.? {
append_string(yytext + 1, yyleng - 1);
}
@ -210,8 +200,10 @@ n [A-Za-z0-9_-]
fprintf(stderr,
"%s:%d:warning: multi-line strings not supported\n",
zconf_curname(), zconf_lineno());
unput('\n');
BEGIN(INITIAL);
return T_EOL;
yylval.string = text;
return T_WORD_QUOTE;
}
<<EOF>> {
BEGIN(INITIAL);