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use crate::BooleanError;
use crate::path::{Path, path_from_commands, path_to_commands};
use crate::path_command::{AbsolutePathCommand, PathCommand, RelativePathCommand};
use glam::DVec2;
use regex::Regex;
pub fn commands_from_path_data(d: &str) -> Result<Vec<PathCommand>, BooleanError> {
let re_float = Regex::new(r"^\s*,?\s*(-?\d*(?:\d\.|\.\d|\d)\d*(?:[eE][+\-]?\d+)?)").unwrap();
let re_cmd = Regex::new(r"^\s*([MLCSQTAZHVmlhvcsqtaz])").unwrap();
let re_bool = Regex::new(r"^\s*,?\s*([01])").unwrap();
let mut i = 0;
let mut last_cmd = 'M';
let mut commands = Vec::new();
let get_cmd = |i: &mut usize, last_cmd: char| -> Option<char> {
if *i >= d.len() - 1.min(d.len()) {
return None;
}
if let Some(cap) = re_cmd.captures(&d[*i..]) {
*i += cap[0].len();
Some(cap[1].chars().next().unwrap())
} else {
match last_cmd {
'M' => Some('L'),
'm' => Some('l'),
'z' | 'Z' => None,
_ => Some(last_cmd),
}
}
};
let get_float = |i: &mut usize| -> f64 {
if let Some(cap) = re_float.captures(&d[*i..]) {
*i += cap[0].len();
cap[1].parse().unwrap()
} else {
panic!("Invalid path data. Expected a number at index {}, got {}", i, &d[*i..]);
}
};
let get_bool = |i: &mut usize| -> bool {
if let Some(cap) = re_bool.captures(&d[*i..]) {
*i += cap[0].len();
&cap[1] == "1"
} else {
panic!("Invalid path data. Expected a flag at index {}", i);
}
};
while let Some(cmd) = get_cmd(&mut i, last_cmd) {
last_cmd = cmd;
match cmd {
'M' => commands.push(PathCommand::Absolute(AbsolutePathCommand::M(DVec2::new(get_float(&mut i), get_float(&mut i))))),
'L' => commands.push(PathCommand::Absolute(AbsolutePathCommand::L(DVec2::new(get_float(&mut i), get_float(&mut i))))),
'C' => commands.push(PathCommand::Absolute(AbsolutePathCommand::C(
DVec2::new(get_float(&mut i), get_float(&mut i)),
DVec2::new(get_float(&mut i), get_float(&mut i)),
DVec2::new(get_float(&mut i), get_float(&mut i)),
))),
'S' => commands.push(PathCommand::Absolute(AbsolutePathCommand::S(
DVec2::new(get_float(&mut i), get_float(&mut i)),
DVec2::new(get_float(&mut i), get_float(&mut i)),
))),
'Q' => commands.push(PathCommand::Absolute(AbsolutePathCommand::Q(
DVec2::new(get_float(&mut i), get_float(&mut i)),
DVec2::new(get_float(&mut i), get_float(&mut i)),
))),
'T' => commands.push(PathCommand::Absolute(AbsolutePathCommand::T(DVec2::new(get_float(&mut i), get_float(&mut i))))),
'A' => commands.push(PathCommand::Absolute(AbsolutePathCommand::A(
get_float(&mut i),
get_float(&mut i),
get_float(&mut i),
get_bool(&mut i),
get_bool(&mut i),
DVec2::new(get_float(&mut i), get_float(&mut i)),
))),
'Z' | 'z' => commands.push(PathCommand::Absolute(AbsolutePathCommand::Z)),
'H' => commands.push(PathCommand::Absolute(AbsolutePathCommand::H(get_float(&mut i)))),
'V' => commands.push(PathCommand::Absolute(AbsolutePathCommand::V(get_float(&mut i)))),
'm' => commands.push(PathCommand::Relative(RelativePathCommand::M(get_float(&mut i), get_float(&mut i)))),
'l' => commands.push(PathCommand::Relative(RelativePathCommand::L(get_float(&mut i), get_float(&mut i)))),
'h' => commands.push(PathCommand::Relative(RelativePathCommand::H(get_float(&mut i)))),
