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theme.ts
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theme.ts
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import {Facet} from "@codemirror/state"
import {StyleModule, StyleSpec} from "style-mod"
export const theme = Facet.define<string, string>({combine: strs => strs.join(" ")})
export const darkTheme = Facet.define<boolean, boolean>({combine: values => values.indexOf(true) > -1})
export const baseThemeID = StyleModule.newName()
function expandThemeClasses(sel: string) {
return sel.replace(/\$\w[\w\.]*/g, cls => {
let parts = cls.slice(1).split("."), result = ""
for (let i = 1; i <= parts.length; i++) result += ".cm-" + parts.slice(0, i).join("-")
return result
})
}
export function buildTheme(main: string, spec: {[name: string]: StyleSpec}) {
return new StyleModule(spec, {
process(sel) {
sel = expandThemeClasses(sel)
return /\$/.test(sel) ? sel.replace(/\$/, main) : main + " " + sel
},
extend(template, sel) {
template = expandThemeClasses(template)
return sel.slice(0, main.length + 1) == main + " "
? main + " " + template.replace(/&/, sel.slice(main.length + 1))
: template.replace(/&/, sel)
}
})
}
/// Create a set of CSS class names for the given theme class, which
/// can be added to a DOM element within an editor to make themes able
/// to style it. Theme classes can be single words or words separated
/// by dot characters. In the latter case, the returned classes
/// combine those that match the full name and those that match some
/// prefix—for example `"panel.search"` will match both the theme
/// styles specified as `"panel.search"` and those with just
/// `"panel"`. More specific theme classes (with more dots) take
/// precedence over less specific ones.
export function themeClass(selector: string): string {
if (selector.indexOf(".") < 0) return "cm-" + selector
let parts = selector.split("."), result = ""
for (let i = 1; i <= parts.length; i++)
result += (result ? " " : "") + "cm-" + parts.slice(0, i).join("-")
return result
}
export const baseTheme = buildTheme("." + baseThemeID, {
$: {
position: "relative !important",
boxSizing: "border-box",
"&$focused": {
// FIXME it would be great if we could directly use the browser's
// default focus outline, but it appears we can't, so this tries to
// approximate that
outline_fallback: "1px dotted #212121",
outline: "5px auto -webkit-focus-ring-color"
},
display: "flex !important",
flexDirection: "column"
},
$scroller: {
display: "flex !important",
alignItems: "flex-start !important",
fontFamily: "monospace",
lineHeight: 1.4,
height: "100%",
overflowX: "auto",
position: "relative",
zIndex: 0
},
$content: {
margin: 0,
flexGrow: 2,
minHeight: "100%",
display: "block",
whiteSpace: "pre",
boxSizing: "border-box",
padding: "4px 0",
outline: "none"
},
"$$light $content": { caretColor: "black" },
"$$dark $content": { caretColor: "white" },
$line: {
display: "block",
padding: "0 2px 0 4px"
},
$selectionLayer: {
zIndex: -1,
contain: "size style"
},
$selectionBackground: {
position: "absolute",
},
"$$light $selectionBackground": {
background: "#d9d9d9"
},
"$$dark $selectionBackground": {
background: "#222"
},
"$$focused$light $selectionBackground": {
background: "#d7d4f0"
},
"$$focused$dark $selectionBackground": {
background: "#233"
},
$cursorLayer: {
zIndex: 100,
contain: "size style",
pointerEvents: "none"
},
"$$focused $cursorLayer": {
animation: "steps(1) cm-blink 1.2s infinite"
},
// Two animations defined so that we can switch between them to
// restart the animation without forcing another style
// recomputation.
"@keyframes cm-blink": {"0%": {}, "50%": {visibility: "hidden"}, "100%": {}},
"@keyframes cm-blink2": {"0%": {}, "50%": {visibility: "hidden"}, "100%": {}},
$cursor: {
position: "absolute",
borderLeft: "1.2px solid black",
marginLeft: "-0.6px",
pointerEvents: "none",
display: "none"
},
"$$dark $cursor": {
borderLeftColor: "#444"
},
"$$focused $cursor": {
display: "block"
},
"$$light $activeLine": { backgroundColor: "#f3f9ff" },
"$$dark $activeLine": { backgroundColor: "#223039" },
"$$light $specialChar": { color: "red" },
"$$dark $specialChar": { color: "#f78" },
"$tab": {
display: "inline-block",
overflow: "hidden",
verticalAlign: "bottom"
},
$placeholder: {
color: "#888",
display: "inline-block"
},
$button: {
verticalAlign: "middle",
color: "inherit",
fontSize: "70%",
padding: ".2em 1em",
borderRadius: "3px"
},
"$$light $button": {
backgroundImage: "linear-gradient(#eff1f5, #d9d9df)",
border: "1px solid #888",
"&:active": {
backgroundImage: "linear-gradient(#b4b4b4, #d0d3d6)"
}
},
"$$dark $button": {
backgroundImage: "linear-gradient(#555, #111)",
border: "1px solid #888",
"&:active": {
backgroundImage: "linear-gradient(#111, #333)"
}
},
$textfield: {
verticalAlign: "middle",
color: "inherit",
fontSize: "70%",
border: "1px solid silver",
padding: ".2em .5em"
},
"$$light $textfield": {
backgroundColor: "white"
},
"$$dark $textfield": {
border: "1px solid #555",
backgroundColor: "inherit"
}
})