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Merge pull request #48 from elferherrera/parse-error

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Error check on def and alias
This commit is contained in:
JT 2021-09-14 15:03:18 +12:00 committed by GitHub
commit 7b54e5c4ab
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 52 additions and 24 deletions
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8
crates/nu-cli/src/errors.rs
View file

@ -261,6 +261,14 @@ pub fn report_parsing_error(
.with_labels(vec![Label::primary(diag_file_id, diag_range)
.with_message("needs a parameter name")])
}
ParseError::AssignmentMismatch(msg, label, span) => {
let (diag_file_id, diag_range) = convert_span_to_diag(working_set, span)?;
Diagnostic::error()
.with_message(msg)
.with_labels(vec![
Label::primary(diag_file_id, diag_range).with_message(label)
])
}
};
// println!("DIAG");

1
crates/nu-parser/src/errors.rs
View file

@ -30,4 +30,5 @@ pub enum ParseError {
RestNeedsName(Span),
ExtraColumns(usize, Span),
MissingColumns(usize, Span),
AssignmentMismatch(String, String, Span),
}

67
crates/nu-parser/src/parser.rs
View file

@ -63,16 +63,35 @@ fn check_call(command: Span, sig: &Signature, call: &Call) -> Option<ParseError>
}
}
fn check_name(working_set: &mut StateWorkingSet, spans: &[Span]) -> Option<ParseError> {
if spans[1..].len() < 2 {
Some(ParseError::UnknownState(
"missing definition name".into(),
span(spans),
))
fn check_name<'a>(
working_set: &mut StateWorkingSet,
spans: &'a [Span],
) -> Option<(&'a Span, ParseError)> {
if spans.len() == 1 {
None
} else if spans.len() < 4 {
if working_set.get_span_contents(spans[1]) == b"=" {
let name = String::from_utf8_lossy(working_set.get_span_contents(spans[0]));
Some((
&spans[1],
ParseError::AssignmentMismatch(
format!("{} missing name", name),
"missing name".into(),
spans[1],
),
))
} else {
None
}
} else if working_set.get_span_contents(spans[2]) != b"=" {
Some(ParseError::UnknownState(
"missing equal sign in definition".into(),
span(spans),
let name = String::from_utf8_lossy(working_set.get_span_contents(spans[0]));
Some((
&spans[2],
ParseError::AssignmentMismatch(
format!("{} missing sign", name),
"missing equal sign".into(),
spans[2],
),
))
} else {
None
@ -2490,7 +2509,7 @@ pub fn parse_def(
(
garbage_statement(spans),
Some(ParseError::UnknownState(
"definition unparseable. Expected structure: def <name> [] {}".into(),
"Expected structure: def <name> [] {}".into(),
span(spans),
)),
)
@ -2504,9 +2523,9 @@ pub fn parse_alias(
let name = working_set.get_span_contents(spans[0]);
if name == b"alias" {
if let Some(err) = check_name(working_set, spans) {
if let Some((span, err)) = check_name(working_set, spans) {
return (
Statement::Pipeline(Pipeline::from_vec(vec![garbage(span(spans))])),
Statement::Pipeline(Pipeline::from_vec(vec![garbage(*span)])),
Some(err),
);
}
@ -2562,9 +2581,9 @@ pub fn parse_let(
let name = working_set.get_span_contents(spans[0]);
if name == b"let" {
if let Some(err) = check_name(working_set, spans) {
if let Some((span, err)) = check_name(working_set, spans) {
return (
Statement::Pipeline(Pipeline::from_vec(vec![garbage(span(spans))])),
Statement::Pipeline(Pipeline::from_vec(vec![garbage(*span)])),
Some(err),
);
}
@ -2606,16 +2625,16 @@ pub fn parse_statement(
working_set: &mut StateWorkingSet,
spans: &[Span],
) -> (Statement, Option<ParseError>) {
// FIXME: improve errors by checking keyword first
if let (decl, None) = parse_def(working_set, spans) {
(decl, None)
} else if let (stmt, None) = parse_let(working_set, spans) {
(stmt, None)
} else if let (stmt, None) = parse_alias(working_set, spans) {
(stmt, None)
} else {
let (expr, err) = parse_expression(working_set, spans);
(Statement::Pipeline(Pipeline::from_vec(vec![expr])), err)
let name = working_set.get_span_contents(spans[0]);
match name {
b"def" => parse_def(working_set, spans),
b"let" => parse_let(working_set, spans),
b"alias" => parse_alias(working_set, spans),
_ => {
let (expr, err) = parse_expression(working_set, spans);
(Statement::Pipeline(Pipeline::from_vec(vec![expr])), err)
}
}
}