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better char lexing

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This commit is contained in:
Aleksey Kladov 2018-08-18 12:13:34 +03:00
parent c7b1be6be3
commit a5eeef0eee
3 changed files with 27 additions and 13 deletions
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24
crates/libsyntax2/src/lexer/strings.rs
View file

@ -15,14 +15,23 @@ pub(crate) fn is_string_literal_start(c: char, c1: Option<char>, c2: Option<char
}
pub(crate) fn scan_char(ptr: &mut Ptr) {
if ptr.bump().is_none() {
return; // TODO: error reporting is upper in the stack
loop {
if ptr.next_is('\\') {
ptr.bump();
if ptr.next_is('\\') || ptr.next_is('\'') {
ptr.bump();
}
scan_char_or_byte(ptr);
if !ptr.next_is('\'') {
return; // TODO: error reporting
continue;
}
if ptr.next_is('\'') {
ptr.bump();
return;
}
if ptr.next_is('\n') {
break;
}
ptr.bump();
}
}
pub(crate) fn scan_byte_char_or_string(ptr: &mut Ptr) -> SyntaxKind {
@ -111,8 +120,3 @@ fn scan_raw_byte_string(ptr: &mut Ptr) {
}
}
}
fn scan_char_or_byte(ptr: &mut Ptr) {
//FIXME: deal with escape sequencies
ptr.bump();
}

2
crates/libsyntax2/tests/data/lexer/0006_chars.rs
View file

@ -1 +1 @@
'x' ' ' '0'
'x' ' ' '0' 'hello' '\x7f' '\n' '\\' '\''

10
crates/libsyntax2/tests/data/lexer/0006_chars.txt
View file

@ -3,4 +3,14 @@ WHITESPACE 1 " "
CHAR 3 "\' \'"
WHITESPACE 1 " "
CHAR 3 "\'0\'"
WHITESPACE 1 " "
CHAR 7 "\'hello\'"
WHITESPACE 1 " "
CHAR 6 "\'\\x7f\'"
WHITESPACE 1 " "
CHAR 4 "\'\\n\'"
WHITESPACE 1 " "
CHAR 4 "\'\\\\\'"
WHITESPACE 1 " "
CHAR 4 "\'\\\'\'"
WHITESPACE 1 "\n"