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<h1>Source code for nltk.ccg.lexicon</h1><div class="highlight"><pre>
<span></span><span class="c1"># Natural Language Toolkit: Combinatory Categorial Grammar</span>
<span class="c1">#</span>
<span class="c1"># Copyright (C) 2001-2021 NLTK Project</span>
<span class="c1"># Author: Graeme Gange <ggange@csse.unimelb.edu.au></span>
<span class="c1"># URL: <http://nltk.org/></span>
<span class="c1"># For license information, see LICENSE.TXT</span>
<span class="sd">"""</span>
<span class="sd">CCG Lexicons</span>
<span class="sd">"""</span>
<span class="kn">import</span> <span class="nn">re</span>
<span class="kn">from</span> <span class="nn">collections</span> <span class="kn">import</span> <span class="n">defaultdict</span>
<span class="kn">from</span> <span class="nn">nltk.ccg.api</span> <span class="kn">import</span> <span class="n">CCGVar</span><span class="p">,</span> <span class="n">Direction</span><span class="p">,</span> <span class="n">FunctionalCategory</span><span class="p">,</span> <span class="n">PrimitiveCategory</span>
<span class="kn">from</span> <span class="nn">nltk.internals</span> <span class="kn">import</span> <span class="n">deprecated</span>
<span class="kn">from</span> <span class="nn">nltk.sem.logic</span> <span class="kn">import</span> <span class="n">Expression</span>
<span class="c1"># ------------</span>
<span class="c1"># Regular expressions used for parsing components of the lexicon</span>
<span class="c1"># ------------</span>
<span class="c1"># Parses a primitive category and subscripts</span>
<span class="n">PRIM_RE</span> <span class="o">=</span> <span class="n">re</span><span class="o">.</span><span class="n">compile</span><span class="p">(</span><span class="sa">r</span><span class="s2">"""([A-Za-z]+)(\[[A-Za-z,]+\])?"""</span><span class="p">)</span>
<span class="c1"># Separates the next primitive category from the remainder of the</span>
<span class="c1"># string</span>
<span class="n">NEXTPRIM_RE</span> <span class="o">=</span> <span class="n">re</span><span class="o">.</span><span class="n">compile</span><span class="p">(</span><span class="sa">r</span><span class="s2">"""([A-Za-z]+(?:\[[A-Za-z,]+\])?)(.*)"""</span><span class="p">)</span>
<span class="c1"># Separates the next application operator from the remainder</span>
<span class="n">APP_RE</span> <span class="o">=</span> <span class="n">re</span><span class="o">.</span><span class="n">compile</span><span class="p">(</span><span class="sa">r</span><span class="s2">"""([\\/])([.,]?)([.,]?)(.*)"""</span><span class="p">)</span>
<span class="c1"># Parses the definition of the right-hand side (rhs) of either a word or a family</span>
<span class="n">LEX_RE</span> <span class="o">=</span> <span class="n">re</span><span class="o">.</span><span class="n">compile</span><span class="p">(</span><span class="sa">r</span><span class="s2">"""([\S_]+)\s*(::|[-=]+>)\s*(.+)"""</span><span class="p">,</span> <span class="n">re</span><span class="o">.</span><span class="n">UNICODE</span><span class="p">)</span>
<span class="c1"># Parses the right hand side that contains category and maybe semantic predicate</span>
<span class="n">RHS_RE</span> <span class="o">=</span> <span class="n">re</span><span class="o">.</span><span class="n">compile</span><span class="p">(</span><span class="sa">r</span><span class="s2">"""([^</span><span class="si">{}</span><span class="s2">]*[^ </span><span class="si">{}</span><span class="s2">])\s*(\{[^}]+\})?"""</span><span class="p">,</span> <span class="n">re</span><span class="o">.</span><span class="n">UNICODE</span><span class="p">)</span>
<span class="c1"># Parses the semantic predicate</span>
<span class="n">SEMANTICS_RE</span> <span class="o">=</span> <span class="n">re</span><span class="o">.</span><span class="n">compile</span><span class="p">(</span><span class="sa">r</span><span class="s2">"""\{([^}]+)\}"""</span><span class="p">,</span> <span class="n">re</span><span class="o">.</span><span class="n">UNICODE</span><span class="p">)</span>
<span class="c1"># Strips comments from a line</span>
<span class="n">COMMENTS_RE</span> <span class="o">=</span> <span class="n">re</span><span class="o">.</span><span class="n">compile</span><span class="p">(</span><span class="s2">"""([^#]*)(?:#.*)?"""</span><span class="p">)</span>
