style.rs

  1use std::{iter, mem, ops::Range};
  2
  3use crate::{
  4    black, phi, point, quad, rems, AbsoluteLength, Bounds, ContentMask, Corners, CornersRefinement,
  5    CursorStyle, DefiniteLength, Edges, EdgesRefinement, ElementContext, Font, FontFeatures,
  6    FontStyle, FontWeight, Hsla, Length, Pixels, Point, PointRefinement, Rgba, SharedString, Size,
  7    SizeRefinement, Styled, TextRun,
  8};
  9use collections::HashSet;
 10use refineable::Refineable;
 11use smallvec::SmallVec;
 12pub use taffy::style::{
 13    AlignContent, AlignItems, AlignSelf, Display, FlexDirection, FlexWrap, JustifyContent,
 14    Overflow, Position,
 15};
 16
 17/// Use this struct for interfacing with the 'debug_below' styling from your own elements.
 18/// If a parent element has this style set on it, then this struct will be set as a global in
 19/// GPUI.
 20#[cfg(debug_assertions)]
 21pub struct DebugBelow;
 22
 23#[cfg(debug_assertions)]
 24impl crate::Global for DebugBelow {}
 25
 26/// The CSS styling that can be applied to an element via the `Styled` trait
 27#[derive(Clone, Refineable, Debug)]
 28#[refineable(Debug)]
 29pub struct Style {
 30    /// What layout strategy should be used?
 31    pub display: Display,
 32
 33    /// Should the element be painted on screen?
 34    pub visibility: Visibility,
 35
 36    // Overflow properties
 37    /// How children overflowing their container should affect layout
 38    #[refineable]
 39    pub overflow: Point<Overflow>,
 40    /// How much space (in points) should be reserved for the scrollbars of `Overflow::Scroll` and `Overflow::Auto` nodes.
 41    pub scrollbar_width: f32,
 42
 43    // Position properties
 44    /// What should the `position` value of this struct use as a base offset?
 45    pub position: Position,
 46    /// How should the position of this element be tweaked relative to the layout defined?
 47    #[refineable]
 48    pub inset: Edges<Length>,
 49
 50    // Size properties
 51    /// Sets the initial size of the item
 52    #[refineable]
 53    pub size: Size<Length>,
 54    /// Controls the minimum size of the item
 55    #[refineable]
 56    pub min_size: Size<Length>,
 57    /// Controls the maximum size of the item
 58    #[refineable]
 59    pub max_size: Size<Length>,
 60    /// Sets the preferred aspect ratio for the item. The ratio is calculated as width divided by height.
 61    pub aspect_ratio: Option<f32>,
 62
 63    // Spacing Properties
 64    /// How large should the margin be on each side?
 65    #[refineable]
 66    pub margin: Edges<Length>,
 67    /// How large should the padding be on each side?
 68    #[refineable]
 69    pub padding: Edges<DefiniteLength>,
 70    /// How large should the border be on each side?
 71    #[refineable]
 72    pub border_widths: Edges<AbsoluteLength>,
 73
 74    // Alignment properties
 75    /// How this node's children aligned in the cross/block axis?
 76    pub align_items: Option<AlignItems>,
 77    /// How this node should be aligned in the cross/block axis. Falls back to the parents [`AlignItems`] if not set
 78    pub align_self: Option<AlignSelf>,
 79    /// How should content contained within this item be aligned in the cross/block axis
 80    pub align_content: Option<AlignContent>,
 81    /// How should contained within this item be aligned in the main/inline axis
 82    pub justify_content: Option<JustifyContent>,
 83    /// How large should the gaps between items in a flex container be?
 84    #[refineable]
 85    pub gap: Size<DefiniteLength>,
 86
 87    // Flexbox properties
 88    /// Which direction does the main axis flow in?
 89    pub flex_direction: FlexDirection,
 90    /// Should elements wrap, or stay in a single line?
 91    pub flex_wrap: FlexWrap,
 92    /// Sets the initial main axis size of the item
 93    pub flex_basis: Length,
 94    /// The relative rate at which this item grows when it is expanding to fill space, 0.0 is the default value, and this value must be positive.
 95    pub flex_grow: f32,
 96    /// The relative rate at which this item shrinks when it is contracting to fit into space, 1.0 is the default value, and this value must be positive.
