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FEATURE: Some better error reporting.
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parent
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commit
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13
example_errors/errors_test.ucg
Normal file
13
example_errors/errors_test.ucg
Normal file
@ -0,0 +1,13 @@
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assert |macro |;
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assert |{ foo = hello world}|;
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assert |{ foo = "hello world"|;
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assert |{ = }|;
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assert |let foo |;
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assert |let |;
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assert |import |;
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assert |import foo |;
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assert |out |;
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assert |out "|;
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assert |out json|;
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assert |"|;
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assert |=|;
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@ -1,2 +0,0 @@
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assert |macro |;
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assert |{ foo = hello world}|;
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109
src/parse/mod.rs
109
src/parse/mod.rs
@ -34,6 +34,26 @@ const ENABLE_TRACE: bool = true;
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const ENABLE_TRACE: bool = false;
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type ParseResult<O> = Result<O, error::Error>;
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macro_rules! wrap_err {
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($i:expr, $submac:ident, $msg:expr) => {
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wrap_err!($i, call!($submac), $msg)
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};
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($i:expr, $submac:ident!( $($args:tt)* ), $msg:expr) => {{
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let _i = $i.clone();
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match $submac!(_i, $($args)*) {
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IResult::Done(rest, mac) => IResult::Done(rest, mac),
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IResult::Incomplete(i) => IResult::Incomplete(i),
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IResult::Error(nom::ErrorKind::Custom(cause)) => {
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let wrapper = error::Error::new_with_cause($msg, error::ErrorType::ParseError, cause);
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IResult::Error(nom::ErrorKind::Custom(wrapper))
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}
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IResult::Error(e) => IResult::Error(e),
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}
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}};
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}
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macro_rules! trace_nom {
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($i:expr, $rule:ident!( $($args:tt)* )) => {
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{
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@ -143,7 +163,7 @@ macro_rules! alt_peek {
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);
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(__inner $i:expr, $peekrule:ident => $($rest:tt)* ) => (
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alt_peek!(__inner $i, call!($peek) => $($rest)* )
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alt_peek!(__inner $i, call!($peekrule) => $($rest)* )
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);
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(__inner $i:expr, $peekrule:ident!( $($peekargs:tt)* ) => $parserule:ident!( $($parseargs:tt)* ) | $($rest:tt)* ) => (
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@ -273,7 +293,8 @@ named!(boolean_value<TokenIter, Value, error::Error>,
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named!(
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field_value<TokenIter, (Token, Expression), error::Error>,
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do_parse!(
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field: alt!(match_type!(BAREWORD) | match_type!(STR)) >>
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field: wrap_err!(alt!(match_type!(BAREWORD) | match_type!(STR)),
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"Field names must be a bareword or a string.") >>
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punct!("=") >>
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value: expression >>
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(field, value)
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@ -343,20 +364,14 @@ named!(compound_value<TokenIter, Value, error::Error>,
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)
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);
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named!(scalar_value<TokenIter, Value, error::Error>,
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alt!(
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trace_nom!(boolean_value) |
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trace_nom!(empty_value) |
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trace_nom!(number) |
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trace_nom!(quoted_value)
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)
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);
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named!(value<TokenIter, Value, error::Error>,
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alt!(
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trace_nom!(selector_value)
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| trace_nom!(compound_value)
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| trace_nom!(scalar_value)
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alt_peek!(
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symbol_or_expression => trace_nom!(selector_value)
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| alt!(punct!("[") | punct!("{")) => trace_nom!(compound_value)
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| match_type!(BOOLEAN) => trace_nom!(boolean_value)
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| match_type!(EMPTY) => trace_nom!(empty_value)
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| alt!(match_type!(DIGIT) | punct!(".")) => trace_nom!(number)
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| trace_nom!(quoted_value)
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)
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);
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@ -723,20 +738,40 @@ named!(list_op_expression<TokenIter, Expression, error::Error>,
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)
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);
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fn unprefixed_expression(input: TokenIter) -> NomResult<Expression> {
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let _input = input.clone();
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let attempt = alt!(input,
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trace_nom!(call_expression) |
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trace_nom!(copy_expression) |
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trace_nom!(format_expression));
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match attempt {
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IResult::Incomplete(i) => IResult::Incomplete(i),
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IResult::Done(rest, expr) => IResult::Done(rest, expr),
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IResult::Error(_) => trace_nom!(_input, simple_expression),
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}
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}
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named!(non_op_expression<TokenIter, Expression, error::Error>,
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alt!(trace_nom!(list_op_expression) |
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trace_nom!(macro_expression) |
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trace_nom!(format_expression) |
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trace_nom!(select_expression) |
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trace_nom!(grouped_expression) |
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trace_nom!(call_expression) |
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trace_nom!(copy_expression) |
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trace_nom!(simple_expression))
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alt_peek!(
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alt!(word!("map") | word!("filter")) => trace_nom!(list_op_expression) |
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word!("macro") => trace_nom!(macro_expression) |
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word!("select") => trace_nom!(select_expression) |
