зеркало из https://github.com/mozilla/gecko-dev.git
604 строки
15 KiB
C++
604 строки
15 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is the Mozilla SMIL module.
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*
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* The Initial Developer of the Original Code is Brian Birtles.
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* Portions created by the Initial Developer are Copyright (C) 2005
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Brian Birtles <birtles@gmail.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsSMILParserUtils.h"
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#include "nsISMILAttr.h"
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#include "nsSMILValue.h"
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#include "nsSMILTimeValue.h"
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#include "nsSMILTypes.h"
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#include "nsSMILRepeatCount.h"
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#include "nsString.h"
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#include "prdtoa.h"
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#include "nsCRT.h"
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#include "nsCOMPtr.h"
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#include "prlong.h"
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const PRUint32 nsSMILParserUtils::MSEC_PER_SEC = 1000;
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const PRUint32 nsSMILParserUtils::MSEC_PER_MIN = 1000 * 60;
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const PRUint32 nsSMILParserUtils::MSEC_PER_HOUR = 1000 * 60 * 60;
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//------------------------------------------------------------------------------
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// Inlines
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// NS_IS_SPACE relies on isspace which may return true for \xB and \xC but
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// SMILANIM does not consider these characters to be whitespace.
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inline PRBool
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nsSMILParserUtils::IsSpace(const PRUnichar c)
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{
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return (c == 0x9 || c == 0xA || c == 0xD || c == 0x20);
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}
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inline void
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nsSMILParserUtils::SkipWsp(nsACString::const_iterator& aIter,
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const nsACString::const_iterator& aIterEnd)
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{
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while (aIter != aIterEnd && IsSpace(*aIter)) {
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++aIter;
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}
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}
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inline void
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nsSMILParserUtils::SkipWsp(nsAString::const_iterator& aIter,
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const nsAString::const_iterator& aIterEnd)
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{
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while (aIter != aIterEnd && IsSpace(*aIter)) {
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++aIter;
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}
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}
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inline double
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nsSMILParserUtils::GetFloat(nsACString::const_iterator& aIter,
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const nsACString::const_iterator& aIterEnd,
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nsresult *aErrorCode)
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{
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char *end;
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const char *start = aIter.get();
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double value = PR_strtod(start, &end);
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nsresult rv = NS_OK;
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if (end == start || end > aIterEnd.get()) {
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rv = NS_ERROR_FAILURE;
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} else {
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aIter.advance(end - start);
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}
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if (aErrorCode) {
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*aErrorCode = rv;
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}
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return value;
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}
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inline PRBool
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nsSMILParserUtils::ConsumeSubstring(nsACString::const_iterator& aIter,
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const nsACString::const_iterator& aIterEnd,
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const char *aSubstring)
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{
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size_t substrLen = PL_strlen(aSubstring);
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typedef nsACString::const_iterator::difference_type diff_type;
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if (aIterEnd.get() - aIter.get() < static_cast<diff_type>(substrLen))
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return PR_FALSE;
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PRBool result = PR_FALSE;
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if (PL_strstr(aIter.get(), aSubstring) == aIter.get()) {
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aIter.advance(substrLen);
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result = PR_TRUE;
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}
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return result;
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}
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//------------------------------------------------------------------------------
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// Implementation
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nsresult
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nsSMILParserUtils::ParseKeySplines(const nsAString& aSpec,
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nsTArray<double>& aSplineArray)
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{
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nsresult rv = NS_OK;
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NS_ConvertUTF16toUTF8 spec(aSpec);
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nsACString::const_iterator start, end;
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spec.BeginReading(start);
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spec.EndReading(end);
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SkipWsp(start, end);
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int i = 0;
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while (start != end)
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{
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double value = GetFloat(start, end, &rv);
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if (NS_FAILED(rv))
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break;
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if (value > 1.0 || value < 0.0) {
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rv = NS_ERROR_FAILURE;
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break;
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}
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if (!aSplineArray.AppendElement(value)) {
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rv = NS_ERROR_OUT_OF_MEMORY;
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break;
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}
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++i;
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SkipWsp(start, end);
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if (start == end)
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break;
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if (i % 4) {
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if (*start == ',') {
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++start;
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}
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} else {
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if (*start != ';') {
