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rust: Create readable messages for query syntax errors

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This commit is contained in:
Max Brunsfeld 2019-09-26 15:58:41 -07:00
parent a45dc67390
commit 324c259cbb
2 changed files with 65 additions and 11 deletions
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24
lib/binding_rust/lib.rs
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@ -186,7 +186,7 @@ pub struct QueryCapture<'a> {
#[derive(Debug, PartialEq, Eq)]
pub enum QueryError {
Syntax(usize),
Syntax(String),
NodeType(String),
Field(String),
Capture(String),
@ -997,6 +997,24 @@ impl Query {
// On failure, build an error based on the error code and offset.
if ptr.is_null() {
let offset = error_offset as usize;
let mut line_start = 0;
let line_containing_error = source.split("\n").find_map(|line| {
let line_end = line_start + line.len() + 1;
if line_end > offset {
Some(line)
} else {
line_start = line_end;
None
}
});
let message = if let Some(line) = line_containing_error {
line.to_string() + "\n" + &" ".repeat(offset - line_start) + "^"
} else {
"Unexpected EOF".to_string()
};
// if line_containing_error
return if error_type != ffi::TSQueryError_TSQueryErrorSyntax {
let suffix = source.split_at(offset).1;
let end_offset = suffix
@ -1007,10 +1025,10 @@ impl Query {
ffi::TSQueryError_TSQueryErrorNodeType => Err(QueryError::NodeType(name)),
ffi::TSQueryError_TSQueryErrorField => Err(QueryError::Field(name)),
ffi::TSQueryError_TSQueryErrorCapture => Err(QueryError::Capture(name)),
_ => Err(QueryError::Syntax(offset)),
_ => Err(QueryError::Syntax(message)),
}
} else {
Err(QueryError::Syntax(offset))
Err(QueryError::Syntax(message))
};
}