feat: add bin/oct/hex literal

crates/erg_compiler/context/eval.rs

@@ -48,7 +48,7 @@ pub fn type_from_token_kind(kind: TokenKind) -> Type {
     use TokenKind::*;
 
     match kind {
-        NatLit => Type::Nat,
+        NatLit | BinLit | OctLit | HexLit => Type::Nat,
         IntLit => Type::Int,
         RatioLit => Type::Ratio,
         StrLit | DocComment => Type::Str,

crates/erg_compiler/ty/value.rs

@@ -920,12 +920,29 @@ impl ValueObj {
     pub fn from_str(t: Type, mut content: Str) -> Option<Self> {
         match t {
             Type::Int => content.replace('_', "").parse::<i32>().ok().map(Self::Int),
-            Type::Nat => content
+            Type::Nat => {
+                let content = content
                     .trim_start_matches('-') // -0 -> 0
-                .replace('_', "")
+                    .replace('_', "");
-                .parse::<u64>()
+                if content.len() <= 1 {
-                .ok()
+                    return content.parse::<u64>().ok().map(Self::Nat);
-                .map(Self::Nat),
+                }
+                match &content[0..=1] {
+                    pre @ ("0b" | "0B") => {
+                        let content = content.trim_start_matches(pre);
+                        u64::from_str_radix(content, 2).ok().map(Self::Nat)
+                    }
+                    pre @ ("0o" | "0O") => {
+                        let content = content.trim_start_matches(pre);
+                        u64::from_str_radix(content, 8).ok().map(Self::Nat)
+                    }
+                    pre @ ("0x" | "0X") => {
+                        let content = content.trim_start_matches(pre);
+                        u64::from_str_radix(content, 16).ok().map(Self::Nat)
+                    }
+                    _ => content.parse::<u64>().ok().map(Self::Nat),
+                }
+            }
             Type::Float => content
                 .replace('_', "")
                 .parse::<f64>()

crates/erg_parser/lex.rs

@@ -621,6 +621,18 @@ impl Lexer /*<'a>*/ {
                 n if n.is_ascii_digit() || n == '_' => {
                     num.push(self.consume().unwrap());
                 }
+                'b' | 'B' => {
+                    num.push(self.consume().unwrap());
+                    return self.lex_bin(num);
+                }
+                'o' | 'O' => {
+                    num.push(self.consume().unwrap());
+                    return self.lex_oct(num);
+                }
+                'x' | 'X' => {
+                    num.push(self.consume().unwrap());
+                    return self.lex_hex(num);
+                }
                 c if Self::is_valid_continue_symbol_ch(c) => {
                     // exponent (e.g. 10e+3)
                     if c == 'e'
@@ -682,6 +694,39 @@ impl Lexer /*<'a>*/ {
         }
     }
 
+    fn lex_bin(&mut self, mut num: String) -> LexResult<Token> {
+        while let Some(cur) = self.peek_cur_ch() {
+            if cur == '0' || cur == '1' || cur == '_' {
+                num.push(self.consume().unwrap());
+            } else {
+                break;
+            }
+        }
+        Ok(self.emit_token(BinLit, &num))
+    }
+
+    fn lex_oct(&mut self, mut num: String) -> LexResult<Token> {
+        while let Some(cur) = self.peek_cur_ch() {
+            if matches!(cur, '0'..='7') || cur == '_' {
+                num.push(self.consume().unwrap());
+            } else {
+                break;
+            }
+        }
+        Ok(self.emit_token(OctLit, &num))
+    }
+
+    fn lex_hex(&mut self, mut num: String) -> LexResult<Token> {
+        while let Some(cur) = self.peek_cur_ch() {
+            if cur.is_ascii_hexdigit() || cur == '_' {
+                num.push(self.consume().unwrap());
+            } else {
+                break;
+            }
+        }
+        Ok(self.emit_token(HexLit, &num))
+    }
+
     /// int_part_and_point must be like `12.`
     fn lex_ratio(&mut self, intpart_and_point: String) -> LexResult<Token> {
         let mut num = intpart_and_point;
@@ -1547,7 +1592,7 @@ impl Iterator for Lexer /*<'a>*/ {
                     None,
                 )))
             }
-            // IntLit or RatioLit
+            // IntLit (or Bin/Oct/Hex) or RatioLit
             Some(n) if n.is_ascii_digit() => Some(self.lex_num(n)),
             // Symbol (includes '_')
             Some(c) if Self::is_valid_start_symbol_ch(c) => Some(self.lex_symbol(c)),

crates/erg_parser/token.rs

@@ -24,6 +24,12 @@ pub enum TokenKind {
     NatLit,
     /// e.g. -1, -2
     IntLit,
+    /// e.g. 0b101
+    BinLit,
+    /// e.g. 0o777
+    OctLit,
+    /// e.g. 0xdeadbeef
+    HexLit,
     RatioLit,
     BoolLit,
     StrLit,
@@ -232,8 +238,8 @@ impl TokenKind {
     pub const fn category(&self) -> TokenCategory {
         match self {
             Symbol => TokenCategory::Symbol,
-            NatLit | IntLit | RatioLit | StrLit | BoolLit | NoneLit | EllipsisLit | InfLit
+            NatLit | BinLit | OctLit | HexLit | IntLit | RatioLit | StrLit | BoolLit | NoneLit
-            | DocComment => TokenCategory::Literal,
+            | EllipsisLit | InfLit | DocComment => TokenCategory::Literal,
             StrInterpLeft => TokenCategory::StrInterpLeft,
             StrInterpMid => TokenCategory::StrInterpMid,
             StrInterpRight => TokenCategory::StrInterpRight,

tests/should_ok/decimal.er

@@ -0,0 +1,8 @@
+b = 0b010010
+assert b == 18
+
+o = 0o22
+assert o == 18
+
+h = 0x12
+assert h == 18

tests/test.rs

@@ -52,6 +52,11 @@ fn exec_control_expr() -> Result<(), ()> {
     expect_success("tests/should_ok/control_expr.er", 3)
 }
 
+#[test]
+fn exec_decimal() -> Result<(), ()> {
+    expect_success("tests/should_ok/decimal.er", 0)
+}
+
 #[test]
 fn exec_default_param() -> Result<(), ()> {
     expect_success("tests/should_ok/default_param.er", 0)