mirror of https://github.com/m-labs/artiq
90 lines
2.4 KiB
Python
90 lines
2.4 KiB
Python
"""
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:class:`TypedtreePrinter` prints a human-readable representation of typedtrees.
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"""
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from pythonparser import algorithm, ast
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from .. import types, asttyped
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class TypedtreePrinter(algorithm.Visitor):
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def __init__(self):
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self.str = None
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self.level = None
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self.last_nl = None
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self.type_printer = None
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def print(self, node):
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try:
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self.str = ""
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self.level = 0
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self.last_nl = 0
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self.type_printer = types.TypePrinter()
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self.visit(node)
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self._nl()
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return self.str
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finally:
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self.str = None
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self.level = None
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self.last_nl = 0
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self.type_printer = None
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def _nl(self):
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# self.str += "·"
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if len(self.str) != self.last_nl:
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self.str += "\n" + (" " * self.level)
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self.last_nl = len(self.str)
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def _indent(self):
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self.level += 1
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self._nl()
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def _dedent(self):
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self._nl()
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self.level -= 1
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self.str = self.str[:-2]
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self.last_nl -= 2
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def visit(self, obj):
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if isinstance(obj, ast.AST):
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attrs = set(obj._fields) - {'ctx'}
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if isinstance(obj, asttyped.commontyped):
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attrs.update(set(obj._types))
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for attr in set(attrs):
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if not getattr(obj, attr):
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attrs.remove(attr) # omit falsey stuff
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self.str += obj.__class__.__name__ + "("
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if len(attrs) > 1:
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self._indent()
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for attr in attrs:
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if len(attrs) > 1:
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self._nl()
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self.str += attr + "="
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self.visit(getattr(obj, attr))
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if len(attrs) > 1:
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self._nl()
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if len(attrs) > 1:
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self._dedent()
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self.str += ")"
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elif isinstance(obj, types.Type):
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self.str += self.type_printer.name(obj, max_depth=0)
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elif isinstance(obj, list):
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self.str += "["
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if len(obj) > 1:
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self._indent()
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for elem in obj:
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if len(obj) > 1:
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self._nl()
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self.visit(elem)
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if len(obj) > 1:
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self._nl()
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if len(obj) > 1:
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self._dedent()
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self.str += "]"
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else:
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self.str += repr(obj)
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