 97    pub flex_shrink: f32,
 98
 99    /// The fill color of this element
100    pub background: Option<Fill>,
101
102    /// The border color of this element
103    pub border_color: Option<Hsla>,
104
105    /// The radius of the corners of this element
106    #[refineable]
107    pub corner_radii: Corners<AbsoluteLength>,
108
109    /// Box Shadow of the element
110    pub box_shadow: SmallVec<[BoxShadow; 2]>,
111
112    /// The text style of this element
113    pub text: TextStyleRefinement,
114
115    /// The mouse cursor style shown when the mouse pointer is over an element.
116    pub mouse_cursor: Option<CursorStyle>,
117
118    /// The z-index to set for this element
119    pub z_index: Option<u16>,
120
121    /// Whether to draw a red debugging outline around this element
122    #[cfg(debug_assertions)]
123    pub debug: bool,
124
125    /// Whether to draw a red debugging outline around this element and all of its conforming children
126    #[cfg(debug_assertions)]
127    pub debug_below: bool,
128}
129
130impl Styled for StyleRefinement {
131    fn style(&mut self) -> &mut StyleRefinement {
132        self
133    }
134}
135
136/// The value of the visibility property, similar to the CSS property `visibility`
137#[derive(Default, Clone, Copy, Debug, Eq, PartialEq)]
138pub enum Visibility {
139    /// The element should be drawn as normal.
140    #[default]
141    Visible,
142    /// The element should not be drawn, but should still take up space in the layout.
143    Hidden,
144}
145
146/// The possible values of the box-shadow property
147#[derive(Clone, Debug)]
148pub struct BoxShadow {
149    /// What color should the shadow have?
150    pub color: Hsla,
151    /// How should it be offset from its element?
152    pub offset: Point<Pixels>,
153    /// How much should the shadow be blurred?
154    pub blur_radius: Pixels,
155    /// How much should the shadow spread?
156    pub spread_radius: Pixels,
157}
158
159/// How to handle whitespace in text
160#[derive(Copy, Clone, Debug, Default, PartialEq, Eq)]
161pub enum WhiteSpace {
162    /// Normal line wrapping when text overflows the width of the element
163    #[default]
164    Normal,
165    /// No line wrapping, text will overflow the width of the element
166    Nowrap,
167}
168
169/// The properties that can be used to style text in GPUI
170#[derive(Refineable, Clone, Debug, PartialEq)]
171#[refineable(Debug)]
172pub struct TextStyle {
173    /// The color of the text
174    pub color: Hsla,
175
176    /// The font family to use
177    pub font_family: SharedString,
178
179    /// The font features to use
180    pub font_features: FontFeatures,
181
182    /// The font size to use, in pixels or rems.
183    pub font_size: AbsoluteLength,
184
185    /// The line height to use, in pixels or fractions
186    pub line_height: DefiniteLength,
187
188    /// The font weight, e.g. bold
189    pub font_weight: FontWeight,
190
191    /// The font style, e.g. italic
192    pub font_style: FontStyle,
193
194    /// The background color of the text
195    pub background_color: Option<Hsla>,
196
197    /// The underline style of the text
198    pub underline: Option<UnderlineStyle>,
199
200    /// The strikethrough style of the text
201    pub strikethrough: Option<StrikethroughStyle>,
202
203    /// How to handle whitespace in the text
204    pub white_space: WhiteSpace,
205}
206
207impl Default for TextStyle {
208    fn default() -> Self {
209        TextStyle {
210            color: black(),
211            // todo(linux) make this configurable or choose better default
212            font_family: if cfg!(target_os = "linux") {
213                "FreeMono".into()
214            } else {
215                "Helvetica".into()
216            },
217            font_features: FontFeatures::default(),
218            font_size: rems(1.).into(),
219            line_height: phi(),
220            font_weight: FontWeight::default(),
221            font_style: FontStyle::default(),
222            background_color: None,
223            underline: None,
224            strikethrough: None,
225            white_space: WhiteSpace::Normal,
226        }
227    }
228}
229
230impl TextStyle {
231    /// Create a new text style with the given highlighting applied.
232    pub fn highlight(mut self, style: impl Into<HighlightStyle>) -> Self {
233        let style = style.into();
234        if let Some(weight) = style.font_weight {
235            self.font_weight = weight;
236        }
237        if let Some(style) = style.font_style {
238            self.font_style = style;
239        }
240
241        if let Some(color) = style.color {
242            self.color = self.color.blend(color);
243        }
244
245        if let Some(factor) = style.fade_out {
246            self.color.fade_out(factor);
247        }
248
249        if let Some(background_color) = style.background_color {
250            self.background_color = Some(background_color);
251        }
252
253        if let Some(underline) = style.underline {
254            self.underline = Some(underline);
255        }
256
257        if let Some(strikethrough) = style.strikethrough {
258            self.strikethrough = Some(strikethrough);
259        }
260
261        self
262    }
263
264    /// Get the font configured for this text style.
