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FunctionMap.go
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FunctionMap.go
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// =================================================================
//
// Copyright (C) 2019 Spatial Current, Inc. - All Rights Reserved
// Released as open source under the MIT License. See LICENSE file.
//
// =================================================================
package dfl
import (
"reflect"
"regexp"
"strings"
"github.com/pkg/errors"
"gopkg.in/russross/blackfriday.v2"
"github.com/spatialcurrent/go-adaptive-functions/pkg/af"
"github.com/spatialcurrent/go-reader-writer/pkg/io"
"github.com/spatialcurrent/go-simple-serializer/pkg/gss"
)
// FunctionMap is a map of functions by string that are reference by name in the Function Node.
type FunctionMap map[string]func(FunctionMap, map[string]interface{}, interface{}, []interface{}, []string) (interface{}, error)
func NewFuntionMapWithDefaults() FunctionMap {
funcs := FunctionMap{}
for _, fn := range af.Functions {
for _, alias := range fn.Aliases {
funcs[alias] = func(fn af.Function) func(funcs FunctionMap, vars map[string]interface{}, ctx interface{}, args []interface{}, quotes []string) (interface{}, error) {
return func(funcs FunctionMap, vars map[string]interface{}, ctx interface{}, args []interface{}, quotes []string) (interface{}, error) {
out, err := fn.ValidateRun(args...)
if err != nil {
return Null{}, errors.Wrap(err, "Invalid arguments")
}
return out, nil
}
}(fn)
}
}
funcs["parse"] = func(funcs FunctionMap, vars map[string]interface{}, ctx interface{}, args []interface{}, quotes []string) (interface{}, error) {
if len(args) != 2 {
return 0, errors.New("Invalid number of arguments to parse.")
}
str, ok := args[0].(string)
if !ok {
return 0, errors.New("Invalid arguments to parse.")
}
f, ok := args[1].(string)
if !ok {
return 0, errors.New("Invalid arguments to parse.")
}
t, err := gss.GetType([]byte(str), f)
if err != nil {
return "", errors.Wrap(err, "error creating new object for format "+f)
}
return gss.DeserializeBytes(&gss.DeserializeBytesInput{
Bytes: []byte(str),
Type: t,
Format: f,
Header: []interface{}{},
Comment: "",
SkipLines: 0,
Limit: -1,
})
}
funcs["md"] = func(funcs FunctionMap, vars map[string]interface{}, ctx interface{}, args []interface{}, quotes []string) (interface{}, error) {
if len(args) != 1 {
return 0, errors.New("Invalid number of arguments to md.")
}
switch s := args[0].(type) {
case string:
unsafe := strings.TrimSpace(string(blackfriday.Run(
[]byte(s),
blackfriday.WithExtensions(blackfriday.NoExtensions),
blackfriday.WithRenderer(blackfriday.NewHTMLRenderer(blackfriday.HTMLRendererParameters{
Flags: blackfriday.HTMLFlagsNone,
})),
)))
if strings.HasPrefix(unsafe, "<p>") && strings.HasSuffix(unsafe, "</p>") {
unsafe = unsafe[3 : len(unsafe)-4]
}
return unsafe, nil
}
return Null{}, errors.New("Invalid argument of type " + reflect.TypeOf(args[0]).String())
}
funcs["filter"] = filterArray
funcs["group"] = groupArray
funcs["map"] = mapArray
//funcs["sort"] = sortArray
funcs["dict"] = toDict
funcs["hist"] = histArray
funcs["prefix"] = prefix
funcs["suffix"] = suffix
funcs["trim"] = trimString
funcs["ltrim"] = trimStringLeft
funcs["rtrim"] = trimStringRight
funcs["slugify"] = func(funcs FunctionMap, vars map[string]interface{}, ctx interface{}, args []interface{}, quotes []string) (interface{}, error) {
if len(args) < 2 {
return 0, errors.New("Invalid number of arguments to slugify.")
}
switch s := args[0].(type) {
case string:
switch replacement := args[1].(type) {
case string:
reg, err := regexp.Compile("[^a-zA-Z0-9]+")
if err != nil {
return Null{}, errors.Wrap(err, "Invalid regular expression ")
}
return reg.ReplaceAllString(strings.ToLower(s), replacement), nil
}
}
return Null{}, errors.New("Invalid argument of type " + reflect.TypeOf(args[0]).String())
}
funcs["first"] = func(funcs FunctionMap, vars map[string]interface{}, ctx interface{}, args []interface{}, quotes []string) (interface{}, error) {
if v, ok := args[0].(io.ByteReadCloser); ok {
return v.ReadFirst()
}
return af.First.ValidateRun(args)
}
funcs["last"] = func(funcs FunctionMap, vars map[string]interface{}, ctx interface{}, args []interface{}, quotes []string) (interface{}, error) {
if v, ok := args[0].(io.ByteReadCloser); ok {
b, err := v.ReadAll()
if err != nil {
return byte(0), err
}
if len(b) == 0 {
return byte(0), errors.New("last cannot run on an empty io.ByteReadCloser")
}
return b[len(b)-1], nil
}
return af.Last.ValidateRun(args)
}
return funcs
}
var DefaultFunctionMap = NewFuntionMapWithDefaults()