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Creating a Command Line Parser

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Creating a Command Line Parser

 
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  #1
Feb 3rd, 2007
I need help developing a program that acts as a command line parser. Essentially, my program needs to ask the user to input a command line: eg - A+B=C. It will then output the following:
A
+
B
=
C.

Although this seems basic, my program needs to recognize different groups of characters and output them correctly. The following are examples my program needs to take into consideration:

1) ABKLJFDLKJLKKDFJ++++++ajkadsl;fkjld;akjk=====daskflj342343
1a)
ABKLJFDLKJLKKDFJ
++++++
ajkadsl
;
fkjld
;
akjk
=====
daskflj342343

Explanation: program groups letters and characters together, but moves to next line when a symbol is reached.

2) It also must recognize whitespace: A + B = C
2a)
A
+
B
=
C

3) It must recognize a matrix: D_1 = [1 3; 2 3 4; ; 4 5 6]
3a)
D_1
=
[1 3; 2 3 4; ; 4 5 6]

4) If the user forgets the second bracket to a matrix: D_1 = [1 3; 2 3 4; ; 4 5 6

4a)
D_1
=
Need ']' to close matrix

5) A regular sentence: Hello How are you
5a)
Hello
How
are
you

6) Anything including invalid segments. The only valid operator segments are +-/* Invalid operator segments could be: +%-, +&!
Valid number segments can start with '.' or a digit. an invalid number would be: 3.abc, which should be parsed as 3. and then abc. Only numbers, whitespace, and ';' should be allowed in the whitespace. a sequence of ';' and ',' is valid: ;;;,;;;,,,;

I have worked on a pseudocode for the main part of my program thus far, and I think I have all the functions named within it that I would need. I was wondering if someone could help me develop the functions correctly for my program, thanks!

Below is my pseudocode:

c Syntax (Toggle Plain Text) 
  1. #include <iostream>
  2.  
  3. using std::cout;
  4. using std::cin;
  5. using std::endl;
  6.  
  7.  
  8. int main()
  9. {
  10.     cout << "        Welcome to My Command Line Parser!" << endl;
  11.     cout << "        XXXXXXXXXX, XXXXXXXXXXXXXXXXXXXXXX" << endl;
  12.     cout << "                   XXXXXXXX, 2007\n" << endl;
  13.     cout << "\n" << endl;
  14.     cout << "Input a Command Line\n";
  15.     cin.getline(buffer, 500);
  16.  
  17.     char piece[500];
  18.     int st = 0, ed = 0, err_code = 1;
  19.  
  20.         while( buffer[st]!=0 )
  21.         {
  22.             st = find_first_element( );
  23.             if (buffer[st] == 0) err_code = 0;
  24.  
  25.             ed = find_last_element( st ); // err_code can be set inside
  26.  
  27.             if (err_code == 0) break;
  28.             else 
  29.             {
  30.                 _copy_segment(piece, st, ed);
  31.                 _display_segment(piece);
  32.                 st = ed + 1;
  33.             }
  34.         }
  35.         return err_code;
  36.  
  37. }
  38.  
  39. //Functions
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Re: Creating a Command Line Parser

 
2
  #2
Feb 3rd, 2007
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Originally Posted by raydogg57 View Post
1) ABKLJFDLKJLKKDFJ++++++ajkadsl;fkjld;akjk=====daskflj342343
1a)
ABKLJFDLKJLKKDFJ
++++++
ajkadsl
;
fkjld
;
akjk
=====
daskflj342343

Explanation: program groups letters and characters together, but moves to next line when a symbol is reached.
Look at isalpha(), isalnum(), and isdigit() functions

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Originally Posted by raydogg57 View Post
2) It also must recognize whitespace: A + B = C
2a)
A
+
B
=
C
isspace() for this.

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Originally Posted by raydogg57 View Post
3) It must recognize a matrix: D_1 = [1 3; 2 3 4; ; 4 5 6]
3a)
D_1
=
[1 3; 2 3 4; ; 4 5 6]
Work on this last....

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Originally Posted by raydogg57 View Post
4) If the user forgets the second bracket to a matrix: D_1 = [1 3; 2 3 4; ; 4 5 6

4a)
D_1
=
Need ']' to close matrix
Keep a counter for each pair of [, {, ( seen. Inc at open, dec at close. If by the end of the input any are not 0 you have a mismatch.

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Originally Posted by raydogg57 View Post
5) A regular sentence: Hello How are you
5a)
Hello
How
are
you
What about them? Would aple banena charry be acceptable as a sentence? I think this would be beyond the scope of your program.

