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support for random sequences

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Scritches 2018-04-18 00:50:22 -04:00
parent b415ee086f
commit f7b83e98b7
1 changed files with 36 additions and 6 deletions
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42
modules/oeis/oeis.js
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@ -74,6 +74,28 @@ var OEIS = function(dbot) {
if(!body.results) throw 'no-results';
return this.internalAPI.parseResult(body.results[0]);
},
'getRandomSequenceA': async set => {
// This feature uses OEIS's 'webcam' which serves up random entries
// each time the page is refreshed. It appears to be the only way to get
// valid random entries from the database. The alternative is to just generate
// random A-numbers from the set of all A-numbers, but that seems dirty to me.
var body = await rp({
url: this.webRoot + '/webcam',
qs: {
fromjavascript: 1,
q: 'keyword:' + set
}
});
// Find where the A-number is located
var i = body.indexOf('<a href="/A');
if (i < 0) throw 'no-results';
i += 11;
var a = body.slice(i, i + 6);
return a;
}
};
@ -84,16 +106,24 @@ var OEIS = function(dbot) {
try {
if (event.input[1]) {
// digit sequence
var terms = event.params.slice(1);
let terms = event.params.slice(1);
result = await this.api.lookupSequenceByExample(terms, true);
} else if (event.input[2]) {
// A-number
var a = event.input[2];
let a = event.input[2];
result = await this.api.lookupSequenceByA(a);
} else {
// Keyword search
var keywords = event.params.slice(1).join(' ');
result = await this.api.lookupSequenceByKeywords(keywords);
// Keyword search or random request
if(event.input[3] == 'sequence') {
// Random request
let a = await this.api.getRandomSequenceA('nice');
console.log(a);
result = await this.api.lookupSequenceByA(a);
} else {
// Keyword search
let keywords = event.params.slice(1).join(' ');
result = await this.api.lookupSequenceByKeywords(keywords);
}
}
}
catch(e) {
@ -108,7 +138,7 @@ var OEIS = function(dbot) {
}
}
this.commands['~sequence'].regex = [/^sequence ((?:-?\d\s?)+)|A((?:\d)+)|([\D\s]*)$/i, 4];
this.commands['~sequence'].regex = [/^sequence ((?:-?\d\s?)+)|A(\d+)|([\D\s]*)$/i, 4];
}
exports.fetch = dbot => new OEIS(dbot);