//! The stylesheets: the style groups of every chart type, a chart's own stylesheet and the
//! shared one, both built from the groups in one order, and the print variant.
use std::fmt::Write;
use crate::spec::{ChartSpec, ChartType, Dash, Mark, Stroke, Theme};
/// The light palette. Every color is a CSS custom property so a host page can override a single
/// color, and so the dark palette below only has to restate the values.
const STYLE: &str = ".chartlet-root{--chartlet-text:#172033;--chartlet-muted:#344054;--chartlet-grid:#d9dee8;--chartlet-zero:#667085;--chartlet-accent:#2563eb;--chartlet-background:#fff;--chartlet-color-1:#2563eb;--chartlet-color-2:#c2410c;--chartlet-color-3:#475569;--chartlet-color-4:#111827;max-width:100%;height:auto;font-family:Inter,ui-sans-serif,system-ui,sans-serif;color:var(--chartlet-text)}.chartlet-title{font-size:22px;font-weight:650;fill:var(--chartlet-text)}.chartlet-label,.chartlet-tick,.chartlet-value,.chartlet-value-inverse,.chartlet-axis-title{font-size:12px;fill:var(--chartlet-muted)}.chartlet-value,.chartlet-value-inverse{font-weight:600}.chartlet-value{fill:var(--chartlet-text)}.chartlet-value-inverse{fill:var(--chartlet-background)}.chartlet-axis-title{font-weight:600}.chartlet-grid{stroke:var(--chartlet-grid);stroke-width:1}.chartlet-zero{stroke:var(--chartlet-zero);stroke-width:1.5}.chartlet-bar,.chartlet-point{fill:var(--chartlet-accent)}.chartlet-line{fill:none;stroke:var(--chartlet-accent);stroke-width:3;stroke-linecap:round;stroke-linejoin:round}.chartlet-background{fill:var(--chartlet-background)}";
/// The dark palette. A dark chart paints its own background: unlike the light profile it cannot
/// rely on the page behind it, which may be any color.
const DARK_STYLE: &str = ".chartlet-theme-dark{--chartlet-text:#e8edf6;--chartlet-muted:#a9b4c7;--chartlet-grid:#2a3342;--chartlet-zero:#7b8697;--chartlet-accent:#7ea6ff;--chartlet-background:#0e131c;--chartlet-color-1:#7ea6ff;--chartlet-color-2:#ff9c72;--chartlet-color-3:#9aa7bd;--chartlet-color-4:#e2e8f4}";
/// The blueprint look of a diagram: white-blue lines on a deep blue ground. It rests on the dark
/// palette, so it only restates what differs; the roles keep their order of hue by lightness.
const BLUEPRINT_STYLE: &str = ".chartlet-blueprint{--chartlet-text:#eaf4ff;--chartlet-muted:#b8d4f2;--chartlet-grid:#3d73ab;--chartlet-zero:#8fb8e0;--chartlet-accent:#7fd3ff;--chartlet-background:#0b3a68;--chartlet-node:#12497f;--chartlet-lane:#0e4073;--chartlet-lane-head:#14518d;--chartlet-shadow:rgba(0,0,0,0);--chartlet-role-blue:#8ecbff;--chartlet-role-blue-fill:#12497f;--chartlet-role-green:#9ae6b4;--chartlet-role-green-fill:#0f4d63;--chartlet-role-amber:#ffd98a;--chartlet-role-amber-fill:#1a4a6e;--chartlet-role-teal:#7fe3d6;--chartlet-role-teal-fill:#0c4b66;--chartlet-role-violet:#cbbaff;--chartlet-role-violet-fill:#1d4378;--chartlet-role-gray:#b8c9dc;--chartlet-role-gray-fill:#133f6e;--chartlet-role-red:#ffa198;--chartlet-role-red-fill:#183f6a}";
/// Only emitted for multi-series charts. The palette stays distinguishable under simulated
/// protanopia, deuteranopia and tritanopia and keeps at least 4.5:1 contrast against the
/// theme background.
const SERIES_STYLE: &str = ".chartlet-legend{font-size:12px;fill:var(--chartlet-muted)}.chartlet-series-1{fill:var(--chartlet-color-1)}.chartlet-series-2{fill:var(--chartlet-color-2)}.chartlet-series-3{fill:var(--chartlet-color-3)}.chartlet-series-4{fill:var(--chartlet-color-4)}";
/// Strokes for time layers that declare no color of their own; the same palette as the bars.
const LINE_SERIES_STYLE: &str = ".chartlet-legend{font-size:12px;fill:var(--chartlet-muted)}.chartlet-line-series-1{stroke:var(--chartlet-color-1)}.chartlet-line-series-2{stroke:var(--chartlet-color-2)}.chartlet-line-series-3{stroke:var(--chartlet-color-3)}.chartlet-line-series-4{stroke:var(--chartlet-color-4)}.chartlet-point-series-1{fill:var(--chartlet-color-1)}.chartlet-hit{fill:transparent;stroke:none}";
/// CSS rules that hide series when their checkbox is deselected (HTML profile only).
/// Browsers that don't understand `:has()` ignore these rules; the chart stays fully visible.
/// Bands, modeled lines, reference lines and further palette markers of time charts and small
/// multiples. Only included when a chart uses one of them, so that existing charts keep their
/// bytes.
/// Outlined series of a bar chart with `patterns`: the background inside, the series color
/// around it.
const OUTLINE_STYLE: &str = ".chartlet-outline{fill:var(--chartlet-background);stroke-width:2}.chartlet-series-2.chartlet-outline{stroke:var(--chartlet-color-2)}.chartlet-series-4.chartlet-outline{stroke:var(--chartlet-color-4)}";
/// The smaller title of a narrow chart, such as a mobile variant.
const SMALL_TITLE_STYLE: &str = ".chartlet-title-small{font-size:18px}";
/// The reference lines of a bar chart, drawn like the reference lines of a time chart in
/// [`LAYER_EXTRA_STYLE`].
const REFERENCE_STYLE: &str = ".chartlet-rule{fill:none;stroke:var(--chartlet-zero);stroke-width:1.5;stroke-dasharray:5 4}.chartlet-rule-label{font-size:12px;font-weight:600;fill:var(--chartlet-text);paint-order:stroke;stroke:var(--chartlet-background);stroke-width:3px;stroke-linejoin:round}";
const LAYER_EXTRA_STYLE: &str = ".chartlet-band{stroke:none;fill-opacity:.18}.chartlet-band-series-1{fill:var(--chartlet-color-1)}.chartlet-band-series-2{fill:var(--chartlet-color-2)}.chartlet-band-series-3{fill:var(--chartlet-color-3)}.chartlet-band-series-4{fill:var(--chartlet-color-4)}.chartlet-hatch{stroke:none}.chartlet-hatch-line{stroke-width:1.2;opacity:.75}.chartlet-line-modeled{stroke-dasharray:7 5}.chartlet-line-thin{stroke-width:1}.chartlet-point-series-2{fill:var(--chartlet-color-2)}.chartlet-point-series-3{fill:var(--chartlet-color-3)}.chartlet-point-series-4{fill:var(--chartlet-color-4)}.chartlet-rule{fill:none;stroke:var(--chartlet-zero);stroke-width:1.5;stroke-dasharray:5 4}.chartlet-rule-label{font-size:12px;font-weight:600;fill:var(--chartlet-text);paint-order:stroke;stroke:var(--chartlet-background);stroke-width:3px;stroke-linejoin:round}";
/// Areas, line patterns other than the modeled dash, and bold lines. Only included when a chart
/// uses one of them, for the same reason as [`LAYER_EXTRA_STYLE`].
