],
)
+FurLambdaExpression = collections.namedtuple(
+ 'FurLambdaExpression',
+ (
+ 'argument_name_list',
+ 'statement_list',
+ ),
+)
+
FurStringLiteralExpression = collections.namedtuple(
'FurStringLiteralExpression',
[
FurSymbolExpression = collections.namedtuple(
'FurSymbolExpression',
[
- 'value',
+ 'metadata',
+ 'symbol',
],
)
FurNegationExpression = collections.namedtuple(
'FurNegationExpression',
[
+ 'metadata',
'value',
],
)
FurInfixExpression = collections.namedtuple(
'FurInfixExpression',
[
+ 'metadata',
'order',
'operator',
'left',
],
)
+FurListLiteralExpression = collections.namedtuple(
+ 'FurListLiteralExpression',
+ [
+ 'item_expression_list',
+ ],
+)
+
+FurIfExpression = collections.namedtuple(
+ 'FurIfExpression',
+ [
+ 'condition_expression',
+ 'if_statement_list',
+ 'else_statement_list',
+ ],
+)
+
+FurSymbolExpressionPair = collections.namedtuple(
+ 'FurSymbolExpressionPair',
+ [
+ 'symbol',
+ 'expression',
+ ],
+)
+
+FurStructureLiteralExpression = collections.namedtuple(
+ 'FurStructureLiteralExpression',
+ [
+ 'fields',
+ ],
+)
+
def _integer_literal_expression_parser(index, tokens):
failure = (False, index, None)
return True, index, FurIntegerLiteralExpression(integer=value)
def _string_literal_expression_parser(index, tokens):
+ if tokens[index].type == 'double_quoted_string_literal':
+ return (True, index + 1, FurStringLiteralExpression(string=tokens[index].match[1:-1]))
+
if tokens[index].type == 'single_quoted_string_literal':
return (True, index + 1, FurStringLiteralExpression(string=tokens[index].match[1:-1]))
def _symbol_expression_parser(index, tokens):
if tokens[index].type == 'symbol':
- return (True, index + 1, FurSymbolExpression(value=tokens[index].match))
+ return (
+ True,
+ index + 1,
+ FurSymbolExpression(
+ metadata=tokens[index].metadata,
+ symbol=tokens[index].match,
+ ),
+ )
return (False, index, None)
-def _parenthese_wrapped_parser(internal_parser):
+def _wrapped_parser(open_token, close_token, internal_parser):
def result_parser(index, tokens):
failure = (False, index, None)
- if tokens[index].type == 'open_parenthese':
+ if tokens[index].type == open_token:
index += 1
else:
return failure
if not success:
return failure
- if tokens[index].type == 'close_parenthese':
+ if tokens[index].type == close_token:
index += 1
else:
- raise Exception('Expected ")" on line {}, found "{}"'.format(
+ # TODO Put the actual expected character in the error message
+ raise Exception('Expected closing token on line {}, found "{}"'.format(
tokens[index].line,
tokens[index].match,
))
return result_parser
+def _bracket_wrapped_parser(internal_parser):
+ return _wrapped_parser('open_bracket', 'close_bracket', internal_parser)
+
+def _parenthese_wrapped_parser(internal_parser):
+ return _wrapped_parser('open_parenthese', 'close_parenthese', internal_parser)
+
def _parenthesized_expression_parser(index, tokens):
return _parenthese_wrapped_parser(_expression_parser)(index, tokens)
-def _negation_expression_parser(index, tokens):
+def symbol_expression_pair_parser(index, tokens):
failure = (False, index, None)
- if tokens[index].match != '-':
+ if tokens[index].type == 'symbol':
+ symbol = tokens[index].match
+ index += 1
+ else:
return failure
- success, index, value = _literal_level_expression_parser(index + 1, tokens)
+ if tokens[index].type == 'colon':
+ index += 1
+ else:
+ return failure
+
+ success, index, expression = _expression_parser(index, tokens)
if not success:
+ raise Exception()
+
+ return (
+ True,
+ index,
+ FurSymbolExpressionPair(
+ symbol=symbol,
+ expression=expression,
+ ),
+ )
+
+def _structure_literal_parser(index, tokens):
+ success, index, result = _parenthese_wrapped_parser(_comma_separated_list_parser(symbol_expression_pair_parser))(index, tokens)
+ return (
+ success,
+ index,
+ FurStructureLiteralExpression(
+ fields=result,
+ ),
+ )
+
+def _lambda_expression_parser(index, tokens):
+ failure = (False, index, None)
+
+ if tokens[index].type == 'keyword' and tokens[index].match == 'lambda':
+ index += 1
+ else:
return failure
- return (True, index, FurNegationExpression(value=value))
