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Cparser.py
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from scanner import Scanner
import AST
import TreePrinter
class Cparser(object):
def __init__(self):
self.scanner = Scanner()
self.scanner.build()
self.error_occured = False
tokens = Scanner.tokens
precedence = (
("nonassoc", 'IFX'),
("nonassoc", 'ELSE'),
("right", '='),
("left", 'OR'),
("left", 'AND'),
("left", '|'),
("left", '^'),
("left", '&'),
("nonassoc", '<', '>', 'EQ', 'NEQ', 'LE', 'GE'),
("left", 'SHL', 'SHR'),
("left", '+', '-'),
("left", '*', '/', '%'),
)
def p_error(self, p):
self.error_occured = True
if p:
print("Syntax error at line {0}, column {1}: LexToken({2}, '{3}')".format(p.lineno, self.scanner.find_tok_column(p), p.type, p.value))
else:
print('At end of input')
def p_program(self, p):
"""program : declarations fundefs instructions"""
p[0] = AST.Program(p[1], p[2], p[3])
p[0].line = self.scanner.lexer.lineno
if not self.error_occured:
pass
#p[0].printTree(0)
def p_declarations(self, p):
"""declarations : declarations declaration
| """
if len(p) > 1:
p[0] = AST.Declarations(p[1], p[2])
else:
p[0] = AST.Declarations(None, None)
p[0].line = self.scanner.lexer.lineno
def p_declaration(self, p):
"""declaration : TYPE inits ';'
| error ';' """
if len(p) > 3:
p[0] = AST.Declaration(p[1], p[2], None)
else:
p[0] = AST.Declaration(None, None, p[1])
p[0].line = self.scanner.lexer.lineno
def p_inits(self, p):
"""inits : inits ',' init
| init """
if len(p) > 2:
p[0] = AST.Inits(p[1], p[3])
else:
p[0] = AST.Inits(None, p[1])
p[0].line = self.scanner.lexer.lineno
def p_init(self, p):
"""init : ID '=' expression """
p[0] = AST.Init(p[1], p[3])
p[0].line = self.scanner.lexer.lineno
def p_instructions(self, p):
"""instructions : instructions instruction
| instruction """
if len(p) > 2:
p[0] = AST.Instructions(p[1], p[2])
else:
p[0] = AST.Instructions(None, p[1])
p[0].line = self.scanner.lexer.lineno
def p_instruction(self, p):
"""instruction : print_instr
| labeled_instr
| assignment
| choice_instr
| while_instr
| repeat_instr
| return_instr
| break_instr
| continue_instr
| compound_instr"""
p[0] = p[1]
p[0].line = self.scanner.lexer.lineno
def p_print_instr(self, p):
"""print_instr : PRINT expression ';'
| PRINT error ';' """
if isinstance(p[2], AST.Expression):
p[0] = AST.Print(p[2], None)
else:
p[0] = AST.Print(None, p[2])
p[0].line = self.scanner.lexer.lineno
def p_labeled_instr(self, p):
"""labeled_instr : ID ':' instruction """
p[0] = AST.Labeled(p[1], p[3])
p[0].line = self.scanner.lexer.lineno
def p_assignment(self, p):
"""assignment : ID '=' expression ';' """
p[0] = AST.Assignment(p[1], p[3])
p[0].line = self.scanner.lexer.lineno
def p_choice_instr(self, p):
"""choice_instr : IF '(' condition ')' instruction %prec IFX
| IF '(' condition ')' instruction ELSE instruction
| IF '(' error ')' instruction %prec IFX
| IF '(' error ')' instruction ELSE instruction """
if isinstance(p[3], AST.Condition):
if len(p) == 8 and p[6].lower() == "else":
ifNode = AST.If(p[3], p[5], None)
ifNode.line = self.scanner.lexer.lineno
elseNode = AST.Else(p[7])
elseNode.line = self.scanner.lexer.lineno
p[0] = AST.Choice(ifNode, elseNode)
else:
ifNode = AST.If(p[3], p[5], None)
ifNode.line = self.scanner.lexer.lineno
p[0] = AST.Choice(ifNode, None)
else:
if len(p) == 8 and p[6].lower() == "else":
ifNode = AST.If(None, p[5], p[3])
ifNode.line = self.scanner.lexer.lineno
elseNode = AST.Else(p[7])
elseNode.line = self.scanner.lexer.lineno
p[0] = AST.Choice(ifNode, elseNode)
else:
ifNode = AST.If(None, p[5], p[3])
ifNode.line = self.scanner.lexer.lineno
p[0] = AST.Choice(ifNode, None)
p[0].line = self.scanner.lexer.lineno
