| /* |
| * Copyright (C) 2002, 2003 The Karbon Developers |
| * Copyright (C) 2006 Alexander Kellett <lypanov@kde.org> |
| * Copyright (C) 2006, 2007 Rob Buis <buis@kde.org> |
| * Copyright (C) 2007-2018 Apple Inc. All rights reserved. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| */ |
| |
| #include "config.h" |
| #include "SVGParserUtilities.h" |
| |
| #include "Document.h" |
| #include "FloatRect.h" |
| #include <limits> |
| #include <wtf/ASCIICType.h> |
| #include <wtf/text/StringView.h> |
| |
| namespace WebCore { |
| |
| template <typename FloatType> static inline bool isValidRange(const FloatType& x) |
| { |
| static const FloatType max = std::numeric_limits<FloatType>::max(); |
| return x >= -max && x <= max; |
| } |
| |
| // We use this generic parseNumber function to allow the Path parsing code to work |
| // at a higher precision internally, without any unnecessary runtime cost or code |
| // complexity. |
| template <typename CharacterType, typename FloatType> static bool genericParseNumber(const CharacterType*& ptr, const CharacterType* end, FloatType& number, bool skip) |
| { |
| FloatType integer, decimal, frac, exponent; |
| int sign, expsign; |
| const CharacterType* start = ptr; |
| |
| exponent = 0; |
| integer = 0; |
| frac = 1; |
| decimal = 0; |
| sign = 1; |
| expsign = 1; |
| |
| // read the sign |
| if (ptr < end && *ptr == '+') |
| ptr++; |
| else if (ptr < end && *ptr == '-') { |
| ptr++; |
| sign = -1; |
| } |
| |
| if (ptr == end || (!isASCIIDigit(*ptr) && *ptr != '.')) |
| return false; |
| |
| // read the integer part, build right-to-left |
| const CharacterType* ptrStartIntPart = ptr; |
| while (ptr < end && isASCIIDigit(*ptr)) |
| ++ptr; // Advance to first non-digit. |
| |
| if (ptr != ptrStartIntPart) { |
| const CharacterType* ptrScanIntPart = ptr - 1; |
| FloatType multiplier = 1; |
| while (ptrScanIntPart >= ptrStartIntPart) { |
| integer += multiplier * static_cast<FloatType>(*(ptrScanIntPart--) - '0'); |
| multiplier *= 10; |
| } |
| // Bail out early if this overflows. |
| if (!isValidRange(integer)) |
| return false; |
| } |
| |
| if (ptr < end && *ptr == '.') { // read the decimals |
| ptr++; |
| |
| // There must be a least one digit following the . |
| if (ptr >= end || !isASCIIDigit(*ptr)) |
| return false; |
| |
| while (ptr < end && isASCIIDigit(*ptr)) |
| decimal += (*(ptr++) - '0') * (frac *= static_cast<FloatType>(0.1)); |
| } |
| |
| // read the exponent part |
| if (ptr != start && ptr + 1 < end && (*ptr == 'e' || *ptr == 'E') |
| && (ptr[1] != 'x' && ptr[1] != 'm')) { |
| ptr++; |
| |
| // read the sign of the exponent |
| if (*ptr == '+') |
| ptr++; |
| else if (*ptr == '-') { |
| ptr++; |
| expsign = -1; |
| } |
| |
| // There must be an exponent |
| if (ptr >= end || !isASCIIDigit(*ptr)) |
| return false; |
| |
| while (ptr < end && isASCIIDigit(*ptr)) { |
| exponent *= static_cast<FloatType>(10); |
| exponent += *ptr - '0'; |
| ptr++; |
| } |
| // Make sure exponent is valid. |
| if (!isValidRange(exponent) || exponent > std::numeric_limits<FloatType>::max_exponent) |
| return false; |
| } |
| |
| number = integer + decimal; |
| number *= sign; |
| |
| if (exponent) |
| number *= static_cast<FloatType>(pow(10.0, expsign * static_cast<int>(exponent))); |
| |
| // Don't return Infinity() or NaN(). |
| if (!isValidRange(number)) |
| return false; |
| |
| if (start == ptr) |
| return false; |
