Add more samples, simplify grammar, add groups

.vscode/launch.json

@@ -7,17 +7,44 @@
         {
             "type": "antlr-debug",
             "request": "launch",
-            "name": "Debug Current Grammar",
+            "name": "Grammar - simple.bfe",
-            "input": "sample.bfe",
+            "input": "samples/simple.bfe",
             "visualParseTree": true,
-            "grammar": "${file}"
+            "grammar": "${workspaceFolder}/grammar/bf.g4"
         },
         {
-            "name": "(gdb) Launch",
+            "type": "antlr-debug",
+            "request": "launch",
+            "name": "Grammar - group.bfe",
+            "input": "samples/group.bfe",
+            "visualParseTree": true,
+            "grammar": "${workspaceFolder}/grammar/bf.g4"
+        },
+        {
+            "name": "GDB - simple.bfe",
             "type": "cppdbg",
             "request": "launch",
-            "program": "${workspaceFolder}/debug/main.out",
+            "program": "${workspaceFolder}/build/main.out",
-            "args": ["sample.txt"],
+            "args": ["samples/simple.bfe"],
+            "stopAtEntry": false,
+            "cwd": "${workspaceFolder}",
+            "environment": [],
+            "externalConsole": false,
+            "MIMode": "gdb",
+            "setupCommands": [
+                {
+                    "description": "Enable pretty-printing for gdb",
+                    "text": "-enable-pretty-printing",
+                    "ignoreFailures": true
+                }
+            ]
+        },
+        {
+            "name": "GDB - group.bfe",
+            "type": "cppdbg",
+            "request": "launch",
+            "program": "${workspaceFolder}/build/main.out",
+            "args": ["samples/group.bfe"],
             "stopAtEntry": false,
             "cwd": "${workspaceFolder}",
             "environment": [],

grammar/bf.g4

@@ -1,28 +1,62 @@
 grammar bf;
 
 program
-    : statements* EOF;
+    : statements? EOF;
 
 statements
-    : (statement|numberedStatement|loopStmt)+;
+    : eligibleStmt+;
+
+eligibleStmt
+    : stmt
+    | numberedStmt
+    ;
+
+numberedStmt
+    : stmt NUMBER
+    ;
+
+
+stmt
+    : basicStmt
+    | groupedStmt
+    | loopStmt
+    ;
+
+
+groupedStmt
+    : GRPSTART statements GRPEND
+    ;
 
 loopStmt
     : LOOPSTART statements LOOPEND 
     ;
 
-numberedStatement
+basicStmt 
-    : statement NUMBER
+    : ptrIncr
-    ;
+    | ptrDecr
-
+    | ptrLeft
-statement
+    | ptrRight
-    : INC
-    | DEC 
-    | LEFT 
-    | RIGHT
     | inputStmt
     | outputStmt
     ;
 
+
+ptrIncr
+    : INC
+    ;
+
+ptrDecr
+    : DEC
+    ;
+
+ptrLeft
+    : LEFT
+    ;
+
+ptrRight
+    : RIGHT
+    ;
+
 inputStmt
     : INPUT
     ;
@@ -34,8 +68,11 @@ outputStmt
 NEWLINE: '\n' -> skip;
 COMMENT: '//' ~[\r\n]* '\r'? '\n'? -> channel(HIDDEN);
 WS: [ \r\n] -> skip;
+DEF: '#';
 LOOPSTART: '[';
 LOOPEND:']';
+GRPSTART:'(';
+GRPEND:')';
 NUMBER: [0-9]+;
 INPUT: '?';
 OUTPUT: '.';

include/main.hpp

@@ -1,3 +1,23 @@
 #pragma once
 
-#define FOO 1
+#include<string>
+#include "bfBaseListener.h"
+
+
+class expressionPrintingListener : public bfBaseListener {
+    protected:
+        std::vector<std::string> printStack;
+    public:
+        void enterProgram(bfParser::ProgramContext *ctx) override;
+        void exitProgram(bfParser::ProgramContext *ctx) override ;
+        void enterPtrIncr(bfParser::PtrIncrContext *ctx) override;
+        void enterPtrDecr(bfParser::PtrDecrContext *ctx) override;
+        void enterPtrLeft(bfParser::PtrLeftContext *ctx) override;
+        void enterPtrRight(bfParser::PtrRightContext *ctx) override;
+        void enterNumberedStmt(bfParser::NumberedStmtContext *ctx) override;
+        void exitNumberedStmt(bfParser::NumberedStmtContext *ctx) override;
+        void enterLoopStmt(bfParser::LoopStmtContext *ctx) override;
+        void exitLoopStmt(bfParser::LoopStmtContext *ctx) override;
+        void enterGroupedStmt(bfParser::GroupedStmtContext *ctx) override;
+        void exitGroupedStmt(bfParser::GroupedStmtContext *ctx) override;
+};

