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import { createText } from 'roosterjs-content-model-dom';
import type {
ContentModelLink,
ContentModelSegment,
ContentModelSegmentFormat,
ContentModelText,
} from 'roosterjs-content-model-types';
/**
* @internal
*/
interface FormattingState {
bold: boolean;
italic: boolean;
strikethrough: boolean;
}
/**
* @internal
*/
interface FormatMarker {
type: 'bold' | 'italic' | 'strikethrough';
length: number;
}
// Matches a markdown link [text](url) anchored at the start of the input.
const linkPattern = /^\[([^\[\]]+)\]\(([^\)]+)\)/;
// Matches a markdown image  anchored at the start of the input.
const imagePattern = /^!\[([^\[\]]+)\]\(([^\)]+)\)/;
/**
* @internal
* Parse a markdown inline string into Content Model segments. Supports bold/italic/
* strikethrough markers, links, and images, and keeps formatting state active across
* link boundaries (e.g. **[link](url)**).
*/
export function parseInlineSegments(
text: string,
segments: ContentModelSegment[],
state: FormattingState = { bold: false, italic: false, strikethrough: false },
link?: ContentModelLink
) {
let buffer = '';
let i = 0;
const flushBuffer = () => {
if (buffer.length > 0) {
segments.push(createFormattedSegment(buffer, state, link));
buffer = '';
}
};
while (i < text.length) {
const remaining = text.substring(i);
// Escaped character: a backslash followed by an ASCII punctuation character emits
// that character literally (e.g. "\*" -> "*") and is never treated as a marker.
if (text[i] === '\\' && i + 1 < text.length && isEscapable(text[i + 1])) {
buffer += text[i + 1];
i += 2;
continue;
}
// Image: 
const imgMatch = imagePattern.exec(remaining);
if (imgMatch && isValidUrl(imgMatch[2])) {
flushBuffer();
segments.push(createImageSegment(imgMatch[1], imgMatch[2]));
i += imgMatch[0].length;
continue;
}
// Link: [text](url) — keep outer formatting state active inside the link
const linkMatch = linkPattern.exec(remaining);
if (linkMatch && isValidUrl(linkMatch[2])) {
flushBuffer();
const innerLink: ContentModelLink = {
dataset: {},
format: { href: linkMatch[2], underline: true },
};
parseInlineSegments(linkMatch[1], segments, state, innerLink);
i += linkMatch[0].length;
continue;
}
// Formatting marker
const marker = parseMarkerAt(text, i);
if (marker && shouldToggleFormatting(text, i, marker, state)) {
flushBuffer();
toggleFormatting(state, marker.type);
i += marker.length;
continue;
}
buffer += text[i];
i++;
}
flushBuffer();
}
function parseMarkerAt(text: string, index: number): FormatMarker | null {
const remaining = text.substring(index);
if (remaining.startsWith('~~')) {
return { type: 'strikethrough', length: 2 };
}
if (remaining.startsWith('**')) {
return { type: 'bold', length: 2 };
}
if (remaining.startsWith('*')) {
return { type: 'italic', length: 1 };
}
return null;
}
function shouldToggleFormatting(
text: string,
index: number,
marker: FormatMarker,
currentState: FormattingState
): boolean {
const isCurrentlyActive = getCurrentFormatState(currentState, marker.type);
if (isCurrentlyActive) {
return true;
}
// Opening marker must be followed by a non-whitespace character.
const nextIndex = index + marker.length;
const nextChar = nextIndex < text.length ? text.charAt(nextIndex) : '';
if (nextChar.length === 0 || isWhitespace(nextChar)) {
return false;
}
return true;
}
function isWhitespace(char: string): boolean {
return /\s/.test(char);
}
function isEscapable(char: string): boolean {
// Per CommonMark, any ASCII punctuation character may be backslash-escaped.
return /[!"#$%&'()*+,\-./:;<=>?@[\\\]^_`{|}~]/.test(char);
}
function toggleFormatting(state: FormattingState, type: 'bold' | 'italic' | 'strikethrough'): void {
switch (type) {
case 'bold':
state.bold = !state.bold;
break;
case 'italic':
state.italic = !state.italic;
break;
case 'strikethrough':
state.strikethrough = !state.strikethrough;
break;
}
}
function getCurrentFormatState(
state: FormattingState,
type: 'bold' | 'italic' | 'strikethrough'
): boolean {
switch (type) {
case 'bold':
return state.bold;
case 'italic':
return state.italic;
case 'strikethrough':
return state.strikethrough;
}
}
function createFormattedSegment(
text: string,
state: FormattingState,
link?: ContentModelLink
): ContentModelText {
const format: ContentModelSegmentFormat = {};
if (state.bold) {
format.fontWeight = 'bold';
}
if (state.italic) {
format.italic = true;
}
if (state.strikethrough) {
format.strikethrough = true;
}
return createText(text, format, link);
}
function isValidUrl(url: string): boolean {
Iif (!url) {
return false;
}
if (
url.startsWith('data:') ||
url.startsWith('blob:') ||
url.startsWith('/') ||
url.startsWith('./') ||
url.startsWith('../')
) {
return true;
}
try {
const parsed = new URL(url);
return parsed.protocol === 'http:' || parsed.protocol === 'https:';
} catch (_) {
return false;
}
}
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