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css-color-parser: fix handling of none in some edge cases #1859

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841623b
css-color-parser: fix handling of `none` in some edge cases
romainmenke Jun 29, 2026
b715946
Merge branch 'main' into css-color-parser--persistent-hummingbird-5bf…
romainmenke Jul 5, 2026
0526181
Merge branch 'main' into css-color-parser--persistent-hummingbird-5bf…
romainmenke Jul 6, 2026
131f669
split color conversion for RCS from interpolation (#1860)
romainmenke Jul 17, 2026
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4 changes: 4 additions & 0 deletions packages/css-color-parser/CHANGELOG.md
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@@ -1,5 +1,9 @@
# Changes to CSS Color Parser

### Unreleased (patch)

- Fix handling of `none` in some edge cases

### 4.1.9

_June 25, 2026_
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2 changes: 1 addition & 1 deletion packages/css-color-parser/dist/index.mjs
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523 changes: 318 additions & 205 deletions packages/css-color-parser/src/color-data.ts
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14 changes: 7 additions & 7 deletions packages/css-color-parser/src/functions/color-mix.ts
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Expand Up @@ -5,7 +5,7 @@ import type { Color } from '@csstools/color-helpers';
import { ColorNotation } from '../color-notation';
import { isTokenIdent, isTokenNumeric, isTokenPercentage } from '@csstools/css-tokenizer';
import { calcFromComponentValues } from '@csstools/css-calc';
import { colorDataTo, SyntaxFlag } from '../color-data';
import { colorDataToForInterpolation, SyntaxFlag } from '../color-data';
import { isFunctionNode, isTokenNode, isWhiteSpaceOrCommentNode } from '@csstools/css-parser-algorithms';
import { toLowerCaseAZ } from '../util/to-lower-case-a-z';
import { mathFunctionNames } from '@csstools/css-calc';
Expand Down Expand Up @@ -279,7 +279,7 @@ function colorMixRectangular(colorSpace: string, items: Array<ColorMixEntry> | f

// 3. If items is length 1, set color to the color of that sole item, converted to the specified interpolation <color-space>.
if (normalizedItems.length === 1) {
const color = colorDataTo(normalizedItems[0].color, outputColorNotation);
const color = colorDataToForInterpolation(normalizedItems[0].color, outputColorNotation);
color.colorNotation = outputColorNotation;
color.syntaxFlags.add(SyntaxFlag.ColorMixVariadic);
color.syntaxFlags.add(SyntaxFlag.ColorMix);
Expand Down Expand Up @@ -369,8 +369,8 @@ function colorMixRectangularPair(colorNotation: ColorNotation, a_color: ColorDat
a_alpha = Number.isNaN(a_alpha) ? b_alpha : a_alpha;
b_alpha = Number.isNaN(b_alpha) ? a_alpha : b_alpha;

const a_channels = colorDataTo(a_color, colorNotation).channels;
const b_channels = colorDataTo(b_color, colorNotation).channels;
const a_channels = colorDataToForInterpolation(a_color, colorNotation).channels;
const b_channels = colorDataToForInterpolation(b_color, colorNotation).channels;

a_channels[0] = fillInMissingComponent(a_channels[0], b_channels[0]);
b_channels[0] = fillInMissingComponent(b_channels[0], a_channels[0]);
Expand Down Expand Up @@ -448,7 +448,7 @@ function colorMixPolar(colorSpace: string, hueInterpolationMethod: string, items

// 3. If items is length 1, set color to the color of that sole item, converted to the specified interpolation <color-space>.
if (normalizedItems.length === 1) {
const color = colorDataTo(normalizedItems[0].color, outputColorNotation);
const color = colorDataToForInterpolation(normalizedItems[0].color, outputColorNotation);
color.colorNotation = outputColorNotation;
color.syntaxFlags.add(SyntaxFlag.ColorMixVariadic);
color.syntaxFlags.add(SyntaxFlag.ColorMix);
Expand Down Expand Up @@ -547,8 +547,8 @@ function colorMixPolarPair(colorNotation: ColorNotation, hueInterpolationMethod:
a_alpha = Number.isNaN(a_alpha) ? b_alpha : a_alpha;
b_alpha = Number.isNaN(b_alpha) ? a_alpha : b_alpha;

const a_channels = colorDataTo(a_color, colorNotation).channels;
const b_channels = colorDataTo(b_color, colorNotation).channels;
const a_channels = colorDataToForInterpolation(a_color, colorNotation).channels;
const b_channels = colorDataToForInterpolation(b_color, colorNotation).channels;

switch (colorNotation) {
case ColorNotation.HSL:
Expand Down
7 changes: 2 additions & 5 deletions packages/css-color-parser/src/functions/color.ts
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@@ -1,5 +1,5 @@
import type { ColorData} from '../color-data';
import { SyntaxFlag, colorDataTo, noneToZeroInRelativeColorDataChannels, normalizeRelativeColorDataChannels } from '../color-data';
import { SyntaxFlag, colorDataToForRelativeColorSyntax, noneToZeroInRelativeColorDataChannels, normalizeRelativeColorDataChannels } from '../color-data';
import type { ColorParser } from '../color-parser';
import { ColorNotation } from '../color-notation';
import type { ComponentValue, FunctionNode} from '@csstools/css-parser-algorithms';
Expand Down Expand Up @@ -106,10 +106,7 @@ export function color(colorFunctionNode: FunctionNode, colorParser: ColorParser)
colorData.colorNotation = colorSpaceNameToColorNotation(colorSpace);