265    pub fn font(&self) -> Font {
266        Font {
267            family: self.font_family.clone(),
268            features: self.font_features,
269            weight: self.font_weight,
270            style: self.font_style,
271        }
272    }
273
274    /// Returns the rounded line height in pixels.
275    pub fn line_height_in_pixels(&self, rem_size: Pixels) -> Pixels {
276        self.line_height.to_pixels(self.font_size, rem_size).round()
277    }
278
279    /// Convert this text style into a [`TextRun`], for the given length of the text.
280    pub fn to_run(&self, len: usize) -> TextRun {
281        TextRun {
282            len,
283            font: Font {
284                family: self.font_family.clone(),
285                features: Default::default(),
286                weight: self.font_weight,
287                style: self.font_style,
288            },
289            color: self.color,
290            background_color: self.background_color,
291            underline: self.underline,
292            strikethrough: self.strikethrough,
293        }
294    }
295}
296
297/// A highlight style to apply, similar to a `TextStyle` except
298/// for a single font, uniformly sized and spaced text.
299#[derive(Copy, Clone, Debug, Default, PartialEq)]
300pub struct HighlightStyle {
301    /// The color of the text
302    pub color: Option<Hsla>,
303
304    /// The font weight, e.g. bold
305    pub font_weight: Option<FontWeight>,
306
307    /// The font style, e.g. italic
308    pub font_style: Option<FontStyle>,
309
310    /// The background color of the text
311    pub background_color: Option<Hsla>,
312
313    /// The underline style of the text
314    pub underline: Option<UnderlineStyle>,
315
316    /// The underline style of the text
317    pub strikethrough: Option<StrikethroughStyle>,
318
319    /// Similar to the CSS `opacity` property, this will cause the text to be less vibrant.
320    pub fade_out: Option<f32>,
321}
322
323impl Eq for HighlightStyle {}
324
325impl Style {
326    /// Get the text style in this element style.
327    pub fn text_style(&self) -> Option<&TextStyleRefinement> {
328        if self.text.is_some() {
329            Some(&self.text)
330        } else {
331            None
332        }
333    }
334
335    /// Get the content mask for this element style, based on the given bounds.
336    /// If the element does not hide its overflow, this will return `None`.
337    pub fn overflow_mask(
338        &self,
339        bounds: Bounds<Pixels>,
340        rem_size: Pixels,
341    ) -> Option<ContentMask<Pixels>> {
342        match self.overflow {
343            Point {
344                x: Overflow::Visible,
345                y: Overflow::Visible,
346            } => None,
347            _ => {
348                let mut min = bounds.origin;
349                let mut max = bounds.lower_right();
350
351                if self
352                    .border_color
353                    .map_or(false, |color| !color.is_transparent())
354                {
355                    min.x += self.border_widths.left.to_pixels(rem_size);
356                    max.x -= self.border_widths.right.to_pixels(rem_size);
357                    min.y += self.border_widths.top.to_pixels(rem_size);
358                    max.y -= self.border_widths.bottom.to_pixels(rem_size);
359                }
360
361                let bounds = match (
362                    self.overflow.x == Overflow::Visible,
363                    self.overflow.y == Overflow::Visible,
364                ) {
365                    // x and y both visible
366                    (true, true) => return None,
367                    // x visible, y hidden
368                    (true, false) => Bounds::from_corners(
369                        point(min.x, bounds.origin.y),
370                        point(max.x, bounds.lower_right().y),
371                    ),
372                    // x hidden, y visible
373                    (false, true) => Bounds::from_corners(
374                        point(bounds.origin.x, min.y),
375                        point(bounds.lower_right().x, max.y),
376                    ),
377                    // both hidden
378                    (false, false) => Bounds::from_corners(min, max),
379                };
380
381                Some(ContentMask { bounds })
382            }
383        }
384    }
385
386    /// Paints the background of an element styled with this style.
