src/wrappers/PhyxWrapper.js
const fs = require('fs');
const path = require('path');
/** Helper methods from lodash. */
const { has, cloneDeep, uniq } = require('lodash');
/** For NQuads export. */
const JSONLD = require('jsonld');
const owlterms = require('../utils/owlterms');
const { PhylorefWrapper } = require('./PhylorefWrapper');
const { PhylogenyWrapper } = require('./PhylogenyWrapper');
const { CitationWrapper } = require('./CitationWrapper');
/**
* The PhyxWrapper wraps an entire Phyx document.
*/
class PhyxWrapper {
/**
* Wraps an entire PHYX document.
* @param {Object} phyx - The Phyx structure to wrap.
* @param {function(newick: string): {name: string, children: Object[]}}
* [newickParser=PhylogenyWrapper.getParsedNewick] - A method
* that accepts a Newick string and returns a list of nodes. Each node should have a
* 'children' key with its children and optionally a 'name' key with its label. This
* code previously depended on phylotree.js, whose newick_parser() function works exactly
* like this. This option allows you to drop in Phylotree's newick_parser() or -- if you
* prefer -- any other option.
*/
constructor(phyx, newickParser = PhylogenyWrapper.getParsedNewick) {
//
this.phyx = phyx;
this.newickParser = newickParser;
}
// Determine a 'default nomenclatural code' for this Phyx file. There are
// two ways to do this:
// 1. If the Phyx file has a 'defaultNomenclaturalCodeIRI' property, we use that.
// 2. Otherwise, we check to see if every phyloref in this file has the same
// nomenclatural code. If so, we can use that code. If not, i.e. if any of
// the phylorefs are missing a nomenclatural code or include a specifier,
// we default to owlterms.UNKNOWN_CODE.
get defaultNomenCode() {
if (has(this.phyx, 'defaultNomenclaturalCodeIRI')) return this.phyx.defaultNomenclaturalCodeIRI;
const nomenCodes = (this.phyx.phylorefs || [])
.map(phyloref => new PhylorefWrapper(phyloref).defaultNomenCode);
const uniqNomenCodes = uniq(nomenCodes);
if (uniqNomenCodes.length === 1) return uniqNomenCodes[0];
return owlterms.UNKNOWN_CODE;
}
/**
* Generate an executable ontology from this Phyx document. The document is mostly in JSON-LD
* already, except for three important things:
* 1. We have to convert all phylogenies into a series of statements relating to the nodes
* inside these phylogenies.
* 2. We have to convert phylogenies into OWL restrictions.
* 3. Insert all matches between taxonomic units in this file.
*
* @param {string} [baseIRI=""] - The base IRI to use when generating this Phyx document.
* This should include a trailing '#' or '/'. Use '' to indicate that relative IDs
* should be generated in the produced ontology (e.g. '#phylogeny1'). Note that if a
* baseIRI is provided, then relative IDs already in the Phyx file (identified by an
* initial '#') will be turned into absolute IDs by removing the initial `#` and
* prepending them with the baseIRI.
* @return {Object} This Phyx document as an OWL ontology as a JSON-LD object.
*/
asJSONLD(baseIRI = '') {
const jsonld = cloneDeep(this.phyx);
// Some helper methods for generating base IRIs for phylorefs and phylogenies.
function getBaseIRIForPhyloref(index) {
if (baseIRI) return `${baseIRI}phyloref${index}`;
return `#phyloref${index}`;
}
function getBaseIRIForPhylogeny(index) {
if (baseIRI) return `${baseIRI}phylogeny${index}`;
return `#phylogeny${index}`;
}
// Given a relative ID (e.g. '#phylo1') make it absolute (`${baseIRI}phylo1`).
function makeIDAbsolute(phylogenyId) {
if (baseIRI && phylogenyId.startsWith('#')) return `${baseIRI}${phylogenyId.substring(1)}`; // Remove the initial '#'.
return phylogenyId;
}
// Given an absolute ID (`${baseIRI}phylo1`) make it relative (e.g. '#phylo1').
function makeIDRelative(phylogenyId) {
if (phylogenyId.startsWith(baseIRI)) return `#${phylogenyId.substring(baseIRI.length)}`;
return phylogenyId;
}
if (has(jsonld, 'phylorefs')) {
// We might have phyloref IDs set to relative IRIs (e.g. "#phyloref0").
