80 lines
1.7 KiB
Rust
80 lines
1.7 KiB
Rust
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//! Datatypes to support source location information.
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use std::fmt;
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/// A location somewhere in the sourcecode.
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#[derive(Clone, Copy, Debug, Default, PartialEq)]
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pub struct Location {
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row: usize,
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column: usize,
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}
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impl fmt::Display for Location {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "line {} column {}", self.row, self.column)
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}
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}
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impl Location {
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pub fn visualize<'a>(
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&self,
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line: &'a str,
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desc: impl fmt::Display + 'a,
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) -> impl fmt::Display + 'a {
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struct Visualize<'a, D: fmt::Display> {
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loc: Location,
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line: &'a str,
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desc: D,
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}
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impl<D: fmt::Display> fmt::Display for Visualize<'_, D> {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(
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f,
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"{}\n{}\n{arrow:>pad$}",
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self.desc,
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self.line,
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pad = self.loc.column,
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arrow = "↑",
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)
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}
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}
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Visualize {
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loc: *self,
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line,
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desc,
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}
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}
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}
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impl Location {
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pub fn new(row: usize, column: usize) -> Self {
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Location { row, column }
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}
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pub fn row(&self) -> usize {
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self.row
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}
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pub fn column(&self) -> usize {
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self.column
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}
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pub fn reset(&mut self) {
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self.row = 1;
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self.column = 1;
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}
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pub fn go_right(&mut self) {
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self.column += 1;
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}
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pub fn go_left(&mut self) {
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self.column -= 1;
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}
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pub fn newline(&mut self) {
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self.row += 1;
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self.column = 1;
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}
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}
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