1 files changed, 83 insertions, 0 deletions
diff --git a/audio/src/parse/pos.rs b/audio/src/parse/pos.rs
new file mode 100644
index 0000000..f56a96b
--- /dev/null
+++ b/audio/src/parse/pos.rs
@@ -0,0 +1,83 @@
+use std::fmt;
+
+#[derive(Clone, Copy, Default, Debug, PartialEq, Eq)]
+pub struct Pos {
+	pub idx: u32,
+	pub line: u32,
+	pub col: u32,
+}
+
+impl std::cmp::PartialOrd for Pos {
+	fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
+		Some(self.cmp(other))
+	}
+}
+
+impl std::cmp::Ord for Pos {
+	fn cmp(&self, other: &Self) -> std::cmp::Ordering {
+		self.idx.cmp(&other.idx)
+	}
+}
+
+impl Pos {
+	pub const fn new() -> Self {
+		Self {
+			idx: 0,
+			line: 1,
+			col: 1,
+		}
+	}
+
+	#[must_use]
+	pub fn advance(self, c: char) -> Self {
+		let idx = self.idx + u32::try_from(c.len_utf8()).unwrap_or_default();
+		if c == '\n' {
+			Self {
+				idx,
+				line: self.line + 1,
+				col: 1,
+			}
+		} else {
+			Self {
+				idx,
+				line: self.line,
+				col: self.col + 1,
+			}
+		}
+	}
+}
+
+impl fmt::Display for Pos {
+	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+		write!(f, "{}:{}", self.line, self.col)
+	}
+}
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub struct Span {
+	pub start: Pos,
+	pub end: Pos,
+}
+
+impl Span {
+	pub const fn new(start: Pos, end: Pos) -> Self {
+		if end.idx < start.idx {
+			Self {
+				start: end,
+				end: start,
+			}
+		} else {
+			Self { start, end }
+		}
+	}
+
+	pub fn of<'a>(&self, s: &'a str) -> &'a str {
+		&s[(self.start.idx as usize)..(self.end.idx as usize)]
+	}
+}
+
+impl fmt::Display for Span {
+	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+		write!(f, "{}-{}", self.start, self.end)
+	}
+}