Project #1 Solution

The first programming project involves writing a program that parses, using recursive descent, a GUI definition language defined in an input file and generates the GUI that it defines. The grammar for this language is defined below:




gui ::=




Window STRING '(' NUMBER ',' NUMBER ')' layout widgets End '.' layout ::=




Layout layout_type ':'

layout_type ::=

Flow |




Grid '(' NUMBER ',' NUMBER [',' NUMBER ',' NUMBER] ')' widgets ::=




widget widgets |

widget

widget ::=

Button STRING ';' |

Group radio_buttons End ';' |

Label STRING ';' |

Panel layout widgets End ';' |

Textfield NUMBER ';'

radio_buttons ::=

radio_button radio_buttons |

radio_button

radio_button ::=




Radio STRING ';'




In the above grammar, the red symbols are nonterminals, the blue symbols are tokens and the black punctuation symbols are BNF metasymbols. Among the tokens those in title case are keywords. The character literals are punctuation tokens.




Below is an explanation of the meaning of some of the symbols in the above productions that should help you understand the actions that are to be performed when each of the productions is parsed:




In the window production the string is the name that is to appear in the top border of the




window and the two numbers are the width and height of the window

In the production for layout_type that define the grid layout, the first two numbers represent




the number of rows and columns, and the optional next two the horizontal and vertical gaps In the production for widget that defines a button, the string is the name of the button




In the production for widget that defines a label, the string is text that is to be placed in the label In the production for widget that defines a text field, the number is the width of the text field




In the production for radio_button, the string is the label of the button




You parser should properly handle the fact that panels can be nested in other panels. Recursive productions must be implemented using recursion. Syntactically incorrect input files should detect and report the first error.




Below is an example of an input file:




Window "Calculator" (200, 200) Layout Flow:

Textfield 20;

Panel Layout Grid(4, 3, 5, 5):

Button "7";

Button "8";

Button "9";

Button "4";

Button "5";

Button "6";

Button "1";

Button "2";

Button "3";




Label "";

Button "0";

End;

End.




The above input file should produce the GUI shown below:










Deliverables:




Deliverables for this project include the following:




Source code correctly implementing all required functionality.
Word or PDF file providing screen shots of successfully compiling and executing the program.



Description of the process and lesson learned while completing this project (to be included in the Word or PDF document).



A test plan that contains test cases that include both layout types, all widgets and nested panels. For each test case, the input file should be shown together with the resulting GUI. (to be included in the Word or PDF document).


















2




Grading rubric:







Attribute
Meets
Does not meet
Functionality
40 points
0 points


Writes a program that parses an
Does not writes a program that parses


input file defining a GUI definition
an input file defining a GUI definition


language using recursive descent.
language using recursive descent.


Properly handles the fact that
Does not properly handle the fact that


panels can be nested in other
panels can be nested in other panels.


panels.






Does not implement recursive


Implements recursive productions
productions using recursion.


using recursion.











Input
20 points
0 points


Syntactically incorrect input files
Syntactically incorrect input files do


should detect and report the first
not detect and report the first error.


error.





Output
20 points
0 points


Generates the GUI that the input
Does not generate the GUI that the


file defines.
input file defines.






Documentation and
20 points
0 points
submissions
Includes source code correctly
Does not Include source code


implementing all required
correctly implementing all required


functionality.
functionality.


Includes Word or PDF file providing
Does not include Word or PDF file


screen shots of successfully
providing screen shots of successfully


compiling and executing the
compiling and executing the program.


program.






Does not include a description of the


Includes a description of the
process and lesson learned while


process and lesson learned while
completing this project (to be included


completing this project (to be
in the Word or PDF document).


included in the Word or PDF




document).












3


Includes a test plan that contains
Does not include a test plan that


test cases that include both layout
contains test cases that include both


types, all widgets and nested
layout types, all widgets and nested


panels. For each test case, the
panels. For each test case, the input


input file should be shown together
file should be shown together with the


with the resulting GUI. (to be
resulting GUI. (to be included in the


included in the Word or PDF
Word or PDF document).


document).







































































































































































4