samples/group.bfe

@@ -0,0 +1,2 @@
+//should print ++++++
+(+2)3

samples/simple.bfe

@@ -2,4 +2,5 @@
 
 -[-7>+<]>-.-[->+5<]>++.+7..+3.[-3>+<]>-5.--[->+4<]>-.-8.+3.-6.-8.
 
+
 // courtesy of https://copy.sh/brainfuck/text.html

src/main.cpp

@@ -1,4 +1,6 @@
 #include <iostream>
+#include <vector>
+#include <string>
 #include <antlr4-common.h>
 #include "main.hpp"
 #include "bfLexer.h"
@@ -8,44 +10,70 @@
 
 using namespace antlr4;
 
-class expressionPrintingListener : public bfBaseListener
+void expressionPrintingListener::enterProgram(bfParser::ProgramContext *ctx)
 {
-public:
+    printStack.push_back("");
-    void enterStatement(bfParser::StatementContext *ctx) override
+}
+void expressionPrintingListener::exitProgram(bfParser::ProgramContext *ctx)
+{
+    std::cout << printStack.front() << std::endl;
+}
+void expressionPrintingListener::enterPtrIncr(bfParser::PtrIncrContext *ctx)
+{
+    printStack.back() += "+";
+}
+void expressionPrintingListener::enterPtrDecr(bfParser::PtrDecrContext *ctx)
+{
+    printStack.back() += ("-");
+}
+void expressionPrintingListener::enterPtrLeft(bfParser::PtrLeftContext *ctx)
+{
+    printStack.back() += ("<");
+}
+void expressionPrintingListener::enterPtrRight(bfParser::PtrRightContext *ctx)
+{
+    printStack.back() += (">");
+}
+
+void expressionPrintingListener::enterNumberedStmt(bfParser::NumberedStmtContext *ctx)
+{
+    printStack.push_back("");
+}
+void expressionPrintingListener::exitNumberedStmt(bfParser::NumberedStmtContext *ctx)
+{
+    std::string s = printStack.back();
+    printStack.pop_back();
+    int n = stoi(ctx->NUMBER()->getText());
+    for (int i = 0; i < n; i++)
     {
-        std::cout << ctx->getText();
+        printStack.back() += s;
     }
-    void enterNumberedStatement(bfParser::NumberedStatementContext *ctx) override
+}
-    {
+void expressionPrintingListener::enterLoopStmt(bfParser::LoopStmtContext *ctx){
-        int num = 0;
+    printStack.push_back("");
-        try{
+}
-            num = stoi(ctx->NUMBER()->getText());
+void expressionPrintingListener::exitLoopStmt(bfParser::LoopStmtContext *ctx){
-        }catch(std::exception e){
+    std::string s = printStack.back();
-            num = 1;
+    printStack.pop_back();
-        }
+    printStack.back()+= "["+s+"]";
-        for (int i = 0; i < num - 1; i++)
+}
-        {
+void expressionPrintingListener::enterGroupedStmt(bfParser::GroupedStmtContext *ctx){
-            std::cout << ctx->statement()->getText();
+    printStack.push_back("");
-        }
+}
-    }
+void expressionPrintingListener::exitGroupedStmt(bfParser::GroupedStmtContext *ctx){
-    void exitProgram(bfParser::ProgramContext *ctx) override{
+    std::string s = printStack.back();
-        std::cout<<std::endl;
+    printStack.pop_back();
-    }
+    printStack.back()+=(s);
-    void enterLoopStmt(bfParser::LoopStmtContext *ctx) override{
+}
-        std::cout<<'[';
-    }
-    void exitLoopStmt(bfParser::LoopStmtContext *ctx) override{
-        std::cout<<']';
-    }
-};
 
 int main(int argc, const char *argv[])
 {
     std::ifstream stream;
-    
+    bool outFile = false;
     stream.open(argv[1]);
-    if(stream.fail()){
+    if (stream.fail())
-        std::cout<<"Could not open"<<std::endl;
+    {
+        std::cout << "Could not open" << std::endl;
         return 1;
     }
     ANTLRInputStream input(stream);