class SWExpressionParser(CloudScriptParser):
def __init__(self):
self.lexer = CloudScriptLexer()
self.lexer.build()
self.tokens = self.lexer.tokens
self.parser = ply.yacc.yacc(module=self, start='expression')
class SWScriptParser(CloudScriptParser):
def __init__(self):
self.lexer = CloudScriptLexer()
self.lexer.build()
self.tokens = self.lexer.tokens
self.parser = ply.yacc.yacc(module=self, start='script_file')
def __init__(self):
self.lexer = CloudScriptLexer()
self.lexer.build()
self.tokens = self.lexer.tokens
self.parser = ply.yacc.yacc(module=self, start='statement')
class CloudScriptParser:
def __init__(self):
self.lexer = CloudScriptLexer()
self.lexer.build()
self.tokens = self.lexer.tokens
self.parser = ply.yacc.yacc(module=self, start='script_file')
precedence = (
('left', 'OR'),
('left', 'AND'),
('left', 'EQ', 'NE'),
('left', 'GT', 'GEQ', 'LT', 'LEQ'),
('left', 'PLUS', 'MINUS'),
)
def parse(self, text):
return self.parser.parse(text)
def p_error(self, p):
print "Syntax error on line %d: %s" % (p.lineno, repr(p.value))
raise SyntaxException(p)
def p_script_file(self, p):
""" script_file : statement_list
"""
p[0] = ast.Script(p[1])
def p_statement_list(self, p):
""" statement_list : statement
| statement_list statement
"""
if len(p) == 2:
p[0] = [p[1]] if p[1] else []
else:
p[0] = p[1] + ([p[2]] if p[2] else [])
def p_statement(self, p):
""" statement : assignment_statement
| loop_statement
| if_statement
| break_statement
| continue_statement
| return_statement
| include_statement
| compound_statement
| named_function_decl
"""
p[0] = p[1]
def p_assignment_statement_1(self, p):
""" assignment_statement : lvalue ASSIGN expression SEMICOLON
"""
p[0] = ast.Assignment(p[1], p[3])
def p_assignment_statement_2(self, p):
""" assignment_statement : lvalue ASSIGN_PLUS expression SEMICOLON
"""
p[0] = ast.PlusAssignment(p[1], p[3])
def p_break_statement(self, p):
""" break_statement : BREAK SEMICOLON
"""
p[0] = ast.Break()
def p_continue_statement(self, p):
""" continue_statement : CONTINUE SEMICOLON
"""
p[0] = ast.Continue()
def p_include_statement(self, p):
""" include_statement : INCLUDE expression SEMICOLON
"""
p[0] = ast.Include(p[2])
def p_return_statement_1(self, p):
""" return_statement : RETURN SEMICOLON
"""
p[0] = ast.Return()
def p_return_statement_2(self, p):
""" return_statement : RETURN expression SEMICOLON
"""
p[0] = ast.Return(p[2])
def p_loop_statement(self, p):
""" loop_statement : for_loop_statement
| do_loop_statement
| while_loop_statement
"""
p[0] = p[1]
def p_for_loop_statement(self, p):
""" for_loop_statement : FOR LPAREN ID IN expression RPAREN compound_statement
"""
p[0] = ast.For(ast.IdentifierLValue(p[3]), p[5], p[7])
def p_do_loop_statement(self, p):
""" do_loop_statement : DO compound_statement WHILE LPAREN expression RPAREN SEMICOLON
"""
p[0] = ast.Do(p[2], p[5])
def p_while_loop_statement(self, p):
""" while_loop_statement : WHILE LPAREN expression RPAREN compound_statement
"""
p[0] = ast.While(p[3], p[5])
def p_compound_statement(self, p):
""" compound_statement : LBRACE statement_list RBRACE
"""
p[0] = p[2]
def p_if_statement_1(self, p):
""" if_statement : IF LPAREN expression RPAREN compound_statement
"""
p[0] = ast.If(p[3], p[5])
