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functions.go
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functions.go
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package functions
import (
"bytes"
"fmt"
"math"
"net/url"
"strings"
"time"
"unicode/utf8"
"github.com/nyaruka/gocommon/urns"
"github.com/nyaruka/goflow/excellent/types"
"github.com/nyaruka/goflow/utils"
humanize "github.com/dustin/go-humanize"
"github.com/shopspring/decimal"
)
// XFunction defines the interface that Excellent functions must implement
type XFunction func(env utils.Environment, args ...types.XValue) types.XValue
// RegisterXFunction registers a new function in Excellent
func RegisterXFunction(name string, function XFunction) {
XFUNCTIONS[name] = function
}
// XFUNCTIONS is our map of functions available in Excellent which aren't tests
var XFUNCTIONS = map[string]XFunction{
"and": And,
"if": ThreeArgFunction(If),
"or": Or,
"length": OneArgFunction(Length),
"default": TwoArgFunction(Default),
"array": Array,
"legacy_add": TwoArgFunction(LegacyAdd),
"number": OneArgFunction(Number),
"round": OneNumberAndOptionalIntegerFunction(Round, 0),
"round_up": OneNumberAndOptionalIntegerFunction(RoundUp, 0),
"round_down": OneNumberAndOptionalIntegerFunction(RoundDown, 0),
"max": Max,
"min": Min,
"mean": Mean,
"mod": TwoNumberFunction(Mod),
"rand": NoArgFunction(Rand),
"rand_between": TwoNumberFunction(RandBetween),
"abs": OneNumberFunction(Abs),
"format_num": FormatNum,
"read_code": OneStringFunction(ReadCode),
"json": OneArgFunction(JSON),
"parse_json": OneStringFunction(ParseJSON),
"url_encode": OneStringFunction(URLEncode),
"char": OneNumberFunction(Char),
"code": OneStringFunction(Code),
"split": TwoStringFunction(Split),
"join": TwoArgFunction(Join),
"title": OneStringFunction(Title),
"word": StringAndIntegerFunction(Word),
"remove_first_word": OneStringFunction(RemoveFirstWord),
"word_count": OneStringFunction(WordCount),
"word_slice": ArgCountCheck(2, 3, WordSlice),
"field": Field,
"clean": OneStringFunction(Clean),
"left": StringAndIntegerFunction(Left),
"lower": OneStringFunction(Lower),
"right": StringAndIntegerFunction(Right),
"string_cmp": TwoStringFunction(StringCmp),
"repeat": StringAndIntegerFunction(Repeat),
"replace": ThreeStringFunction(Replace),
"upper": OneStringFunction(Upper),
"percent": OneNumberFunction(Percent),
"format_date": FormatDate,
"parse_date": ParseDate,
"date": OneStringFunction(Date),
"date_from_parts": DateFromParts,
"date_diff": DateDiff,
"date_add": DateAdd,
"weekday": OneDateFunction(Weekday),
"tz": OneDateFunction(TZ),
"tz_offset": OneDateFunction(TZOffset),
"today": NoArgFunction(Today),
"now": NoArgFunction(Now),
"from_epoch": OneNumberFunction(FromEpoch),
"to_epoch": OneDateFunction(ToEpoch),
"format_urn": FormatURN,
}
//------------------------------------------------------------------------------------------
// Legacy Functions
//------------------------------------------------------------------------------------------
// LegacyAdd simulates our old + operator, which operated differently based on whether
// one of the parameters was a date or not. If one is a date, then the other side is
// expected to be an integer with a number of days to add to the date, otherwise a normal
// decimal addition is attempted.