+ if tokens[index].type == 'open_parenthese':
+ index += 1
+ else:
+ raise Exception('Expected "(", found "{}" on line {}'.format(
+ tokens[index].match,
+ tokens[index].metadata.line,
+ ))
+
+ success, index, argument_name_list = _comma_separated_list_parser(_symbol_expression_parser)(
+ index,
+ tokens,
+ )
+
+ if tokens[index].type == 'close_parenthese':
+ index += 1
+ else:
+ raise Exception('Expected ")", found "{}" on line {}'.format(
+ tokens[index].match,
+ tokens[index].line,
+ ))
+
+ if tokens[index].match == 'do':
+ index += 1
+ else:
+ return failure
+
+ success, index, statement_list = _zero_or_more_parser(tuple, _statement_parser)(index, tokens)
+
+ _, index, _ = consume_newlines(index, tokens)
+
+ if tokens[index].type == 'keyword' and tokens[index].match == 'end':
+ index += 1
+ else:
+ return failure
+
+ return True, index, FurLambdaExpression(
+ argument_name_list=tuple(an.symbol for an in argument_name_list),
+ statement_list=statement_list,
+ )
+
+
+
+def _list_literal_expression_parser(index, tokens):
+ failure = (False, index, None)
+
+ success, index, item_expression_list = _bracket_wrapped_parser(_comma_separated_expression_list_parser)(index, tokens)
+
+ if success:
+ return success, index, FurListLiteralExpression(
+ item_expression_list=item_expression_list,
+ )
+ else:
+ return failure
def _literal_level_expression_parser(index, tokens):
return _or_parser(
- _negation_expression_parser,
+ _list_item_expression_parser,
_function_call_expression_parser,
_parenthesized_expression_parser,
_integer_literal_expression_parser,
_string_literal_expression_parser,
+ _list_literal_expression_parser,
+ _lambda_expression_parser,
_symbol_expression_parser,
+ _structure_literal_parser,
+ )(index, tokens)
+
+def _dot_expression_parser(index, tokens):
+ return _left_recursive_infix_operator_parser(
+ lambda token: token.type == 'period',
+ _literal_level_expression_parser,
+ 'dot_level',
+ )(index, tokens)
+
+def _negation_expression_parser(index, tokens):
+ failure = (False, index, None)
+
+ if tokens[index].match != '-':
+ return failure
+
+ metadata = tokens[index].metadata
+
+ success, index, value = _dot_expression_parser(index + 1, tokens)
+
+ if not success:
+ return failure
+
+ return (True, index, FurNegationExpression(metadata=metadata, value=value))
+
+def _negation_level_expression_parser(index, tokens):
+ return _or_parser(
+ _dot_expression_parser,
+ _negation_expression_parser,
)(index, tokens)
def _left_recursive_infix_operator_parser(operator_token_matcher, operand_parser, order):
if success:
result = FurInfixExpression(
+ metadata=tokens[index].metadata,
order=order,
operator=tokens[index].match,
left=result,
def _multiplication_level_expression_parser(index, tokens):
return _left_recursive_infix_operator_parser(
lambda token: token.type == 'multiplication_level_operator',
- _literal_level_expression_parser,
+ _negation_level_expression_parser,
'multiplication_level',
)(index, tokens)
items = []
+ _, index, _ = consume_newlines(index, tokens)
+
success, index, item = subparser(index, tokens)
if success:
return (True, start_index, ())
while success and index < len(tokens) and tokens[index].type == 'comma':
+ index += 1
success = False
- if index + 1 < len(tokens):
- success, try_index, item = subparser(index + 1, tokens)
+ _, index, _ = consume_newlines(index, tokens)
+
+ if index < len(tokens):
+ success, try_index, item = subparser(index, tokens)
if success:
items.append(item)
def _comma_separated_expression_list_parser(index, tokens):
return _comma_separated_list_parser(_expression_parser)(index, tokens)
+FurListItemExpression = collections.namedtuple(
+ 'FurListItemExpression',
+ [
+ 'list_expression',
+ 'metadata',
+ 'index_expression',
+ ],
+)
+
FurFunctionCallExpression = collections.namedtuple(
'FurFunctionCallExpression',
[
+ 'metadata',
'function',
'arguments',
],
],
)
+def _list_item_expression_parser(index, tokens):
+ failure = (False, index, None)
+
+ # We have to be careful what expressions we add here. Otherwise expressions
+ # like "a + b[0]" become ambiguous to the parser.
