feat!: refactor parse

.github/workflows/pr_title.yml

@@ -14,4 +14,4 @@ jobs:
         run: dart pub get
 
       - name: Validate Title of PR
-        run: echo ${{ github.event.pull_request.title }} | dart bin/commitlint_cli.dart
+        run: echo ${{ github.event.pull_request.title }} | dart bin/commitlint_cli.dart --config lib/commitlint.yaml

lib/src/parse.dart

@@ -4,10 +4,11 @@ import 'types/commit.dart';
 /// Parse Commit Message String to Convensional Commit
 ///
 
-const _kDefaultHeaderPattern = r'^(\w*)(?:\((.*)\))?: (.*)$';
-const _kDefaultHeaderCorrespondence = ['type', 'scope', 'subject'];
+final _kHeaderPattern =
+    RegExp(r'^(?<type>\w*?)(\((?<scope>.*)\))?!?: (?<subject>.+)$');
+const _kHeaderCorrespondence = ['type', 'scope', 'subject'];
 
-const _kDefaultReferenceActions = [
+const _kReferenceActions = [
   'close',
   'closes',
   'closed',
@@ -19,73 +20,75 @@ const _kDefaultReferenceActions = [
   'resolved'
 ];
 
-const _kDefaultIssuePrefixes = ['#'];
-const _kDefaultNoteKeywords = ['BREAKING CHANGE', 'BREAKING-CHANGE'];
-
-const _kDefaultFieldPattern = r'^-(.*?)-$';
-
-const _kDefaultRevertPattern =
-    r'^(?:Revert|revert:)\s"?([\s\S]+?)"?\s*This reverts commit (\w*)\.';
-const _kDefaultRevertCorrespondence = ['header', 'hash'];
-
-Commit parse(String raw,
-    {String headerPattern = _kDefaultHeaderPattern,
-    List<String> headerCorrespondence = _kDefaultHeaderCorrespondence,
-    List<String> referenceActions = _kDefaultReferenceActions,
-    List<String> issuePrefixes = _kDefaultIssuePrefixes,
-    List<String> noteKeywords = _kDefaultNoteKeywords,
-    String fieldPattern = _kDefaultFieldPattern,
-    String revertPattern = _kDefaultRevertPattern,
-    List<String> revertCorrespondence = _kDefaultRevertCorrespondence,
-    String? commentChar}) {
-  final message = raw.trim();
-  if (message.isEmpty) {
-    throw ArgumentError.value(raw, 'raw message', 'must have content.');
+const _kIssuePrefixes = ['#'];
+const _kNoteKeywords = ['BREAKING CHANGE', 'BREAKING-CHANGE'];
+final _kMergePattern = RegExp(r'^(Merge|merge)\s(.*)$');
+final _kRevertPattern = RegExp(
+    r'^(?:Revert|revert:)\s"?(?<header>[\s\S]+?)"?\s*This reverts commit (?<hash>\w*)\.');
+const _kRevertCorrespondence = ['header', 'hash'];
+
+final _kMentionsPattern = RegExp(r'@([\w-]+)');
+
+Commit parse(String raw) {
+  if (raw.trim().isEmpty) {
+    throw ArgumentError.value(raw, null, 'message raw must have content.');
   }
   String? body;
   String? footer;
   List<String> mentions = [];
   List<CommitNote> notes = [];
   List<CommitReference> references = [];
   Map<String, String?>? revert;
-  final lines = truncateToScissor(message.split(RegExp(r'\r?\n')))
-      .where(_gpgFilter)
-      .toList();
-  if (commentChar != null) {
-    lines.removeWhere((line) => line.startsWith(commentChar));
+  String? merge;
+  String? header;
+  final rawLines = _trimOffNewlines(raw).split(RegExp(r'\r?\n'));
+  final lines = _truncateToScissor(rawLines).where(_gpgFilter).toList();
+  merge = lines.removeAt(0);
+  final mergeMatch = _kMergePattern.firstMatch(merge);
+  if (mergeMatch != null) {
+    merge = mergeMatch.group(0);
+    if (lines.isNotEmpty) {
+      header = lines.removeAt(0);
+      while (header!.trim().isEmpty && lines.isNotEmpty) {
+        header = lines.removeAt(0);
+      }
+    }
+    header ??= '';
+  } else {
+    header = merge;
+    merge = null;
   }
-  final header = lines.removeAt(0);
-  final headerMatch = RegExp(headerPattern).matchAsPrefix(header);
+  final headerMatch = _kHeaderPattern.firstMatch(header);
   final headerParts = <String, String?>{};
   if (headerMatch != null) {
-    for (var i = 0; i < headerCorrespondence.length; i++) {
-      headerParts[headerCorrespondence[i]] = headerMatch.group(i + 1);
+    for (var name in _kHeaderCorrespondence) {
+      headerParts[name] = headerMatch.namedGroup(name);
     }
   }
-  final referencesPattern = getReferenceRegex(referenceActions);
-  final referencePartsPattern = getReferencePartsRegex(issuePrefixes, false);
-  references.addAll(getReferences(header,
+  final referencesPattern = _getReferenceRegex(_kReferenceActions);
+  final referencePartsPattern = _getReferencePartsRegex(_kIssuePrefixes, false);
+  references.addAll(_getReferences(header,
       referencesPattern: referencesPattern,
       referencePartsPattern: referencePartsPattern));
 
   bool continueNote = false;
   bool isBody = true;
-  final notesPattern = getNotesRegex(noteKeywords);
+  final notesPattern = _getNotesRegex(_kNoteKeywords);
 
