-
Notifications
You must be signed in to change notification settings - Fork 1.2k
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
css gradients: lower colors, fix double positions
- Loading branch information
Showing
8 changed files
with
338 additions
and
11 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,207 @@ | ||
| package css_parser | ||
|
|
||
| import ( | ||
| "strings" | ||
|
|
||
| "github.com/evanw/esbuild/internal/compat" | ||
| "github.com/evanw/esbuild/internal/css_ast" | ||
| "github.com/evanw/esbuild/internal/css_lexer" | ||
| ) | ||
|
|
||
| type gradientKind uint8 | ||
|
|
||
| const ( | ||
| linearGradient gradientKind = iota | ||
| radialGradient | ||
| conicGradient | ||
| ) | ||
|
|
||
| type parsedGradient struct { | ||
| initialTokens []css_ast.Token | ||
| colorStops []colorStop | ||
| kind gradientKind | ||
| repeating bool | ||
| } | ||
|
|
||
| type colorStop struct { | ||
| positions []css_ast.Token | ||
| color css_ast.Token | ||
| } | ||
|
|
||
| func parseGradient(token css_ast.Token) (gradient parsedGradient, success bool) { | ||
| if token.Kind != css_lexer.TFunction { | ||
| return | ||
| } | ||
|
|
||
| switch strings.ToLower(token.Text) { | ||
| case "linear-gradient": | ||
| gradient.kind = linearGradient | ||
|
|
||
| case "radial-gradient": | ||
| gradient.kind = radialGradient | ||
|
|
||
| case "conic-gradient": | ||
| gradient.kind = conicGradient | ||
|
|
||
| case "repeating-linear-gradient": | ||
| gradient.kind = linearGradient | ||
| gradient.repeating = true | ||
|
|
||
| case "repeating-radial-gradient": | ||
| gradient.kind = radialGradient | ||
| gradient.repeating = true | ||
|
|
||
| case "repeating-conic-gradient": | ||
| gradient.kind = conicGradient | ||
| gradient.repeating = true | ||
|
|
||
| default: | ||
| return | ||
| } | ||
|
|
||
| // Bail if any token is a "var()" since it may introduce commas | ||
| tokens := *token.Children | ||
| for _, t := range tokens { | ||
| if t.Kind == css_lexer.TFunction && strings.EqualFold(t.Text, "var") { | ||
| return | ||
| } | ||
| } | ||
|
|
||
| // Try to strip the initial tokens | ||
| if len(tokens) > 0 && !looksLikeColor(tokens[0]) { | ||
| i := 0 | ||
| for i < len(tokens) && tokens[i].Kind != css_lexer.TComma { | ||
| i++ | ||
| } | ||
| gradient.initialTokens = tokens[:i] | ||
| if i < len(tokens) { | ||
| tokens = tokens[i+1:] | ||
| } else { | ||
| tokens = nil | ||
| } | ||
| } | ||
|
|
||
| // Try to parse the color stops | ||
| for len(tokens) > 0 { | ||
| // Parse the color | ||
| color := tokens[0] | ||
| if !looksLikeColor(color) { | ||
| return | ||
| } | ||
| tokens = tokens[1:] | ||
|
|
||
| // Parse up to two positions | ||
| var positions []css_ast.Token | ||
| for len(positions) < 2 && len(tokens) > 0 { | ||
| position := tokens[0] | ||
| if position.Kind.IsNumeric() || (position.Kind == css_lexer.TFunction && strings.EqualFold(position.Text, "calc")) { | ||
| positions = append(positions, position) | ||
| } else { | ||
| break | ||
| } | ||
| tokens = tokens[1:] | ||
| } | ||
|
|
||
| // Add the color stop | ||
| gradient.colorStops = append(gradient.colorStops, colorStop{ | ||
| color: color, | ||
| positions: positions, | ||
| }) | ||
|
|
||
| // Parse the comma | ||
| if len(tokens) > 0 { | ||
| if tokens[0].Kind != css_lexer.TComma { | ||
| return | ||
| } | ||
| tokens = tokens[1:] | ||
| } | ||
| } | ||
|
|
||
| success = true | ||
| return | ||
| } | ||
|
|
||
| func (p *parser) generateGradient(token css_ast.Token, gradient parsedGradient) css_ast.Token { | ||
| var children []css_ast.Token | ||
| commaToken := p.commaToken(token.Loc) | ||
|
|
||
| children = append(children, gradient.initialTokens...) | ||
| for _, stop := range gradient.colorStops { | ||
| if len(children) > 0 { | ||
| children = append(children, commaToken) | ||
| } | ||
| children = append(children, stop.color) | ||
| children = append(children, stop.positions...) | ||
| } | ||
|
|
||
| token.Children = &children | ||
| return token | ||
| } | ||
|
|
||
| func (p *parser) lowerAndMinifyGradient(token css_ast.Token, wouldClipColor *bool) css_ast.Token { | ||
| gradient, ok := parseGradient(token) | ||
| if !ok { | ||
| return token | ||
| } | ||
|
|
||
| // Lower all colors in the gradient stop | ||
| for i, stop := range gradient.colorStops { | ||
| gradient.colorStops[i].color = p.lowerAndMinifyColor(stop.color, wouldClipColor) | ||
| } | ||
|
|
||
| if p.options.unsupportedCSSFeatures.Has(compat.GradientDoublePosition) { | ||
| // Replace double positions with duplicated single positions | ||
| for _, stop := range gradient.colorStops { | ||
| if len(stop.positions) > 1 { | ||
| gradient.colorStops = switchToSinglePositions(gradient.colorStops) | ||
| break | ||
| } | ||
| } | ||
| } else if p.options.minifySyntax { | ||
| // Replace duplicated single positions with double positions | ||
| for i, stop := range gradient.colorStops { | ||
| if i > 0 && len(stop.positions) == 1 { | ||
| if prev := gradient.colorStops[i-1]; len(prev.positions) == 1 && | ||
| css_ast.TokensEqual([]css_ast.Token{prev.color}, []css_ast.Token{stop.color}, nil) { | ||
| gradient.colorStops = switchToDoublePositions(gradient.colorStops) | ||
| break | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return p.generateGradient(token, gradient) | ||
| } | ||
|
|
||
| func switchToSinglePositions(double []colorStop) (single []colorStop) { | ||
| for _, stop := range double { | ||
| for _, position := range stop.positions { | ||
| position.Whitespace = css_ast.WhitespaceBefore | ||
| stop.positions = []css_ast.Token{position} | ||
| single = append(single, stop) | ||
| } | ||
| if len(stop.positions) == 0 { | ||
| single = append(single, stop) | ||
| } | ||
| } | ||
| return | ||
| } | ||
|
|
||
| func switchToDoublePositions(single []colorStop) (double []colorStop) { | ||
| for i := 0; i < len(single); i++ { | ||
| stop := single[i] | ||
| if i+1 < len(single) && len(stop.positions) == 1 { | ||
| if next := single[i+1]; len(next.positions) == 1 && | ||
| css_ast.TokensEqual([]css_ast.Token{stop.color}, []css_ast.Token{next.color}, nil) { | ||
| double = append(double, colorStop{ | ||
| color: stop.color, | ||
| positions: []css_ast.Token{stop.positions[0], next.positions[0]}, | ||
| }) | ||
| i++ | ||
| continue | ||
| } | ||
| } | ||
| double = append(double, stop) | ||
| } | ||
| return | ||
| } |
Oops, something went wrong.