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v811_spc009/external/pdfium/xfa/fxfa/cxfa_textparser.cpp

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// Copyright 2017 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#include "xfa/fxfa/cxfa_textparser.h"
#include <algorithm>
#include <utility>
#include <vector>
#include "core/fxcrt/css/cfx_css.h"
#include "core/fxcrt/css/cfx_csscomputedstyle.h"
#include "core/fxcrt/css/cfx_cssstyleselector.h"
#include "core/fxcrt/css/cfx_cssstylesheet.h"
#include "core/fxcrt/fx_codepage.h"
#include "core/fxcrt/xml/cfx_xmlelement.h"
#include "core/fxcrt/xml/cfx_xmlnode.h"
#include "core/fxge/fx_font.h"
#include "third_party/base/ptr_util.h"
#include "xfa/fgas/font/cfgas_fontmgr.h"
#include "xfa/fgas/font/cfgas_gefont.h"
#include "xfa/fxfa/cxfa_ffapp.h"
#include "xfa/fxfa/cxfa_ffdoc.h"
#include "xfa/fxfa/cxfa_fontmgr.h"
#include "xfa/fxfa/cxfa_textparsecontext.h"
#include "xfa/fxfa/cxfa_textprovider.h"
#include "xfa/fxfa/cxfa_texttabstopscontext.h"
#include "xfa/fxfa/parser/cxfa_font.h"
#include "xfa/fxfa/parser/cxfa_measurement.h"
#include "xfa/fxfa/parser/cxfa_para.h"
namespace {
enum class TabStopStatus {
Error,
EOS,
None,
Alignment,
StartLeader,
Leader,
Location,
};
WideString GetLowerCaseElementAttributeOrDefault(
const CFX_XMLElement* pElement,
const WideString& wsName,
const WideString& wsDefaultValue) {
WideString ws = pElement->GetAttribute(wsName);
if (ws.IsEmpty())
ws = wsDefaultValue;
else
ws.MakeLower();
return ws;
}
} // namespace
CXFA_TextParser::CXFA_TextParser()
: m_bParsed(false), m_cssInitialized(false) {}
CXFA_TextParser::~CXFA_TextParser() {}
void CXFA_TextParser::Reset() {
m_mapXMLNodeToParseContext.clear();
m_bParsed = false;
}
void CXFA_TextParser::InitCSSData(CXFA_TextProvider* pTextProvider) {
if (!pTextProvider)
return;
if (!m_pSelector) {
m_pSelector = pdfium::MakeUnique<CFX_CSSStyleSelector>();
CXFA_Font* font = pTextProvider->GetFontIfExists();
m_pSelector->SetDefFontSize(font ? font->GetFontSize() : 10.0f);
}
if (m_cssInitialized)
return;
m_cssInitialized = true;
auto uaSheet = LoadDefaultSheetStyle();
m_pSelector->SetUAStyleSheet(std::move(uaSheet));
m_pSelector->UpdateStyleIndex();
}
std::unique_ptr<CFX_CSSStyleSheet> CXFA_TextParser::LoadDefaultSheetStyle() {
static const char kStyle[] =
"html,body,ol,p,ul{display:block}"
"li{display:list-item}"
"ol,ul{padding-left:33px;margin:1.12em 0}"
"ol{list-style-type:decimal}"
"a{color:#0000ff;text-decoration:underline}"
"b{font-weight:bolder}"
"i{font-style:italic}"
"sup{vertical-align:+15em;font-size:.66em}"
"sub{vertical-align:-15em;font-size:.66em}";
WideString ws = WideString::FromASCII(kStyle);
auto sheet = pdfium::MakeUnique<CFX_CSSStyleSheet>();
if (!sheet->LoadBuffer(ws.c_str(), ws.GetLength()))
return nullptr;
return sheet;
}
RetainPtr<CFX_CSSComputedStyle> CXFA_TextParser::CreateRootStyle(
CXFA_TextProvider* pTextProvider) {