func LegacyAdd(env utils.Environment, arg1 types.XValue, arg2 types.XValue) types.XValue {
// try to parse dates and decimals
date1, date1Err := types.ToXDate(env, arg1)
date2, date2Err := types.ToXDate(env, arg2)
dec1, dec1Err := types.ToXNumber(arg1)
dec2, dec2Err := types.ToXNumber(arg2)
// if they are both dates, that's an error
if date1Err == nil && date2Err == nil {
return types.NewXErrorf("cannot operate on two dates")
}
// date and int, do a day addition
if date1Err == nil && dec2Err == nil {
if dec2.Native().IntPart() < math.MinInt32 || dec2.Native().IntPart() > math.MaxInt32 {
return types.NewXErrorf("cannot operate on integers greater than 32 bit")
}
return types.NewXDate(date1.Native().AddDate(0, 0, int(dec2.Native().IntPart())))
}
// int and date, do a day addition
if date2Err == nil && dec1Err == nil {
if dec1.Native().IntPart() < math.MinInt32 || dec1.Native().IntPart() > math.MaxInt32 {
return types.NewXErrorf("cannot operate on integers greater than 32 bit")
}
return types.NewXDate(date2.Native().AddDate(0, 0, int(dec1.Native().IntPart())))
}
// one of these doesn't look like a valid decimal either, bail
if dec1Err != nil {
return types.NewXError(dec1Err)
}
if dec2Err != nil {
return types.NewXError(dec2Err)
}
// normal decimal addition
return types.NewXNumber(dec1.Native().Add(dec2.Native()))
}
//------------------------------------------------------------------------------------------
// Utility Functions
//------------------------------------------------------------------------------------------
// Length returns the length of the passed in string or array.
//
// length will return an error if it is passed an item which doesn't have length.
//
// @(length("Hello")) -> 5
// @(length("😀😃😄😁")) -> 4
// @(length(array())) -> 0
// @(length(array("a", "b", "c"))) -> 3
// @(length(1234)) -> ERROR
//
// @function length(value)
func Length(env utils.Environment, value types.XValue) types.XValue {
// argument must be a value with length
lengthable, isLengthable := value.(types.XLengthable)
if isLengthable {
return types.NewXNumberFromInt(lengthable.Length())
}
return types.NewXErrorf("value doesn't have length")
}
// Default takes two arguments, returning `test` if not an error or nil, otherwise returning `default`
//
// @(default(undeclared.var, "default_value")) -> default_value
// @(default("10", "20")) -> 10
// @(default(date("invalid-date"), "today")) -> today
//
// @function default(test, default)
func Default(env utils.Environment, test types.XValue, def types.XValue) types.XValue {
// first argument is nil, return arg2
if utils.IsNil(test) {
return def
}
// test whether arg1 is an error
_, isErr := test.(types.XError)
if isErr {
return def
}
return test
}
// Array takes a list of `values` and returns them as an array
//
// @(array("a", "b", 356)[1]) -> b
// @(join(array("a", "b", "c"), "|")) -> a|b|c
// @(length(array())) -> 0
// @(length(array("a", "b"))) -> 2
//
// @function array(values...)
func Array(env utils.Environment, args ...types.XValue) types.XValue {
return types.NewXArray(args...)
}
// Number tries to convert `value` to a number. An error is returned if the value can't be converted.
//
// @(number(10)) -> 10
// @(number("123.45000")) -> 123.45
// @(number("what?")) -> ERROR
//
// @function number(value)
func Number(env utils.Environment, value types.XValue) types.XValue {
num, xerr := types.ToXNumber(value)
if xerr != nil {
return xerr
}
return num
}
// ParseJSON tries to parse `string` as JSON, returning a fragment you can index into
//
// If the passed in value is not JSON, then an error is returned
//
// @(parse_json("[1,2,3,4]").2) -> 3
// @(parse_json("invalid json")) -> ERROR
//
// @function parse_json(string)
func ParseJSON(env utils.Environment, str types.XString) types.XValue {
return types.JSONToXValue([]byte(str.Native()))
}
// JSON tries to return a JSON representation of `value`. An error is returned if there is
// no JSON representation of that object.
//
// @(json("string")) -> "string"
// @(json(10)) -> 10
// @(json(contact.uuid)) -> "5d76d86b-3bb9-4d5a-b822-c9d86f5d8e4f"
//
// @function json(value)
func JSON(env utils.Environment, value types.XValue) types.XValue {
asJSON, xerr := types.ToXJSON(value)
if xerr != nil {
return xerr
}
return asJSON
}
// URLEncode URL encodes `string` for use in a URL parameter
//
// @(url_encode("two words")) -> two+words
// @(url_encode(10)) -> 10
//
// @function url_encode(string)
func URLEncode(env utils.Environment, str types.XString) types.XValue {
return types.NewXString(url.QueryEscape(str.Native()))
}
//------------------------------------------------------------------------------------------
// Bool Functions
//------------------------------------------------------------------------------------------
// And returns whether all the passed in arguments are truthy
//
// @(and(true)) -> true
// @(and(true, false, true)) -> false
//
// @function and(tests...)