<div class="viewcode-block" id="Token"><a class="viewcode-back" href="../../../api/nltk.ccg.lexicon.html#nltk.ccg.lexicon.Token">[docs]</a><span class="k">class</span> <span class="nc">Token</span><span class="p">:</span>
<span class="sd">"""</span>
<span class="sd"> Class representing a token.</span>
<span class="sd"> token => category {semantics}</span>
<span class="sd"> e.g. eat => S\\var[pl]/var {\\x y.eat(x,y)}</span>
<span class="sd"> * `token` (string)</span>
<span class="sd"> * `categ` (string)</span>
<span class="sd"> * `semantics` (Expression)</span>
<span class="sd"> """</span>
<div class="viewcode-block" id="Token.__init__"><a class="viewcode-back" href="../../../api/nltk.ccg.lexicon.html#nltk.ccg.lexicon.Token.__init__">[docs]</a> <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">token</span><span class="p">,</span> <span class="n">categ</span><span class="p">,</span> <span class="n">semantics</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_token</span> <span class="o">=</span> <span class="n">token</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_categ</span> <span class="o">=</span> <span class="n">categ</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_semantics</span> <span class="o">=</span> <span class="n">semantics</span></div>
<div class="viewcode-block" id="Token.categ"><a class="viewcode-back" href="../../../api/nltk.ccg.lexicon.html#nltk.ccg.lexicon.Token.categ">[docs]</a> <span class="k">def</span> <span class="nf">categ</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_categ</span></div>
<div class="viewcode-block" id="Token.semantics"><a class="viewcode-back" href="../../../api/nltk.ccg.lexicon.html#nltk.ccg.lexicon.Token.semantics">[docs]</a> <span class="k">def</span> <span class="nf">semantics</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_semantics</span></div>
<span class="k">def</span> <span class="fm">__str__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="n">semantics_str</span> <span class="o">=</span> <span class="s2">""</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_semantics</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">semantics_str</span> <span class="o">=</span> <span class="s2">" {"</span> <span class="o">+</span> <span class="nb">str</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_semantics</span><span class="p">)</span> <span class="o">+</span> <span class="s2">"}"</span>
<span class="k">return</span> <span class="s2">""</span> <span class="o">+</span> <span class="nb">str</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_categ</span><span class="p">)</span> <span class="o">+</span> <span class="n">semantics_str</span>
<span class="k">def</span> <span class="nf">__cmp__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">):</span>
<span class="k">if</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">other</span><span class="p">,</span> <span class="n">Token</span><span class="p">):</span>
<span class="k">return</span> <span class="o">-</span><span class="mi">1</span>
<span class="k">return</span> <span class="n">cmp</span><span class="p">((</span><span class="bp">self</span><span class="o">.</span><span class="n">_categ</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_semantics</span><span class="p">),</span> <span class="n">other</span><span class="o">.</span><span class="n">categ</span><span class="p">(),</span> <span class="n">other</span><span class="o">.</span><span class="n">semantics</span><span class="p">())</span></div>
<div class="viewcode-block" id="CCGLexicon"><a class="viewcode-back" href="../../../api/nltk.ccg.lexicon.html#nltk.ccg.lexicon.CCGLexicon">[docs]</a><span class="k">class</span> <span class="nc">CCGLexicon</span><span class="p">:</span>
<span class="sd">"""</span>
<span class="sd"> Class representing a lexicon for CCG grammars.</span>
<span class="sd"> * `primitives`: The list of primitive categories for the lexicon</span>
<span class="sd"> * `families`: Families of categories</span>
<span class="sd"> * `entries`: A mapping of words to possible categories</span>
<span class="sd"> """</span>
