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// Read a configuration file.
// Config files are formatted as several sections, each containing key = value pairs.
// e.g.:
// [section1]
// thing1 = 33
// thing2 = 454
// [section2]
// asdf = 123
typedef enum {
SECTION_NONE,
SECTION_KEYBOARD
} Section;
// Returns the key combination described by str. filename and line_number should be passed inm to generate nice errors.
static u32 config_parse_key_combo(Ted *ted, char const *str, char const *filename, uint line_number) {
u32 modifier = 0;
// read modifier
while (true) {
if (util_is_prefix(str, "Ctrl+")) {
if (modifier & KEY_MODIFIER_CTRL) {
ted_seterr(ted, "%s:%u: Ctrl+ written twice", filename, line_number);
return 0;
}
modifier |= KEY_MODIFIER_CTRL;
str += strlen("Ctrl+");
} else if (util_is_prefix(str, "Shift+")) {
if (modifier & KEY_MODIFIER_SHIFT) {
ted_seterr(ted, "%s:%u: Shift+ written twice", filename, line_number);
return 0;
}
modifier |= KEY_MODIFIER_SHIFT;
str += strlen("Shift+");
} else if (util_is_prefix(str, "Alt+")) {
if (modifier & KEY_MODIFIER_ALT) {
ted_seterr(ted, "%s:%u: Alt+ written twice", filename, line_number);
return 0;
}
modifier |= KEY_MODIFIER_ALT;
str += strlen("Alt+");
} else break;
}
// read key
SDL_Scancode scancode = SDL_GetScancodeFromName(str);
if (scancode == SDL_SCANCODE_UNKNOWN) {
typedef struct {
char const *keyname1;
char const *keyname2; // alternate key name
SDL_Scancode scancode;
bool shift;
} KeyName;
static KeyName const key_names[] = {
{"Apostrophe", "Single Quote", SDL_SCANCODE_APOSTROPHE, 0},
{"Backslash", 0, SDL_SCANCODE_BACKSLASH, 0},
{"Comma", 0, SDL_SCANCODE_COMMA, 0},
{"Equals", 0, SDL_SCANCODE_EQUALS, 0},
{"Grave", "Backtick", SDL_SCANCODE_GRAVE, 0},
{"Keypad Plus", 0, SDL_SCANCODE_KP_PLUS, 0},
{"Keypad Minus", 0, SDL_SCANCODE_KP_MINUS, 0},
{"Keypad Divide", 0, SDL_SCANCODE_KP_DIVIDE, 0},
{"Keypad Multiply", 0, SDL_SCANCODE_KP_MULTIPLY, 0},
{"Left Bracket", 0, SDL_SCANCODE_LEFTBRACKET, 0}, // [
{"Right Bracket", 0, SDL_SCANCODE_RIGHTBRACKET, 0}, // ]
{"Dash", 0, SDL_SCANCODE_MINUS, 0},
{"Minus", 0, SDL_SCANCODE_MINUS, 0},
{"Period", 0, SDL_SCANCODE_PERIOD, 0},
{"Semicolon", 0, SDL_SCANCODE_SEMICOLON, 0},
{"Slash", 0, SDL_SCANCODE_SLASH, 0},
{"Exclaim", "Exclamation Mark", SDL_SCANCODE_1, 1},
{"!", 0, SDL_SCANCODE_1, 1},
{"At", "@", SDL_SCANCODE_2, 1},
{"Hash", "#", SDL_SCANCODE_3, 1},
{"Dollar", "$", SDL_SCANCODE_4, 1},
{"Percent", "%", SDL_SCANCODE_5, 1},
{"Caret", "^", SDL_SCANCODE_6, 1},
{"Ampersand", "&", SDL_SCANCODE_7, 1},
{"Asterisk", "*", SDL_SCANCODE_8, 1},
{"Left Paren", "(", SDL_SCANCODE_9, 1},
{"Right Paren", ")", SDL_SCANCODE_0, 1},
{"Underscore", "_", SDL_SCANCODE_MINUS, 1},
{"Plus", "+", SDL_SCANCODE_EQUALS, 1},
{"Left Brace", "{", SDL_SCANCODE_LEFTBRACKET, 1},
{"Right Brace", "}", SDL_SCANCODE_RIGHTBRACKET, 1},
{"Pipe", "|", SDL_SCANCODE_BACKSLASH, 1},
{"Colon", ":", SDL_SCANCODE_SEMICOLON, 1},
{"Double Quote", "\"", SDL_SCANCODE_APOSTROPHE, 1},
{"Less Than", "<", SDL_SCANCODE_COMMA, 1},
{"Greater Than", ">", SDL_SCANCODE_PERIOD, 1},
{"Question Mark", "?", SDL_SCANCODE_SLASH, 1},
{"Question", 0, SDL_SCANCODE_SLASH, 1},
{"Tilde", "~", SDL_SCANCODE_GRAVE, 1}
};
// @OPTIMIZE: sort key_names; do a binary search