const MARK_EXTRA_STYLE: &str = ".chartlet-area{stroke:none;fill-opacity:.18}.chartlet-line-dashed{stroke-dasharray:7 5}.chartlet-line-dotted{stroke-dasharray:0 7}.chartlet-line-thin.chartlet-line-dotted{stroke-dasharray:1 3}.chartlet-line-bold{stroke-width:4.5}.chartlet-multiples .chartlet-line-bold{stroke-width:3}";
/// Medium lines, in the charts that draw one.
const MEDIUM_LINE_STYLE: &str = ".chartlet-line-medium{stroke-width:2}.chartlet-multiples .chartlet-line-medium{stroke-width:1.5}";
/// Zones and point markers of time charts. Only included when a chart uses one of them, for the
/// same reason as [`LAYER_EXTRA_STYLE`]. A marker is ringed in the background color so that it
/// stands apart from the line it sits on.
const ANNOTATION_EXTRA_STYLE: &str = ".chartlet-zone{fill:var(--chartlet-zero);fill-opacity:.14;stroke:none}.chartlet-marker{fill:var(--chartlet-text);stroke:var(--chartlet-background);stroke-width:1.5;stroke-linejoin:round}";
/// Candlesticks. A rising candle is hollow and a falling one filled, so the direction does not
/// rest on the two colors; both keep at least 4.5:1 against the background of their theme, and
/// they differ in lightness too (about 1.9:1 light, 3.1:1 dark), which grayscale print and
/// color-vision deficiencies keep. Only
/// included when a chart draws candles, for the same reason as [`LAYER_EXTRA_STYLE`].
const OHLC_STYLE: &str = ".chartlet-root{--chartlet-rise:#0a4f49;--chartlet-fall:#d03a0f}.chartlet-theme-dark{--chartlet-rise:#99f6e4;--chartlet-fall:#e5484d}.chartlet-wick{stroke-width:1.5}.chartlet-wick-rise{stroke:var(--chartlet-rise)}.chartlet-wick-fall{stroke:var(--chartlet-fall)}.chartlet-candle{stroke-width:1.5}.chartlet-candle-rise{fill:var(--chartlet-background);stroke:var(--chartlet-rise)}.chartlet-candle-fall{fill:var(--chartlet-fall);stroke:var(--chartlet-fall)}";
/// Small multiples draw thinner lines, because their plots are small.
const MULTIPLES_STYLE: &str = ".chartlet-multiples .chartlet-line{stroke-width:2}.chartlet-panel-title{font-size:13px;font-weight:650;fill:var(--chartlet-text)}";
/// The note under a panel title, in small multiples that have one.
const PANEL_NOTE_STYLE: &str = ".chartlet-panel-note{font-size:12px;fill:var(--chartlet-muted)}.chartlet-panel-note-strong{fill:var(--chartlet-text);font-weight:600}";
/// Cells of a calendar without a value: outlined, not filled.
const CALENDAR_STYLE: &str =
".chartlet-calendar-empty{fill:none;stroke:var(--chartlet-grid);stroke-width:1}";
/// Range bars: a translucent span in the accent color, a hatch on top of a modeled one, and a
/// strong mark for the central value.
/// Box plots: the box, its median, whiskers and the points beyond them.
/// Timelines: phases in the colors of their groups, milestones, markers and arrows.
const TIMELINE_STYLE: &str = ".chartlet-timeline-phase{fill:var(--chartlet-accent);stroke:none;rx:3px}.chartlet-timeline-milestone{fill:var(--chartlet-accent);stroke:var(--chartlet-background);stroke-width:1.5}.chartlet-timeline-group-1{fill:var(--chartlet-color-1)}.chartlet-timeline-group-2{fill:var(--chartlet-color-2)}.chartlet-timeline-group-3{fill:var(--chartlet-color-3)}.chartlet-timeline-group-4{fill:var(--chartlet-color-4)}.chartlet-timeline-weekend{fill:var(--chartlet-grid);fill-opacity:.55;stroke:none}.chartlet-timeline-done{fill:var(--chartlet-text);fill-opacity:.35;stroke:none;rx:3px}.chartlet-timeline-marker{stroke:var(--chartlet-text);stroke-width:1.5;stroke-dasharray:5 4}.chartlet-timeline-marker-label{font-size:12px;font-weight:600;fill:var(--chartlet-text)}.chartlet-timeline-link{fill:none;stroke:var(--chartlet-zero);stroke-width:1.4;stroke-linejoin:round}.chartlet-timeline-head{fill:var(--chartlet-zero);stroke:var(--chartlet-zero);stroke-width:1;stroke-linejoin:round}.chartlet-legend{font-size:12px;fill:var(--chartlet-muted)}";
/// Waterfalls: bars that rise, fall and total.
const WATERFALL_STYLE: &str = ".chartlet-wf-up{fill:var(--chartlet-color-1);stroke:none}.chartlet-wf-down{fill:var(--chartlet-color-2);stroke:none}.chartlet-wf-total{fill:var(--chartlet-color-3);stroke:none}.chartlet-wf-link{stroke:var(--chartlet-zero);stroke-width:1;stroke-dasharray:3 3}";
/// Waffles: squares in the palette colors, and the rest.
const WAFFLE_STYLE: &str = ".chartlet-waffle-1{fill:var(--chartlet-color-1)}.chartlet-waffle-2{fill:var(--chartlet-color-2)}.chartlet-waffle-3{fill:var(--chartlet-color-3)}.chartlet-waffle-4{fill:var(--chartlet-color-4)}.chartlet-waffle-rest{fill:var(--chartlet-grid)}.chartlet-waffle-cell{stroke:none;rx:2px}.chartlet-legend{font-size:12px;fill:var(--chartlet-muted)}";
/// Parliaments: seats by party, the majority line and the ring of a coalition.
const PARLIAMENT_STYLE: &str = ".chartlet-root{--chartlet-parl-5:#0f766e;--chartlet-parl-6:#6d28d9;--chartlet-parl-7:#b45309;--chartlet-parl-8:#be185d}.chartlet-root.chartlet-theme-dark{--chartlet-parl-5:#2dd4bf;--chartlet-parl-6:#b69cff;--chartlet-parl-7:#fbbf24;--chartlet-parl-8:#f472b6}.chartlet-parl-1{fill:var(--chartlet-color-1)}.chartlet-parl-2{fill:var(--chartlet-color-2)}.chartlet-parl-3{fill:var(--chartlet-color-3)}.chartlet-parl-4{fill:var(--chartlet-color-4)}.chartlet-parl-5{fill:var(--chartlet-parl-5)}.chartlet-parl-6{fill:var(--chartlet-parl-6)}.chartlet-parl-7{fill:var(--chartlet-parl-7)}.chartlet-parl-8{fill:var(--chartlet-parl-8)}.chartlet-parl-seat{stroke:none}.chartlet-parl-coalition{fill:none;stroke:var(--chartlet-text);stroke-width:2}.chartlet-parl-majority{stroke:var(--chartlet-text);stroke-width:1.5;stroke-dasharray:4 3}.chartlet-parl-total{font-size:28px;font-weight:700;fill:var(--chartlet-text)}.chartlet-parl-note{font-size:12px;fill:var(--chartlet-muted)}.chartlet-legend{font-size:12px;fill:var(--chartlet-muted)}";
/// Treemaps: the rectangles in the palette colors.
