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_expression(c_argument):
  27     if isinstance(c_argument, transformation.CNegationExpression):
  28         return generate_negation_expression(c_argument)
  29
  30     if isinstance(c_argument, transformation.CFunctionCallExpression):
  31         return generate_function_call(c_argument)
  32
  33     LITERAL_TYPE_MAPPING = {
  34         transformation.CIntegerLiteral: generate_integer_literal,
  35         transformation.CStringLiteral: generate_string_literal,
  36     }
  37
  38     if type(c_argument) in LITERAL_TYPE_MAPPING:
  39         return LITERAL_TYPE_MAPPING[type(c_argument)](c_argument)
  40
  41     INFIX_TYPE_MAPPING = {
  42         transformation.CAdditionExpression: 'add',
  43         transformation.CSubtractionExpression: 'subtract',
  44         transformation.CMultiplicationExpression: 'multiply',
  45         transformation.CIntegerDivisionExpression: 'integerDivide',
  46         transformation.CModularDivisionExpression: 'modularDivide',
  47     }
  48
  49     return 'builtin${}({}, {})'.format(
  50         INFIX_TYPE_MAPPING[type(c_argument)],
  51         generate_expression(c_argument.left),
  52         generate_expression(c_argument.right),
  53     )
  54
  55 def generate_negation_expression(c_negation_expression):
  56     return 'builtin$negate({})'.format(
  57         generate_expression(c_negation_expression.value)
  58     )
  59
  60 def generate_function_call(c_function_call):
  61     return '{}({})'.format(
  62         c_function_call.name,
  63         ', '.join(generate_expression(argument) for argument in c_function_call.arguments),
  64     )
  65
  66 def generate_statement(c_function_call_statement):
  67     return '{};'.format(generate_function_call(c_function_call_statement))
  68
  69 def generate(c_program):
  70     template = ENV.get_template('program.c')
  71     return template.render(
  72         builtins=list(sorted(c_program.builtins)),
  73         statements=[generate_statement(statement) for statement in c_program.statements],
  74         standard_libraries=list(sorted(c_program.standard_libraries)),
  75     )
  76
  77 if __name__ == '__main__':
  78     import unittest
  79
  80     unittest.main()