80 lines
2.2 KiB
Rust
80 lines
2.2 KiB
Rust
use crate::common::*;
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#[derive(Debug, PartialEq, Clone, Copy)]
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pub(crate) struct Token<'src> {
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pub(crate) offset: usize,
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pub(crate) length: usize,
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pub(crate) line: usize,
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pub(crate) column: usize,
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pub(crate) src: &'src str,
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pub(crate) kind: TokenKind,
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}
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impl<'src> Token<'src> {
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pub(crate) fn lexeme(&self) -> &'src str {
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&self.src[self.offset..self.offset + self.length]
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}
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pub(crate) fn error(&self, kind: CompilationErrorKind<'src>) -> CompilationError<'src> {
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CompilationError { token: *self, kind }
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}
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pub(crate) fn write_context(&self, f: &mut Formatter, color: Color) -> fmt::Result {
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let width = if self.length == 0 { 1 } else { self.length };
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let line_number = self.line.ordinal();
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match self.src.lines().nth(self.line) {
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Some(line) => {
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let mut i = 0;
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let mut space_column = 0;
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let mut space_line = String::new();
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let mut space_width = 0;
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for c in line.chars() {
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if c == '\t' {
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space_line.push_str(" ");
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if i < self.column {
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space_column += 4;
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}
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if i >= self.column && i < self.column + width {
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space_width += 4;
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}
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} else {
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if i < self.column {
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space_column += UnicodeWidthChar::width(c).unwrap_or(0);
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}
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if i >= self.column && i < self.column + width {
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space_width += UnicodeWidthChar::width(c).unwrap_or(0);
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}
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space_line.push(c);
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}
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i += c.len_utf8();
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}
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let line_number_width = line_number.to_string().len();
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writeln!(f, "{0:1$} |", "", line_number_width)?;
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writeln!(f, "{} | {}", line_number, space_line)?;
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write!(f, "{0:1$} |", "", line_number_width)?;
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write!(
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f,
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" {0:1$}{2}{3:^<4$}{5}",
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"",
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space_column,
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color.prefix(),
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"",
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space_width,
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color.suffix()
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)?;
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}
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None => {
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if self.offset != self.src.len() {
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write!(
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f,
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"internal error: Error has invalid line number: {}",
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line_number
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)?
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}
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}
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}
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Ok(())
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}
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}
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