def p_if_statement_2(self, p):
""" if_statement : IF LPAREN expression RPAREN compound_statement ELSE compound_statement
"""
p[0] = ast.If(p[3], p[5], p[7])
def p_lvalue_1(self, p):
""" lvalue : ID
"""
p[0] = ast.IdentifierLValue(p[1])
def p_lvalue_2(self, p):
""" lvalue : lvalue DOT ID
"""
p[0] = ast.FieldLValue(p[1])
def p_lvalue_3(self, p):
""" lvalue : lvalue LBRACKET expression RBRACKET
"""
p[0] = ast.IndexedLValue(p[1], p[3])
def p_expression(self, p):
""" expression : binary_expression
"""
p[0] = p[1]
def p_binary_expression_1(self, p):
""" binary_expression : unary_expression
"""
p[0] = p[1]
def p_binary_expression_2(self, p):
""" binary_expression : binary_expression PLUS binary_expression
"""
p[0] = ast.Plus(p[1], p[3])
def p_binary_expression_3(self, p):
""" binary_expression : binary_expression MINUS binary_expression
"""
p[0] = ast.Minus(p[1], p[3])
def p_binary_expression_4(self, p):
""" binary_expression : binary_expression OR binary_expression
"""
p[0] = ast.Or(p[1], p[3])
def p_binary_expression_5(self, p):
""" binary_expression : binary_expression AND binary_expression
"""
p[0] = ast.And(p[1], p[3])
def p_binary_expression_6(self, p):
""" binary_expression : binary_expression LT binary_expression
"""
p[0] = ast.LessThan(p[1], p[3])
def p_binary_expression_7(self, p):
""" binary_expression : binary_expression GT binary_expression
"""
p[0] = ast.GreaterThan(p[1], p[3])
def p_binary_expression_8(self, p):
""" binary_expression : binary_expression LEQ binary_expression
"""
p[0] = ast.LessThanOrEqual(p[1], p[3])
def p_binary_expression_9(self, p):
""" binary_expression : binary_expression GEQ binary_expression
"""
p[0] = ast.GreaterThanOrEqual(p[1], p[3])
def p_binary_expression_10(self, p):
""" binary_expression : binary_expression EQ binary_expression
"""
p[0] = ast.Equal(p[1], p[3])
def p_binary_expression_11(self, p):
""" binary_expression : binary_expression NE binary_expression
"""
p[0] = ast.NotEqual(p[1], p[3])
def p_unary_expression_1(self, p):
""" unary_expression : postfix_expression
"""
p[0] = p[1]
def p_unary_expression_2(self, p):
""" unary_expression : STAR unary_expression
"""
p[0] = ast.Dereference(p[2])
def p_unary_expression_3(self, p):
""" unary_expression : NOT binary_expression
"""
p[0] = ast.Not(p[2])
def p_unary_expression_4(self, p):
""" unary_expression : MINUS binary_expression
"""
p[0] = ast.UnaryMinus(p[2])
def p_postfix_expression_1(self, p):
""" postfix_expression : primary_expression
"""
p[0] = p[1]
def p_postfix_expression_2(self, p):
""" postfix_expression : postfix_expression LBRACKET expression RBRACKET
"""
p[0] = ast.ListIndex(p[1], p[3])
def p_postfix_expression_3(self, p):
""" postfix_expression : postfix_expression LPAREN expression_list RPAREN
"""
p[0] = ast.FunctionCall(p[1], p[3])
def p_postfix_expression_4(self, p):
""" postfix_expression : postfix_expression LPAREN RPAREN
"""
p[0] = ast.FunctionCall(p[1])
def p_postfix_expression_5(self, p):
""" postfix_expression : postfix_expression DOT identifier_name
"""
p[0] = ast.FieldReference(p[1], p[3])
def p_primary_expression_1(self, p):
""" primary_expression : identifier_name
| list_expression
| constant
| function_decl_expression
| lambda_expression
| dict_expression
"""
p[0] = p[1]