const TREEMAP_STYLE: &str = ".chartlet-tm-0{fill:var(--chartlet-color-1)}.chartlet-tm-1{fill:var(--chartlet-color-1)}.chartlet-tm-2{fill:var(--chartlet-color-2)}.chartlet-tm-3{fill:var(--chartlet-color-3)}.chartlet-tm-4{fill:var(--chartlet-color-4)}.chartlet-tm-cell{stroke:none}.chartlet-tm-frame{fill-opacity:.12;stroke-width:1.5}.chartlet-tm-frame.chartlet-tm-0,.chartlet-tm-frame.chartlet-tm-1{stroke:var(--chartlet-color-1)}.chartlet-tm-frame.chartlet-tm-2{stroke:var(--chartlet-color-2)}.chartlet-tm-frame.chartlet-tm-3{stroke:var(--chartlet-color-3)}.chartlet-tm-frame.chartlet-tm-4{stroke:var(--chartlet-color-4)}.chartlet-tm-head{font-size:12px;font-weight:600;fill:var(--chartlet-text)}.chartlet-tm-label{font-size:12px;font-weight:600;fill:var(--chartlet-background)}.chartlet-tm-value{font-size:11px;fill:var(--chartlet-background);opacity:.9}.chartlet-legend{font-size:12px;fill:var(--chartlet-muted)}";
/// Sankey diagrams: the bands and nodes in the palette colors.
const SANKEY_STYLE: &str = ".chartlet-sk-1{fill:var(--chartlet-color-1)}.chartlet-sk-2{fill:var(--chartlet-color-2)}.chartlet-sk-3{fill:var(--chartlet-color-3)}.chartlet-sk-4{fill:var(--chartlet-color-4)}.chartlet-sk-node{stroke:none}.chartlet-sk-link{stroke:none;opacity:.35}.chartlet-sk-label{font-size:12px;font-weight:600;fill:var(--chartlet-text)}.chartlet-sk-value{font-size:11px;fill:var(--chartlet-muted)}";
/// Kaplan-Meier curves: step lines, bands, marks and swatches in the palette colors.
const SURVIVAL_STYLE: &str = ".chartlet-km-1{fill:var(--chartlet-color-1);stroke:var(--chartlet-color-1)}.chartlet-km-2{fill:var(--chartlet-color-2);stroke:var(--chartlet-color-2)}.chartlet-km-3{fill:var(--chartlet-color-3);stroke:var(--chartlet-color-3)}.chartlet-km-4{fill:var(--chartlet-color-4);stroke:var(--chartlet-color-4)}.chartlet-km-line{fill:none;stroke-width:2.5;stroke-linejoin:round}.chartlet-km-band{stroke:none;fill-opacity:.15}.chartlet-km-mark{stroke-width:1.5}.chartlet-km-swatch{stroke:none}.chartlet-legend{font-size:12px;fill:var(--chartlet-muted)}";
/// Scatter plots: dots and swatches in the palette colors, threshold lines and names.
const SCATTER_STYLE: &str = ".chartlet-sc-1{fill:var(--chartlet-color-1)}.chartlet-sc-2{fill:var(--chartlet-color-2)}.chartlet-sc-3{fill:var(--chartlet-color-3)}.chartlet-sc-4{fill:var(--chartlet-color-4)}.chartlet-sc-dot{fill-opacity:.65;stroke:none}.chartlet-sc-swatch{stroke:none;rx:5px}.chartlet-sc-fit{stroke-width:2;fill:none}.chartlet-sc-fit.chartlet-sc-1{stroke:var(--chartlet-color-1)}.chartlet-sc-fit.chartlet-sc-2{stroke:var(--chartlet-color-2)}.chartlet-sc-fit.chartlet-sc-3{stroke:var(--chartlet-color-3)}.chartlet-sc-fit.chartlet-sc-4{stroke:var(--chartlet-color-4)}.chartlet-sc-line{stroke:var(--chartlet-zero);stroke-width:1.5;stroke-dasharray:5 4}.chartlet-sc-label{font-size:11px;font-weight:600;fill:var(--chartlet-text);paint-order:stroke;stroke:var(--chartlet-background);stroke-width:3px;stroke-linejoin:round}.chartlet-legend{font-size:12px;fill:var(--chartlet-muted)}";
/// Class diagrams, on top of [`DIAGRAM_STYLE`] and [`FLOW_STYLE`]: the members of a class, the
/// hollow and solid marks at the ends of relations, and their cardinalities.
const CLASSES_STYLE: &str = ".chartlet-class-member{font-size:12px;fill:var(--chartlet-text)}.chartlet-flow-card{font-size:11px;fill:var(--chartlet-muted)}.chartlet-flow-hollow{fill:var(--chartlet-background)}.chartlet-flow-solid{fill:var(--chartlet-zero)}.chartlet-flow-open{fill:none;stroke:var(--chartlet-zero);stroke-width:1.4;stroke-linejoin:round}";
/// The error bars of a bar chart.
const ERROR_STYLE: &str =
".chartlet-error{stroke:var(--chartlet-text);stroke-width:1.5;stroke-linecap:round}";
/// Box plots: the box, its median, whiskers and the points beyond them.
const BOXPLOT_STYLE: &str = ".chartlet-box{fill:var(--chartlet-accent);fill-opacity:.3;stroke:var(--chartlet-accent);stroke-width:1.5}.chartlet-box-median{stroke:var(--chartlet-text);stroke-width:3}.chartlet-box-whisker{stroke:var(--chartlet-accent);stroke-width:1.5;fill:none}.chartlet-box-outlier{fill:none;stroke:var(--chartlet-accent);stroke-width:1.5}.chartlet-violin{fill:var(--chartlet-accent);fill-opacity:.3;stroke:var(--chartlet-accent);stroke-width:1.5;stroke-linejoin:round}.chartlet-violin-box{fill:var(--chartlet-text);stroke:none}.chartlet-violin-median{fill:var(--chartlet-background);stroke:none}.chartlet-box-mean{fill:var(--chartlet-background);stroke:var(--chartlet-text);stroke-width:1.5}.chartlet-box-g1.chartlet-box,.chartlet-box-g1.chartlet-violin{fill:var(--chartlet-color-1);stroke:var(--chartlet-color-1)}.chartlet-box-g1.chartlet-box-whisker,.chartlet-box-g1.chartlet-box-outlier{stroke:var(--chartlet-color-1)}.chartlet-box-g1.chartlet-box-point{fill:var(--chartlet-color-1)}.chartlet-box-g2.chartlet-box,.chartlet-box-g2.chartlet-violin{fill:var(--chartlet-color-2);stroke:var(--chartlet-color-2)}.chartlet-box-g2.chartlet-box-whisker,.chartlet-box-g2.chartlet-box-outlier{stroke:var(--chartlet-color-2)}.chartlet-box-g2.chartlet-box-point{fill:var(--chartlet-color-2)}.chartlet-box-g3.chartlet-box,.chartlet-box-g3.chartlet-violin{fill:var(--chartlet-color-3);stroke:var(--chartlet-color-3)}.chartlet-box-g3.chartlet-box-whisker,.chartlet-box-g3.chartlet-box-outlier{stroke:var(--chartlet-color-3)}.chartlet-box-g3.chartlet-box-point{fill:var(--chartlet-color-3)}.chartlet-box-g4.chartlet-box,.chartlet-box-g4.chartlet-violin{fill:var(--chartlet-color-4);stroke:var(--chartlet-color-4)}.chartlet-box-g4.chartlet-box-whisker,.chartlet-box-g4.chartlet-box-outlier{stroke:var(--chartlet-color-4)}.chartlet-box-g4.chartlet-box-point{fill:var(--chartlet-color-4)}.chartlet-legend{font-size:12px;fill:var(--chartlet-muted)}.chartlet-box-point{fill:var(--chartlet-accent);fill-opacity:.55;stroke:none}";
const RANGEBAR_STYLE: &str = ".chartlet-range{fill:var(--chartlet-accent);fill-opacity:.3;stroke:var(--chartlet-accent);stroke-width:1}.chartlet-range-hatch{stroke:none}.chartlet-hatch-line{stroke:var(--chartlet-accent);stroke-width:1.2;opacity:.75}.chartlet-range-mid{stroke:var(--chartlet-text);stroke-width:3}.chartlet-range-weight{fill:var(--chartlet-text);stroke:none}.chartlet-range-summary{fill:var(--chartlet-text);fill-opacity:.85;stroke:var(--chartlet-text);stroke-width:1}.chartlet-legend{font-size:12px;fill:var(--chartlet-muted)}";
/// Range bars in groups: each group's spans in its palette color.
