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Bindings to Parsito library

Project Description


The ufal.parsito is a Python binding to Parsito library <>.

The bindings is a straightforward conversion of the C++ bindings API. In Python 2, strings can be both unicode and UTF-8 encoded str, and the library always produces unicode. In Python 3, strings must be only str.

Wrapped C++ API

The C++ API being wrapped follows. For a API reference of the original C++ API, see <>.

Helper Structures

  typedef vector<int> Children;

  class Node {
    int id;          // 0 is root, >0 is sentence node, <0 is undefined
    string form;    // form
    string lemma;   // lemma
    string upostag; // universal part-of-speech tag
    string xpostag; // language-specific part-of-speech tag
    string feats;   // list of morphological features
    int head;       // head, 0 is root, <0 is without parent
    string deprel;  // dependency relation to the head
    string deps;    // secondary dependencies
    string misc;    // miscellaneous information

    Children children;

    node(int id = -1, string form = string());
  typedef std::vector<node> Nodes;

Main Classes

  class Tree {

    Nodes nodes;

    bool empty();
    void clear();
    node& addNode(string form);
    void setHead(int id, int head, string deprel);
    void unlinkAllNodes();

    static const std::string root_form;

  class TreeInputFormat {
    virtual void setText(string text);
    virtual bool nextTree(tree& t) = 0;
    string lastError() const;

    // Static factory methods
    static TreeInputFormat* newInputFormat(string name);
    static TreeInputFormat* newConlluInputFormat();

  class TreeOutputFormat {

    virtual string writeTree(const tree& t, const tree_input_format* additional_info = nullptr);

    // Static factory methods
    static TreeOutputFormat* newOutputFormat(string name);
    static TreeOutputFormat* newConlluOutputFormat();

  class Parser {
    virtual void parse(tree& t, unsigned beam_size = 0) const;

    enum { NO_CACHE = 0, FULL_CACHE = 2147483647};
    static Parser* load(string file, unsigned cache = 1000);

  class Version {
    unsigned major;
    unsigned minor;
    unsigned patch;
    string prerelease;

    static Version current();



Simple parsing example:

from ufal.parsito import *

# In Python2, wrap sys.stdin and sys.stdout to work with unicode.
if sys.version_info[0] < 3:
  import codecs
  import locale
  encoding = locale.getpreferredencoding()
  sys.stdin = codecs.getreader(encoding)(sys.stdin)
  sys.stdout = codecs.getwriter(encoding)(sys.stdout)

if len(sys.argv) == 1:
  sys.stderr.write('Usage: %s parser_file\n' % sys.argv[0])

sys.stderr.write('Loading parser: ')
parser = Parser.load(sys.argv[1])
if not parser:
  sys.stderr.write("Cannot load parser from file '%s'\n" % sys.argv[1])

conlluInput = TreeInputFormat.newInputFormat("conllu");
conlluOutput = TreeOutputFormat.newOutputFormat("conllu");
tree = Tree()

not_eof = True
while not_eof:
  text = ''

  # Read block
  while True:
    line = sys.stdin.readline()
    not_eof = bool(line)
    if not not_eof: break
    line = line.rstrip('\r\n')
    text += line
    text += '\n';
    if not line: break

  # Parse
  while conlluInput.nextTree(tree):

    output = conlluOutput.writeTree(tree, conlluInput)
  if conlluInput.lastError():
    sys.stderr.write("Cannot read input CoNLL-U: ")


Milan Straka <>

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