// If the baseIRI is set to '', that's fine. But if not, we'll add it
// to the relative IRI to make it absolute. This seems to avoid problems
// with some JSON-LD parsers.
if (baseIRI) {
jsonld.phylorefs = jsonld.phylorefs.map((phyloref) => {
if ((phyloref['@id'] || '').startsWith('#')) {
const modifiedPhyloref = cloneDeep(phyloref);
modifiedPhyloref['@id'] = makeIDAbsolute(phyloref['@id']);
return modifiedPhyloref;
}
return phyloref;
});
}
// Convert phyloreferences into an OWL class restriction
jsonld.phylorefs = jsonld.phylorefs.map(
(phyloref, countPhyloref) => new PhylorefWrapper(phyloref, this.defaultNomenCode)
.asJSONLD(getBaseIRIForPhyloref(countPhyloref))
);
}
if (has(jsonld, 'phylogenies')) {
// We might have phyloref IDs set to relative IRIs (e.g. "#phyloref0").
// If the baseIRI is set to '', that's fine. But if not, we'll add it
// to the relative IRI to make it absolute. This seems to avoid problems
// with some JSON-LD parsers.
if (baseIRI) {
jsonld.phylogenies = jsonld.phylogenies.map((phylogeny) => {
if ((phylogeny['@id'] || '').startsWith('#')) {
const modifiedPhylogeny = cloneDeep(phylogeny);
modifiedPhylogeny['@id'] = makeIDAbsolute(phylogeny['@id']);
return modifiedPhylogeny;
}
return phylogeny;
});
}
// Add descriptions for individual nodes in each phylogeny.
jsonld.phylogenies = jsonld.phylogenies.map(
(phylogeny, countPhylogeny) => new PhylogenyWrapper(phylogeny, this.defaultNomenCode)
.asJSONLD(getBaseIRIForPhylogeny(countPhylogeny), this.newickParser)
);
// Go through all the nodes and add information on expected resolution.
jsonld.phylogenies.forEach((phylogeny) => {
const phylogenyId = phylogeny['@id'];
(phylogeny.nodes || []).forEach((node) => {
// We can't set expected resolution information on unlabeled nodes.
if (!node.labels) return;
jsonld.phylorefs.forEach((phyloref) => {
const phylorefId = phyloref['@id'];
// There are two ways in which we determine that a phyloreference
// is expected to resolve to a node:
// (1) If nodeLabel is set, then that must be one of the node's labels.
// (2) If nodeLabel is not set, then one of the node's label should be
// identical to the phyloreference's label.
//
// We set flagNodeExpectsPhyloref in all cases where we should note
// that this node expects to resolve to this phyloreference.
let flagNodeExpectsPhyloref = false;
// console.log(`Testing expected resolution of '${phylorefId}' on `
// + `'${phylogenyId}' (${makeIDRelative(phylogenyId)}).`);
if (
has(phyloref, 'expectedResolution')
&& (
// The user might have used the absolute phylogeny ID here.
has(phyloref.expectedResolution, phylogenyId)
// Or they might have used a relative phylogeny ID.
|| has(phyloref.expectedResolution, makeIDRelative(phylogenyId))
)
) {
// Expected resolution information set! The node label mentioned in that
// information must be identical to one of the labels of this phylogeny node.