+ success, index, list_expression = _or_parser(
+ _symbol_expression_parser,
+ _parenthesized_expression_parser,
+ )(index, tokens)
+
+ if not success:
+ return failure
+
+ metadata = tokens[index].metadata
+
+ success, index, index_expression = _bracket_wrapped_parser(_expression_parser)(
+ index,
+ tokens,
+ )
+
+ if not success:
+ return failure
+
+ while success and index < len(tokens):
+ # "list_expression" is actually the full list item expression if the next parse attempt doesn't succeed
+ # We can't give this a better name without a bunch of checks, however.
+ list_expression = FurListItemExpression(
+ list_expression=list_expression,
+ metadata=metadata,
+ index_expression=index_expression,
+ )
+
+ metadata = tokens[index].metadata
+
+ success, index, index_expression = _bracket_wrapped_parser(_expression_parser)(
+ index,
+ tokens,
+ )
+
+ return True, index, list_expression
+
def _function_call_expression_parser(index, tokens):
failure = (False, index, None)
if not success:
return failure
+ metadata = tokens[index].metadata
+
success, index, arguments = _parenthese_wrapped_parser(_comma_separated_expression_list_parser)(
index,
tokens,
# "function" is actually the full function call if the next parse attempt doesn't succeed
# We can't give this a better name without a bunch of checks, however.
function = FurFunctionCallExpression(
+ metadata=metadata,
function=function,
arguments=arguments,
)
+ metadata = tokens[index].metadata
+
success, index, arguments = _parenthese_wrapped_parser(_comma_separated_expression_list_parser)(
index,
tokens,
return True, index, function
-_expression_parser = _or_level_expression_parser
+def _if_expression_parser(index, tokens):
+ failure = (False, index, None)
+
+ if tokens[index].match == 'if':
+ index += 1
+ else:
+ return failure
+
+ success, index, condition_expression = _or_level_expression_parser(index, tokens)
+
+ if not success:
+ raise Exception('Expected condition after "if" on line {}'.format(tokens[index].line))
+
+ if tokens[index].match == 'do':
+ index += 1
+ else:
+ raise Exception('Expected "do" after "if" on line {}'.format(tokens[index].line))
+
+
+ success, index, if_statement_list = _zero_or_more_parser(tuple, _statement_parser)(index, tokens)
+ _, index, _ = consume_newlines(index, tokens)
+
+ if tokens[index].match == 'else':
+ index += 1
+ success, index, else_statement_list = _zero_or_more_parser(tuple, _statement_parser)(index, tokens)
+ _, index, _ = consume_newlines(index, tokens)
+ else:
+ else_statement_list = ()
+
+ if tokens[index].match == 'end':
+ index += 1
+ else:
+ raise Exception('Expected "end" after "if" on line {}'.format(tokens[index].line))
+
+ return (
+ True,
+ index,
+ FurIfExpression(
+ condition_expression=condition_expression,
+ if_statement_list=if_statement_list,
+ else_statement_list=else_statement_list,
+ ),
+ )
+
+_expression_parser = _or_parser(
+ _or_level_expression_parser,
+ _if_expression_parser, # This should always be at the top level
+)
def _expression_statement_parser(index, tokens):
failure = (False, index, None)
if tokens[index].type == 'symbol':
target = tokens[index].match
- target_assignment_line = tokens[index].line
+ target_assignment_line = tokens[index].metadata.line
index += 1
else:
tokens[index].line,
))
- if tokens[index].type == 'symbol' and tokens[index].match == 'do':
+ if tokens[index].match == 'do':
index += 1
else:
return failure
return True, index, FurFunctionDefinitionStatement(
name=name,
- argument_name_list=tuple(an.value for an in argument_name_list),
+ argument_name_list=tuple(an.symbol for an in argument_name_list),
statement_list=statement_list,
)
projects / fur / blobdiff