const RANGE_GROUP_STYLE: &str = ".chartlet-range-series-1{fill:var(--chartlet-color-1);stroke:var(--chartlet-color-1)}.chartlet-range-series-2{fill:var(--chartlet-color-2);stroke:var(--chartlet-color-2)}.chartlet-range-series-3{fill:var(--chartlet-color-3);stroke:var(--chartlet-color-3)}.chartlet-range-series-4{fill:var(--chartlet-color-4);stroke:var(--chartlet-color-4)}";
/// What every diagram shares: the colors of its roles, shadows, chips and number badges. Each
/// role is a stroke and a light fill, at least 3:1 against the background in both themes; the
/// role never rests on its color alone, the shape of a step says it too. The custom properties
/// are declared here rather than in the shared palette for the same reason as `--chartlet-sea`.
const DIAGRAM_STYLE: &str = ".chartlet-root{--chartlet-node:#eef3fd;--chartlet-lane:#f7f9fc;--chartlet-lane-head:#eef1f6;--chartlet-shadow:rgba(16,24,40,.09);--chartlet-role-blue:#2563eb;--chartlet-role-blue-fill:#eef3fd;--chartlet-role-green:#15803d;--chartlet-role-green-fill:#ecfdf3;--chartlet-role-amber:#b45309;--chartlet-role-amber-fill:#fff7e8;--chartlet-role-teal:#0f766e;--chartlet-role-teal-fill:#e9faf7;--chartlet-role-violet:#6d28d9;--chartlet-role-violet-fill:#f3efff;--chartlet-role-gray:#667085;--chartlet-role-gray-fill:#f7f8fa;--chartlet-role-red:#b42318;--chartlet-role-red-fill:#fef3f2}.chartlet-theme-dark{--chartlet-node:#1a2436;--chartlet-lane:#121925;--chartlet-lane-head:#18212f;--chartlet-shadow:rgba(0,0,0,.45);--chartlet-role-blue:#7ea6ff;--chartlet-role-blue-fill:#1a2436;--chartlet-role-green:#4ade80;--chartlet-role-green-fill:#132a1d;--chartlet-role-amber:#fbbf24;--chartlet-role-amber-fill:#2b2210;--chartlet-role-teal:#2dd4bf;--chartlet-role-teal-fill:#0f2a27;--chartlet-role-violet:#b69cff;--chartlet-role-violet-fill:#231c38;--chartlet-role-gray:#9aa7bd;--chartlet-role-gray-fill:#161d29;--chartlet-role-red:#f97066;--chartlet-role-red-fill:#2d1616}.chartlet-role-blue{fill:var(--chartlet-role-blue-fill);stroke:var(--chartlet-role-blue)}.chartlet-role-green{fill:var(--chartlet-role-green-fill);stroke:var(--chartlet-role-green)}.chartlet-role-amber{fill:var(--chartlet-role-amber-fill);stroke:var(--chartlet-role-amber)}.chartlet-role-teal{fill:var(--chartlet-role-teal-fill);stroke:var(--chartlet-role-teal)}.chartlet-role-violet{fill:var(--chartlet-role-violet-fill);stroke:var(--chartlet-role-violet)}.chartlet-role-gray{fill:var(--chartlet-role-gray-fill);stroke:var(--chartlet-role-gray)}.chartlet-role-red{fill:var(--chartlet-role-red-fill);stroke:var(--chartlet-role-red)}.chartlet-diagram-rim{fill:none;stroke:var(--chartlet-role-teal);stroke-width:1.5}.chartlet-diagram-shadow{fill:var(--chartlet-shadow);stroke:none;rx:7px}.chartlet-diagram-chip{fill:var(--chartlet-background);stroke:var(--chartlet-grid);stroke-width:1;rx:4px}.chartlet-diagram-chip-text{font-size:12px;fill:var(--chartlet-text)}.chartlet-diagram-badge{fill:var(--chartlet-accent);stroke:var(--chartlet-background);stroke-width:2}.chartlet-diagram-badge-text{font-size:10px;font-weight:700;fill:var(--chartlet-background)}";
/// Sequence diagrams, on top of [`DIAGRAM_STYLE`]. Branch conditions are ringed in the background
/// color, so that they stay legible where they cross a lifeline.
const SEQUENCE_STYLE: &str = ".chartlet-seq-box{stroke-width:1.5;stroke-linejoin:round;rx:7px}.chartlet-seq-external{stroke-dasharray:5 3}.chartlet-seq-hit{fill:transparent;stroke:none}.chartlet-seq-actor{stroke:var(--chartlet-text);stroke-width:1.5;stroke-linecap:round}.chartlet-seq-actor-head{fill:var(--chartlet-background);stroke:var(--chartlet-text);stroke-width:1.5}.chartlet-seq-label{font-size:13px;font-weight:600;fill:var(--chartlet-text)}.chartlet-seq-sublabel{font-size:11px;fill:var(--chartlet-muted)}.chartlet-seq-lifeline{stroke:var(--chartlet-zero);stroke-width:1;stroke-dasharray:3 4}.chartlet-seq-activation{fill:var(--chartlet-node);stroke:var(--chartlet-accent);stroke-width:1;rx:2px}.chartlet-seq-message{fill:none;stroke:var(--chartlet-zero);stroke-width:1.4;stroke-linejoin:round}.chartlet-seq-reply{stroke-dasharray:5 4}.chartlet-seq-head{fill:var(--chartlet-zero);stroke:var(--chartlet-zero);stroke-width:1;stroke-linejoin:round}.chartlet-seq-head-open{fill:none;stroke:var(--chartlet-zero);stroke-width:1.4;stroke-linecap:round;stroke-linejoin:round}.chartlet-seq-frame{fill:none;stroke:var(--chartlet-zero);stroke-width:1;rx:6px}.chartlet-seq-tab{fill:var(--chartlet-node);stroke:var(--chartlet-zero);stroke-width:1;rx:4px}.chartlet-seq-tag{font-size:11px;font-weight:650;fill:var(--chartlet-text)}.chartlet-seq-guard{font-size:11px;fill:var(--chartlet-muted);paint-order:stroke;stroke:var(--chartlet-background);stroke-width:3px;stroke-linejoin:round}.chartlet-seq-branch{stroke:var(--chartlet-zero);stroke-width:1;stroke-dasharray:5 4}";
/// Flow charts, on top of [`DIAGRAM_STYLE`]: `--chartlet-lane` fills every other lane, and the
/// main path is drawn in the accent color and thicker, so that it stands out by weight as well as
/// by color.
