2024-04-26 13:36:20 +03:00
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#!/usr/bin/env python3
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import lexer
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import ply.lex as lex
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import ply.yacc as yacc
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tokens = lexer.tokens
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class ASTnode:
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def __init__(self, typestr, lineno, value = None):
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self.type = None
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self.nodetype = typestr
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self.lineno = lineno
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if value is not None:
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self.value = value
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def p_program1(p):
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'program : statement_list'
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p[0] = ASTnode('program', p.lineno(1))
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p[0].children_definitions = []
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p[0].children_statements = p[1].children_statements
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def p_program2(p):
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'program : definition_list statement_list'
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p[0] = ASTnode('program', p.lineno(1))
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p[0].children_definitions = p[1].children_definitions
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p[0].children_statements = p[2].children_statements
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def p_statement_list1(p):
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'statement_list : statement'
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p[0] = ASTnode('statement_list', p.lineno(1))
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p[0].children_statements = [ p[1] ]
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def p_statement_list2(p):
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'statement_list : statement_list COMMA statement'
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p[0] = p[1]
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p[0].children_statements += [ p[3] ]
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def p_definition_list1(p):
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'definition_list : definition'
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p[0] = ASTnode('definition_list', p.lineno(1))
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p[0].children_definitions = [ p[1] ]
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def p_definition_list2(p):
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'definition_list : definition_list definition'
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p[0] = p[1]
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p[0].children_definitions += [ p[2] ]
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def p_definition(p):
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'''definition : function_definition
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| procedure_definition
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| variable_definition'''
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p[0] = p[1]
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def p_variable_definition(p):
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'variable_definition : VAR IDENT EQ expression'
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p[0] = ASTnode('variable_definition', p.lineno(1), p[2])
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p[0].child_expression = p[4]
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def p_empty(p):
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'empty :'
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pass
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def p_variable_definition_list1(p):
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'variable_definition_list : empty'
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p[0] = ASTnode('variable_definition_list', p.lineno(1))
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p[0].children_definitions = []
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def p_variable_definition_list2(p):
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'variable_definition_list : variable_definition_list variable_definition'
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p[0] = p[1]
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p[0].children_definitions += [ p[2] ]
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def p_function_definition(p):
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'''function_definition : FUNCTION FUNC_IDENT LCURLY formal_list RCURLY RETURN IDENT variable_definition_list IS rvalue END FUNCTION'''
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p[0] = ASTnode('function_definition', p.lineno(2), p[2])
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p[0].children_formals = p[4].children_formals
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p[0].child_return_type = p[7]
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p[0].children_variable_definitions = p[8].children_definitions
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p[0].child_expression = p[10]
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def p_procedure_definition1(p):
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'procedure_definition : PROCEDURE PROC_IDENT LCURLY formal_list RCURLY variable_definition_list IS statement_list END PROCEDURE'
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p[0] = ASTnode('procedure_definition', p.lineno(2), p[2])
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p[0].children_formals = p[4].children_formals
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p[0].children_variable_definitions = p[6].children_definitions
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p[0].children_statements = p[8].children_statements
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p[0].child_return_type = None
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def p_procedure_definition2(p):
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'''procedure_definition : PROCEDURE PROC_IDENT LCURLY formal_list RCURLY RETURN IDENT variable_definition_list IS statement_list END PROCEDURE'''
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p[0] = ASTnode('procedure_definition', p.lineno(2), p[2])
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p[0].children_formals = p[4].children_formals
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p[0].children_variable_definitions = p[8].children_definitions
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p[0].children_statements = p[10].children_statements
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p[0].child_return_type = p[7]
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def p_formal_list1(p):
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'formal_list : empty'
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p[0] = ASTnode('formal_list', p.lineno(1))
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p[0].children_formals = []
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def p_formal_list2(p):
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'formal_list : formal_arg'
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p[0] = ASTnode('formal_list', p.lineno(1))
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p[0].children_formals = [ p[1] ]
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def p_formal_list3(p):
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'formal_list : formal_list COMMA formal_arg'
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p[0] = p[1]
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p[0].children_formals += [ p[3] ]
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def p_formal_arg(p):
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'formal_arg : IDENT LSQUARE IDENT RSQUARE'
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p[0] = ASTnode('formal_argument', p.lineno(1), p[1])
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p[0].type = p[3]
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def p_procedure_call1(p):
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'procedure_call : PROC_IDENT LPAREN RPAREN'
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p[0] = ASTnode('procedure_call', p.lineno(1), p[1])
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p[0].children_arguments = []
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def p_procedure_call(p):
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'''procedure_call : PROC_IDENT LPAREN arguments RPAREN'''
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p[0] = ASTnode('procedure_call', p.lineno(1), p[1])
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p[0].children_arguments = p[3].children_arguments
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def p_arguments1(p):
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'arguments : expression'
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p[0] = ASTnode('arguments', p.lineno(1))
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p[0].children_arguments = [ p[1] ]
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def p_arguments2(p):
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'arguments : arguments COMMA expression'
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p[0] = p[1]
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p[0].children_arguments += [ p[3] ]
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def p_assignment(p):
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'assignment : lvalue EQ rvalue'
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p[0] = ASTnode('assignment', p.lineno(2))
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p[0].child_lhs = p[1]
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p[0].child_rhs = p[3]
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def p_lvalue1(p):
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'lvalue : IDENT'
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p[0] = ASTnode('identifier', p.lineno(1), p[1])
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def p_lvalue2(p):
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'lvalue : IDENT DOT IDENT'
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p[0] = ASTnode('attribute_write', p.lineno(1))
