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ansu_ui/example/tool/codeviewer_cli/segment_generator.dart

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7.7 KiB

// Copyright 2019 The Flutter team. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'dart:convert';
import 'dart:io';
import 'prehighlighter.dart';
const _globalPrologue =
'''// This file is automatically generated by codeviewer_cli.
// Do not edit this file.
// Copyright 2019 The Flutter team. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'package:flutter/material.dart';
import 'package:example/codeviewer/code_style.dart';
class CodeSegments {
''';
const _globalEpilogue = '}\n';
final Pattern beginSubsegment = RegExp(r'//\s+BEGIN');
final Pattern endSubsegment = RegExp(r'//\s+END');
enum _FileReadStatus {
comments,
imports,
finished,
}
/// Returns the new status of the scanner whose previous status was
/// [oldStatus], after scanning the line [line].
_FileReadStatus _updatedStatus(_FileReadStatus oldStatus, String line) {
_FileReadStatus lineStatus;
if (line.trim().startsWith('//')) {
lineStatus = _FileReadStatus.comments;
} else if (line.trim().startsWith('import')) {
lineStatus = _FileReadStatus.imports;
} else {
lineStatus = _FileReadStatus.finished;
}
_FileReadStatus newStatus;
switch (oldStatus) {
case _FileReadStatus.comments:
newStatus =
(line.trim().isEmpty || lineStatus == _FileReadStatus.comments)
? _FileReadStatus.comments
: lineStatus;
break;
case _FileReadStatus.imports:
newStatus = (line.trim().isEmpty || lineStatus == _FileReadStatus.imports)
? _FileReadStatus.imports
: _FileReadStatus.finished;
break;
case _FileReadStatus.finished:
newStatus = oldStatus;
break;
}
return newStatus;
}
Map<String, String> _createSegments(String sourceDirectoryPath) {
final files = Directory(sourceDirectoryPath)
.listSync(recursive: true)
.whereType<File>()
.toList();
var subsegments = <String, StringBuffer>{};
var subsegmentPrologues = <String, String>{};
var appearedSubsegments = <String>{};
for (final file in files) {
// Process file.
final content = file.readAsStringSync();
final lines = const LineSplitter().convert(content);
var status = _FileReadStatus.comments;
final prologue = StringBuffer();
final activeSubsegments = <String>{};
for (final line in lines) {
// Update status.
status = _updatedStatus(status, line);
if (status != _FileReadStatus.finished) {
prologue.writeln(line);
}
// Process run commands.
if (line.trim().startsWith(beginSubsegment)) {
final argumentString = line.replaceFirst(beginSubsegment, '').trim();
var arguments = argumentString.isEmpty
? <String>[]
: argumentString.split(RegExp(r'\s+'));
for (final argument in arguments) {
if (activeSubsegments.contains(argument)) {
throw PreformatterException(
'BEGIN $argument is used twice in file ${file.path}');
} else if (appearedSubsegments.contains(argument)) {
throw PreformatterException('BEGIN $argument is used twice');
} else {
activeSubsegments.add(argument);
appearedSubsegments.add(argument);
subsegments[argument] = StringBuffer();
subsegmentPrologues[argument] = prologue.toString();
}
}
} else if (line.trim().startsWith(endSubsegment)) {
final argumentString = line.replaceFirst(endSubsegment, '').trim();
final arguments = argumentString.isEmpty
? <String>[]
: argumentString.split(RegExp(r'\s+'));
if (arguments.isEmpty && activeSubsegments.length == 1) {
arguments.add(activeSubsegments.first);
}
for (final argument in arguments) {
if (activeSubsegments.contains(argument)) {
activeSubsegments.remove(argument);
} else {
throw PreformatterException(
'END $argument is used without a paired BEGIN in ${file.path}');
}
}
} else {
// Simple line.
for (final name in activeSubsegments) {
subsegments[name].writeln(line);
}
}
}
if (activeSubsegments.isNotEmpty) {
throw PreformatterException('File ${file.path} has unpaired BEGIN');
}
}
var segments = <String, List<TaggedString>>{};
var segmentPrologues = <String, String>{};
// Sometimes a code segment is made up of subsegments. They are marked by
// names with a "#" symbol in it, such as "bottomSheetDemoModal#1" and
// "bottomSheetDemoModal#2".
// The following code groups the subsegments by order into segments.
subsegments.forEach((key, value) {
String name;
double order;
if (key.contains('#')) {
var parts = key.split('#');
name = parts[0];
order = double.parse(parts[1]);
} else {
name = key;
order = 0;
}
if (!segments.containsKey(name)) {
segments[name] = [];
}
segments[name].add(
TaggedString(
text: value.toString(),
order: order,
),
);
segmentPrologues[name] = subsegmentPrologues[key];
});
segments.forEach((key, value) {
value.sort((ts1, ts2) => (ts1.order - ts2.order).sign.round());
});
var answer = <String, String>{};
for (final name in segments.keys) {
final buffer = StringBuffer();
buffer.write(segmentPrologues[name].trim());
buffer.write('\n\n');
for (final ts in segments[name]) {
buffer.write(ts.text.trim());
buffer.write('\n\n');
}
answer[name] = buffer.toString();
}
return answer;
}
/// A string [text] together with a number [order], for sorting purposes.
/// Used to store different subsegments of a code segment.
/// The [order] of each subsegment is tagged with the code in order to be
/// sorted in the desired order.
class TaggedString {
TaggedString({this.text, this.order});
final String text;
final double order;
}
void _formatSegments(Map<String, String> segments, IOSink output) {
output.write(_globalPrologue);
final sortedNames = segments.keys.toList()..sort();
for (final name in sortedNames) {
final code = segments[name];
output.writeln(' static TextSpan $name (BuildContext context) {');
output.writeln(' final codeStyle = CodeStyle.of(context);');
output.writeln(' return TextSpan(children: [');
final codeSpans = DartSyntaxPrehighlighter().format(code);
for (final span in codeSpans) {
output.write(' ');
output.write(span.toString());
output.write(',\n');
}
output.write(' ]); }\n');
}
output.write(_globalEpilogue);
output.close();
}
/// Collect code segments, highlight, and write to file.
///
/// [writeSegments] walks through the directory specified by
/// [sourceDirectoryPath] and reads every file in it,
/// collects code segments marked by "// BEGIN <segment_name>" and "// END",
/// highlights them, and writes to the file specified by
/// [targetFilePath]. If [isDryRun] is true, the output will
/// be written to stdout.
///
/// The output file is a dart source file with a class "CodeSegments" and
/// static methods of type TextSpan(BuildContext context).
/// Each method generates a widget that displays a segment of code.
///
/// The target file is overwritten.
void writeSegments(
{String sourceDirectoryPath, String targetFilePath, bool isDryRun}) {
final segments = _createSegments(sourceDirectoryPath);
final output = isDryRun ? stdout : File(targetFilePath).openWrite();
_formatSegments(segments, output);
}
class PreformatterException implements Exception {
PreformatterException(this.cause);
String cause;
}