Cleanup CSS parsing

This Cl removes unused CSS parsing code. The only caller of
CFDE_CSSStyleSheet::LoadeBuffer is from CXFA_TextParser which provides a static
string. So, we know there are no Media rules, Import rules, FontFace rules or
Page rules in the input style. These rules are also not allowed in inline
styles. This CL removes the supporting code.

Change-Id: I3a559352b2dd0769c465cbd3da40d1db5f9577b0
Reviewed-on: https://pdfium-review.googlesource.com/2330
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: dsinclair <dsinclair@chromium.org>

1 files changed, 0 insertions, 140 deletions

diff --git a/xfa/fde/css/cfde_csssyntaxparser.cpp b/xfa/fde/css/cfde_csssyntaxparser.cpp
index a24b4eee66..f562a374ac 100644
--- a/xfa/fde/css/cfde_csssyntaxparser.cpp
+++ b/xfa/fde/css/cfde_csssyntaxparser.cpp
@@ -19,20 +19,6 @@ bool IsSelectorStart(FX_WCHAR wch) {
          (wch >= 'A' && wch <= 'Z');
 }
 
-bool ParseCSSURI(const FX_WCHAR* pszValue, int32_t* iOffset, int32_t* iLength) {
-  ASSERT(pszValue && *iLength > 0);
-  if (*iLength < 6 || pszValue[*iLength - 1] != ')' ||
-      FXSYS_wcsnicmp(L"url(", pszValue, 4)) {
-    return false;
-  }
-  if (CFDE_CSSDeclaration::ParseCSSString(pszValue + 4, *iLength - 5, iOffset,
-                                          iLength)) {
-    *iOffset += 4;
-    return true;
-  }
-  return false;
-}
-
 }  // namespace
 
