Refactor whitespace lexing to be explicit

Removed 'case 0xf00:' to either be the character being checked or
moved to a IsWhitespaceCharacter() check.

BUG=pdfium:815

Change-Id: I34727a00f6d54ecf8de2f9e4eb785b3c10b6c521
Reviewed-on: https://pdfium-review.googlesource.com/9310
Reviewed-by: (OOO Jul 28 - Aug 8) dsinclair <dsinclair@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Ryan Harrison <rharrison@chromium.org>

1 files changed, 17 insertions, 16 deletions

diff --git a/xfa/fxfa/fm2js/cxfa_fmlexer.cpp b/xfa/fxfa/fm2js/cxfa_fmlexer.cpp
index d217587e66..5e5761702b 100644
--- a/xfa/fxfa/fm2js/cxfa_fmlexer.cpp
+++ b/xfa/fxfa/fm2js/cxfa_fmlexer.cpp
@@ -30,6 +30,13 @@ bool IsInitialIdentifierCharacter(wchar_t c) {
          c == 0x0021;                    // '!'
 }
 
+bool IsWhitespaceCharacter(wchar_t c) {
+  return c == 0x0009 ||  // Horizontal tab
+         c == 0x000B ||  // Vertical tab
+         c == 0x000C ||  // Form feed
+         c == 0x0020;    // Space
+}
+
 const XFA_FMKeyword keyWords[] = {
     {TOKand, 0x00000026, L"&"},
     {TOKlparen, 0x00000028, L"("},
@@ -168,23 +175,21 @@ std::unique_ptr<CXFA_FMToken> CXFA_FMLexer::NextToken() {
     }
 
     switch (*m_cursor) {
-      case 0x0A:
+      case '\n':
         ++m_current_line;
         m_token->m_line_num = m_current_line;
         ++m_cursor;
         break;
-      case 0x0D:
+      case '\r':
         ++m_cursor;
         break;
-      case ';': {
+      case ';':
         AdvanceForComment();
         break;
-      }
-      case '"': {
+      case '"':
         m_token->m_type = TOKstring;
         AdvanceForString();
         return std::move(m_token);
-      }
       case '0':
       case '1':
       case '2':
@@ -194,11 +199,10 @@ std::unique_ptr<CXFA_FMToken> CXFA_FMLexer::NextToken() {
       case '6':
       case '7':
       case '8':
-      case '9': {
+      case '9':
         m_token->m_type = TOKnumber;
         AdvanceForNumber();
         return std::move(m_token);
-      }
       case '=':
         ++m_cursor;
         if (m_cursor > m_end) {
@@ -343,20 +347,17 @@ std::unique_ptr<CXFA_FMToken> CXFA_FMLexer::NextToken() {
           m_token->m_type = TOKdot;
         }
         return std::move(m_token);
-      case 0x09:
-      case 0x0B:
-      case 0x0C:
-      case 0x20:
-        ++m_cursor;
-        break;
-      default: {
+      default:
+        if (IsWhitespaceCharacter(*m_cursor)) {
+          ++m_cursor;
+          break;
+        }
         if (!IsInitialIdentifierCharacter(*m_cursor)) {
           RaiseError();
           return nullptr;
         }
         AdvanceForIdentifier();
         return std::move(m_token);
-      }
     }
   }