import { Image, Linking, type TextStyle, useColorScheme } from "react-native"; import { MarkdownTextPrimitive } from "./MarkdownTextPrimitive";import { markdownFileIconSource } from "./markdownFileIcons";import type { NativeMarkdownTextRun } from "./nativeMarkdownText";import type { NativeMarkdownTextStyle } from "./SelectableMarkdownText.types"; const EXTERNAL_LINK_PREFIX = "◉ ";const INLINE_ATTACHMENT_PREFIX = "\uFFFC\u00A0";const SKILL_ICON_PLACEHOLDER = "\uFFFC";const PARAGRAPH_STYLE_ENCODING_OFFSET = 1000; function runKeySignature(run: NativeMarkdownTextRun): string {  return [    run.text,    run.bold,    run.italic,    run.strikethrough,    run.code,    run.href,    run.externalHost,    run.fileIcon,    run.skillName,    run.skillLabel,    run.role,    run.headingLevel,    run.depth,    run.spacing,    run.firstLineHeadIndent,    run.headIndent,    run.paragraphSpacing,  ].join(":");} function runStyle(run: NativeMarkdownTextRun, textStyle: NativeMarkdownTextStyle): TextStyle {  const isFile = run.fileIcon != null;  const isSkill = run.skillName != null;  const headingLevel = Math.max(1, Math.min(6, run.headingLevel ?? 1));  const headingFontSize = [22, 19, 17, 16, 15, 15][headingLevel - 1] ?? 15;  const isHeading = run.role === "heading";  const isCodeBlock = run.role === "code-block" || run.role === "code-language";  const hasParagraphStyle = run.headIndent !== undefined;  const textDecorationLine = run.strikethrough    ? "line-through"    : run.href && !isFile      ? "underline"      : "none";   return {    color: isFile      ? textStyle.fileTextColor      : isSkill        ? textStyle.skillTextColor        : run.href          ? textStyle.linkColor          : isHeading            ? textStyle.strongColor            : run.role === "quote-marker"              ? textStyle.quoteMarkerColor              : run.role === "divider"                ? textStyle.dividerColor                : run.role === "code-language"                  ? textStyle.mutedColor                  : run.role === "list-marker"                    ? textStyle.mutedColor                    : isCodeBlock                      ? textStyle.codeColor                      : run.code                        ? textStyle.inlineCodeColor                        : run.bold                          ? textStyle.strongColor                          : textStyle.color,    fontFamily:      isFile || isSkill        ? textStyle.boldFontFamily        : run.code || isCodeBlock          ? "ui-monospace"          : isHeading            ? textStyle.headingFontFamily            : run.bold              ? textStyle.boldFontFamily              : textStyle.fontFamily,    fontSize:      run.role === "spacer"        ? (run.spacing ?? 10)        : run.role === "list-break"          ? textStyle.fontSize          : isHeading            ? headingFontSize            : run.role === "code-language"              ? 11              : run.code || isCodeBlock                ? Math.max(12, textStyle.fontSize - 2)                : textStyle.fontSize,    lineHeight:      run.role === "spacer"        ? (run.spacing ?? 10)        : run.role === "list-break"          ? textStyle.lineHeight + (run.spacing ?? 0)          : isHeading            ? Math.max(headingFontSize + 6, 20)            : isCodeBlock              ? 18              : textStyle.lineHeight,    fontStyle: run.italic ? "italic" : "normal",    fontWeight: isHeading || run.bold || isFile || isSkill ? "700" : "400",    textDecorationLine,    backgroundColor: isCodeBlock ? textStyle.codeBlockBackgroundColor : undefined,    ...(hasParagraphStyle      ? {          shadowColor: "transparent",          shadowOffset: {            width: run.firstLineHeadIndent ?? 0,            height: run.headIndent,          },          shadowRadius: PARAGRAPH_STYLE_ENCODING_OFFSET + (run.paragraphSpacing ?? 0),        }      : {}),  };} export function NativeMarkdownSelectableText(props: {  readonly runs: ReadonlyArray<NativeMarkdownTextRun>;  readonly textStyle: NativeMarkdownTextStyle;  readonly onLinkPress?: (href: string) => void;}) {  const colorScheme = useColorScheme();  const occurrences = new Map<string, number>();  const prefixedExternalLinks = new Set<string>();  const keyedRuns = props.runs.map((run) => {    const signature = runKeySignature(run);    const occurrence = occurrences.get(signature) ?? 0;    occurrences.set(signature, occurrence + 1);     let text = run.text;    if (run.fileIcon) {      text = `${INLINE_ATTACHMENT_PREFIX}${text}`;    } else if (run.skillName && run.skillLabel) {      text = `${SKILL_ICON_PLACEHOLDER}\u00A0${run.skillLabel}`;    } else if (run.externalHost && run.href && !prefixedExternalLinks.has(run.href)) {      prefixedExternalLinks.add(run.href);      text = `${EXTERNAL_LINK_PREFIX}${text}`;    }     return { key: `${signature}:${occurrence}`, run, text };  });  // T3MarkdownText only rebuilds its attributed string during native layout. A  // color-only child update can otherwise leave the previous appearance cached.  const appearanceKey = [    colorScheme ?? "unspecified",    props.textStyle.color,    props.textStyle.strongColor,    props.textStyle.mutedColor,    props.textStyle.linkColor,    props.textStyle.inlineCodeColor,    props.textStyle.codeColor,    props.textStyle.codeBackgroundColor,    props.textStyle.codeBlockBackgroundColor,    props.textStyle.fileTextColor,    props.textStyle.skillTextColor,    props.textStyle.quoteMarkerColor,    props.textStyle.dividerColor,  ].join(":");   return (    <MarkdownTextPrimitive      key={appearanceKey}      uiTextView      selectable      style={{        flexShrink: 1,        minWidth: 0,        color: props.textStyle.color,        fontFamily: props.textStyle.fontFamily,        fontSize: props.textStyle.fontSize,        lineHeight: props.textStyle.lineHeight,      }}    >      {keyedRuns.map(({ key, run, text }) => {        const href = run.href;        return (          <MarkdownTextPrimitive            key={key}            nativeID={              run.fileIcon                ? `t3-file:${Image.resolveAssetSource(markdownFileIconSource(run.fileIcon)).uri}`                : run.skillName                  ? "t3-skill:sf:cube"                  : undefined            }            style={runStyle(run, props.textStyle)}            onPress={              href                ? () => {                    if (props.onLinkPress) {                      props.onLinkPress(href);                    } else {                      void Linking.openURL(href);                    }                  }                : undefined            }          >            {text}          </MarkdownTextPrimitive>        );      })}    </MarkdownTextPrimitive>  );}