const FLOW_STYLE: &str = ".chartlet-flow-node{stroke-width:1.5;stroke-linejoin:round;rx:7px}.chartlet-flow-start{stroke-width:2}.chartlet-flow-end{stroke-width:3}.chartlet-flow-external{stroke-dasharray:5 3}.chartlet-flow-inner{stroke:var(--chartlet-role-blue);stroke-width:1}.chartlet-flow-label{font-size:13px;font-weight:600;fill:var(--chartlet-text)}.chartlet-flow-sublabel{font-size:11px;fill:var(--chartlet-muted)}.chartlet-flow-edge{fill:none;stroke:var(--chartlet-zero);stroke-width:1.4;stroke-linejoin:round}.chartlet-flow-dashed{stroke-dasharray:5 4}.chartlet-flow-dotted{stroke-dasharray:1 4;stroke-linecap:round}.chartlet-flow-main{stroke:var(--chartlet-accent);stroke-width:2.2}.chartlet-flow-head{fill:var(--chartlet-zero);stroke:var(--chartlet-zero);stroke-width:1;stroke-linejoin:round}.chartlet-flow-main-head{fill:var(--chartlet-accent);stroke:var(--chartlet-accent)}.chartlet-flow-lane{fill:var(--chartlet-lane);stroke:var(--chartlet-grid);stroke-width:1}.chartlet-flow-lane-alt{fill:var(--chartlet-background)}.chartlet-flow-lane-head{fill:var(--chartlet-lane-head);stroke:none}.chartlet-flow-lane-label{font-size:11px;font-weight:650;fill:var(--chartlet-muted);letter-spacing:.04em}.chartlet-flow-group{fill:var(--chartlet-accent);fill-opacity:.04;stroke:var(--chartlet-zero);stroke-width:1;stroke-dasharray:4 3;rx:10px}.chartlet-flow-group-label{font-size:11px;font-weight:600;fill:var(--chartlet-muted)}";
/// Weighted edges of flow charts and architecture diagrams: one width per step of
/// [`crate::flow::WEIGHT_STEPS`], half a pixel apart, from 1 px to 5 px.
const WEIGHT_STYLE: &str = ".chartlet-flow-w0 .chartlet-flow-edge{stroke-width:1}.chartlet-flow-w1 .chartlet-flow-edge{stroke-width:1.5}.chartlet-flow-w2 .chartlet-flow-edge{stroke-width:2}.chartlet-flow-w3 .chartlet-flow-edge{stroke-width:2.5}.chartlet-flow-w4 .chartlet-flow-edge{stroke-width:3}.chartlet-flow-w5 .chartlet-flow-edge{stroke-width:3.5}.chartlet-flow-w6 .chartlet-flow-edge{stroke-width:4}.chartlet-flow-w7 .chartlet-flow-edge{stroke-width:4.5}.chartlet-flow-w8 .chartlet-flow-edge{stroke-width:5}";
/// Networks, on top of [`DIAGRAM_STYLE`] and [`FLOW_STYLE`]: dots in the color of their group,
/// labels beside them, and the rings around the center.
const NETWORK_STYLE: &str = ".chartlet-root{--chartlet-net-5:#0f766e;--chartlet-net-6:#6d28d9;--chartlet-net-7:#b45309;--chartlet-net-8:#be185d}.chartlet-root.chartlet-theme-dark{--chartlet-net-5:#2dd4bf;--chartlet-net-6:#b69cff;--chartlet-net-7:#fbbf24;--chartlet-net-8:#f472b6}.chartlet-net-node{fill:var(--chartlet-role-blue);stroke:var(--chartlet-background);stroke-width:2}.chartlet-net-g1{fill:var(--chartlet-color-1)}.chartlet-net-g2{fill:var(--chartlet-color-2)}.chartlet-net-g3{fill:var(--chartlet-color-3)}.chartlet-net-g4{fill:var(--chartlet-color-4)}.chartlet-net-g5{fill:var(--chartlet-net-5)}.chartlet-net-g6{fill:var(--chartlet-net-6)}.chartlet-net-g7{fill:var(--chartlet-net-7)}.chartlet-net-g8{fill:var(--chartlet-net-8)}.chartlet-net-center{stroke:var(--chartlet-text)}.chartlet-net-label{font-size:12px;font-weight:600;fill:var(--chartlet-text)}.chartlet-net-ring{fill:none;stroke:var(--chartlet-grid);stroke-width:1;stroke-dasharray:3 4}.chartlet-legend{font-size:12px;fill:var(--chartlet-muted)}";
/// State diagrams, on top of [`DIAGRAM_STYLE`] and [`FLOW_STYLE`]: states with well rounded
/// corners, the inner outline of a final state, and the initial dot.
const STATE_STYLE: &str = ".chartlet-state{rx:14px}.chartlet-state-inner{fill:none;stroke:var(--chartlet-role-green);stroke-width:1.5;rx:11px}.chartlet-state-initial{fill:var(--chartlet-text);stroke:var(--chartlet-background);stroke-width:2}";
/// Architecture diagrams, on top of [`DIAGRAM_STYLE`] and [`FLOW_STYLE`]: the head of a person
/// and the dots of a window bar.
/// Provided and required interfaces of architecture diagrams: the ball, its name, and the socket
/// in the color of its connection's role.
const INTERFACE_STYLE: &str = ".chartlet-arch-ball{fill:var(--chartlet-background);stroke:var(--chartlet-role-blue);stroke-width:1.5}.chartlet-arch-interface{font-size:11px;fill:var(--chartlet-text)}.chartlet-arch-socket{fill:none;stroke:var(--chartlet-zero);stroke-width:1.5;stroke-linecap:round}.chartlet-arch-socket-main{stroke:var(--chartlet-accent)}.chartlet-flow-role-critical .chartlet-arch-socket{stroke:var(--chartlet-role-red)}.chartlet-flow-role-planned .chartlet-arch-socket{stroke:var(--chartlet-role-violet)}.chartlet-flow-role-deprecated .chartlet-arch-socket{stroke:var(--chartlet-role-gray)}";
/// The socket of an interface connection in the color of its category, where the perspective shown
/// gives connections categories.
const INTERFACE_CATEGORY_STYLE: &str = ".chartlet-flow-part-1 .chartlet-arch-socket{stroke:var(--chartlet-color-1)}.chartlet-flow-part-2 .chartlet-arch-socket{stroke:var(--chartlet-color-2)}.chartlet-flow-part-3 .chartlet-arch-socket{stroke:var(--chartlet-color-3)}.chartlet-flow-part-4 .chartlet-arch-socket{stroke:var(--chartlet-color-4)}.chartlet-flow-part-5 .chartlet-arch-socket{stroke:var(--chartlet-part-5)}.chartlet-flow-part-6 .chartlet-arch-socket{stroke:var(--chartlet-part-6)}.chartlet-flow-part-7 .chartlet-arch-socket{stroke:var(--chartlet-part-7)}.chartlet-flow-part-8 .chartlet-arch-socket{stroke:var(--chartlet-part-8)}";
const ARCHITECTURE_STYLE: &str = ".chartlet-arch-head{fill:var(--chartlet-role-violet-fill);stroke:var(--chartlet-role-violet);stroke-width:1.5}.chartlet-arch-dot{fill:var(--chartlet-role-blue);stroke:none}";
const FILTER_STYLE: &str = ".chartlet-wrapper{display:inline-block;max-width:100%}.chartlet-filter{border:none;padding:0;margin:0 0 12px 0}.chartlet-filter legend{font-size:14px;font-weight:650;margin-bottom:4px}.chartlet-filter label{display:inline-flex;align-items:center;min-height:44px;font-size:13px;margin-right:14px;cursor:pointer;white-space:nowrap}.chartlet-filter input{margin-right:4px}.chartlet-filter input:focus-visible{outline:2px solid #2563eb;outline-offset:2px}.chartlet-wrapper:has(.chartlet-filter input.series-0:not(:checked)) .chartlet-root [data-series=\"0\"]{display:none}.chartlet-wrapper:has(.chartlet-filter input.series-1:not(:checked)) .chartlet-root [data-series=\"1\"]{display:none}.chartlet-wrapper:has(.chartlet-filter input.series-2:not(:checked)) .chartlet-root [data-series=\"2\"]{display:none}.chartlet-wrapper:has(.chartlet-filter input.series-3:not(:checked)) .chartlet-root [data-series=\"3\"]{display:none}";
/// Topic map styling. The label and its value stay fully opaque against the filled area, because
/// an opacity below one would take the text under the 4.5:1 contrast the palette is built for;
/// the decorative halo, depth lines and path points are the parts that fade.
