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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
70 lines
2.2 KiB
Python
70 lines
2.2 KiB
Python
from __future__ import print_function
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import sys # noqa: I201
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from kinds import SYNTAX_BASE_KINDS, kind_to_type, lowercase_first_word
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def error(msg):
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print('error: ' + msg, file=sys.stderr)
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sys.exit(-1)
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class Node(object):
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"""
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A Syntax node, possibly with children.
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If the kind is "SyntaxCollection", then this node is considered a Syntax
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Collection that will expose itself as a typedef rather than a concrete
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subclass.
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"""
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def __init__(self, name, kind=None, children=None,
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element=None, element_name=None):
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self.syntax_kind = name
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self.swift_syntax_kind = lowercase_first_word(name)
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self.name = kind_to_type(self.syntax_kind)
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self.children = children or []
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self.base_kind = kind
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self.base_type = kind_to_type(self.base_kind)
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if self.base_kind not in SYNTAX_BASE_KINDS:
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error("unknown base kind '%s' for node '%s'" %
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(self.base_kind, self.syntax_kind))
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self.collection_element = element or ""
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# If there's a preferred name for the collection element that differs
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# from its supertype, use that.
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self.collection_element_name = element_name or self.collection_element
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self.collection_element_type = kind_to_type(self.collection_element)
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def is_base(self):
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"""
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Returns `True` if this node declares one of the base syntax kinds.
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"""
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return self.syntax_kind in SYNTAX_BASE_KINDS
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def is_syntax_collection(self):
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"""
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Returns `True` if this node is a subclass of SyntaxCollection.
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"""
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return self.base_kind == "SyntaxCollection"
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def requires_validation(self):
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"""
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Returns `True` if this node should have a `valitate` method associated.
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"""
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return self.is_buildable()
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def is_unknown(self):
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"""
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Returns `True` if this node is an `Unknown` syntax subclass.
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"""
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return "Unknown" in self.syntax_kind
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def is_buildable(self):
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"""
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Returns `True` if this node should have a builder associated.
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"""
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return not self.is_base() and \
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not self.is_unknown() and \
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not self.is_syntax_collection()
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