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gecko/content/smil/nsSMILParserUtils.cpp

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