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use crate::parser::command::argument::brigadier::{self, parse_number, ParseNumberError};
const INCOMPLETE_2: &str = "Incomplete (expected 2 coordinates)";
const INCOMPLETE_3: &str = "Incomplete (expected 3 coordinates)";
const CANNOT_MIX: &str =
"Cannot mix world & local coordinates (everyhing must either use ^ or not)";
#[derive(Clone, Debug, PartialEq)]
pub struct MinecraftBlockPos(pub MinecraftVec3);
impl MinecraftBlockPos {
pub fn parse(string: &str) -> Result<(Self, usize), String> {
if string.starts_with('^') {
let (argument, len) = LocalCoordinates::parse(string)?;
Ok((MinecraftBlockPos(MinecraftVec3::Local(argument)), len))
} else {
let (argument, len) = WorldCoordinates::parse_int(string)?;
Ok((MinecraftBlockPos(MinecraftVec3::World(argument)), len))
}
}
}
#[derive(Clone, Debug, PartialEq)]
pub struct MinecraftRotation {
x_relative: bool,
x: f64,
y_relative: bool,
y: f64,
}
impl MinecraftRotation {
pub fn parse(string: &str) -> Result<(Self, usize), String> {
let suffix = string;
check_non_local(suffix)?;
let (x_relative, len) = parse_relative(suffix);
let suffix = &suffix[len..];
let (x, len) = parse_number_or_default(suffix)?;
let suffix = &suffix[len..];
let suffix = suffix.strip_prefix(' ').ok_or(INCOMPLETE_2.to_string())?;
check_non_local(suffix)?;
let (y_relative, len) = parse_relative(suffix);
let suffix = &suffix[len..];
let (y, len) = parse_number_or_default(suffix)?;
let suffix = &suffix[len..];
let rotation = MinecraftRotation {
x_relative,
x,
y_relative,
y,
};
let len = string.len() - suffix.len();
Ok((rotation, len))
}
}
#[derive(Clone, Debug, PartialEq)]
pub enum MinecraftVec3 {
Local(LocalCoordinates),
World(WorldCoordinates),
}
impl MinecraftVec3 {
pub fn parse(string: &str) -> Result<(Self, usize), String> {
if string.starts_with('^') {
let (argument, len) = LocalCoordinates::parse(string)?;
Ok((MinecraftVec3::Local(argument), len))
} else {
let (argument, len) = WorldCoordinates::parse_double(string)?;
Ok((MinecraftVec3::World(argument), len))
}
}
}
#[derive(Clone, Debug, PartialEq)]
pub struct WorldCoordinates {
x_relative: bool,
x: f64,
y_relative: bool,
y: f64,
z_relative: bool,
z: f64,
}
impl WorldCoordinates {
fn parse_double(string: &str) -> Result<(Self, usize), String> {
WorldCoordinates::parse::<f64>(string)
}
fn parse_int(string: &str) -> Result<(Self, usize), String> {
WorldCoordinates::parse::<i32>(string)
}
fn parse<N: Number>(string: &str) -> Result<(Self, usize), String> {
let suffix = string;
let (x_relative, len) = parse_relative(suffix);
let suffix = &suffix[len..];
let (x, len) = WorldCoordinates::parse_coordinate::<N>(suffix, x_relative)?;
let suffix = &suffix[len..];
let suffix = suffix.strip_prefix(' ').ok_or(INCOMPLETE_3.to_string())?;
check_non_local(suffix)?;
let (y_relative, len) = parse_relative(suffix);
let suffix = &suffix[len..];
let (y, len) = WorldCoordinates::parse_coordinate::<N>(suffix, y_relative)?;
let suffix = &suffix[len..];
let suffix = suffix.strip_prefix(' ').ok_or(INCOMPLETE_3.to_string())?;
check_non_local(suffix)?;
let (z_relative, len) = parse_relative(suffix);
let suffix = &suffix[len..];
let (z, len) = WorldCoordinates::parse_coordinate::<N>(suffix, z_relative)?;
let suffix = &suffix[len..];
let coordinates = WorldCoordinates {
x_relative,
x,
y_relative,
y,
z_relative,
z,
};
let len = string.len() - suffix.len();
Ok((coordinates, len))
}
fn parse_coordinate<N: Number>(string: &str, relative: bool) -> Result<(f64, usize), String> {
if relative {
parse_number_or_default(string)
} else {
let (number, len) = parse_number_or_default::<N>(string)?;
Ok((number.into(), len))
}
}
}
#[derive(Clone, Debug, PartialEq)]
pub struct LocalCoordinates {
x: f64,
y: f64,
z: f64,
}
impl LocalCoordinates {
fn parse(string: &str) -> Result<(Self, usize), String> {
let suffix = string.strip_prefix('^').ok_or(CANNOT_MIX.to_string())?;
let (x, len) = parse_number_or_default(suffix)?;
let suffix = &suffix[len..];
let suffix = suffix.strip_prefix(' ').ok_or(INCOMPLETE_3.to_string())?;
let suffix = suffix.strip_prefix('^').ok_or(CANNOT_MIX.to_string())?;
let (y, len) = parse_number_or_default(suffix)?;
let suffix = &suffix[len..];
let suffix = suffix.strip_prefix(' ').ok_or(INCOMPLETE_3.to_string())?;
let suffix = suffix.strip_prefix('^').ok_or(CANNOT_MIX.to_string())?;
let (z, len) = parse_number_or_default(suffix)?;
let suffix = &suffix[len..];
let coordinates = LocalCoordinates { x, y, z };
let len = string.len() - suffix.len();
Ok((coordinates, len))
}
}
fn check_non_local(string: &str) -> Result<(), String> {
if string.starts_with('^') {
Err(CANNOT_MIX.to_string())
} else {
Ok(())
}
}
fn parse_relative(string: &str) -> (bool, usize) {
if string.starts_with('~') {
(true, '~'.len_utf8())
} else {
(false, 0)
}
}
trait Number: brigadier::Number + Default + Into<f64> {}
impl Number for i32 {}
impl Number for f64 {}
fn parse_number_or_default<N: Number>(string: &str) -> Result<(N, usize), String> {
match parse_number(string) {
Ok(number) => Ok(number),
Err(ParseNumberError::Empty(..)) => Ok((N::default(), 0)),
Err(e) => Err(e.to_string()),
}
}