def _term(caller_node):
ice9_parser_global.logger.debug("Entering _term")
term_node = ice9_node.expr_node()
term_node.operation = ice9_parser_global.tok.type
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
# Set pre child to caller node
term_node.pre_child = caller_node
# Set post child to factor node
if in_first_of_factor() == True:
factor_node = factor()
term_node.post_child = factor_node
else:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, "expecting a factor"
sys.exit()
# If caller_node was None, return the same value obtained in lower depth
if caller_node:
result_node = term_node
validate_term(result_node)
else:
result_node = term_node.post_child
if ice9_parser_global.tok.type in ['STAR', 'SLASH', 'MOD']:
result_node = _term(result_node)
ice9_parser_global.logger.debug("Exiting _term")
return result_node
def term(caller_node):
ice9_parser_global.logger.debug("Entering term")
# Set pre child to caller node
term_node = ice9_node.expr_node()
term_node.pre_child = caller_node
# Set post child to factor node
if in_first_of_factor() == True:
term_node.post_child = factor()
else:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, "expecting a factor"
sys.exit()
if caller_node:
result_node = term_node
validate_term(result_node)
else:
result_node = term_node.post_child
if ice9_parser_global.tok.type in ['STAR', 'SLASH', 'MOD']:
result_node = _term(result_node)
ice9_parser_global.logger.debug("Exiting term")
return result_node
def _mathexp(caller_node):
ice9_parser_global.logger.debug("Entering _mathexp")
math_node = ice9_node.expr_node()
math_node.operation = ice9_parser_global.tok.type
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
# Set pre child to caller node
math_node.pre_child = caller_node
# Set post child to term node
math_node.post_child = term(None)
if caller_node:
validate_mathexp(math_node)
result_node = math_node
else:
result_node = math_node.post_child
if ice9_parser_global.tok.type in ['PLUS', 'MINUS']:
result_node = _mathexp(result_node)
ice9_parser_global.logger.debug("Exiting _mathexp")
return result_node
def half_expr_or_assign(id_node):
ice9_parser_global.logger.debug("Entering half_expr_or_assign")
half_expr_or_assign_node = ice9_node.expr_node()
if ice9_parser_global.tok.type == 'LBRACK':
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
id_node.expr_list.append(expr(None))
# Array index must be of type int
if id_node.expr_list[-1].return_data_type != 'int':
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, \
"array index must be an 'int' operand"
sys.exit()
# Array index must have dimension 0
if id_node.expr_list[-1].dimension != 0:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, \
"array index cannot be an array reference"
sys.exit()
if ice9_parser_global.tok.type == 'RBRACK':
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
else:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, "expecting ']'"
sys.exit()
id_node.return_data_type = ice9_st_var.st_var[id_node.value][-1].basic_data_type
id_node.dimension = ice9_st_var.st_var[id_node.value][-1].dimension - len(id_node.expr_list)
if id_node.dimension < 0:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, \
"array dimension for variable '" + id_node.value + "'exceeded"
sys.exit()
half_expr_or_assign_node = half_expr_or_assign(id_node)
elif ice9_parser_global.tok.type == 'ASSIGN':
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
half_expr_or_assign_node.operation = 'ASSIGN'
half_expr_or_assign_node.pre_child = id_node
half_expr_or_assign_node.post_child = expr(None)
half_expr_or_assign_node = validate_assign(half_expr_or_assign_node)
else:
half_expr_or_assign_node = half_expr(id_node)
ice9_parser_global.logger.debug("Exiting half_expr_or_assign")
return half_expr_or_assign_node
def mathexp(caller_node):
ice9_parser_global.logger.debug("Entering mathexp")
math_node = ice9_node.expr_node()
math_node.pre_child = caller_node
math_node.post_child = term(None)
if caller_node:
validate_mathexp(math_node)
result_node = math_node
else:
result_node = math_node.post_child
if ice9_parser_global.tok.type in ['PLUS', 'MINUS']:
result_node = _mathexp(result_node)
ice9_parser_global.logger.debug("Exiting mathexp")
return result_node
def logicexp(caller_node):
ice9_parser_global.logger.debug("Entering logicexp")
logic_node = ice9_node.expr_node()
logic_node.operation = ice9_parser_global.tok.type
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
logic_node.pre_child = caller_node
logic_node.post_child = mathexp(None)
if caller_node:
result_node = logic_node
validate_logicexp(logic_node)
