From 1b524f75401a6318fbaf3fee0bfcbe59348f2e51 Mon Sep 17 00:00:00 2001
From: _ov4 <hausemasterstream@gmail.com>
Date: Mon, 2 Feb 2026 10:08:22 +0000
Subject: Added STRING

---
 include/cps/AST.h           |  7 +++++++
 include/cps/CodeGen.h       |  3 +++
 include/cps/Lexer.h         |  9 +++++++++
 include/cps/Parser.h        |  3 +++
 include/cps/StringHandler.h | 38 ++++++++++++++++++++++++++++++++++++++
 5 files changed, 60 insertions(+)
 create mode 100644 include/cps/StringHandler.h

(limited to 'include/cps')

diff --git a/include/cps/AST.h b/include/cps/AST.h
index de57024..f07e937 100644
--- a/include/cps/AST.h
+++ b/include/cps/AST.h
@@ -32,6 +32,13 @@ public:
     bool getVal() const { return Val; }
 };
 
+class StringExprAST : public ExprAST {
+    std::string Val;
+public:
+    StringExprAST(const std::string &Val) : Val(Val) {}
+    const std::string &getVal() const { return Val; }
+};
+
 class VariableExprAST : public ExprAST {
     std::string Name;
 public:
diff --git a/include/cps/CodeGen.h b/include/cps/CodeGen.h
index df9eef4..cb8cecb 100644
--- a/include/cps/CodeGen.h
+++ b/include/cps/CodeGen.h
@@ -10,6 +10,7 @@
 #include "cps/RealHandler.h"
 #include "cps/BooleanHandler.h"
 #include "cps/ArithmeticHandler.h"
+#include "cps/StringHandler.h"
 
 #include <map>
 #include <memory>
@@ -32,6 +33,7 @@ class CodeGen {
     std::unique_ptr<RealHandler> RealHelper;
     std::unique_ptr<BooleanHandler> BoolHandler;
     std::unique_ptr<ArithmeticHandler> ArithHandler;
+    std::unique_ptr<StringHandler> StrHandler;
 
     llvm::FunctionCallee PrintfFunc;
     llvm::FunctionCallee ScanfFunc;
@@ -42,6 +44,7 @@ class CodeGen {
     
     llvm::Value *ScanfFormatStr;        // %lld
     llvm::Value *ScanfFloatFormatStr;   // %lf
+    llvm::Value *ScanfStringFormatStr;  // %s
     
     llvm::Value *TrueStr;               // "TRUE"
     llvm::Value *FalseStr;              // "FALSE"
diff --git a/include/cps/Lexer.h b/include/cps/Lexer.h
index 97ccd83..c36599f 100644
--- a/include/cps/Lexer.h
+++ b/include/cps/Lexer.h
@@ -41,6 +41,14 @@ enum Token {
     tok_or = -26,
     tok_not = -27,
 
+    tok_string_kw = -30,
+    tok_length = -31,
+    tok_mid = -32,
+    tok_right = -33,
+    tok_lcase = -34,
+    tok_ucase = -35,
+    tok_string_literal = -36,
+
     tok_identifier = -100,
     tok_number_int = -101,
     tok_number_real = -102,
@@ -71,6 +79,7 @@ class Lexer {
     int CurrentLine = 1;
 public:
     std::string IdentifierStr;
+    std::string StringVal;
     int64_t NumVal;
     double RealVal;
 
diff --git a/include/cps/Parser.h b/include/cps/Parser.h
index db1f243..877c684 100644
--- a/include/cps/Parser.h
+++ b/include/cps/Parser.h
@@ -4,6 +4,7 @@
 #include <vector>
 #include <memory>
 #include <map>
+#include <tuple>
 
 namespace cps {
 
@@ -24,6 +25,8 @@ class Parser {
     std::unique_ptr<ExprAST> ParseNumberExpr();
     std::unique_ptr<ExprAST> ParseIdentifierExpr();
     std::unique_ptr<ExprAST> ParseParenExpr();
+    
+    std::unique_ptr<ExprAST> ParseStringBuiltin(const std::string &FuncName);
 
     std::unique_ptr<StmtAST> ParseStatement();
     std::unique_ptr<StmtAST> ParseIfStmt();
diff --git a/include/cps/StringHandler.h b/include/cps/StringHandler.h
new file mode 100644
index 0000000..87710fb
--- /dev/null
+++ b/include/cps/StringHandler.h
@@ -0,0 +1,38 @@
+#pragma once
+#include "llvm/IR/IRBuilder.h"
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/IR/Module.h"
+#include <map>
+#include <string>
+
+namespace cps {
+
+class StringHandler {
+    llvm::LLVMContext &Context;
+    llvm::IRBuilder<> &Builder;
+    llvm::Module &Module;
+    std::map<std::string, llvm::Value*> &NamedValues;
+
+    llvm::FunctionCallee MallocFunc;
+    llvm::FunctionCallee FreeFunc;
+    llvm::FunctionCallee StrLenFunc;
+    llvm::FunctionCallee MemCpyFunc;
+    llvm::FunctionCallee ToUpperFunc;
+    llvm::FunctionCallee ToLowerFunc;
+
+public:
+    StringHandler(llvm::LLVMContext &Ctx, llvm::IRBuilder<> &B, llvm::Module &M, 
+                  std::map<std::string, llvm::Value*> &NV);
+    
+    void setupExternalFunctions();
+    void emitDeclare(const std::string &Name);
+    llvm::Value *createLiteral(const std::string &Val);
+    
+    llvm::Value *emitLength(llvm::Value *Str);
+    llvm::Value *emitMid(llvm::Value *Str, llvm::Value *Start, llvm::Value *Len);
+    llvm::Value *emitRight(llvm::Value *Str, llvm::Value *Len);
+    llvm::Value *emitLCase(llvm::Value *Str);
+    llvm::Value *emitUCase(llvm::Value *Str);
+};
+
+}
-- 
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