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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 | 1x 1x 258x 258x 9x 249x 249x 249x 249x 249x 2820x 2820x 272x 193x 135x 135x 193x 193x 79x 79x 2548x 2548x 249x 212x 249x 196x 53x 258x 258x 258x 258x 258x 2820x 2820x 36x 2784x 122x 2662x 114x 2548x 272x 272x 272x 96x 176x 153x 193x 93x 93x 72x 72x 28x 28x 272x 122x 114x 36x 347x 347x 57x 347x 41x 347x 18x 347x | import { createText } from 'roosterjs-content-model-dom';
import type {
ContentModelLink,
ContentModelSegmentFormat,
ContentModelText,
} from 'roosterjs-content-model-types';
interface FormattingState {
bold: boolean;
italic: boolean;
strikethrough: boolean;
}
interface FormatMarker {
type: 'bold' | 'italic' | 'strikethrough';
length: number;
}
/**
* @internal
*/
export function applyTextFormatting(textSegment: ContentModelText) {
const text = textSegment.text;
// Quick check: if the text contains only formatting markers, return original
if (isOnlyFormattingMarkers(text)) {
return [textSegment];
}
const textSegments: ContentModelText[] = [];
const currentState: FormattingState = { bold: false, italic: false, strikethrough: false };
let currentText = '';
let i = 0;
while (i < text.length) {
const marker = parseMarkerAt(text, i);
if (marker) {
// Check if this marker should be treated as formatting or as literal text
if (shouldToggleFormatting(text, i, marker, currentState)) {
// If we have accumulated text, create a segment for it
if (currentText.length > 0) {
textSegments.push(
createFormattedSegment(
currentText,
textSegment.format,
currentState,
textSegment.link
)
);
currentText = '';
}
// Toggle the formatting state
toggleFormatting(currentState, marker.type);
// Skip the marker characters
i += marker.length;
} else {
// Treat as regular text if marker is not valid in this context
currentText += text[i];
i++;
}
} else {
// Regular character, add to current text
currentText += text[i];
i++;
}
}
// Add any remaining text as a final segment
if (currentText.length > 0) {
textSegments.push(
createFormattedSegment(currentText, textSegment.format, currentState, textSegment.link)
);
}
// If no meaningful formatting was applied, return the original segment
if (
textSegments.length === 0 ||
(textSegments.length === 1 && textSegments[0].text === textSegment.text)
) {
return [textSegment];
}
return textSegments;
}
function isOnlyFormattingMarkers(text: string): boolean {
// Remove all potential formatting markers and see if anything remains
let remaining = text;
remaining = remaining.replace(/\*\*/g, ''); // Remove **
remaining = remaining.replace(/~~/g, ''); // Remove ~~
remaining = remaining.replace(/\*/g, ''); // Remove *
// If nothing remains after removing all markers, it was only markers
return remaining.length === 0;
}
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 nextChar = index + marker.length < text.length ? text.charAt(index + marker.length) : '';
const isCurrentlyActive = getCurrentFormatState(currentState, marker.type);
if (isCurrentlyActive) {
// We're currently in this format, so any marker can close it
return true;
} else {
// We're not in this format, so this marker would open it
// Opening markers must be followed by non-whitespace
return nextChar.length > 0 && !isWhitespace(nextChar);
}
}
function isWhitespace(char: string): boolean {
return /\s/.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,
baseFormat: ContentModelSegmentFormat,
state: FormattingState,
link?: ContentModelLink
): ContentModelText {
const format: ContentModelSegmentFormat = { ...baseFormat };
if (state.bold) {
format.fontWeight = 'bold';
}
if (state.italic) {
format.italic = true;
}
if (state.strikethrough) {
format.strikethrough = true;
}
return createText(text, format, link);
}
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