else:
result_node = logic_node.post_child
ice9_parser_global.logger.debug("Exiting logicexp")
return result_node
def statements():
ice9_parser_global.logger.debug("Entering statements")
stmt_node = ice9_node.stmt_node()
stmt_node_list = list()
# CODE-GENERATED
if ice9_parser_global.tok.type == 'IF':
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
stmt_node = ice9_parser_if.handle_if()
# CODE-GENERATED
elif ice9_parser_global.tok.type == 'DO':
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
stmt_node = ice9_parser_loops.do()
# CODE-GENERATED
elif ice9_parser_global.tok.type == 'FA':
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
stmt_node = ice9_parser_loops.fa()
# CODE-GENERATED
elif ice9_parser_global.tok.type == 'EXIT':
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
stmt_node.rule = 'EXIT'
# CODE-GENERATED
elif ice9_parser_global.tok.type == 'BREAK':
stmt_node.rule = ice9_parser_global.tok.type
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
if stmt_node.rule == 'BREAK' and ice9_parser_global.loop_depth < 1:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, \
"break statement permitted only inside loops"
sys.exit()
if ice9_parser_global.tok.type == 'SEMI':
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
else:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, "expecting ';'"
sys.exit()
# CODE-GENERATED
elif ice9_parser_global.tok.type == 'SEMI':
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
# CODE-GENERATED
elif ice9_parser_global.tok.type == 'MINUS':
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
expr_node = ice9_node.expr_node()
expr_node.pre_child = ice9_parser_expressions.expr(None)
expr_node.operation = 'UN_MINUS'
expr_node.operand_data_type = expr_node.pre_child.return_data_type
expr_node.dimension = expr_node.pre_child.dimension
# Check if the operand are either bool or int
if expr_node.operand_data_type not in ['bool', 'int']:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, \
"unary minus operator expects a 'bool' or 'int' operand"
sys.exit()
# Check if the operands have dimension 0
if expr_node.dimension != 0:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, \
"unary minus operator does not expect array datatypes"
sys.exit()
expr_node.return_data_type = expr_node.operand_data_type
stmt_node.pre_child = expr_node
stmt_node.rule = 'UN_MINUS'
if ice9_parser_global.tok.type == 'SEMI':
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
else:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, "expecting ';'"
sys.exit()
# CODE-GENERATED
elif ice9_parser_global.tok.type == 'QUEST':
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
expr_node = ice9_node.expr_node()
expr_node.pre_child = ice9_parser_expressions.expr(None)
expr_node.operation = 'QUEST'
expr_node.operand_data_type = expr_node.pre_child.return_data_type
expr_node.dimension = expr_node.pre_child.dimension
# Check if the operand is bool
if expr_node.operand_data_type != 'bool':
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, \
"unary ? operator expects a 'bool' operand"
sys.exit()
# Check if the operands have dimension 0
if expr_node.dimension != 0:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, \
"unary ? operator does not expect array datatypes"
sys.exit()
expr_node.return_data_type = 'int'
stmt_node.pre_child = expr_node
stmt_node.rule = 'QUEST'
if ice9_parser_global.tok.type == 'SEMI':
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
else:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, "expecting ';'"
sys.exit()
# CODE-GENERATED
elif ice9_parser_global.tok.type in ['WRITE', 'WRITES']:
stmt_node.rule = ice9_parser_global.tok.type
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
stmt_node.pre_child = ice9_parser_expressions.expr(None)
# Check if the operands have dimension 0
if stmt_node.pre_child.dimension != 0:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, \
"write(s) operator does not expect array datatypes"
sys.exit()
if ice9_parser_global.tok.type == 'SEMI':
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
else:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, "expecting ';'"
sys.exit()
# CODE-GENERATED
elif ice9_parser_global.tok.type == 'ID':
id_node = ice9_node.expr_node()
id_node.value = ice9_parser_global.tok.value
id_node.operation = 'ID'
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
#Look ahead and determine if operation was proc_call, then set id_node properties from st_proc
if ice9_parser_global.tok.type == 'LPAREN':
