Allow resolving links that contain inline syntax.

test/utils.dart

+// 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 markdown.test.utils;
+
+import 'package:unittest/unittest.dart';
+
+import 'package:markdown/markdown.dart';
+
+/// Removes eight spaces of leading indentation from a multiline string.
+///
+/// Note that this is very sensitive to how the literals are styled. They should
+/// be:
+///     '''
+///     Text starts on own line. Lines up with subsequent lines.
+///     Lines are indented exactly 8 characters from the left margin.'''
+///
+/// This does nothing if text is only a single line.
+// TODO(nweiz): Make this auto-detect the indentation level from the first
+// non-whitespace line.
+String cleanUpLiteral(String text) {
+  var lines = text.split('\n');
+  if (lines.length <= 1) return text;
+
+  for (var j = 0; j < lines.length; j++) {
+    if (lines[j].length > 8) {
+      lines[j] = lines[j].substring(8, lines[j].length);
+    } else {
+      lines[j] = '';
+    }
+  }
+
+  return lines.join('\n');
+}
+
+void validate(String description, String markdown, String html,
+    {List<InlineSyntax> inlineSyntaxes,
+    Resolver linkResolver, Resolver imageLinkResolver,
+    bool inlineOnly: false}) {
+  test(description, () {
+    markdown = cleanUpLiteral(markdown);
+    html = cleanUpLiteral(html);
+
+    var result = markdownToHtml(markdown,
+        inlineSyntaxes: inlineSyntaxes,
+        linkResolver: linkResolver,
+        imageLinkResolver: imageLinkResolver,
+        inlineOnly: inlineOnly);
+    var passed = compareOutput(html, result);
+
+    if (!passed) {
+      // Remove trailing newline.
+      html = html.substring(0, html.length - 1);
+
+      var sb = new StringBuffer();
+      sb.writeln('Expected: ${html.replaceAll("\n", "\n          ")}');
+      sb.writeln('  Actual: ${result.replaceAll("\n", "\n          ")}');
+
+      fail(sb.toString());
+    }
+  });
+}
+
+/// Does a loose comparison of the two strings of HTML. Ignores differences in
+/// newlines and indentation.
+bool compareOutput(String a, String b) {
+  int i = 0;
+  int j = 0;
+
+  skipIgnored(String s, int i) {
+    // Ignore newlines.
+    while ((i < s.length) && (s[i] == '\n')) {
+      i++;
+      // Ignore indentation.
+      while ((i < s.length) && (s[i] == ' ')) i++;
+    }
+
+    return i;
+  }
+
+  while (true) {
+    i = skipIgnored(a, i);
+    j = skipIgnored(b, j);
+
+    // If one string runs out of non-ignored strings, the other must too.
+    if (i == a.length) return j == b.length;
+    if (j == b.length) return i == a.length;
+
+    if (a[i] != b[j]) return false;
+    i++;
+    j++;
+  }
+}