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index.js
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index.js
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const Sql = require('sql-extra');
const parse = require('csv-parse');
const lunr = require('lunr');
const path = require('path');
const fs = require('fs');
const TEXTCOL = new Set(['code', 'name', 'scie', 'lang', 'grup', 'tags']);
var corpus = new Map();
var index = null;
var ready = null;
function tsvector(tab, cols) {
return `setweight(to_tsvector('english', "code"), '${cols.code||'A'}')||`+
`setweight(to_tsvector('english', "name"), '${cols.name||'B'}')||`+
`setweight(to_tsvector('english', "scie"), '${cols.scie||'B'}')||`+
`setweight(to_tsvector('english', ${tab}_lang_tags("lang")), '${cols.lang||'B'}')||`+
`setweight(to_tsvector('english', "grup"), '${cols.grup||'C'}')||`+
`setweight(to_tsvector('english', "tags"), '${cols.tags||'C'}')`;
};
function createFunctionLangTags(tab) {
return `CREATE OR REPLACE FUNCTION "${tab}_lang_tags" (TEXT) RETURNS TEXT AS $$`+
` SELECT lower(regexp_replace(regexp_replace(regexp_replace($1, `+
` '\\[.*?\\]', '', 'g'), '\\w+\\.\\s([\\w\\'',\\/\\(\\)\\- ]+)[;\\.]?', '\\1', 'g'),`+
` '[,\\/\\(\\)\\- ]+', ' ', 'g')) $$`+
` LANGUAGE SQL IMMUTABLE RETURNS NULL ON NULL INPUT;\n`;
};
function createTable(tab, cols, opt={}, z='') {
var don = ['code', 'name', 'scie', 'lang', 'grup', 'tags'];
z += `CREATE TABLE IF NOT EXISTS "${tab}" (`;
for(var col of don) {
var typ = 'TEXT';
z += ` "${col}" ${typ} NOT NULL,`;
}
for(var k in cols) {
if(don.includes(k)) continue;
z += ` "${k}" REAL NOT NULL,`;
}
if(opt.pk) z += ` PRIMARY KEY ("code"), `;
z = z.endsWith(', ')? z.substring(0, z.length-2):z;
z += `);\n`;
return z;
};
function insertIntoBegin(tab, cols, z='') {
z += `INSERT INTO "${tab}" (`;
for(var col in cols)
z += `"${col}", `;
z = z.endsWith(', ')? z.substring(0, z.length-2):z;
z += ') VALUES\n(';
return z;
};
function insertIntoMid(val, z='') {
for(var k in val)
z += `'${val[k]}', `;
z = z.endsWith(', ')? z.substring(0, z.length-2):z;
z += `),\n(`;
return z;
};
function insertIntoEnd(z='') {
z = z.endsWith(',\n(')? z.substring(0, z.length-3):z;
z += ';\n';
return z;
};
function csv() {
return path.join(__dirname, 'index.csv');
};
function sql(tab='compositions', opt={}) {
var i = -1, cols = null, z = '';
var opt = Object.assign({pk: 'code', index: true}, opt);
var tsv = tsvector(tab, {code: 'A', name: 'B', scie: 'B', lang: 'B', grup: 'C', tags: 'C'});
var stream = fs.createReadStream(csv()).pipe(parse({columns: true, comment: '#'}));
return new Promise((fres, frej) => {
stream.on('error', frej);
stream.on('data', (r) => {
if(++i===0) { cols = r; z = createTable(tab, cols, opt, z); z = insertIntoBegin(tab, cols, z); }
z = insertIntoMid(r, z);
});
stream.on('end', () => {
z = insertIntoEnd(z);
z += createFunctionLangTags(tab);
z += Sql.createView(`${tab}_tsvector`, `SELECT *, ${tsv} AS "tsvector" FROM "${tab}"`);
z += Sql.createIndex(`${tab}_tsvector_idx`, tab, `(${tsv})`, {method: 'GIN'});
z = Sql.setupTable.index(tab, cols, opt, z);
fres(z);
});
});
};
function loadRow(row) {
var z = {};
for(var k in row) {
if(TEXTCOL.has(k)) z[k] = row[k];
else z[k] = parseFloat(row[k]);
}
return z;
};
function loadCorpus() {
return new Promise((fres) => {
var stream = fs.createReadStream(csv()).pipe(parse({columns: true, comment: '#'}));
stream.on('data', (r) => corpus.set(r.code, loadRow(r)));
stream.on('end', fres);
});
};
function setupIndex() {
index = lunr(function() {
this.ref('code');
this.field('code');
this.field('name');
this.field('scie');
this.field('lang');
this.field('grup');
this.field('tags');
for(var r of corpus.values()) {
var {code, name, scie, lang, grup, tags} = r;
name = name.replace(/^(\w+),/g, '$1 $1 $1 $1,');
lang = lang.replace(/\[.*?\]/g, '');
lang = lang.replace(/\w+\.\s([\w\',\/\(\)\- ]+)[;\.]?/g, '$1');
lang = lang.replace(/[,\/\(\)\- ]+/g, ' ');
this.add({code, name, scie, lang, grup, tags});
}
});
};
function load() {
ready = ready||loadCorpus();
return ready.then(setupIndex);
};
function compositions(txt) {
if(index==null) return [];
var z = [], txt = txt.replace(/\W/g, ' ');
var mats = index.search(txt), max = 0;
for(var mat of mats)
max = Math.max(max, Object.keys(mat.matchData.metadata).length);
for(var mat of mats)
if(Object.keys(mat.matchData.metadata).length===max) z.push(corpus.get(mat.ref));
return z;
};
compositions.csv = csv;
compositions.sql = sql;
compositions.load = load;
compositions.corpus = corpus;
module.exports = compositions;