gecko/dom/svg/SVGTransformListParser.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :
2012-05-21 04:12:37 -07:00
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/ArrayUtils.h"
#include "SVGTransformListParser.h"
#include "SVGContentUtils.h"
#include "nsSVGTransform.h"
#include "nsGkAtoms.h"
#include "nsIAtom.h"
using namespace mozilla;
//----------------------------------------------------------------------
// private methods
bool
SVGTransformListParser::Parse()
{
mTransforms.Clear();
return ParseTransforms();
}
bool
SVGTransformListParser::ParseTransforms()
{
if (!SkipWsp()) {
return true;
}
if (!ParseTransform()) {
return false;
}
while (SkipWsp()) {
// The SVG BNF allows multiple comma-wsp between transforms
while (*mIter == ',') {
++mIter;
if (!SkipWsp()) {
return false;
}
}
if (!ParseTransform()) {
return false;
}
}
return true;
}
bool
SVGTransformListParser::ParseTransform()
{
RangedPtr<const char16_t> start(mIter);
while (IsAlpha(*mIter)) {
++mIter;
if (mIter == mEnd) {
return false;
}
}
if (start == mIter) {
// Didn't read anything
return false;
}
const nsAString& transform = Substring(start.get(), mIter.get());
nsIAtom* keyAtom = NS_GetStaticAtom(transform);
if (!keyAtom || !SkipWsp()) {
return false;
}
if (keyAtom == nsGkAtoms::translate) {
return ParseTranslate();
}
if (keyAtom == nsGkAtoms::scale) {
return ParseScale();
}
if (keyAtom == nsGkAtoms::rotate) {
return ParseRotate();
}
if (keyAtom == nsGkAtoms::skewX) {
return ParseSkewX();
}
if (keyAtom == nsGkAtoms::skewY) {
return ParseSkewY();
}
if (keyAtom == nsGkAtoms::matrix) {
return ParseMatrix();
}
return false;
}
bool
SVGTransformListParser::ParseArguments(float* aResult,
uint32_t aMaxCount,
uint32_t* aParsedCount)
{
if (*mIter != '(') {
return false;
}
++mIter;
if (!SkipWsp()) {
return false;
}
if (!SVGContentUtils::ParseNumber(mIter, mEnd, aResult[0])) {
return false;
}
*aParsedCount = 1;
while (SkipWsp()) {
if (*mIter == ')') {
++mIter;
return true;
}
if (*aParsedCount == aMaxCount) {
return false;
}
SkipCommaWsp();
if (!SVGContentUtils::ParseNumber(mIter, mEnd, aResult[(*aParsedCount)++])) {
return false;
}
}
return false;
}
bool
SVGTransformListParser::ParseTranslate()
{
float t[2];
uint32_t count;
if (!ParseArguments(t, ArrayLength(t), &count)) {
return false;
}
switch (count) {
case 1:
t[1] = 0.f;
// fall-through
case 2:
{
nsSVGTransform* transform = mTransforms.AppendElement();
if (!transform) {
return false;
}
transform->SetTranslate(t[0], t[1]);
return true;
}
}
return false;
}
bool
SVGTransformListParser::ParseScale()
{
float s[2];
uint32_t count;
if (!ParseArguments(s, ArrayLength(s), &count)) {
return false;
}
switch (count) {
case 1:
s[1] = s[0];
// fall-through
case 2:
{
nsSVGTransform* transform = mTransforms.AppendElement();
if (!transform) {
return false;
}
transform->SetScale(s[0], s[1]);
return true;
}
}
return false;
}
bool
SVGTransformListParser::ParseRotate()
{
float r[3];
uint32_t count;
if (!ParseArguments(r, ArrayLength(r), &count)) {
return false;
}
switch (count) {
case 1:
r[1] = r[2] = 0.f;
// fall-through
case 3:
{
nsSVGTransform* transform = mTransforms.AppendElement();
if (!transform) {
return false;
}
transform->SetRotate(r[0], r[1], r[2]);
return true;
}
}
return false;
}
bool
SVGTransformListParser::ParseSkewX()
{
float skew;
uint32_t count;
if (!ParseArguments(&skew, 1, &count) || count != 1) {
return false;
}
nsSVGTransform* transform = mTransforms.AppendElement();
if (!transform) {
return false;
}
transform->SetSkewX(skew);
return true;
}
bool
SVGTransformListParser::ParseSkewY()
{
float skew;
uint32_t count;
if (!ParseArguments(&skew, 1, &count) || count != 1) {
return false;
}
nsSVGTransform* transform = mTransforms.AppendElement();
if (!transform) {
return false;
}
transform->SetSkewY(skew);
return true;
}
bool
SVGTransformListParser::ParseMatrix()
{
float m[6];
uint32_t count;
if (!ParseArguments(m, ArrayLength(m), &count) || count != 6) {
return false;
}
nsSVGTransform* transform = mTransforms.AppendElement();
if (!transform) {
return false;
}
transform->SetMatrix(gfxMatrix(m[0], m[1], m[2], m[3], m[4], m[5]));
return true;
}