 CFDE_CSSSyntaxParser::CFDE_CSSSyntaxParser()
@@ -85,10 +71,6 @@ FDE_CSSSyntaxStatus CFDE_CSSSyntaxParser::DoSyntaxParse() {
       switch (m_eMode) {
         case FDE_CSSSyntaxMode::RuleSet:
           switch (wch) {
-            case '@':
-              m_TextPlane.MoveNext();
-              SwitchMode(FDE_CSSSyntaxMode::AtRule);
-              break;
             case '}':
               m_TextPlane.MoveNext();
               if (RestoreMode())
@@ -194,128 +176,6 @@ FDE_CSSSyntaxStatus CFDE_CSSSyntaxParser::DoSyntaxParse() {
           }
           m_TextPlane.MoveNext();
           break;
-        case FDE_CSSSyntaxMode::MediaType:
-          switch (wch) {
-            case ',':
-              m_TextPlane.MoveNext();
-              SwitchMode(FDE_CSSSyntaxMode::MediaType);
-              if (m_iTextDatLen > 0)
-                return FDE_CSSSyntaxStatus::MediaType;
-              break;
-            case '{': {
-              if (m_ModeStack.empty() ||
-                  m_ModeStack.top() != FDE_CSSSyntaxMode::MediaRule) {
-                m_eStatus = FDE_CSSSyntaxStatus::Error;
-                return m_eStatus;
-              }
-
-              if (m_TextData.GetLength() > 0) {
-                SaveTextData();
-                return FDE_CSSSyntaxStatus::MediaType;
-              }
-              m_TextPlane.MoveNext();
-
-              // Replace the MediaRule with a RuleSet rule.
-              m_ModeStack.top() = FDE_CSSSyntaxMode::RuleSet;
-
-              SwitchMode(FDE_CSSSyntaxMode::RuleSet);
-              return FDE_CSSSyntaxStatus::DeclOpen;
-            }
-            case ';': {
-              if (m_ModeStack.empty() ||
-                  m_ModeStack.top() != FDE_CSSSyntaxMode::Import) {
-                m_eStatus = FDE_CSSSyntaxStatus::Error;
-                return m_eStatus;
-              }
-
-              if (m_TextData.GetLength() > 0) {
-                SaveTextData();
-                if (IsImportEnabled())
-                  return FDE_CSSSyntaxStatus::MediaType;
-              } else {
-                bool bEnabled = IsImportEnabled();
-                m_TextPlane.MoveNext();
-                m_ModeStack.pop();
-                SwitchMode(FDE_CSSSyntaxMode::RuleSet);
-                if (bEnabled) {
-                  DisableImport();
-                  return FDE_CSSSyntaxStatus::ImportClose;
-                }
-              }
-            } break;
-            case '/':
-              if (m_TextPlane.GetNextChar() == '*') {
-                if (SwitchToComment() > 0)
-                  return FDE_CSSSyntaxStatus::MediaType;
-                break;
-              }
-            default:
-              AppendChar(wch);
-              break;
-          }
-          break;
-        case FDE_CSSSyntaxMode::URI: {
-          if (m_ModeStack.empty() ||
-              m_ModeStack.top() != FDE_CSSSyntaxMode::Import) {
-            m_eStatus = FDE_CSSSyntaxStatus::Error;
-            return m_eStatus;
-          }
-
-          if (wch <= ' ' || wch == ';') {
-            int32_t iURIStart, iURILength = m_TextData.GetLength();
-            if (iURILength > 0 &&
-                ParseCSSURI(m_TextData.GetBuffer(), &iURIStart, &iURILength)) {
-              m_TextData.Subtract(iURIStart, iURILength);
-              SwitchMode(FDE_CSSSyntaxMode::MediaType);
-              if (IsImportEnabled())
-                return FDE_CSSSyntaxStatus::URI;
-              break;
-            }
-          }
-          AppendChar(wch);
-        } break;
-        case FDE_CSSSyntaxMode::AtRule:
-          if (wch > ' ') {
-            AppendChar(wch);
-          } else {
-            int32_t iLen = m_TextData.GetLength();
-            const FX_WCHAR* psz = m_TextData.GetBuffer();
-            if (FXSYS_wcsncmp(L"charset", psz, iLen) == 0) {
-              SwitchMode(FDE_CSSSyntaxMode::Charset);
-            } else if (FXSYS_wcsncmp(L"import", psz, iLen) == 0) {
-              m_ModeStack.push(FDE_CSSSyntaxMode::Import);
-              SwitchMode(FDE_CSSSyntaxMode::URI);
-              if (IsImportEnabled())
-                return FDE_CSSSyntaxStatus::ImportRule;
-              break;
-            } else if (FXSYS_wcsncmp(L"media", psz, iLen) == 0) {
-              m_ModeStack.push(FDE_CSSSyntaxMode::MediaRule);
-              SwitchMode(FDE_CSSSyntaxMode::MediaType);
-              return FDE_CSSSyntaxStatus::MediaRule;
-            } else if (FXSYS_wcsncmp(L"font-face", psz, iLen) == 0) {
-              SwitchMode(FDE_CSSSyntaxMode::Selector);
-              return FDE_CSSSyntaxStatus::FontFaceRule;
-            } else if (FXSYS_wcsncmp(L"page", psz, iLen) == 0) {
-              SwitchMode(FDE_CSSSyntaxMode::Selector);
-              return FDE_CSSSyntaxStatus::PageRule;
-            } else {
-              SwitchMode(FDE_CSSSyntaxMode::UnknownRule);
-            }
-          }
-          break;
-        case FDE_CSSSyntaxMode::Charset:
-          if (wch == ';') {
-            m_TextPlane.MoveNext();
-            SwitchMode(FDE_CSSSyntaxMode::RuleSet);
-            if (IsCharsetEnabled()) {
-              DisableCharset();
-              if (m_iTextDatLen > 0)
-                return FDE_CSSSyntaxStatus::Charset;
-            }
-          } else {
-            AppendChar(wch);
-          }
-          break;
         case FDE_CSSSyntaxMode::UnknownRule:
           if (wch == ';')
             SwitchMode(FDE_CSSSyntaxMode::RuleSet);