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#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define MAX_IDENTIFIER_SIZE 30
#define MAX_BUFFER_SIZE 100

// Token types
typedef enum {
    TOKEN_IDENTIFIER,
    TOKEN_INTEGER,
    TOKEN_STRING,
    TOKEN_OPERATOR,
    TOKEN_KEYWORD,
    TOKEN_END_OF_LINE,
    TOKEN_COMMENT
} TokenType;

// Token structure
typedef struct {
    TokenType type;
    char lexeme[MAX_IDENTIFIER_SIZE + 1]; // +1 for null terminator
} Token;

// Global variables
int myInt;
char myText[MAX_BUFFER_SIZE];

// Function declarations
Token getNextToken(FILE* file);
void parseProgram(FILE* file);
void parseStatement(Token token, FILE* file);
void parseAssignment(Token token, FILE* file);
void parseFunctionCall(Token token, FILE* file);
void executeStatement(Token token);
void executeAssignment(Token token);
void executeFunctionCall(Token token);
void executeSize(Token token);
void executeSubs(Token token);
void executeLocate(Token token);
void executeInsert(Token token);
void executeOverride(Token token);
void executeAsString(Token token);
void executeAsText(Token token);
void executeRead(Token token);
void executeWrite(Token token);
void executeInput(Token token);
void executeOutput(Token token);

Token getNextToken(FILE* file) {
    // Implement the lexer logic to read from the file and tokenize the input program
    // Return the next token
    Token token;
    // Implement the lexer logic here
    return token;
}

void parseProgram(FILE* file) {
    Token token;
    do {
        token = getNextToken(file);
        parseStatement(token, file);
    } while (token.type != TOKEN_END_OF_LINE);
}

void parseStatement(Token token, FILE* file) {
    if (token.type == TOKEN_IDENTIFIER) {
        parseAssignment(token, file);
    } else if (token.type == TOKEN_KEYWORD) {
        parseFunctionCall(token, file);
    }
}

void parseAssignment(Token token, FILE* file) {
    // Implement the parsing logic for assignment statements
    if (strcmp(token.lexeme, "new") != 0) {
        printf("Error: Expected 'new' keyword.\n");
        return;
    }
    
    Token nextToken = getNextToken(file);
    
    if (nextToken.type != TOKEN_IDENTIFIER) {
        printf("Error: Expected identifier after 'new'.\n");
        return;
    }
    
    if (strcmp(nextToken.lexeme, "int") == 0) {
        executeAssignment(token);
    } else if (strcmp(nextToken.lexeme, "text") == 0) {
        executeAssignment(token);
    } else {
        printf("Error: Invalid data type.\n");
        return;
    }
}

void parseFunctionCall(Token token, FILE* file) {
    // Implement the parsing logic for function calls
    // You will need to handle different predefined functions and their arguments
    if (strcmp(token.lexeme, "size") == 0) {
        executeSize(token);
    } else if (strcmp(token.lexeme, "subs") == 0) {
        executeSubs(token);
    } else if (strcmp(token.lexeme, "locate") == 0) {
        executeLocate(token);
    } else if (strcmp(token.lexeme, "insert") == 0) {
        executeInsert(token);
    } else if (strcmp(token.lexeme, "override") == 0) {
        executeOverride(token);
    } else if (strcmp(token.lexeme, "asString") == 0) {
        executeAsString(token);
    } else if (strcmp(token.lexeme, "asText") == 0) {
        executeAsText(token);
    } else if (strcmp(token.lexeme, "read") == 0) {
        executeRead(token);
    } else if (strcmp(token.lexeme, "write") == 0) {
        executeWrite(token);
    } else if (strcmp(token.lexeme, "input") == 0) {
        executeInput(token);
    } else if (strcmp(token.lexeme, "output") == 0) {
        executeOutput(token);
    } else {
        printf("Error: Invalid function call.\n");
        return;
    }
}

void executeStatement(Token token) {
    // Implement the execution logic for statements
    // You will need to determine the type of statement and call the appropriate execution function
      switch (token.type) {
        case TOKEN_IDENTIFIER:
            executeAssignment(token);
            break;
        case TOKEN_KEYWORD:
            executeFunctionCall(token);
            break;
        default:
            // Invalid statement
            printf("Invalid statement\n");
            break;
}

void executeAssignment(Token token) {
    // Extract the variable name and value from the token
    char variable[MAX_IDENTIFIER_SIZE + 1];
    char value[MAX_BUFFER_SIZE];
    sscanf(token.lexeme, "%s :=", variable);
    sscanf(token.lexeme, "%*s %*s %[^\n]", value);

    // Update the variable value based on the right-hand side expression
    // In this example, we assume the variable is a text type
    if (strcmp(value, "input") == 0) {
        // Handle input case separately
        char inputBuffer[MAX_BUFFER_SIZE];
        printf("Enter value for %s: ", variable);
        fgets(inputBuffer, MAX_BUFFER_SIZE, stdin);
        inputBuffer[strcspn(inputBuffer, "\n")] = '\0';  // Remove trailing newline character
        // Update the variable with the input value
        // TODO: Update the variable value based on your implementation
    } else {
        // Handle constant value assignment
        // TODO: Update the variable value based on the constant value
    }
}

void executeFunctionCall(Token token) {
    // Extract the function name and arguments from the token
    char function[MAX_IDENTIFIER_SIZE + 1];
    char arguments[MAX_BUFFER_SIZE];
    sscanf(token.lexeme, "%s %[^\n]", function, arguments);