CXFA_Para* para = pTextProvider->GetParaIfExists();
auto pStyle = m_pSelector->CreateComputedStyle(nullptr);
float fLineHeight = 0;
float fFontSize = 10;
if (para) {
fLineHeight = para->GetLineHeight();
CFX_CSSLength indent;
indent.Set(CFX_CSSLengthUnit::Point, para->GetTextIndent());
pStyle->SetTextIndent(indent);
CFX_CSSTextAlign hAlign = CFX_CSSTextAlign::Left;
switch (para->GetHorizontalAlign()) {
case XFA_AttributeValue::Center:
hAlign = CFX_CSSTextAlign::Center;
break;
case XFA_AttributeValue::Right:
hAlign = CFX_CSSTextAlign::Right;
break;
case XFA_AttributeValue::Justify:
hAlign = CFX_CSSTextAlign::Justify;
break;
case XFA_AttributeValue::JustifyAll:
hAlign = CFX_CSSTextAlign::JustifyAll;
break;
case XFA_AttributeValue::Left:
case XFA_AttributeValue::Radix:
break;
default:
NOTREACHED();
break;
}
pStyle->SetTextAlign(hAlign);
CFX_CSSRect rtMarginWidth;
rtMarginWidth.left.Set(CFX_CSSLengthUnit::Point, para->GetMarginLeft());
rtMarginWidth.top.Set(CFX_CSSLengthUnit::Point, para->GetSpaceAbove());
rtMarginWidth.right.Set(CFX_CSSLengthUnit::Point, para->GetMarginRight());
rtMarginWidth.bottom.Set(CFX_CSSLengthUnit::Point, para->GetSpaceBelow());
pStyle->SetMarginWidth(rtMarginWidth);
}
CXFA_Font* font = pTextProvider->GetFontIfExists();
if (font) {
pStyle->SetColor(font->GetColor());
pStyle->SetFontStyle(font->IsItalic() ? CFX_CSSFontStyle::Italic
: CFX_CSSFontStyle::Normal);
pStyle->SetFontWeight(font->IsBold() ? FXFONT_FW_BOLD : FXFONT_FW_NORMAL);
pStyle->SetNumberVerticalAlign(-font->GetBaselineShift());
fFontSize = font->GetFontSize();
CFX_CSSLength letterSpacing;
letterSpacing.Set(CFX_CSSLengthUnit::Point, font->GetLetterSpacing());
pStyle->SetLetterSpacing(letterSpacing);
uint32_t dwDecoration = 0;
if (font->GetLineThrough() > 0)
dwDecoration |= CFX_CSSTEXTDECORATION_LineThrough;
if (font->GetUnderline() > 1)
dwDecoration |= CFX_CSSTEXTDECORATION_Double;
else if (font->GetUnderline() > 0)
dwDecoration |= CFX_CSSTEXTDECORATION_Underline;
pStyle->SetTextDecoration(dwDecoration);
}
pStyle->SetLineHeight(fLineHeight);
pStyle->SetFontSize(fFontSize);
return pStyle;
}
RetainPtr<CFX_CSSComputedStyle> CXFA_TextParser::CreateStyle(
CFX_CSSComputedStyle* pParentStyle) {
auto pNewStyle = m_pSelector->CreateComputedStyle(pParentStyle);
ASSERT(pNewStyle);
if (!pParentStyle)
return pNewStyle;
uint32_t dwDecoration = pParentStyle->GetTextDecoration();
float fBaseLine = 0;
if (pParentStyle->GetVerticalAlign() == CFX_CSSVerticalAlign::Number)
fBaseLine = pParentStyle->GetNumberVerticalAlign();
pNewStyle->SetTextDecoration(dwDecoration);
pNewStyle->SetNumberVerticalAlign(fBaseLine);
const CFX_CSSRect* pRect = pParentStyle->GetMarginWidth();
if (pRect)
pNewStyle->SetMarginWidth(*pRect);
return pNewStyle;
}
RetainPtr<CFX_CSSComputedStyle> CXFA_TextParser::ComputeStyle(
const CFX_XMLNode* pXMLNode,
CFX_CSSComputedStyle* pParentStyle) {
