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identifiers must start with alphabetic character

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This commit is contained in:
ConnorSkees 2020-03-21 13:02:24 -04:00
parent 77ed737293
commit f88b4af564
1 changed files with 10 additions and 5 deletions
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15
src/lexer.rs
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@ -281,6 +281,15 @@ impl<'a> Lexer<'a> {
self.buf.next();
self.pos.next_char();
let mut name = String::with_capacity(99);
if let Some(c) = self.buf.next() {
if !c.is_alphabetic() && c != '-' && c != '_' {
eprintln!("Error: Expected identifier.");
std::process::exit(1)
} else {
self.pos.next_char();
name.push(c);
}
}
while let Some(c) = self.buf.peek() {
if !c.is_alphanumeric() && c != &'-' && c != &'_' {
break;
@ -290,11 +299,7 @@ impl<'a> Lexer<'a> {
.next()
.expect("this is impossible because we have already peeked");
self.pos.next_char();
if tok == '_' {
name.push('-');
} else {
name.push(tok);
}
name.push(tok);
}
if name.is_empty() {
TokenKind::Symbol(Symbol::Dollar)