387    pub fn paint(
388        &self,
389        bounds: Bounds<Pixels>,
390        cx: &mut ElementContext,
391        continuation: impl FnOnce(&mut ElementContext),
392    ) {
393        #[cfg(debug_assertions)]
394        if self.debug_below {
395            cx.set_global(DebugBelow)
396        }
397
398        #[cfg(debug_assertions)]
399        if self.debug || cx.has_global::<DebugBelow>() {
400            cx.paint_quad(crate::outline(bounds, crate::red()));
401        }
402
403        let rem_size = cx.rem_size();
404
405        cx.with_z_index(0, |cx| {
406            cx.paint_shadows(
407                bounds,
408                self.corner_radii.to_pixels(bounds.size, rem_size),
409                &self.box_shadow,
410            );
411        });
412
413        let background_color = self.background.as_ref().and_then(Fill::color);
414        if background_color.map_or(false, |color| !color.is_transparent()) {
415            cx.with_z_index(1, |cx| {
416                let mut border_color = background_color.unwrap_or_default();
417                border_color.a = 0.;
418                cx.paint_quad(quad(
419                    bounds,
420                    self.corner_radii.to_pixels(bounds.size, rem_size),
421                    background_color.unwrap_or_default(),
422                    Edges::default(),
423                    border_color,
424                ));
425            });
426        }
427
428        cx.with_z_index(2, |cx| {
429            continuation(cx);
430        });
431
432        if self.is_border_visible() {
433            cx.with_z_index(3, |cx| {
434                let corner_radii = self.corner_radii.to_pixels(bounds.size, rem_size);
435                let border_widths = self.border_widths.to_pixels(rem_size);
436                let max_border_width = border_widths.max();
437                let max_corner_radius = corner_radii.max();
438
439                let top_bounds = Bounds::from_corners(
440                    bounds.origin,
441                    bounds.upper_right()
442                        + point(Pixels::ZERO, max_border_width.max(max_corner_radius)),
443                );
444                let bottom_bounds = Bounds::from_corners(
445                    bounds.lower_left()
446                        - point(Pixels::ZERO, max_border_width.max(max_corner_radius)),
447                    bounds.lower_right(),
448                );
449                let left_bounds = Bounds::from_corners(
450                    top_bounds.lower_left(),
451                    bottom_bounds.origin + point(max_border_width, Pixels::ZERO),
452                );
453                let right_bounds = Bounds::from_corners(
454                    top_bounds.lower_right() - point(max_border_width, Pixels::ZERO),
455                    bottom_bounds.upper_right(),
456                );
457
458                let mut background = self.border_color.unwrap_or_default();
459                background.a = 0.;
460                let quad = quad(
461                    bounds,
462                    corner_radii,
463                    background,
464                    border_widths,
465                    self.border_color.unwrap_or_default(),
466                );
467
468                cx.with_content_mask(Some(ContentMask { bounds: top_bounds }), |cx| {
469                    cx.paint_quad(quad.clone());
470                });
471                cx.with_content_mask(
472                    Some(ContentMask {
473                        bounds: right_bounds,
474                    }),
475                    |cx| {
476                        cx.paint_quad(quad.clone());
477                    },
478                );
479                cx.with_content_mask(
480                    Some(ContentMask {
481                        bounds: bottom_bounds,
482                    }),
483                    |cx| {
484                        cx.paint_quad(quad.clone());
485                    },
486                );
487                cx.with_content_mask(
488                    Some(ContentMask {
489                        bounds: left_bounds,
490                    }),
491                    |cx| {
492                        cx.paint_quad(quad);
493                    },
494                );
495            });
496        }
497
498        #[cfg(debug_assertions)]
499        if self.debug_below {
500            cx.remove_global::<DebugBelow>();
501        }
502    }
503
504    fn is_border_visible(&self) -> bool {
505        self.border_color
506            .map_or(false, |color| !color.is_transparent())
507            && self.border_widths.any(|length| !length.is_zero())
508    }
509}
510
511impl Default for Style {
512    fn default() -> Self {
513        Style {
514            display: Display::Block,
515            visibility: Visibility::Visible,
516            overflow: Point {
517                x: Overflow::Visible,
518                y: Overflow::Visible,
519            },
520            scrollbar_width: 0.0,
521            position: Position::Relative,
522            inset: Edges::auto(),
523            margin: Edges::<Length>::zero(),
524            padding: Edges::<DefiniteLength>::zero(),
525            border_widths: Edges::<AbsoluteLength>::zero(),
526            size: Size::auto(),
527            min_size: Size::auto(),
528            max_size: Size::auto(),
529            aspect_ratio: None,
530            gap: Size::default(),
531            // Alignment
532            align_items: None,
533            align_self: None,
534            align_content: None,
535            justify_content: None,
536            // Flexbox
537            flex_direction: FlexDirection::Row,
538            flex_wrap: FlexWrap::NoWrap,
539            flex_grow: 0.0,
540            flex_shrink: 1.0,
541            flex_basis: Length::Auto,
542            background: None,
543            border_color: None,
544            corner_radii: Corners::default(),
545            box_shadow: Default::default(),
546            text: TextStyleRefinement::default(),
547            mouse_cursor: None,
548            z_index: None,
549
550            #[cfg(debug_assertions)]
551            debug: false,
552            #[cfg(debug_assertions)]
553            debug_below: false,
554        }
555    }
556}
557
558/// The properties that can be applied to an underline.
