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regsub.go
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regsub.go
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// Code generated by __generator__/interpreter.go at once
package builtin
import (
"regexp"
"github.com/ysugimoto/falco/interpreter/context"
"github.com/ysugimoto/falco/interpreter/function/errors"
"github.com/ysugimoto/falco/interpreter/value"
)
const (
Regsub_Name = "regsub"
regSubExpandReplace = "${$1}"
)
var (
Regsub_ArgumentTypes = []value.Type{value.StringType, value.StringType, value.StringType}
regsubExpandRE = regexp.MustCompile(`\\([0-9]+)`)
)
func replaceOneString(re *regexp.Regexp, input, replacement string) string {
replace := true
return re.ReplaceAllStringFunc(input, func(m string) string {
if !replace {
return m
}
replace = false
return re.ReplaceAllString(m, replacement)
})
}
func Regsub_Validate(args []value.Value) error {
if len(args) != 3 {
return errors.ArgumentNotEnough(Regsub_Name, 3, args)
}
for i := range args {
if args[i].Type() != Regsub_ArgumentTypes[i] {
return errors.TypeMismatch(Regsub_Name, i+1, Regsub_ArgumentTypes[i], args[i].Type())
}
}
if !args[1].IsLiteral() {
return errors.TypeMismatch(Regsub_Name, 2, "STRING LITERAL", args[1].Type())
}
return nil
}
// Fastly built-in function implementation of regsub
// Arguments may be:
// - STRING, STRING, STRING
// Reference: https://developer.fastly.com/reference/vcl/functions/strings/regsub/
func Regsub(ctx *context.Context, args ...value.Value) (value.Value, error) {
// Argument validations
if err := Regsub_Validate(args); err != nil {
return value.Null, err
}
input := value.Unwrap[*value.String](args[0])
pattern := value.Unwrap[*value.String](args[1])
replacement := value.Unwrap[*value.String](args[2])
re, err := regexp.Compile(pattern.Value)
if err != nil {
ctx.FastlyError = &value.String{Value: "EREGRECUR"}
return &value.String{Value: input.Value}, errors.New(
Regsub_Name, "Invalid regular expression pattern: %s", pattern.Value,
)
}
expand := regsubExpandRE.ReplaceAllString(replacement.Value, regSubExpandReplace)
return &value.String{
Value: replaceOneString(re, input.Value, expand),
}, nil
}