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directive.go
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directive.go
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package estree
import (
"encoding/json"
"fmt"
)
// Directive is a directive from the prologue of a script or function.
type Directive struct {
Loc SourceLocation
Expression Literal
// Directive is the raw string source of the directive without quotes.
Directive string
}
func (Directive) Type() string { return "Directive" }
func (d Directive) Location() SourceLocation { return d.Loc }
func (Directive) MinVersion() Version { return ES5 }
func (Directive) isDirectiveOrStatement() {}
func (d Directive) IsZero() bool {
return d.Loc.IsZero() &&
(d.Expression == nil || d.Expression.IsZero()) &&
d.Directive == ""
}
func (d Directive) Walk(v Visitor) {
if v = v.Visit(d); v != nil {
defer v.Visit(nil)
d.Expression.Walk(v)
}
}
func (d Directive) Errors() []error {
c := nodeChecker{Node: d}
c.require(d.Expression, "directive expression")
return c.errors()
}
func (d Directive) MarshalJSON() ([]byte, error) {
x := nodeToMap(d)
x["expression"] = d.Expression
x["directive"] = d.Directive
return json.Marshal(x)
}
func (d *Directive) UnmarshalJSON(b []byte) error {
var x struct {
Type string `json:"type"`
Loc SourceLocation `json:"loc"`
Expression json.RawMessage `json:"expression"`
Directive string `json:"directive"`
}
err := json.Unmarshal(b, &x)
if err == nil && x.Type != d.Type() {
err = fmt.Errorf("%w %s, got %q", ErrWrongType, d.Type(), x.Type)
}
if err == nil {
d.Loc, d.Directive = x.Loc, x.Directive
d.Expression, _, err = unmarshalLiteral(x.Expression)
}
return err
}