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rv = NS_ERROR_FAILURE;
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break;
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}
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++start;
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}
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SkipWsp(start, end);
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}
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if (i % 4) {
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rv = NS_ERROR_FAILURE; // wrong number of points
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}
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return rv;
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}
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nsresult
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nsSMILParserUtils::ParseKeyTimes(const nsAString& aSpec,
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nsTArray<double>& aTimeArray)
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{
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nsresult rv = NS_OK;
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NS_ConvertUTF16toUTF8 spec(aSpec);
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nsACString::const_iterator start, end;
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spec.BeginReading(start);
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spec.EndReading(end);
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SkipWsp(start, end);
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double previousValue = -1.0;
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while (start != end) {
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double value = GetFloat(start, end, &rv);
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if (NS_FAILED(rv))
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break;
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if (value > 1.0 || value < 0.0 || value < previousValue) {
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rv = NS_ERROR_FAILURE;
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break;
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}
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if (!aTimeArray.AppendElement(value)) {
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rv = NS_ERROR_OUT_OF_MEMORY;
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break;
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}
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previousValue = value;
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SkipWsp(start, end);
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if (start == end)
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break;
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if (*start++ != ';') {
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rv = NS_ERROR_FAILURE;
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break;
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}
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SkipWsp(start, end);
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}
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return rv;
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}
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nsresult
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nsSMILParserUtils::ParseValues(const nsAString& aSpec,
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const nsISMILAnimationElement* aSrcElement,
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const nsISMILAttr& aAttribute,
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nsTArray<nsSMILValue>& aValuesArray)
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{
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nsresult rv = NS_ERROR_FAILURE;
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nsAString::const_iterator start;
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nsAString::const_iterator end;
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nsAString::const_iterator substr_end;
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nsAString::const_iterator next;
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aSpec.BeginReading(start);
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aSpec.EndReading(end);
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while (start != end) {
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rv = NS_ERROR_FAILURE;
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SkipWsp(start, end);
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if (start == end || *start == ';')
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break;
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substr_end = start;
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while (substr_end != end && *substr_end != ';') {
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++substr_end;
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}
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next = substr_end;
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if (*substr_end == ';') {
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++next;
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if (next == end)
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break;
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}
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do --substr_end; while (start != substr_end && NS_IS_SPACE(*substr_end));
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++substr_end;
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nsSMILValue newValue;
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rv = aAttribute.ValueFromString(Substring(start, substr_end),
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aSrcElement, newValue);
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if (NS_FAILED(rv))
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break;
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if (!aValuesArray.AppendElement(newValue)) {
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rv = NS_ERROR_OUT_OF_MEMORY;
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break;
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}
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rv = NS_OK;
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start = next;
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}
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return rv;
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}
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nsresult
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nsSMILParserUtils::ParseRepeatCount(const nsAString& aSpec,
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nsSMILRepeatCount& aResult)
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{
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nsresult rv = NS_OK;
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NS_ConvertUTF16toUTF8 spec(aSpec);
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nsACString::const_iterator start, end;
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spec.BeginReading(start);
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spec.EndReading(end);
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SkipWsp(start, end);
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if (start != end)
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{
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if (ConsumeSubstring(start, end, "indefinite")) {
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aResult.SetIndefinite();
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} else {
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double value = GetFloat(start, end, &rv);
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if (NS_SUCCEEDED(rv))
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{
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/* Repeat counts must be > 0 */
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if (value <= 0.0) {
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rv = NS_ERROR_FAILURE;
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} else {
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aResult = value;
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}
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}
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}
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/* Check for trailing junk */
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SkipWsp(start, end);
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if (start != end) {
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rv = NS_ERROR_FAILURE;
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}
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} else {
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/* Empty spec */
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rv = NS_ERROR_FAILURE;
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}