<div class="viewcode-block" id="CCGLexicon.__init__"><a class="viewcode-back" href="../../../api/nltk.ccg.lexicon.html#nltk.ccg.lexicon.CCGLexicon.__init__">[docs]</a> <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">start</span><span class="p">,</span> <span class="n">primitives</span><span class="p">,</span> <span class="n">families</span><span class="p">,</span> <span class="n">entries</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_start</span> <span class="o">=</span> <span class="n">PrimitiveCategory</span><span class="p">(</span><span class="n">start</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_primitives</span> <span class="o">=</span> <span class="n">primitives</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_families</span> <span class="o">=</span> <span class="n">families</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_entries</span> <span class="o">=</span> <span class="n">entries</span></div>
<div class="viewcode-block" id="CCGLexicon.categories"><a class="viewcode-back" href="../../../api/nltk.ccg.lexicon.html#nltk.ccg.lexicon.CCGLexicon.categories">[docs]</a> <span class="k">def</span> <span class="nf">categories</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">word</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Returns all the possible categories for a word</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_entries</span><span class="p">[</span><span class="n">word</span><span class="p">]</span></div>
<div class="viewcode-block" id="CCGLexicon.start"><a class="viewcode-back" href="../../../api/nltk.ccg.lexicon.html#nltk.ccg.lexicon.CCGLexicon.start">[docs]</a> <span class="k">def</span> <span class="nf">start</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Return the target category for the parser</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_start</span></div>
<span class="k">def</span> <span class="fm">__str__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> String representation of the lexicon. Used for debugging.</span>
<span class="sd"> """</span>
<span class="n">string</span> <span class="o">=</span> <span class="s2">""</span>
<span class="n">first</span> <span class="o">=</span> <span class="kc">True</span>
<span class="k">for</span> <span class="n">ident</span> <span class="ow">in</span> <span class="nb">sorted</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_entries</span><span class="p">):</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">first</span><span class="p">:</span>
<span class="n">string</span> <span class="o">=</span> <span class="n">string</span> <span class="o">+</span> <span class="s2">"</span><span class="se">\n</span><span class="s2">"</span>
<span class="n">string</span> <span class="o">=</span> <span class="n">string</span> <span class="o">+</span> <span class="n">ident</span> <span class="o">+</span> <span class="s2">" => "</span>
<span class="n">first</span> <span class="o">=</span> <span class="kc">True</span>
<span class="k">for</span> <span class="n">cat</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">_entries</span><span class="p">[</span><span class="n">ident</span><span class="p">]:</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">first</span><span class="p">:</span>
<span class="n">string</span> <span class="o">=</span> <span class="n">string</span> <span class="o">+</span> <span class="s2">" | "</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">first</span> <span class="o">=</span> <span class="kc">False</span>
<span class="n">string</span> <span class="o">=</span> <span class="n">string</span> <span class="o">+</span> <span class="s2">"</span><span class="si">%s</span><span class="s2">"</span> <span class="o">%</span> <span class="n">cat</span>
<span class="k">return</span> <span class="n">string</span></div>
<span class="c1"># -----------</span>
<span class="c1"># Parsing lexicons</span>
<span class="c1"># -----------</span>
<div class="viewcode-block" id="matchBrackets"><a class="viewcode-back" href="../../../api/nltk.ccg.lexicon.html#nltk.ccg.lexicon.matchBrackets">[docs]</a><span class="k">def</span> <span class="nf">matchBrackets</span><span class="p">(</span><span class="n">string</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Separate the contents matching the first set of brackets from the rest of</span>
<span class="sd"> the input.</span>
<span class="sd"> """</span>
<span class="n">rest</span> <span class="o">=</span> <span class="n">string</span><span class="p">[</span><span class="mi">1</span><span class="p">:]</span>
