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|
use crate::SyntaxKind::{self, *};
use crate::lexer::ptr::Ptr;
pub(crate) fn is_string_literal_start(c: char, c1: Option<char>, c2: Option<char>) -> bool {
match (c, c1, c2) {
('r', Some('"'), _)
| ('r', Some('#'), Some('"'))
| ('r', Some('#'), Some('#'))
| ('b', Some('"'), _)
| ('b', Some('\''), _)
| ('b', Some('r'), Some('"'))
| ('b', Some('r'), Some('#')) => true,
_ => false,
}
}
pub(crate) fn scan_char(ptr: &mut Ptr) {
while let Some(c) = ptr.current() {
match c {
'\\' => {
ptr.bump();
if ptr.at('\\') || ptr.at('\'') {
ptr.bump();
}
}
'\'' => {
ptr.bump();
return;
}
'\n' => return,
_ => {
ptr.bump();
}
}
}
}
pub(crate) fn scan_byte_char_or_string(ptr: &mut Ptr) -> SyntaxKind {
// unwrapping and not-exhaustive match are ok
// because of string_literal_start
let c = ptr.bump().unwrap();
match c {
'\'' => {
scan_byte(ptr);
BYTE
}
'"' => {
scan_byte_string(ptr);
BYTE_STRING
}
'r' => {
scan_raw_string(ptr);
RAW_BYTE_STRING
}
_ => unreachable!(),
}
}
pub(crate) fn scan_string(ptr: &mut Ptr) {
while let Some(c) = ptr.current() {
match c {
'\\' => {
ptr.bump();
if ptr.at('\\') || ptr.at('"') {
ptr.bump();
}
}
'"' => {
ptr.bump();
return;
}
_ => {
ptr.bump();
}
}
}
}
pub(crate) fn scan_raw_string(ptr: &mut Ptr) {
let mut hashes = 0;
while ptr.at('#') {
hashes += 1;
ptr.bump();
}
if !ptr.at('"') {
return;
}
ptr.bump();
while let Some(c) = ptr.bump() {
if c == '"' {
let mut hashes_left = hashes;
while ptr.at('#') && hashes_left > 0 {
hashes_left -= 1;
ptr.bump();
}
if hashes_left == 0 {
return;
}
}
}
}
fn scan_byte(ptr: &mut Ptr) {
scan_char(ptr)
}
fn scan_byte_string(ptr: &mut Ptr) {
scan_string(ptr)
}
|
