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use std::path::PathBuf;
#[derive(Clone)]
pub struct SourceSpan {
/// The source characters which this span represents.
pub string: String,
/// The location of this span in the merged source file.
pub in_merged: SourceLocation,
/// The location of this span in the original source file.
pub in_source: Option<SourceLocation>,
/// Drill down to a more accurate location.
pub child: Option<Box<SourceSpan>>,
}
impl SourceSpan {
pub fn location(&self) -> &SourceLocation {
self.in_source.as_ref().unwrap_or(&self.in_merged)
}
/// Wrap this source span around a child source span.
pub fn wrap(mut self, source: SourceSpan) -> Self {
self.child = Some(Box::new(source)); self
}
}
#[derive(Clone)]
pub struct SourceLocation {
/// File path the source was loaded from.
pub path: Option<PathBuf>,
/// Position of the first character of the string.
pub start: SourcePosition,
/// Position of the final character of the string.
pub end: SourcePosition,
}
impl std::fmt::Display for SourceLocation {
fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
let y = self.start.line + 1;
let x = self.start.column + 1;
match &self.path {
Some(path) => write!(f, "{}:{y}:{x}", path.as_os_str().to_string_lossy()),
None => write!(f, "<unknown>:{y}:{x}"),
}
}
}
#[derive(Clone, Copy)]
pub struct SourcePosition {
/// The number of lines that precede this line in the source file.
pub line: usize,
/// The number of characters that precede this character in the line.
pub column: usize,
}
impl SourcePosition {
pub const ZERO: Self = Self { line: 0, column: 0 };
// Advance to the next character in the row.
pub fn to_next_char(&mut self) {
self.column += 1;
}
// Advance to the start of the next line.
pub fn to_next_line(&mut self) {
self.line += 1;
self.column = 0;
}
// Advance to the next character, wrapping on line breaks.
pub fn advance(&mut self, c: char) {
match c {
'\n' => self.to_next_line(),
_ => self.to_next_char(),
}
}
}
impl std::fmt::Display for SourcePosition {
fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
let y = self.line + 1;
let x = self.column + 1;
write!(f, "{y}:{x}")
}
}
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