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// Logic for parsing numbers
#include <ctype.h>
#include <gc.h>
#include <stdarg.h>
#include <stdbool.h>
#include <string.h>
#include <unictype.h>
#include <uniname.h>
#include "../ast.h"
#include "context.h"
#include "errors.h"
#include "utils.h"
static const double RADIANS_PER_DEGREE = 0.0174532925199432957692369076848861271344287188854172545609719144;
ast_t *parse_int(parse_ctx_t *ctx, const char *pos) {
const char *start = pos;
(void)match(&pos, "-");
if (!isdigit(*pos)) return NULL;
if (match(&pos, "0x")) { // Hex
pos += strspn(pos, "0123456789abcdefABCDEF_");
} else if (match(&pos, "0b")) { // Binary
pos += strspn(pos, "01_");
} else if (match(&pos, "0o")) { // Octal
pos += strspn(pos, "01234567_");
} else { // Decimal
pos += strspn(pos, "0123456789_");
}
char *str = GC_MALLOC_ATOMIC((size_t)(pos - start) + 1);
memset(str, 0, (size_t)(pos - start) + 1);
for (char *src = (char *)start, *dest = str; src < pos; ++src) {
if (*src != '_') *(dest++) = *src;
}
if (match(&pos, "e") || match(&pos, "f")) // floating point literal
return NULL;
if (match(&pos, "%")) {
double n = strtod(str, NULL) / 100.;
return NewAST(ctx->file, start, pos, Num, .n = n);
} else if (match(&pos, "deg")) {
double n = strtod(str, NULL) * RADIANS_PER_DEGREE;
return NewAST(ctx->file, start, pos, Num, .n = n);
}
return NewAST(ctx->file, start, pos, Int, .str = str);
}
ast_t *parse_num(parse_ctx_t *ctx, const char *pos) {
const char *start = pos;
bool negative = match(&pos, "-");
if (!isdigit(*pos) && *pos != '.') return NULL;
else if (*pos == '.' && !isdigit(pos[1])) return NULL;
size_t len = strspn(pos, "0123456789_");
if (strncmp(pos + len, "..", 2) == 0) return NULL;
else if (pos[len] == '.') len += 1 + strspn(pos + len + 1, "0123456789");
else if (pos[len] != 'e' && pos[len] != 'f' && pos[len] != '%') return NULL;
if (pos[len] == 'e') {
len += 1;
if (pos[len] == '-') len += 1;
len += strspn(pos + len, "0123456789_");
}
char *buf = GC_MALLOC_ATOMIC(len + 1);
memset(buf, 0, len + 1);
for (char *src = (char *)pos, *dest = buf; src < pos + len; ++src) {
if (*src != '_') *(dest++) = *src;
}
double d = strtod(buf, NULL);
pos += len;
if (negative) d *= -1;
if (match(&pos, "%")) d /= 100.;
else if (match(&pos, "deg")) d *= RADIANS_PER_DEGREE;
return NewAST(ctx->file, start, pos, Num, .n = d);
}
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