python-mvdxml/mvdxml_expression.py at master · opensourceBIM/python-mvdxml · GitHub

History

46 lines (36 loc) · 1.41 KB

Raw

from __future__ import annotations

from dataclasses import dataclass

import pyparsing as pp

@dataclass(frozen=True)

class node:

a: str | None

b: str | None

c: str

@classmethod

def from_tokens(cls, args: pp.ParseResults) -> node:

if len(args) == 3 and args[1] == "=":

return cls(args[0], None, args[2])

if (args[1], args[3], args[4]) == ("[", "]", "="):

return cls(args[0], args[2], args[5])

return cls(None, args[1], args[4])

def __repr__(self):

return "{%s[%s]=%s}" % (self.a, self.b, self.c)

word = pp.Word(pp.alphanums + "_" + " " + "/" + "#")

quoted = pp.Combine("'" + word + "'")

bool_value = pp.CaselessLiteral("TRUE") | pp.CaselessLiteral("FALSE")

ref_val = word + "[" + word + "]"

rhs = quoted | bool_value | ref_val | word

stmt = (pp.Optional(word) + pp.Optional("[" + word + "]") + "=" + rhs).setParseAction(

node.from_tokens

)

bool_op = pp.CaselessLiteral("AND") | pp.CaselessLiteral("OR")

grammar = stmt + pp.Optional(pp.OneOrMore(bool_op + stmt))

def parse(exprs: str) -> tuple[tuple[node | str, ...], ...]:

parsed: list[tuple[node | str, ...]] = []

for expression in exprs.split(";"):

expression = "".join(

character for character in expression if character not in "\r\n"

)

if expression:

parsed.append(tuple(grammar.parseString(expression, parseAll=True)))

return tuple(parsed)

python-mvdxml/mvdxml_expression.py at master · opensourceBIM/python-mvdxml · GitHub

Uh oh!

Expand file tree

Breadcrumbs

mvdxml_expression.py

Latest commit

History

Breadcrumbs

mvdxml_expression.py

File metadata and controls