auto it = m_mapXMLNodeToParseContext.find(pXMLNode);
if (it == m_mapXMLNodeToParseContext.end())
return nullptr;
CXFA_TextParseContext* pContext = it->second.get();
if (!pContext)
return nullptr;
pContext->m_pParentStyle.Reset(pParentStyle);
auto tagProvider = ParseTagInfo(pXMLNode);
if (tagProvider->m_bContent)
return nullptr;
auto pStyle = CreateStyle(pParentStyle);
m_pSelector->ComputeStyle(pContext->GetDecls(),
tagProvider->GetAttribute(L"style"),
tagProvider->GetAttribute(L"align"), pStyle.Get());
return pStyle;
}
void CXFA_TextParser::DoParse(const CFX_XMLNode* pXMLContainer,
CXFA_TextProvider* pTextProvider) {
if (!pXMLContainer || !pTextProvider || m_bParsed)
return;
m_bParsed = true;
InitCSSData(pTextProvider);
auto pRootStyle = CreateRootStyle(pTextProvider);
ParseRichText(pXMLContainer, pRootStyle.Get());
}
void CXFA_TextParser::ParseRichText(const CFX_XMLNode* pXMLNode,
CFX_CSSComputedStyle* pParentStyle) {
if (!pXMLNode)
return;
auto tagProvider = ParseTagInfo(pXMLNode);
if (!tagProvider->m_bTagAvailable)
return;
RetainPtr<CFX_CSSComputedStyle> pNewStyle;
if (!(tagProvider->GetTagName().EqualsASCII("body") &&
tagProvider->GetTagName().EqualsASCII("html"))) {
auto pTextContext = pdfium::MakeUnique<CXFA_TextParseContext>();
CFX_CSSDisplay eDisplay = CFX_CSSDisplay::Inline;
if (!tagProvider->m_bContent) {
auto declArray =
m_pSelector->MatchDeclarations(tagProvider->GetTagName());
pNewStyle = CreateStyle(pParentStyle);
m_pSelector->ComputeStyle(declArray, tagProvider->GetAttribute(L"style"),
tagProvider->GetAttribute(L"align"),
pNewStyle.Get());
if (!declArray.empty())
pTextContext->SetDecls(std::move(declArray));
eDisplay = pNewStyle->GetDisplay();
}
pTextContext->SetDisplay(eDisplay);
m_mapXMLNodeToParseContext[pXMLNode] = std::move(pTextContext);
}
for (CFX_XMLNode* pXMLChild = pXMLNode->GetFirstChild(); pXMLChild;
pXMLChild = pXMLChild->GetNextSibling()) {
ParseRichText(pXMLChild, pNewStyle.Get());
}
}
bool CXFA_TextParser::TagValidate(const WideString& wsName) const {
static const uint32_t s_XFATagName[] = {
0x61, // a
0x62, // b
0x69, // i
0x70, // p
0x0001f714, // br
0x00022a55, // li
0x000239bb, // ol
0x00025881, // ul
0x0bd37faa, // sub
0x0bd37fb8, // sup
0xa73e3af2, // span
0xb182eaae, // body
0xdb8ac455, // html
};
return std::binary_search(std::begin(s_XFATagName), std::end(s_XFATagName),
FX_HashCode_GetW(wsName.AsStringView(), true));
}
// static
std::unique_ptr<CXFA_TextParser::TagProvider> CXFA_TextParser::ParseTagInfo(
const CFX_XMLNode* pXMLNode) {
auto tagProvider = pdfium::MakeUnique<TagProvider>();
const CFX_XMLElement* pXMLElement = ToXMLElement(pXMLNode);
if (pXMLElement) {
WideString wsName = pXMLElement->GetLocalTagName();
tagProvider->SetTagName(wsName);
tagProvider->m_bTagAvailable = TagValidate(wsName);
WideString wsValue = pXMLElement->GetAttribute(L"style");
if (!wsValue.IsEmpty())
tagProvider->SetAttribute(L"style", wsValue);
