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Removed .charAt(), added .char() & .byte()
- also minor comment fixes in cobj.[ch]
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@ -258,28 +258,54 @@ int cosmoB_sSplit(CState *state, int nargs, CValue *args) {
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return 1;
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}
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// string.charAt
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int cosmoB_sCharAt(CState *state, int nargs, CValue *args) {
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if (nargs != 2) {
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cosmoV_error(state, "string.charAt() expected 2 arguments, got %d!", nargs);
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// string.byte
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int cosmoB_sByte(CState *state, int nargs, CValue *args) {
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if (nargs != 1) {
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cosmoV_error(state, "string.byte() expected 1 argument, got %d!", nargs);
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return 0;
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}
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if (!IS_STRING(args[0]) || !IS_NUMBER(args[1])) {
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cosmoV_typeError(state, "string.charAt", "<string>, <number>", "%s, %s", cosmoV_typeStr(args[0]), cosmoV_typeStr(args[1]));
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if (!IS_STRING(args[0])) {
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cosmoV_typeError(state, "string.byte", "<string>", "%s", cosmoV_typeStr(args[0]));
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return 0;
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}
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CObjString *str = cosmoV_readString(args[0]);
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int indx = (int)cosmoV_readNumber(args[1]);
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if (indx >= str->length || indx < 0) {
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cosmoV_error(state, "string.charAt() expected index to be 0-%d, got %d!", str->length - 1, indx);
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if (str->length < 1) {
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// the length of the string is less than 1, in the future I might throw an error for this, but
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// for now im going to copy lua and just return a nil
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return 0;
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}
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// returns character number
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cosmoV_pushNumber(state, (int)str->str[indx]);
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// push the character byte and return
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cosmoV_pushNumber(state, (int)str->str[0]);
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return 1;
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}
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// string.char
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int cosmoB_sChar(CState *state, int nargs, CValue *args) {
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if (nargs != 1) {
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cosmoV_error(state, "string.char() expected 1 argument, got %d!", nargs);
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return 0;
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}
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if (!IS_NUMBER(args[0])) {
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cosmoV_typeError(state, "string.char", "<number>", "%s", cosmoV_typeStr(args[0]));
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return 0;
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}
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// small side effect of truncating the number, but ignoring the decimal instead of throwing an error is the better option imo
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int num = (int)cosmoV_readNumber(args[0]);
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char c = num;
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if (num > 255 || num < 0) {
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cosmoV_error(state, "Character expected to be in range 0-255, got %d!", num);
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return 0;
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}
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// basically, treat the c value on the stack as an """"array"""" with a length of 1
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cosmoV_pushLString(state, &c, 1);
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return 1;
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}
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@ -288,14 +314,16 @@ void cosmoB_loadStrLib(CState *state) {
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"sub",
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"find",
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"split",
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"charAt"
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"byte",
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"char"
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};
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CosmoCFunction strLib[] = {
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cosmoB_sSub,
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cosmoB_sFind,
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cosmoB_sSplit,
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cosmoB_sCharAt
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cosmoB_sByte,
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cosmoB_sChar
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};
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// make string library object
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@ -14,7 +14,8 @@ COSMO_API void cosmoB_loadLibrary(CState *state);
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- string.sub
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- stirng.find
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- string.split
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- string.charAt
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- string.byte
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- string.char
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The base proto object for strings is also set, allowing you to invoke the string.* api through string objects, eg.
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`"hello world":split(" ")` is equivalent to `string.split("hello world", " ")`
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@ -213,7 +213,7 @@ CObjString *cosmoO_copyString(CState *state, const char *str, size_t length) {
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return cosmoO_allocateString(state, buf, length, hash);
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}
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// length shouldn't include the null terminator! (char array should also have been allocated using cosmoM_xmalloc!)
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// length shouldn't include the null terminator! str should be a null terminated string! (char array should also have been allocated using cosmoM_xmalloc!)
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CObjString *cosmoO_takeString(CState *state, char *str, size_t length) {
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uint32_t hash = hashString(str, length);
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14
src/cobj.h
14
src/cobj.h
@ -44,7 +44,7 @@ typedef struct CObjString {
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CommonHeader; // "is a" CObj
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bool isIString;
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int length;
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char *str;
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char *str; // NULL termincated string
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uint32_t hash; // for hashtable lookup
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} CObjString;
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@ -168,12 +168,14 @@ int cosmoO_getUserI(CState *state, CObjObject *object);
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// internal string
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bool cosmoO_getIString(CState *state, CObjObject *object, int flag, CValue *val);
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// copies the *str buffer to the heap and returns a CObjString struct which is also on the heap
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CObjString *cosmoO_copyString(CState *state, const char *str, size_t sz);
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// pass an already allocated str buffer!
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CObjString *cosmoO_takeString(CState *state, char *str, size_t sz);
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// copies the *str buffer to the heap and returns a CObjString struct which is also on the heap (length should not include the null terminator)
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CObjString *cosmoO_copyString(CState *state, const char *str, size_t length);
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// length shouldn't include the null terminator! str should be a null terminated string! (char array should also have been allocated using cosmoM_xmalloc!)
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CObjString *cosmoO_takeString(CState *state, char *str, size_t length);
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// allocates a CObjStruct pointing directly to *str
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CObjString *cosmoO_allocateString(CState *state, const char *str, size_t sz, uint32_t hash);
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CObjString *cosmoO_allocateString(CState *state, const char *str, size_t length, uint32_t hash);
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/*
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formats strings to push onto the VM stack, formatting supported:
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