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feat: add error messages

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This commit is contained in:
Fernando Araoz 2025-01-31 19:25:08 -05:00
parent 63d618e06f
commit dca3241aa2
1 changed files with 28 additions and 3 deletions
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31
src/02_syntax/variable.zig
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@ -30,14 +30,13 @@ pub const VariableBinding = struct {
// check there is still input // check there is still input
if (pos + 1 >= tokens.items.len) { if (pos + 1 >= tokens.items.len) {
// return error
var err = try ctx.create_and_append_error( var err = try ctx.create_and_append_error(
"Incomplete variable declaration", "Incomplete variable declaration",
var_keyword.start_pos, var_keyword.start_pos,
var_keyword.start_pos + var_keyword.value.len, var_keyword.start_pos + var_keyword.value.len,
); );
try err.add_label(ctx.create_error_label( try err.add_label(ctx.create_error_label(
"This variable declaration is incomplete", "Expected an identifier after this `var`",
var_keyword.start_pos, var_keyword.start_pos,
var_keyword.start_pos + var_keyword.value.len, var_keyword.start_pos + var_keyword.value.len,
)); ));
@ -65,8 +64,34 @@ pub const VariableBinding = struct {
}; };
// parse equal sign // parse equal sign
if (pos + 2 >= tokens.items.len) return ParseError.Error; if (pos + 2 >= tokens.items.len) {
var err = try ctx.create_and_append_error(
"Incomplete variable declaration",
identifier.start_pos,
identifier.start_pos + identifier.value.len,
);
try err.add_label(ctx.create_error_label(
"Expected a equal sign `=` after this identifier",
identifier.start_pos,
identifier.start_pos + identifier.value.len,
));
return ParseError.Error;
}
const equal_sign = if (utils.expect_operator("=", &tokens.items[pos + 2])) |x| x else { const equal_sign = if (utils.expect_operator("=", &tokens.items[pos + 2])) |x| x else {
const faulty_token = &tokens.items[pos + 2];
var err = try ctx.create_and_append_error(
"Invalid variable declaration",
faulty_token.start_pos,
faulty_token.start_pos + faulty_token.value.len,
);
const token_name = faulty_token.token_type.to_string();
const error_name = try std.fmt.allocPrint(ctx.allocator, "Expected an equal sign `=` here, found a {s}", .{token_name});
try err.add_label(ctx.create_error_label_alloc(
error_name,
faulty_token.start_pos,
faulty_token.start_pos + faulty_token.value.len,
));
return ParseError.Error; return ParseError.Error;
}; };
_ = equal_sign; _ = equal_sign;