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use lexer::ptr::Ptr;
use lexer::classes::*;
use SyntaxKind::{self, *};
pub(crate) fn scan_number(c: char, ptr: &mut Ptr) -> SyntaxKind {
if c == '0' {
match ptr.next().unwrap_or('\0') {
'b' | 'o' => {
ptr.bump();
scan_digits(ptr, false);
}
'x' => {
ptr.bump();
scan_digits(ptr, true);
}
'0'...'9' | '_' | '.' | 'e' | 'E' => {
scan_digits(ptr, true);
}
_ => return INT_NUMBER,
}
} else {
scan_digits(ptr, false);
}
// might be a float, but don't be greedy if this is actually an
// integer literal followed by field/method access or a range pattern
// (`0..2` and `12.foo()`)
if ptr.next_is('.') && !(ptr.nnext_is('.') || ptr.nnext_is_p(is_ident_start)) {
// might have stuff after the ., and if it does, it needs to start
// with a number
ptr.bump();
scan_digits(ptr, false);
scan_float_exponent(ptr);
return FLOAT_NUMBER;
}
// it might be a float if it has an exponent
if ptr.next_is('e') || ptr.next_is('E') {
scan_float_exponent(ptr);
return FLOAT_NUMBER;
}
INT_NUMBER
}
fn scan_digits(ptr: &mut Ptr, allow_hex: bool) {
while let Some(c) = ptr.next() {
match c {
'_' | '0'...'9' => {
ptr.bump();
}
'a'...'f' | 'A'...'F' if allow_hex => {
ptr.bump();
}
_ => return,
}
}
}
fn scan_float_exponent(ptr: &mut Ptr) {
if ptr.next_is('e') || ptr.next_is('E') {
ptr.bump();
if ptr.next_is('-') || ptr.next_is('+') {
ptr.bump();
}
scan_digits(ptr, false);
}
}
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