Press n or j to go to the next uncovered block, b, p or k for the previous block.
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DraftBlockType,
DraftInlineStyleType,
EditorState,
Modifier,
RawDraftContentBlock,
RawDraftContentState,
RawDraftEntity,
convertFromRaw,
genKey,
} from "draft-js";
import { TableData } from "./TableBlock";
// Pasting an authored document (Word / Google Docs / a web page) into the
// legal-document editor must keep the formatting the editor can model: heading
// levels, bold / italic / underline / strikethrough, alignment, lists, links
// and tables. Draft's own paste path runs with `stripPastedStyles`, which
// flattens everything to unstyled text — a Merchant Agreement pasted from Word
// then renders its headings at body size and weight, which is the reported bug.
//
// This module converts clipboard HTML into a RawDraftContentState the editor
// understands; HFRichInput inserts it as a fragment. Anything the editor cannot
// model is deliberately dropped rather than smuggled in as raw CSS — colors,
// font families and absolute font sizes would render as formatting the toolbar
// cannot subsequently change. Font sizes are instead read as *evidence* of
// heading level (see inferHeadings), so the document's structure survives even
// when its author sized the headings by hand instead of using heading styles.
const TEXT_NODE = 3;
const ELEMENT_NODE = 1;
const BOLD: DraftInlineStyleType = "BOLD";
const ITALIC: DraftInlineStyleType = "ITALIC";
const UNDERLINE: DraftInlineStyleType = "UNDERLINE";
const STRIKETHROUGH: DraftInlineStyleType = "STRIKETHROUGH";
// The inline styles the toolbar can toggle. Nothing else is imported.
const STYLE_BY_TAG: Record<string, DraftInlineStyleType> = {
B: BOLD,
STRONG: BOLD,
I: ITALIC,
EM: ITALIC,
CITE: ITALIC,
U: UNDERLINE,
INS: UNDERLINE,
S: STRIKETHROUGH,
STRIKE: STRIKETHROUGH,
DEL: STRIKETHROUGH,
};
const HEADING_BY_TAG: Record<string, DraftBlockType> = {
H1: "header-one",
H2: "header-two",
H3: "header-three",
H4: "header-four",
H5: "header-five",
H6: "header-six",
};
const HEADING_BY_LEVEL: DraftBlockType[] = [
"header-one",
"header-two",
"header-three",
"header-four",
"header-five",
"header-six",
];
// Elements that open and close a block (one Draft block per element).
const BLOCK_TAGS = new Set([
"ADDRESS",
"ARTICLE",
"ASIDE",
"BLOCKQUOTE",
"DD",
"DIV",
"DL",
"DT",
"FIGCAPTION",
"FIGURE",
"FOOTER",
"H1",
"H2",
"H3",
"H4",
"H5",
"H6",
"HEADER",
"HR",
"LI",
"MAIN",
"NAV",
"OL",
"P",
"PRE",
"SECTION",
"UL",
]);
// Non-content elements that turn up in clipboard HTML: Word ships a <style>
// block, VML fallbacks and <o:p> spacers inside the fragment, and embedded
// media has no place in a legal document — it would paste as an atomic block
// the document editor cannot render.
const SKIP_TAGS = new Set([
"AUDIO",
"BUTTON",
"EMBED",
"HEAD",
"IFRAME",
"IMG",
"INPUT",
"LINK",
"META",
"NOSCRIPT",
"OBJECT",
"O:P",
"PICTURE",
"SCRIPT",
"SELECT",
"STYLE",
"SVG",
"TEXTAREA",
"TITLE",
"VIDEO",
]);
// Word can carry absurd colspan values; padding is capped at the same column
// count the insert popover allows.
const MAX_COLSPAN = 10;
// Draft's list nesting cap.
const MAX_LIST_DEPTH = 4;
// A paragraph longer than this is prose, never a heading — the size-based
// inference below refuses to promote it however large its text is set.
const MAX_INFERRED_HEADING_LENGTH = 120;
// The size a relative unit (em / %) resolves against when no ancestor declared
// an absolute one. Only ever used for ratios; never emitted into the document.
const BASE_FONT_SIZE_PX = 16;
const PT_TO_PX = 96 / 72;
// Allow only safe schemes plus relative/anchor links — the same allowlist
// DocumentViewer applies when rendering stored content. Sanitizing here keeps
// a `javascript:` href out of the document in the first place.
