mirrors/RustPython-Parser
1
0
Fork 0
mirror of https://github.com/RustPython/Parser.git synced 2025-07-20 19:45:21 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

Provide caret diagnostics for SyntaxError

Browse source 
visualize syntax error with caret diagnostics in shell, eval, exec,
when the error statement and error location are provided.
This commit is contained in:
yanganto 2019-11-21 17:04:32 +08:00
parent a51a3e0e4b
commit 28fbdffdc8
3 changed files with 42 additions and 14 deletions
Download patch file Download diff file Expand all files Collapse all files

46
src/error.rs
View file

@ -7,13 +7,21 @@ use std::fmt;
#[derive(Debug)]
pub struct CompileError {
pub statement: Option<String>,
pub error: CompileErrorType,
pub location: Location,
}
impl CompileError {
pub fn update_statement_info(&mut self, statement: String) {
self.statement = Some(statement);
}
}
impl From<ParseError> for CompileError {
fn from(error: ParseError) -> Self {
CompileError {
statement: None,
error: CompileErrorType::Parse(error.error),
location: error.location,
}
@ -70,21 +78,31 @@ impl CompileError {
impl fmt::Display for CompileError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match &self.error {
CompileErrorType::Assign(target) => write!(f, "can't assign to {}", target),
CompileErrorType::Delete(target) => write!(f, "can't delete {}", target),
CompileErrorType::ExpectExpr => write!(f, "Expecting expression, got statement"),
CompileErrorType::Parse(err) => write!(f, "{}", err),
CompileErrorType::SyntaxError(err) => write!(f, "{}", err),
CompileErrorType::StarArgs => write!(f, "Two starred expressions in assignment"),
CompileErrorType::InvalidBreak => write!(f, "'break' outside loop"),
CompileErrorType::InvalidContinue => write!(f, "'continue' outside loop"),
CompileErrorType::InvalidReturn => write!(f, "'return' outside function"),
CompileErrorType::InvalidYield => write!(f, "'yield' outside function"),
}?;
let error_desc = match &self.error {
CompileErrorType::Assign(target) => format!("can't assign to {}", target),
CompileErrorType::Delete(target) => format!("can't delete {}", target),
CompileErrorType::ExpectExpr => "Expecting expression, got statement".to_string(),
CompileErrorType::Parse(err) => err.to_string(),
CompileErrorType::SyntaxError(err) => err.to_string(),
CompileErrorType::StarArgs => "Two starred expressions in assignment".to_string(),
CompileErrorType::InvalidBreak => "'break' outside loop".to_string(),
CompileErrorType::InvalidContinue => "'continue' outside loop".to_string(),
CompileErrorType::InvalidReturn => "'return' outside function".to_string(),
CompileErrorType::InvalidYield => "'yield' outside function".to_string(),
};
// Print line number:
write!(f, " at {}", self.location)
if self.statement.is_some() && self.location.column() > 0 {
// visualize the error, when location and statement are provided
write!(
f,
"\n{}\n{}",
self.statement.clone().unwrap(),
self.location.visualize(&error_desc)
)
} else {
// print line number
write!(f, "{} at {}", error_desc, self.location)
}
}
}