yacc_badargs.py (4479:61d3ed46e373) yacc_badargs.py (6498:e21e9ab5fad0)
1# -----------------------------------------------------------------------------
2# yacc_badargs.py
3#
4# Rules with wrong # args
5# -----------------------------------------------------------------------------
6import sys
7sys.tracebacklimit = 0
8sys.path.insert(0,"..")

--- 12 unchanged lines hidden (view full) ---

21names = { }
22
23def p_statement_assign(t,s):
24 'statement : NAME EQUALS expression'
25 names[t[1]] = t[3]
26
27def p_statement_expr():
28 'statement : expression'
1# -----------------------------------------------------------------------------
2# yacc_badargs.py
3#
4# Rules with wrong # args
5# -----------------------------------------------------------------------------
6import sys
7sys.tracebacklimit = 0
8sys.path.insert(0,"..")

--- 12 unchanged lines hidden (view full) ---

21names = { }
22
23def p_statement_assign(t,s):
24 'statement : NAME EQUALS expression'
25 names[t[1]] = t[3]
26
27def p_statement_expr():
28 'statement : expression'
29 print t[1]
29 print(t[1])
30
31def p_expression_binop(t):
32 '''expression : expression PLUS expression
33 | expression MINUS expression
34 | expression TIMES expression
35 | expression DIVIDE expression'''
36 if t[2] == '+' : t[0] = t[1] + t[3]
37 elif t[2] == '-': t[0] = t[1] - t[3]
38 elif t[2] == '*': t[0] = t[1] * t[3]
30
31def p_expression_binop(t):
32 '''expression : expression PLUS expression
33 | expression MINUS expression
34 | expression TIMES expression
35 | expression DIVIDE expression'''
36 if t[2] == '+' : t[0] = t[1] + t[3]
37 elif t[2] == '-': t[0] = t[1] - t[3]
38 elif t[2] == '*': t[0] = t[1] * t[3]
39 elif t[3] == '/': t[0] = t[1] / t[3]
39 elif t[2] == '/': t[0] = t[1] / t[3]
40
41def p_expression_uminus(t):
42 'expression : MINUS expression %prec UMINUS'
43 t[0] = -t[2]
44
45def p_expression_group(t):
46 'expression : LPAREN expression RPAREN'
47 t[0] = t[2]
48
49def p_expression_number(t):
50 'expression : NUMBER'
51 t[0] = t[1]
52
53def p_expression_name(t):
54 'expression : NAME'
55 try:
56 t[0] = names[t[1]]
57 except LookupError:
40
41def p_expression_uminus(t):
42 'expression : MINUS expression %prec UMINUS'
43 t[0] = -t[2]
44
45def p_expression_group(t):
46 'expression : LPAREN expression RPAREN'
47 t[0] = t[2]
48
49def p_expression_number(t):
50 'expression : NUMBER'
51 t[0] = t[1]
52
53def p_expression_name(t):
54 'expression : NAME'
55 try:
56 t[0] = names[t[1]]
57 except LookupError:
58 print "Undefined name '%s'" % t[1]
58 print("Undefined name '%s'" % t[1])
59 t[0] = 0
60
61def p_error(t):
59 t[0] = 0
60
61def p_error(t):
62 print "Syntax error at '%s'" % t.value
62 print("Syntax error at '%s'" % t.value)
63
64yacc.yacc()
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63
64yacc.yacc()
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