def __init__(self, toklist): self.headsym = symbol.Env() self.cursym = None self.tokens = toklist
def initSymbolTable(self, symtab=None):
if symtab == None:
self.symtab = sym.Env()
else:
self.symtab = symtab
# Build the lexer
import ply.lex as lex
lex.lex()
# Parsing rules
precedence = (
('left', '+', '-'),
('left', '*', '/'),
('right', 'UMINUS'),
)
# Initialize symbol table
symtab = symbol.Env()
def p_statement_assign(p):
'statement : ID "=" expression SEMICOLON'
# names[p[1]] = p[3]
symtab.update(p[1], p[3])
def p_statement_declr_assign(p):
'statement : declaration ID "=" expression SEMICOLON'
# names[p[2]] = p[4]
symtab.put(p[2], p[1], p[4])
def p_statement_cout(p):
def pushScope(self, symtab=None):
if symtab == None:
new_symtab = sym.Env()
else:
new_symtab = copy.deepcopy(symtab) # XXX This looks dangerous...
self.symstack.append(new_symtab)
def __init__(self, toklist): self.headsym = symbol.Env() self.cursym = None self.tokens = toklist self.ast = None # this member is set to the root of the AST after parsing