if id_node.value not in ice9_st_proc.st_proc:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, \
"procedure '" + id_node.value + "' not defined"
sys.exit()
id_node.return_data_type = ice9_st_proc.st_proc[id_node.value].return_type
id_node.dimension = 0
#If not, set id_node properties from st_var
else:
if id_node.value not in ice9_st_var.st_var:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, \
"variable '" + id_node.value + "' not defined"
sys.exit()
id_node.return_data_type = ice9_st_var.st_var[id_node.value][-1].basic_data_type
id_node.dimension = ice9_st_var.st_var[id_node.value][-1].dimension
result_node = ice9_parser_expressions.assign_or_expr(id_node)
stmt_node = ice9_node.stmt_node()
stmt_node.pre_child = result_node
stmt_node.rule = 'EXPR'
if ice9_parser_global.tok.type == 'SEMI':
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
else:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, "expecting ';'"
sys.exit()
# CODE-GENERATED
elif ice9_parser_global.tok.type == 'LPAREN':
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
expr_node = ice9_parser_expressions.expr()
if ice9_parser_global.tok.type == 'RPAREN':
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
else:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, "expecting ')'"
sys.exit()
result_node = ice9_parser_expressions.half_expr(expr_node)
if ice9_parser_global.tok.type == 'SEMI':
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
else:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, "expecting ';'"
stmt_node.pre_child = expr_node
stmt_node.rule = 'EXPR'
# CODE-GENERATED
elif ice9_parser_global.tok.type in ['INT', 'FALSE', 'TRUE']:
stmt_node.rule = ice9_parser_global.tok.type
# Create node for the first entity
expr_node = ice9_node.expr_node()
expr_nodedimension = 0
expr_node.value = ice9_parser_global.tok.value
expr_node.operation = ice9_parser_global.tok.type;
if ice9_parser_global.tok.type == 'INT':
expr_node.return_data_type = 'int'
else:
expr_node.return_data_type = 'bool'
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
# Get the entire expression tree from half_expr
result_node = ice9_parser_expressions.half_expr(expr_node)
# Attach expression tree to stmt_node
stmt_node.pre_child = result_node
# CODE-GENERATED
elif ice9_parser_global.tok.type == 'SLIT':
stmt_node.rule = 'EXPR'
stmt_node.pre_child = ice9_node.expr_node()
stmt_node.pre_child.operation = 'SLIT'
stmt_node.pre_child.return_data_type = 'string'
stmt_node.pre_child.operand_data_type = 'string'
stmt_node.pre_child.value = str(ice9_parser_global.tok.value)
stmt_node.pre_child.dimension = 0
stmt_node.pre_child.length = len(stmt_node.pre_child.value) - 2
if ice9_parser_global.tok.value not in ice9_parser_global.string_location_dict:
ice9_parser_global.string_location_dict[ice9_parser_global.tok.value] = ice9_parser_global.string_location_pointer
ice9_parser_global.string_location_pointer += stmt_node.pre_child.length
ice9_parser_global.string_location_pointer += 1
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
# CODE-GENERATED
elif ice9_parser_global.tok.type == 'READ':
stmt_node.rule = 'READ'
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
# Handle post-child
stmt_node.pre_child = ice9_parser_expressions.expr(None)
if stmt_node.pre_child.operation not in ['ID', 'ARRAY_REF']:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, \
"read can be performed only on variables, not expressions"
sys.exit()
if ice9_parser_global.tok.type == 'SEMI':
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
else:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, "expecting ';'"
sys.exit()
stmt_node_list.append(stmt_node)
if in_first_of_statement():
stmt_node_list += statements()
ice9_parser_global.logger.debug("Exiting statements")
return stmt_node_list
def fa():
ice9_parser_global.logger.debug("Entering fa")
stmt_node = ice9_node.stmt_node()
stmt_node.rule = 'FA'
ice9_parser_global.loop_depth += 1
if ice9_parser_global.tok.type == 'ID':
fa_loop_id = ice9_parser_global.tok.value
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
else:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, "expecting id"
sys.exit()
loop_id_node = ice9_node.expr_node()
loop_id_node.operation = 'LOOP_ID'
loop_id_node.value = fa_loop_id
if ice9_parser_global.tok.type == 'ASSIGN':
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
else:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, "expecting ':='"
sys.exit()
loop_id_node.pre_child = ice9_parser_expressions.expr(None)
if loop_id_node.pre_child.return_data_type != 'int':
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, \