// Figure out which phylogenyId was matched here.
const nodeLabel = has(phyloref.expectedResolution, phylogenyId)
? phyloref.expectedResolution[phylogenyId].nodeLabel
: phyloref.expectedResolution[makeIDRelative(phylogenyId)].nodeLabel;
if (nodeLabel && (node.labels || []).includes(nodeLabel)) {
flagNodeExpectsPhyloref = true;
}
} else if ((node.labels || []).includes(phyloref.label)) {
// No expected resolution information, so we just check whether
// the phyloref label is one of the labels on this phylogeny node.
flagNodeExpectsPhyloref = true;
}
if (flagNodeExpectsPhyloref) {
// Modify this phylogeny node's type to include that it is a type
// of:
// obi:is_specified_output_of some (
// obi:Prediction and obi:has_specified_output some #phyloref_id
// )
node[owlterms.RDF_TYPE].push({
'@type': owlterms.OWL_RESTRICTION,
onProperty: owlterms.OBI_IS_SPECIFIED_OUTPUT_OF,
someValuesFrom: {
'@type': owlterms.OWL_CLASS,
intersectionOf: [
{ '@id': owlterms.OBI_PREDICTION },
{
'@type': owlterms.OWL_RESTRICTION,
onProperty: owlterms.OBI_HAS_SPECIFIED_INPUT,
someValuesFrom: {
'@id': phylorefId,
},
},
],
},
});
}
});
});
});
}
// Earlier, we used to generate a list of taxonomic matches here (stored in
// jsonld.hasTaxonomicUnitMatches) that logically expressed how taxonomic
// units in phyloref specifiers were related to taxonomic units in phylogeny
// nodes. This is no longer necessary, since phyloref specifiers are now logical
// expressions that directly evaluate to phylogeny nodes. However, if in the
// future we decide that we need to perform more advanced TU matching, this
// would be the place to implement that.
// If there is a top-level source, generate a bibliographicCitation for it.
if (has(jsonld, 'source')) {
jsonld.source.bibliographicCitation = new CitationWrapper(jsonld.source).toString();
}
// Set up the top-level object '@type'. If one is present, we add our terms to that.
if (!has(jsonld, '@type')) jsonld['@type'] = [];
if (!Array.isArray(jsonld['@type'])) jsonld['@type'] = [jsonld['@type']];
jsonld['@type'].push('owl:Ontology');
// Set up the ontology imports. If one is present, we add our imports to that.
if (!has(jsonld, 'owl:imports')) jsonld['owl:imports'] = [];
if (!Array.isArray(jsonld['owl:imports'])) jsonld['owl:imports'] = [jsonld['owl:imports']];
jsonld['owl:imports'].push('http://ontology.phyloref.org/2018-12-14/phyloref.owl');
jsonld['owl:imports'].push('http://ontology.phyloref.org/2018-12-14/tcan.owl');
// If the '@context' is missing, add it here.
if (!has(jsonld, '@context')) {
jsonld['@context'] = owlterms.PHYX_CONTEXT_JSON;
}
return jsonld;
}
/**
* Generate an executable ontology from this Phyx document as N-Quads. Under the
* hood, we generate an OWL/JSON-LD representation of this Phyx document, and then
* convert it into N-Quads so that OWLAPI-supporting tools can directly consume it.
*
* @param {string} [baseIRI=""] - The base IRI to use when generating this Phyx document.
* This should include a trailing '#' or '/'. Use '' to indicate that relative IDs
* should be generated in the produced ontology (e.g. '#phylogeny1'). Note that if a
* baseIRI is provided, then relative IDs already in the Phyx file (identified by an
* initial '#') will be turned into absolute IDs by removing the initial `#` and
* prepending them with the baseIRI.
* @param {string} [filePath=undefined] - The path of the Phyx file being converted.
* Used only if the `@context` of the file is a relative path.
* @return {Promise[string]} A Promise to return this Phyx document as a string that can
* be written to an N-Quads file.
*/
toRDF(baseIRI = '', filePath = undefined) {
const owlJSONLD = this.asJSONLD(baseIRI);
// For the purposes of testing, we are sometimes given a relative path to `@context`,
// but the JSONLD package does not support this. Instead, we'll import the contents
// of the relative path on the fly.
if (filePath && has(owlJSONLD, '@context') && owlJSONLD['@context'].startsWith('.')) {
owlJSONLD['@context'] = JSON.parse(fs.readFileSync(
path.resolve(filePath, owlJSONLD['@context'])
));
}
return JSONLD.toRDF(owlJSONLD, { format: 'application/n-quads' });
}
}
module.exports = {
PhyxWrapper,
};
