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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 "../stdlib/datatypes.h"
#include "../stdlib/integers.h"
#include "../stdlib/optionals.h"
#include "../stdlib/reals.h"
#include "../stdlib/text.h"
#include "context.h"
#include "errors.h"
#include "numbers.h"
#include "utils.h"
ast_t *parse_int(parse_ctx_t *ctx, const char *pos) {
const char *start = pos;
size_t len = 0;
if (start[len] == '-') len += 1;
if (!isdigit(start[len])) return NULL;
if (start[len] == '0') {
if (start[len + 1] == 'x' || start[len + 1] == 'X') { // Hex
len += 2;
len += strspn(start + len, "0123456789abcdefABCDEF_");
} else if (start[len + 1] == 'b' || start[len + 1] == 'B') { // Binary
len += 2;
len += strspn(start + len, "01_");
} else if (start[len + 1] == 'o' || start[len + 1] == 'O') { // Octal
len += 2;
len += strspn(start + len, "01234567_");
} else { // Decimal
len += strspn(start + len, "0123456789_");
}
} else { // Decimal
size_t digits = strspn(start + len, "0123456789_");
if (digits <= 0) {
return NULL;
}
len += digits;
}
// Rational literals: 1.2, 1e2, 1E2, 1%, 1deg
if (start[len] == '.' || start[len] == 'e' || start[len] == 'E' || start[len] == '%'
|| strncmp(start + len, "deg", 3) == 0) {
return NULL;
}
Text_t text = Text$from_strn(start, len);
OptionalInt_t i = Int$parse(text, NONE_INT, NULL);
assert(i.small != 0);
return NewAST(ctx->file, start, start + len, Integer, .i = i);
}
ast_t *parse_num(parse_ctx_t *ctx, const char *pos) {
const char *start = pos;
if (!isdigit(start[0]) && start[0] != '.') return NULL;
else if (start[0] == '.' && !isdigit(start[1])) return NULL;
size_t len = 0;
if (pos[len] == '-') len += 1;
size_t pre_digits = strspn(pos, "0123456789_"), post_digits = 0;
len += pre_digits;
if (pos[len] == '.') {
len += 1;
post_digits = strspn(pos + len, "0123456789_");
len += post_digits;
}
// No digits, no number
if (pre_digits <= 0 && post_digits <= 0) return NULL;
if (pos[len] == 'e' || pos[len] == 'E') {
len += 1;
if (pos[len] == '-') len += 1;
len += strspn(pos + len, "0123456789_");
}
Text_t text = Text$from_strn(start, len);
Text_t remainder;
OptionalReal_t real = Real$parse(text, &remainder);
if (Real$is_none(&real, &Real$info)) return NULL;
pos += len;
if (match(&pos, "%")) {
// The '%' percentage suffix means "divide by 100"
if (!Real$is_zero(real)) real = Real$divided_by(real, Real$from_float64(100.));
} else if (match(&pos, "deg")) {
// The 'deg' suffix means convert from degrees to radians (i.e. 90deg => (90/360)*(2*pi))
if (!Real$is_zero(real)) real = Real$times(Real$divided_by(real, Real$from_float64(360.)), Real$tau);
}
return NewAST(ctx->file, start, pos, Number, .n = real);
}
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