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p[0].child_identifier = ASTnode('identifier', p.lineno(1), p[1])
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p[0].child_attribute = ASTnode('identifier', p.lineno(3), p[3])
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def p_rvalue(p):
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'''rvalue : expression
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| unless_expression'''
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p[0] = p[1]
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def p_print_statement1(p):
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'print_statement : PRINT print_item'
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p[0] = ASTnode('print', p.lineno(1))
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p[0].children_items = [ p[2] ]
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def p_print_statement2(p):
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'print_statement : print_statement AMPERSAND print_item'
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p[0] = p[1]
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p[0].children_items += [ p[3] ]
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def p_print_item1(p):
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'print_item : STRING'
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p[0] = ASTnode('string_literal', p.lineno(1), p[1])
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def p_print_item2(p):
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'print_item : expression'
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p[0] = p[1]
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def p_statement1(p):
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'''statement : procedure_call
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| assignment
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| print_statement'''
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p[0] = p[1]
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def p_statement2(p):
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'statement : DO statement_list UNTIL expression'
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p[0] = ASTnode('do_until', p.lineno(1))
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p[0].children_statements = p[2].children_statements
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p[0].child_condition = p[4]
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def p_statement3(p):
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'statement : DO statement_list UNLESS expression DONE'
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p[0] = ASTnode('do_unless', p.lineno(1))
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p[0].children_statements_false = p[2].children_statements
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p[0].child_condition = p[4]
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p[0].children_statements_true = []
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def p_statement4(p):
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'statement : DO statement_list UNLESS expression OTHERWISE statement_list DONE'
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p[0] = ASTnode('do_unless', p.lineno(1))
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p[0].children_statements_false = p[2].children_statements
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p[0].child_condition = p[4]
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p[0].children_statements_true = p[6].children_statements
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def p_statement5(p):
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'statement : RETURN expression'
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p[0] = ASTnode('return', p.lineno(1))
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p[0].child_expression = p[2]
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def p_expression1(p):
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'expression : simple_expr'
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p[0] = p[1]
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def p_expression2(p):
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'''expression : expression EQ simple_expr
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| expression LT simple_expr'''
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p[0] = ASTnode('binary_op', p.lineno(2), p[2])
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p[0].child_lhs = p[1]
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p[0].child_rhs = p[3]
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def p_simple_expr1(p):
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'simple_expr : term'
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p[0] = p[1]
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def p_simple_expr2(p):
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'''simple_expr : simple_expr PLUS term
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| simple_expr MINUS term'''
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p[0] = ASTnode('binary_op', p.lineno(2), p[2])
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p[0].child_lhs = p[1]
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p[0].child_rhs = p[3]
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def p_term1(p):
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'term : factor'
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p[0] = p[1]
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def p_term2(p):
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'''term : term MULT factor
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| term DIV factor'''
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p[0] = ASTnode('binary_op', p.lineno(2), p[2])
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p[0].child_lhs = p[1]
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p[0].child_rhs = p[3]
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def p_factor1(p):
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'factor : atom'
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p[0] = p[1]
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def p_factor2(p):
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'''factor : MINUS atom
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| PLUS atom'''
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p[0] = ASTnode('unary_op', p.lineno(1), p[1])
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p[0].child_atom = p[2]
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def p_atom1(p):
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'atom : IDENT'
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p[0] = ASTnode('identifier', p.lineno(1), p[1])
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def p_atom2(p):
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'atom : INT_LITERAL'
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p[0] = ASTnode('int_literal', p.lineno(1), p[1])
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def p_atom3(p):
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'atom : DATE_LITERAL'
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p[0] = ASTnode('date_literal', p.lineno(1), p[1])
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def p_atom4(p):
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'atom : IDENT APOSTROPHE IDENT'
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p[0] = ASTnode('attribute_read', p.lineno(1))
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p[0].child_identifier = ASTnode('identifier', p.lineno(1), p[1])
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p[0].child_attribute = ASTnode('identifier', p.lineno(3), p[3])
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def p_atom5(p):
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'atom : LPAREN expression RPAREN'
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p[0] = p[2]
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def p_atom6(p):
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'''atom : function_call
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| procedure_call'''
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p[0] = p[1]
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def p_function_call1(p):
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'function_call : FUNC_IDENT LPAREN RPAREN'
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p[0] = ASTnode('function_call', p.lineno(1), p[1])
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p[0].children_arguments = []
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def p_function_call2(p):
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'function_call : FUNC_IDENT LPAREN arguments RPAREN'
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p[0] = ASTnode('function_call', p.lineno(1), p[1])
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p[0].children_arguments = p[3].children_arguments
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def p_unless_expression(p):
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'unless_expression : DO expression UNLESS expression OTHERWISE expression DONE'
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p[0] = ASTnode('unless_expression', p.lineno(1))
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p[0].child_condition = p[4]
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2024-04-28 01:35:48 +03:00
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p[0].child_expression_true = p[6]
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p[0].child_expression_false = p[2]
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2024-04-26 13:36:20 +03:00
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def p_error(p):
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if p is not None:
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print(f"{{{p.lexer.lineno}}}:Syntax Error (token:'{p.value}')")
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else:
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print('Syntax Error at the end of file')
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raise SystemExit
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def syntax_check_file(file_path: str, debug: bool) -> ASTnode:
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parser = yacc.yacc()
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with open(file_path, 'r', encoding='utf-8') as file:
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result = parser.parse(file.read(), lexer=lexer.lexer, debug=debug)
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return result
|