const SAFE_URL_SCHEME = /^(https?:|mailto:|tel:)/i;
const sanitizeUrl = (url: string | null): string => {
Iif (!url) return "";
const trimmed = url.trim();
Iif (trimmed.startsWith("/") || trimmed.startsWith("#")) return trimmed;
return SAFE_URL_SCHEME.test(trimmed) ? trimmed : "";
};
// Word / Google Docs / PDF-derived clipboard HTML carries invisible characters
// that change where a line may break: a zero-width space or zero-width joiner
// opens a break opportunity INSIDE a word (the word then renders split across
// two lines with no hyphen), a soft hyphen breaks it with one, and a word
// joiner does the opposite — it welds a run into one unbreakable token that a
// wrapping container has to break at the margin. None of them carry meaning in
// a legal document, so they are dropped rather than pasted in. A no-break space
// becomes an ordinary one (`\s` already covers its U+2007 / U+202F / U+FEFF
// variants; U+00A0 is spelled out because it is the one Word emits everywhere).
const INVISIBLE_BREAK_CHARS = /[\u00ad\u200b\u200c\u200d\u2060]/g;
const collapseWhitespace = (text: string) =>
text
.replace(INVISIBLE_BREAK_CHARS, "")
.replace(/ /g, " ")
.replace(/\s+/g, " ");
/* ------------------------------------------------------------------ *
* Element inspection
* ------------------------------------------------------------------ */
// Read declarations off the style attribute by property name rather than
// through the camelCase accessors: jsdom's CSSStyleDeclaration only implements
// accessors for the properties it knows, but keeps every parsed declaration
// reachable by name — so `getPropertyValue` behaves the same in tests and in
// the browser.
const cssValue = (el: Element, property: string): string =>
((el as HTMLElement).style?.getPropertyValue?.(property) ?? "")
.trim()
.toLowerCase();
/** The inline styles active inside `el`, given those active around it. */
const stylesFor = (
el: Element,
inherited: DraftInlineStyleType[],
): DraftInlineStyleType[] => {
const styles = new Set<DraftInlineStyleType>(inherited);
const tagStyle = STYLE_BY_TAG[el.tagName];
if (tagStyle) styles.add(tagStyle);
// Word writes emphasis back out as CSS as often as it does as a tag, and
// writes `normal` to *cancel* an inherited one (a non-bold run inside a bold
// heading), so both directions have to be honoured.
const weight = cssValue(el, "font-weight");
if (weight) {
const numeric = parseInt(weight, 10);
if (weight === "bold" || weight === "bolder" || numeric >= 600) {
styles.add(BOLD);
} else Eif (weight === "normal" || weight === "lighter" || numeric) {
styles.delete(BOLD);
}
}
const fontStyle = cssValue(el, "font-style");
Iif (fontStyle === "italic" || fontStyle === "oblique") {
styles.add(ITALIC);
} else Iif (fontStyle === "normal") {
styles.delete(ITALIC);
}
const decoration = `${cssValue(el, "text-decoration")} ${cssValue(
el,
"text-decoration-line",
)}`;
Iif (decoration.includes("none")) {
styles.delete(UNDERLINE);
styles.delete(STRIKETHROUGH);
}
if (decoration.includes("underline")) styles.add(UNDERLINE);
Iif (decoration.includes("line-through")) styles.add(STRIKETHROUGH);
return Array.from(styles);
};
/** `el`'s font size in px, or the inherited one when it declares none. */
const fontSizeOf = (el: Element, inherited?: number): number | undefined => {
const value = cssValue(el, "font-size");
if (!value) return inherited;
const match = /^([\d.]+)\s*(pt|px|em|rem|%)?$/.exec(value);
Iif (!match) return inherited;
const size = parseFloat(match[1]);
Iif (!isFinite(size) || size <= 0) return inherited;
const relativeTo = inherited || BASE_FONT_SIZE_PX;
switch (match[2]) {
case "pt":
return size * PT_TO_PX;
case "em":
case "rem":
return size * relativeTo;
case "%":
return (size / 100) * relativeTo;
default:
return size;
}
};
const ALIGNMENTS = new Set(["left", "center", "right"]);
const alignOf = (el: Element): string | undefined => {
const value =
cssValue(el, "text-align") ||
(el.getAttribute("align") ?? "").trim().toLowerCase();
return ALIGNMENTS.has(value) ? value : undefined;
};
/**
* The heading level `el` represents, if any. Real heading elements come first;
* Word also emits its built-in heading styles as a plain paragraph carrying
* `mso-outline-level` or an `MsoHeading*` / `MsoTitle` class, which reads as a
* heading to everyone except the HTML parser.
