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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkParse.h"
#include "SkSVGAttributeParser.h"
#include "SkSVGTypes.h"
namespace {
// TODO: these should be shared with SkParse.cpp
inline bool is_between(char c, char min, char max) {
SkASSERT(min <= max);
return (unsigned)(c - min) <= (unsigned)(max - min);
}
inline bool is_eos(char c) {
return !c;
}
inline bool is_ws(char c) {
return is_between(c, 1, 32);
}
inline bool is_sep(char c) {
return is_ws(c) || c == ',' || c == ';';
}
} // anonymous ns
SkSVGAttributeParser::SkSVGAttributeParser(const char attributeString[])
: fCurPos(attributeString) {}
template <typename F>
inline bool SkSVGAttributeParser::advanceWhile(F f) {
auto initial = fCurPos;
while (f(*fCurPos)) {
fCurPos++;
}
return fCurPos != initial;
}
inline bool SkSVGAttributeParser::parseEOSToken() {
return is_eos(*fCurPos);
}
inline bool SkSVGAttributeParser::parseSepToken() {
return this->advanceWhile(is_sep);
}
inline bool SkSVGAttributeParser::parseWSToken() {
return this->advanceWhile(is_ws);
}
inline bool SkSVGAttributeParser::parseExpectedStringToken(const char* expected) {
const char* c = fCurPos;
while (*c && *expected && *c == *expected) {
c++;
expected++;
}
if (*expected) {
return false;
}
fCurPos = c;
return true;
}
bool SkSVGAttributeParser::parseScalarToken(SkScalar* res) {
if (const char* next = SkParse::FindScalar(fCurPos, res)) {
fCurPos = next;
return true;
}
return false;
}
bool SkSVGAttributeParser::parseHexToken(uint32_t* res) {
if (const char* next = SkParse::FindHex(fCurPos, res)) {
fCurPos = next;
return true;
}
return false;
}
bool SkSVGAttributeParser::parseLengthUnitToken(SkSVGLength::Unit* unit) {
static const struct {
const char* fUnitName;
SkSVGLength::Unit fUnit;
} gUnitInfo[] = {
{ "%" , SkSVGLength::Unit::kPercentage },
{ "em", SkSVGLength::Unit::kEMS },
{ "ex", SkSVGLength::Unit::kEXS },
{ "px", SkSVGLength::Unit::kPX },
{ "cm", SkSVGLength::Unit::kCM },
{ "mm", SkSVGLength::Unit::kMM },
{ "in", SkSVGLength::Unit::kIN },
{ "pt", SkSVGLength::Unit::kPT },
{ "pc", SkSVGLength::Unit::kPC },
};
for (size_t i = 0; i < SK_ARRAY_COUNT(gUnitInfo); ++i) {
if (this->parseExpectedStringToken(gUnitInfo[i].fUnitName)) {
*unit = gUnitInfo[i].fUnit;
return true;
}
}
return false;
}
bool SkSVGAttributeParser::parseNamedColorToken(SkColor* c) {
if (const char* next = SkParse::FindNamedColor(fCurPos, strlen(fCurPos), c)) {
fCurPos = next;
return true;
}
return false;
}
bool SkSVGAttributeParser::parseHexColorToken(SkColor* c) {
uint32_t v;
const char* initial = fCurPos;
if (!this->parseExpectedStringToken("#") || !this->parseHexToken(&v)) {
return false;
}
switch (fCurPos - initial) {
case 7:
// matched #xxxxxxx
break;
case 4:
// matched '#xxx;
v = ((v << 12) & 0x00f00000) |
((v << 8) & 0x000ff000) |
((v << 4) & 0x00000ff0) |
((v << 0) & 0x0000000f);
break;
default:
return false;
}
*c = v | 0xff000000;
return true;
}
// https://www.w3.org/TR/SVG/types.html#DataTypeColor
bool SkSVGAttributeParser::parseColor(SkSVGColor* color) {
SkColor c;
// TODO: rgb(...)
if (this->parseHexColorToken(&c) || this->parseNamedColorToken(&c)) {
*color = SkSVGColor(c);
return true;
}
return false;
}
// https://www.w3.org/TR/SVG/types.html#DataTypeNumber
bool SkSVGAttributeParser::parseNumber(SkSVGNumber* number) {
// consume WS
this->parseWSToken();
SkScalar s;
if (this->parseScalarToken(&s)) {
*number = SkSVGNumber(s);
// consume trailing separators
this->parseSepToken();
return true;
}
return false;
}
// https://www.w3.org/TR/SVG/types.html#DataTypeLength
bool SkSVGAttributeParser::parseLength(SkSVGLength* length) {
SkScalar s;
SkSVGLength::Unit u = SkSVGLength::Unit::kNumber;
if (this->parseScalarToken(&s) &&
(this->parseLengthUnitToken(&u) || this->parseSepToken() || this->parseEOSToken())) {
*length = SkSVGLength(s, u);
// consume trailing separators
this->parseSepToken();
return true;
}
return false;
}
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