return tagProvider;
}
if (pXMLNode->GetType() == CFX_XMLNode::Type::kText) {
tagProvider->m_bTagAvailable = true;
tagProvider->m_bContent = true;
}
return tagProvider;
}
XFA_AttributeValue CXFA_TextParser::GetVAlign(
CXFA_TextProvider* pTextProvider) const {
CXFA_Para* para = pTextProvider->GetParaIfExists();
return para ? para->GetVerticalAlign() : XFA_AttributeValue::Top;
}
float CXFA_TextParser::GetTabInterval(CFX_CSSComputedStyle* pStyle) const {
WideString wsValue;
if (pStyle && pStyle->GetCustomStyle(L"tab-interval", &wsValue))
return CXFA_Measurement(wsValue.AsStringView()).ToUnit(XFA_Unit::Pt);
return 36;
}
int32_t CXFA_TextParser::CountTabs(CFX_CSSComputedStyle* pStyle) const {
WideString wsValue;
if (pStyle && pStyle->GetCustomStyle(L"xfa-tab-count", &wsValue))
return wsValue.GetInteger();
return 0;
}
bool CXFA_TextParser::IsSpaceRun(CFX_CSSComputedStyle* pStyle) const {
WideString wsValue;
return pStyle && pStyle->GetCustomStyle(L"xfa-spacerun", &wsValue) &&
wsValue.EqualsASCIINoCase("yes");
}
RetainPtr<CFGAS_GEFont> CXFA_TextParser::GetFont(
CXFA_FFDoc* doc,
CXFA_TextProvider* pTextProvider,
CFX_CSSComputedStyle* pStyle) const {
WideString wsFamily = L"Courier";
uint32_t dwStyle = 0;
CXFA_Font* font = pTextProvider->GetFontIfExists();
if (font) {
wsFamily = font->GetTypeface();
if (font->IsBold())
dwStyle |= FXFONT_FORCE_BOLD;
if (font->IsItalic())
dwStyle |= FXFONT_FORCE_BOLD;
}
if (pStyle) {
int32_t iCount = pStyle->CountFontFamilies();
if (iCount > 0)
wsFamily = pStyle->GetFontFamily(iCount - 1).AsStringView();
dwStyle = 0;
if (pStyle->GetFontWeight() > FXFONT_FW_NORMAL)
dwStyle |= FXFONT_FORCE_BOLD;
if (pStyle->GetFontStyle() == CFX_CSSFontStyle::Italic)
dwStyle |= FXFONT_ITALIC;
}
CXFA_FontMgr* pFontMgr = doc->GetApp()->GetXFAFontMgr();
return pFontMgr->GetFont(doc, wsFamily.AsStringView(), dwStyle);
}
float CXFA_TextParser::GetFontSize(CXFA_TextProvider* pTextProvider,
CFX_CSSComputedStyle* pStyle) const {
if (pStyle)
return pStyle->GetFontSize();
CXFA_Font* font = pTextProvider->GetFontIfExists();
return font ? font->GetFontSize() : 10;
}
int32_t CXFA_TextParser::GetHorScale(CXFA_TextProvider* pTextProvider,
CFX_CSSComputedStyle* pStyle,
const CFX_XMLNode* pXMLNode) const {
if (pStyle) {
WideString wsValue;
if (pStyle->GetCustomStyle(L"xfa-font-horizontal-scale", &wsValue))
return wsValue.GetInteger();
while (pXMLNode) {
auto it = m_mapXMLNodeToParseContext.find(pXMLNode);
if (it != m_mapXMLNodeToParseContext.end()) {
CXFA_TextParseContext* pContext = it->second.get();
if (pContext && pContext->m_pParentStyle &&
pContext->m_pParentStyle->GetCustomStyle(
L"xfa-font-horizontal-scale", &wsValue)) {
return wsValue.GetInteger();
}
}
pXMLNode = pXMLNode->GetParent();
}
}
CXFA_Font* font = pTextProvider->GetFontIfExists();
return font ? static_cast<int32_t>(font->GetHorizontalScale()) : 100;
}
int32_t CXFA_TextParser::GetVerScale(CXFA_TextProvider* pTextProvider,
