diff options
Diffstat (limited to '')
-rw-r--r-- | dom/base/ViewportMetaData.cpp | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/dom/base/ViewportMetaData.cpp b/dom/base/ViewportMetaData.cpp new file mode 100644 index 0000000000..2646621629 --- /dev/null +++ b/dom/base/ViewportMetaData.cpp @@ -0,0 +1,115 @@ +/* -*- 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 "nsContentUtils.h" +#include "nsCRT.h" +#include "ViewportMetaData.h" + +using namespace mozilla; +using namespace mozilla::dom; + +/* + * Helper function for ViewportMetaData::ProcessViewportInfo. + * + * Handles a single key=value pair. If it corresponds to a valid viewport + * attribute, add it to the document header data. No validation is done on the + * value itself (this is done at display time). + */ +static void ProcessViewportToken(ViewportMetaData& aData, + const nsAString& token) { + /* Iterators. */ + nsAString::const_iterator tip, tail, end; + token.BeginReading(tip); + tail = tip; + token.EndReading(end); + + /* Move tip to the '='. */ + while ((tip != end) && (*tip != '=')) { + ++tip; + } + + /* If we didn't find an '=', punt. */ + if (tip == end) { + return; + } + + /* Extract the key and value. */ + const nsAString& key = nsContentUtils::TrimWhitespace<nsCRT::IsAsciiSpace>( + Substring(tail, tip), true); + const nsAString& value = nsContentUtils::TrimWhitespace<nsCRT::IsAsciiSpace>( + Substring(++tip, end), true); + + /* Check for known keys. If we find a match, insert the appropriate + * information into the document header. */ + RefPtr<nsAtom> key_atom = NS_Atomize(key); + if (key_atom == nsGkAtoms::height) { + aData.mHeight.Assign(value); + } else if (key_atom == nsGkAtoms::width) { + aData.mWidth.Assign(value); + } else if (key_atom == nsGkAtoms::initial_scale) { + aData.mInitialScale.Assign(value); + } else if (key_atom == nsGkAtoms::minimum_scale) { + aData.mMinimumScale.Assign(value); + } else if (key_atom == nsGkAtoms::maximum_scale) { + aData.mMaximumScale.Assign(value); + } else if (key_atom == nsGkAtoms::user_scalable) { + aData.mUserScalable.Assign(value); + } else if (key_atom == nsGkAtoms::viewport_fit) { + aData.mViewportFit.Assign(value); + } +} + +#define IS_SEPARATOR(c) \ + (((c) == '=') || ((c) == ',') || ((c) == ';') || ((c) == '\t') || \ + ((c) == '\n') || ((c) == '\r')) + +ViewportMetaData::ViewportMetaData(const nsAString& aViewportInfo) { + /* Iterators. */ + nsAString::const_iterator tip, tail, end; + aViewportInfo.BeginReading(tip); + tail = tip; + aViewportInfo.EndReading(end); + + /* Read the tip to the first non-separator character. */ + while ((tip != end) && (IS_SEPARATOR(*tip) || nsCRT::IsAsciiSpace(*tip))) { + ++tip; + } + + /* Read through and find tokens separated by separators. */ + while (tip != end) { + /* Synchronize tip and tail. */ + tail = tip; + + /* Advance tip past non-separator characters. */ + while ((tip != end) && !IS_SEPARATOR(*tip)) { + ++tip; + } + + /* Allow white spaces that surround the '=' character */ + if ((tip != end) && (*tip == '=')) { + ++tip; + + while ((tip != end) && nsCRT::IsAsciiSpace(*tip)) { + ++tip; + } + + while ((tip != end) && + !(IS_SEPARATOR(*tip) || nsCRT::IsAsciiSpace(*tip))) { + ++tip; + } + } + + /* Our token consists of the characters between tail and tip. */ + ProcessViewportToken(*this, Substring(tail, tip)); + + /* Skip separators. */ + while ((tip != end) && (IS_SEPARATOR(*tip) || nsCRT::IsAsciiSpace(*tip))) { + ++tip; + } + } +} + +#undef IS_SEPARATOR |