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 CSymbolExpression = collections.namedtuple(
  20     'CSymbolExpression',
  21     [
  22         'symbol',
  23         'symbol_list_index',
  24     ],
  25 )
  26
  27 CNegationExpression = collections.namedtuple(
  28     'CNegationExpression',
  29     [
  30         'value',
  31     ],
  32 )
  33
  34 CAdditionExpression = collections.namedtuple(
  35     'CAdditionExpression',
  36     [
  37         'left',
  38         'right',
  39     ],
  40 )
  41
  42 CSubtractionExpression = collections.namedtuple(
  43     'CSubtractionExpression',
  44     [
  45         'left',
  46         'right',
  47     ],
  48 )
  49
  50 CMultiplicationExpression = collections.namedtuple(
  51     'CMultiplicationExpression',
  52     [
  53         'left',
  54         'right',
  55     ],
  56 )
  57
  58 CIntegerDivisionExpression = collections.namedtuple(
  59     'CIntegerDivisionExpression',
  60     [
  61         'left',
  62         'right',
  63     ],
  64 )
  65
  66 CModularDivisionExpression = collections.namedtuple(
  67     'CModularDivisionExpression',
  68     [
  69         'left',
  70         'right',
  71     ],
  72 )
  73
  74 CFunctionCallExpression = collections.namedtuple(
  75     'CFunctionCallExpression',
  76     [
  77         'name',
  78         'arguments',
  79     ],
  80 )
  81
  82 CAssignmentStatement = collections.namedtuple(
  83     'CAssignmentStatement',
  84     [
  85         'target',
  86         'target_symbol_list_index',
  87         'expression',
  88     ],
  89 )
  90
  91 CProgram = collections.namedtuple(
  92     'CProgram',
  93     [
  94         'builtins',
  95         'statements',
  96         'standard_libraries',
  97         'symbol_list',
  98     ],
  99 )
 100
 101 BUILTINS = {
 102     'pow':      ['math.h'],
 103     'print':    ['stdio.h'],
 104 }
 105
 106 def transform_expression(builtin_dependencies, symbol_list, expression):
 107     if isinstance(expression, parsing.FurNegationExpression):
 108         return transform_negation_expression(builtin_dependencies, symbol_list, expression)
 109
 110     if isinstance(expression, parsing.FurFunctionCallExpression):
 111         return transform_function_call_expression(builtin_dependencies, symbol_list, expression)
 112
 113     if isinstance(expression, parsing.FurSymbolExpression):
 114         if expression.value not in symbol_list:
 115             symbol_list.append(expression.value)
 116
 117         return CSymbolExpression(
 118             symbol=expression.value,
 119             symbol_list_index=symbol_list.index(expression.value),
 120         )
 121
 122     LITERAL_TYPE_MAPPING = {
 123         parsing.FurIntegerLiteralExpression: CIntegerLiteral,
 124         parsing.FurStringLiteralExpression: CStringLiteral,
 125     }
 126
 127     if type(expression) in LITERAL_TYPE_MAPPING:
 128         return LITERAL_TYPE_MAPPING[type(expression)](value=expression.value)
 129
 130     INFIX_TYPE_MAPPING = {
 131         parsing.FurAdditionExpression: CAdditionExpression,
 132         parsing.FurSubtractionExpression: CSubtractionExpression,
 133         parsing.FurMultiplicationExpression: CMultiplicationExpression,
 134         parsing.FurIntegerDivisionExpression: CIntegerDivisionExpression,
 135         parsing.FurModularDivisionExpression: CModularDivisionExpression,
 136     }
 137
 138     return INFIX_TYPE_MAPPING[type(expression)](
 139         left=transform_expression(builtin_dependencies, symbol_list, expression.left),
 140         right=transform_expression(builtin_dependencies, symbol_list, expression.right),
 141     )
 142
 143 def transform_assignment_statement(builtin_dependencies, symbol_list, assignment_statement):
 144     # TODO Check that target is not a builtin
 145     if assignment_statement.target not in symbol_list:
 146         symbol_list.append(assignment_statement.target)
 147
 148     return CAssignmentStatement(
 149         target=assignment_statement.target,
 150         target_symbol_list_index=symbol_list.index(assignment_statement.target),
 151         expression=transform_expression(
 152             builtin_dependencies,
 153             symbol_list,
 154             assignment_statement.expression,
 155         ),
 156     )
 157
 158 def transform_negation_expression(builtin_dependencies, symbol_list, negation_expression):
 159     return CNegationExpression(
 160         value=transform_expression(builtin_dependencies, symbol_list, negation_expression.value),
 161     )
 162
 163 def transform_function_call_expression(builtin_dependencies, symbol_list, function_call):
 164     if function_call.function.value in BUILTINS.keys():
 165         builtin_dependencies.add(function_call.function.value)
 166
 167         return CFunctionCallExpression(
 168             name='builtin$' + function_call.function.value,
 169             arguments=tuple(
 170                 transform_expression(builtin_dependencies, symbol_list, arg)
 171                 for arg in function_call.arguments
 172             ),
 173         )
 174
 175     raise Exception()
 176
 177 def transform_statement(builtin_dependencies, symbol_list, statement):
 178     return {
 179         parsing.FurAssignmentStatement: transform_assignment_statement,
 180         parsing.FurFunctionCallExpression: transform_function_call_expression,
 181     }[type(statement)](builtin_dependencies, symbol_list, statement)
 182
 183 def transform(program):
 184     builtins = set()
 185     symbol_list = []
 186
 187     c_statements = [
 188         transform_statement(builtins, symbol_list, statement) for statement in program.statement_list
 189     ]
 190
 191     standard_libraries = set()
 192     for builtin in builtins:
 193         for standard_library in BUILTINS[builtin]:
 194             standard_libraries.add(standard_library)
 195
 196     return CProgram(
 197         builtins=builtins,
 198         statements=c_statements,
 199         standard_libraries=standard_libraries,
 200         symbol_list=symbol_list,
 201     )
 202
 203
 204 if __name__ == '__main__':
 205     import unittest
 206
 207     unittest.main()