'v' => commands.push(PathCommand::Relative(RelativePathCommand::V(get_float(&mut i)))),
'c' => commands.push(PathCommand::Relative(RelativePathCommand::C(
get_float(&mut i),
get_float(&mut i),
get_float(&mut i),
get_float(&mut i),
get_float(&mut i),
get_float(&mut i),
))),
's' => commands.push(PathCommand::Relative(RelativePathCommand::S(
get_float(&mut i),
get_float(&mut i),
get_float(&mut i),
get_float(&mut i),
))),
'q' => commands.push(PathCommand::Relative(RelativePathCommand::Q(
get_float(&mut i),
get_float(&mut i),
get_float(&mut i),
get_float(&mut i),
))),
't' => commands.push(PathCommand::Relative(RelativePathCommand::T(get_float(&mut i), get_float(&mut i)))),
'a' => commands.push(PathCommand::Relative(RelativePathCommand::A(
get_float(&mut i),
get_float(&mut i),
get_float(&mut i),
get_bool(&mut i),
get_bool(&mut i),
get_float(&mut i),
get_float(&mut i),
))),
_ => return Err(BooleanError::InvalidPathCommand(cmd)),
}
}
Ok(commands)
}
pub fn path_from_path_data(d: &str) -> Result<Path, BooleanError> {
Ok(path_from_commands(commands_from_path_data(d)?).collect())
}
pub fn path_to_path_data(path: &Path, eps: f64) -> String {
path_to_commands(path.iter(), eps)
.map(|cmd| match cmd {
PathCommand::Absolute(abs_cmd) => match abs_cmd {
AbsolutePathCommand::H(dx) => format!("H {:.12}", dx),
AbsolutePathCommand::V(dy) => format!("V {:.12}", dy),
AbsolutePathCommand::M(p) => format!("M {:.12},{:.12}", p.x, p.y),
AbsolutePathCommand::L(p) => format!("L {:.12},{:.12}", p.x, p.y),
AbsolutePathCommand::C(p1, p2, p3) => format!("C {:.12},{:.12} {:.12},{:.12} {:.12},{:.12}", p1.x, p1.y, p2.x, p2.y, p3.x, p3.y),
AbsolutePathCommand::S(p1, p2) => {
format!("S {:.12},{:.12} {:.12},{:.12}", p1.x, p1.y, p2.x, p2.y)
}
AbsolutePathCommand::Q(p1, p2) => {
format!("Q {:.12},{:.12} {:.12},{:.12}", p1.x, p1.y, p2.x, p2.y)
}
AbsolutePathCommand::T(p) => format!("T {:.12},{:.12}", p.x, p.y),
AbsolutePathCommand::A(rx, ry, x_axis_rotation, large_arc_flag, sweep_flag, p) => {
format!("A {:.12} {:.12} {:.12} {} {} {:.12},{:.12}", rx, ry, x_axis_rotation, large_arc_flag as u8, sweep_flag as u8, p.x, p.y)
}
AbsolutePathCommand::Z => "Z".to_string(),
},
PathCommand::Relative(rel_cmd) => match rel_cmd {
RelativePathCommand::M(dx, dy) => format!("m {:.12},{:.12}", dx, dy),
RelativePathCommand::L(dx, dy) => format!("l {:.12},{:.12}", dx, dy),
RelativePathCommand::H(dx) => format!("h {:.12}", dx),
RelativePathCommand::V(dy) => format!("v {:.12}", dy),
RelativePathCommand::C(dx1, dy1, dx2, dy2, dx, dy) => format!("c{:.12},{:.12} {:.12},{:.12} {:.12},{:.12}", dx1, dy1, dx2, dy2, dx, dy),
RelativePathCommand::S(dx2, dy2, dx, dy) => {
format!("s {:.12},{:.12} {:.12},{:.12}", dx2, dy2, dx, dy)
}
RelativePathCommand::Q(dx1, dy1, dx, dy) => {
format!("q {:.12},{:.12} {:.12},{:.12}", dx1, dy1, dx, dy)
}
RelativePathCommand::T(dx, dy) => format!("t{:.12},{:.12}", dx, dy),
RelativePathCommand::A(rx, ry, x_axis_rotation, large_arc_flag, sweep_flag, dx, dy) => {
format!("a {:.12} {:.12} {:.12} {} {} {:.12},{:.12}", rx, ry, x_axis_rotation, large_arc_flag as u8, sweep_flag as u8, dx, dy)
}
},
})
.collect::<Vec<String>>()
.join(" ")
}
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