///
/// `chartlet-topic-halo`'s stroke width is mirrored by `HALO_WIDTH` in the layout, which keeps
/// that much room free at the canvas edge.
///
/// `--chartlet-sea` is declared here rather than in the shared palette: only a topic map paints
/// a sea, and adding the property to every chart would change the bytes of all of them.
const TOPICMAP_STYLE: &str = ".chartlet-root{--chartlet-sea:#f2efe8;--chartlet-quiet:#fff}.chartlet-theme-dark{--chartlet-sea:#131a24;--chartlet-quiet:#1e2836}.chartlet-sea{fill:var(--chartlet-sea)}.chartlet-graticule{stroke:var(--chartlet-grid);stroke-width:1;opacity:.7}.chartlet-compass-ring{fill:var(--chartlet-background);stroke:var(--chartlet-grid);stroke-width:1}.chartlet-compass-needle{fill:var(--chartlet-muted);opacity:.55}.chartlet-compass-north{fill:var(--chartlet-accent)}.chartlet-compass-label{font-size:11px;font-weight:650;fill:var(--chartlet-muted)}.chartlet-cartouche{fill:var(--chartlet-background);stroke:var(--chartlet-grid);stroke-width:1}.chartlet-cartouche-frame{fill:none;stroke:var(--chartlet-grid);stroke-width:1}.chartlet-cartouche-heading{font-weight:650;fill:var(--chartlet-text)}.chartlet-cartouche-meta{fill:var(--chartlet-muted)}.chartlet-topic-area{fill:var(--chartlet-accent)}.chartlet-topic-halo{fill:none;stroke:var(--chartlet-accent);stroke-width:10;stroke-linejoin:round;opacity:.16}.chartlet-topic-band{fill:none;stroke:var(--chartlet-grid);stroke-width:1;stroke-dasharray:3 6;stroke-linejoin:round}.chartlet-topic-link{fill:none;stroke:var(--chartlet-grid);stroke-width:1.5;stroke-dasharray:4 5;stroke-linecap:round}.chartlet-topic-leader{stroke:var(--chartlet-zero);stroke-width:1}.chartlet-topic-point{fill:var(--chartlet-background);opacity:.6}.chartlet-topic-label{font-weight:650;fill:var(--chartlet-background)}.chartlet-topic-value{fill:var(--chartlet-background)}.chartlet-topic-outside{font-weight:650;fill:var(--chartlet-text)}.chartlet-topic-outside-value{fill:var(--chartlet-muted)}";
/// The landscape. It shares the sea, the graticule and the cartouche with the topic map, and adds
/// only what a nested map needs of its own.
const ATLAS_STYLE: &str = ".chartlet-root{--chartlet-sea:#f2efe8;--chartlet-quiet:#fff}.chartlet-sea{fill:var(--chartlet-sea)}.chartlet-theme-dark{--chartlet-sea:#131a24;--chartlet-quiet:#1e2836}[class^='chartlet-atlas-realm-']{fill:var(--chartlet-quiet);stroke:var(--chartlet-grid);stroke-width:1.2;stroke-linejoin:round}.chartlet-atlas-realm-1{opacity:.94}.chartlet-atlas-realm-2{opacity:.88}.chartlet-atlas-realm-3{opacity:.82}.chartlet-atlas-realm-4{opacity:.76}.chartlet-atlas-realm-5{opacity:.7}.chartlet-atlas-realm-6{opacity:.64}.chartlet-atlas-realm-7{opacity:.58}.chartlet-atlas-place{fill:var(--chartlet-text);opacity:.5}.chartlet-atlas-contour{fill:none;stroke:var(--chartlet-grid);stroke-width:.55;stroke-linejoin:round;opacity:.5}.chartlet-atlas-region{fill:none;stroke:var(--chartlet-grid);stroke-width:.8;stroke-linejoin:round;opacity:.75}.chartlet-atlas-coast{fill:none;stroke:var(--chartlet-accent);stroke-width:1.6;stroke-linejoin:round;opacity:.55}.chartlet-atlas-label{font-weight:650;fill:var(--chartlet-text)}.chartlet-atlas-realm-label{font-weight:650;fill:var(--chartlet-muted);letter-spacing:.08em;opacity:.55}";
/// The class by which the shared stylesheet addresses a chart type.
pub(super) fn type_class(chart_type: ChartType) -> String {
format!("chartlet-type-{}", crate::spec::type_name(chart_type))
}
/// The stylesheets of the diagram types: what they share, then what each adds.
fn diagram_style(chart_type: ChartType) -> String {
let parts: &[&str] = match chart_type {
ChartType::Sequence => &[DIAGRAM_STYLE, SEQUENCE_STYLE],
ChartType::Flow => &[DIAGRAM_STYLE, FLOW_STYLE],
ChartType::State => &[DIAGRAM_STYLE, FLOW_STYLE, STATE_STYLE],
ChartType::Classes => &[DIAGRAM_STYLE, FLOW_STYLE, CLASSES_STYLE],
ChartType::Network => &[DIAGRAM_STYLE, FLOW_STYLE, NETWORK_STYLE],
ChartType::Architecture | ChartType::Tree => {
&[DIAGRAM_STYLE, FLOW_STYLE, ARCHITECTURE_STYLE]
}
_ => &[],
};
parts.concat()
}
/// The style of the chart types that have a style group of their own and need nothing else.
const fn type_style(chart_type: ChartType) -> &'static str {
match chart_type {
ChartType::Boxplot => BOXPLOT_STYLE,
ChartType::Timeline => TIMELINE_STYLE,
ChartType::Waterfall => WATERFALL_STYLE,
ChartType::Waffle => WAFFLE_STYLE,
ChartType::Parliament => PARLIAMENT_STYLE,
ChartType::Treemap => TREEMAP_STYLE,
ChartType::Sankey => SANKEY_STYLE,
ChartType::Survival => SURVIVAL_STYLE,
ChartType::Scatter => SCATTER_STYLE,
_ => "",
}
}
/// The style groups a chart uses, in the order of [`shared_stylesheet`], so that rules cascade
/// alike in a chart's own stylesheet and in the shared one. The print variant has no series
/// filter to style.
#[allow(clippy::too_many_lines)]
pub(super) fn base_style(spec: &ChartSpec, print: bool) -> String {
let has_series = spec.series.len() > 1 || spec.data_groups().len() > 1;
let is_time = matches!(spec.chart_type, ChartType::Time | ChartType::Multiples)
&& !spec.is_bar_multiples();
// A categorical line chart with several series draws its lines in the palette and patterns of
// a time chart's lines.
let several_lines = spec.chart_type == ChartType::Line && has_series;
let is_multiples = spec.chart_type == ChartType::Multiples;
let is_diverging = matches!(spec.chart_type, ChartType::Stripes | ChartType::Calendar);
let is_calendar = spec.chart_type == ChartType::Calendar;
let is_rangebar = spec.chart_type == ChartType::Rangebar;
let is_topicmap = spec.chart_type == ChartType::Topicmap;
let is_atlas = spec.chart_type == ChartType::Atlas;
let is_dark = matches!(spec.theme, Theme::Dark | Theme::Blueprint);
let diagram = diagram_style(spec.chart_type);
let roles = if spec.has_roles() {
crate::roles::style(spec.chart_type)
} else {
String::new()
};
// The groups in their order; a group that does not apply is left out.
