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Allow conversion of rem font size to pixels in typography presets #1304

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Allow conversion of rem font size to pixels in typography presets #1304

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4565985
Helper method to convert preset to px values
jamesmockett Mar 22, 2024
e9e1cdc
Update helper name
jamesmockett Mar 25, 2024
ef957b7
Add tests for preset rem to px helper
jamesmockett Mar 25, 2024
5ed321a
Remove unused import
jamesmockett Mar 25, 2024
d4e7754
Add comment to conversion function
jamesmockett Mar 25, 2024
751bc9b
Add TypographyPreset type
jamesmockett Mar 27, 2024
7a98a77
Lowercase 'italic' in tokens so it satisfies type
jamesmockett Mar 27, 2024
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2 changes: 1 addition & 1 deletion libs/@guardian/design-tokens/src/tokens.json
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Original file line number Diff line number Diff line change
Expand Up @@ -1537,7 +1537,7 @@
"fontSize": "{typography.fontSize.14}",
"lineHeight": "{typography.lineHeight.regular}",
"fontWeight": "{typography.fontWeight.regular}",
"fontStyle": "Italic"
"fontStyle": "italic"
}
},
"textSansItalic15": {
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2 changes: 1 addition & 1 deletion libs/@guardian/design-tokens/tokens.d.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -1444,7 +1444,7 @@ export declare const tokens: {
readonly fontSize: '14px';
readonly lineHeight: 1.3;
readonly fontWeight: 400;
readonly fontStyle: 'Italic';
readonly fontStyle: 'italic';
};
readonly textSansItalic15: {
readonly fontFamily: readonly [
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2 changes: 1 addition & 1 deletion libs/@guardian/design-tokens/tokens.js
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Original file line number Diff line number Diff line change
Expand Up @@ -1440,7 +1440,7 @@ export const tokens = {
fontSize: '14px',
lineHeight: 1.3,
fontWeight: 400,
fontStyle: 'Italic',
fontStyle: 'italic',
},
textSansItalic15: {
fontFamily: [
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2 changes: 1 addition & 1 deletion libs/@guardian/design-tokens/variables.css
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Original file line number Diff line number Diff line change
Expand Up @@ -1410,7 +1410,7 @@
--source-typography-presets-textSansItalic14-font-size: var(
--source-typography-fontSize-14
);
--source-typography-presets-textSansItalic14-font-style: Italic;
--source-typography-presets-textSansItalic14-font-style: italic;
--source-typography-presets-textSansItalic14-font-weight: var(
--source-typography-fontWeight-regular
);
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4 changes: 2 additions & 2 deletions libs/@guardian/source-foundations/src/tokens.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -1870,7 +1870,7 @@ describe('Typography preset CSS output', () => {
font-size: 0.875rem;
line-height: 1.3;
font-weight: 400;
font-style: Italic;
font-style: italic;
--source-text-decoration-thickness: 2px;
`,
{ isFragment: true },
Expand Down Expand Up @@ -2681,7 +2681,7 @@ describe('Typography preset object output', () => {
fontSize: '0.875rem',
lineHeight: 1.3,
fontWeight: 400,
fontStyle: 'Italic',
fontStyle: 'italic',
});
expect(typePresetObject.textSansItalic15Object).toEqual({
fontFamily:
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2 changes: 1 addition & 1 deletion libs/@guardian/source-foundations/src/typography/css.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -790,7 +790,7 @@ export const textSansItalic14 = `
font-size: 0.875rem;
line-height: 1.3;
font-weight: 400;
font-style: Italic;
font-style: italic;
--source-text-decoration-thickness: 2px;
`;

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2 changes: 1 addition & 1 deletion libs/@guardian/source-foundations/src/typography/objects.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -741,7 +741,7 @@ export const textSansItalic14Object = {
fontSize: '0.875rem',
lineHeight: 1.3,
fontWeight: 400,
fontStyle: 'Italic',
fontStyle: 'italic',
} as const;

export const textSansItalic15Object = {
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9 changes: 9 additions & 0 deletions libs/@guardian/source-foundations/src/typography/types.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -115,3 +115,12 @@ export type Fs = <
unit: ScaleUnit;
},
) => TypographyStyles;

export type TypographyPreset = `
font-family: ${string};
font-size: ${number}rem;
line-height: ${number};
font-weight: ${number};
font-style: ${'normal' | 'italic'};
--source-text-decoration-thickness: ${number}px;
`;
30 changes: 30 additions & 0 deletions libs/@guardian/source-foundations/src/utils/typography.test.ts
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Original file line number Diff line number Diff line change
@@ -0,0 +1,30 @@
import { headlineBold24, titlepiece42 } from '../typography/css';
import { presetToPx } from './typography';

describe('presetToPx', () => {
it('should convert preset font size value from rem to px', () => {
expect(presetToPx(headlineBold24)).toMatchCSS(
`
font-family: "GH Guardian Headline", "Guardian Egyptian Web", Georgia, serif;
font-size: 24px;
line-height: 1.15;
font-weight: 700;
font-style: normal;
--source-text-decoration-thickness: 3px;
`,
{ isFragment: true },
);

expect(presetToPx(titlepiece42)).toMatchCSS(
`
font-family: "GT Guardian Titlepiece", Georgia, serif;
font-size: 42px;
line-height: 1.15;
font-weight: 700;
font-style: normal;
--source-text-decoration-thickness: 5px;
`,
{ isFragment: true },
);
});
});
16 changes: 16 additions & 0 deletions libs/@guardian/source-foundations/src/utils/typography.ts
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Original file line number Diff line number Diff line change
@@ -0,0 +1,16 @@
import type { TypographyPreset } from '../typography/types';

/*
* Convert `font-size` value in typography preset from rem to px
*/
export const presetToPx = (preset: TypographyPreset) => {
const REGEX_FONT_SIZE = /font-size:\s(\d+\.\d+)rem/;
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@mxdvl mxdvl Mar 28, 2024 •
edited
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I think you might have an issue if the value does not contain a decimal part… Thankfully we currently do not use 16px, 32px or 48px as a font size, but we might in the future!

Suggested change
const REGEX_FONT_SIZE = /font-size:\s(\d+\.\d+)rem/;
const REGEX_FONT_SIZE = /font-size:\s(\d+\.?\d*)rem/;

Explore in Regex101

image


const matches = preset.match(REGEX_FONT_SIZE);
if (matches?.[1]) {
const pxVal = parseFloat(matches[1]) * 16;
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This nombre magique is exposed as rootPixelFontSize in ./convert-value. Shall we pull it in here?

return preset.replace(REGEX_FONT_SIZE, `font-size: ${pxVal}px`);
}

return preset;
Comment on lines +9 to +15
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@mxdvl mxdvl Mar 28, 2024 •
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You can also use a replacer function as part of String.prototype.replace, which could make this simpler:

return preset.replace(REGEX_FONT_SIZE, (_, match) => {
  const pxValue = parseFloat(match) * 16;
  return `font-size: ${pxValue}px`;
})

};