   /// body or footer
   for (var line in lines) {
     bool referenceMatched = false;
-    final notesMatch = notesPattern.matchAsPrefix(line);
+    final notesMatch = notesPattern.firstMatch(line);
     if (notesMatch != null) {
       continueNote = true;
       isBody = false;
-      footer = append(footer, line);
-      notes.add(CommitNote(
-          title: notesMatch.group(1)!, text: notesMatch.group(2)!.trim()));
-      break;
+      footer = _append(footer, line);
+      notes.add(
+          CommitNote(title: notesMatch.group(1)!, text: notesMatch.group(2)!));
+      continue;
     }
 
-    final lineReferences = getReferences(
+    final lineReferences = _getReferences(
       line,
       referencesPattern: referencesPattern,
       referencePartsPattern: referencePartsPattern,
@@ -95,58 +98,72 @@ Commit parse(String raw,
       isBody = false;
       referenceMatched = true;
       continueNote = false;
+      references.addAll(lineReferences);
     }
 
-    references.addAll(lineReferences);
-
     if (referenceMatched) {
-      footer = append(footer, line);
-      break;
+      footer = _append(footer, line);
+      continue;
     }
 
     if (continueNote) {
-      notes.last.text = append(notes.last.text, line).trim();
-      footer = append(footer, line);
-      break;
+      notes.last.text = _append(notes.last.text, line);
+      footer = _append(footer, line);
+      continue;
     }
     if (isBody) {
-      body = append(body, line);
+      body = _append(body, line);
     } else {
-      footer = append(footer, line);
+      footer = _append(footer, line);
     }
   }
 
-  Match? mentionsMatch;
-  final mentionsPattern = RegExp(r'@([\w-]+)');
-  while ((mentionsMatch =
-          mentionsPattern.matchAsPrefix(raw, mentionsMatch?.end ?? 0)) !=
-      null) {
-    mentions.add(mentionsMatch!.group(1)!);
+  Match? mentionsMatch = _kMentionsPattern.firstMatch(raw);
+  while (mentionsMatch != null) {
+    mentions.add(mentionsMatch.group(1)!);
+    mentionsMatch = _kMentionsPattern.matchAsPrefix(raw, mentionsMatch.end);
   }
 
   // does this commit revert any other commit?
-  final revertMatch = raw.matchAsPrefix(revertPattern);
+  final revertMatch = _kRevertPattern.firstMatch(raw);
   if (revertMatch != null) {
     revert = {};
-    for (var i = 0; i < revertCorrespondence.length; i++) {
-      revert[revertCorrespondence[i]] = revertMatch.group(i + 1);
+    for (var i = 0; i < _kRevertCorrespondence.length; i++) {
+      revert[_kRevertCorrespondence[i]] = revertMatch.group(i + 1);
     }
   }
 
+  for (var note in notes) {
+    note.text = _trimOffNewlines(note.text);
+  }
   return Commit(
+    revert: revert,
+    merge: merge,
     header: header,
     type: headerParts['type'],
     scope: headerParts['scope'],
     subject: headerParts['subject'],
-    body: body?.trim(),
-    footer: footer?.trim(),
+    body: body != null ? _trimOffNewlines(body) : null,
+    footer: footer != null ? _trimOffNewlines(footer) : null,
     notes: notes,
     references: references,
     mentions: mentions,
-    revert: revert,
   );
 }
 
+String _trimOffNewlines(String input) {
+  final result = RegExp(r'[^\r\n]').firstMatch(input);
+  if (result == null) {
+    return '';
+  }
+  final firstIndex = result.start;
+  var lastIndex = input.length - 1;
+  while (input[lastIndex] == '\r' || input[lastIndex] == '\n') {
+    lastIndex--;
+  }
+  return input.substring(firstIndex, lastIndex + 1);
+}
+
 bool _gpgFilter(String line) {
   return !RegExp(r'^\s*gpg:').hasMatch(line);
 }
@@ -155,7 +172,7 @@ final _kMatchAll = RegExp(r'()(.+)', caseSensitive: false);
 
 const _kScissor = '# ------------------------ >8 ------------------------';
 