<span class="n">inside</span> <span class="o">=</span> <span class="s2">"("</span>
<span class="k">while</span> <span class="n">rest</span> <span class="o">!=</span> <span class="s2">""</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">rest</span><span class="o">.</span><span class="n">startswith</span><span class="p">(</span><span class="s2">")"</span><span class="p">):</span>
<span class="k">if</span> <span class="n">rest</span><span class="o">.</span><span class="n">startswith</span><span class="p">(</span><span class="s2">"("</span><span class="p">):</span>
<span class="p">(</span><span class="n">part</span><span class="p">,</span> <span class="n">rest</span><span class="p">)</span> <span class="o">=</span> <span class="n">matchBrackets</span><span class="p">(</span><span class="n">rest</span><span class="p">)</span>
<span class="n">inside</span> <span class="o">=</span> <span class="n">inside</span> <span class="o">+</span> <span class="n">part</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">inside</span> <span class="o">=</span> <span class="n">inside</span> <span class="o">+</span> <span class="n">rest</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
<span class="n">rest</span> <span class="o">=</span> <span class="n">rest</span><span class="p">[</span><span class="mi">1</span><span class="p">:]</span>
<span class="k">if</span> <span class="n">rest</span><span class="o">.</span><span class="n">startswith</span><span class="p">(</span><span class="s2">")"</span><span class="p">):</span>
<span class="k">return</span> <span class="p">(</span><span class="n">inside</span> <span class="o">+</span> <span class="s2">")"</span><span class="p">,</span> <span class="n">rest</span><span class="p">[</span><span class="mi">1</span><span class="p">:])</span>
<span class="k">raise</span> <span class="ne">AssertionError</span><span class="p">(</span><span class="s2">"Unmatched bracket in string '"</span> <span class="o">+</span> <span class="n">string</span> <span class="o">+</span> <span class="s2">"'"</span><span class="p">)</span></div>
<div class="viewcode-block" id="nextCategory"><a class="viewcode-back" href="../../../api/nltk.ccg.lexicon.html#nltk.ccg.lexicon.nextCategory">[docs]</a><span class="k">def</span> <span class="nf">nextCategory</span><span class="p">(</span><span class="n">string</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Separate the string for the next portion of the category from the rest</span>
<span class="sd"> of the string</span>
<span class="sd"> """</span>
<span class="k">if</span> <span class="n">string</span><span class="o">.</span><span class="n">startswith</span><span class="p">(</span><span class="s2">"("</span><span class="p">):</span>
<span class="k">return</span> <span class="n">matchBrackets</span><span class="p">(</span><span class="n">string</span><span class="p">)</span>
<span class="k">return</span> <span class="n">NEXTPRIM_RE</span><span class="o">.</span><span class="n">match</span><span class="p">(</span><span class="n">string</span><span class="p">)</span><span class="o">.</span><span class="n">groups</span><span class="p">()</span></div>
<div class="viewcode-block" id="parseApplication"><a class="viewcode-back" href="../../../api/nltk.ccg.lexicon.html#nltk.ccg.lexicon.parseApplication">[docs]</a><span class="k">def</span> <span class="nf">parseApplication</span><span class="p">(</span><span class="n">app</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Parse an application operator</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="n">Direction</span><span class="p">(</span><span class="n">app</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="n">app</span><span class="p">[</span><span class="mi">1</span><span class="p">:])</span></div>
<div class="viewcode-block" id="parseSubscripts"><a class="viewcode-back" href="../../../api/nltk.ccg.lexicon.html#nltk.ccg.lexicon.parseSubscripts">[docs]</a><span class="k">def</span> <span class="nf">parseSubscripts</span><span class="p">(</span><span class="n">subscr</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Parse the subscripts for a primitive category</span>
<span class="sd"> """</span>
<span class="k">if</span> <span class="n">subscr</span><span class="p">:</span>
<span class="k">return</span> <span class="n">subscr</span><span class="p">[</span><span class="mi">1</span><span class="p">:</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s2">","</span><span class="p">)</span>
