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Added hex and binary character encoding to strings

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Use '\b' and '\x' to encode characters in strings!
This commit is contained in:
CPunch 2021-01-19 12:22:20 -06:00
parent c7116ab752
commit d690c3040d
1 changed files with 47 additions and 5 deletions
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52
src/clex.c
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@ -151,6 +151,10 @@ char next(CLexState *state) {
return state->currentChar[-1]; return state->currentChar[-1];
} }
bool isHex(char c) {
return isNumerical(c) || ('A' <= c && 'F' >= c) || ('a' <= c && 'f' >= c);
}
CTokenType identifierType(CLexState *state) { CTokenType identifierType(CLexState *state) {
int length = state->currentChar - state->startChar; int length = state->currentChar - state->startChar;
@ -206,6 +210,48 @@ CToken parseString(CLexState *state) {
case 't': appendBuffer(state, '\t'); break; case 't': appendBuffer(state, '\t'); break;
case '\\': appendBuffer(state, '\\'); break; case '\\': appendBuffer(state, '\\'); break;
case '"': appendBuffer(state, '"'); break; case '"': appendBuffer(state, '"'); break;
case 'x': // hexadecimal character encoding
next(state); // skip 'x'
if (isHex(peek(state))) {
char *numStart = state->currentChar;
// consume the hexnum
while (isHex(peek(state)))
next(state);
state->currentChar--; // since next() is called after
unsigned int num = (unsigned int)strtoul(numStart, NULL, 16);
if (num > 255) // sanity check
return makeError(state, "Character out of range! > 255!");
appendBuffer(state, num);
break;
}
return makeError(state, "Unknown hexadecimal character encoding!");
case 'b': // binary character encoding
next(state); // skip 'b'
if (peek(state) == '0' || peek(state) == '1') {
char *numStart = state->currentChar;
// consume the bin
while (peek(state) == '0' || peek(state) == '1')
next(state);
state->currentChar--; // since next() is called after
unsigned int num = (unsigned int)strtoul(numStart, NULL, 2);
if (num > 255) // sanity check
return makeError(state, "Character out of range! > 255!");
appendBuffer(state, num);
break;
}
return makeError(state, "Unknown binary character encoding!");
default: { default: {
if (isNumerical(peek(state))) { if (isNumerical(peek(state))) {
char *numStart = state->currentChar; char *numStart = state->currentChar;
@ -215,7 +261,7 @@ CToken parseString(CLexState *state) {
next(state); next(state);
state->currentChar--; // since next() is called after state->currentChar--; // since next() is called after
int num = (int)strtol(numStart, NULL, 10); unsigned int num = (unsigned int)strtoul(numStart, NULL, 10);
if (num > 255) // sanity check if (num > 255) // sanity check
return makeError(state, "Character out of range! > 255!"); return makeError(state, "Character out of range! > 255!");
@ -245,10 +291,6 @@ CToken parseString(CLexState *state) {
return makeToken(state, TOKEN_STRING); return makeToken(state, TOKEN_STRING);
} }
bool isHex(char c) {
return isNumerical(c) || ('A' <= c && 'F' >= c) || ('a' <= c && 'f' >= c);
}
CToken parseNumber(CLexState *state) { CToken parseNumber(CLexState *state) {
switch (peek(state)) { switch (peek(state)) {
case 'x': // hexadecimal number case 'x': // hexadecimal number