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     return 'stringLiteral(STRING_LITERAL_LIST[{}])'.format(c_string_literal.index)
  16
  17 CONSTANT_EXPRESSION_MAPPING = {
  18     'true':     'TRUE',
  19     'false':    'FALSE',
  20 }
  21
  22 def generate_constant_expression(c_constant_expression):
  23     return CONSTANT_EXPRESSION_MAPPING[c_constant_expression.value]
  24
  25 def generate_symbol_expression(c_symbol_expression):
  26     return 'Environment_get(environment, SYMBOL_LIST[{}] /* symbol: {} */)'.format(
  27         c_symbol_expression.symbol_list_index,
  28         c_symbol_expression.symbol,
  29     )
  30
  31 def generate_expression(expression):
  32     if isinstance(expression, transformation.CNegationExpression):
  33         return generate_negation_expression(expression)
  34
  35     if isinstance(expression, transformation.CFunctionCallExpression):
  36         return generate_function_call(expression)
  37
  38     LITERAL_TYPE_MAPPING = {
  39         transformation.CIntegerLiteral: generate_integer_literal,
  40         transformation.CStringLiteral: generate_string_literal,
  41         transformation.CConstantExpression: generate_constant_expression,
  42         transformation.CSymbolExpression: generate_symbol_expression,
  43     }
  44
  45     if type(expression) in LITERAL_TYPE_MAPPING:
  46         return LITERAL_TYPE_MAPPING[type(expression)](expression)
  47
  48     if isinstance(expression, transformation.CFunctionCallForFurInfixOperator):
  49         return 'builtin${}({}, {})'.format(
  50             expression.name,
  51             generate_expression(expression.left),
  52             generate_expression(expression.right),
  53         )
  54
  55     raise Exception('Could not handle expresssion "{}"'.format(expression))
  56
  57 def generate_negation_expression(c_negation_expression):
  58     return 'builtin$negate({})'.format(
  59         generate_expression(c_negation_expression.value)
  60     )
  61
  62 def generate_function_call(c_function_call):
  63     return '{}({})'.format(
  64         c_function_call.name,
  65         ', '.join(generate_expression(argument) for argument in c_function_call.arguments),
  66     )
  67
  68 def generate_expression_statement(c_function_call_statement):
  69     # TODO Do we need to garbage collect the results of arbitrary statements?
  70     return '{};'.format(generate_expression(c_function_call_statement))
  71
  72 def generate_assignment_statement(c_assignment_statement):
  73     return 'Environment_set(environment, SYMBOL_LIST[{}] /* symbol: {} */, {});'.format(
  74         c_assignment_statement.target_symbol_list_index,
  75         c_assignment_statement.target,
  76         generate_expression(c_assignment_statement.expression),
  77     )
  78
  79 def generate_statement(statement):
  80     if isinstance(statement, transformation.CAssignmentStatement):
  81         return generate_assignment_statement(statement)
  82
  83     return generate_expression_statement(statement)
  84
  85 def generate(program):
  86     template = ENV.get_template('program.c')
  87     return template.render(
  88         builtins=list(sorted(program.builtin_set)),
  89         statements=[generate_statement(statement) for statement in program.statements],
  90         standard_libraries=list(sorted(program.standard_libraries)),
  91         string_literal_list=program.string_literal_list,
  92         symbol_list=program.symbol_list,
  93     )
  94
  95 if __name__ == '__main__':
  96     import unittest
  97
  98     unittest.main()