Grcov report - viewbox.rs

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//! Parser for the `viewBox` attribute.

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use cssparser::Parser;

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use std::ops::Deref;

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use crate::error::*;

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use crate::parsers::{NumberList, Parse};

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use crate::rect::Rect;

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/// Newtype around a [`Rect`], used to represent the `viewBox` attribute.

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///

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/// A `ViewBox` is a new user-space coordinate system mapped onto the rectangle defined by

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/// the current viewport.  See <https://www.w3.org/TR/SVG2/coords.html#ViewBoxAttribute>

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///

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/// `ViewBox` derefs to [`Rect`], so you can use [`Rect`]'s methods and fields directly like

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/// `vbox.x0` or `vbox.width()`.

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#[derive(Debug, Copy, Clone, PartialEq)]

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pub struct ViewBox(Rect);

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impl Deref for ViewBox {

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    type Target = Rect;

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    fn deref(&self) -> &Rect {

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        &self.0

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impl From<Rect> for ViewBox {

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    fn from(r: Rect) -> ViewBox {

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        ViewBox(r)

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impl Parse for ViewBox {

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    // Parse a viewBox attribute

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    // https://www.w3.org/TR/SVG/coords.html#ViewBoxAttribute

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//

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    // viewBox: double [,] double [,] double [,] double [,]

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//

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    // x, y, w, h

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//

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    // Where w and h must be nonnegative.

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    fn parse<'i>(parser: &mut Parser<'i, '_>) -> Result<ViewBox, ParseError<'i>> {

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        let loc = parser.current_source_location();

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        let NumberList::<4, 4>(v) = NumberList::parse(parser)?;

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        let (x, y, width, height) = (v[0], v[1], v[2], v[3]);

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        if width >= 0.0 && height >= 0.0 {

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            Ok(ViewBox(Rect::new(x, y, x + width, y + height)))

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        } else {

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            Err(loc.new_custom_error(ValueErrorKind::value_error(

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                "width and height must not be negative",

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)))

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#[cfg(test)]

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mod tests {

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    use super::*;

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    #[test]

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    fn parses_valid_viewboxes() {

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        assert_eq!(

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            ViewBox::parse_str("  1 2 3 4").unwrap(),

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            ViewBox(Rect::new(1.0, 2.0, 4.0, 6.0))

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);

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        assert_eq!(

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            ViewBox::parse_str(" -1.5 -2.5e1,34,56e2  ").unwrap(),

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            ViewBox(Rect::new(-1.5, -25.0, 32.5, 5575.0))

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);

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    #[test]

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    fn parsing_invalid_viewboxes_yields_error() {

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        assert!(ViewBox::parse_str("").is_err());

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        assert!(ViewBox::parse_str(" 1,2,-3,-4 ").is_err());

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        assert!(ViewBox::parse_str("qwerasdfzxcv").is_err());

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        assert!(ViewBox::parse_str(" 1 2 3 4   5").is_err());

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        assert!(ViewBox::parse_str(" 1 2 foo 3 4").is_err());

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        // https://gitlab.gnome.org/GNOME/librsvg/issues/344

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        assert!(ViewBox::parse_str("0 0 9E80.7").is_err());

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