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// Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
library dart_style.example.format;
import 'dart:io';
import 'dart:mirrors';
import 'package:path/path.dart' as p;
import 'package:dart_style/dart_style.dart';
import 'package:dart_style/src/debug.dart' as debug;
void main(List<String> args) {
formatUnit("""
extension A on B {
var a = 1;
b() {}
c() => null;
get d {}
get e => null;
set f(value) {}
set g(value) => null;
var h = 1;
}
""");
}
void formatStmt(String source, [int pageWidth = 80]) {
runFormatter(source, pageWidth, isCompilationUnit: false);
}
void formatUnit(String source, [int pageWidth = 80]) {
runFormatter(source, pageWidth, isCompilationUnit: true);
}
void runFormatter(String source, int pageWidth, {bool isCompilationUnit}) {
try {
var formatter = DartFormatter(pageWidth: pageWidth);
var result;
if (isCompilationUnit) {
result = formatter.format(source);
} else {
result = formatter.formatStatement(source);
}
drawRuler("before", pageWidth);
print(source);
drawRuler("after", pageWidth);
print(result);
} on FormatterException catch (error) {
print(error.message());
}
}
void drawRuler(String label, int width) {
var padding = " " * (width - label.length - 1);
print("$label:$padding|");
}
/// Runs the formatter test starting on [line] at [path] inside the "test"
/// directory.
void runTest(String path, int line) {
var indentPattern = RegExp(r"^\(indent (\d+)\)\s*");
// Locate the "test" directory. Use mirrors so that this works with the test
// package, which loads this suite into an isolate.
var testDir = p.join(
p.dirname(currentMirrorSystem()
.findLibrary(#dart_style.example.format)
.uri
.path),
"../test");
var lines = File(p.join(testDir, path)).readAsLinesSync();
// The first line may have a "|" to indicate the page width.
var pageWidth = 80;
if (lines[0].endsWith("|")) {
pageWidth = lines[0].indexOf("|");
lines = lines.skip(1).toList();
}
var i = 0;
while (i < lines.length) {
var description = lines[i++].replaceAll(">>>", "").trim();
// Let the test specify a leading indentation. This is handy for
// regression tests which often come from a chunk of nested code.
var leadingIndent = 0;
var indentMatch = indentPattern.firstMatch(description);
if (indentMatch != null) {
leadingIndent = int.parse(indentMatch[1]);
description = description.substring(indentMatch.end);
}
if (description == "") {
description = "line ${i + 1}";
} else {
description = "line ${i + 1}: $description";
}
var startLine = i + 1;
var input = "";
while (!lines[i].startsWith("<<<")) {
input += lines[i++] + "\n";
}
var expectedOutput = "";
while (++i < lines.length && !lines[i].startsWith(">>>")) {
expectedOutput += lines[i] + "\n";
}
if (line != startLine) continue;
var isCompilationUnit = p.extension(path) == ".unit";
var inputCode =
_extractSelection(input, isCompilationUnit: isCompilationUnit);
var expected =
_extractSelection(expectedOutput, isCompilationUnit: isCompilationUnit);
var formatter = DartFormatter(pageWidth: pageWidth, indent: leadingIndent);
var actual = formatter.formatSource(inputCode);
// The test files always put a newline at the end of the expectation.
// Statements from the formatter (correctly) don't have that, so add
// one to line up with the expected result.
var actualText = actual.text;
if (!isCompilationUnit) actualText += "\n";
print("$path $description");
drawRuler("before", pageWidth);
print(input);
if (actualText == expected.text) {
drawRuler("result", pageWidth);
print(actualText);
} else {
print("FAIL");
drawRuler("expected", pageWidth);
print(expected.text);
drawRuler("actual", pageWidth);
print(actualText);
}
}
}
/// Given a source string that contains ‹ and › to indicate a selection, returns
/// a [SourceCode] with the text (with the selection markers removed) and the
/// correct selection range.
SourceCode _extractSelection(String source, {bool isCompilationUnit = false}) {
var start = source.indexOf("‹");
source = source.replaceAll("‹", "");
var end = source.indexOf("›");
source = source.replaceAll("›", "");
return SourceCode(source,
isCompilationUnit: isCompilationUnit,
selectionStart: start == -1 ? null : start,
selectionLength: end == -1 ? null : end - start);
}