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package css
import (
"fmt"
"strings"
)
const (
indentSpace = 2
)
// RuleKind represents a Rule kind
type RuleKind int
// Rule kinds
const (
QualifiedRule RuleKind = iota
AtRule
)
// At Rules than have Rules inside their block instead of Declarations
var atRulesWithRulesBlock = []string{
"@document", "@font-feature-values", "@keyframes", "@media", "@supports",
}
// Rule represents a parsed CSS rule
type Rule struct {
Kind RuleKind
// At Rule name (eg: "@media")
Name string
// Raw prelude
Prelude string
// Qualified Rule selectors parsed from prelude
Selectors []string
// Style properties
Declarations []*Declaration
// At Rule embedded rules
Rules []*Rule
// Current rule embedding level
EmbedLevel int
}
// NewRule instanciates a new Rule
func NewRule(kind RuleKind) *Rule {
return &Rule{
Kind: kind,
}
}
// Returns string representation of rule kind
func (kind RuleKind) String() string {
switch kind {
case QualifiedRule:
return "Qualified Rule"
case AtRule:
return "At Rule"
default:
return "WAT"
}
}
// EmbedsRules returns true if this rule embeds another rules
func (rule *Rule) EmbedsRules() bool {
if rule.Kind == AtRule {
for _, atRuleName := range atRulesWithRulesBlock {
if rule.Name == atRuleName {
return true
}
}
}
return false
}
// Equal returns true if both rules are equals
func (rule *Rule) Equal(other *Rule) bool {
if (rule.Kind != other.Kind) ||
(rule.Prelude != other.Prelude) ||
(rule.Name != other.Name) {
return false
}
if (len(rule.Selectors) != len(other.Selectors)) ||
(len(rule.Declarations) != len(other.Declarations)) ||
(len(rule.Rules) != len(other.Rules)) {
return false
}
for i, sel := range rule.Selectors {
if sel != other.Selectors[i] {
return false
}
}
for i, decl := range rule.Declarations {
if !decl.Equal(other.Declarations[i]) {
return false
}
}
for i, rule := range rule.Rules {
if !rule.Equal(other.Rules[i]) {
return false
}
}
return true
}
// Diff returns a string representation of rules differences
func (rule *Rule) Diff(other *Rule) []string {
result := []string{}
if rule.Kind != other.Kind {
result = append(result, fmt.Sprintf("Kind: %s | %s", rule.Kind.String(), other.Kind.String()))
}
if rule.Prelude != other.Prelude {
result = append(result, fmt.Sprintf("Prelude: \"%s\" | \"%s\"", rule.Prelude, other.Prelude))
}
if rule.Name != other.Name {
result = append(result, fmt.Sprintf("Name: \"%s\" | \"%s\"", rule.Name, other.Name))
}
if len(rule.Selectors) != len(other.Selectors) {
result = append(result, fmt.Sprintf("Selectors: %v | %v", strings.Join(rule.Selectors, ", "), strings.Join(other.Selectors, ", ")))
} else {
for i, sel := range rule.Selectors {
if sel != other.Selectors[i] {
result = append(result, fmt.Sprintf("Selector: \"%s\" | \"%s\"", sel, other.Selectors[i]))
}
}
}
if len(rule.Declarations) != len(other.Declarations) {
result = append(result, fmt.Sprintf("Declarations Nb: %d | %d", len(rule.Declarations), len(other.Declarations)))
} else {
for i, decl := range rule.Declarations {
if !decl.Equal(other.Declarations[i]) {
result = append(result, fmt.Sprintf("Declaration: \"%s\" | \"%s\"", decl.String(), other.Declarations[i].String()))
}
}
}
if len(rule.Rules) != len(other.Rules) {
result = append(result, fmt.Sprintf("Rules Nb: %d | %d", len(rule.Rules), len(other.Rules)))
} else {
for i, rule := range rule.Rules {
if !rule.Equal(other.Rules[i]) {
result = append(result, fmt.Sprintf("Rule: \"%s\" | \"%s\"", rule.String(), other.Rules[i].String()))
}
}
}
return result
}
// Returns the string representation of a rule
func (rule *Rule) String() string {
result := ""
if rule.Kind == QualifiedRule {
for i, sel := range rule.Selectors {
if i != 0 {
result += ", "
}
result += sel
}
} else {
// AtRule
result += fmt.Sprintf("%s", rule.Name)
if rule.Prelude != "" {
if result != "" {
result += " "
}
result += fmt.Sprintf("%s", rule.Prelude)
}
}
if (len(rule.Declarations) == 0) && (len(rule.Rules) == 0) {
result += ";"
} else {
result += " {\n"
if rule.EmbedsRules() {
for _, subRule := range rule.Rules {
result += fmt.Sprintf("%s%s\n", rule.indent(), subRule.String())
}
} else {
for _, decl := range rule.Declarations {
result += fmt.Sprintf("%s%s\n", rule.indent(), decl.String())
}
}
result += fmt.Sprintf("%s}", rule.indentEndBlock())
}
return result
}
// Returns identation spaces for declarations and rules
func (rule *Rule) indent() string {
result := ""
for i := 0; i < ((rule.EmbedLevel + 1) * indentSpace); i++ {
result += " "
}
return result
}
// Returns identation spaces for end of block character
func (rule *Rule) indentEndBlock() string {
result := ""
for i := 0; i < (rule.EmbedLevel * indentSpace); i++ {
result += " "
}
return result
}
|
