Parses a propline from `line`. Returns an error if `line` looks like a propline but its contents are invalid.
(line: &str)
| 41 | /// |
| 42 | /// Returns an error if `line` looks like a propline but its contents are invalid. |
| 43 | fn parse_propline(line: &str) -> io::Result<PropLine> { |
| 44 | let without_comment = match line.strip_prefix("' ") { |
| 45 | Some(line) => Some(line), |
| 46 | None => { |
| 47 | if line.len() <= 4 { |
| 48 | None |
| 49 | } else { |
| 50 | let token = line[0..4].to_ascii_lowercase(); |
| 51 | if token == "rem " { Some(&line[4..]) } else { None } |
| 52 | } |
| 53 | } |
| 54 | }; |
| 55 | let Some(payload) = without_comment else { |
| 56 | return Ok(PropLine::default()); |
| 57 | }; |
| 58 | |
| 59 | let Some(payload) = payload.strip_prefix("endbasic cli: ") else { |
| 60 | return Ok(PropLine::default()); |
| 61 | }; |
| 62 | |
| 63 | let Some(console_spec) = payload.strip_prefix("console=") else { |
| 64 | return Err(io::Error::new( |
| 65 | io::ErrorKind::InvalidInput, |
| 66 | format!("Invalid EndBASIC propline: {}", line), |
| 67 | )); |
| 68 | }; |
| 69 | |
| 70 | if console_spec.is_empty() { |
| 71 | return Err(io::Error::new( |
| 72 | io::ErrorKind::InvalidInput, |
| 73 | "Invalid EndBASIC propline: missing console specification", |
| 74 | )); |
| 75 | } |
| 76 | |
| 77 | Ok(PropLine { console_spec: Some(console_spec.to_owned()) }) |
| 78 | } |
| 79 | |
| 80 | /// Extracts the property line from `path` if present. |
| 81 | pub fn extract_propline<P: AsRef<Path>>(path: P) -> io::Result<PropLine> { |
no test coverage detected