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ade67ca899
* Create Swift libSyntax API This patch is an initial implementation of the Swift libSyntax API. It aims to provide all features of the C++ API but exposed to Swift. It currently resides in SwiftExperimental and will likely exist in a molten state for a while. * Only build SwiftSyntax on macOS
56 lines
1.9 KiB
Python
56 lines
1.9 KiB
Python
# flake8: noqa I201
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from Token import SYNTAX_TOKEN_MAP
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from kinds import kind_to_type, lowercase_first_word
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class Child(object):
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"""
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A child of a node, that may be declared optional or a token with a
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restricted subset of acceptable kinds or texts.
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"""
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def __init__(self, name, kind, is_optional=False,
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token_choices=None, text_choices=None):
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self.name = name
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self.swift_name = lowercase_first_word(name)
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self.syntax_kind = kind
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self.swift_syntax_kind = lowercase_first_word(self.syntax_kind)
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self.type_name = kind_to_type(self.syntax_kind)
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# If the child has "token" anywhere in the kind, it's considered
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# a token node. Grab the existing reference to that token from the
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# global list.
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self.token_kind = \
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self.syntax_kind if "Token" in self.syntax_kind else None
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self.token = SYNTAX_TOKEN_MAP.get(self.token_kind)
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self.is_optional = is_optional
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# A restricted set of token kinds that will be accepted for this
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# child.
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self.token_choices = []
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if self.token:
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self.token_choices.append(self.token)
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for choice in token_choices or []:
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token = SYNTAX_TOKEN_MAP[choice]
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self.token_choices.append(token)
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# A list of valid text for tokens, if specified.
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# This will force validation logic to check the text passed into the
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# token against the choices.
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self.text_choices = text_choices or []
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def is_token(self):
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"""
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Returns true if this child has a token kind.
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"""
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return self.token_kind is not None
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def main_token(self):
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"""
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Returns the first choice from the token_choices if there are any,
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otherwise returns None.
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"""
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if self.token_choices:
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return self.token_choices[0]
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return None
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