| |
| if (skip) |
| skipOptionalSVGSpacesOrDelimiter(ptr, end); |
| |
| return true; |
| } |
| |
| template <typename CharacterType> |
| bool parseSVGNumber(CharacterType* begin, size_t length, double& number) |
| { |
| const CharacterType* ptr = begin; |
| const CharacterType* end = ptr + length; |
| return genericParseNumber(ptr, end, number, false); |
| } |
| |
| // Explicitly instantiate the two flavors of parseSVGNumber() to satisfy external callers |
| template bool parseSVGNumber(LChar* begin, size_t length, double&); |
| template bool parseSVGNumber(UChar* begin, size_t length, double&); |
| |
| bool parseNumber(const LChar*& ptr, const LChar* end, float& number, bool skip) |
| { |
| return genericParseNumber(ptr, end, number, skip); |
| } |
| |
| bool parseNumber(const UChar*& ptr, const UChar* end, float& number, bool skip) |
| { |
| return genericParseNumber(ptr, end, number, skip); |
| } |
| |
| bool parseNumberFromString(const String& string, float& number, bool skip) |
| { |
| auto upconvertedCharacters = StringView(string).upconvertedCharacters(); |
| const UChar* ptr = upconvertedCharacters; |
| const UChar* end = ptr + string.length(); |
| return genericParseNumber(ptr, end, number, skip) && ptr == end; |
| } |
| |
| // only used to parse largeArcFlag and sweepFlag which must be a "0" or "1" |
| // and might not have any whitespace/comma after it |
| template <typename CharacterType> |
| bool genericParseArcFlag(const CharacterType*& ptr, const CharacterType* end, bool& flag) |
| { |
| if (ptr >= end) |
| return false; |
| const CharacterType flagChar = *ptr++; |
| if (flagChar == '0') |
| flag = false; |
| else if (flagChar == '1') |
| flag = true; |
| else |
| return false; |
| |
| skipOptionalSVGSpacesOrDelimiter(ptr, end); |
| |
| return true; |
| } |
| |
| bool parseArcFlag(const LChar*& ptr, const LChar* end, bool& flag) |
| { |
| return genericParseArcFlag(ptr, end, flag); |
| } |
| |
| bool parseArcFlag(const UChar*& ptr, const UChar* end, bool& flag) |
| { |
| return genericParseArcFlag(ptr, end, flag); |
| } |
| |
| bool parseNumberOptionalNumber(const String& s, float& x, float& y) |
| { |
| if (s.isEmpty()) |
| return false; |
| |
| auto upconvertedCharacters = StringView(s).upconvertedCharacters(); |
| const UChar* cur = upconvertedCharacters; |
| const UChar* end = cur + s.length(); |
| |
| if (!parseNumber(cur, end, x)) |
| return false; |
| |
| if (cur == end) |
| y = x; |
| else if (!parseNumber(cur, end, y, false)) |
| return false; |
| |
| return cur == end; |
| } |
| |
| bool parsePoint(const String& s, FloatPoint& point) |
| { |
| if (s.isEmpty()) |
| return false; |
| auto upconvertedCharacters = StringView(s).upconvertedCharacters(); |
| const UChar* cur = upconvertedCharacters; |
| const UChar* end = cur + s.length(); |
| |
| if (!skipOptionalSVGSpaces(cur, end)) |
| return false; |
| |
| float x = 0; |
| if (!parseNumber(cur, end, x)) |
| return false; |
| |
| float y = 0; |
| if (!parseNumber(cur, end, y)) |
| return false; |
| |
| point = FloatPoint(x, y); |
| |
| // Disallow anything except spaces at the end. |
| return !skipOptionalSVGSpaces(cur, end); |
| } |
| |
| bool parseRect(const String& string, FloatRect& rect) |
| { |
| auto upconvertedCharacters = StringView(string).upconvertedCharacters(); |
| const UChar* ptr = upconvertedCharacters; |
| const UChar* end = ptr + string.length(); |