func And(env utils.Environment, args ...types.XValue) types.XValue {
if len(args) == 0 {
return types.NewXErrorf("requires at least one argument")
}
for _, arg := range args {
asBool, err := types.ToXBool(arg)
if err != nil {
return err
}
if !asBool.Native() {
return types.XBoolFalse
}
}
return types.XBoolTrue
}
// Or returns whether if any of the passed in arguments are truthy
//
// @(or(true)) -> true
// @(or(true, false, true)) -> true
//
// @function or(tests...)
func Or(env utils.Environment, args ...types.XValue) types.XValue {
if len(args) == 0 {
return types.NewXErrorf("requires at least one argument")
}
for _, arg := range args {
asBool, err := types.ToXBool(arg)
if err != nil {
return err
}
if asBool.Native() {
return types.XBoolTrue
}
}
return types.XBoolFalse
}
// If evaluates the `test` argument, and if truthy returns `true_value`, if not returning `false_value`
//
// If the first argument is an error that error is returned
//
// @(if(1 = 1, "foo", "bar")) -> foo
// @(if("foo" > "bar", "foo", "bar")) -> ERROR
//
// @function if(test, true_value, false_value)
func If(env utils.Environment, test types.XValue, arg1 types.XValue, arg2 types.XValue) types.XValue {
asBool, err := types.ToXBool(test)
if err != nil {
return err
}
if asBool.Native() {
return arg1
}
return arg2
}
//------------------------------------------------------------------------------------------
// Decimal Functions
//------------------------------------------------------------------------------------------
// Abs returns the absolute value of `num`
//
// @(abs(-10)) -> 10
// @(abs(10.5)) -> 10.5
// @(abs("foo")) -> ERROR
//
// @function abs(num)
func Abs(env utils.Environment, num types.XNumber) types.XValue {
return types.NewXNumber(num.Native().Abs())
}
// Round rounds `num` to the nearest value. You can optionally pass in the number of decimal places to round to as `places`.
//
// If places < 0, it will round the integer part to the nearest 10^(-places).
//
// @(round(12)) -> 12
// @(round(12.141)) -> 12
// @(round(12.6)) -> 13
// @(round(12.141, 2)) -> 12.14
// @(round(12.146, 2)) -> 12.15
// @(round(12.146, -1)) -> 10
// @(round("notnum", 2)) -> ERROR
//
// @function round(num [,places])
func Round(env utils.Environment, num types.XNumber, places int) types.XValue {
return types.NewXNumber(num.Native().Round(int32(places)))
}
// RoundUp rounds `num` up to the nearest integer value. You can optionally pass in the number of decimal places to round to as `places`.
//
// @(round_up(12)) -> 12
// @(round_up(12.141)) -> 13
// @(round_up(12.6)) -> 13
// @(round_up(12.141, 2)) -> 12.15
// @(round_up(12.146, 2)) -> 12.15
// @(round_up("foo")) -> ERROR
//
// @function round_up(num [,places])
func RoundUp(env utils.Environment, num types.XNumber, places int) types.XValue {
dec := num.Native()
if dec.Round(int32(places)).Equal(dec) {
return num
}
halfPrecision := decimal.New(5, -int32(places)-1)
roundedDec := dec.Add(halfPrecision).Round(int32(places))
return types.NewXNumber(roundedDec)
}
// RoundDown rounds `num` down to the nearest integer value. You can optionally pass in the number of decimal places to round to as `places`.
//
// @(round_down(12)) -> 12
// @(round_down(12.141)) -> 12
// @(round_down(12.6)) -> 12
// @(round_down(12.141, 2)) -> 12.14
// @(round_down(12.146, 2)) -> 12.14
// @(round_down("foo")) -> ERROR
//
// @function round_down(num [,places])
func RoundDown(env utils.Environment, num types.XNumber, places int) types.XValue {
dec := num.Native()
if dec.Round(int32(places)).Equal(dec) {
return num
}
halfPrecision := decimal.New(5, -int32(places)-1)
roundedDec := dec.Sub(halfPrecision).Round(int32(places))
return types.NewXNumber(roundedDec)
}
// Max takes a list of `values` and returns the greatest of them
//
// @(max(1, 2)) -> 2
// @(max(1, -1, 10)) -> 10
// @(max(1, 10, "foo")) -> ERROR
//
// @function max(values...)
