Created
April 6, 2024 19:12
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from contextlib import contextmanager | |
class Node: | |
def __init__(self, name, args, children): | |
self.name = name | |
self.args = args | |
self.children = children | |
def __str__(self): | |
out = [] | |
if self.name: | |
out.append(str(self.name)) | |
else: | |
out.append("node") | |
if self.args: | |
out.append("(") | |
out.append(",".join(f"{k}:{v}" for k,v in self.args.items())) | |
out.append(")") | |
if self.children: | |
out.append("{") | |
out.append(",".join(f"{c}" for c in self.children)) | |
out.append("}") | |
return "".join(out) | |
class Builder: | |
def __init__(self): | |
self.nodes = [] | |
self.inside = [] | |
def Node(self, name=None, **args): | |
self.nodes.append(Node(name, args, [])) | |
@contextmanager | |
def Group(self, name=None, **args): | |
self.inside.append(name) | |
old_nodes = self.nodes | |
self.nodes = [] | |
yield | |
old_nodes.append(Node(name, args, self.nodes)) | |
self.nodes = old_nodes | |
def build(): | |
def _decorate(fn): | |
b = Builder() | |
fn(b) | |
if len(b.nodes) == 1: | |
return b.nodes[0] | |
return Node(None, {}, b.nodes) | |
return _decorate | |
def main(argv): | |
@build() | |
def node(b): | |
b.Node("one") | |
with b.Group("two"): | |
b.Node(1) | |
b.Node(2) | |
b.Node(3) | |
b.Node("three") | |
print(node) | |
if __name__ == "__main__": | |
import sys | |
sys.exit(main(sys.argv[1:])) |
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