CFX_CSSComputedStyle* pStyle) const {
if (pStyle) {
WideString wsValue;
if (pStyle->GetCustomStyle(L"xfa-font-vertical-scale", &wsValue))
return wsValue.GetInteger();
}
CXFA_Font* font = pTextProvider->GetFontIfExists();
return font ? static_cast<int32_t>(font->GetVerticalScale()) : 100;
}
void CXFA_TextParser::GetUnderline(CXFA_TextProvider* pTextProvider,
CFX_CSSComputedStyle* pStyle,
int32_t& iUnderline,
XFA_AttributeValue& iPeriod) const {
iUnderline = 0;
iPeriod = XFA_AttributeValue::All;
CXFA_Font* font = pTextProvider->GetFontIfExists();
if (!pStyle) {
if (font) {
iUnderline = font->GetUnderline();
iPeriod = font->GetUnderlinePeriod();
}
return;
}
uint32_t dwDecoration = pStyle->GetTextDecoration();
if (dwDecoration & CFX_CSSTEXTDECORATION_Double)
iUnderline = 2;
else if (dwDecoration & CFX_CSSTEXTDECORATION_Underline)
iUnderline = 1;
WideString wsValue;
if (pStyle->GetCustomStyle(L"underlinePeriod", &wsValue)) {
if (wsValue.EqualsASCII("word"))
iPeriod = XFA_AttributeValue::Word;
} else if (font) {
iPeriod = font->GetUnderlinePeriod();
}
}
void CXFA_TextParser::GetLinethrough(CXFA_TextProvider* pTextProvider,
CFX_CSSComputedStyle* pStyle,
int32_t& iLinethrough) const {
iLinethrough = 0;
if (pStyle) {
uint32_t dwDecoration = pStyle->GetTextDecoration();
if (dwDecoration & CFX_CSSTEXTDECORATION_LineThrough)
iLinethrough = 1;
return;
}
CXFA_Font* font = pTextProvider->GetFontIfExists();
if (font)
iLinethrough = font->GetLineThrough();
}
FX_ARGB CXFA_TextParser::GetColor(CXFA_TextProvider* pTextProvider,
CFX_CSSComputedStyle* pStyle) const {
if (pStyle)
return pStyle->GetColor();
CXFA_Font* font = pTextProvider->GetFontIfExists();
return font ? font->GetColor() : 0xFF000000;
}
float CXFA_TextParser::GetBaseline(CXFA_TextProvider* pTextProvider,
CFX_CSSComputedStyle* pStyle) const {
if (pStyle) {
if (pStyle->GetVerticalAlign() == CFX_CSSVerticalAlign::Number)
return pStyle->GetNumberVerticalAlign();
} else {
CXFA_Font* font = pTextProvider->GetFontIfExists();
if (font)
return font->GetBaselineShift();
}
return 0;
}
float CXFA_TextParser::GetLineHeight(CXFA_TextProvider* pTextProvider,
CFX_CSSComputedStyle* pStyle,
bool bFirst,
float fVerScale) const {
float fLineHeight = 0;
if (pStyle) {
fLineHeight = pStyle->GetLineHeight();
} else {
CXFA_Para* para = pTextProvider->GetParaIfExists();
if (para)
fLineHeight = para->GetLineHeight();
}
if (bFirst) {
float fFontSize = GetFontSize(pTextProvider, pStyle);
if (fLineHeight < 0.1f)
fLineHeight = fFontSize;
else
fLineHeight = std::min(fLineHeight, fFontSize);
} else if (fLineHeight < 0.1f) {
fLineHeight = GetFontSize(pTextProvider, pStyle) * 1.2f;
}
fLineHeight *= fVerScale;
return fLineHeight;
}
Optional<WideString> CXFA_TextParser::GetEmbeddedObj(
const CXFA_TextProvider* pTextProvider,
const CFX_XMLNode* pXMLNode) {
if (!pXMLNode)
return {};
const CFX_XMLElement* pElement = ToXMLElement(pXMLNode);
