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package dasel
import (
"fmt"
"reflect"
"strings"
)
type ErrUnknownFunction struct {
Function string
}
func (e ErrUnknownFunction) Error() string {
return fmt.Sprintf("unknown function: %s", e.Function)
}
func (e ErrUnknownFunction) Is(other error) bool {
_, ok := other.(*ErrUnknownFunction)
return ok
}
type ErrUnexpectedFunctionArgs struct {
Function string
Args []string
Message string
}
func (e ErrUnexpectedFunctionArgs) Error() string {
return fmt.Sprintf("unexpected function args: %s(%s): %s", e.Function, strings.Join(e.Args, ", "), e.Message)
}
func (e ErrUnexpectedFunctionArgs) Is(other error) bool {
o, ok := other.(*ErrUnexpectedFunctionArgs)
if !ok {
return false
}
if o.Function != "" && o.Function != e.Function {
return false
}
if o.Message != "" && o.Message != e.Message {
return false
}
if o.Args != nil && !reflect.DeepEqual(o.Args, e.Args) {
return false
}
return true
}
func standardFunctions() *FunctionCollection {
collection := &FunctionCollection{}
collection.Add(
// Generic
ThisFunc,
LenFunc,
KeyFunc,
KeysFunc,
MergeFunc,
CountFunc,
MapOfFunc,
TypeFunc,
JoinFunc,
StringFunc,
NullFunc,
// Selectors
IndexFunc,
AllFunc,
FirstFunc,
LastFunc,
PropertyFunc,
AppendFunc,
OrDefaultFunc,
// Filters
FilterFunc,
FilterOrFunc,
// Comparisons
EqualFunc,
MoreThanFunc,
LessThanFunc,
AndFunc,
OrFunc,
NotFunc,
// Metadata
MetadataFunc,
ParentFunc,
)
return collection
}
// SelectorFunc is a function that can be executed in a selector.
type SelectorFunc func(c *Context, step *Step, args []string) (Values, error)
type FunctionCollection struct {
functions []Function
}
func (fc *FunctionCollection) ParseSelector(part string) *Selector {
for _, f := range fc.functions {
if s := f.AlternativeSelector(part); s != nil {
return s
}
}
return nil
}
func (fc *FunctionCollection) Add(fs ...Function) {
fc.functions = append(fc.functions, fs...)
}
func (fc *FunctionCollection) GetAll() map[string]SelectorFunc {
res := make(map[string]SelectorFunc)
for _, f := range fc.functions {
res[f.Name()] = f.Run
}
return res
}
func (fc *FunctionCollection) Get(name string) (SelectorFunc, error) {
if f, ok := fc.GetAll()[name]; ok {
return f, nil
}
return nil, &ErrUnknownFunction{Function: name}
}
type Function interface {
Name() string
Run(c *Context, s *Step, args []string) (Values, error)
AlternativeSelector(part string) *Selector
}
type BasicFunction struct {
name string
runFn func(c *Context, s *Step, args []string) (Values, error)
alternativeSelectorFn func(part string) *Selector
}
func (bf BasicFunction) Name() string {
return bf.name
}
func (bf BasicFunction) Run(c *Context, s *Step, args []string) (Values, error) {
return bf.runFn(c, s, args)
}
func (bf BasicFunction) AlternativeSelector(part string) *Selector {
if bf.alternativeSelectorFn == nil {
return nil
}
return bf.alternativeSelectorFn(part)
}
func requireNoArgs(name string, args []string) error {
if len(args) > 0 {
return &ErrUnexpectedFunctionArgs{
Function: name,
Args: args,
Message: "0 arguments expected",
}
}
return nil
}
func requireExactlyXArgs(name string, args []string, x int) error {
if len(args) != x {
return &ErrUnexpectedFunctionArgs{
Function: name,
Args: args,
Message: fmt.Sprintf("exactly %d arguments expected", x),
}
}
return nil
}
func requireXOrMoreArgs(name string, args []string, x int) error {
if len(args) < x {
return &ErrUnexpectedFunctionArgs{
Function: name,
Args: args,
Message: fmt.Sprintf("expected %d or more arguments", x),
}
}
return nil
}
func requireXOrLessArgs(name string, args []string, x int) error {
if len(args) > x {
return &ErrUnexpectedFunctionArgs{
Function: name,
Args: args,
Message: fmt.Sprintf("expected %d or less arguments", x),
}
}
return nil
}
func requireModulusXArgs(name string, args []string, x int) error {
if len(args)%x != 0 {
return &ErrUnexpectedFunctionArgs{
Function: name,
Args: args,
Message: fmt.Sprintf("expected arguments in groups of %d", x),
}
}
return nil
}
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