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make acceptedLanguages order the header by q values descending #262

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make acceptedLanguages order the header by q values descending #262

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9458970
make acceptedLanguages order the header by q values
blushingpenguin Jul 26, 2018
9c70026
addressing review comments
blushingpenguin Jul 27, 2018
8261356
Merge branch 'master' into acceptlanguage
blushingpenguin Jul 27, 2018
da95789
fix lint warning
blushingpenguin Jul 27, 2018
4495e16
Merge branch 'master' into acceptlanguage
blushingpenguin Aug 7, 2018
c60aacb
Merge branch 'master' into acceptlanguage
blushingpenguin Aug 31, 2018
6e78127
Merge branch 'master' into acceptlanguage
blushingpenguin Mar 6, 2019
adbc32d
Merge branch 'master' into acceptlanguage
blushingpenguin Oct 2, 2019
fc62da6
use built in methods that preserve array index rather than adding it …
blushingpenguin Dec 6, 2019
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27 changes: 23 additions & 4 deletions fluent-langneg/src/accepted_languages.js
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Original file line number Diff line number Diff line change
@@ -1,7 +1,26 @@
export default function acceptedLanguages(string = "") {
if (typeof string !== "string") {
function parseAcceptLanguageEntry(entry, index) {
const langWithQ = entry.split(";").map(u => u.trim());
let q = 1.0;
if (langWithQ.length > 1) {
const qVal = langWithQ[1].split("=").map(u => u.trim());
if (qVal.length === 2 && qVal[0].toLowerCase() === "q") {
const qn = Number(qVal[1]);
q = isNaN(qn) ? 0.0 : qn;
}
}
return { index: index, lang: langWithQ[0], q };
}

export default function acceptedLanguages(acceptLanguageHeader = "") {
if (typeof acceptLanguageHeader !== "string") {
throw new TypeError("Argument must be a string");
}
const tokens = string.split(",").map(t => t.trim());
return tokens.filter(t => t !== "").map(t => t.split(";")[0]);
const tokens = acceptLanguageHeader.split(",").map(t => t.trim())
.filter(t => t !== "");
const langsWithQ = [];
tokens.forEach((t, index) =>
langsWithQ.push(parseAcceptLanguageEntry(t, index)));
// order by q descending, keeping the header order for equal weights
langsWithQ.sort((a, b) => a.q === b.q ? a.index - b.index : b.q - a.q);
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Non-blocking cleanup suggestion:

function parseAcceptLanguageEntry(entry) {
  const langWithQ = entry.split(";").map(u => u.trim());
  let q = 1.0;
  if (langWithQ.length > 1) {
    const qVal = langWithQ[1].split("=").map(u => u.trim());
    if (qVal.length === 2 && qVal[0].toLowerCase() === "q") {
      const qn = Number(qVal[1]);
      q = isNaN(qn) ? 0.0 : qn;
    }
  }
  return { lang: langWithQ[0], q };
}

const langsWithQ = Array.from(tokens.map(parseAcceptLanguageEntry).entries());
// order by q descending, keeping the header order for equal weights
langsWithQ.sort(([aidx, aval], [bidx, bval]) => aval.q === bval.q ? aidx - bidx : bval.q - aval.q);
return langsWithQ.map(([idx, val]) => val.lang);

I hand-written it so it may not launch but I hope the intention is expressed in my snippet. I'm trying to save us from reallocating the array in the loop. Alternatively, you could also likely do const langsWithQ = Array(tokens.length); which I guess is simpler.
The other thing I wanted to improve in my snippet is to not carry around the index, since the langsWithQ preserves the order of tokens, so there's no value in storing it on the langWithQ struct.

@blushingpenguin - do you like the proposed changes or would you prefer to land as-is?

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Nicer your way I think -- I wasn't aware of Array.entries. I have updated the code and retested it.

return langsWithQ.map(t => t.lang);
}
47 changes: 47 additions & 0 deletions fluent-langneg/test/headers_test.js
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Original file line number Diff line number Diff line change
Expand Up @@ -29,6 +29,53 @@ suite('parse headers', () => {
);
});

test('with out of order quality values', () => {
assert.deepStrictEqual(
acceptedLanguages('en;q=0.8, fr;q=0.9, de;q=0.7, *;q=0.5, fr-CH'), [
'fr-CH',
'fr',
'en',
'de',
'*'
]
);
});

test('with equal q values', () => {
assert.deepStrictEqual(
acceptedLanguages('en;q=0.1, fr;q=0.1, de;q=0.1, *;q=0.1'), [
'en',
'fr',
'de',
'*'
]
);
});

test('with duff q values', () => {
assert.deepStrictEqual(
acceptedLanguages('en;q=no, fr;z=0.9, de;q=0.7;q=9, *;q=0.5, fr-CH;q=a=0.1'), [
'fr',
'fr-CH',
'de',
'*',
'en'
]
);
});

test('with empty entries', () => {
assert.deepStrictEqual(
acceptedLanguages('en;q=0.8,,, fr;q=0.9,, de;q=0.7, *;q=0.5, fr-CH'), [
'fr-CH',
'fr',
'en',
'de',
'*'
]
);
});

test('edge cases', () => {
const args = [
null,
Expand Down