<span class="k">return</span> <span class="p">[]</span></div>
<div class="viewcode-block" id="parsePrimitiveCategory"><a class="viewcode-back" href="../../../api/nltk.ccg.lexicon.html#nltk.ccg.lexicon.parsePrimitiveCategory">[docs]</a><span class="k">def</span> <span class="nf">parsePrimitiveCategory</span><span class="p">(</span><span class="n">chunks</span><span class="p">,</span> <span class="n">primitives</span><span class="p">,</span> <span class="n">families</span><span class="p">,</span> <span class="n">var</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Parse a primitive category</span>
<span class="sd"> If the primitive is the special category 'var', replace it with the</span>
<span class="sd"> correct `CCGVar`.</span>
<span class="sd"> """</span>
<span class="k">if</span> <span class="n">chunks</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">==</span> <span class="s2">"var"</span><span class="p">:</span>
<span class="k">if</span> <span class="n">chunks</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">if</span> <span class="n">var</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">var</span> <span class="o">=</span> <span class="n">CCGVar</span><span class="p">()</span>
<span class="k">return</span> <span class="p">(</span><span class="n">var</span><span class="p">,</span> <span class="n">var</span><span class="p">)</span>
<span class="n">catstr</span> <span class="o">=</span> <span class="n">chunks</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
<span class="k">if</span> <span class="n">catstr</span> <span class="ow">in</span> <span class="n">families</span><span class="p">:</span>
<span class="p">(</span><span class="n">cat</span><span class="p">,</span> <span class="n">cvar</span><span class="p">)</span> <span class="o">=</span> <span class="n">families</span><span class="p">[</span><span class="n">catstr</span><span class="p">]</span>
<span class="k">if</span> <span class="n">var</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">var</span> <span class="o">=</span> <span class="n">cvar</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">cat</span> <span class="o">=</span> <span class="n">cat</span><span class="o">.</span><span class="n">substitute</span><span class="p">([(</span><span class="n">cvar</span><span class="p">,</span> <span class="n">var</span><span class="p">)])</span>
<span class="k">return</span> <span class="p">(</span><span class="n">cat</span><span class="p">,</span> <span class="n">var</span><span class="p">)</span>
<span class="k">if</span> <span class="n">catstr</span> <span class="ow">in</span> <span class="n">primitives</span><span class="p">:</span>
<span class="n">subscrs</span> <span class="o">=</span> <span class="n">parseSubscripts</span><span class="p">(</span><span class="n">chunks</span><span class="p">[</span><span class="mi">1</span><span class="p">])</span>
<span class="k">return</span> <span class="p">(</span><span class="n">PrimitiveCategory</span><span class="p">(</span><span class="n">catstr</span><span class="p">,</span> <span class="n">subscrs</span><span class="p">),</span> <span class="n">var</span><span class="p">)</span>
<span class="k">raise</span> <span class="ne">AssertionError</span><span class="p">(</span>
<span class="s2">"String '"</span> <span class="o">+</span> <span class="n">catstr</span> <span class="o">+</span> <span class="s2">"' is neither a family nor primitive category."</span>
<span class="p">)</span></div>
<div class="viewcode-block" id="augParseCategory"><a class="viewcode-back" href="../../../api/nltk.ccg.lexicon.html#nltk.ccg.lexicon.augParseCategory">[docs]</a><span class="k">def</span> <span class="nf">augParseCategory</span><span class="p">(</span><span class="n">line</span><span class="p">,</span> <span class="n">primitives</span><span class="p">,</span> <span class="n">families</span><span class="p">,</span> <span class="n">var</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Parse a string representing a category, and returns a tuple with</span>
<span class="sd"> (possibly) the CCG variable for the category</span>
<span class="sd"> """</span>