| skipOptionalSVGSpaces(ptr, end); |
| |
| float x = 0; |
| float y = 0; |
| float width = 0; |
| float height = 0; |
| bool valid = parseNumber(ptr, end, x) && parseNumber(ptr, end, y) && parseNumber(ptr, end, width) && parseNumber(ptr, end, height, false); |
| rect = FloatRect(x, y, width, height); |
| return valid; |
| } |
| |
| bool parseGlyphName(const String& input, HashSet<String>& values) |
| { |
| // FIXME: Parsing error detection is missing. |
| values.clear(); |
| |
| auto upconvertedCharacters = StringView(input).upconvertedCharacters(); |
| const UChar* ptr = upconvertedCharacters; |
| const UChar* end = ptr + input.length(); |
| skipOptionalSVGSpaces(ptr, end); |
| |
| while (ptr < end) { |
| // Leading and trailing white space, and white space before and after separators, will be ignored. |
| const UChar* inputStart = ptr; |
| while (ptr < end && *ptr != ',') |
| ++ptr; |
| |
| if (ptr == inputStart) |
| break; |
| |
| // walk backwards from the ; to ignore any whitespace |
| const UChar* inputEnd = ptr - 1; |
| while (inputStart < inputEnd && isSVGSpace(*inputEnd)) |
| --inputEnd; |
| |
| values.add(String(inputStart, inputEnd - inputStart + 1)); |
| skipOptionalSVGSpacesOrDelimiter(ptr, end, ','); |
| } |
| |
| return true; |
| } |
| |
| static bool parseUnicodeRange(const UChar* characters, unsigned length, UnicodeRange& range) |
| { |
| if (length < 2 || characters[0] != 'U' || characters[1] != '+') |
| return false; |
| |
| // Parse the starting hex number (or its prefix). |
| unsigned startRange = 0; |
| unsigned startLength = 0; |
| |
| const UChar* ptr = characters + 2; |
| const UChar* end = characters + length; |
| while (ptr < end) { |
| if (!isASCIIHexDigit(*ptr)) |
| break; |
| ++startLength; |
| if (startLength > 6) |
| return false; |
| startRange = (startRange << 4) | toASCIIHexValue(*ptr); |
| ++ptr; |
| } |
| |
| // Handle the case of ranges separated by "-" sign. |
| if (2 + startLength < length && *ptr == '-') { |
| if (!startLength) |
| return false; |
| |
| // Parse the ending hex number (or its prefix). |
| unsigned endRange = 0; |
| unsigned endLength = 0; |
| ++ptr; |
| while (ptr < end) { |
| if (!isASCIIHexDigit(*ptr)) |
| break; |
| ++endLength; |
| if (endLength > 6) |
| return false; |
| endRange = (endRange << 4) | toASCIIHexValue(*ptr); |
| ++ptr; |
| } |
| |
| if (!endLength) |
| return false; |
| |
| range.first = startRange; |
| range.second = endRange; |
| return true; |
| } |
| |
| // Handle the case of a number with some optional trailing question marks. |
| unsigned endRange = startRange; |
| while (ptr < end) { |
| if (*ptr != '?') |
| break; |
| ++startLength; |
| if (startLength > 6) |
| return false; |
| startRange <<= 4; |
| endRange = (endRange << 4) | 0xF; |
| ++ptr; |
| } |
| |
| if (!startLength) |
| return false; |
| |
| range.first = startRange; |
| range.second = endRange; |
| return true; |
| } |
| |
| bool parseKerningUnicodeString(const String& input, UnicodeRanges& rangeList, HashSet<String>& stringList) |
| { |
| // FIXME: Parsing error detection is missing. |
| auto upconvertedCharacters = StringView(input).upconvertedCharacters(); |
| const UChar* ptr = upconvertedCharacters; |
| const UChar* end = ptr + input.length(); |
| |
| while (ptr < end) { |
| const UChar* inputStart = ptr; |
| while (ptr < end && *ptr != ',') |
| ++ptr; |
| |
| if (ptr == inputStart) |
| break; |
| |
| // Try to parse unicode range first |
