Generate SyntaxError at integer starting with 0

HyeockJinKim · HyeockJinKim · commit 01b66670d4cb · 2019-09-29T00:00:45.000+09:00
Generate syntaxError at integer starting with 0, not zero Fixes #1422
diff --git a/parser/src/lexer.rs b/parser/src/lexer.rs
@@ -15,6 +15,7 @@ use std::str::FromStr;
 use unic_emoji_char::is_emoji_presentation;
 use unicode_xid::UnicodeXID;
 use wtf8;
+use num_traits::identities::Zero;
 
 #[derive(Clone, Copy, PartialEq, Debug, Default)]
 struct IndentationLevel {
@@ -352,7 +353,7 @@ where
     /// Lex a normal number, that is, no octal, hex or binary number.
     fn lex_normal_number(&mut self) -> LexResult {
         let start_pos = self.get_pos();
-
+        let start_is_zero = self.chr0 == Some('0');
         // Normal number:
         let mut value_text = self.radix_run(10);
 
@@ -403,6 +404,12 @@ where
             } else {
                 let end_pos = self.get_pos();
                 let value = value_text.parse::<BigInt>().unwrap();
+                if start_is_zero && !value.is_zero() {
+                    return Err(LexicalError {
+                        error: LexicalErrorType::OtherError("Invalid Token".to_string()),
+                        location: self.get_pos(),
+                    });
+                }
                 Ok((start_pos, Tok::Int { value }, end_pos))
             }
         }
