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-rw-r--r--src/lexer.rs49
1 files changed, 41 insertions, 8 deletions
diff --git a/src/lexer.rs b/src/lexer.rs
index e8ef2ac..5f028b0 100644
--- a/src/lexer.rs
+++ b/src/lexer.rs
@@ -179,14 +179,48 @@ impl<'input> Lexer<'input> {
&self.input[self.offset..]
}
- fn skip_whitespace(&mut self) {
+ fn skip_whitespace(&mut self) -> bool {
let input = self.current_input();
let trimmed = input.trim_left();
let whitespace_len = input.len() - trimmed.len();
- if whitespace_len > 0 {
- //println!("skipped {} whitespace bytes", whitespace_len);
+ let skipped = whitespace_len > 0;
+ if skipped {
+ // println!("skipped {} whitespace bytes in {}..{}", whitespace_len, self.offset, self.offset + whitespace_len);
self.offset += whitespace_len;
}
+ skipped
+ }
+
+ fn skip_comments(&mut self) -> bool {
+ let input = self.current_input();
+ if !input.is_char_boundary(0) || !input.is_char_boundary(2) {
+ return false;
+ }
+ let skip = match &input[0..2] {
+ "{-" => {
+ if let Some(i) = input.find("-}") {
+ // println!("skipped {} bytes of block comment", i + 2);
+ i + 2
+ } else {
+ 0
+ }
+ }
+ "--" => {
+ if let Some(i) = input.find("\n") { // FIXME Find CRLF too
+ // println!("skipped {} bytes of line comment", i + 1);
+ i + 1
+ } else {
+ 0
+ }
+ }
+ _ => 0,
+ };
+ self.offset += skip;
+ skip != 0
+ }
+
+ fn skip_comments_and_whitespace(&mut self) {
+ while self.skip_whitespace() || self.skip_comments() {}
}
}
@@ -194,13 +228,12 @@ impl<'input> Iterator for Lexer<'input> {
type Item = Spanned<Tok, usize, LexicalError>;
fn next(&mut self) -> Option<Self::Item> {
- if self.offset >= self.input.len() {
- return None;
- }
-
use nom::IResult::*;
- self.skip_whitespace();
+ self.skip_comments_and_whitespace();
let input = self.current_input();
+ if input.len() == 0 {
+ return None;
+ }
match token(input) {
Done(rest, t) => {
let parsed_len = input.len() - rest.len();