104 lines
3.6 KiB
Rust
104 lines
3.6 KiB
Rust
/// Represents the type of minification error.
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#[derive(Debug, Eq, PartialEq)]
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pub enum ErrorType {
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ClosingTagMismatch { expected: String, got: String },
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NotFound(&'static str),
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UnexpectedEnd,
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UnexpectedClosingTag,
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}
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impl ErrorType {
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/// Generates an English message describing the error with any additional context.
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pub fn message(self) -> String {
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match self {
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ErrorType::ClosingTagMismatch { expected, got } => {
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format!("Closing tag name does not match opening tag (expected \"{}\", got \"{}\").", expected, got)
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}
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ErrorType::NotFound(exp) => {
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format!("Expected {}.", exp)
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}
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ErrorType::UnexpectedEnd => {
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format!("Unexpected end of source code.")
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}
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ErrorType::UnexpectedClosingTag => {
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format!("Unexpected closing tag.")
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}
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}
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}
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}
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/// Details about a minification failure, including where it occurred and why.
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#[derive(Debug)]
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pub struct Error {
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pub error_type: ErrorType,
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pub position: usize,
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}
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/// User-friendly details about a minification failure, including an English message description of
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/// the reason, and generated printable contextual representation of the code where the error
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/// occurred.
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#[derive(Debug)]
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pub struct FriendlyError {
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pub position: usize,
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pub message: String,
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pub code_context: String,
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}
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pub type ProcessingResult<T> = Result<T, ErrorType>;
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#[inline(always)]
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fn maybe_mark_indicator(line: &mut Vec<u8>, marker: u8, maybe_pos: isize, lower: usize, upper: usize) -> bool {
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let pos = maybe_pos as usize;
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if maybe_pos > -1 && pos >= lower && pos < upper {
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let pos_in_line = pos - lower;
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while line.len() <= pos_in_line {
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line.push(b' ');
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};
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line.insert(pos_in_line, if line[pos_in_line] != b' ' { b'B' } else { marker });
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true
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} else {
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false
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}
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}
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// Pass -1 for read_pos or write_pos to prevent them from being represented.
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pub fn debug_repr(code: &[u8], read_pos: isize, write_pos: isize) -> String {
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let only_one_pos = read_pos == -1 || write_pos == -1;
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let read_marker = if only_one_pos { b'^' } else { b'R' };
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let write_marker = if only_one_pos { b'^' } else { b'W' };
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let mut lines = Vec::<(isize, String)>::new();
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let mut cur_pos = 0;
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for (line_no, line) in code.split(|c| *c == b'\n').enumerate() {
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// Include '\n'. Note that the last line might not have '\n' but that's OK for these calculations.
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let len = line.len() + 1;
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let line_as_string = unsafe { String::from_utf8_unchecked(line.to_vec()) };
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lines.push(((line_no + 1) as isize, line_as_string));
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let new_pos = cur_pos + len;
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// Rust does lazy allocation by default, so this is not wasteful.
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let mut indicator_line = Vec::new();
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maybe_mark_indicator(&mut indicator_line, write_marker, write_pos, cur_pos, new_pos);
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let marked_read = maybe_mark_indicator(&mut indicator_line, read_marker, read_pos, cur_pos, new_pos);
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if !indicator_line.is_empty() {
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lines.push((-1, unsafe { String::from_utf8_unchecked(indicator_line) }));
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};
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cur_pos = new_pos;
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if marked_read {
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break;
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};
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};
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let line_no_col_width = lines.len().to_string().len();
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let mut res = String::new();
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for (line_no, line) in lines {
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res.push_str(&format!(
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"{:>indent$}|{}\n",
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if line_no == -1 { ">".repeat(line_no_col_width) } else { line_no.to_string() },
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line,
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indent = line_no_col_width,
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));
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};
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res
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}
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