| UnicodeRange range; |
| if (parseUnicodeRange(inputStart, ptr - inputStart, range)) |
| rangeList.append(range); |
| else |
| stringList.add(String(inputStart, ptr - inputStart)); |
| ++ptr; |
| } |
| |
| return true; |
| } |
| |
| Vector<String> parseDelimitedString(const String& input, const char seperator) |
| { |
| Vector<String> values; |
| |
| auto upconvertedCharacters = StringView(input).upconvertedCharacters(); |
| const UChar* ptr = upconvertedCharacters; |
| const UChar* end = ptr + input.length(); |
| skipOptionalSVGSpaces(ptr, end); |
| |
| while (ptr < end) { |
| // Leading and trailing white space, and white space before and after semicolon separators, will be ignored. |
| const UChar* inputStart = ptr; |
| while (ptr < end && *ptr != seperator) // careful not to ignore whitespace inside inputs |
| ptr++; |
| |
| if (ptr == inputStart) |
| break; |
| |
| // walk backwards from the ; to ignore any whitespace |
| const UChar* inputEnd = ptr - 1; |
| while (inputStart < inputEnd && isSVGSpace(*inputEnd)) |
| inputEnd--; |
| |
| values.append(String(inputStart, inputEnd - inputStart + 1)); |
| skipOptionalSVGSpacesOrDelimiter(ptr, end, seperator); |
| } |
| |
| return values; |
| } |
| |
| template <typename CharacterType> |
| bool parseFloatPoint(const CharacterType*& current, const CharacterType* end, FloatPoint& point) |
| { |
| float x; |
| float y; |
| if (!parseNumber(current, end, x) |
| || !parseNumber(current, end, y)) |
| return false; |
| point = FloatPoint(x, y); |
| return true; |
| } |
| |
| template bool parseFloatPoint(const LChar*& current, const LChar* end, FloatPoint& point1); |
| template bool parseFloatPoint(const UChar*& current, const UChar* end, FloatPoint& point1); |
| |
| template <typename CharacterType> |
| inline bool parseFloatPoint2(const CharacterType*& current, const CharacterType* end, FloatPoint& point1, FloatPoint& point2) |
| { |
| float x1; |
| float y1; |
| float x2; |
| float y2; |
| if (!parseNumber(current, end, x1) |
| || !parseNumber(current, end, y1) |
| || !parseNumber(current, end, x2) |
| || !parseNumber(current, end, y2)) |
| return false; |
| point1 = FloatPoint(x1, y1); |
| point2 = FloatPoint(x2, y2); |
| return true; |
| } |
| |
| template bool parseFloatPoint2(const LChar*& current, const LChar* end, FloatPoint& point1, FloatPoint& point2); |
| template bool parseFloatPoint2(const UChar*& current, const UChar* end, FloatPoint& point1, FloatPoint& point2); |
| |
| template <typename CharacterType> |
| bool parseFloatPoint3(const CharacterType*& current, const CharacterType* end, FloatPoint& point1, FloatPoint& point2, FloatPoint& point3) |
| { |
| float x1; |
| float y1; |
| float x2; |
| float y2; |
| float x3; |
| float y3; |
| if (!parseNumber(current, end, x1) |
| || !parseNumber(current, end, y1) |
| || !parseNumber(current, end, x2) |
| || !parseNumber(current, end, y2) |
| || !parseNumber(current, end, x3) |
| || !parseNumber(current, end, y3)) |
| return false; |
| point1 = FloatPoint(x1, y1); |
| point2 = FloatPoint(x2, y2); |
| point3 = FloatPoint(x3, y3); |
| return true; |
| } |
| |
| template bool parseFloatPoint3(const LChar*& current, const LChar* end, FloatPoint& point1, FloatPoint& point2, FloatPoint& point3); |
| template bool parseFloatPoint3(const UChar*& current, const UChar* end, FloatPoint& point1, FloatPoint& point2, FloatPoint& point3); |
| |
| } |