559#[derive(Refineable, Copy, Clone, Default, Debug, PartialEq, Eq)]
560#[refineable(Debug)]
561pub struct UnderlineStyle {
562    /// The thickness of the underline.
563    pub thickness: Pixels,
564
565    /// The color of the underline.
566    pub color: Option<Hsla>,
567
568    /// Whether the underline should be wavy, like in a spell checker.
569    pub wavy: bool,
570}
571
572/// The properties that can be applied to a strikethrough.
573#[derive(Refineable, Copy, Clone, Default, Debug, PartialEq, Eq)]
574#[refineable(Debug)]
575pub struct StrikethroughStyle {
576    /// The thickness of the strikethrough.
577    pub thickness: Pixels,
578
579    /// The color of the strikethrough.
580    pub color: Option<Hsla>,
581}
582
583/// The kinds of fill that can be applied to a shape.
584#[derive(Clone, Debug)]
585pub enum Fill {
586    /// A solid color fill.
587    Color(Hsla),
588}
589
590impl Fill {
591    /// Unwrap this fill into a solid color, if it is one.
592    pub fn color(&self) -> Option<Hsla> {
593        match self {
594            Fill::Color(color) => Some(*color),
595        }
596    }
597}
598
599impl Default for Fill {
600    fn default() -> Self {
601        Self::Color(Hsla::default())
602    }
603}
604
605impl From<Hsla> for Fill {
606    fn from(color: Hsla) -> Self {
607        Self::Color(color)
608    }
609}
610
611impl From<Rgba> for Fill {
612    fn from(color: Rgba) -> Self {
613        Self::Color(color.into())
614    }
615}
616
617impl From<TextStyle> for HighlightStyle {
618    fn from(other: TextStyle) -> Self {
619        Self::from(&other)
620    }
621}
622
623impl From<&TextStyle> for HighlightStyle {
624    fn from(other: &TextStyle) -> Self {
625        Self {
626            color: Some(other.color),
627            font_weight: Some(other.font_weight),
628            font_style: Some(other.font_style),
629            background_color: other.background_color,
630            underline: other.underline,
631            strikethrough: other.strikethrough,
632            fade_out: None,
633        }
634    }
635}
636
637impl HighlightStyle {
638    /// Blend this highlight style with another.
639    /// Non-continuous properties, like font_weight and font_style, are overwritten.
640    pub fn highlight(&mut self, other: HighlightStyle) {
641        match (self.color, other.color) {
642            (Some(self_color), Some(other_color)) => {
643                self.color = Some(Hsla::blend(other_color, self_color));
644            }
645            (None, Some(other_color)) => {
646                self.color = Some(other_color);
647            }
648            _ => {}
649        }
650
651        if other.font_weight.is_some() {
652            self.font_weight = other.font_weight;
653        }
654
655        if other.font_style.is_some() {
656            self.font_style = other.font_style;
657        }
658
659        if other.background_color.is_some() {
660            self.background_color = other.background_color;
661        }
662
663        if other.underline.is_some() {
664            self.underline = other.underline;
665        }
666
667        if other.strikethrough.is_some() {
668            self.strikethrough = other.strikethrough;
669        }
670
671        match (other.fade_out, self.fade_out) {
672            (Some(source_fade), None) => self.fade_out = Some(source_fade),
673            (Some(source_fade), Some(dest_fade)) => {
674                self.fade_out = Some((dest_fade * (1. + source_fade)).clamp(0., 1.));
675            }
676            _ => {}
677        }
678    }
679}
680
681impl From<Hsla> for HighlightStyle {
682    fn from(color: Hsla) -> Self {
683        Self {
684            color: Some(color),
685            ..Default::default()
686        }
687    }
688}
689
690impl From<FontWeight> for HighlightStyle {
691    fn from(font_weight: FontWeight) -> Self {
692        Self {
693            font_weight: Some(font_weight),
694            ..Default::default()
695        }
696    }
697}
698
699impl From<FontStyle> for HighlightStyle {
700    fn from(font_style: FontStyle) -> Self {
701        Self {
702            font_style: Some(font_style),
703            ..Default::default()
704        }
705    }
706}
707
708impl From<Rgba> for HighlightStyle {
709    fn from(color: Rgba) -> Self {
710        Self {
711            color: Some(color.into()),
712            ..Default::default()
713        }
714    }
715}
716
717/// Combine and merge the highlights and ranges in the two iterators.