func Max(env utils.Environment, args ...types.XValue) types.XValue {
if len(args) == 0 {
return types.NewXErrorf("takes at least one argument")
}
max, xerr := types.ToXNumber(args[0])
if xerr != nil {
return xerr
}
for _, v := range args[1:] {
val, xerr := types.ToXNumber(v)
if xerr != nil {
return xerr
}
if val.Compare(max) > 0 {
max = val
}
}
return max
}
// Min takes a list of `values` and returns the smallest of them
//
// @(min(1, 2)) -> 1
// @(min(2, 2, -10)) -> -10
// @(min(1, 2, "foo")) -> ERROR
//
// @function min(values)
func Min(env utils.Environment, args ...types.XValue) types.XValue {
if len(args) == 0 {
return types.NewXErrorf("takes at least one argument")
}
max, xerr := types.ToXNumber(args[0])
if xerr != nil {
return xerr
}
for _, v := range args[1:] {
val, xerr := types.ToXNumber(v)
if xerr != nil {
return xerr
}
if val.Compare(max) < 0 {
max = val
}
}
return max
}
// Mean takes a list of `values` and returns the arithmetic mean of them
//
// @(mean(1, 2)) -> 1.5
// @(mean(1, 2, 6)) -> 3
// @(mean(1, "foo")) -> ERROR
//
// @function mean(values)
func Mean(env utils.Environment, args ...types.XValue) types.XValue {
if len(args) == 0 {
return types.NewXErrorf("requires at least one argument")
}
sum := decimal.Zero
for _, val := range args {
num, xerr := types.ToXNumber(val)
if xerr != nil {
return xerr
}
sum = sum.Add(num.Native())
}
return types.NewXNumber(sum.Div(decimal.New(int64(len(args)), 0)))
}
// Mod returns the remainder of the division of `divident` by `divisor`
//
// @(mod(5, 2)) -> 1
// @(mod(4, 2)) -> 0
// @(mod(5, "foo")) -> ERROR
//
// @function mod(dividend, divisor)
func Mod(env utils.Environment, num1 types.XNumber, num2 types.XNumber) types.XValue {
return types.NewXNumber(num1.Native().Mod(num2.Native()))
}
// Rand returns a single random number between [0.0-1.0).
//
// @(rand()) -> 0.3849275689214193274523267973563633859157562255859375
// @(rand()) -> 0.607552015674623913099594574305228888988494873046875
//
// @function rand()
func Rand(env utils.Environment) types.XValue {
return types.NewXNumber(utils.RandDecimal())
}
// RandBetween a single random integer in the given inclusive range.
//
// @(rand_between(1, 10)) -> 5
// @(rand_between(1, 10)) -> 10
//
// @function rand_between()
func RandBetween(env utils.Environment, min types.XNumber, max types.XNumber) types.XValue {
span := (max.Native().Sub(min.Native())).Add(decimal.New(1, 0))
val := utils.RandDecimal().Mul(span).Add(min.Native()).Floor()
return types.NewXNumber(val)
}
// FormatNum returns `num` formatted with the passed in number of decimal `places` and optional `commas` dividing thousands separators
//
// @(format_num(31337)) -> 31,337.00
// @(format_num(31337, 2)) -> 31,337.00
// @(format_num(31337, 2, true)) -> 31,337.00
// @(format_num(31337, 0, false)) -> 31337
// @(format_num("foo", 2, false)) -> ERROR
//
// @function format_num(num, places, commas)
func FormatNum(env utils.Environment, args ...types.XValue) types.XValue {
if len(args) < 1 || len(args) > 3 {
return types.NewXErrorf("takes 1 to 3 arguments, got %d", len(args))
}
num, err := types.ToXNumber(args[0])
if err != nil {
return err
}
places := 2
if len(args) > 1 {
if places, err = types.ToInteger(args[1]); err != nil {
return err
}
if places < 0 || places > 9 {
return types.NewXErrorf("must take 0-9 number of places, got %d", args[1])
}
}
commas := types.XBoolTrue
if len(args) > 2 {
if commas, err = types.ToXBool(args[2]); err != nil {
return err
}
}
// build our format string
formatStr := bytes.Buffer{}
if commas.Native() {
formatStr.WriteString("#,###.")
} else {
formatStr.WriteString("####.")
}
if places > 0 {
for i := 0; i < places; i++ {
formatStr.WriteString("#")
}
}
f64, _ := num.Native().Float64()
return types.NewXString(humanize.FormatFloat(formatStr.String(), f64))
}
//------------------------------------------------------------------------------------------
// IVR Functions
//------------------------------------------------------------------------------------------
// ReadCode converts `code` into something that can be read by IVR systems
//
// ReadCode will split the numbers such as they are easier to understand. This includes
// splitting in 3s or 4s if appropriate.
