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use std::fmt;
#[cfg(doctest)]
mod test_readme {
macro_rules! external_doc_test {
($x:expr) => {
#[doc = $x]
extern "C" {}
};
}
external_doc_test!(include_str!("../README.md"));
}
pub enum PathCommand<F: fmt::Display> {
M(F, F),
M_(F, F),
L(F, F),
L_(F, F),
H(F),
H_(F),
V(F),
V_(F),
C(F, F, F, F, F, F),
C_(F, F, F, F, F, F),
S(F, F, F, F),
S_(F, F, F, F),
Q(F, F, F, F),
Q_(F, F, F, F),
T(F, F),
T_(F, F),
A(F, F, F, F, F, F, F),
A_(F, F, F, F, F, F, F),
Z(F),
}
impl<F: fmt::Display> PathCommand<F> {
fn write<T: fmt::Write>(&self, writer: &mut T) -> fmt::Result {
use PathCommand::*;
match self {
M(x, y) => {
write!(writer, " M {} {}", x, y)
}
M_(x, y) => {
write!(writer, " m {} {}", x, y)
}
L(x, y) => {
write!(writer, " L {} {}", x, y)
}
L_(x, y) => {
write!(writer, " l {} {}", x, y)
}
H(a) => {
write!(writer, " H {}", a)
}
H_(a) => {
write!(writer, " h {}", a)
}
V(a) => {
write!(writer, " V {}", a)
}
V_(a) => {
write!(writer, " v {}", a)
}
C(x1, y1, x2, y2, x, y) => {
write!(writer, " C {} {}, {} {}, {} {}", x1, y1, x2, y2, x, y)
}
C_(dx1, dy1, dx2, dy2, dx, dy) => {
write!(writer, " c {} {}, {} {}, {} {}", dx1, dy1, dx2, dy2, dx, dy)
}
S(x2, y2, x, y) => {
write!(writer, " S {},{} {} {}", x2, y2, x, y)
}
S_(x2, y2, x, y) => {
write!(writer, " s {},{} {} {}", x2, y2, x, y)
}
Q(x1, y1, x, y) => {
write!(writer, " Q {} {}, {} {}", x1, y1, x, y)
}
Q_(dx1, dy1, dx, dy) => {
write!(writer, " q {} {}, {} {}", dx1, dy1, dx, dy)
}
T(x, y) => {
write!(writer, " T {} {}", x, y)
}
T_(x, y) => {
write!(writer, " t {} {}", x, y)
}
A(rx, ry, x_axis_rotation, large_arc_flag, sweep_flag, x, y) => {
write!(
writer,
" A {} {} {} {} {} {} {}",
rx, ry, x_axis_rotation, large_arc_flag, sweep_flag, x, y
)
}
A_(rx, ry, x_axis_rotation, large_arc_flag, sweep_flag, dx, dy) => {
write!(
writer,
" a {} {} {} {} {} {} {}",
rx, ry, x_axis_rotation, large_arc_flag, sweep_flag, dx, dy
)
}
Z(_) => {
write!(writer, " Z")
}
}
}
}
pub struct PathBuilder<'a, T> {
writer: &'a mut T,
}
impl<'a, T: fmt::Write> PathBuilder<'a, T> {
pub fn put(&mut self, command: crate::PathCommand<impl fmt::Display>) -> fmt::Result {
command.write(&mut self.writer)
}
}
pub struct PointsBuilder<'a, T> {
writer: &'a mut T,
}
impl<'a, T: fmt::Write> PointsBuilder<'a, T> {
pub fn put(&mut self, x: impl fmt::Display, y: impl fmt::Display) -> fmt::Result {
write!(self.writer, "{},{} ", x, y)
}
}
pub struct Adaptor<T> {
pub inner: T,
pub error: Result<(), std::io::Error>,
}
pub fn new<T: fmt::Write>(a: T) -> ElemWriter<T> {
ElemWriter(a)
}
pub fn upgrade_write<T: std::io::Write>(inner: T) -> Adaptor<T> {
Adaptor {
inner,
error: Ok(()),
}
}
impl<T: std::io::Write> std::fmt::Write for Adaptor<T> {
fn write_str(&mut self, s: &str) -> std::fmt::Result {
match self.inner.write_all(s.as_bytes()) {
Ok(()) => Ok(()),
Err(e) => {
self.error = Err(e);
Err(std::fmt::Error)
}
}
}
}
#[must_use]
pub struct ElementBridge<'a, T, D, K> {
writer: &'a mut ElemWriter<T>,
tag: D,
pub k: K,
}
impl<'a, T: fmt::Write, D: fmt::Display, K> ElementBridge<'a, T, D, K> {
pub fn build<J>(self, func: impl FnOnce(&mut ElemWriter<T>) -> Result<J,fmt::Error>) -> Result<J,fmt::Error> {
let k = func(self.writer)?;
write!(self.writer.0, "</{}>", self.tag)?;
Ok(k)
}
}
pub struct AttrWriter<'a, T>(&'a mut T);
impl<'a, T: fmt::Write> AttrWriter<'a, T> {
pub fn attr(&mut self, a: impl fmt::Display, b: impl fmt::Display) -> fmt::Result {
write!(self.0, " {}=\"{}\"", a, b)
}
pub fn writer(&mut self) -> &mut T {
&mut self.0
}
pub fn put_raw(&mut self, a: impl fmt::Display) -> fmt::Result {
write!(self.0, " {}", a)
}
pub fn path(&mut self, a: impl FnOnce(&mut PathBuilder<T>) -> fmt::Result) -> fmt::Result {
let mut p = PathBuilder { writer: self.0 };
write!(p.writer, " d=\"")?;
a(&mut p)?;
write!(p.writer, "\"")
}
pub fn points(&mut self, a: impl FnOnce(&mut PointsBuilder<T>) -> fmt::Result) -> fmt::Result {
let mut p = PointsBuilder { writer: self.0 };
write!(p.writer, " points=\"")?;
a(&mut p)?;
write!(p.writer, "\"")
}
}
pub struct ElemWriter<T>(T);
impl<T: fmt::Write> ElemWriter<T> {
pub fn into_writer(self) -> T {
self.0
}
pub fn writer(&mut self) -> &mut T {
&mut self.0
}
pub fn put_raw(&mut self, a: impl fmt::Display) -> fmt::Result {
write!(self.0, " {}", a)
}
pub fn single<D: fmt::Display>(
&mut self,
tag: D,
func: impl FnOnce(&mut AttrWriter<T>) -> fmt::Result,
) -> fmt::Result {
write!(self.0, "<{} ", tag)?;
func(&mut AttrWriter(&mut self.0))?;
write!(self.0, " />")
}
pub fn elem<D: fmt::Display, K>(
&mut self,
tag: D,
func: impl FnOnce(&mut AttrWriter<T>) -> Result<K, fmt::Error>,
) -> Result<ElementBridge<T, D, K>, fmt::Error> {
write!(self.0, "<{} ", tag)?;
let k = func(&mut AttrWriter(&mut self.0))?;
write!(self.0, " >")?;
Ok(ElementBridge {
writer: self,
tag,
k,
})
}
}
pub fn no_attr<T>() -> impl FnOnce(&mut AttrWriter<T>) -> fmt::Result {
move |_| Ok(())
}