[
STYLE,
when(is_dark, DARK_STYLE),
when(has_series, SERIES_STYLE),
when(has_series && !print, FILTER_STYLE),
when(is_time || several_lines, LINE_SERIES_STYLE),
when(
(is_time && needs_layer_extras(spec)) || several_lines,
LAYER_EXTRA_STYLE,
),
when(
(is_time && needs_mark_extras(spec)) || several_lines,
MARK_EXTRA_STYLE,
),
when(
is_time && spec.layers().any(|layer| layer.stroke == Stroke::Medium),
MEDIUM_LINE_STYLE,
),
when(
is_time && needs_annotation_extras(spec),
ANNOTATION_EXTRA_STYLE,
),
when(is_multiples, MULTIPLES_STYLE),
when(
is_multiples && spec.panes.iter().any(|pane| pane.note.is_some()),
PANEL_NOTE_STYLE,
),
when(is_diverging, crate::diverging::STYLE),
when(is_calendar, CALENDAR_STYLE),
when(is_rangebar, RANGEBAR_STYLE),
type_style(spec.chart_type),
when(spec.has_error_bars(), ERROR_STYLE),
when(
is_rangebar && spec.ranges.iter().any(|range| range.group.is_some()),
RANGE_GROUP_STYLE,
),
when(!spec.references.is_empty(), REFERENCE_STYLE),
when(spec.patterns, OUTLINE_STYLE),
when(spec.width < crate::layout::NARROW, SMALL_TITLE_STYLE),
when(is_topicmap, TOPICMAP_STYLE),
when(is_atlas, ATLAS_STYLE),
&diagram,
// Before the roles: a role keeps its color on a connection in a category.
when(
spec.has_connection_categories(),
crate::parts::CONNECTION_STYLE,
),
&roles,
when(spec.has_edge_weights(), WEIGHT_STYLE),
when(spec.has_node_values(), crate::heat::STYLE),
when(
spec.has_node_parts() || spec.has_perspective(),
crate::parts::STYLE,
),
when(spec.has_perspective(), crate::parts::UNSTATED_STYLE),
when(spec.has_component_symbols(), crate::symbols::STYLE),
when(spec.has_interfaces(), INTERFACE_STYLE),
when(
spec.has_interfaces() && spec.has_connection_categories(),
INTERFACE_CATEGORY_STYLE,
),
when(spec.theme == Theme::Blueprint, BLUEPRINT_STYLE),
when(
is_time && spec.layers().any(|layer| layer.mark == Mark::Ohlc),
OHLC_STYLE,
),
]
.concat()
}
/// `style` where `condition` holds, nothing otherwise.
const fn when(condition: bool, style: &str) -> &str {
if condition { style } else { "" }
}
/// Every style group for each of `chart_types` that can use it, in the order of [`base_style`].
/// The light palette and the dark theme apply to every chart; every other group is scoped to the
/// chart types that use it, so that two groups styling the same class, such as the hatching of a
/// time chart and of a range bar chart, never meet.
/// The shared stylesheet: with `common`, first the part every chart relies on, then the part of
/// each of `chart_types` in their order. A type's part styles only charts of that type, so the
/// parts of two types never style the same element and may be concatenated in any order.
pub(crate) fn shared_stylesheet(chart_types: &[ChartType], common: bool) -> String {
use ChartType::{
Architecture, Atlas, Bar, Boxplot, Calendar, Classes, Flow, Line, Multiples, Network,
Parliament, Rangebar, Sankey, Scatter, Sequence, State, Stripes, Survival, Time, Timeline,
Topicmap, Tree, Treemap, Waffle, Waterfall,
};
let groups: &[(&str, &[ChartType])] = &[
(STYLE, &[]),
(DARK_STYLE, &[]),
(SMALL_TITLE_STYLE, &[]),
(SERIES_STYLE, &[Bar]),
(FILTER_STYLE, &[Bar]),
(LINE_SERIES_STYLE, &[Line, Time, Multiples]),
(LAYER_EXTRA_STYLE, &[Line, Time, Multiples]),
(MARK_EXTRA_STYLE, &[Line, Time, Multiples]),
(MEDIUM_LINE_STYLE, &[Time, Multiples]),
(ANNOTATION_EXTRA_STYLE, &[Time, Multiples]),
(MULTIPLES_STYLE, &[Multiples]),
(PANEL_NOTE_STYLE, &[Multiples]),
(crate::diverging::STYLE, &[Stripes, Calendar]),
(CALENDAR_STYLE, &[Calendar]),
(RANGEBAR_STYLE, &[Rangebar]),
(BOXPLOT_STYLE, &[Boxplot]),
(TIMELINE_STYLE, &[Timeline]),
(ERROR_STYLE, &[Bar]),
(RANGE_GROUP_STYLE, &[Rangebar]),
(REFERENCE_STYLE, &[Bar, Rangebar]),
(OUTLINE_STYLE, &[Bar]),
(TOPICMAP_STYLE, &[Topicmap]),
(ATLAS_STYLE, &[Atlas]),
(
DIAGRAM_STYLE,
&[Sequence, Flow, State, Architecture, Tree, Classes, Network],
),
(SEQUENCE_STYLE, &[Sequence]),
(
FLOW_STYLE,
&[Flow, State, Architecture, Tree, Classes, Network],
),
(STATE_STYLE, &[State]),
(CLASSES_STYLE, &[Classes]),
(ARCHITECTURE_STYLE, &[Architecture, Tree]),
(crate::parts::CONNECTION_STYLE, &[Architecture]),
crate::roles::STYLE_GROUPS[0],
crate::roles::STYLE_GROUPS[1],
crate::roles::STYLE_GROUPS[2],
(WEIGHT_STYLE, &[Flow, Architecture, Network]),
(NETWORK_STYLE, &[Network]),
(crate::heat::STYLE, &[Flow, Tree]),
(crate::parts::STYLE, &[Flow, Tree, Architecture]),
(crate::parts::UNSTATED_STYLE, &[Architecture]),
(crate::symbols::STYLE, &[Architecture]),
(INTERFACE_STYLE, &[Architecture]),
(INTERFACE_CATEGORY_STYLE, &[Architecture]),
(
BLUEPRINT_STYLE,
&[Sequence, Flow, State, Architecture, Tree, Classes, Network],
),
(WATERFALL_STYLE, &[Waterfall]),
(WAFFLE_STYLE, &[Waffle]),
(PARLIAMENT_STYLE, &[Parliament]),
(TREEMAP_STYLE, &[Treemap]),
(SANKEY_STYLE, &[Sankey]),
(SURVIVAL_STYLE, &[Survival]),
(SCATTER_STYLE, &[Scatter]),
(OHLC_STYLE, &[Time]),
];
let mut stylesheet = String::new();
// An empty list of types: the group applies to every chart.
if common {
for (group, _) in groups.iter().filter(|(_, types)| types.is_empty()) {
stylesheet.push_str(&scope_stylesheet(group, ".chartlet-root", false));
}
}
for (index, chart_type) in chart_types.iter().enumerate() {
if chart_types[..index].contains(chart_type) {
continue;
}
let scope = format!(".{}", type_class(*chart_type));
for (group, _) in groups
.iter()
.filter(|(_, types)| types.contains(chart_type))
{
stylesheet.push_str(&scope_stylesheet(group, &scope, false));
}
}
stylesheet
}
/// The stylesheet of the print variant. Renderers outside the browser, such as those of print and
/// PDF pipelines, often support class selectors in `<style>` but not CSS custom properties, and
/// would draw every mark that takes its color from one in black or not at all. This resolves
/// every `var()` to the value the chart's theme gives it, and a color declared as a variable to
/// its fallback, the chart's text color, and drops the declarations of the custom properties,
/// together with the rules left empty by that. The attribute selector for the realms of a
/// landscape, which resvg does not match, is written out as the classes it matches.