for (size_t i = 0; i < arr_count(key_names); ++i) {
KeyName const *k = &key_names[i];
if (streq(str, k->keyname1) || (k->keyname2 && streq(str, k->keyname2))) {
scancode = k->scancode;
if (k->shift) {
if (modifier & KEY_MODIFIER_SHIFT) {
ted_seterr(ted, "%s:%u: Shift+%s is redundant.", filename, line_number, str);
return 0;
}
modifier |= KEY_MODIFIER_SHIFT;
}
break;
}
}
if (scancode == SDL_SCANCODE_UNKNOWN) {
if (isdigit(str[0])) { // direct scancode numbers, e.g. Ctrl+24 or Ctrl+08
char *endp;
long n = strtol(str, &endp, 10);
if (*endp == '\0' && n > 0 && n < SCANCODE_COUNT) {
scancode = (SDL_Scancode)n;
} else {
ted_seterr(ted, "%s:%u: Invalid scancode number: %s", filename, line_number, str);
return 0;
}
} else {
ted_seterr(ted, "%s:%u: Unrecognized key name: %s.", filename, line_number, str);
return 0;
}
}
}
return (u32)scancode << 3 | modifier;
}
void config_read(Ted *ted, char const *filename) {
FILE *fp = fopen(filename, "rb");
if (fp) {
uint line_number = 1;
int line_cap = 4096;
char *line = ted_malloc(ted, (size_t)line_cap);
if (line) {
Section section = SECTION_NONE;
while (fgets(line, line_cap, fp)) {
char *newline = strchr(line, '\n');
if (newline || feof(fp)) {
if (newline) *newline = '\0';
bool error = false;
// ok, we've now read a line.
switch (line[0]) {
case '#': // comment
case '\0': // blank line
break;
case '[': { // section header
#define SECTION_HEADER_HELP "Section headers should look like this: [section-name]"
char *closing = strchr(line, ']');
if (!closing) {
ted_seterr(ted, "%s:%u: Unmatched [. " SECTION_HEADER_HELP, filename, line_number);
error = true;
} else if (closing[1] != '\0') {
ted_seterr(ted, "%s:%u: Text after section. " SECTION_HEADER_HELP, filename, line_number);
error = true;
} else {
*closing = '\0';
char *section_name = line + 1;
if (streq(section_name, "keyboard")) {
section = SECTION_KEYBOARD;
} else {
ted_seterr(ted, "%s:%u: Unrecognized section: [%s].", filename, line_number, section_name);
error = true;
}
}
} break;
default: {
char *equals = strchr(line, '=');
if (equals) {
char *key = line;
*equals = '\0';
char *value = key + 1;
while (isspace(*key)) ++key;
while (isspace(*value)) ++value;
if (equals != line) {
for (char *p = equals - 1; p > line; --p) {
// remove trailing spaces after key
if (isspace(*p)) *p = '\0';
else break;
}
}
if (key[0] == '\0') {
ted_seterr(ted, "%s:%u: Empty property name. This line should look like: key = value", filename, line_number);
} else {
switch (section) {
case SECTION_NONE:
ted_seterr(ted, "%s:%u: Line outside of any section."
"Try putting a section header, e.g. [keyboard] before this line?", filename, line_number);
break;
case SECTION_KEYBOARD: {
u32 key_combo = config_parse_key_combo(ted, key, filename, line_number);
(void)key_combo; // @TODO
} break;
}
}
} else {
ted_seterr(ted, "%s:%u: Invalid line syntax."
"Lines should either look like [section-name] or key = value", filename, line_number);
}
} break;
}
if (error) break;
++line_number;
} else {
ted_seterr(ted, "%s:%u: Line is too long.", filename, line_number);
break;
}
}
}
free(line);
if (ferror(fp))
ted_seterr(ted, "Error reading %s.", filename);
fclose(fp);
} else {
ted_seterr(ted, "Couldn't open file %s.", filename);
}
}
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