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// Copyright 2024 The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package sass
import (
"fmt"
"regexp"
"sort"
"strings"
"github.com/gohugoio/hugo/common/types/css"
)
const (
HugoVarsNamespace = "hugo:vars"
)
func CreateVarsStyleSheet(vars map[string]any) string {
if vars == nil {
return ""
}
var varsStylesheet string
var varsSlice []string
for k, v := range vars {
var prefix string
if !strings.HasPrefix(k, "$") {
prefix = "$"
}
switch v.(type) {
case css.QuotedString:
// Marked by the user as a string that needs to be quoted.
varsSlice = append(varsSlice, fmt.Sprintf("%s%s: %q;", prefix, k, v))
default:
if isTypedCSSValue(v) {
// E.g. 24px, 1.5rem, 10%, hsl(0, 0%, 100%), calc(24px + 36px), #fff, #ffffff.
varsSlice = append(varsSlice, fmt.Sprintf("%s%s: %v;", prefix, k, v))
} else {
// unquote will preserve quotes around URLs etc. if needed.
varsSlice = append(varsSlice, fmt.Sprintf("%s%s: unquote(%q);", prefix, k, v))
}
}
}
sort.Strings(varsSlice)
varsStylesheet = strings.Join(varsSlice, "\n")
return varsStylesheet
}
var (
isCSSColor = regexp.MustCompile(`^#[0-9a-fA-F]{3,6}$`)
isCSSFunc = regexp.MustCompile(`^([a-zA-Z-]+)\(`)
isCSSUnit = regexp.MustCompile(`^([0-9]+)(\.[0-9]+)?([a-zA-Z-%]+)$`)
)
// isTypedCSSValue returns true if the given string is a CSS value that
// we should preserve the type of, as in: Not wrap it in quotes.
func isTypedCSSValue(v any) bool {
switch s := v.(type) {
case int, int8, int16, int32, int64, uint, uint8, uint16, uint32, uint64, float32, float64, css.UnquotedString:
return true
case string:
if isCSSColor.MatchString(s) {
return true
}
if isCSSFunc.MatchString(s) {
return true
}
if isCSSUnit.MatchString(s) {
return true
}
}
return false
}
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