*/
const headingTypeOf = (el: Element): DraftBlockType | undefined => {
const byTag = HEADING_BY_TAG[el.tagName];
if (byTag) return byTag;
const outline = /mso-outline-level:\s*(\d)/i.exec(
el.getAttribute("style") ?? "",
);
if (outline) return HEADING_BY_LEVEL[Number(outline[1]) - 1];
const className = el.getAttribute("class") ?? "";
if (/\bMsoTitle\b/i.test(className)) return "header-one";
Iif (/\bMsoSubtitle\b/i.test(className)) return "header-two";
const msoHeading = /\bMsoHeading(\d)\b/i.exec(className);
if (msoHeading) return HEADING_BY_LEVEL[Number(msoHeading[1]) - 1];
return undefined;
};
/* ------------------------------------------------------------------ *
* Tables — same { columns, rows } entity contract as TableBlock's insert
* ------------------------------------------------------------------ */
// textContent with HTML whitespace semantics: runs of whitespace collapse,
// <br> and block elements become newlines.
const textFromNode = (node: Node): string => {
if (node.nodeType === TEXT_NODE) {
return collapseWhitespace(node.textContent ?? "");
}
Iif (node.nodeType !== ELEMENT_NODE) return "";
const el = node as Element;
Iif (SKIP_TAGS.has(el.tagName)) return "";
if (el.tagName === "BR") return "\n";
const inner = Array.from(el.childNodes).map(textFromNode).join("");
return BLOCK_TAGS.has(el.tagName) || el.tagName === "TR"
? `\n${inner}\n`
: inner;
};
// Trim each line, collapse blank runs, drop leading/trailing empties.
const cleanMultiline = (raw: string): string =>
raw
.split("\n")
.map((line) => line.trim())
.join("\n")
.replace(/\n{2,}/g, "\n")
.trim();
const parseTable = (table: Element): TableData | null => {
// closest() filter keeps rows of nested tables out of the outer table's
// grid (the nested table is flattened into its host cell's text).
const rowEls = Array.from(table.querySelectorAll("tr")).filter(
(tr) => tr.closest("table") === table,
);
const grid: string[][] = [];
for (const tr of rowEls) {
const cells: string[] = [];
for (const cell of Array.from(tr.children)) {
Iif (cell.tagName !== "TD" && cell.tagName !== "TH") continue;
cells.push(cleanMultiline(textFromNode(cell)));
// Pad merged cells so later rows keep their column alignment.
const colSpan = Math.min(
parseInt(cell.getAttribute("colspan") ?? "1", 10) || 1,
MAX_COLSPAN,
);
for (let i = 1; i < colSpan; i += 1) cells.push("");
}
Eif (cells.length) grid.push(cells);
}
Iif (!grid.length) return null;
// Ragged rows (rowspan remainders, malformed markup) are padded to the
// widest row so the TableData grid stays rectangular.
const width = Math.max(...grid.map((row) => row.length));
const padded = grid.map((row) => [
...row,
...Array.from({ length: width - row.length }, () => ""),
]);
// TableData renders `columns` as the header row; the pasted table's first
// row takes that role, matching how the table looked at its source.
const [columns, ...rows] = padded;
return { columns, rows };
};
/* ------------------------------------------------------------------ *
* HTML → blocks
* ------------------------------------------------------------------ */
type PastedRange = { offset: number; length: number };
type PastedBlock = {
type: DraftBlockType;
depth: number;
text: string;
align?: string;
styleRanges: (PastedRange & { style: DraftInlineStyleType })[];
entityRanges: (PastedRange & { key: number })[];
/** px font size → characters set in it. Feeds heading inference only. */
sizes: Map<number, number>;
};
type WalkContext = {
styles: DraftInlineStyleType[];
linkKey?: number;
fontSize?: number;
blockType: DraftBlockType;
depth: number;
align?: string;
listType?: DraftBlockType;
listDepth: number;
};
const trimTrailing = (block: PastedBlock): PastedBlock => {
const text = block.text.replace(/\s+$/, "");
if (text.length === block.text.length) return block;
const clamp = <T extends PastedRange>(range: T): T => ({
...range,
length: Math.min(range.length, text.length - range.offset),
});
return {
...block,
text,
styleRanges: block.styleRanges
.filter((range) => range.offset < text.length)
.map(clamp),
entityRanges: block.entityRanges
.filter((range) => range.offset < text.length)
.map(clamp),
};
};
/**
* The most-used font size within a block, or undefined when the source
* declared none. Ties resolve to the larger size — a heading is rarely the
* smaller half of a tie.
