pinarrkok / yacc-project

A sample yacc project.

Programming Language pin

Pinar Kok - 20160808013

Syntax

<if> ::= if (<expression>) <statement>

<while statement> ::= while (<expression>) <statement> 

<expression> ::= <expression> | <assignment>

<assignment operator> ::= =

<term> ::= <number> | <identifier>

<article> ::= <character> | <identifier>

<number> ::= <number> | <digit>

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

<boolean> ::= 1 | 0

<math operations> ::= + | - | * | /

<comparison operations> ::= < | > | != | <= | >= | == | && | || 

Explanations

• pin takes a file with extension “.pin”.

• It has if, else, while, print, printchar, comment etc.

• The token error is reserved for error handling. This can be used in grammer rules, to indicate where error might occur, and recovery take place. When an error is detected:

• If an error token is specified, the parser pop its stack until it finds a state where the error token is legal. It then behaves as if error is the current lookahead token, and performs the action encountered.

• If there is no rule using the error token, processing halts when an error is encountered.

• You can run the test program by running the makefile and giving it to “pin” as input:

make ./pin
./pin < test.pin