"fa loop variable must be a 'int'"
sys.exit()
if loop_id_node.pre_child.dimension != 0:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, \
"fa loop variable cannot be a array, must be a 'int'"
sys.exit()
if ice9_parser_global.tok.type == 'TO':
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
else:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, "expecting to"
sys.exit()
loop_id_node.post_child = ice9_parser_expressions.expr(None)
if loop_id_node.post_child.return_data_type != 'int':
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, \
"fa loop variable must be a 'int'"
sys.exit()
if loop_id_node.post_child.dimension != 0:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, \
"fa loop expression cannot be a array , must be a 'int'"
sys.exit()
ice9_parser_global.fa_loop_variable.append(fa_loop_id)
'''
Might be un-necessary
# Obtain the location to store the fa loop variable
if ice9_parser_global.scope[-1] == 'GLOBAL':
address = ice9_parser_global.get_next_global_address()
else:
address = ice9_st_proc.st_proc[ice9_parser_global.scope[-1]].parameter_count + 2 + \
ice9_st_proc.st_proc[ice9_parser_global.scope[-1]].local_variable_count
st_var_entry = ice9_st_var.st_var_entry('int', 0, address)
'''
st_var_entry = ice9_st_var.st_var_entry('int', 0, 1, 1)
st_var_entry.basic_data_type = 'int'
# Bypass the checks in st_var.add_entry_to_st_var
# If variable not previously used, make an entry for it
if fa_loop_id not in ice9_st_var.st_var:
fa_loop_id_stack = list()
ice9_st_var.st_var[fa_loop_id] = fa_loop_id_stack
ice9_st_var.st_var[fa_loop_id].append(st_var_entry)
if ice9_parser_global.tok.type == 'ARROW':
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
else:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, "expecting '->'"
sys.exit()
stmt_node.pre_child = loop_id_node
stmt_node.post_child = ice9_parser_statements.statements()
if ice9_parser_global.tok.type == 'AF':
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
else:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, "expecting af"
sys.exit()
# Clean up
ice9_parser_global.fa_loop_variable.pop()
ice9_parser_global.loop_depth -= 1
ice9_st_var.st_var[fa_loop_id].pop()
if len(ice9_st_var.st_var[fa_loop_id]) == 0:
del ice9_st_var.st_var[fa_loop_id]
ice9_parser_global.logger.debug("Exiting fa")
return stmt_node
def elseif_or_else():
ice9_parser_global.logger.debug("Entering elseif_or_else")
stmt_node = ice9_node.stmt_node()
stmt_node.rule = 'IF'
if ice9_parser_global.tok.type == 'ELSE':
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
# Create dummy expression that always evaluates to true
expr_node = ice9_node.expr_node()
expr_node.operation = 'TRUE'
expr_node.return_data_type = 'bool'
stmt_node.condition = expr_node
if ice9_parser_global.tok.type == 'ARROW':
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
else:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, "expecting '->'"
sys.exit()
if ice9_parser_statements.in_first_of_statement():
stmt_node.pre_child = ice9_parser_statements.statements()
else:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, "expecting a statement"
sys.exit()
else:
# Condition expression
expr_node = ice9_parser_expressions.expr(None)
if expr_node.return_data_type != 'bool':
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, \
"if condition must return a 'bool'"
sys.exit()
if expr_node.dimension != 0:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, \
"if condition cannot be a array variable, must return a 'bool'"
sys.exit()
stmt_node.condition = expr_node
if ice9_parser_global.tok.type == 'ARROW':
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
else:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, "expecting ';'"
sys.exit()
if ice9_parser_statements.in_first_of_statement():
stmt_node.pre_child = ice9_parser_statements.statements()
else:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, "expecting a statement"
sys.exit()
if ice9_parser_global.tok.type == 'BOX':
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
stmt_node.post_child = elseif_or_else()
ice9_parser_global.logger.debug("Exiting elseif_or_else")
return stmt_node
def factor():
ice9_parser_global.logger.debug("Entering factor")
expr_node = ice9_node.expr_node()
if ice9_parser_global.tok.type == 'MINUS':
expr_node.operation = 'UN_MINUS'
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
if in_first_of_factor() == True:
expr_node.pre_child = factor()
expr_node.operand_data_type = expr_node.pre_child.return_data_type
expr_node.dimension = expr_node.pre_child.dimension
