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
  27 CONSTANT_EXPRESSION_MAPPING = {
  28     'true':     'TRUE',
  29     'false':    'FALSE',
  30 }
  31
  32 def generate_constant_expression(c_constant_expression):
  33     return CONSTANT_EXPRESSION_MAPPING[c_constant_expression.value]
  34
  35 def generate_symbol_expression(c_symbol_expression):
  36     return 'Environment_get(environment, SYMBOL_LIST[{}] /* symbol: {} */)'.format(
  37         c_symbol_expression.symbol_list_index,
  38         c_symbol_expression.symbol,
  39     )
  40
  41 def generate_expression(c_argument):
  42     if isinstance(c_argument, transformation.CNegationExpression):
  43         return generate_negation_expression(c_argument)
  44
  45     if isinstance(c_argument, transformation.CFunctionCallExpression):
  46         return generate_function_call(c_argument)
  47
  48     LITERAL_TYPE_MAPPING = {
  49         transformation.CIntegerLiteral: generate_integer_literal,
  50         transformation.CStringLiteral: generate_string_literal,
  51         transformation.CConstantExpression: generate_constant_expression,
  52         transformation.CSymbolExpression: generate_symbol_expression,
  53     }
  54
  55     if type(c_argument) in LITERAL_TYPE_MAPPING:
  56         return LITERAL_TYPE_MAPPING[type(c_argument)](c_argument)
  57
  58     INFIX_TYPE_MAPPING = {
  59         transformation.CAdditionExpression: 'add',
  60         transformation.CSubtractionExpression: 'subtract',
  61         transformation.CMultiplicationExpression: 'multiply',
  62         transformation.CIntegerDivisionExpression: 'integerDivide',
  63         transformation.CModularDivisionExpression: 'modularDivide',
  64         transformation.CEqualityExpression: 'equals',
  65         transformation.CInequalityExpression: 'notEquals',
  66         transformation.CGreaterThanExpression: 'greaterThan',
  67         transformation.CLessThanExpression: 'lessThan',
  68         transformation.CGreaterThanOrEqualExpression: 'greaterThanOrEqual',
  69         transformation.CLessThanOrEqualExpression: 'lessThanOrEqual',
  70         transformation.CAndExpression: 'and',
  71     }
  72
  73     return 'builtin${}({}, {})'.format(
  74         INFIX_TYPE_MAPPING[type(c_argument)],
  75         generate_expression(c_argument.left),
  76         generate_expression(c_argument.right),
  77     )
  78
  79 def generate_negation_expression(c_negation_expression):
  80     return 'builtin$negate({})'.format(
  81         generate_expression(c_negation_expression.value)
  82     )
  83
  84 def generate_function_call(c_function_call):
  85     return '{}({})'.format(
  86         c_function_call.name,
  87         ', '.join(generate_expression(argument) for argument in c_function_call.arguments),
  88     )
  89
  90 def generate_expression_statement(c_function_call_statement):
  91     # TODO Do we need to garbage collect the results of arbitrary statements?
  92     return '{};'.format(generate_expression(c_function_call_statement))
  93
  94 def generate_assignment_statement(c_assignment_statement):
  95     return 'Environment_set(environment, SYMBOL_LIST[{}] /* symbol: {} */, {});'.format(
  96         c_assignment_statement.target_symbol_list_index,
  97         c_assignment_statement.target,
  98         generate_expression(c_assignment_statement.expression),
  99     )
 100
 101 def generate_statement(statement):
 102     if isinstance(statement, transformation.CAssignmentStatement):
 103         return generate_assignment_statement(statement)
 104
 105     return generate_expression_statement(statement)
 106
 107 def generate(c_program):
 108     template = ENV.get_template('program.c')
 109     return template.render(
 110         builtins=list(sorted(c_program.builtins)),
 111         statements=[generate_statement(statement) for statement in c_program.statements],
 112         standard_libraries=list(sorted(c_program.standard_libraries)),
 113         symbol_list=c_program.symbol_list,
 114     )
 115
 116 if __name__ == '__main__':
 117     import unittest
 118
 119     unittest.main()