From 0751c88a2d018e93651ecd2baea1cf27ca30a859 Mon Sep 17 00:00:00 2001
From: Mino1289 <68814671+Mino1289@users.noreply.github.com>
Date: Fri, 17 Jun 2022 12:25:38 +0200
Subject: [PATCH] [TexParser] Adding Sum, Product and Integral (#252)

---
 apps/reader/tex_parser.cpp | 89 ++++++++++++++++++++++++++++----------
 apps/reader/tex_parser.h   | 20 ++++++---
 2 files changed, 80 insertions(+), 29 deletions(-)

diff --git a/apps/reader/tex_parser.cpp b/apps/reader/tex_parser.cpp
index ff9b80749..3008db6d9 100644
--- a/apps/reader/tex_parser.cpp
+++ b/apps/reader/tex_parser.cpp
@@ -153,6 +153,18 @@ Layout TexParser::popCommand() {
       return popCeilCommand();
     }
   }
+  if (strncmp(k_integralCommand, m_text, strlen(k_integralCommand)) == 0) {
+    if (isCommandEnded(*(m_text + strlen(k_integralCommand)))) {
+      m_text += strlen(k_integralCommand);
+      return popIntegralCommand();
+    }
+  }
+  if (strncmp(k_intsetCommand, m_text, strlen(k_intsetCommand)) == 0) {
+    if (isCommandEnded(*(m_text + strlen(k_intsetCommand)))) {
+      m_text += strlen(k_intsetCommand);
+      return popIntsetCommand();
+    }
+  }
   if (strncmp(k_floorCommand, m_text, strlen(k_floorCommand)) == 0) {
     if (isCommandEnded(*(m_text + strlen(k_floorCommand)))) {
       m_text += strlen(k_floorCommand);
@@ -171,25 +183,6 @@ Layout TexParser::popCommand() {
       return popLeftCommand();
     }
   }
-  if (strncmp(k_rightCommand, m_text, strlen(k_rightCommand)) == 0) {
-    if (isCommandEnded(*(m_text + strlen(k_rightCommand)))) {
-      m_text += strlen(k_rightCommand);
-      return popRightCommand();
-    }
-  }
-  if (strncmp(k_sqrtCommand, m_text, strlen(k_sqrtCommand)) == 0) {
-    if (isCommandEnded(*(m_text + strlen(k_sqrtCommand)))) {
-      m_text += strlen(k_sqrtCommand);
-      return popSqrtCommand();
-    }
-  }
-
-  if (strncmp(k_spaceCommand, m_text, strlen(k_spaceCommand)) == 0) {
-    if (isCommandEnded(*(m_text + strlen(k_spaceCommand)))) {
-      m_text += strlen(k_spaceCommand);
-      return popSpaceCommand();
-    }
-  }
   if (strncmp(k_overrightArrowCommand, m_text, strlen(k_overrightArrowCommand)) == 0) {
     if (isCommandEnded(*(m_text + strlen(k_overrightArrowCommand)))) {
       m_text += strlen(k_overrightArrowCommand);
@@ -202,12 +195,37 @@ Layout TexParser::popCommand() {
       return popOverlineCommand();
     }
   }
-  if (strncmp(k_intsetCommand, m_text, strlen(k_intsetCommand)) == 0) {
-    if (isCommandEnded(*(m_text + strlen(k_intsetCommand)))) {
-      m_text += strlen(k_intsetCommand);
-      return popIntsetCommand();
+  if (strncmp(k_productCommand, m_text, strlen(k_productCommand)) == 0) {
+    if (isCommandEnded(*(m_text + strlen(k_productCommand)))) {
+      m_text += strlen(k_productCommand);
+      return popProductCommand();
     }
   }
+  if (strncmp(k_rightCommand, m_text, strlen(k_rightCommand)) == 0) {
+    if (isCommandEnded(*(m_text + strlen(k_rightCommand)))) {
+      m_text += strlen(k_rightCommand);
+      return popRightCommand();
+    }
+  }
+  if (strncmp(k_spaceCommand, m_text, strlen(k_spaceCommand)) == 0) {
+    if (isCommandEnded(*(m_text + strlen(k_spaceCommand)))) {
+      m_text += strlen(k_spaceCommand);
+      return popSpaceCommand();
+    }
+  }
+  if (strncmp(k_sqrtCommand, m_text, strlen(k_sqrtCommand)) == 0) {
+    if (isCommandEnded(*(m_text + strlen(k_sqrtCommand)))) {
+      m_text += strlen(k_sqrtCommand);
+      return popSqrtCommand();
+    }
+  }
+  if (strncmp(k_sumCommand, m_text, strlen(k_sumCommand)) == 0) {
+    if (isCommandEnded(*(m_text + strlen(k_sumCommand)))) {
+      m_text += strlen(k_sumCommand);
+      return popSumCommand();
+    }
+  }
+
   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])))) {
@@ -255,6 +273,14 @@ Layout TexParser::popFracCommand() {
   return l;
 }
 
