772b2ab8ba
We had been using version 3.2 from 2009, which does not have support for t_eof(). Change-Id: Id5610a272fe2cecd586991f4c59f3ec77184164e Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/56342 Reviewed-by: Jason Lowe-Power <power.jg@gmail.com> Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu> Maintainer: Jason Lowe-Power <power.jg@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com>
81 lines
1.7 KiB
Python
81 lines
1.7 KiB
Python
# -----------------------------------------------------------------------------
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# yacc_error6.py
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#
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# Panic mode recovery test
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# -----------------------------------------------------------------------------
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import sys
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if ".." not in sys.path: sys.path.insert(0,"..")
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import ply.yacc as yacc
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from calclex import tokens
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# Parsing rules
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precedence = (
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('left','PLUS','MINUS'),
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('left','TIMES','DIVIDE'),
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('right','UMINUS'),
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)
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def p_statements(t):
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'statements : statements statement'
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pass
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def p_statements_1(t):
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'statements : statement'
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pass
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def p_statement_assign(p):
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'statement : LPAREN NAME EQUALS expression RPAREN'
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print("%s=%s" % (p[2],p[4]))
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def p_statement_expr(t):
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'statement : LPAREN expression RPAREN'
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print(t[1])
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def p_expression_binop(t):
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'''expression : expression PLUS expression
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| expression MINUS expression
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| expression TIMES expression
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| expression DIVIDE expression'''
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if t[2] == '+' : t[0] = t[1] + t[3]
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elif t[2] == '-': t[0] = t[1] - t[3]
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elif t[2] == '*': t[0] = t[1] * t[3]
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elif t[2] == '/': t[0] = t[1] / t[3]
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def p_expression_uminus(t):
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'expression : MINUS expression %prec UMINUS'
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t[0] = -t[2]
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def p_expression_number(t):
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'expression : NUMBER'
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t[0] = t[1]
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def p_error(p):
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if p:
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print("Line %d: Syntax error at '%s'" % (p.lineno, p.value))
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# Scan ahead looking for a name token
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while True:
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tok = parser.token()
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if not tok or tok.type == 'RPAREN':
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break
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if tok:
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parser.restart()
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return None
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parser = yacc.yacc()
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import calclex
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calclex.lexer.lineno=1
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parser.parse("""
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(a = 3 + 4)
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(b = 4 + * 5 - 6 + *)
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(c = 10 + 11)
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""")
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