def p_primary_expression_2(self, p):
""" primary_expression : LPAREN expression RPAREN
"""
p[0] = p[2]
def p_constant_1(self, p):
""" constant : INT_LITERAL
| string_literal
"""
p[0] = ast.Constant(p[1])
def p_constant_2(self, p):
""" constant : boolean_literal
"""
p[0] = p[1]
def p_string_literal(self, p):
""" string_literal : QUOTATION_MARK string_chars QUOTATION_MARK
"""
p[0] = p[2]
def p_string_chars(self, p):
""" string_chars :
| string_chars string_char
"""
if len(p) == 1:
p[0] = unicode()
else:
p[0] = p[1] + p[2]
def p_string_char_1(self, p):
""" string_char : UNESCAPED
"""
p[0] = p[1]
def p_string_char_2(self, p):
""" string_char : ESCAPE QUOTATION_MARK
| ESCAPE BACKSLASH
| ESCAPE BACKSPACE_CHAR
| ESCAPE FORM_FEED_CHAR
| ESCAPE LINE_FEED_CHAR
| ESCAPE CARRIAGE_RETURN_CHAR
| ESCAPE TAB_CHAR
"""
p[0] = p[2]
def p_string_char_3(self, p):
""" string_char : ESCAPE UNICODE_HEX
"""
p[0] = unichr(int(p[2][1:], 16))
def p_boolean_literal_1(self, p):
""" boolean_literal : TRUE
"""
p[0] = ast.Constant(True)
def p_boolean_literal_2(self, p):
""" boolean_literal : FALSE
"""
p[0] = ast.Constant(False)
def p_list_expression_1(self, p):
""" list_expression : LBRACKET RBRACKET
"""
p[0] = ast.List()
def p_list_expression_2(self, p):
""" list_expression : LBRACKET expression_list RBRACKET
"""
p[0] = ast.List(p[2])
def p_function_decl_expression_1(self, p):
""" function_decl_expression : FUNC LPAREN identifier_list RPAREN compound_statement
"""
p[0] = ast.FunctionDeclaration(p[3], p[5])
def p_function_decl_expression_2(self, p):
""" function_decl_expression : FUNC LPAREN RPAREN compound_statement
"""
p[0] = ast.FunctionDeclaration([], p[4])
def p_named_function_decl_1(self, p):
""" named_function_decl : FUNC ID LPAREN identifier_list RPAREN compound_statement
"""
p[0] = ast.NamedFunctionDeclaration(ast.Identifier(p[2]), p[4], p[6])
def p_named_function_decl_2(self, p):
""" named_function_decl : FUNC ID LPAREN RPAREN compound_statement
"""
p[0] = ast.NamedFunctionDeclaration(ast.Identifier(p[2]), [], p[5])
def p_lambda_expression_1(self, p):
""" lambda_expression : LAMBDA identifier_list COLON expression
"""
p[0] = ast.LambdaExpression(p[4], p[2])
def p_lambda_expression_2(self, p):
""" lambda_expression : LAMBDA COLON expression
"""
p[0] = ast.LambdaExpression(p[3])
def p_dict_expression_1(self, p):
""" dict_expression : LBRACE RBRACE
"""
p[0] = ast.Dict()
def p_dict_expression_2(self, p):
""" dict_expression : LBRACE key_value_list RBRACE
"""
p[0] = ast.Dict(p[2])
def p_key_value_list_1(self, p):
""" key_value_list : expression COLON expression
"""
p[0] = [ast.KeyValuePair(p[1], p[3])]
def p_key_value_list_2(self, p):
""" key_value_list : key_value_list COMMA expression COLON expression
"""
p[0] = p[1] + [ast.KeyValuePair(p[3], p[5])]
def p_expression_list(self, p):
""" expression_list : expression
| expression_list COMMA expression
"""
if len(p) == 2:
p[0] = [p[1]] if p[1] else []
else:
p[0] = p[1] + ([p[3]] if p[3] else [])
def p_identifier_list(self, p):
""" identifier_list : ID
| identifier_list COMMA ID
"""
if len(p) == 2:
p[0] = [p[1]] if p[1] else []
else:
p[0] = p[1] + ([p[3]] if p[3] else [])
def p_identifier_name(self, p):
""" identifier_name : ID
"""
p[0] = ast.Identifier(p[1])
