o hK(@sdZddlZddlmZddlmZmZddlm Z m Z gdZ ddZ ej dd d d d Zdd dZe dddej dd d ddZe de ddddddZdS)aPFunctions for reading and writing graphs in the *sparse6* format. The *sparse6* file format is a space-efficient format for large sparse graphs. For small graphs or large dense graphs, use the *graph6* file format. For more information, see the `sparse6`_ homepage. .. _sparse6: https://users.cecs.anu.edu.au/~bdm/data/formats.html N) NetworkXError) data_to_n n_to_data)not_implemented_for open_file)from_sparse6_bytes read_sparse6to_sparse6_bytes write_sparse6c #st|}|dkr td|rdVdVt|D] }tt|dVqdd>|kr8d7d>|ks.fdd}td d |D}gd }|D]F\}} ||krdd  || qO||dkr{|d7}d || qO|}d ||d  || qOd kr|d>krt d kr||dkrˆd  dgt d n dgt d fd dt d td D} | D] }tt|dVqdVdS)a%Yield bytes in the sparse6 encoding of a graph. `G` is an undirected simple graph. `nodes` is the list of nodes for which the node-induced subgraph will be encoded; if `nodes` is the list of all nodes in the graph, the entire graph will be encoded. `header` is a Boolean that specifies whether to generate the header ``b'>>sparse6<<'`` before the remaining data. This function generates `bytes` objects in the following order: 1. the header (if requested), 2. the encoding of the number of nodes, 3. each character, one-at-a-time, in the encoding of the requested node-induced subgraph, 4. a newline character. This function raises :exc:`ValueError` if the graph is too large for the graph6 format (that is, greater than ``2 ** 36`` nodes). l@z?sparse6 is only defined if number of nodes is less than 2 ** 36 >>sparse6<<:?csfddtDS)zBig endian k-bit encoding of xcs(g|]}dd|>@rdndqS)rr.0i)kxrn/var/www/html/construction_image-detection-poc/venv/lib/python3.10/site-packages/networkx/readwrite/sparse6.py =s(z8_generate_sparse6_bytes..enc..)ranger)rrrenc;sz$_generate_sparse6_bytes..enccss(|]\}}t||t||fVqdS)N)maxmin)ruvrrr ?s&z*_generate_sparse6_bytes..rcslg|]2}|dd>|dd>|dd>|dd>|dd>|dd>qS)rrrr)bitsrrrZsz+_generate_sparse6_bytes.. N) len ValueErrorrstrencodechrsortededgesappendextendr) Gnodesheaderndrr,curvrrdatar)r$rr_generate_sparse6_bytessT         2    r6T)graphs returns_graphc s |dr |dd}|dstddd|ddD}t|\}dd>|kr7d7d>|ks-fd d }d }t}|t|d }|D]+\}}|dkr\|d7}||ksd||krfn||krm|}qP|||rud }|||qP|st |}|S)aVRead an undirected graph in sparse6 format from string. Parameters ---------- string : string Data in sparse6 format Returns ------- G : Graph Raises ------ NetworkXError If the string is unable to be parsed in sparse6 format Examples -------- >>> G = nx.from_sparse6_bytes(b":A_") >>> sorted(G.edges()) [(0, 1), (0, 1), (0, 1)] See Also -------- read_sparse6, write_sparse6 References ---------- .. [1] Sparse6 specification r Nr z!Expected leading colon in sparse6cSsg|]}|dqS)r r)rcrrrrsz&from_sparse6_bytes..rc3st}d}d} |dkr!zt|}Wn tyYdSwd}|d8}||?d@}|d|>d@}|}|krZzt|}Wn tyIYdSwd}|d>|}|d7}|ks9||?}|}||fVq )z6Returns stream of pairs b[i], x[i] for sparse6 format.Nrrr)iternext StopIteration)chunksr3dLenbrxLenr5rrr parseDatas<        z%from_sparse6_bytes..parseDatarFT) startswithrrnx MultiGraphadd_nodes_fromrhas_edgeadd_edgeGraph) stringcharsr2rCrr/ multigraphr@rrrBrris8 "       rcCs2|dur ||}tj|dd}dt|||S)aConvert an undirected graph to bytes in sparse6 format. Parameters ---------- G : Graph (undirected) nodes: list or iterable Nodes are labeled 0...n-1 in the order provided. If None the ordering given by ``G.nodes()`` is used. header: bool If True add '>>sparse6<<' bytes to head of data. Raises ------ NetworkXNotImplemented If the graph is directed. ValueError If the graph has at least ``2 ** 36`` nodes; the sparse6 format is only defined for graphs of order less than ``2 ** 36``. Examples -------- >>> nx.to_sparse6_bytes(nx.path_graph(2)) b'>>sparse6<<:An\n' See Also -------- to_sparse6_bytes, read_sparse6, write_sparse6_bytes Notes ----- The returned bytes end with a newline character. The format does not support edge or node labels. References ---------- .. [1] Graph6 specification Nr+ordering)subgraphrEconvert_node_labels_to_integersjoinr6)r/r0r1rrrr s, r rb)modecCsFg}|D]}|}t|sq|t|qt|dkr!|dS|S)aRead an undirected graph in sparse6 format from path. Parameters ---------- path : file or string File or filename to write. Returns ------- G : Graph/Multigraph or list of Graphs/MultiGraphs If the file contains multiple lines then a list of graphs is returned Raises ------ NetworkXError If the string is unable to be parsed in sparse6 format Examples -------- You can read a sparse6 file by giving the path to the file:: >>> import tempfile >>> with tempfile.NamedTemporaryFile(delete=False) as f: ... _ = f.write(b">>sparse6<<:An\n") ... _ = f.seek(0) ... G = nx.read_sparse6(f.name) >>> list(G.edges()) [(0, 1)] You can also read a sparse6 file by giving an open file-like object:: >>> import tempfile >>> with tempfile.NamedTemporaryFile() as f: ... _ = f.write(b">>sparse6<<:An\n") ... _ = f.seek(0) ... G = nx.read_sparse6(f) >>> list(G.edges()) [(0, 1)] See Also -------- read_sparse6, from_sparse6_bytes References ---------- .. [1] Sparse6 specification rr)stripr&r-r)pathglistlinerrrrs4 rdirectedrwbcCs@|dur ||}tj|dd}t|||D]}||qdS)aWrite graph G to given path in sparse6 format. Parameters ---------- G : Graph (undirected) path : file or string File or filename to write nodes: list or iterable Nodes are labeled 0...n-1 in the order provided. If None the ordering given by G.nodes() is used. header: bool If True add '>>sparse6<<' string to head of data Raises ------ NetworkXError If the graph is directed Examples -------- You can write a sparse6 file by giving the path to the file:: >>> import tempfile >>> with tempfile.NamedTemporaryFile(delete=False) as f: ... nx.write_sparse6(nx.path_graph(2), f.name) ... print(f.read()) b'>>sparse6<<:An\n' You can also write a sparse6 file by giving an open file-like object:: >>> with tempfile.NamedTemporaryFile() as f: ... nx.write_sparse6(nx.path_graph(2), f) ... _ = f.seek(0) ... print(f.read()) b'>>sparse6<<:An\n' See Also -------- read_sparse6, from_sparse6_bytes Notes ----- The format does not support edge or node labels. References ---------- .. [1] Sparse6 specification Nr+rN)rQrErRr6write)r/rWr0r1r@rrrr =s 8  r )NT)__doc__networkxrEnetworkx.exceptionrnetworkx.readwrite.graph6rrnetworkx.utilsrr__all__r6 _dispatchablerr rr rrrrs   R  a 2  >