116 lines
3.9 KiB
Dart
116 lines
3.9 KiB
Dart
import 'package:flutter/material.dart';
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import 'package:fluffychat/pangea/analytics_misc/message_analytics_controller.dart';
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import 'package:fluffychat/pangea/common/utils/error_handler.dart';
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import 'package:fluffychat/pangea/events/event_wrappers/pangea_message_event.dart';
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import 'package:fluffychat/pangea/events/models/pangea_token_model.dart';
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import 'package:fluffychat/pangea/toolbar/widgets/message_token_text.dart';
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class MessageTextUtil {
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static List<TokenPosition>? getTokenPositions(
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PangeaMessageEvent pangeaMessageEvent, {
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MessageAnalyticsEntry? messageAnalyticsEntry,
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bool Function(PangeaToken)? isSelected,
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}) {
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try {
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if (pangeaMessageEvent.messageDisplayRepresentation?.tokens == null) {
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return null;
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}
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// Convert the entire message into a list of characters
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final Characters messageCharacters =
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pangeaMessageEvent.messageDisplayText.characters;
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// When building token positions, use grapheme cluster indices
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final List<TokenPosition> tokenPositions = [];
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int globalIndex = 0;
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final tokens = pangeaMessageEvent.messageDisplayRepresentation!.tokens!;
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int pointer = 0;
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while (pointer < tokens.length) {
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PangeaToken token = tokens[pointer];
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final start = token.start;
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final end = token.end;
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// Calculate the number of grapheme clusters up to the start and end positions
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final int startIndex = messageCharacters.take(start).length;
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int endIndex = messageCharacters.take(end).length;
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final hideContent =
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messageAnalyticsEntry?.isTokenInHiddenWordActivity(token) ?? false;
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final hasHiddenContent =
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messageAnalyticsEntry?.hasHiddenWordActivity ?? false;
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// if this is white space, add position without token
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if (globalIndex < startIndex) {
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tokenPositions.add(
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TokenPosition(
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start: globalIndex,
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end: startIndex,
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tokenStart: globalIndex,
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tokenEnd: startIndex,
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hideContent: false,
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selected: (isSelected?.call(token) ?? false) && !hasHiddenContent,
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),
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);
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}
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// group tokens with punctuation before and after so punctuation doesn't cause newline
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int nextTokenPointer = pointer + 1;
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while (nextTokenPointer < tokens.length) {
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final nextToken = tokens[nextTokenPointer];
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if (token.pos == 'PUNCT' && token.end == nextToken.start) {
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token = nextToken;
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nextTokenPointer++;
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endIndex = messageCharacters.take(nextToken.end).length;
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continue;
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}
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break;
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}
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while (nextTokenPointer < tokens.length) {
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final nextToken = tokens[nextTokenPointer];
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if (nextToken.pos == 'PUNCT' && token.end == nextToken.start) {
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nextTokenPointer++;
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endIndex = messageCharacters.take(nextToken.end).length;
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continue;
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}
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break;
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}
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tokenPositions.add(
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TokenPosition(
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start: startIndex,
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end: endIndex,
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tokenStart: messageCharacters.take(token.start).length,
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tokenEnd: messageCharacters.take(token.end).length,
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token: token,
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hideContent: hideContent,
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selected: (isSelected?.call(token) ?? false) &&
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!hideContent &&
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!hasHiddenContent,
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),
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);
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globalIndex = endIndex;
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pointer = nextTokenPointer;
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continue;
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}
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return tokenPositions;
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} catch (err, s) {
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ErrorHandler.logError(
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e: err,
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s: s,
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data: {
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'pangeaMessageEvent': pangeaMessageEvent,
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'messageAnalyticsEntry': messageAnalyticsEntry,
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'isSelected': isSelected,
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},
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);
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return null;
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}
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}
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}
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