1 files changed, 241 insertions, 0 deletions
diff --git a/dom/base/WindowFeatures.cpp b/dom/base/WindowFeatures.cpp
new file mode 100644
index 0000000000..5de62f8b59
--- /dev/null
+++ b/dom/base/WindowFeatures.cpp
@@ -0,0 +1,241 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "WindowFeatures.h"
+
+#include "nsINode.h"               // IsSpaceCharacter
+#include "nsContentUtils.h"        // nsContentUtils
+#include "nsDependentSubstring.h"  // Substring
+#include "nsReadableUtils.h"       // ToLowerCase
+
+using mozilla::dom::IsSpaceCharacter;
+using mozilla::dom::WindowFeatures;
+
+#ifdef DEBUG
+/* static */
+bool WindowFeatures::IsLowerCase(const char* text) {
+  nsAutoCString before(text);
+  nsAutoCString after;
+  ToLowerCase(before, after);
+  return before == after;
+}
+#endif
+
+static bool IsFeatureSeparator(char aChar) {
+  // https://html.spec.whatwg.org/multipage/window-object.html#feature-separator
+  // A code point is a feature separator if it is ASCII whitespace, U+003D (=),
+  // or U+002C (,).
+  return IsSpaceCharacter(aChar) || aChar == '=' || aChar == ',';
+}
+
+template <class IterT, class CondT>
+void AdvanceWhile(IterT& aPosition, const IterT& aEnd, CondT aCondition) {
+  // https://infra.spec.whatwg.org/#collect-a-sequence-of-code-points
+  //
+  // Step 2. While `position` doesn’t point past the end of `input` and the
+  // code point at `position` within `input` meets the condition condition:
+  while (aCondition(*aPosition) && aPosition < aEnd) {
+    // Step 2.1. Append that code point to the end of `result`.
+    // (done by caller)
+
+    // Step 2.2. Advance `position` by 1.
+    ++aPosition;
+  }
+}
+
+template <class IterT, class CondT>
+nsTDependentSubstring<char> CollectSequence(IterT& aPosition, const IterT& aEnd,
+                                            CondT aCondition) {
+  // https://infra.spec.whatwg.org/#collect-a-sequence-of-code-points
+  // To collect a sequence of code points meeting a condition `condition` from
+  // a string `input`, given a position variable `position` tracking the
+  // position of the calling algorithm within `input`:
+
+  // Step 1. Let `result` be the empty string.
+  auto start = aPosition;
+
+  // Step 2.
+  AdvanceWhile(aPosition, aEnd, aCondition);
+
+  // Step 3. Return `result`.
+  return Substring(start, aPosition);
+}
+
+static void NormalizeName(nsAutoCString& aName) {
+  // https://html.spec.whatwg.org/multipage/window-object.html#normalizing-the-feature-name
+  if (aName == "screenx") {
+    aName = "left";
+  } else if (aName == "screeny") {
+    aName = "top";
+  } else if (aName == "innerwidth") {
+    aName = "width";
+  } else if (aName == "innerheight") {
+    aName = "height";
+  }
+}
+
+/* static */
+int32_t WindowFeatures::ParseIntegerWithFallback(const nsCString& aValue) {
+  // https://html.spec.whatwg.org/multipage/window-object.html#concept-window-open-features-parse-boolean
+  //
+  // Step 3. Let `parsed` be the result of parsing value as an integer.
+  nsContentUtils::ParseHTMLIntegerResultFlags parseResult;
+  int32_t parsed = nsContentUtils::ParseHTMLInteger(aValue, &parseResult);
+
+  // Step 4. If `parsed` is an error, then set it to 0.
+  //
+  // https://html.spec.whatwg.org/multipage/common-microsyntaxes.html#rules-for-parsing-integers
+  //
+  // eParseHTMLInteger_NonStandard is not tested given:
+  //   * Step 4 allows leading whitespaces
+  //   * Step 6 allows a plus sign
+  //   * Step 8 does not disallow leading zeros
+  //   * Steps 6 and 9 allow `-0`
+  //
+  // eParseHTMLInteger_DidNotConsumeAllInput is not tested given:
+  //   * Step 8 collects digits and ignores remaining part
+  //
+  if (parseResult & nsContentUtils::eParseHTMLInteger_Error) {
+    parsed = 0;
+  }
+
+  return parsed;
+}
+
+/* static */
+bool WindowFeatures::ParseBool(const nsCString& aValue) {
+  // https://html.spec.whatwg.org/multipage/window-object.html#concept-window-open-features-parse-boolean
+  // To parse a boolean feature given a string `value`:
+
+  // Step 1. If `value` is the empty string, then return true.