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Originally Posted by raydogg57 View Post
6) Anything including invalid segments. The only valid operator segments are +-/* Invalid operator segments could be: +%-, +&!
Valid number segments can start with '.' or a digit. an invalid number would be: 3.abc, which should be parsed as 3. and then abc. Only numbers, whitespace, and ';' should be allowed in the whitespace. a sequence of ';' and ',' is valid: ;;;,;;;,,,;
Make your own isXXX() function, like isoperator() and you will have to define a set of rules and program for them.
The 3 Laws of the Procrastination Society:
1) Never do today that which can be put off until tomorrow
2) Tomorrow never comes
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Re: Creating a Command Line Parser

 
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  #3
Feb 4th, 2007
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Originally Posted by WaltP View Post
What about them? Would aple banena charry be acceptable as a sentence? I think this would be beyond the scope of your program.
Yes, aple benena charry would be acceptable as a sentence. my program doesn't have to recognize real words.

I am having trouble implementing all this with the current arrangement I have. I looked up the functions you suggested to me and understand what they do. But I am unclear as to how to implement them into my main function. am I going to have to do some sort of 'if' statement?

c Syntax (Toggle Plain Text) 
  1.  if isalpha() = 0
  2.                   { cout << endl;
  3.                 }

I'm just really confused as to where I need to begin with this current program that I have and am not sure where to start. thanks!
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Re: Creating a Command Line Parser

 
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  #4
Feb 5th, 2007
Basically, yes. But use the proper syntax for your if
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2) Tomorrow never comes
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Re: Creating a Command Line Parser

 
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  #5
Feb 5th, 2007
help! this is due in a couple of hours and I just have a problem with the matrix. even when the matrix is valid my code says it is invalid, can anyone help? thanks!

