circuit_compiler/grama.py at master · 1phan/circuit_compiler · GitHub

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'''
sentence    :    statement SEMIC sentence
            |    empty
statement   : statement_b
            | statement_op

statement_b :    IF iexpression THEN iblock END
            |    IF iexpression THEN iblock ELSE eblock END

statement_op:   word

iblock      :    istat SEMIC iblock
            |    empty
istat       :    statement_b
            |    iword
iword       :    ID ASSIGN expression
            |    INT ID

eblock      :    estat SEMIC eblock
            |    empty
estat       :    statement_b
            |    eword
eword       :    ID ASSIGN expression
            |    INT ID
iexpression :    expression

word        :    ID ASSIGN expression
            |    INT ID
expression  :    expression PLUS term
            |    expression MINUS term
            |    expression AND term
            |    expression XOR term
            |    INV term
            |    term
term        :    term TIMES factor
            |   term DIVIDE factor
            |   factor
factor      :   NUMBER
            |   LPAREN expression RPAREN
            |   ID

- 1.

Can not declare variables with same name in the hole code.
for a error example:
    if a-3
    then
        int b;
        b = 1;
    else
        int b;  <---------- gramma DO NOT support this kind of behavior.
        b = 2;
if you do something like this, if a != 3, then b will be covered to 0. if a == 3, then b will be 2.
'''