# Check if the operand are either bool or int
if expr_node.operand_data_type not in ['bool', 'int']:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, \
"unary minus operator expects a 'bool' or 'int' operand"
sys.exit()
# Check if the operands have dimension 0
if expr_node.dimension != 0:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, \
"unary minus operator does not expect array datatypes"
sys.exit()
# If the operand data type is boolean, then it indicates a NOT operation
if expr_node.operand_data_type == 'bool':
expr_node.operation = 'NOT'
expr_node.return_data_type = expr_node.operand_data_type
else:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, "expecting a factor"
sys.exit()
elif ice9_parser_global.tok.type == 'QUEST':
expr_node.operation = 'QUEST'
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
if in_first_of_factor() == True:
expr_node.pre_child = factor()
expr_node.operand_data_type = expr_node.pre_child.return_data_type
expr_node.dimension = expr_node.pre_child.dimension
# Check if the operand is bool
if expr_node.operand_data_type != 'bool':
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, \
"unary minus operator expects a 'bool' or 'int' operand"
sys.exit()
# Check if the operands have dimension 0
if expr_node.dimension != 0:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, \
"unary minus operator does not expect array datatypes"
sys.exit()
expr_node.return_data_type = 'int'
else:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, "expecting a factor"
sys.exit()
elif ice9_parser_global.tok.type == 'LPAREN':
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
expr_node = expr(None)
if ice9_parser_global.tok.type == 'RPAREN':
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
else:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, "expecting ')'"
sys.exit()
elif ice9_parser_global.tok.type == 'INT':
expr_node.operation = 'INT'
expr_node.operand_data_type = 'int'
expr_node.return_data_type = 'int'
expr_node.dimension = 0
expr_node.value = ice9_parser_global.tok.value
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
elif ice9_parser_global.tok.type == 'SLIT':
expr_node.operation = 'SLIT'
expr_node.operand_data_type = 'string'
expr_node.return_data_type = 'string'
expr_node.value = str(ice9_parser_global.tok.value)
expr_node.dimension = 0
expr_node.length = len(expr_node.value) - 2
if ice9_parser_global.tok.value not in ice9_parser_global.string_location_dict:
ice9_parser_global.string_location_dict[ice9_parser_global.tok.value] = ice9_parser_global.string_location_pointer
ice9_parser_global.string_location_pointer += expr_node.length
ice9_parser_global.string_location_pointer += 1
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
elif ice9_parser_global.tok.type == 'TRUE':
expr_node.operation = 'TRUE'
expr_node.operand_data_type = 'bool'
expr_node.return_data_type = 'bool'
expr_node.dimension = 0
expr_node.value = 1
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
elif ice9_parser_global.tok.type == 'FALSE':
expr_node.operation = 'FALSE'
expr_node.operand_data_type = 'bool'
expr_node.return_data_type = 'bool'
expr_node.dimension = 0
expr_node.value = 0
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
elif ice9_parser_global.tok.type == 'READ':
expr_node.operation = 'READ'
expr_node.operand_data_type = 'int'
expr_node.return_data_type = 'int'
expr_node.dimension = 0
expr_node.value = 0
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
else:
if ice9_parser_global.tok.type == 'ID':
expr_node.value = ice9_parser_global.tok.value
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
else:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, "expecting id"
sys.exit()
# Procedure call
if ice9_parser_global.tok.type == 'LPAREN':
expr_node.operation = 'PROC_CALL'
expr_node.expr_list = optsuffix()
validate_proc_call(expr_node)
# Array variable
elif ice9_parser_global.tok.type == 'LBRACK':
expr_node.operation = 'ARRAY_REF'
expr_node.expr_list = optsuffix()
expr_node = validate_array_ref(expr_node)
# Regular variable
else:
expr_node.operation = 'ID'
# Check if variable has been declared
if expr_node.value not in ice9_st_var.st_var:
print "Line", ice9_parser_global.tok.lineno, ": on token", ice9_parser_global.tok.value, \
"variable '" + expr_node.value + "' not defined"
sys.exit()
expr_node.return_data_type = ice9_st_var.st_var[expr_node.value][-1].basic_data_type
expr_node.dimension = ice9_st_var.st_var[expr_node.value][-1].dimension
ice9_parser_global.logger.debug("Exiting factor")
return expr_node