<span class="p">(</span><span class="n">cat_string</span><span class="p">,</span> <span class="n">rest</span><span class="p">)</span> <span class="o">=</span> <span class="n">nextCategory</span><span class="p">(</span><span class="n">line</span><span class="p">)</span>
<span class="k">if</span> <span class="n">cat_string</span><span class="o">.</span><span class="n">startswith</span><span class="p">(</span><span class="s2">"("</span><span class="p">):</span>
<span class="p">(</span><span class="n">res</span><span class="p">,</span> <span class="n">var</span><span class="p">)</span> <span class="o">=</span> <span class="n">augParseCategory</span><span class="p">(</span><span class="n">cat_string</span><span class="p">[</span><span class="mi">1</span><span class="p">:</span><span class="o">-</span><span class="mi">1</span><span class="p">],</span> <span class="n">primitives</span><span class="p">,</span> <span class="n">families</span><span class="p">,</span> <span class="n">var</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="p">(</span><span class="n">res</span><span class="p">,</span> <span class="n">var</span><span class="p">)</span> <span class="o">=</span> <span class="n">parsePrimitiveCategory</span><span class="p">(</span>
<span class="n">PRIM_RE</span><span class="o">.</span><span class="n">match</span><span class="p">(</span><span class="n">cat_string</span><span class="p">)</span><span class="o">.</span><span class="n">groups</span><span class="p">(),</span> <span class="n">primitives</span><span class="p">,</span> <span class="n">families</span><span class="p">,</span> <span class="n">var</span>
<span class="p">)</span>
<span class="k">while</span> <span class="n">rest</span> <span class="o">!=</span> <span class="s2">""</span><span class="p">:</span>
<span class="n">app</span> <span class="o">=</span> <span class="n">APP_RE</span><span class="o">.</span><span class="n">match</span><span class="p">(</span><span class="n">rest</span><span class="p">)</span><span class="o">.</span><span class="n">groups</span><span class="p">()</span>
<span class="n">direction</span> <span class="o">=</span> <span class="n">parseApplication</span><span class="p">(</span><span class="n">app</span><span class="p">[</span><span class="mi">0</span><span class="p">:</span><span class="mi">3</span><span class="p">])</span>
<span class="n">rest</span> <span class="o">=</span> <span class="n">app</span><span class="p">[</span><span class="mi">3</span><span class="p">]</span>
<span class="p">(</span><span class="n">cat_string</span><span class="p">,</span> <span class="n">rest</span><span class="p">)</span> <span class="o">=</span> <span class="n">nextCategory</span><span class="p">(</span><span class="n">rest</span><span class="p">)</span>
<span class="k">if</span> <span class="n">cat_string</span><span class="o">.</span><span class="n">startswith</span><span class="p">(</span><span class="s2">"("</span><span class="p">):</span>
<span class="p">(</span><span class="n">arg</span><span class="p">,</span> <span class="n">var</span><span class="p">)</span> <span class="o">=</span> <span class="n">augParseCategory</span><span class="p">(</span><span class="n">cat_string</span><span class="p">[</span><span class="mi">1</span><span class="p">:</span><span class="o">-</span><span class="mi">1</span><span class="p">],</span> <span class="n">primitives</span><span class="p">,</span> <span class="n">families</span><span class="p">,</span> <span class="n">var</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="p">(</span><span class="n">arg</span><span class="p">,</span> <span class="n">var</span><span class="p">)</span> <span class="o">=</span> <span class="n">parsePrimitiveCategory</span><span class="p">(</span>
<span class="n">PRIM_RE</span><span class="o">.</span><span class="n">match</span><span class="p">(</span><span class="n">cat_string</span><span class="p">)</span><span class="o">.</span><span class="n">groups</span><span class="p">(),</span> <span class="n">primitives</span><span class="p">,</span> <span class="n">families</span><span class="p">,</span> <span class="n">var</span>
<span class="p">)</span>
<span class="n">res</span> <span class="o">=</span> <span class="n">FunctionalCategory</span><span class="p">(</span><span class="n">res</span><span class="p">,</span> <span class="n">arg</span><span class="p">,</span> <span class="n">direction</span><span class="p">)</span>