pub(super) fn print_stylesheet(stylesheet: &str, (is_dark, is_blueprint): (bool, bool)) -> String {
let realms = crate::layout::REALM_CLASSES
.iter()
.chain(&["chartlet-atlas-realm-label"])
.map(|class| format!(".{class}"))
.collect::<Vec<_>>()
.join(",");
// Renderers outside the browser read font weights in hundreds only and would draw 650 as
// regular.
let stylesheet = &stylesheet
.replace("[class^='chartlet-atlas-realm-']", &realms)
.replace("font-weight:650", "font-weight:600");
let mut properties: Vec<(&str, &str)> = Vec::new();
for rule in stylesheet.split_inclusive('}') {
let Some((selector, body)) = rule.split_once('{') else {
continue;
};
if selector != ".chartlet-root"
&& !(is_dark && selector == ".chartlet-theme-dark")
&& !(is_blueprint && selector == ".chartlet-blueprint")
{
continue;
}
for declaration in body.trim_end_matches('}').split(';') {
if let Some((name, value)) = declaration.split_once(':')
&& name.starts_with("--")
{
properties.retain(|(known, _)| *known != name);
properties.push((name, value));
}
}
}
let lookup = |name: &str| {
properties
.iter()
.find(|(known, _)| *known == name)
.map(|(_, value)| *value)
};
let mut resolved = String::with_capacity(stylesheet.len());
for rule in stylesheet.split_inclusive('}') {
let Some((selector, body)) = rule.split_once('{') else {
resolved.push_str(rule);
continue;
};
let declarations: Vec<String> = body
.trim_end_matches('}')
.split(';')
.filter(|declaration| !declaration.starts_with("--"))
.map(|declaration| resolve_variables(declaration, &lookup))
.collect();
if declarations.is_empty() {
continue;
}
write!(resolved, "{selector}{{{}}}", declarations.join(";"))
.expect("writing to String cannot fail");
}
resolved
}
/// Replaces every `var(--name)` and `var(--name,fallback)` in a declaration by the value of the
/// property, or by its fallback when the chart does not define it; `currentColor` as a fallback
/// becomes the chart's text color.
fn resolve_variables<'a>(declaration: &str, lookup: &impl Fn(&str) -> Option<&'a str>) -> String {
let mut output = String::new();
let mut rest = declaration;
while let Some(start) = rest.find("var(") {
output.push_str(&rest[..start]);
let end = start + rest[start..].find(')').expect("a var() is closed");
let (name, fallback) = match rest[start + 4..end].split_once(',') {
Some((name, fallback)) => (name, Some(fallback)),
None => (&rest[start + 4..end], None),
};
let value = lookup(name)
.or_else(|| match fallback {
Some("currentColor") => lookup("--chartlet-text"),
fallback => fallback,
})
.expect("every custom property chartlet uses is defined or has a fallback");
output.push_str(value);
rest = &rest[end + 1..];
}
output.push_str(rest);
output
}
/// Scopes a chart's stylesheet to its root element. An inline SVG's stylesheet applies to the
/// whole page, so without this a later chart's rule such as `.chartlet-line` would recolor the
/// series of an earlier one. Rules that only style the root keep their low specificity, because
/// the `--chartlet-*` custom properties on it are what a host page overrides; the dark theme
/// doubles its class so that a later light chart's defaults cannot win over it. Rules for the
/// HTML controls around the SVG stay as they are. The print variant has no custom properties to
/// override, so its rules on the root are scoped by ID too.
pub(super) fn scope_stylesheet(stylesheet: &str, scope: &str, print: bool) -> String {
let mut scoped = String::with_capacity(stylesheet.len() * 2);
for rule in stylesheet.split_inclusive('}') {
let Some((selectors, body)) = rule.split_once('{') else {
scoped.push_str(rule);
continue;
};
let selectors: Vec<String> = selectors
.split(',')
.map(|selector| scope_selector(selector, scope, print))
.collect();
scoped.push_str(&selectors.join(","));
scoped.push('{');
scoped.push_str(body);
}
scoped
}
fn scope_selector(selector: &str, scope: &str, print: bool) -> String {
const ROOT_CLASSES: [&str; 4] = [
".chartlet-root",
".chartlet-theme-dark",
".chartlet-blueprint",
".chartlet-multiples",
];
if selector.starts_with('#')
|| selector.starts_with(".chartlet-wrapper")
|| selector.starts_with(".chartlet-filter")
{
return selector.to_owned();
}
let on_root = ROOT_CLASSES.iter().any(|class| selector.starts_with(class));
match (on_root, selector.contains(' ')) {
(true, false) if selector == ".chartlet-theme-dark" => {
".chartlet-root.chartlet-theme-dark".to_owned()
}
(true, false) if selector == ".chartlet-blueprint" => {
".chartlet-root.chartlet-blueprint".to_owned()
}
(true, false) if print => format!("{scope}{selector}"),
(true, false) => selector.to_owned(),
(true, true) => format!("{scope}{selector}"),
(false, _) => format!("{scope} {selector}"),
}
}
/// Whether a time chart uses anything beyond plain lines in the first palette colors.
fn needs_layer_extras(spec: &ChartSpec) -> bool {
spec.chart_type == ChartType::Multiples
|| spec.layers().any(|layer| {
matches!(layer.mark, Mark::Annotation | Mark::Area | Mark::Band)
|| layer.modeled
|| layer.has_band()
})
|| spec.data_layers().any(|entry| {
entry.layer.resolved_color().is_none()
&& (spec.palette_index(entry.layer) > 0 || spec.series_names().len() > 1)
})
}
/// Whether a time chart draws a zone or a point marker.
fn needs_annotation_extras(spec: &ChartSpec) -> bool {
spec.layers()
.any(|layer| layer.mark == Mark::Band || layer.is_marker())
}
/// Whether a time chart draws an area, a line pattern other than solid or the modeled dash, or a
/// bold line.
fn needs_mark_extras(spec: &ChartSpec) -> bool {
spec.layers().any(|layer| {
layer.mark == Mark::Area
|| layer.stroke == Stroke::Bold
|| (layer.is_data()
&& !matches!(
(layer.effective_dash(), layer.modeled),
(Dash::Solid, _) | (Dash::Dashed, true)
))
})
}
/// CSS rules for the colors a time layer declares itself, including the fill of its band. Only colors that passed the contract reach this point, and the contract admits no
/// character that could end a declaration, so the values are safe to interpolate. The rules are
/// scoped to the chart's root ID: an inline SVG's stylesheet applies to the whole page, and two
/// charts would otherwise recolor each other's layers.
pub(super) fn layer_style(spec: &ChartSpec) -> String {
let mut style = String::new();
for (index, layer) in spec.layers().enumerate() {
if let Some(color) = layer.resolved_color() {
let color = crate::color::emit(color);
write!(
style,
".chartlet-style-{index}{{stroke:{color}}}.chartlet-style-{index}-swatch{{fill:{color}}}.chartlet-style-{index}-point{{fill:{color}}}"
)
.expect("writing to String cannot fail");
if layer.has_band() {
write!(
style,
".chartlet-band.chartlet-style-{index}{{fill:{color};stroke:none}}"
)
.expect("writing to String cannot fail");
}
if layer.is_marker() {
write!(
style,
".chartlet-marker.chartlet-style-{index}{{fill:{color};stroke:var(--chartlet-background)}}"
)
.expect("writing to String cannot fail");
}
if layer.mark == Mark::Area {
write!(
style,
".chartlet-area.chartlet-style-{index}{{fill:{color};stroke:none}}"
)
.expect("writing to String cannot fail");
}
}
}
style
}