if (!pElement)
return {};
WideString wsAttr = pElement->GetAttribute(L"xfa:embed");
if (wsAttr.IsEmpty())
return {};
if (wsAttr[0] == L'#')
wsAttr.Delete(0);
WideString ws =
GetLowerCaseElementAttributeOrDefault(pElement, L"xfa:embedType", L"som");
if (!ws.EqualsASCII("uri"))
return {};
ws = GetLowerCaseElementAttributeOrDefault(pElement, L"xfa:embedMode",
L"formatted");
if (!(ws.EqualsASCII("raw") || ws.EqualsASCII("formatted")))
return {};
return pTextProvider->GetEmbeddedObj(wsAttr);
}
CXFA_TextParseContext* CXFA_TextParser::GetParseContextFromMap(
const CFX_XMLNode* pXMLNode) {
auto it = m_mapXMLNodeToParseContext.find(pXMLNode);
return it != m_mapXMLNodeToParseContext.end() ? it->second.get() : nullptr;
}
bool CXFA_TextParser::GetTabstops(CFX_CSSComputedStyle* pStyle,
CXFA_TextTabstopsContext* pTabstopContext) {
if (!pStyle || !pTabstopContext)
return false;
WideString wsValue;
if (!pStyle->GetCustomStyle(L"xfa-tab-stops", &wsValue) &&
!pStyle->GetCustomStyle(L"tab-stops", &wsValue)) {
return false;
}
pdfium::span<const wchar_t> spTabStops = wsValue.span();
size_t iCur = 0;
size_t iLast = 0;
WideString wsAlign;
TabStopStatus eStatus = TabStopStatus::None;
while (iCur < spTabStops.size()) {
wchar_t ch = spTabStops[iCur];
switch (eStatus) {
case TabStopStatus::None:
if (ch <= ' ') {
iCur++;
} else {
eStatus = TabStopStatus::Alignment;
iLast = iCur;
}
break;
case TabStopStatus::Alignment:
if (ch == ' ') {
wsAlign = WideStringView(spTabStops.subspan(iLast, iCur - iLast));
eStatus = TabStopStatus::StartLeader;
iCur++;
while (iCur < spTabStops.size() && spTabStops[iCur] <= ' ')
iCur++;
iLast = iCur;
} else {
iCur++;
}
break;
case TabStopStatus::StartLeader:
if (ch != 'l') {
eStatus = TabStopStatus::Location;
} else {
int32_t iCount = 0;
while (iCur < spTabStops.size()) {
ch = spTabStops[iCur];
iCur++;
if (ch == '(') {
iCount++;
} else if (ch == ')') {
iCount--;
if (iCount == 0)
break;
}
}
while (iCur < spTabStops.size() && spTabStops[iCur] <= ' ')
iCur++;
iLast = iCur;
eStatus = TabStopStatus::Location;
}
break;
case TabStopStatus::Location:
if (ch == ' ') {
uint32_t dwHashCode = FX_HashCode_GetW(wsAlign.AsStringView(), true);
CXFA_Measurement ms(
WideStringView(spTabStops.subspan(iLast, iCur - iLast)));
float fPos = ms.ToUnit(XFA_Unit::Pt);
pTabstopContext->Append(dwHashCode, fPos);
wsAlign.clear();
eStatus = TabStopStatus::None;
}
iCur++;
break;
default:
break;
}
}
if (!wsAlign.IsEmpty()) {
uint32_t dwHashCode = FX_HashCode_GetW(wsAlign.AsStringView(), true);
CXFA_Measurement ms(
WideStringView(spTabStops.subspan(iLast, iCur - iLast)));
float fPos = ms.ToUnit(XFA_Unit::Pt);
pTabstopContext->Append(dwHashCode, fPos);
}
return true;
}
CXFA_TextParser::TagProvider::TagProvider()
: m_bTagAvailable(false), m_bContent(false) {}
CXFA_TextParser::TagProvider::~TagProvider() {}
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