Function try_parse_def

src/expr-parser/src/parser.rs:53–67

Builds a source definition from a string.

(catalog: &TestCatalog, s: &str)

/// Builds a source definition from a string.
pub fn try_parse_def(catalog: &TestCatalog, s: &str) -> Result<Def, String> {
    // Define a Parser that constructs a (read-only) parsing context `ctx` and
    // delegates to `relation::parse_expr` by passing a `ctx` as a shared ref.
    let parser = move |input: ParseStream| {
        let ctx = Ctx { catalog };
        def::parse_def(&ctx, input)
    };
    // Call the parser with the given input string.
    let def = parser.parse_str(s).map_err(|err| {
        let (line, column) = (err.span().start().line, err.span().start().column);
        format!("parse error at {line}:{column}:\n{err}\n")
    })?;
    // Return the parsed, post-processed expression.
    Ok(def)
}

/// Support for parsing [mz_expr::MirRelationExpr].
mod relation {