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| author | Masahiro Yamada <yamada.masahiro@socionext.com> | 2018-12-11 14:01:01 +0300 |
|---|---|---|
| committer | Masahiro Yamada <yamada.masahiro@socionext.com> | 2018-12-21 18:25:52 +0300 |
| commit | c3d228713b10e6dd1bd44853168cec8e23ae7e0f (patch) | |
| tree | 199226be6fababdd0bc090b60149eca39f3604c4 /scripts | |
| parent | ce2164ab58316e27180034112f97608a764f5b37 (diff) | |
| download | linux-c3d228713b10e6dd1bd44853168cec8e23ae7e0f.tar.xz | |
kconfig: use specific tokens instead of T_ASSIGN for assignments
Currently, the lexer returns T_ASSIGN for all of =, :=, and +=
associating yylval with the flavor.
I want to make the generated lexer as simple as possible. So, the
lexer should convert keywords to tokens without thinking about the
meaning.
= -> T_EQUAL
:= -> T_COLON_EQUAL
+= -> T_PLUS_EQUAL
Unfortunately, Kconfig uses = instead of == for the equal operator.
So, the same token T_EQUAL is used for assignment and comparison.
The parser can still distinguish them from the context.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Diffstat (limited to 'scripts')
| -rw-r--r-- | scripts/kconfig/zconf.l | 6 | ||||
| -rw-r--r-- | scripts/kconfig/zconf.y | 12 |
2 files changed, 13 insertions, 5 deletions
diff --git a/scripts/kconfig/zconf.l b/scripts/kconfig/zconf.l index 30380790bab4..b1a71f612c11 100644 --- a/scripts/kconfig/zconf.l +++ b/scripts/kconfig/zconf.l @@ -118,9 +118,9 @@ n [A-Za-z0-9_-] return T_VARIABLE; free(yylval.string); } - "=" { BEGIN(ASSIGN_VAL); yylval.flavor = VAR_RECURSIVE; return T_ASSIGN; } - ":=" { BEGIN(ASSIGN_VAL); yylval.flavor = VAR_SIMPLE; return T_ASSIGN; } - "+=" { BEGIN(ASSIGN_VAL); yylval.flavor = VAR_APPEND; return T_ASSIGN; } + "=" { BEGIN(ASSIGN_VAL); return T_EQUAL; } + ":=" { BEGIN(ASSIGN_VAL); return T_COLON_EQUAL; } + "+=" { BEGIN(ASSIGN_VAL); return T_PLUS_EQUAL; } [[:blank:]]+ . warn_ignored_character(*yytext); \n { diff --git a/scripts/kconfig/zconf.y b/scripts/kconfig/zconf.y index e482000bb93e..3b7ebd363e7e 100644 --- a/scripts/kconfig/zconf.y +++ b/scripts/kconfig/zconf.y @@ -70,6 +70,7 @@ static struct menu *current_menu, *current_entry; %token T_ALLNOCONFIG_Y %token T_BOOL %token T_CLOSE_PAREN +%token T_COLON_EQUAL %token T_DEFAULT %token T_DEFCONFIG_LIST %token T_DEF_BOOL @@ -79,11 +80,11 @@ static struct menu *current_menu, *current_entry; %token T_MODULES %token T_OPEN_PAREN %token T_OPTION +%token T_PLUS_EQUAL %token T_STRING %token T_TRISTATE %token T_EOL %token <string> T_VARIABLE -%token <flavor> T_ASSIGN %token <string> T_ASSIGN_VAL %left T_OR @@ -101,6 +102,7 @@ static struct menu *current_menu, *current_entry; %type <id> end %type <menu> if_entry menu_entry choice_entry %type <string> word_opt assign_val +%type <flavor> assign_op %destructor { fprintf(stderr, "%s:%d: missing end statement for this entry\n", @@ -478,7 +480,13 @@ word_opt: /* empty */ { $$ = NULL; } /* assignment statement */ -assignment_stmt: T_VARIABLE T_ASSIGN assign_val T_EOL { variable_add($1, $3, $2); free($1); free($3); } +assignment_stmt: T_VARIABLE assign_op assign_val T_EOL { variable_add($1, $3, $2); free($1); free($3); } + +assign_op: + T_EQUAL { $$ = VAR_RECURSIVE; } + | T_COLON_EQUAL { $$ = VAR_SIMPLE; } + | T_PLUS_EQUAL { $$ = VAR_APPEND; } +; assign_val: /* empty */ { $$ = xstrdup(""); }; |