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if (NS_FAILED(rv)) {
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aResult.Unset();
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}
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return rv;
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}
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nsresult
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nsSMILParserUtils::ParseClockValue(const nsAString& aSpec,
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nsSMILTimeValue* aResult,
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PRUint32 aFlags, // = 0
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PRBool* aIsMedia) // = nsnull
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{
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nsSMILTime offset = 0L;
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double component = 0.0;
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PRInt8 sign = 0;
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PRUint8 colonCount = 0;
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PRBool started = PR_FALSE;
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PRBool isValid = PR_TRUE;
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PRInt32 metricMultiplicand = MSEC_PER_SEC;
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PRBool numIsReal = PR_FALSE;
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PRBool prevNumCouldBeMin = PR_FALSE;
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PRBool numCouldBeMin = PR_FALSE;
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PRBool numCouldBeSec = PR_FALSE;
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PRBool isIndefinite = PR_FALSE;
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if (aIsMedia) {
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*aIsMedia = PR_FALSE;
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}
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NS_ConvertUTF16toUTF8 spec(aSpec);
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nsACString::const_iterator start, end;
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spec.BeginReading(start);
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spec.EndReading(end);
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while (start != end) {
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if (IsSpace(*start)) {
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if (started) {
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++start;
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break;
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}
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// else, we haven't started yet, ignore initial whitespace
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++start;
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} else if ((aFlags & kClockValueAllowSign)
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&& (*start == '+' || *start == '-')) {
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if (sign != 0) {
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// sign has already been set
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isValid = PR_FALSE;
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break;
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}
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if (started) {
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// sign appears in the middle of the string
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isValid = PR_FALSE;
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break;
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}
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sign = (*start == '+') ? 1 : -1;
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++start;
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// The NS_IS_DIGIT etc. macros are not locale-specific
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} else if (NS_IS_DIGIT(*start)) {
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prevNumCouldBeMin = numCouldBeMin;
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if (!ParseClockComponent(start, end, component, numIsReal, numCouldBeMin,
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numCouldBeSec)) {
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isValid = PR_FALSE;
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break;
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}
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started = PR_TRUE;
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} else if (*start == ':') {
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++colonCount;
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// Neither minutes nor hours can be reals
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if (numIsReal) {
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isValid = PR_FALSE;
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break;
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}
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// Clock value can't start with a ':'
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if (!started) {
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isValid = PR_FALSE;
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break;
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}
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// Can't have more than two colons
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if (colonCount > 2) {
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isValid = PR_FALSE;
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break;
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}
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// Multiply the offset by 60 and add the last accumulated component
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offset = offset * 60 + PRInt64(component);
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component = 0.0;
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++start;
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} else if (NS_IS_ALPHA(*start)) {
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if (colonCount > 0) {
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isValid = PR_FALSE;
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break;
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}
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if ((aFlags & kClockValueAllowIndefinite)
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&& ConsumeSubstring(start, end, "indefinite")) {
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// We set a separate flag because we don't know what the state of the
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// passed in time value is and we shouldn't change it in the case of a
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// bad input string (so we can't initialise it to 0ms for example).
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isIndefinite = PR_TRUE;
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if (aResult) {
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aResult->SetIndefinite();
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}
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} else if (aIsMedia && ConsumeSubstring(start, end, "media")) {
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*aIsMedia = PR_TRUE;
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} else if (!ParseMetricMultiplicand(start, end, metricMultiplicand)) {
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isValid = PR_FALSE;
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break;
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}
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// Nothing must come after the string except whitespace
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break;
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} else {
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isValid = PR_FALSE;
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break;
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}
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}
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if (!started) {
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isValid = PR_FALSE;
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}
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// Process remainder of string (if any) to ensure it is only trailing
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// whitespace (embedded whitespace is not allowed)
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SkipWsp(start, end);
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if (start != end) {
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isValid = PR_FALSE;
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}
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// No more processing required if the value was "indefinite" or "media".