+Layout TexParser::popIntegralCommand() {
+  Layout arg = popBlock();
+  Layout var = popBlock();
+  Layout start = popBlock();
+  Layout end = popBlock();
+  return IntegralLayout::Builder(arg, var, start, end);
+}
+
 Layout TexParser::popIntsetCommand() {
   HorizontalLayout intset = HorizontalLayout::Builder();
   intset.addOrMergeChildAtIndex(CodePointLayout::Builder(0x27e6), 0, false);
@@ -268,6 +294,15 @@ Layout TexParser::popLeftCommand() {
   return LeftParenthesisLayout::Builder();
 }
 
+Layout TexParser::popProductCommand() {
+  Layout arg = popBlock();
+  Layout var = popBlock();
+  Layout start = popBlock();
+  Layout end = popBlock();
+  return ProductLayout::Builder(arg, var, start, end);
+}
+
+
 Layout TexParser::popRightCommand() {
   m_text++;
   return RightParenthesisLayout::Builder();
@@ -288,6 +323,14 @@ Layout TexParser::popSqrtCommand() {
   }
 }
 
+Layout TexParser::popSumCommand() {
+  Layout arg = popBlock();
+  Layout var = popBlock();
+  Layout start = popBlock();
+  Layout end = popBlock();
+  return SumLayout::Builder(arg, var, start, end);
+}
+
 Layout TexParser::popSpaceCommand() {
   return LayoutHelper::String(" ", 1);
 }
diff --git a/apps/reader/tex_parser.h b/apps/reader/tex_parser.h
index 4010ede3d..088b3385b 100644
--- a/apps/reader/tex_parser.h
+++ b/apps/reader/tex_parser.h
@@ -24,13 +24,17 @@ private:
   Layout popCeilCommand();
   Layout popFloorCommand();
   Layout popFracCommand();
+  Layout popIntegralCommand();
   Layout popIntsetCommand();
   Layout popLeftCommand();
-  Layout popRightCommand();
-  Layout popSqrtCommand();
-  Layout popSpaceCommand();
   Layout popOverrightarrowCommand();
   Layout popOverlineCommand();
+  Layout popProductCommand();
+  Layout popRightCommand();
+  Layout popSqrtCommand();
+  Layout popSumCommand();
+  Layout popSpaceCommand();
+
 
   //Symbols
   Layout popSymbolCommand(int SymbolIndex);
@@ -46,13 +50,17 @@ private:
   static constexpr char const * k_ceilCommand = "ceil";
   static constexpr char const * k_floorCommand = "floor";
   static constexpr char const * k_fracCommand = "frac";
+  static constexpr char const * k_integralCommand = "int";
   static constexpr char const * k_intsetCommand = "intset";
   static constexpr char const * k_leftCommand = "left";
-  static constexpr char const * k_rightCommand = "right";
-  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_overlineCommand = "overline";
+  static constexpr char const * k_productCommand = "prod";
+  static constexpr char const * k_rightCommand = "right";
+  static constexpr char const * k_spaceCommand = "space";
+  static constexpr char const * k_sqrtCommand = "sqrt";
+  static constexpr char const * k_sumCommand = "sum";
+
   
 };