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punct!("(") => trace_nom!(grouped_expression) |
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trace_nom!(unprefixed_expression))
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);
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named!(expression<TokenIter, Expression, error::Error>,
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alt_complete!(trace_nom!(op_expression) | trace_nom!(non_op_expression))
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);
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fn expression(input: TokenIter) -> NomResult<Expression> {
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let _input = input.clone();
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match trace_nom!(_input, op_expression) {
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IResult::Incomplete(i) => IResult::Incomplete(i),
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IResult::Error(_) => trace_nom!(input, non_op_expression),
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IResult::Done(rest, expr) => IResult::Done(rest, expr),
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}
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}
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//named!(expression<TokenIter, Expression, error::Error>,
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// alt_complete!(trace_nom!(op_expression) | trace_nom!(non_op_expression))
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//);
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fn expression_to_statement(v: Expression) -> ParseResult<Statement> {
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Ok(Statement::Expression(v))
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@ -769,12 +804,12 @@ named!(let_stmt_body<TokenIter, Statement, error::Error>,
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);
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named!(let_statement<TokenIter, Statement, error::Error>,
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do_parse!(
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wrap_err!(do_parse!(
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word!("let") >>
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pos: pos >>
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stmt: trace_nom!(let_stmt_body) >>
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(stmt)
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)
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), "Invalid let statement")
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);
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fn tuple_to_import(t: (Token, Token)) -> ParseResult<Statement> {
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@ -797,34 +832,34 @@ named!(import_stmt_body<TokenIter, Statement, error::Error>,
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);
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named!(import_statement<TokenIter, Statement, error::Error>,
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do_parse!(
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wrap_err!(do_parse!(
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word!("import") >>
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// past this point we know this is supposed to be an import statement.
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pos: pos >>
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stmt: trace_nom!(import_stmt_body) >>
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(stmt)
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)
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), "Invalid import statement")
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);
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named!(assert_statement<TokenIter, Statement, error::Error>,
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do_parse!(
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wrap_err!(do_parse!(
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word!("assert") >>
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pos: pos >>
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tok: match_type!(PIPEQUOTE) >>
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punct!(";") >>
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(Statement::Assert(tok.clone()))
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)
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), "Invalid assert statement")
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);
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named!(out_statement<TokenIter, Statement, error::Error>,
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do_parse!(
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wrap_err!(do_parse!(
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word!("out") >>
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pos: pos >>
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typ: match_type!(BAREWORD) >>
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expr: expression >>
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punct!(";") >>
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(Statement::Output(typ.clone(), expr.clone()))
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)
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), "Invalid out statement")
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);
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//trace_macros!(true);
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@ -889,10 +924,10 @@ pub fn parse(input: LocatedSpan<&str>) -> Result<Vec<Statement>, error::Error> {
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return Ok(out);
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}
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Err(e) => {
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return Err(error::Error::new(
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format!("Tokenization Error {:?}", e.1),
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return Err(error::Error::new_with_cause(
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format!("Tokenization Error"),
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error::ErrorType::ParseError,
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e.0,
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e,
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));
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}
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}
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@ -392,7 +392,7 @@ named!(token( Span ) -> Token,
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);
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/// Consumes an input Span and returns either a Vec<Token> or a nom::ErrorKind.
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pub fn tokenize(input: Span) -> Result<Vec<Token>, (Position, nom::ErrorKind)> {
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pub fn tokenize(input: Span) -> Result<Vec<Token>, error::Error> {
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let mut out = Vec::new();
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let mut i = input;
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loop {
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@ -400,22 +400,24 @@ pub fn tokenize(input: Span) -> Result<Vec<Token>, (Position, nom::ErrorKind)> {
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break;
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}
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match token(i) {
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nom::IResult::Error(e) => {
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return Err((
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nom::IResult::Error(_e) => {
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return Err(error::Error::new(
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"Invalid Token encountered",
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error::ErrorType::UnexpectedToken,
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Position {
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line: i.line as usize,
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column: i.get_column() as usize,
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},
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e,
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));
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}
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nom::IResult::Incomplete(_) => {
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return Err((
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return Err(error::Error::new(
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"Unexepcted end of Input",
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error::ErrorType::UnexpectedToken,
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Position {
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line: i.line as usize,
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column: i.get_column() as usize,
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},
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nom::ErrorKind::Complete,
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));
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}
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nom::IResult::Done(rest, tok) => {
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