    // Handle different predefined functions and their execution
    if (strcmp(function, "size") == 0) {
        // Handle the size() function
        // TODO: Extract the required argument(s) from the arguments string and perform the size() function logic
    } else if (strcmp(function, "subs") == 0) {
        // Handle the subs() function
        // TODO: Extract the required argument(s) from the arguments string and perform the subs() function logic
    } else if (strcmp(function, "locate") == 0) {
        // Handle the locate() function
        // TODO: Extract the required argument(s) from the arguments string and perform the locate() function logic
    } else if (strcmp(function, "insert") == 0) {
        // Handle the insert() function
        // TODO: Extract the required argument(s) from the arguments string and perform the insert() function logic
    } else if (strcmp(function, "override") == 0) {
        // Handle the override() function
        // TODO: Extract the required argument(s) from the arguments string and perform the override() function logic
    } else if (strcmp(function, "asString") == 0) {
        // Handle the asString() function
        // TODO: Extract the required argument(s) from the arguments string and perform the asString() function logic
    } else if (strcmp(function, "asText") == 0) {
        // Handle the asText() function
        // TODO: Extract the required argument(s) from the arguments string and perform the asText() function logic
    } else {
        // Handle unrecognized function calls
        // TODO: Handle the case when the function is not recognized
    }
}


void executeSize(Token token) {
    // Extract the argument from the token
    char argument[MAX_BUFFER_SIZE];
    sscanf(token.lexeme, "%*s %s", argument);

    // Perform the size() function logic
    // TODO: Extract the required variable from the argument and calculate its size
}

void executeSubs(Token token) {
    // Extract the arguments from the token
    char argument[MAX_BUFFER_SIZE];
    int begin, end;
    sscanf(token.lexeme, "%*s %[^,], %d, %d", argument, &begin, &end);

    // Perform the subs() function logic
    // TODO: Extract the required variables and perform the substring operation using begin and end values
}

void executeLocate(Token token) {
    // Extract the arguments from the token
    char bigText[MAX_BUFFER_SIZE];
    char smallText[MAX_BUFFER_SIZE];
    int start;
    sscanf(token.lexeme, "%*s %[^,], %[^,], %d", bigText, smallText, &start);

    // Perform the locate() function logic
    // TODO: Extract the required variables and perform the locate operation using start value
}

void executeInsert(Token token) {
    // Extract the arguments from the token
    char myText[MAX_BUFFER_SIZE];
    int location;
    char insertText[MAX_BUFFER_SIZE];
    sscanf(token.lexeme, "%*s %[^,], %d, %[^,]", myText, &location, insertText);

    // Perform the insert() function logic
    // TODO: Extract the required variables and perform the insert operation at the specified location
}


void executeOverride(Token token) {
    // Extract the arguments from the token
    char myText[MAX_BUFFER_SIZE];
    int location;
    char ovrText[MAX_BUFFER_SIZE];
    sscanf(token.lexeme, "%*s %[^,], %d, %[^,]", myText, &location, ovrText);

    // Perform the override() function logic
    // TODO: Extract the required variables and perform the override operation at the specified location
}

void executeAsString(Token token) {
    // Extract the argument from the token
    int myInt;
    sscanf(token.lexeme, "%*s %d", &myInt);

    // Perform the asString() function logic
    // TODO: Extract the required variable and perform the type conversion to string
}


void executeAsText(Token token) {
    // Extract the argument from the token
    char myString[MAX_BUFFER_SIZE];
    sscanf(token.lexeme, "%*s %[^;]", myString);

    // Perform the asText() function logic
    // TODO: Extract the required variable and perform the type conversion of myString to an integer
}

void executeRead(Token token) {
    // Extract the arguments from the token
    char myString[MAX_BUFFER_SIZE];
    char filename[MAX_BUFFER_SIZE];
    sscanf(token.lexeme, "%*s %[^,], %[^\n]", myString, filename);

    // Perform the read command logic
    // TODO: Read a string from the specified file and assign it to myString
}

void executeWrite(Token token) {
    // Extract the arguments from the token
    char myText[MAX_BUFFER_SIZE];
    char filename[MAX_BUFFER_SIZE];
    sscanf(token.lexeme, "%*s %[^,], %[^\n]", myText, filename);

    // Perform the write command logic
    // TODO: Write the string myText to the specified file
}


void executeInput(Token token) {
    // Extract the arguments from the token
    char myText[MAX_BUFFER_SIZE];
    char promptText[MAX_BUFFER_SIZE];
    sscanf(token.lexeme, "%*s %[^,], %[^\n]", myText, promptText);

    // Perform the input command logic
    // TODO: Receive input from the user into myText using promptText as the prompt
}

void executeOutput(Token token) {
    // Extract the argument from the token
    char myText[MAX_BUFFER_SIZE];
    sscanf(token.lexeme, "%*s %[^\n]", myText);

    // Perform the output command logic
    // TODO: Write myText to the screen or console
}


int main(int argc, char* argv[]) {
    if (argc != 2) {
        printf("Error: Invalid command line arguments.\n");
        printf("Usage: TextJedi <filename>\n");
        return 1;
    }
    
    FILE* file = fopen(argv[1], "r");
    
    if (file == NULL) {
        printf("Error: Failed to open file.\n");
        return 1;
    }
    
    parseProgram(file);
    
    fclose(file);
    
    return 0;
}