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if (isIndefinite || (aIsMedia && *aIsMedia))
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return NS_OK;
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// If there is more than one colon then the previous component must be a
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// correctly formatted minute (i.e. two digits between 00 and 59) and the
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// latest component must be a correctly formatted second (i.e. two digits
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// before the .)
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if (colonCount > 0 && (!prevNumCouldBeMin || !numCouldBeSec)) {
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isValid = PR_FALSE;
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}
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if (isValid) {
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// Tack on the last component
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if (colonCount > 0) {
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offset = offset * 60 * 1000;
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component *= 1000;
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// rounding
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component = (component >= 0) ? component + 0.5 : component - 0.5;
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offset += PRInt64(component);
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} else {
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component *= metricMultiplicand;
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// rounding
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component = (component >= 0) ? component + 0.5 : component - 0.5;
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offset = PRInt64(component);
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}
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if (aResult) {
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nsSMILTime millis = offset;
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if (sign == -1) {
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millis = -offset;
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}
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aResult->SetMillis(millis);
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}
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}
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return (isValid) ? NS_OK : NS_ERROR_FAILURE;
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}
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PRBool
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nsSMILParserUtils::ParseClockComponent(nsACString::const_iterator& aSpec,
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const nsACString::const_iterator& aEnd,
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double& aResult,
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PRBool& aIsReal,
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PRBool& aCouldBeMin,
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PRBool& aCouldBeSec)
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{
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nsresult rv;
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char const *begin = aSpec.get();
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double value = GetFloat(aSpec, aEnd, &rv);
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// Check a number was found
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if (NS_FAILED(rv))
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return PR_FALSE;
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// Check it's not expressed in exponential form
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size_t len = aSpec.get() - begin;
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PRBool isExp = (PL_strnpbrk(begin, "eE", len) != nsnull);
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if (isExp)
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return PR_FALSE;
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// Don't allow real numbers of the form "23."
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if (*(aSpec.get() - 1) == '.')
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return PR_FALSE;
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// Number looks good
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aResult = value;
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// Set some flags so we can check this number is valid once we know
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// whether it's an hour, minute string etc.
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aIsReal = (PL_strnchr(begin, '.', len) != nsnull);
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aCouldBeMin = (value < 60.0 && (len == 2));
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aCouldBeSec = (value < 60.0 ||
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(value == 60.0 && begin[0] == '5')); // Take care of rounding error
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aCouldBeSec &= (len >= 2 &&
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(begin[2] == '\0' || begin[2] == '.' || IsSpace(begin[2])));
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return PR_TRUE;
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}
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inline PRBool
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nsSMILParserUtils::ParseMetricMultiplicand(nsACString::const_iterator& aSpec,
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const nsACString::const_iterator& aEnd,
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PRInt32& multiplicand)
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{
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PRBool result = PR_FALSE;
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size_t len = aEnd.get() - aSpec.get();
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nsACString::const_iterator spec(aSpec);
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|
if (len) {
|
|
switch (*spec++)
|
|
{
|
|
case 'h':
|
|
multiplicand = MSEC_PER_HOUR;
|
|
result = PR_TRUE;
|
|
break;
|
|
case 'm':
|
|
if (len >= 2) {
|
|
if (*spec == 's') {
|
|
++spec;
|
|
multiplicand = 1;
|
|
result = PR_TRUE;
|
|
} else if (len >= 3 && *spec++ == 'i' && *spec++ == 'n') {
|
|
multiplicand = MSEC_PER_MIN;
|
|
result = PR_TRUE;
|
|
}
|
|
}
|
|
break;
|
|
case 's':
|
|
multiplicand = MSEC_PER_SEC;
|
|
result = PR_TRUE;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (result) {
|
|
aSpec = spec;
|
|
}
|
|
|
|
return result;
|
|
}
|