diff options
Diffstat (limited to 'sys/cmd/rc/var.c')
| -rw-r--r-- | sys/cmd/rc/var.c | 69 |
1 files changed, 67 insertions, 2 deletions
diff --git a/sys/cmd/rc/var.c b/sys/cmd/rc/var.c index 5e1e90c..3e9635f 100644 --- a/sys/cmd/rc/var.c +++ b/sys/cmd/rc/var.c @@ -1,6 +1,19 @@ #include "rc.h" +#include "parse.h" + +// TODO: string interning + +// ----------------------------------------------------------------------- +// globals + +struct Keyword +{ + char *name; + int type; +}; static Var *globals[512]; +static struct Keyword keywords[100]; // sparse map means less hits // ----------------------------------------------------------------------- // internals @@ -111,8 +124,6 @@ bigpath(Var *v) ·setvar("path", w, 0); } - - // ----------------------------------------------------------------------- // exports @@ -269,3 +280,57 @@ initpath(void) bigpath(v); } +#define KEYWORDS \ + KEYWORD("for", Tfor) \ + KEYWORD("in", Tin) \ + KEYWORD("while", Twhile) \ + KEYWORD("if", Tif) \ + KEYWORD("else", Telse) \ + KEYWORD("switch", Tswitch) \ + KEYWORD("case", Tcase) \ + KEYWORD("!", Tbang) \ + KEYWORD("@", Tsubshell) \ + KEYWORD("func", Tfunc) + +void +initkeywords(void) +{ + int i, s, j, h; +#define KEYWORD(a, b) a, + static char *name[] = { KEYWORDS }; +#undef KEYWORD +#define KEYWORD(a, b) b, + static int type[] = { KEYWORDS }; +#undef KEYWORD + + for(i = 0; i < arrlen(type); i++){ + h = hash(name[i], arrlen(keywords)); + for(s=0; s < arrlen(keywords); s++){ + j = (h + s) % arrlen(keywords); + if(!keywords[j].type || strcmp(keywords[j].name, name[i]) == 0){ + keywords[j].name = name[i]; + keywords[j].type = type[i]; + goto nextkeyword; + } + } + nextkeyword:; + } +} + +int +iskeyword(char *word) +{ + int i, s, h; + + h = hash(word, arrlen(keywords)); + for(s = 0; s < arrlen(keywords); s++){ + i = (h + s) % arrlen(keywords); + if(!keywords[i].type) + return 0; + if(strcmp(keywords[i].name, word) == 0) + return keywords[i].type; + } + return 0; +} + +#undef KEYWORDS |