<span class="k">return</span> <span class="p">(</span><span class="n">res</span><span class="p">,</span> <span class="n">var</span><span class="p">)</span></div>
<div class="viewcode-block" id="fromstring"><a class="viewcode-back" href="../../../api/nltk.ccg.lexicon.html#nltk.ccg.lexicon.fromstring">[docs]</a><span class="k">def</span> <span class="nf">fromstring</span><span class="p">(</span><span class="n">lex_str</span><span class="p">,</span> <span class="n">include_semantics</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Convert string representation into a lexicon for CCGs.</span>
<span class="sd"> """</span>
<span class="n">CCGVar</span><span class="o">.</span><span class="n">reset_id</span><span class="p">()</span>
<span class="n">primitives</span> <span class="o">=</span> <span class="p">[]</span>
<span class="n">families</span> <span class="o">=</span> <span class="p">{}</span>
<span class="n">entries</span> <span class="o">=</span> <span class="n">defaultdict</span><span class="p">(</span><span class="nb">list</span><span class="p">)</span>
<span class="k">for</span> <span class="n">line</span> <span class="ow">in</span> <span class="n">lex_str</span><span class="o">.</span><span class="n">splitlines</span><span class="p">():</span>
<span class="c1"># Strip comments and leading/trailing whitespace.</span>
<span class="n">line</span> <span class="o">=</span> <span class="n">COMMENTS_RE</span><span class="o">.</span><span class="n">match</span><span class="p">(</span><span class="n">line</span><span class="p">)</span><span class="o">.</span><span class="n">groups</span><span class="p">()[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">strip</span><span class="p">()</span>
<span class="k">if</span> <span class="n">line</span> <span class="o">==</span> <span class="s2">""</span><span class="p">:</span>
<span class="k">continue</span>
<span class="k">if</span> <span class="n">line</span><span class="o">.</span><span class="n">startswith</span><span class="p">(</span><span class="s2">":-"</span><span class="p">):</span>
<span class="c1"># A line of primitive categories.</span>
<span class="c1"># The first one is the target category</span>
<span class="c1"># ie, :- S, N, NP, VP</span>
<span class="n">primitives</span> <span class="o">=</span> <span class="n">primitives</span> <span class="o">+</span> <span class="p">[</span>
<span class="n">prim</span><span class="o">.</span><span class="n">strip</span><span class="p">()</span> <span class="k">for</span> <span class="n">prim</span> <span class="ow">in</span> <span class="n">line</span><span class="p">[</span><span class="mi">2</span><span class="p">:]</span><span class="o">.</span><span class="n">strip</span><span class="p">()</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s2">","</span><span class="p">)</span>
<span class="p">]</span>
<span class="k">else</span><span class="p">:</span>
<span class="c1"># Either a family definition, or a word definition</span>
<span class="p">(</span><span class="n">ident</span><span class="p">,</span> <span class="n">sep</span><span class="p">,</span> <span class="n">rhs</span><span class="p">)</span> <span class="o">=</span> <span class="n">LEX_RE</span><span class="o">.</span><span class="n">match</span><span class="p">(</span><span class="n">line</span><span class="p">)</span><span class="o">.</span><span class="n">groups</span><span class="p">()</span>
<span class="p">(</span><span class="n">catstr</span><span class="p">,</span> <span class="n">semantics_str</span><span class="p">)</span> <span class="o">=</span> <span class="n">RHS_RE</span><span class="o">.</span><span class="n">match</span><span class="p">(</span><span class="n">rhs</span><span class="p">)</span><span class="o">.</span><span class="n">groups</span><span class="p">()</span>
<span class="p">(</span><span class="n">cat</span><span class="p">,</span> <span class="n">var</span><span class="p">)</span> <span class="o">=</span> <span class="n">augParseCategory</span><span class="p">(</span><span class="n">catstr</span><span class="p">,</span> <span class="n">primitives</span><span class="p">,</span> <span class="n">families</span><span class="p">)</span>
<span class="k">if</span> <span class="n">sep</span> <span class="o">==</span> <span class="s2">"::"</span><span class="p">:</span>
<span class="c1"># Family definition</span>
