box-ui-elements/es/components/form-elements/draft-js-mention-selector/utils.js

Box UI Elements

import { EditorState, Modifier } from 'draft-js';
const defaultMentionTriggers = ['@', '＠', '﹫'];
const defaultMentionTriggersString = defaultMentionTriggers.reduce((prev, current) => `${prev}\\${current}`, '');
const defaultMentionPattern = new RegExp(`([${defaultMentionTriggersString}])([^${defaultMentionTriggersString}]*)$`);

/**
 * Extracts the active mention from the editor state
 */
function getActiveMentionForEditorState(editorState, mentionPattern = defaultMentionPattern) {
  const contentState = editorState.getCurrentContent();
  const selectionState = editorState.getSelection();
  const startKey = selectionState.getStartKey();
  const activeBlock = contentState.getBlockForKey(startKey);
  const cursorPosition = selectionState.getStartOffset();
  let result = null;

  // Break the active block into entity ranges.
  activeBlock.findEntityRanges(character => character.getEntity() === null, (start, end) => {
    // Find the active range (is the cursor inside this range?)
    if (start <= cursorPosition && cursorPosition <= end) {
      // Determine if the active range contains a mention.
      const activeRangeText = activeBlock.getText().substr(start, cursorPosition - start);
      const mentionMatch = activeRangeText.match(mentionPattern);
      if (mentionMatch) {
        result = {
          blockID: startKey,
          mentionString: mentionMatch[2],
          mentionTrigger: mentionMatch[1],
          start: start + mentionMatch.index,
          end: cursorPosition
        };
      }
    }
    return null;
  });
  return result;
}

/**
 * Inserts a selected mention into the editor
 */
function addMention(editorState, activeMention, mention) {
  const {
    start,
    end
  } = activeMention || {};
  const {
    id,
    name
  } = mention;
  const contentState = editorState.getCurrentContent();
  const selectionState = editorState.getSelection();
  const preInsertionSelectionState = selectionState.merge({
    anchorOffset: start,
    focusOffset: end
  });
  const textToInsert = `@${name}`;
  const contentStateWithEntity = contentState.createEntity('MENTION', 'IMMUTABLE', {
    id
  });
  const entityKey = contentStateWithEntity.getLastCreatedEntityKey();
  const contentStateWithLink = Modifier.replaceText(contentState, preInsertionSelectionState, textToInsert, null, entityKey);
  const spaceOffset = preInsertionSelectionState.getStartOffset() + textToInsert.length;
  const selectionStateForAddingSpace = preInsertionSelectionState.merge({
    anchorOffset: spaceOffset,
    focusOffset: spaceOffset
  });
  const contentStateWithLinkAndExtraSpace = Modifier.insertText(contentStateWithLink, selectionStateForAddingSpace, ' ');
  const editorStateWithLink = EditorState.push(editorState, contentStateWithLinkAndExtraSpace, 'change-block-type');
  return editorStateWithLink;
}

/**
 * Formats the editor's text such that it will be accepted by the server.
 */
function getFormattedCommentText(editorState) {
  const contentState = editorState.getCurrentContent();
  const blockMap = contentState.getBlockMap();
  const resultStringArr = [];

  // The API needs to explicitly know if a message contains a mention.
  let hasMention = false;

  // For all ContentBlocks in the ContentState:
  blockMap.forEach(block => {
    const text = block.getText();
    const blockMapStringArr = [];

    // Break down the ContentBlock into ranges
    block.findEntityRanges(() => true, (start, end) => {
      const entityKey = block.getEntityAt(start);
      // If the range is an Entity, format its text eg "@[1:Username]"
      // Otherwise append its text to the block result as-is
      if (entityKey) {
        const entity = contentState.getEntity(entityKey);
        const stringToAdd = `@[${entity.getData().id}:${text.substring(start + 1, end)}]`;
        blockMapStringArr.push(stringToAdd);
        hasMention = true;
      } else {
        blockMapStringArr.push(text.substring(start, end));
      }
    });
    resultStringArr.push(blockMapStringArr.join(''));
  });

  // Concatenate the array of block strings with newlines
  // (Each block represents a paragraph)
  return {
    text: resultStringArr.join('\n'),
    hasMention
  };
}
export { addMention, defaultMentionTriggers, defaultMentionPattern, getActiveMentionForEditorState, getFormattedCommentText };
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