if (relativeToColor) {
if (relativeToColor.colorNotation !== colorData.colorNotation) {
relativeToColor = colorDataTo(relativeToColor, colorData.colorNotation);
}

relativeToColor = colorDataToForRelativeColorSyntax(relativeToColor, colorData.colorNotation);
relativeColorChannels = normalizeRelativeColorDataChannels(relativeToColor);
relativeColorChannelsWithoutNone = noneToZeroInRelativeColorDataChannels(relativeColorChannels);
}
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9 changes: 3 additions & 6 deletions packages/css-color-parser/src/functions/three-channel-space-separated.ts
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@@ -1,10 +1,10 @@
import type { ColorData} from '../color-data';
import { noneToZeroInRelativeColorDataChannels, normalizeRelativeColorDataChannels } from '../color-data';
import { colorDataToForRelativeColorSyntax, noneToZeroInRelativeColorDataChannels, normalizeRelativeColorDataChannels } from '../color-data';
import type { ComponentValue, FunctionNode } from '@csstools/css-parser-algorithms';
import type { TokenNumber} from '@csstools/css-tokenizer';
import { isTokenDelim, isTokenIdent, isTokenNumber, isTokenNumeric } from '@csstools/css-tokenizer';
import type { ColorNotation } from '../color-notation';
import { SyntaxFlag, colorDataTo } from '../color-data';
import { SyntaxFlag } from '../color-data';
import { calcFromComponentValues } from '@csstools/css-calc';
import { isCommentNode, isFunctionNode, isTokenNode, isWhitespaceNode } from '@csstools/css-parser-algorithms';
import type { normalizeChannelValuesFn } from './normalize-channel-values';
Expand Down Expand Up @@ -122,10 +122,7 @@ export function threeChannelSpaceSeparated(

colorData.syntaxFlags.add(SyntaxFlag.RelativeColorSyntax);

if (relativeToColor.colorNotation !== colorNotation) {
relativeToColor = colorDataTo(relativeToColor, colorNotation);
}

relativeToColor = colorDataToForRelativeColorSyntax(relativeToColor, colorNotation);
relativeColorChannels = normalizeRelativeColorDataChannels(relativeToColor);
relativeColorChannelsWithoutNone = noneToZeroInRelativeColorDataChannels(relativeColorChannels);

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3 changes: 2 additions & 1 deletion packages/css-color-parser/test/basic/color-mix-function-oklch.mjs
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Expand Up @@ -5,10 +5,11 @@ import { serialize_OKLCH_data } from '../util/serialize.mjs';

const tests = [
['color-mix(in oklch, oklch(100% 0% 60deg), oklch(50% 50% 0deg))', 'oklch(0.75 0.1 0)'],
['color-mix(in oklch, oklch(100% 0% none), oklch(50% 50% 0deg))', 'oklch(0.75 0.1 0)'],
['color-mix(in oklch, rgb(255, 255, 255), rgb(180, 6, 95))', 'oklch(0.75031 0.10016 359.858)'],
['color-mix(in lch, oklch(75% 0% 60deg), oklch(75% 50% 0deg))', 'oklch(0.74979 0.09824 0.10588)'],
['color-mix(in oklch, oklch(100% 0% none), oklch(50% 50% 0deg))', 'oklch(0.75 0.1 0)'],
['color-mix(in oklch, oklch(100% none 60deg), oklch(50% 50% 0deg))', 'oklch(0.75 0.2 30)'],
['color-mix(in oklch, oklch(100% none 60deg), oklch(50% 50% 0deg))', 'oklch(0.75 0.2 0)'],

// Analogous sets
['color-mix(in oklch, rgb(none none none), oklch(0.5 0.2 50))', 'oklch(0.5 0.2 50)'],
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30 changes: 26 additions & 4 deletions packages/css-color-parser/test/basic/color-mix-function.mjs
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Expand Up @@ -65,6 +65,18 @@ const tests = [
['color-mix(in oklch, green 40%, oklch(0.747 0.196 322.2))', 'rgb(0, 148, 253)'],
['color-mix(in oklch, green 40%, hsl(292deg 85.71% 72.55%))', 'rgb(0, 148, 253)'],