*/
const dominantSize = (block: PastedBlock): number | undefined => {
let best: number | undefined;
let bestCount = 0;
block.sizes.forEach((count, size) => {
Eif (count > bestCount || (count === bestCount && size > (best ?? 0))) {
best = size;
bestCount = count;
}
});
return best;
};
/**
* Promotes short paragraphs set noticeably larger than the body to headings.
*
* Only runs when the source carried no heading markup at all: a document whose
* author used Word's heading styles needs no guessing, while one whose author
* only made the titles bigger would otherwise paste completely flat — the
* reported bug. The ratios are deliberately conservative, and a document that
* declares no font sizes at all (plain HTML) is left alone.
*/
const inferHeadings = (blocks: PastedBlock[]): void => {
if (blocks.some((block) => block.type.startsWith("header-"))) return;
const totals = new Map<number, number>();
blocks.forEach((block) =>
block.sizes.forEach((count, size) =>
totals.set(size, (totals.get(size) ?? 0) + count),
),
);
if (!totals.size) return;
// Body size = the size most of the document's characters are set in.
let bodySize = 0;
let bodyCount = 0;
totals.forEach((count, size) => {
if (count > bodyCount) {
bodySize = size;
bodyCount = count;
}
});
Iif (!bodySize) return;
blocks.forEach((block) => {
Iif (block.type !== "unstyled") return;
Iif (block.text.length > MAX_INFERRED_HEADING_LENGTH) return;
const size = dominantSize(block);
Iif (!size) return;
const ratio = size / bodySize;
if (ratio >= 1.5) block.type = "header-one";
else if (ratio >= 1.25) block.type = "header-two";
else Iif (ratio >= 1.1) block.type = "header-three";
});
};
type ParseResult = {
blocks: PastedBlock[];
entities: RawDraftEntity[];
};
const emptyParagraph = (): PastedBlock => ({
type: "unstyled",
depth: 0,
text: "",
styleRanges: [],
entityRanges: [],
sizes: new Map(),
});
const parseBody = (body: HTMLElement, allowTables: boolean): ParseResult => {
const blocks: PastedBlock[] = [];
const entities: RawDraftEntity[] = [];
let current: PastedBlock | null = null;
const flush = () => {
if (!current) return;
const block = trimTrailing(current);
current = null;
Eif (block.text) blocks.push(block);
};
const append = (text: string, ctx: WalkContext) => {
Iif (!text) return;
// Whitespace between two block elements must not open a block of its own.
if (!current && !text.trim()) return;
if (!current) {
current = {
type: ctx.blockType,
depth: ctx.depth,
align: ctx.align,
text: "",
styleRanges: [],
entityRanges: [],
sizes: new Map(),
};
}
const block = current;
const offset = block.text.length;
block.text += text;
ctx.styles.forEach((style) =>
block.styleRanges.push({ offset, length: text.length, style }),
);
if (ctx.linkKey !== undefined) {
block.entityRanges.push({
offset,
length: text.length,
key: ctx.linkKey,
});
}
if (ctx.fontSize) {
const weight = text.trim().length;
Eif (weight) {
block.sizes.set(
ctx.fontSize,
(block.sizes.get(ctx.fontSize) ?? 0) + weight,
);
}
}
};
const appendTable = (data: TableData, ctx: WalkContext) => {
flush();
if (!allowTables) {
// Editors without the table control still get the cell text, one block
// per row — the shape the plain-text paste produced.
[data.columns, ...data.rows].forEach((row) => {
append(row.filter(Boolean).join(" "), ctx);
flush();
});
return;
}
entities.push({ type: "TABLE", mutability: "IMMUTABLE", data });
blocks.push({
type: "atomic",
depth: 0,
text: " ",
styleRanges: [],
entityRanges: [{ offset: 0, length: 1, key: entities.length - 1 }],
sizes: new Map(),
});
};
const walk = (node: Node, ctx: WalkContext) => {
if (node.nodeType === TEXT_NODE) {
append(collapseWhitespace(node.textContent ?? ""), ctx);
return;
}
Iif (node.nodeType !== ELEMENT_NODE) return;
const el = node as Element;
if (SKIP_TAGS.has(el.tagName)) return;
if (el.tagName === "TABLE") {
const data = parseTable(el);
Eif (data) appendTable(data, ctx);
return;
}
// A line break ends the block; the next text reopens one of the same type.
