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libobs/util: Add support for #if and #elif to CF parser #10312

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122 changes: 117 additions & 5 deletions libobs/util/cf-lexer.c
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Original file line number Diff line number Diff line change
Expand Up @@ -759,6 +759,28 @@ static inline struct cf_def *cf_preprocess_get_def(struct cf_preprocessor *pp, c
return pp->defines.array + idx;
}

bool cf_preprocess_get_def_value(struct cf_preprocessor *pp, const struct strref *def_name, int *value)
{
struct cf_def *def = cf_preprocess_get_def(pp, def_name);
if (def == NULL || def->macro)
return false;

for (size_t i = 0; i < def->tokens.num; i++) {
if (def->tokens.array[i].type == CFTOKEN_SPACETAB)
continue;
if (def->tokens.array[i].type == CFTOKEN_NUM &&
sscanf(def->tokens.array[i].str.array, "%i", value) == 1)
return true;

if (def->tokens.array[i].type == CFTOKEN_NAME &&
cf_preprocess_get_def_value(pp, &def->tokens.array[i].str, value))
return true;

return false;
}
return false;
}

static char space_filler[2] = " ";

static inline void append_space(struct cf_preprocessor *pp, cf_token_array_t *tokens, const struct cf_token *base)
Expand Down Expand Up @@ -887,6 +909,87 @@ static inline bool cf_preprocess_subblock(struct cf_preprocessor *pp, bool ignor
return !eof;
}

static void cf_preprocess_if(struct cf_preprocessor *pp, struct cf_token **p_cur_token)
{
struct cf_token *cur_token = *p_cur_token;

int value_a = 0;
int value_b = 0;

next_token(&cur_token, true);
if ((cur_token->type != CFTOKEN_NAME || !cf_preprocess_get_def_value(pp, &cur_token->str, &value_a)) &&
(cur_token->type != CFTOKEN_NUM || sscanf(cur_token->str.array, "%i", &value_a) != 1)) {
cf_adderror_expecting(pp, cur_token, "identifier or number");
go_to_newline(&cur_token);
goto exit;
}
next_token(&cur_token, true);
bool is_true = false;
if (cur_token->type == CFTOKEN_NEWLINE) {
is_true = value_a;
cur_token--;
} else {
if (cur_token->type != CFTOKEN_OTHER) {
cf_adderror_expecting(pp, cur_token, "comparator");
go_to_newline(&cur_token);
goto exit;
}
struct strref comparator = cur_token->str;
cur_token++;
while (cur_token->type == CFTOKEN_OTHER) {
comparator.len += cur_token->str.len;
cur_token++;
}
cur_token--;
next_token(&cur_token, true);
if ((cur_token->type != CFTOKEN_NAME || !cf_preprocess_get_def_value(pp, &cur_token->str, &value_b)) &&
(cur_token->type != CFTOKEN_NUM || sscanf(cur_token->str.array, "%i", &value_b) != 1)) {
cf_adderror_expecting(pp, cur_token, "identifier or number");
go_to_newline(&cur_token);
goto exit;
}

if (strref_cmp(&comparator, "==") == 0) {
is_true = value_a == value_b;
} else if (strref_cmp(&comparator, ">=") == 0) {
is_true = value_a >= value_b;
} else if (strref_cmp(&comparator, "<=") == 0) {
is_true = value_a <= value_b;
} else if (strref_cmp(&comparator, "!=") == 0) {
is_true = value_a != value_b;
} else if (strref_cmp(&comparator, "<") == 0) {
is_true = value_a < value_b;
} else if (strref_cmp(&comparator, ">") == 0) {
is_true = value_a > value_b;
} else {
cf_adderror_expecting(pp, cur_token, "comparator");
go_to_newline(&cur_token);
goto exit;
}
}

if (!cf_preprocess_subblock(pp, !is_true, &cur_token))
goto exit;

if (strref_cmp(&cur_token->str, "else") == 0) {
if (!cf_preprocess_subblock(pp, is_true, &cur_token))
goto exit;
} else if (strref_cmp(&cur_token->str, "elif") == 0) {
if (is_true) {
if (!cf_preprocess_subblock(pp, is_true, &cur_token))
goto exit;
} else {
cf_preprocess_if(pp, &cur_token);
goto exit;
}
}

cur_token++;

exit:
*p_cur_token = cur_token;
}

static void cf_preprocess_ifdef(struct cf_preprocessor *pp, bool ifnot, struct cf_token **p_cur_token)
{
struct cf_token *cur_token = *p_cur_token;
Expand All @@ -909,7 +1012,16 @@ static void cf_preprocess_ifdef(struct cf_preprocessor *pp, bool ifnot, struct c
if (strref_cmp(&cur_token->str, "else") == 0) {
if (!cf_preprocess_subblock(pp, is_true, &cur_token))
goto exit;
/*} else if (strref_cmp(&cur_token->str, "elif") == 0) {*/

} else if (strref_cmp(&cur_token->str, "elif") == 0) {
if (is_true) {
if (!cf_preprocess_subblock(pp, is_true, &cur_token))
goto exit;

} else {
cf_preprocess_if(pp, &cur_token);
goto exit;
}
}

cur_token++;
Expand Down Expand Up @@ -937,10 +1049,10 @@ static bool cf_preprocessor(struct cf_preprocessor *pp, bool if_block, struct cf
} else if (strref_cmp(&cur_token->str, "ifndef") == 0) {
cf_preprocess_ifdef(pp, true, p_cur_token);

/*} else if (strref_cmp(&cur_token->str, "if") == 0) {
TODO;*/
} else if (strref_cmp(&cur_token->str, "else") == 0 ||
/*strref_cmp(&cur_token->str, "elif") == 0 ||*/
} else if (strref_cmp(&cur_token->str, "if") == 0) {
cf_preprocess_if(pp, p_cur_token);

} else if (strref_cmp(&cur_token->str, "else") == 0 || strref_cmp(&cur_token->str, "elif") == 0 ||
strref_cmp(&cur_token->str, "endif") == 0) {
if (!if_block) {
struct dstr name;
Expand Down