From b1d0e22b1f5fe907ba3d48931e5a38b9a75b0dcf Mon Sep 17 00:00:00 2001 From: Vincent Ambo Date: Sun, 17 Jan 2021 21:13:57 +0300 Subject: chore(tazjin/rlox): Move other modules under treewalk:: It's unclear if the second part of the book can reuse anything from the first part (I'm guessing probably the scanner, but I'll move that back if it turns out to be the case). Change-Id: I9411355929e31ac6e953599e51665406b1f48d55 Reviewed-on: https://cl.tvl.fyi/c/depot/+/2415 Reviewed-by: tazjin Tested-by: BuildkiteCI --- users/tazjin/rlox/src/treewalk/errors.rs | 38 ++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 users/tazjin/rlox/src/treewalk/errors.rs (limited to 'users/tazjin/rlox/src/treewalk/errors.rs') diff --git a/users/tazjin/rlox/src/treewalk/errors.rs b/users/tazjin/rlox/src/treewalk/errors.rs new file mode 100644 index 000000000000..3d5c28f9f3bb --- /dev/null +++ b/users/tazjin/rlox/src/treewalk/errors.rs @@ -0,0 +1,38 @@ +use crate::treewalk::interpreter::Value; + +#[derive(Debug)] +pub enum ErrorKind { + UnexpectedChar(char), + UnterminatedString, + UnmatchedParens, + ExpectedExpression(String), + ExpectedSemicolon, + ExpectedClosingBrace, + ExpectedToken(&'static str), + TypeError(String), + UndefinedVariable(String), + InternalError(String), + InvalidAssignmentTarget(String), + RuntimeError(String), + StaticError(String), + + // This variant is not an error, rather it is used for + // short-circuiting out of a function body that hits a `return` + // statement. + // + // It's implemented this way because in the original book the + // author uses exceptions for control flow, and this is the + // closest equivalent that I had available without diverging too + // much. + FunctionReturn(Value), +} + +#[derive(Debug)] +pub struct Error { + pub line: usize, + pub kind: ErrorKind, +} + +pub fn report(err: &Error) { + eprintln!("[line {}] Error: {:?}", err.line, err.kind); +} -- cgit 1.4.1