if (el.tagName === "BR") {
flush();
return;
}
const heading = headingTypeOf(el);
const childCtx: WalkContext = {
...ctx,
styles: stylesFor(el, ctx.styles),
fontSize: fontSizeOf(el, ctx.fontSize),
align: alignOf(el) ?? ctx.align,
};
if (el.tagName === "A") {
const url = sanitizeUrl(el.getAttribute("href"));
if (url) {
entities.push({
type: "LINK",
mutability: "MUTABLE",
data: {
url,
targetOption:
el.getAttribute("target") === "_blank" ? "_blank" : "_self",
},
});
childCtx.linkKey = entities.length - 1;
}
}
if (el.tagName === "UL" || el.tagName === "OL") {
childCtx.listType =
el.tagName === "OL" ? "ordered-list-item" : "unordered-list-item";
childCtx.listDepth = ctx.listDepth + 1;
} else if (el.tagName === "LI") {
childCtx.blockType = ctx.listType ?? "unordered-list-item";
childCtx.depth = Math.min(Math.max(ctx.listDepth - 1, 0), MAX_LIST_DEPTH);
} else if (heading) {
childCtx.blockType = heading;
childCtx.depth = 0;
} else if (BLOCK_TAGS.has(el.tagName)) {
// Google Docs wraps each list item's text in its own <p>. That opens a
// block, but it must stay the list item it sits in or the bullet is lost.
const inListItem =
ctx.blockType === "ordered-list-item" ||
ctx.blockType === "unordered-list-item";
if (!inListItem) {
childCtx.blockType = "unstyled";
childCtx.depth = 0;
}
}
const isBlock = BLOCK_TAGS.has(el.tagName) || heading !== undefined;
if (isBlock) flush();
Array.from(el.childNodes).forEach((child) => walk(child, childCtx));
if (isBlock) flush();
};
Array.from(body.childNodes).forEach((child) =>
walk(child, {
styles: [],
blockType: "unstyled",
depth: 0,
listDepth: 0,
}),
);
flush();
inferHeadings(blocks);
return { blocks, entities };
};
const toRawContent = ({
blocks,
entities,
}: ParseResult): RawDraftContentState | null => {
if (!blocks.length) return null;
const entityMap: Record<string, RawDraftEntity> = {};
entities.forEach((entity, index) => {
entityMap[String(index)] = entity;
});
// Draft merges a fragment's first and last blocks into the blocks either
// side of the caret, which an atomic block cannot survive: it would be
// folded into a text block as a lone space carrying the TABLE entity. Pad
// the fragment with an empty paragraph on any edge that holds one, so the
// table always lands as a block of its own (the same padding
// AtomicBlockUtils.insertAtomicBlock applies).
const padded = [...blocks];
if (padded[0].type === "atomic") padded.unshift(emptyParagraph());
if (padded[padded.length - 1].type === "atomic") {
padded.push(emptyParagraph());
}
const rawBlocks: RawDraftContentBlock[] = padded.map((block) => ({
key: genKey(),
type: block.type,
text: block.text,
depth: block.depth,
inlineStyleRanges: block.styleRanges,
entityRanges: block.entityRanges,
// The block-data key the Alignment control writes (blockStyle.ts).
data: block.align ? { "text-align": block.align } : {},
}));
return { blocks: rawBlocks, entityMap };
};
/**
* Converts clipboard HTML into content the editor can hold, keeping heading
* levels, bold / italic / underline / strikethrough, alignment, lists, links
* and — when `tables` is enabled — tables. Returns null when the HTML carries
* nothing to insert, so the caller can fall through to the default paste.
*/
export const parsePastedHtml = (
html: string,
{ tables = true }: { tables?: boolean } = {},
): RawDraftContentState | null => {
if (!html || typeof DOMParser === "undefined") return null;
let body: HTMLElement;
try {
body = new DOMParser().parseFromString(html, "text/html").body;
} catch {
return null;
}
Iif (!body) return null;
return toRawContent(parseBody(body, tables));
};
/**
* Inserts parsed content at the current selection as a Draft fragment, so the
* pasted blocks keep their own types, styles and entities instead of being
* folded into the block the caret sits in.
*/
export const insertPastedContent = (
editorState: EditorState,
raw: RawDraftContentState,
): EditorState => {
const fragment = convertFromRaw(raw).getBlockMap();
const content = Modifier.replaceWithFragment(
editorState.getCurrentContent(),
editorState.getSelection(),
fragment,
);
return EditorState.push(editorState, content, "insert-fragment");
};
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