718pub fn combine_highlights(
719    a: impl IntoIterator<Item = (Range<usize>, HighlightStyle)>,
720    b: impl IntoIterator<Item = (Range<usize>, HighlightStyle)>,
721) -> impl Iterator<Item = (Range<usize>, HighlightStyle)> {
722    let mut endpoints = Vec::new();
723    let mut highlights = Vec::new();
724    for (range, highlight) in a.into_iter().chain(b) {
725        if !range.is_empty() {
726            let highlight_id = highlights.len();
727            endpoints.push((range.start, highlight_id, true));
728            endpoints.push((range.end, highlight_id, false));
729            highlights.push(highlight);
730        }
731    }
732    endpoints.sort_unstable_by_key(|(position, _, _)| *position);
733    let mut endpoints = endpoints.into_iter().peekable();
734
735    let mut active_styles = HashSet::default();
736    let mut ix = 0;
737    iter::from_fn(move || {
738        while let Some((endpoint_ix, highlight_id, is_start)) = endpoints.peek() {
739            let prev_index = mem::replace(&mut ix, *endpoint_ix);
740            if ix > prev_index && !active_styles.is_empty() {
741                let mut current_style = HighlightStyle::default();
742                for highlight_id in &active_styles {
743                    current_style.highlight(highlights[*highlight_id]);
744                }
745                return Some((prev_index..ix, current_style));
746            }
747
748            if *is_start {
749                active_styles.insert(*highlight_id);
750            } else {
751                active_styles.remove(highlight_id);
752            }
753            endpoints.next();
754        }
755        None
756    })
757}
758
759#[cfg(test)]
760mod tests {
761    use crate::{blue, green, red, yellow};
762
763    use super::*;
764
765    #[test]
766    fn test_combine_highlights() {
767        assert_eq!(
768            combine_highlights(
769                [
770                    (0..5, green().into()),
771                    (4..10, FontWeight::BOLD.into()),
772                    (15..20, yellow().into()),
773                ],
774                [
775                    (2..6, FontStyle::Italic.into()),
776                    (1..3, blue().into()),
777                    (21..23, red().into()),
778                ]
779            )
780            .collect::<Vec<_>>(),
781            [
782                (
783                    0..1,
784                    HighlightStyle {
785                        color: Some(green()),
786                        ..Default::default()
787                    }
788                ),
789                (
790                    1..2,
791                    HighlightStyle {
792                        color: Some(green()),
793                        ..Default::default()
794                    }
795                ),
796                (
797                    2..3,
798                    HighlightStyle {
799                        color: Some(green()),
800                        font_style: Some(FontStyle::Italic),
801                        ..Default::default()
802                    }
803                ),
804                (
805                    3..4,
806                    HighlightStyle {
807                        color: Some(green()),
808                        font_style: Some(FontStyle::Italic),
809                        ..Default::default()
810                    }
811                ),
812                (
813                    4..5,
814                    HighlightStyle {
815                        color: Some(green()),
816                        font_weight: Some(FontWeight::BOLD),
817                        font_style: Some(FontStyle::Italic),
818                        ..Default::default()
819                    }
820                ),
821                (
822                    5..6,
823                    HighlightStyle {
824                        font_weight: Some(FontWeight::BOLD),
825                        font_style: Some(FontStyle::Italic),
826                        ..Default::default()
827                    }
828                ),
829                (
830                    6..10,
831                    HighlightStyle {
832                        font_weight: Some(FontWeight::BOLD),
833                        ..Default::default()
834                    }
835                ),
836                (
837                    15..20,
838                    HighlightStyle {
839                        color: Some(yellow()),
840                        ..Default::default()
841                    }
842                ),
843                (
844                    21..23,
845                    HighlightStyle {
846                        color: Some(red()),
847                        ..Default::default()
848                    }
849                )
850            ]
851        );
852    }
853}