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

   1 import collections
   2
   3 import parsing
   4
   5 CIntegerLiteral = collections.namedtuple(
   6     'CIntegerLiteral',
   7     [
   8         'value',
   9     ],
  10 )
  11
  12 CStringLiteral = collections.namedtuple(
  13     'CStringLiteral',
  14     [
  15         'value',
  16     ],
  17 )
  18
  19 CNegationExpression = collections.namedtuple(
  20     'CNegationExpression',
  21     [
  22         'value',
  23     ],
  24 )
  25
  26 CAdditionExpression = collections.namedtuple(
  27     'CAdditionExpression',
  28     [
  29         'left',
  30         'right',
  31     ],
  32 )
  33
  34 CSubtractionExpression = collections.namedtuple(
  35     'CSubtractionExpression',
  36     [
  37         'left',
  38         'right',
  39     ],
  40 )
  41
  42 CMultiplicationExpression = collections.namedtuple(
  43     'CMultiplicationExpression',
  44     [
  45         'left',
  46         'right',
  47     ],
  48 )
  49
  50 CIntegerDivisionExpression = collections.namedtuple(
  51     'CIntegerDivisionExpression',
  52     [
  53         'left',
  54         'right',
  55     ],
  56 )
  57
  58 CModularDivisionExpression = collections.namedtuple(
  59     'CModularDivisionExpression',
  60     [
  61         'left',
  62         'right',
  63     ],
  64 )
  65
  66 CFunctionCallExpression = collections.namedtuple(
  67     'CFunctionCallExpression',
  68     [
  69         'name',
  70         'arguments',
  71     ],
  72 )
  73
  74 CProgram = collections.namedtuple(
  75     'CProgram',
  76     [
  77         'builtins',
  78         'statements',
  79         'standard_libraries',
  80     ],
  81 )
  82
  83 BUILTINS = {
  84     'pow':      ['math.h'],
  85     'print':    ['stdio.h'],
  86 }
  87
  88 def transform_expression(builtin_dependencies, expression):
  89     if isinstance(expression, parsing.FurNegationExpression):
  90         return transform_negation_expression(builtin_dependencies, expression)
  91
  92     if isinstance(expression, parsing.FurFunctionCallExpression):
  93         return transform_function_call_expression(builtin_dependencies, expression)
  94
  95     LITERAL_TYPE_MAPPING = {
  96         parsing.FurIntegerLiteralExpression: CIntegerLiteral,
  97         parsing.FurStringLiteralExpression: CStringLiteral,
  98     }
  99
 100     if type(expression) in LITERAL_TYPE_MAPPING:
 101         return LITERAL_TYPE_MAPPING[type(expression)](value=expression.value)
 102
 103     INFIX_TYPE_MAPPING = {
 104         parsing.FurAdditionExpression: CAdditionExpression,
 105         parsing.FurSubtractionExpression: CSubtractionExpression,
 106         parsing.FurMultiplicationExpression: CMultiplicationExpression,
 107         parsing.FurIntegerDivisionExpression: CIntegerDivisionExpression,
 108         parsing.FurModularDivisionExpression: CModularDivisionExpression,
 109     }
 110
 111     return INFIX_TYPE_MAPPING[type(expression)](
 112         left=transform_expression(builtin_dependencies, expression.left),
 113         right=transform_expression(builtin_dependencies, expression.right),
 114     )
 115
 116 def transform_negation_expression(builtin_dependencies, negation_expression):
 117     return CNegationExpression(value=transform_expression(builtin_dependencies, negation_expression.value))
 118
 119 def transform_function_call_expression(builtin_dependencies, function_call):
 120     if function_call.name in BUILTINS.keys():
 121         builtin_dependencies.add(function_call.name)
 122
 123         return CFunctionCallExpression(
 124             name='builtin$' + function_call.name,
 125             arguments=tuple(transform_expression(builtin_dependencies, arg) for arg in function_call.arguments),
 126         )
 127
 128     raise Exception()
 129
 130 def transform(program):
 131     builtins = set()
 132
 133     c_statements = [
 134         transform_function_call_expression(builtins, statement) for statement in program.statement_list
 135     ]
 136
 137     standard_libraries = set()
 138     for builtin in builtins:
 139         for standard_library in BUILTINS[builtin]:
 140             standard_libraries.add(standard_library)
 141
 142     return CProgram(
 143         builtins=builtins,
 144         statements=c_statements,
 145         standard_libraries=standard_libraries,
 146     )
 147
 148
 149 if __name__ == '__main__':
 150     import unittest
 151
 152     unittest.main()