<span class="c1"># ie, Det :: NP/N</span>
<span class="n">families</span><span class="p">[</span><span class="n">ident</span><span class="p">]</span> <span class="o">=</span> <span class="p">(</span><span class="n">cat</span><span class="p">,</span> <span class="n">var</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">semantics</span> <span class="o">=</span> <span class="kc">None</span>
<span class="k">if</span> <span class="n">include_semantics</span> <span class="ow">is</span> <span class="kc">True</span><span class="p">:</span>
<span class="k">if</span> <span class="n">semantics_str</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">AssertionError</span><span class="p">(</span>
<span class="n">line</span>
<span class="o">+</span> <span class="s2">" must contain semantics because include_semantics is set to True"</span>
<span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">semantics</span> <span class="o">=</span> <span class="n">Expression</span><span class="o">.</span><span class="n">fromstring</span><span class="p">(</span>
<span class="n">SEMANTICS_RE</span><span class="o">.</span><span class="n">match</span><span class="p">(</span><span class="n">semantics_str</span><span class="p">)</span><span class="o">.</span><span class="n">groups</span><span class="p">()[</span><span class="mi">0</span><span class="p">]</span>
<span class="p">)</span>
<span class="c1"># Word definition</span>
<span class="c1"># ie, which => (N\N)/(S/NP)</span>
<span class="n">entries</span><span class="p">[</span><span class="n">ident</span><span class="p">]</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">Token</span><span class="p">(</span><span class="n">ident</span><span class="p">,</span> <span class="n">cat</span><span class="p">,</span> <span class="n">semantics</span><span class="p">))</span>
<span class="k">return</span> <span class="n">CCGLexicon</span><span class="p">(</span><span class="n">primitives</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="n">primitives</span><span class="p">,</span> <span class="n">families</span><span class="p">,</span> <span class="n">entries</span><span class="p">)</span></div>
<span class="nd">@deprecated</span><span class="p">(</span><span class="s2">"Use fromstring() instead."</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">parseLexicon</span><span class="p">(</span><span class="n">lex_str</span><span class="p">):</span>
<span class="k">return</span> <span class="n">fromstring</span><span class="p">(</span><span class="n">lex_str</span><span class="p">)</span>
<span class="n">openccg_tinytiny</span> <span class="o">=</span> <span class="n">fromstring</span><span class="p">(</span>
<span class="sd">"""</span>
<span class="sd"> # Rather minimal lexicon based on the openccg `tinytiny' grammar.</span>
<span class="sd"> # Only incorporates a subset of the morphological subcategories, however.</span>
<span class="sd"> :- S,NP,N # Primitive categories</span>
<span class="sd"> Det :: NP/N # Determiners</span>
<span class="sd"> Pro :: NP</span>
<span class="sd"> IntransVsg :: S\\NP[sg] # Tensed intransitive verbs (singular)</span>
<span class="sd"> IntransVpl :: S\\NP[pl] # Plural</span>
<span class="sd"> TransVsg :: S\\NP[sg]/NP # Tensed transitive verbs (singular)</span>
<span class="sd"> TransVpl :: S\\NP[pl]/NP # Plural</span>
<span class="sd"> the => NP[sg]/N[sg]</span>
<span class="sd"> the => NP[pl]/N[pl]</span>
<span class="sd"> I => Pro</span>
<span class="sd"> me => Pro</span>
<span class="sd"> we => Pro</span>
<span class="sd"> us => Pro</span>
<span class="sd"> book => N[sg]</span>
<span class="sd"> books => N[pl]</span>
<span class="sd"> peach => N[sg]</span>
<span class="sd"> peaches => N[pl]</span>
<span class="sd"> policeman => N[sg]</span>
<span class="sd"> policemen => N[pl]</span>
<span class="sd"> boy => N[sg]</span>
<span class="sd"> boys => N[pl]</span>
<span class="sd"> sleep => IntransVsg</span>
<span class="sd"> sleep => IntransVpl</span>
<span class="sd"> eat => IntransVpl</span>
<span class="sd"> eat => TransVpl</span>
<span class="sd"> eats => IntransVsg</span>
<span class="sd"> eats => TransVsg</span>
<span class="sd"> see => TransVpl</span>
<span class="sd"> sees => TransVsg</span>
<span class="sd"> """</span>
<span class="p">)</span>
</pre></div>
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