+  if (aValue.IsEmpty()) {
+    return true;
+  }
+
+  // Step 2. If `value` is "yes", then return true.
+  if (aValue == "yes") {
+    return true;
+  }
+
+  // Step 3. If `value` is "true", then return
+  if (aValue == "true") {
+    return true;
+  }
+
+  // Steps 4-5.
+  int32_t parsed = ParseIntegerWithFallback(aValue);
+
+  // Step 6. Return false if `parsed` is 0, and true otherwise.
+  return parsed != 0;
+}
+
+bool WindowFeatures::Tokenize(const nsACString& aFeatures) {
+  // https://html.spec.whatwg.org/multipage/window-object.html#concept-window-open-features-tokenize
+  // To tokenize the `features` argument:
+
+  // Step 1. Let `tokenizedFeatures` be a new ordered map.
+  // (implicit)
+
+  // Step 2. Let `position` point at the first code point of features.
+  auto position = aFeatures.BeginReading();
+
+  // Step 3. While `position` is not past the end of `features`:
+  auto end = aFeatures.EndReading();
+  while (position < end) {
+    // Step 3.1. Let `name` be the empty string.
+    // (implicit)
+
+    // Step 3.2. Let `value` be the empty string.
+    nsAutoCString value;
+
+    // Step 3.3. Collect a sequence of code points that are feature separators
+    // from `features` given `position`. This skips past leading separators
+    // before the name.
+    //
+    // NOTE: Do not collect given this value is unused.
+    AdvanceWhile(position, end, IsFeatureSeparator);
+
+    // Step 3.4. Collect a sequence of code points that are not feature
+    // separators from `features` given `position`. Set `name` to the collected
+    // characters, converted to ASCII lowercase.
+    nsAutoCString name(CollectSequence(
+        position, end, [](char c) { return !IsFeatureSeparator(c); }));
+    ToLowerCase(name);
+
+    // Step 3.5. Set `name` to the result of normalizing the feature name
+    // `name`.
+    NormalizeName(name);
+
+    // Step 3.6. While `position` is not past the end of `features` and the
+    // code point at `position` in features is not U+003D (=):
+    //
+    // Step 3.6.1. If the code point at `position` in features is U+002C (,),
+    // or if it is not a feature separator, then break.
+    //
+    // Step 3.6.2. Advance `position` by 1.
+    //
+    // NOTE: This skips to the first U+003D (=) but does not skip past a U+002C
+    //       (,) or a non-separator.
+    //
+    // The above means skip all whitespaces.
+    AdvanceWhile(position, end, [](char c) { return IsSpaceCharacter(c); });
+
+    // Step 3.7. If the code point at `position` in `features` is a feature
+    // separator:
+    if (position < end && IsFeatureSeparator(*position)) {
+      // Step 3.7.1. While `position` is not past the end of `features` and the
+      // code point at `position` in `features` is a feature separator:
+      //
+      // Step 3.7.1.1. If the code point at `position` in `features` is
+      // U+002C (,), then break.
+      //
+      // Step 3.7.1.2. Advance `position` by 1.
+      //
+      // NOTE: This skips to the first non-separator but does not skip past a
+      // U+002C (,).
+      AdvanceWhile(position, end,
+                   [](char c) { return IsFeatureSeparator(c) && c != ','; });
+
+      // Step 3.7.2. Collect a sequence of code points that are not feature
+      // separators code points from `features` given `position`. Set `value` to
+      // the collected code points, converted to ASCII lowercase.
+      value = CollectSequence(position, end,
+                              [](char c) { return !IsFeatureSeparator(c); });
+      ToLowerCase(value);
+    }
+
+    // Step 3.8. If `name` is not the empty string, then set
+    // `tokenizedFeatures[name]` to `value`.
+    if (!name.IsEmpty()) {
+      if (!tokenizedFeatures_.put(name, value)) {
+        return false;
+      }
+    }
+  }
+
+  // Step 4. Return `tokenizedFeatures`.
+  return true;
+}
+
+void WindowFeatures::Stringify(nsAutoCString& aOutput) {
+  MOZ_ASSERT(aOutput.IsEmpty());
+
+  for (auto r = tokenizedFeatures_.all(); !r.empty(); r.popFront()) {
+    if (!aOutput.IsEmpty()) {
+      aOutput.Append(',');
+    }
+
+    const nsCString& name = r.front().key();
+    const nsCString& value = r.front().value();
+
+    aOutput.Append(name);
+
+    if (!value.IsEmpty()) {
+      aOutput.Append('=');
+      aOutput.Append(value);
+    }
+  }
+}