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 CConstantExpression = collections.namedtuple(
  20     'CConstantExpression',
  21     [
  22         'value'
  23     ],
  24 )
  25
  26 CSymbolExpression = collections.namedtuple(
  27     'CSymbolExpression',
  28     [
  29         'symbol',
  30         'symbol_list_index',
  31     ],
  32 )
  33
  34 CNegationExpression = collections.namedtuple(
  35     'CNegationExpression',
  36     [
  37         'value',
  38     ],
  39 )
  40
  41 CAdditionExpression = collections.namedtuple(
  42     'CAdditionExpression',
  43     [
  44         'left',
  45         'right',
  46     ],
  47 )
  48
  49 CSubtractionExpression = collections.namedtuple(
  50     'CSubtractionExpression',
  51     [
  52         'left',
  53         'right',
  54     ],
  55 )
  56
  57 CMultiplicationExpression = collections.namedtuple(
  58     'CMultiplicationExpression',
  59     [
  60         'left',
  61         'right',
  62     ],
  63 )
  64
  65 CIntegerDivisionExpression = collections.namedtuple(
  66     'CIntegerDivisionExpression',
  67     [
  68         'left',
  69         'right',
  70     ],
  71 )
  72
  73 CModularDivisionExpression = collections.namedtuple(
  74     'CModularDivisionExpression',
  75     [
  76         'left',
  77         'right',
  78     ],
  79 )
  80
  81 CFunctionCallExpression = collections.namedtuple(
  82     'CFunctionCallExpression',
  83     [
  84         'name',
  85         'arguments',
  86     ],
  87 )
  88
  89 CAssignmentStatement = collections.namedtuple(
  90     'CAssignmentStatement',
  91     [
  92         'target',
  93         'target_symbol_list_index',
  94         'expression',
  95     ],
  96 )
  97
  98 CProgram = collections.namedtuple(
  99     'CProgram',
 100     [
 101         'builtins',
 102         'statements',
 103         'standard_libraries',
 104         'symbol_list',
 105     ],
 106 )
 107
 108 BUILTINS = {
 109     'false':    [],
 110     'pow':      ['math.h'],
 111     'print':    ['stdio.h'],
 112     'true':     [],
 113 }
 114
 115 def transform_expression(builtin_dependencies, symbol_list, expression):
 116     if isinstance(expression, parsing.FurNegationExpression):
 117         return transform_negation_expression(builtin_dependencies, symbol_list, expression)
 118
 119     if isinstance(expression, parsing.FurFunctionCallExpression):
 120         return transform_function_call_expression(builtin_dependencies, symbol_list, expression)
 121
 122     if isinstance(expression, parsing.FurSymbolExpression):
 123         if expression.value in ['true', 'false']:
 124             return CConstantExpression(value=expression.value)
 125
 126         if expression.value not in symbol_list:
 127             symbol_list.append(expression.value)
 128
 129         return CSymbolExpression(
 130             symbol=expression.value,
 131             symbol_list_index=symbol_list.index(expression.value),
 132         )
 133
 134     LITERAL_TYPE_MAPPING = {
 135         parsing.FurIntegerLiteralExpression: CIntegerLiteral,
 136         parsing.FurStringLiteralExpression: CStringLiteral,
 137     }
 138
 139     if type(expression) in LITERAL_TYPE_MAPPING:
 140         return LITERAL_TYPE_MAPPING[type(expression)](value=expression.value)
 141
 142     INFIX_TYPE_MAPPING = {
 143         parsing.FurAdditionExpression: CAdditionExpression,
 144         parsing.FurSubtractionExpression: CSubtractionExpression,
 145         parsing.FurMultiplicationExpression: CMultiplicationExpression,
 146         parsing.FurIntegerDivisionExpression: CIntegerDivisionExpression,
 147         parsing.FurModularDivisionExpression: CModularDivisionExpression,
 148     }
 149
 150     return INFIX_TYPE_MAPPING[type(expression)](
 151         left=transform_expression(builtin_dependencies, symbol_list, expression.left),
 152         right=transform_expression(builtin_dependencies, symbol_list, expression.right),
 153     )
 154
 155 def transform_assignment_statement(builtin_dependencies, symbol_list, assignment_statement):
 156     # TODO Check that target is not a builtin
 157     if assignment_statement.target not in symbol_list:
 158         symbol_list.append(assignment_statement.target)
 159
 160     return CAssignmentStatement(
 161         target=assignment_statement.target,
 162         target_symbol_list_index=symbol_list.index(assignment_statement.target),
 163         expression=transform_expression(
 164             builtin_dependencies,
 165             symbol_list,
 166             assignment_statement.expression,
 167         ),
 168     )
 169
 170 def transform_negation_expression(builtin_dependencies, symbol_list, negation_expression):
 171     return CNegationExpression(
 172         value=transform_expression(builtin_dependencies, symbol_list, negation_expression.value),
 173     )
 174
 175 def transform_function_call_expression(builtin_dependencies, symbol_list, function_call):
 176     if function_call.function.value in BUILTINS.keys():
 177         # TODO Check that the builtin is actually callable
 178         builtin_dependencies.add(function_call.function.value)
 179
 180         return CFunctionCallExpression(
 181             name='builtin$' + function_call.function.value,
 182             arguments=tuple(
 183                 transform_expression(builtin_dependencies, symbol_list, arg)
 184                 for arg in function_call.arguments
 185             ),
 186         )
 187
 188     raise Exception()
 189
 190 def transform_statement(builtin_dependencies, symbol_list, statement):
 191     return {
 192         parsing.FurAssignmentStatement: transform_assignment_statement,
 193         parsing.FurFunctionCallExpression: transform_function_call_expression,
 194     }[type(statement)](builtin_dependencies, symbol_list, statement)
 195
 196 def transform(program):
 197     builtins = set()
 198     symbol_list = []
 199
 200     c_statements = [
 201         transform_statement(builtins, symbol_list, statement) for statement in program.statement_list
 202     ]
 203
 204     standard_libraries = set()
 205     for builtin in builtins:
 206         for standard_library in BUILTINS[builtin]:
 207             standard_libraries.add(standard_library)
 208
 209     return CProgram(
 210         builtins=builtins,
 211         statements=c_statements,
 212         standard_libraries=standard_libraries,
 213         symbol_list=symbol_list,
 214     )
 215
 216
 217 if __name__ == '__main__':
 218     import unittest
 219
 220     unittest.main()