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authorVincent Ambo <mail@tazj.in>2021-01-17T18·13+0300
committertazjin <mail@tazj.in>2021-01-17T21·17+0000
commitb1d0e22b1f5fe907ba3d48931e5a38b9a75b0dcf (patch)
treeaaed1a8bf4cd3bde2f3fd63980ce3d98928155c5 /users/tazjin/rlox/src/treewalk/errors.rs
parentc26915d0120e8577cd684eb9c4f2694e1727cb4a (diff)
chore(tazjin/rlox): Move other modules under treewalk:: r/2126
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 <mail@tazj.in>
Tested-by: BuildkiteCI
Diffstat (limited to 'users/tazjin/rlox/src/treewalk/errors.rs')
-rw-r--r--users/tazjin/rlox/src/treewalk/errors.rs38
1 files changed, 38 insertions, 0 deletions
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);
+}