122 lines
3.0 KiB
Python
122 lines
3.0 KiB
Python
from smnp.ast.node.ignore import IgnoredNode
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from smnp.ast.node.model import Node, ParseResult
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from smnp.ast.node.none import NoneNode
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from smnp.ast.parser import Parser
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from smnp.token.type import TokenType
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def abstractIterableParser(iterableNodeType, openTokenType, closeTokenType, itemParser):
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class AbstractIterable(Node):
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def __init__(self, pos):
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super().__init__(pos)
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self.children = [NoneNode(), NoneNode()]
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@property
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def value(self):
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return self[0]
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@value.setter
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def value(self, value):
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self[0] = value
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@property
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def next(self):
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return self[1]
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@next.setter
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def next(self, value):
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self[1] = value
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class AbstractIterableTail(AbstractIterable):
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pass
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def abstractIterableParser(input):
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return Parser.oneOf(
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emptyIterable,
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openIterable
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)(input)
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def emptyIterable(input):
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def createNode(open, close):
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node = AbstractIterable(open.pos)
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node.value = open
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node.next = close
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return node
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return Parser.allOf(
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Parser.terminal(openTokenType),
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Parser.terminal(closeTokenType),
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createNode=createNode
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)(input)
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def openIterable(input):
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def createNode(open, item, tail):
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node = AbstractIterable(open.pos)
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node.value = item
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node.next = tail
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return node
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return Parser.allOf(
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Parser.terminal(openTokenType),
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itemParser,
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abstractIterableTailParser,
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createNode=createNode
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)(input)
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def abstractIterableTailParser(input):
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return Parser.oneOf(
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closeIterable,
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nextItem,
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)(input)
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def nextItem(input):
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def createNode(comma, item, tail):
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node = AbstractIterableTail(item.pos)
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node.value = item
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node.next = tail
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return node
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return Parser.allOf(
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Parser.terminal(TokenType.COMMA, doAssert=True),
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itemParser,
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abstractIterableTailParser,
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createNode=createNode
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)(input)
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def closeIterable(input):
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return Parser.terminal(closeTokenType)(input)
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return toFlatDesiredNode(iterableNodeType, abstractIterableParser)
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def toFlatDesiredNode(iterableNodeType, parser):
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def parse(input):
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result = parser(input)
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if result.result:
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value = flattenList(result.node)
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node = iterableNodeType(result.node.pos)
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node.children.clear()
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for v in value:
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node.append(v)
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return ParseResult.OK(node)
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return ParseResult.FAIL()
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return Parser(parse, "flat", [parser])
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def flattenList(node, output=None):
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if output is None:
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output = []
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if type(node.value) != IgnoredNode:
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output.append(node.value)
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if type(node.next) != IgnoredNode:
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flattenList(node.next, output)
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return output
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