def parse():
ice9_parser_global.logger.debug("Entering parse")
in_head = False
in_body = False
# Case for no input
if not ice9_parser_global.tok:
return
type = ice9_parser_global.tok.type
stmt_node_list = list()
ice9_parser_global.setup_code_generation()
while type != 'EOF':
in_head = False
if in_body == False:
if type == 'VAR':
in_head = True
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
ice9_parser_var.handle_var()
elif type == 'TYPE':
in_head = True
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
ice9_parser_type.handle_type()
elif type == 'FORWARD':
in_head = True
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
ice9_parser_forward.handle_forward()
elif type =='PROC':
in_head = True
ice9_parser_global.consume()
ice9_parser_global.logger.debug(ice9_parser_global.tok)
ice9_parser_proc.handle_proc()
if in_head == False:
ice9_parser_global.setup_stmt_section(ice9_parser_global.lno)
if ice9_parser_statements.in_first_of_statement() == True:
in_body = True
stmt_node_list += ice9_parser_statements.statements()
else:
print "Line", ice9_parser_global.tok.lineno, ": unexpected token -", ice9_parser_global.tok.value
sys.exit()
type = ice9_parser_global.tok.type
# Generate Code
for stmt in stmt_node_list:
stmt.generate_code()
ice9_parser_global.logger.debug("Exiting parse")
return
def handle_if():
ice9_parser_global.logger.debug("Entering handle_if")
stmt_node = ice9_node.stmt_node()
stmt_node.rule = 'IF'
# The 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()
if ice9_parser_global.tok.type == 'FI':
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 fi"
sys.exit()
ice9_parser_global.logger.debug("Exiting handle_if")
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
