PRInt32
nsSMILParserUtils::CheckForNegativeNumber(const nsAString& aStr)
{
PRInt32 absValLocation = -1;
nsAString::const_iterator start, end;
aStr.BeginReading(start);
aStr.EndReading(end);
// Skip initial whitespace
SkipBeginWsp(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;
}
nsresult
nsSMILParserUtils::ParseClockValue(const nsAString& aSpec,
nsSMILTimeValue* aResult,
PRUint32 aFlags, // = 0
bool* aIsMedia) // = nullptr
{
nsSMILTime offset = 0L;
double component = 0.0;
PRInt8 sign = 0;
PRUint8 colonCount = 0;
// Indicates we have started parsing a clock-value (not including the optional
// +/- that precedes the clock-value) or keyword ("media", "indefinite")
bool started = false;
PRInt32 metricMultiplicand = MSEC_PER_SEC;
bool numIsReal = false;
bool prevNumCouldBeMin = false;
bool numCouldBeMin = false;
bool numCouldBeSec = false;
bool isIndefinite = false;
if (aIsMedia) {
*aIsMedia = false;
}
NS_ConvertUTF16toUTF8 spec(aSpec);
const char* start = spec.BeginReading();
const char* end = spec.EndReading();
while (start != end) {
if (IsSpace(*start)) {
++start;
if (started) {
break;
}
} else if (!started && (aFlags & kClockValueAllowSign) &&
(*start == '+' || *start == '-')) {
// check sign has not already been set (e.g. ++10s)
if (sign != 0) {
return NS_ERROR_FAILURE;
}
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)) {
return NS_ERROR_FAILURE;
}
started = true;
} else if (started && *start == ':') {
++colonCount;
// Neither minutes nor hours can be reals
if (numIsReal) {
return NS_ERROR_FAILURE;
}
// Can't have more than two colons
if (colonCount > 2) {
return NS_ERROR_FAILURE;
}
// Multiply the offset by 60 and add the last accumulated component
offset = offset * 60 + nsSMILTime(component);
component = 0.0;
++start;
} else if (NS_IS_ALPHA(*start)) {
if (colonCount > 0) {
return NS_ERROR_FAILURE;
}
if (!started && (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 = true;
if (aResult) {
aResult->SetIndefinite();
}
started = true;
} else if (!started && aIsMedia &&
ConsumeSubstring(start, end, "media")) {
*aIsMedia = true;
started = true;
} else if (!ParseMetricMultiplicand(start, end, metricMultiplicand)) {
return NS_ERROR_FAILURE;
}
// Nothing must come after the string except whitespace
break;
} else {
return NS_ERROR_FAILURE;
}
}
// Whitespace/empty string
if (!started) {
return NS_ERROR_FAILURE;
}
// Process remainder of string (if any) to ensure it is only trailing
// whitespace (embedded whitespace is not allowed)
SkipBeginWsp(start, end);
if (start != end) {
return NS_ERROR_FAILURE;
}
// 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)) {
return NS_ERROR_FAILURE;
}
// Tack on the last component
if (colonCount > 0) {
offset *= 60 * 1000;
component *= 1000;
// rounding
component = (component >= 0) ? component + 0.5 : component - 0.5;
offset += nsSMILTime(component);
} else {
component *= metricMultiplicand;
// rounding
component = (component >= 0) ? component + 0.5 : component - 0.5;
offset = nsSMILTime(component);
}
// we haven't applied the sign yet so if the result is negative we must have
// overflowed
if (offset < 0) {
return NS_ERROR_FAILURE;
}
if (aResult) {
if (sign == -1) {
offset = -offset;
}
aResult->SetMillis(offset);
}
return NS_OK;
}
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;
}
