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Code: Select all

using System;
using System.IO;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CPreProcessor
{
    public struct define
    {
        public string defName { get; set; }
        public string defValu { get; set; }
    }

    class PrePro
    {
        private string incDir = @"C:\cb\include\";
        private List<define> lsHash = new List<define>();
        //private StreamWriter sw;
        public PrePro(string fName)
        {
            //var fAux = fName.Split('.')[0] + ".ppo";
            //sw = new StreamWriter(fAux);
            parse(fName);
        }

        private void parse(string fileName)
        {
            var lines = File.ReadAllLines(fileName);

            foreach(var line in lines)
            {
                if (line.Trim().StartsWith("#include")) 
                {
                    var aux = line.Replace("#include", "").Trim();

                    if (aux[0] == '<')
                        parse(incDir + (aux.Remove(0, 1).Remove(aux.Length - 2, 1)));
                    else if (aux[0] == '"')
                        parse(aux.Remove(0, 1).Remove(aux.Length - 2, 1));
                    else
                        throw new Exception("Erro");
                }
                else if (line.Trim().StartsWith("#define"))
                {
                    define def = new define();
                    bool findName = false;

                    for(int i=7;i<line.Length;i++)
                    {
                        if (line[i] == ' ')
                            continue;

                        if (findName == true)
                        {
                            def.defValu = line.Substring(i, line.Length - i);
                            break;
                        }
                        else
                        {
                            var temp = "";
                            for (int j = i; j < line.Length; j++)
                            {
                                if (line[j] == ' ')
                                {
                                    def.defName = temp;
                                    findName = true;
                                    i = j; // mode the index to correctly local
                                    break;
                                }
                                else
                                    temp += line[j];
                            }
                        }
                    }
                    lsHash.Add(def);
                }
                else
                {
                    for(int i=0;i<line.Length;)
                    {
                        if(line[i] == '"')
                            for(int j=i;j<line.Length;j++)
                            {
                                if (line[j] != '"')
                                {
                                    Console.Write(line[j]);
                                    i++;
                                }
                                else
                                {
                                    Console.Write(line[j]); // just to print the "
                                    i++;
                                    break;
                                }
                            }
                        else if(Char.IsNumber(line[i]))
                        {
                            do
                            {
                                Console.Write(line[i]);
                                i++;
                                if (i >= line.Length)
                                {
                                    break;
                                }
                            } while (Char.IsNumber(line[i]) || line[i] == '.');
                        }
                        else if(Char.IsLetter(line[i]) || line[i] == '_')
                        {
                            var aux = "";
                            do
                            {
                                aux += line[i];
                                i++;
                                if (i >= line.Length)
                                {
                                    break;
                                }
                            } while (Char.IsLetterOrDigit(line[i]) || line[i] == '_');

                            var temp = lsHash.Where(k => k.defName == aux).Select(t => t);
                            if (temp.Count() > 0)
                                Console.Write(temp.First().defValu);
                            else
                                Console.Write(aux);
                        }
                        else
                        {
                            Console.Write(line[i]);
                            i++;
                        }
                    }
                    Console.Write('\n');
                }
            }
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            new PrePro("main.c");
        }
    }
}

Code: Select all

#include <stdio.h>

#define PI 3.14159

void main()
{
	int n;	// comment
	double sum = 0.0; /* comment */
  size_t test = 10;

	for (n = 1; n <= 10; n++) sum += PI / n;
	printf("sum = %.1f\n", sum);
}

Code: Select all

// stdio.h


typedef struct _FILE {
    char*  _ptr;
    int    _cnt;
    char*  _base;
    int    _flag;
    int    _file;
    int    _charbuf;
    int    _bufsiz;
    char*  _tmpfname;
} FILE;

__declspec(import) FILE _iob[];

void 	perror(const char *s);

int 	printf(char *format, ...);
int 	fprintf(FILE *fp, char *format, ...);
int 	sprintf(char *str, char *format, ...);

int 	scanf(char *format, ...);
int 	sscanf(const char *str, const char *format, ...);

FILE 	*fopen(char *filename, char *mode);
int 	fclose(FILE *stream);
char 	*fgets(char *s, int n, FILE *stream);
int 	fread(void *buf, int size, int n, FILE *fp);
int  fwrite(const void *buf, int size, int n, FILE *fp);
char 	*gets(char *s);
int 	getchar();
int 	putchar(int c);
int 	puts(const char *s);
int 	rename(const char *old, const char *new);
int     ungetc(int c, FILE *fp);


void main()
{
	int n;	// comment
	double sum = 0.0; /* comment */
  int test = 10;

	for (n = 1; n <= 10; n++) sum += 3.14159 / n;
	printf("sum = %.1f\n", sum);
}