['color-mix(in display-p3-linear, green 40%, color(srgb 0.8978862558205767 0.4885001647805462 0.9594359763905097))', 'rgb(182, 126, 195)'],
['color-mix(in display-p3-linear, green 40%, color(srgb-linear 0.7832360124544266 0.2035510416163499 0.9101924728483531))', 'rgb(182, 126, 195)'],
['color-mix(in display-p3-linear, green 40%, color(a98-rgb 0.8035122804301492 0.484896415622613 0.9440692746539695))', 'rgb(182, 126, 195)'],
['color-mix(in display-p3-linear, green 40%, color(prophoto-rgb 0.7596595159204217 0.4934889951894072 0.8985832663171222))', 'rgb(182, 126, 195)'],
['color-mix(in display-p3-linear, green 40%, color(display-p3 0.843565234 0.509345345 0.9342344435))', 'rgb(182, 126, 195)'],
['color-mix(in display-p3-linear, green 40%, color(rec2020 0.807076644727751 0.5627572708703388 0.9326528689276063))', 'rgb(182, 126, 195)'],
['color-mix(in display-p3-linear, green 40%, color(xyz-d50 0.5501693084815327 0.37536346388820246 0.6806345611398199))', 'rgb(182, 126, 195)'],
['color-mix(in display-p3-linear, green 40%, color(xyz-d65 0.5600582450343325 0.37782875858447507 0.904570025128693))', 'rgb(182, 126, 195)'],
['color-mix(in display-p3-linear, green 40%, color(xyz 0.5600582450343325 0.37782875858447507 0.904570025128693))', 'rgb(182, 126, 195)'],
['color-mix(in display-p3-linear, green 40%, oklch(0.747 0.196 322.2))', 'rgb(182, 126, 195)'],
['color-mix(in display-p3-linear, green 40%, hsl(292deg 85.71% 72.55%))', 'rgb(182, 126, 195)'],

['color-mix(in srgb, color(xyz 1 none 0) 30%, rgb(none 255 128))', 'rgb(255, 255, 255)'],

['color-mix(in oklab, #09232c, white 50%)', 'rgb(123, 137, 142)'],
Expand Down Expand Up @@ -102,9 +114,10 @@ const tests = [
['color-mix(in hsl increasing hue, hsl(180deg 50% 50%), hsl(180deg 50% 50%))', canonicalize('hsl(180deg 50% 50%)')],
['color-mix(in hsl decreasing hue, hsl(180deg 50% 50%), hsl(180deg 50% 50%))', canonicalize('hsl(180deg 50% 50%)')],

['color-mix(in hsl longer hue, hsl(50deg 0% 50%), hsl(50deg 0% 50%))', canonicalize('hsl(230deg 0% 50%)')],
['color-mix(in hsl, color-mix(in hsl longer hue, hsl(50deg 0% 50%), hsl(50deg 0% 50%)), hsl(180deg 100% 50%))', canonicalize('hsl(180deg 50% 50%)')],

['color-mix(in hsl, hsl(30deg 40% 80% / 25%) 0%, hsl(90deg none none / none))', canonicalize('hsl(90deg 40% 80% / 25%)')],
['color-mix(in hsl, hsl(30deg 40% 80% / 25%) 0%, hsl(90deg none none / none))', canonicalize('hsl(30deg 40% 80% / 25%)')],
['color-mix(in hwb, hwb(30deg 30% 40% / 25%) 0%, hwb(90deg none none / 0.5))', canonicalize('hwb(90deg 30% 40% / 0.5)')],
['color-mix(in hsl, hsl(from hsl(none 50% 50%) h s l), hsl(from hsl(120deg 50% 50%) h s l))', canonicalize('hsl(120deg 50% 50%)')],
['color-mix(in hsl, hsl(from hsl(0deg 50% 50%) none s l), hsl(from hsl(120deg 50% 50%) h s l))', canonicalize('hsl(120deg 50% 50%)')],
Expand Down Expand Up @@ -176,6 +189,15 @@ for (const test of tests) {
);
}

assert.deepStrictEqual(
color(parse('color-mix(in lch, lch(50% 50% 180deg), lch(100% 0% 0deg))')),
{
colorNotation: 'lch',
channels: [75, 37.5, 180],
alpha: 1,
syntaxFlags: new Set(['color-mix']),
},
);

assert.deepStrictEqual(
color(parse('color-mix(in hsl, red 0%, blue 0%)')),
Expand Down Expand Up @@ -221,7 +243,7 @@ assert.deepStrictEqual(
color(parse('oklch(from lch(100 0 0deg) l c h)')),
{
colorNotation: 'oklch',
channels: [1, 4.996003610813204e-16, Number.NaN],
channels: [1, 0, Number.NaN],
alpha: 1,
syntaxFlags: new Set(['relative-color-syntax', 'has-number-values']),
},
Expand All @@ -231,7 +253,7 @@ assert.deepStrictEqual(
color(parse('lch(from oklch(100 0 0deg) l c h)')),
{
colorNotation: 'lch',
channels: [100, 1.1102230246251565e-13, Number.NaN],
channels: [100, 0, Number.NaN],
alpha: 1,
syntaxFlags: new Set(['relative-color-syntax', 'has-number-values']),
},
Expand All @@ -241,7 +263,7 @@ assert.deepStrictEqual(
color(parse('color-mix(in oklch, lch(100 0 40deg), lch(100 0 60deg))')),
{
colorNotation: 'oklch',
channels: [1.0000000000000002, 4.996003610813204e-16, Number.NaN],
channels: [1.0000000000000002, 0, Number.NaN],
alpha: 1,
syntaxFlags: new Set(['color-mix']),
},
Expand Down
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