Implement octal literals

Octal literals use the prefix '0o'.

2 files changed, 9 insertions, 0 deletions

diff --git a/src/stages/syntactic.rs b/src/stages/syntactic.rs
index 45d5e60..a1ba833 100644
--- a/src/stages/syntactic.rs
+++ b/src/stages/syntactic.rs
@@ -184,6 +184,12 @@ fn parse_syntactic_from_tokeniser(mut t: Tokeniser) -> Result<Vec<Tracked<Syntac
                         Ok(value) => SyntacticToken::IntegerLiteral(value),
                         Err(_) => err!(SyntacticError::InvalidBinaryLiteral(binary_string)),
                     }
+                } else if let Some(octal_string) = stripped.strip_prefix("0o") {
+                    let octal_string = octal_string.to_string();
+                    match parse_integer_literal(&octal_string, 8, neg) {
+                        Ok(value) => SyntacticToken::IntegerLiteral(value),
+                        Err(_) => err!(SyntacticError::InvalidOctalLiteral(octal_string)),
+                    }
                 } else {
                     let decimal_string = stripped.to_string();
                     match parse_integer_literal(&decimal_string, 10, neg) {
diff --git a/src/stages/syntactic_tokens.rs b/src/stages/syntactic_tokens.rs
index 041c568..5bfa0be 100644
--- a/src/stages/syntactic_tokens.rs
+++ b/src/stages/syntactic_tokens.rs
@@ -70,6 +70,7 @@ pub enum SyntacticError {
     InvalidDecimalLiteral(String),
     InvalidHexadecimalLiteral(String),
     InvalidBinaryLiteral(String),
+    InvalidOctalLiteral(String),
 }
 
 
@@ -118,6 +119,8 @@ fn report_syntactic_error(error: &Tracked<SyntacticError>, source_code: &str) {
             &format!("The string '{string}' is not a valid hexadecimal literal"),
         SyntacticError::InvalidBinaryLiteral(string) =>
             &format!("The string '{string}' is not a valid binary literal"),
+        SyntacticError::InvalidOctalLiteral(string) =>
+            &format!("The string '{string}' is not a valid octal literal"),
     };
 
     report_source_issue(LogLevel::Error, &context, message);