In this homework, you are going to implement the SiNiR compiler. The details are as follows:

Given a file named calc.in, your program should check whether there are any syntax errors.  There will always be a file named calc.in  There will be no tab character in the file.

• If there is a syntax error,

◦ Create a new file, named calc.out and print “Dont Let Me Down” inside.

• If there are no syntax errors,

◦ Create a new file, named calc.out and print “Here Comes the Sun” inside.

• Do not print out anything to the terminal in the submitted file. in is composed of three parts. If one of those parts are missing, there is a syntax error.

	AnaDegiskenler	>>>>
	<init-statement><init-statement><init-statement>…. YeniDegiskenler <mid-statement<mid-statement<mid-statement ….. Sonuc <final-statement

The general structure of calc.in should be in the following form:

• Empty lines are allowed anywhere in the file.
• Spaces are allowed at any point unless specified. There should be no space in the shaded sequences. For example, there might be space before AnaDegiskenler or after; however there should be no space between <digit>.<digit>.
• The file should start with the AnaDegiskenler If not, there is a syntax error.
• There are zero or more <init-statement>s after AnaDegiskenler Each <init-statement> should be in a single line. If not, there is a syntax error.
• The file then continues with the YeniDegiskenler If not, there is a syntax error.
• There are zero or more <mid-statement>s after the YeniDegiskenler Each <mid-statement> should be in a single line. If not, there is a syntax error.
• The file continues with the Sonuc If not, there is a syntax error.
• There is zero or one <final-statement> after the Sonuc <final-statement> should be in a single line. If not, there is a syntax error.

Important:

• The language is case sensitive.
• Keywords cannot be used as variable names.

<init-statement>



is constructed by



<var-name> degeri <value> olsun









Any number of spaces (including space and tab) are allowed in <init-statement> <var-name> is composed of at most ten alpha-numeric characters The same variable cannot be assigned more than once.

<value> := <a-term> | <l-term>

◦ the above line means that <value> can be <a-term> or <l-term>











<a-term> := <digit> | <digit>.<digit> | <t-digit> | <t-digit> nokta <t-digit>

<digit> := 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9

<t-digit> := sifir | bir | iki | uc | dort | bes | alti | yedi | sekiz | dokuz

<l-term> := dogru | yanlis

If above rules do not hold, it’s syntax error.

<mid-statement>



is constructed by



<var-name> degeri <expression> olsun









Any number of spaces are allowed in <mid-statement> <var-name> is composed of at most ten alpha-numeric characters the same variable cannot be assigned more than once.

<expression> := <arith-expr> | <logic-expr>

◦ i.e. <expression> should be either <arith-expr> or <logic-expr>





<var-name> will be of type float if it is <arith-expr>

<var-name> will be of type boolean if it is <logic-expr>



<arith-exp> := <open-paran> <arith-exp> <close-paran>

:= <arith-exp> <binaop> <arith-exp>

:= <a-term>

:= <a-var-name>



<open-paran> := ( | ac-parantez



<clos-paran> := ) | kapa-parantez



<binaop> := + | – | * | arti | eksi | carpi





<a-var-name> should represent a variable of type int or float <a-var-name> should be defined in the previous lines.



<logic-exp> := <open-paran> <logic-exp> <close-paran>

:= <logic-exp> <binlop> <logic-exp>

:= <l-term>

:= <l-var-name>









<binlop> := ve | veya

<l-var-name> should represent a variable of type boolean <l-var-name> should be defined in the previous lines.

If above rules do not hold, it’s syntax error.



<final-statement> is constructed by:

<expression>







The same rules for <expression> apply (as above). Any number of spaces are allowed in <final-statement> If above rules do not hold, there is a syntax error.

Submission: You will submit a single python file over Moodle. Your .py file should be named with the underscore character (_) followed by your student number (e.g. _2019700030.py).

Your homework will be evaluated in different categories so that you can collect partial points:

A	Correctly parse the file without any <init-statement>, <midstatement>, <final-statement>	+5	If the code fails in this test case, the absolute grade will be zero
B	Correctly parse <init-statement>s composed of only integers	+10
C	Correctly parse <init-statement> composed of combination of integers, floats and booleans	+15
D	Correctly parse <mid-statement>s composed of only integers	+10	No variable is used on the right side of the statement (after degeri)
E	Correctly parse <mid-statement>s composed of combination of integers, floats, booleans	+15	No variable is used on the right side of the statement (after degeri)
F	Correctly parse <mid-statement>s composed of only integers and integer variables	+15	This requires also clearing B
G	Correctly parse <mid-statement>s composed of any operand	+15	This requires also clearing C
X	Correctly parse any file	+15	This requires also clearing G

Late Submission: Allowed with penalty: -% 10*(number_of_days_late)^2. Example case: You are 2 days late, and you got 90 from evaluation. You will get 90 * (1 – 0.4) = 54 as your final grade. You will get 0 if you are more than 3 days late.

Example calc.in files (more will be provided)

AnaDegiskenler x degeri 4 olsun x1 degeri 2 olsun a degeri dort olsun b degeri uc nokta dort olsun y degeri 8 olsun z degeri 3.2 olsun b1 degeri dogru olsun b2 degeri yanlis olsun YeniDegiskenler t1 degeri x + ( y ) – z olsun

t4 degeri x arti ac-parantez y kapa-parantez eksi z olsun t2 degeri ( t4 + ac-parantez ( ( y ) ) – z ) kapa-parantez olsun t3 degeri b1 ve b1 ve ( b2 veya b1 ) olsun

Sonuc x arti ac-parantez y kapa-parantez eksi z

AnaDegiskenler YeniDegiskenler

Sonuc