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error messages for bad operators

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Folkert 2021-03-07 18:50:44 +01:00
parent 6b2119a54d
commit 1b750149c0
3 changed files with 346 additions and 188 deletions
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76
compiler/reporting/src/error/parse.rs
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@ -221,6 +221,82 @@ fn to_expr_report<'a>(
}
}
EExpr::BadOperator(op, row, col) => {
let surroundings = Region::from_rows_cols(start_row, start_col, *row, *col);
let region = Region::from_rows_cols(*row, *col, *row, *col + op.len() as u16);
let suggestion = match *op {
b"|" => vec![
alloc.reflow("Maybe you want "),
alloc.parser_suggestion("||"),
alloc.reflow(" or "),
alloc.parser_suggestion("|>"),
alloc.reflow(" instead?"),
],
b"++" => vec![
alloc.reflow("To concatenate two lists or strings, try using "),
alloc.parser_suggestion("List.concat"),
alloc.reflow(" or "),
alloc.parser_suggestion("Str.concat"),
alloc.reflow(" instead."),
],
b":" => vec![alloc.stack(vec![
alloc.concat(vec![
alloc.reflow("The has-type operator "),
alloc.parser_suggestion(":"),
alloc.reflow(" can only occur in a definition's type signature, like "),
]),
alloc
.vcat(vec![
alloc.text("increment : I64 -> I64"),
alloc.text("increment = \\x -> x + 1"),
])
.indent(4),
])],
b"->" => vec![alloc.stack(vec![
alloc.concat(vec![
alloc.reflow("The arrow "),
alloc.parser_suggestion("->"),
alloc.reflow(" is only used to define cases in a "),
alloc.keyword("when"),
alloc.reflow("."),
]),
alloc
.vcat(vec![
alloc.text("when color is"),
alloc.text("Red -> \"stop!\"").indent(4),
alloc.text("Green -> \"go!\"").indent(4),
])
.indent(4),
])],
b"!" => vec![
alloc.reflow("The boolean negation operator "),
alloc.parser_suggestion("!"),
alloc.reflow(" must occur immediately before an expression, like "),
alloc.parser_suggestion("!(List.isEmpty primes)"),
alloc.reflow(". There cannot be a space between the "),
alloc.parser_suggestion("!"),
alloc.reflow(" and the expression after it."),
],
_ => vec![
alloc.reflow("I have no specific suggestion for this operator, "),
alloc.reflow("see TODO for the full list of operators in Roc."),
],
};
let doc = alloc.stack(vec![
alloc.reflow(r"This looks like an operator, but it's not one I recognize!"),
alloc.region_with_subregion(surroundings, region),
alloc.concat(suggestion),
]);
Report {
filename,
doc,
title: "UNKNOWN OPERATOR".to_string(),
}
}
EExpr::Ident(_row, _col) => unreachable!("another branch would be taken"),
EExpr::QualifiedTag(row, col) => {