Ajout de \binom pour afficher les coefficients binomiaux (#250)

apps/reader/tex_parser.cpp

@@ -190,7 +190,12 @@ Layout TexParser::popCommand() {
       return popOverrightarrowCommand();
     }
   }
-
+  if (strncmp(k_binomCommand, m_text, strlen(k_binomCommand)) == 0) {
+    if (isCommandEnded(*(m_text + strlen(k_binomCommand)))) {
+      m_text += strlen(k_binomCommand);
+      return popBinomCommand();
+    }
+  }
   for (int i = 0; i < k_NumberOfSymbols; i++) {
     if (strncmp(k_SymbolsCommands[i], m_text, strlen(k_SymbolsCommands[i])) == 0) {
       if (isCommandEnded(*(m_text + strlen(k_SymbolsCommands[i])))) {
@@ -264,6 +269,13 @@ Layout TexParser::popOverrightarrowCommand() {
   return VectorLayout::Builder(popBlock());
 }
 
+Layout TexParser::popBinomCommand() {
+  Layout numerator = popBlock();
+  Layout denominator = popBlock();
+  BinomialCoefficientLayout b = BinomialCoefficientLayout::Builder(numerator, denominator);
+  return b;
+}
+
 Layout TexParser::popSymbolCommand(int SymbolIndex) {
   uint32_t codePoint = k_SymbolsCodePoints[SymbolIndex];
   return CodePointLayout::Builder(codePoint);
@@ -273,4 +285,4 @@ inline bool TexParser::isCommandEnded(char c) const {
   return !(c >= 'a' && c <= 'z') && !(c >= 'A' && c <= 'Z');
 }
 
-}
+}

apps/reader/tex_parser.h

@@ -28,6 +28,7 @@ private:
   Layout popSqrtCommand();
   Layout popSpaceCommand();
   Layout popOverrightarrowCommand();
+  Layout popBinomCommand();
 
   //Symbols
   Layout popSymbolCommand(int SymbolIndex);
@@ -47,6 +48,7 @@ private:
   static constexpr char const * k_sqrtCommand = "sqrt";
   static constexpr char const * k_spaceCommand = "space";
   static constexpr char const * k_overrightArrowCommand = "overrightarrow";
+  static constexpr char const * k_binomCommand = "binom";
 };
 
 }