def p_while_instr(self, p):
"""while_instr : WHILE '(' condition ')' instruction
| WHILE '(' error ')' instruction """
if isinstance(p[3], AST.Condition):
p[0] = AST.While(p[3], p[5], None)
else:
p[0] = AST.While(None, p[5], p[3])
p[0].line = self.scanner.lexer.lineno
def p_repeat_instr(self, p):
"""repeat_instr : REPEAT instructions UNTIL condition ';' """
p[0] = AST.RepeatUntil(p[2], p[4])
p[0].line = self.scanner.lexer.lineno
def p_return_instr(self, p):
"""return_instr : RETURN expression ';' """
p[0] = AST.Return(p[2])
p[0].line = self.scanner.lexer.lineno
def p_continue_instr(self, p):
"""continue_instr : CONTINUE ';' """
p[0] = AST.Continue()
p[0].line = self.scanner.lexer.lineno
def p_break_instr(self, p):
"""break_instr : BREAK ';' """
p[0] = AST.Break()
p[0].line = self.scanner.lexer.lineno
def p_compound_instr(self, p):
"""compound_instr : '{' declarations instructions '}' """
p[0] = AST.Compound(p[2], p[3])
p[0].line = self.scanner.lexer.lineno
def p_condition(self, p):
"""condition : expression"""
p[0] = p[1]
p[0].line = self.scanner.lexer.lineno
def p_const(self, p):
"""const : INTEGER
| FLOAT
| STRING"""
p[0] = AST.Const(p[1])
p[0].line = self.scanner.lexer.lineno
def p_expression(self, p):
"""expression : const
| ID
| expression '+' expression
| expression '-' expression
| expression '*' expression
| expression '/' expression
| expression '%' expression
| expression '|' expression
| expression '&' expression
| expression '^' expression
| expression AND expression
| expression OR expression
| expression SHL expression
| expression SHR expression
| expression EQ expression
| expression NEQ expression
| expression '>' expression
| expression '<' expression
| expression LE expression
| expression GE expression
| '(' expression ')'
| '(' error ')'
| ID '(' expr_list_or_empty ')'
| ID '(' error ')' """
if len(p) == 2:
if isinstance(p[1], AST.Const):
p[0] = p[1]
else:
p[0] = AST.Id(p[1])
elif len(p) == 4:
if p[1] == "(":
if isinstance(p[2], AST.Expression):
p[0] = AST.ExpressionInParentheses(p[2], None)
else:
p[0] = AST.ExpressionInParentheses(None, p[2])
else:
p[0] = AST.BinExpr(p[1], p[2], p[3])
else:
if isinstance(p[3], AST.ExpressionList):
p[0] = AST.IdWithParentheses(p[1], p[3], None)
else:
p[0] = AST.IdWithParentheses(p[1], None, p[3])
p[0].line = self.scanner.lexer.lineno
def p_expr_list_or_empty(self, p):
"""expr_list_or_empty : expr_list
| """
if len(p) > 1:
p[0] = AST.ExpressionList(p[1], None)
else:
p[0] = AST.ExpressionList(None, None)
p[0].line = self.scanner.lexer.lineno
def p_expr_list(self, p):
"""expr_list : expr_list ',' expression
| expression """
if len(p) > 2:
p[0] = AST.ExpressionList(p[1], p[3])
else:
p[0] = AST.ExpressionList(None, p[1])
p[0].line = self.scanner.lexer.lineno
def p_fundefs(self, p):
"""fundefs : fundef fundefs
| """
if len(p) > 1:
p[0] = AST.FunctionDefinitions(p[1], p[2])
else:
p[0] = AST.FunctionDefinitions(None, None)
p[0].line = self.scanner.lexer.lineno
def p_fundef(self, p):
"""fundef : TYPE ID '(' args_list_or_empty ')' compound_instr """
p[0] = AST.FunctionDefinition(p[1], p[2], p[4], p[6])
p[0].line = self.scanner.lexer.lineno
def p_args_list_or_empty(self, p):
"""args_list_or_empty : args_list
| """
if len(p) > 1:
p[0] = AST.ArgumentList(p[1], None)
else:
p[0] = AST.ArgumentList(None, None)
p[0].line = self.scanner.lexer.lineno
def p_args_list(self, p):
"""args_list : args_list ',' arg
| arg """
if len(p) > 2:
p[0] = AST.ArgumentList(p[1], p[3])
else:
p[0] = AST.ArgumentList(None, p[1])
p[0].line = self.scanner.lexer.lineno
def p_arg(self, p):
"""arg : TYPE ID """
p[0] = AST.Argument(p[1], p[2])
p[0].line = self.scanner.lexer.lineno