/
css_decls_border_radius.go
213 lines (188 loc) · 6.47 KB
/
css_decls_border_radius.go
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package css_parser
import (
"github.com/evanw/esbuild/internal/css_ast"
"github.com/evanw/esbuild/internal/css_lexer"
"github.com/evanw/esbuild/internal/logger"
)
const (
borderRadiusTopLeft = iota
borderRadiusTopRight
borderRadiusBottomRight
borderRadiusBottomLeft
)
type borderRadiusCorner struct {
firstToken css_ast.Token
secondToken css_ast.Token
unitSafety unitSafetyTracker
ruleIndex uint32 // The index of the originating rule in the rules array
wasSingleRule bool // True if the originating rule was just for this side
}
type borderRadiusTracker struct {
corners [4]borderRadiusCorner
important bool // True if all active rules were flagged as "!important"
}
func (borderRadius *borderRadiusTracker) updateCorner(rules []css_ast.Rule, corner int, new borderRadiusCorner) {
if old := borderRadius.corners[corner]; old.firstToken.Kind != css_lexer.TEndOfFile &&
(!new.wasSingleRule || old.wasSingleRule) &&
old.unitSafety.status == unitSafe && new.unitSafety.status == unitSafe {
rules[old.ruleIndex] = css_ast.Rule{}
}
borderRadius.corners[corner] = new
}
func (borderRadius *borderRadiusTracker) mangleCorners(rules []css_ast.Rule, decl *css_ast.RDeclaration, index int, minifyWhitespace bool) {
// Reset if we see a change in the "!important" flag
if borderRadius.important != decl.Important {
borderRadius.corners = [4]borderRadiusCorner{}
borderRadius.important = decl.Important
}
tokens := decl.Value
beforeSplit := len(tokens)
afterSplit := len(tokens)
// Search for the single slash if present
for i, t := range tokens {
if t.Kind == css_lexer.TDelimSlash {
if beforeSplit == len(tokens) {
beforeSplit = i
afterSplit = i + 1
} else {
// Multiple slashes are an error
borderRadius.corners = [4]borderRadiusCorner{}
return
}
}
}
// Use a single tracker for the whole rule
unitSafety := unitSafetyTracker{}
for _, t := range tokens[:beforeSplit] {
unitSafety.includeUnitOf(t)
}
for _, t := range tokens[afterSplit:] {
unitSafety.includeUnitOf(t)
}
firstRadii, firstRadiiOk := expandTokenQuad(tokens[:beforeSplit], "")
lastRadii, lastRadiiOk := expandTokenQuad(tokens[afterSplit:], "")
// Stop now if the pattern wasn't matched
if !firstRadiiOk || (beforeSplit < afterSplit && !lastRadiiOk) {
borderRadius.corners = [4]borderRadiusCorner{}
return
}
// Handle the first radii
for corner, t := range firstRadii {
if unitSafety.status == unitSafe {
t.TurnLengthIntoNumberIfZero()
}
borderRadius.updateCorner(rules, corner, borderRadiusCorner{
firstToken: t,
secondToken: t,
unitSafety: unitSafety,
ruleIndex: uint32(index),
})
}
// Handle the last radii
if lastRadiiOk {
for corner, t := range lastRadii {
if unitSafety.status == unitSafe {
t.TurnLengthIntoNumberIfZero()
}
borderRadius.corners[corner].secondToken = t
}
}
// Success
borderRadius.compactRules(rules, decl.KeyRange, minifyWhitespace)
}
func (borderRadius *borderRadiusTracker) mangleCorner(rules []css_ast.Rule, decl *css_ast.RDeclaration, index int, minifyWhitespace bool, corner int) {
// Reset if we see a change in the "!important" flag
if borderRadius.important != decl.Important {
borderRadius.corners = [4]borderRadiusCorner{}
borderRadius.important = decl.Important
}
if tokens := decl.Value; (len(tokens) == 1 && tokens[0].Kind.IsNumeric()) ||
(len(tokens) == 2 && tokens[0].Kind.IsNumeric() && tokens[1].Kind.IsNumeric()) {
firstToken := tokens[0]
secondToken := firstToken
if len(tokens) == 2 {
secondToken = tokens[1]
}
// Check to see if these units are safe to use in every browser
unitSafety := unitSafetyTracker{}
unitSafety.includeUnitOf(firstToken)
unitSafety.includeUnitOf(secondToken)
// Only collapse "0unit" into "0" if the unit is safe
if unitSafety.status == unitSafe && firstToken.TurnLengthIntoNumberIfZero() {
tokens[0] = firstToken
}
if len(tokens) == 2 {
if unitSafety.status == unitSafe && secondToken.TurnLengthIntoNumberIfZero() {
tokens[1] = secondToken
}
// If both tokens are equal, merge them into one
if firstToken.EqualIgnoringWhitespace(secondToken) {
tokens[0].Whitespace &= ^css_ast.WhitespaceAfter
decl.Value = tokens[:1]
}
}
borderRadius.updateCorner(rules, corner, borderRadiusCorner{
firstToken: firstToken,
secondToken: secondToken,
unitSafety: unitSafety,
ruleIndex: uint32(index),
wasSingleRule: true,
})
borderRadius.compactRules(rules, decl.KeyRange, minifyWhitespace)
} else {
borderRadius.corners = [4]borderRadiusCorner{}
}
}
func (borderRadius *borderRadiusTracker) compactRules(rules []css_ast.Rule, keyRange logger.Range, minifyWhitespace bool) {
// All tokens must be present
if eof := css_lexer.TEndOfFile; borderRadius.corners[0].firstToken.Kind == eof || borderRadius.corners[1].firstToken.Kind == eof ||
borderRadius.corners[2].firstToken.Kind == eof || borderRadius.corners[3].firstToken.Kind == eof {
return
}
// All tokens must have the same unit
for _, side := range borderRadius.corners[1:] {
if !side.unitSafety.isSafeWith(borderRadius.corners[0].unitSafety) {
return
}
}
// Generate the most minimal representation
tokens := compactTokenQuad(
borderRadius.corners[0].firstToken,
borderRadius.corners[1].firstToken,
borderRadius.corners[2].firstToken,
borderRadius.corners[3].firstToken,
minifyWhitespace,
)
secondTokens := compactTokenQuad(
borderRadius.corners[0].secondToken,
borderRadius.corners[1].secondToken,
borderRadius.corners[2].secondToken,
borderRadius.corners[3].secondToken,
minifyWhitespace,
)
if !css_ast.TokensEqualIgnoringWhitespace(tokens, secondTokens) {
var whitespace css_ast.WhitespaceFlags
if !minifyWhitespace {
whitespace = css_ast.WhitespaceBefore | css_ast.WhitespaceAfter
}
tokens = append(tokens, css_ast.Token{
Kind: css_lexer.TDelimSlash,
Text: "/",
Whitespace: whitespace,
})
tokens = append(tokens, secondTokens...)
}
// Remove all of the existing declarations
rules[borderRadius.corners[0].ruleIndex] = css_ast.Rule{}
rules[borderRadius.corners[1].ruleIndex] = css_ast.Rule{}
rules[borderRadius.corners[2].ruleIndex] = css_ast.Rule{}
rules[borderRadius.corners[3].ruleIndex] = css_ast.Rule{}
// Insert the combined declaration where the last rule was
rules[borderRadius.corners[3].ruleIndex].Data = &css_ast.RDeclaration{
Key: css_ast.DBorderRadius,
KeyText: "border-radius",
Value: tokens,
KeyRange: keyRange,
Important: borderRadius.important,
}
}