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// Copyright (c) 2026 Hemashushu <hippospark@gmail.com>, All rights reserved.
//
// This Source Code Form is subject to the terms of
// the Mozilla Public License version 2.0 and additional exceptions.
// For more details, see the LICENSE, LICENSE.additional, and CONTRIBUTING files.
use crate::position::Position;
#[derive(Debug, PartialEq, Clone, Copy, Default)]
pub struct Range {
pub start: Position,
pub end_inclusive: Position,
}
impl Range {
pub fn new(start: &Position, end_inclusive: &Position) -> Self {
Self {
start: *start,
end_inclusive: *end_inclusive,
}
}
/// Creates a Range that represents a single position (i.e., start and end are the same).
pub fn from_single_position(pos: &Position) -> Self {
Self {
start: *pos,
end_inclusive: *pos,
}
}
/// Creates a Range from a starting position and a length,
/// where the end position is calculated based on the length and
/// assumes that the range is on the same line (i.e., only the column is incremented).
pub fn from_position_and_length(pos: &Position, length: usize) -> Self {
let inc = length - 1;
Self {
start: *pos,
end_inclusive: Position::new(pos.index + inc, pos.line, pos.column + inc),
}
}
/// Creates a Range from detailed parameters, including the
/// starting index, line, column, and length.
/// The end position is calculated based on the starting position and length,
/// assuming that the range is on the same line.
pub fn from_detail(index: usize, line: usize, column: usize, length: usize) -> Self {
let inc = length - 1;
let start = Position::new(index, line, column);
let end_inclusive = Position::new(index + inc, line, column + inc);
Self {
start,
end_inclusive,
}
}
/// Merges two Ranges into a single Range that spans from the start of the left Range
/// to the end of the right Range. This is useful for combining adjacent or overlapping ranges
pub fn merge(left: &Self, right: &Self) -> Self {
Self {
start: left.start,
end_inclusive: right.end_inclusive,
}
}
}