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Support snake case font names as seen in Versatiles styles #40

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Merged
ahocevar merged 1 commit into from
Oct 16, 2026
Merged

Support snake case font names as seen in Versatiles styles #40

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19 changes: 18 additions & 1 deletion index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,23 @@ const fontWeights = {
};
const sp = ' ';
const italicRE = /(italic|oblique)$/i;
const snakeCaseRE = /_/g;
const wordStartRE = /(^| )[a-z]/g;

/**
* @param {string} font Font name, e.g. `'noto_sans_bold'` or `'Noto Sans Bold'`.
* @return {string} Font name with words separated by spaces, e.g. `'Noto Sans Bold'`.
*/
function toWords(font) {
if (font.indexOf('_') === -1) {
return font;
}
// Snake case names, e.g. from VersaTiles styles, are all lower case.
// Capitalized words match the family names that font services use.
return font
.replace(snakeCaseRE, sp)
.replace(wordStartRE, (wordStart) => wordStart.toUpperCase());
}

const fontCache = {};

Expand All @@ -46,7 +63,7 @@ export default function (fonts, size, lineHeight) {
const fontFamilies = [];
let haveWeight, haveStyle;
for (let i = 0, ii = fonts.length; i < ii; ++i) {
const font = fonts[i];
const font = toWords(fonts[i]);
const parts = font.split(' ');
let maybeWeight = parts[parts.length - 1].toLowerCase();
if (
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12 changes: 12 additions & 0 deletions test/index.test.js
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Expand Up @@ -15,6 +15,18 @@ describe('mapbox-to-css-font', function () {
should(parseFont('Inter Semi Bold', 16)).eql('normal 600 16px Inter');
});

it('handle snake case font names', function () {
should(parseFont('noto_sans_regular', 16)).eql(
'normal 400 16px "Noto Sans"',
);
should(parseFont('noto_sans_bold', 16)).eql(
'normal 700 16px "Noto Sans"',
);
should(parseFont('noto_sans_semibold_italic', 16)).eql(
'italic 600 16px "Noto Sans"',
);
});

it('handle line-height', function () {
should(parseFont('monospace', 16)).eql('normal 400 16px monospace');
should(parseFont('monospace', 16, 3.5)).eql(
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