зеркало из https://github.com/mozilla/gecko-dev.git
114 строки
3.5 KiB
C++
114 строки
3.5 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "ViewportMetaData.h"
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using namespace mozilla;
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using namespace mozilla::dom;
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/*
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* Helper function for ViewportMetaData::ProcessViewportInfo.
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*
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* Handles a single key=value pair. If it corresponds to a valid viewport
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* attribute, add it to the document header data. No validation is done on the
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* value itself (this is done at display time).
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*/
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static void ProcessViewportToken(ViewportMetaData& aData,
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const nsAString& token) {
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/* Iterators. */
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nsAString::const_iterator tip, tail, end;
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token.BeginReading(tip);
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tail = tip;
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token.EndReading(end);
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/* Move tip to the '='. */
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while ((tip != end) && (*tip != '=')) {
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++tip;
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}
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/* If we didn't find an '=', punt. */
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if (tip == end) {
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return;
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}
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/* Extract the key and value. */
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const nsAString& key = nsContentUtils::TrimWhitespace<nsCRT::IsAsciiSpace>(
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Substring(tail, tip), true);
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const nsAString& value = nsContentUtils::TrimWhitespace<nsCRT::IsAsciiSpace>(
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Substring(++tip, end), true);
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/* Check for known keys. If we find a match, insert the appropriate
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* information into the document header. */
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RefPtr<nsAtom> key_atom = NS_Atomize(key);
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if (key_atom == nsGkAtoms::height) {
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aData.mHeight.Assign(value);
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} else if (key_atom == nsGkAtoms::width) {
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aData.mWidth.Assign(value);
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} else if (key_atom == nsGkAtoms::initial_scale) {
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aData.mInitialScale.Assign(value);
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} else if (key_atom == nsGkAtoms::minimum_scale) {
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aData.mMinimumScale.Assign(value);
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} else if (key_atom == nsGkAtoms::maximum_scale) {
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aData.mMaximumScale.Assign(value);
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} else if (key_atom == nsGkAtoms::user_scalable) {
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aData.mUserScalable.Assign(value);
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} else if (key_atom == nsGkAtoms::viewport_fit) {
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aData.mViewportFit.Assign(value);
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}
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}
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#define IS_SEPARATOR(c) \
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(((c) == '=') || ((c) == ',') || ((c) == ';') || ((c) == '\t') || \
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((c) == '\n') || ((c) == '\r'))
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ViewportMetaData::ViewportMetaData(const nsAString& aViewportInfo) {
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/* Iterators. */
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nsAString::const_iterator tip, tail, end;
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aViewportInfo.BeginReading(tip);
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tail = tip;
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aViewportInfo.EndReading(end);
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/* Read the tip to the first non-separator character. */
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while ((tip != end) && (IS_SEPARATOR(*tip) || nsCRT::IsAsciiSpace(*tip))) {
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++tip;
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}
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/* Read through and find tokens separated by separators. */
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while (tip != end) {
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/* Synchronize tip and tail. */
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tail = tip;
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/* Advance tip past non-separator characters. */
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while ((tip != end) && !IS_SEPARATOR(*tip)) {
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++tip;
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}
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/* Allow white spaces that surround the '=' character */
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if ((tip != end) && (*tip == '=')) {
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++tip;
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while ((tip != end) && nsCRT::IsAsciiSpace(*tip)) {
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++tip;
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}
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while ((tip != end) &&
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!(IS_SEPARATOR(*tip) || nsCRT::IsAsciiSpace(*tip))) {
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++tip;
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}
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}
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/* Our token consists of the characters between tail and tip. */
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ProcessViewportToken(*this, Substring(tail, tip));
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/* Skip separators. */
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while ((tip != end) && (IS_SEPARATOR(*tip) || nsCRT::IsAsciiSpace(*tip))) {
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++tip;
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}
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}
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}
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#undef IS_SEPARATOR
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