c Syntax (Toggle Plain Text) 
  1. #include <iostream>
  2.  
  3.  
  4. using std::cout;
  5. using std::cin;
  6. using std::endl;
  7.  
  8.  
  9. bool Word_Tracker(char a);
  10. bool Symbol_Digit_Word_Tracker(char a);
  11. bool Operator_Checker(char a);
  12. bool Number_Checker(char a);
  13. bool Is_Matrix(char a);
  14. bool Characters_Allowed_Matrix(char a);
  15. bool Comma_Semicolon(char a);
  16. void Clears(char a[], int size);
  17. void First_Whitespace(char a[], int& pos);
  18. void Display(char a[]);
  19.  
  20. int main()
  21. {
  22.     char string[500];
  23.     cout << "          Welcome to My Command Line Parser!" << endl;
  24.     cout << "        Raymond Guido, Northwestern University" << endl;
  25.     cout << "                   Copyright, 2007\n" << endl;
  26.     cout << "\n" << endl;
  27.     cout << "Input a Command Line\n";
  28.     cin.getline(string, 500);
  29.  
  30.     int x = 0;
  31.     char word[500] = {0};
  32.     char oper_ator[500] = {0};
  33.     char number[500] = {0};
  34.     char matrix[500] = {0};
  35.     char comma_semicolon[500] = {0};
  36.  
  37.  
  38.         while( string[x]!=0 )
  39.         {
  40.                 First_Whitespace(string,x);
  41.  
  42.                 if (Operator_Checker(string[x]) == true)
  43.                 {
  44.                     while (Operator_Checker(string[x]) == true)
  45.                     {
  46.                     oper_ator[x]= string[x];
  47.                     x ++;
  48.                     }
  49.                 Display(oper_ator);
  50.                 Clears(oper_ator,500);
  51.                 }
  52.  
  53.                 else if (Word_Tracker(string[x]) == true)
  54.                 {
  55.                     while ((Word_Tracker(string[x]) == true || Symbol_Digit_Word_Tracker(string[x]) == true))
  56.                     {
  57.                     word[x]= string[x];
  58.                     x ++;
  59.                     }
  60.                 Display(word);
  61.                 Clears(word,500);
  62.                 }
  63.  
  64.                 else if (Number_Checker(string[x]) == true)
  65.                 {
  66.                     while (Number_Checker(string[x]) == true)
  67.                     {
  68.                         number[x]= string[x];
  69.                         x ++;
  70.                     }
  71.                 Display(number);
  72.                 Clears(number,500);
  73.                 }
  74.  
  75.                 else if (Is_Matrix(string[x]) == true)
  76.                 {
  77.                     while (Is_Matrix(string[x]) == true || Characters_Allowed_Matrix(string[x]) == true)
  78.                     {
  79.                     matrix[x]= string[x];
  80.                     x ++;
  81.                     }
  82.                     if ( string[x] == ']')
  83.                     {
  84.                     matrix[x]= string[x];
  85.                     x ++;
  86.                     Display(matrix);
  87.                     Clears(matrix,500);
  88.                     }
  89.                     else
  90.                     {
  91.                     cout << "Invalid Matrix" << endl;
  92.                     break;
  93.                     }
  94.                 }
  95.  
  96.                 else if (Comma_Semicolon(string[x]) == true)
  97.                 {
  98.                     while (Comma_Semicolon(string[x]) == true)
  99.                     {
  100.                     comma_semicolon[x]= string[x];
  101.                     x ++;
  102.                     }
  103.                 Display(comma_semicolon);
  104.                 Clears(comma_semicolon,500);
  105.                 }
  106.  
  107.                 else
  108.                 {
  109.                 cout  << "\n" <<"You have entered invalid operators";
  110.                 break;
  111.                 }
  112.         }
  113.  
  114.  
  115.     cout  << "\n" << "Command Line Separated" << endl;
  116. }
  117. //Functions
  118.  
  119. void First_Whitespace(char a[], int& pos)
  120. {
  121.     while(a[pos]==' ')
  122.     {
  123.         pos ++;
  124.     }
  125. }
  126. bool Comma_Semicolon(char a)
  127. {
  128.     bool b;
  129.     if ((a == ';') || (a == ','))
  130.     {
  131.         b = true;
  132.         return b;
  133.     }
  134.     else
  135.     {
  136.         b = false;
  137.         return b;
  138.     }
  139. }
  140. bool Number_Checker(char a)
  141. {
  142.     bool b;
  143.     if ((a == '.') || (a >= '0' && a <= '9'))
  144.     {
  145.         b = true;
  146.         return b;
  147.     }
  148.     else
  149.     {
  150.         b = false;
  151.         return b;
  152.     }
  153. }
  154. bool Operator_Checker(char a)
  155. {
  156.     bool b;
  157.     if ((a == '+') || (a == '-') || (a == '*')
  158.         || (a == '/') || (a == '='))
  159.     {
  160.         b = true;
  161.         return b;
  162.     }
  163.     else
  164.     {
  165.         b = false;
  166.         return b;
  167.     }
  168. }
  169. bool Word_Tracker(char a)
  170. {
  171.     bool b;
  172.     if ((a >= 'A' && a <= 'Z') || (a >= 'a' && a <= 'z'))
  173.     {
  174.         b = true;
  175.         return b;
  176.     }
  177.     else
  178.     {
  179.         b = false;
  180.         return b;
  181.     }
  182. }
  183. bool Symbol_Digit_Word_Tracker(char a)
  184. {
  185.     bool b;
  186.     if ((a == '.') || (a == ',') || (a== '_') || (a >= '0' && a <= '9'))
  187.     {
  188.         b = true;
  189.         return b;
  190.     }
  191.     else
  192.     {
  193.         b = false;
  194.         return b;
  195.     }
  196. }
  197. bool Is_Matrix(char a)
  198. {
  199.     bool b;
  200.     if (a == '[')
  201.     {
  202.         b = true;
  203.         return b;
  204.     }
  205.     else
  206.     {
  207.         b = false;
  208.         return b;
  209.     }
  210. }
  211. bool Characters_Allowed_Matrix(char a)
  212. {
  213.     bool b;
  214.     if ((a == ' ') || (a >= 0 && a <= 9) || (a == ';'))
  215.     {
  216.         b = true;
  217.         return b;
  218.     }
  219.     else
  220.     {
  221.         b = false;
  222.         return b;
  223.     }
  224. }
  225.  
  226. void Clears(char a[], int c)
  227. {
  228.     for(int b=0; b<c; b++)
  229.         a[b] = 0;
  230. }
  231.  
  232. void Display(char a[])
  233. {
  234.     char *b = a;
  235.     while( *b == 0)
  236.     {
  237.         b ++;
  238.     }
  239.     cout << b << endl;
  240. }
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Re: Creating a Command Line Parser

 
0
  #6
Feb 6th, 2007
You need to put single quotes around 0 and 9 for them to be treated as characters...

C++ Syntax (Toggle Plain Text) 
  1. bool Characters_Allowed_Matrix(char a)
  2. {
  3.     bool b;
  4.     if ((a == ' ') || (a >= '0' && a <= '9') || (a == ';'))
  5.     {
  6.         b = true;
  7.         return b;
  8.     }
  9.     else
  10.     {
  11.         b = false;
  12.         return b;
  13.     }
  14. }
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