code.kerkeslager.com Git - fur/blob - generation.py

   1 import jinja2
   2
   3 import transformation
   4
   5 ENV = jinja2.Environment(
   6     autoescape=jinja2.select_autoescape([]),
   7     loader=jinja2.FileSystemLoader('templates'),
   8     trim_blocks=True,
   9 )
  10
  11 def generate_integer_literal(c_integer_literal):
  12     return 'integerLiteral({})'.format(c_integer_literal.value)
  13
  14 def generate_string_literal(c_string_literal):
  15     def c_escape(ch):
  16         return {
  17             '\n': r'\n',
  18             '"': r'\"',
  19             '\\': r'\\',
  20         }.get(ch, ch)
  21
  22     return 'stringLiteral(runtime, "{}")'.format(
  23         ''.join(c_escape(ch for ch in c_string_literal.value)),
  24     )
  25
  26 def generate_symbol_expression(c_symbol_expression):
  27     return 'Environment_get(environment, SYMBOL_LIST[{}] /* symbol: {} */)'.format(
  28         c_symbol_expression.symbol_list_index,
  29         c_symbol_expression.symbol,
  30     )
  31
  32 def generate_expression(c_argument):
  33     if isinstance(c_argument, transformation.CNegationExpression):
  34         return generate_negation_expression(c_argument)
  35
  36     if isinstance(c_argument, transformation.CFunctionCallExpression):
  37         return generate_function_call(c_argument)
  38
  39     LITERAL_TYPE_MAPPING = {
  40         transformation.CIntegerLiteral: generate_integer_literal,
  41         transformation.CStringLiteral: generate_string_literal,
  42         transformation.CSymbolExpression: generate_symbol_expression,
  43     }
  44
  45     if type(c_argument) in LITERAL_TYPE_MAPPING:
  46         return LITERAL_TYPE_MAPPING[type(c_argument)](c_argument)
  47
  48     INFIX_TYPE_MAPPING = {
  49         transformation.CAdditionExpression: 'add',
  50         transformation.CSubtractionExpression: 'subtract',
  51         transformation.CMultiplicationExpression: 'multiply',
  52         transformation.CIntegerDivisionExpression: 'integerDivide',
  53         transformation.CModularDivisionExpression: 'modularDivide',
  54     }
  55
  56     return 'builtin${}({}, {})'.format(
  57         INFIX_TYPE_MAPPING[type(c_argument)],
  58         generate_expression(c_argument.left),
  59         generate_expression(c_argument.right),
  60     )
  61
  62 def generate_negation_expression(c_negation_expression):
  63     return 'builtin$negate({})'.format(
  64         generate_expression(c_negation_expression.value)
  65     )
  66
  67 def generate_function_call(c_function_call):
  68     return '{}({})'.format(
  69         c_function_call.name,
  70         ', '.join(generate_expression(argument) for argument in c_function_call.arguments),
  71     )
  72
  73 def generate_expression_statement(c_function_call_statement):
  74     # TODO Do we need to garbage collect the results of arbitrary statements?
  75     return '{};'.format(generate_expression(c_function_call_statement))
  76
  77 def generate_assignment_statement(c_assignment_statement):
  78     return 'Environment_set(environment, SYMBOL_LIST[{}] /* symbol: {} */, {});'.format(
  79         c_assignment_statement.target_symbol_list_index,
  80         c_assignment_statement.target,
  81         generate_expression(c_assignment_statement.expression),
  82     )
  83
  84 def generate_statement(statement):
  85     if isinstance(statement, transformation.CAssignmentStatement):
  86         return generate_assignment_statement(statement)
  87
  88     return generate_expression_statement(statement)
  89
  90 def generate(c_program):
  91     template = ENV.get_template('program.c')
  92     return template.render(
  93         builtins=list(sorted(c_program.builtins)),
  94         statements=[generate_statement(statement) for statement in c_program.statements],
  95         standard_libraries=list(sorted(c_program.standard_libraries)),
  96         symbol_list=c_program.symbol_list,
  97     )
  98
  99 if __name__ == '__main__':
 100     import unittest
 101
 102     unittest.main()