-List<String> truncateToScissor(List<String> lines) {
+List<String> _truncateToScissor(List<String> lines) {
   final scissorIndex = lines.indexOf(_kScissor);
 
   if (scissorIndex == -1) {
@@ -165,48 +182,46 @@ List<String> truncateToScissor(List<String> lines) {
   return lines.sublist(0, scissorIndex);
 }
 
-List<CommitReference> getReferences(
+List<CommitReference> _getReferences(
   String input, {
-  required Pattern referencesPattern,
-  required Pattern referencePartsPattern,
+  required RegExp referencesPattern,
+  required RegExp referencePartsPattern,
 }) {
   final references = <CommitReference>[];
-  Match? referenceSentences;
-  Match? referenceMatch;
-
-  final reApplicable = referencesPattern.allMatches(input).isNotEmpty
-      ? referencesPattern
-      : _kMatchAll;
-  while ((referenceSentences =
-          reApplicable.matchAsPrefix(input, referenceSentences?.end ?? 0)) !=
-      null) {
-    final action = referenceSentences!.group(1)!;
-    final sentence = referenceSentences.group(2)!;
-    while ((referenceMatch = referencePartsPattern.matchAsPrefix(
-            sentence, referenceMatch?.end ?? 0)) !=
-        null) {
+  final reApplicable =
+      referencesPattern.hasMatch(input) ? referencesPattern : _kMatchAll;
+  Match? referenceSentences = reApplicable.firstMatch(input);
+  while (referenceSentences != null) {
+    final action = referenceSentences.group(1);
+    final sentence = referenceSentences.group(2);
+    Match? referenceMatch = referencePartsPattern.firstMatch(sentence!);
+    while (referenceMatch != null) {
       String? owner;
-      String? repository = referenceMatch!.group(1);
+      String? repository = referenceMatch.group(1);
       final ownerRepo = repository?.split('/') ?? [];
 
       if (ownerRepo.length > 1) {
         owner = ownerRepo.removeAt(0);
         repository = ownerRepo.join('/');
       }
       references.add(CommitReference(
-        raw: referenceMatch.group(0)!,
         action: action,
         owner: owner,
         repository: repository,
         issue: referenceMatch.group(3),
+        raw: referenceMatch.group(0)!,
         prefix: referenceMatch.group(2)!,
       ));
+      referenceMatch =
+          referencePartsPattern.matchAsPrefix(sentence, referenceMatch.end);
     }
+    referenceSentences =
+        reApplicable.matchAsPrefix(input, referenceSentences.end);
   }
   return references;
 }
 
-Pattern getReferenceRegex(Iterable<String> referenceActions) {
+RegExp _getReferenceRegex(Iterable<String> referenceActions) {
   if (referenceActions.isEmpty) {
     // matches everything
     return RegExp(r'()(.+)', caseSensitive: false); //gi
@@ -217,7 +232,7 @@ Pattern getReferenceRegex(Iterable<String> referenceActions) {
       caseSensitive: false);
 }
 
-Pattern getReferencePartsRegex(
+RegExp _getReferencePartsRegex(
     List<String> issuePrefixes, bool issuePrefixesCaseSensitive) {
   if (issuePrefixes.isEmpty) {
     return RegExp(r'(?!.*)');
@@ -227,17 +242,19 @@ Pattern getReferencePartsRegex(
       caseSensitive: issuePrefixesCaseSensitive);
 }
 
-Pattern getNotesRegex(List<String> noteKeywords) {
+RegExp _getNotesRegex(List<String> noteKeywords) {
   if (noteKeywords.isEmpty) {
     return RegExp(r'(?!.*)');
   }
   final noteKeywordsSelection = noteKeywords.join('|');
-  return RegExp('^[\\s|*]*($noteKeywordsSelection)[:\\s]+(.*)',
-      caseSensitive: false);
+  return RegExp(
+    '^[\\s|*]*($noteKeywordsSelection)[:\\s]+(.*)',
+    caseSensitive: false,
+  );
 }
 
-String append(String? src, String line) {
-  if (src != null) {
+String _append(String? src, String line) {
+  if (src != null && src.isNotEmpty) {
     return '$src\n$line';
   } else {
     return line;

lib/src/types/commit.dart

@@ -89,4 +89,18 @@ class CommitReference {
     this.repository,
     this.issue,
   });
+
+  @override
+  operator ==(other) {
+    return other is CommitReference &&
+        raw == other.raw &&
+        prefix == other.prefix &&
+        action == other.action &&
+        owner == other.owner &&
+        repository == other.repository &&
+        issue == other.issue;
+  }
+
+  @override
+  int get hashCode => raw.hashCode;
 }

pubspec.yaml

@@ -16,6 +16,7 @@ dependencies:
   yaml: ^3.1.1
 
 dev_dependencies:
+  collection: ^1.17.1
   husky: ^0.1.6
   lint_staged: ^0.2.0
   lints: ^2.0.0