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61 lines
1.8 KiB
61 lines
1.8 KiB
use sexp::{Atom, Sexp};
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use crate::asm::error::CrsnError;
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pub fn expect_list(expr: Option<Sexp>, allow_empty: bool) -> Result<Vec<Sexp>, CrsnError> {
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if let Some(expr) = expr {
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match &expr {
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Sexp::Atom(_) => {
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return Err(CrsnError::ParseIn("Expected a list".into(), expr));
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}
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Sexp::List(list) => {
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if !allow_empty && list.is_empty() {
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return Err(CrsnError::ParseIn("Routine: Empty list".into(), expr));
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}
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if let Sexp::List(list) = expr {
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return Ok(list);
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} else {
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unreachable!();
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}
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}
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}
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}
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Err(CrsnError::Parse("Expected a list, got nothing".into()))
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}
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pub fn expect_atom(expr: Option<Sexp>) -> Result<Atom, CrsnError> {
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if let Some(expr) = expr {
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match &expr {
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Sexp::Atom(_atom) => {
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if let Sexp::Atom(a) = expr {
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return Ok(a);
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} else {
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unreachable!();
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}
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}
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Sexp::List(_) => {
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return Err(CrsnError::ParseIn("Expected atom got list".into(), expr));
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}
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}
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}
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Err(CrsnError::Parse("Expected atom, got nothing".into()))
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}
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pub fn expect_string_atom(expr: Option<Sexp>) -> Result<String, CrsnError> {
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match expect_atom(expr) {
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Ok(Atom::S(s)) => Ok(s),
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Ok(atom) => Err(CrsnError::ParseIn("Expected string atom".into(), Sexp::Atom(atom))),
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Err(e) => Err(e),
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}
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}
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// pub fn expect_int_atom(expr: Option<Sexp>) -> Result<i64, Error> {
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// match expect_atom(expr) {
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// Ok(Atom::I(v)) => Ok(v),
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// Ok(atom) => Err(Error::ParseIn("Expected int atom".into(), Sexp::Atom(atom))),
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// Err(e) => Err(e),
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// }
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// }
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