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generator.go
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generator.go
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package csskit
import (
"bufio"
"fmt"
"io"
"slices"
"strconv"
"strings"
)
var unitOrder = map[string]int{
"px": 0,
"%": 1,
"vw": 2,
"vh": 3,
"rad": 4,
"deg": 5,
"ms": 6,
"s": 7,
}
type parsedToken struct {
Type TokenType
TextValue string
NumValue float32
}
type cssClass struct {
Name string
Tokens []parsedToken
Props []CSSProperty
}
func GenerateCSS(w io.Writer, rcs []RawCSSClass) error {
bw := bufio.NewWriter(w)
_, err := fmt.Fprintln(bw, "/* Code generated by CSSKit - DO NOT EDIT. */")
if err != nil {
return err
}
classMap := make(map[string]struct{})
var classes []cssClass
for _, rc := range rcs {
key, err := getClassKey(rc.Tokens)
if err != nil {
return err
}
if _, exists := classMap[key]; exists {
continue
} else {
classMap[key] = struct{}{}
}
class, err := parseCSSClass(rc)
if err != nil {
return err
}
classes = append(classes, class)
}
slices.SortFunc(classes, compareClass)
for _, class := range classes {
_, err := fmt.Fprintf(bw, "\n.%s {\n", class.Name)
if err != nil {
return err
}
for _, prop := range class.Props {
_, err = fmt.Fprintf(bw, " %s: %s;\n", prop.Property, prop.Value)
if err != nil {
return err
}
}
_, err = fmt.Fprintln(bw, "}")
if err != nil {
return err
}
}
return bw.Flush()
}
func getClassKey(tokens []Token) (string, error) {
var sb strings.Builder
for _, tok := range tokens {
if _, err := sb.WriteString(tok.Value); err != nil {
return "", err
}
}
return sb.String(), nil
}
func compareClass(a, b cssClass) int {
tokCountA := len(a.Tokens)
tokCountB := len(b.Tokens)
minTokCount := min(tokCountA, tokCountB)
unitA := ""
unitB := ""
if a.Tokens[tokCountA-1].Type == TokenUnit {
unitA = a.Tokens[tokCountA-1].TextValue
}
if b.Tokens[tokCountB-1].Type == TokenUnit {
unitB = b.Tokens[tokCountB-1].TextValue
}
for i := 0; i < minTokCount; i++ {
tokA := a.Tokens[i]
tokB := b.Tokens[i]
if tokA.Type == TokenKeyword && tokB.Type == TokenKeyword {
res := compareStrings(tokA.TextValue, tokB.TextValue)
if res == 0 {
continue
} else {
return res
}
}
if tokA.Type == TokenNumber && tokB.Type == TokenNumber {
if unitA == unitB {
res := compareFloats(tokA.NumValue, tokB.NumValue)
if res == 0 {
continue
} else {
return res
}
}
if unitA == "" && unitB != "" {
return -1
}
if unitA != "" && unitB == "" {
return 1
}
return compareUnits(unitA, unitB)
}
if tokA.Type == TokenKeyword && tokB.Type == TokenNumber {
return 1
}
if tokA.Type == TokenNumber && tokB.Type == TokenKeyword {
return -1
}
if tokA.Type == TokenHyphen && tokB.Type == TokenHyphen {
continue
}
if tokA.Type == TokenHyphen && tokB.Type == TokenUnit {
return 1
}
if tokA.Type == TokenUnit && tokB.Type == TokenHyphen {
return -1
}
typeNameA := GetTokenTypeName(tokA.Type)
typeNameB := GetTokenTypeName(tokB.Type)
err := fmt.Errorf("unexpected comparison between %q and %q tokens", typeNameA, typeNameB)
panic(err)
}
panic(fmt.Errorf("unexpected comparison between the same class"))
}
func compareStrings(a, b string) int {
if a < b {
return -1
} else if a > b {
return 1
}
return 0
}
func compareFloats(a, b float32) int {
if a < b {
return -1
} else if a > b {
return 1
}
return 0
}
func compareUnits(a, b string) int {
posA, okA := unitOrder[a]
posB, okB := unitOrder[b]
if !okA {
panic(fmt.Errorf("unrecognized unit: %s", a))
}
if !okB {
panic(fmt.Errorf("unrecognized unit: %s", b))
}
if posA < posB {
return -1
} else if posA > posB {
return 1
}
return 0
}
func parseCSSClass(rc RawCSSClass) (cssClass, error) {
var sb strings.Builder
toks := make([]parsedToken, len(rc.Tokens))
props := slices.Clone(rc.Props)
for i, rtok := range rc.Tokens {
if _, err := sb.WriteString(rtok.Value); err != nil {
return cssClass{}, err
}
tok := parsedToken{Type: rtok.Type}
switch tok.Type {
case TokenKeyword, TokenUnit, TokenHyphen:
tok.TextValue = rtok.Value
case TokenNumber:
n, err := strconv.ParseFloat(rtok.Value, 32)
if err != nil {
return cssClass{}, err
}
tok.NumValue = float32(n)
default:
typeName := GetTokenTypeName(tok.Type)
err := fmt.Errorf("unexpected token type: %s", typeName)
return cssClass{}, err
}
toks[i] = tok
}
identifier := escapeIdentifier(sb.String())
return cssClass{Name: identifier, Tokens: toks, Props: props}, nil
}
func escapeIdentifier(input string) string {
var sb strings.Builder
sb.Grow(len(input))
for _, c := range input {
switch c {
case '%':
sb.WriteString(`\%`)
case '.':
sb.WriteString(`\.`)
default:
sb.WriteRune(c)
}
}
return sb.String()
}