//
// @(read_code("1234")) -> 1 2 3 4
// @(read_code("abc")) -> a b c
// @(read_code("abcdef")) -> a b c , d e f
//
// @function read_code(code)
func ReadCode(env utils.Environment, val types.XString) types.XValue {
var output bytes.Buffer
// remove any leading +
val = types.NewXString(strings.TrimLeft(val.Native(), "+"))
length := val.Length()
// groups of three
if length%3 == 0 {
// groups of 3
for i := 0; i < length; i += 3 {
if i > 0 {
output.WriteString(" , ")
}
output.WriteString(strings.Join(strings.Split(val.Native()[i:i+3], ""), " "))
}
return types.NewXString(output.String())
}
// groups of four
if length%4 == 0 {
for i := 0; i < length; i += 4 {
if i > 0 {
output.WriteString(" , ")
}
output.WriteString(strings.Join(strings.Split(val.Native()[i:i+4], ""), " "))
}
return types.NewXString(output.String())
}
// default, just do one at a time
for i, c := range val.Native() {
if i > 0 {
output.WriteString(" , ")
}
output.WriteRune(c)
}
return types.NewXString(output.String())
}
//------------------------------------------------------------------------------------------
// String Functions
//------------------------------------------------------------------------------------------
// Code returns the numeric code for the first character in `string`, it is the inverse of char
//
// @(code("a")) -> 97
// @(code("abc")) -> 97
// @(code("😀")) -> 128512
// @(code("15")) -> 49
// @(code(15)) -> 49
// @(code("")) -> ERROR
//
// @function code(string)
func Code(env utils.Environment, str types.XString) types.XValue {
if str.Length() == 0 {
return types.NewXErrorf("requires a string of at least one character")
}
r, _ := utf8.DecodeRuneInString(str.Native())
return types.NewXNumberFromInt(int(r))
}
// Split splits `string` based on the passed in `delimeter`
//
// Empty values are removed from the returned list
//
// @(split("a b c", " ")) -> ["a","b","c"]
// @(split("a", " ")) -> ["a"]
// @(split("abc..d", ".")) -> ["abc","d"]
// @(split("a.b.c.", ".")) -> ["a","b","c"]
// @(split("a && b && c", " && ")) -> ["a","b","c"]
//
// @function split(string, delimiter)
func Split(env utils.Environment, s types.XString, sep types.XString) types.XValue {
splits := types.NewXArray()
allSplits := strings.Split(s.Native(), sep.Native())
for i := range allSplits {
if allSplits[i] != "" {
splits.Append(types.NewXString(allSplits[i]))
}
}
return splits
}
// Join joins the passed in `array` of strings with the passed in `delimeter`
//
// @(join(array("a", "b", "c"), "|")) -> a|b|c
// @(join(split("a.b.c", "."), " ")) -> a b c
//
// @function join(array, delimiter)
func Join(env utils.Environment, array types.XValue, delimiter types.XValue) types.XValue {
indexable, isIndexable := array.(types.XIndexable)
if !isIndexable {
return types.NewXErrorf("requires an indexable as its first argument")
}
sep, err := types.ToXString(delimiter)
if err != nil {
return err
}
var output bytes.Buffer
for i := 0; i < indexable.Length(); i++ {
if i > 0 {
output.WriteString(sep.Native())
}
itemAsStr, err := types.ToXString(indexable.Index(i))
if err != nil {
return err
}
output.WriteString(itemAsStr.Native())
}
return types.NewXString(output.String())
}
// Char returns the rune for the passed in codepoint, `num`, which may be unicode, this is the reverse of code
//
// @(char(33)) -> !
// @(char(128512)) -> 😀
// @(char("foo")) -> ERROR
//
// @function char(num)
func Char(env utils.Environment, num types.XNumber) types.XValue {
code, xerr := types.ToInteger(num)
if xerr != nil {
return xerr
}
return types.NewXString(string(rune(code)))
}
// Title titlecases the passed in `string`, capitalizing each word
//
// @(title("foo")) -> Foo
// @(title("ryan lewis")) -> Ryan Lewis
// @(title(123)) -> 123
//
// @function title(string)
func Title(env utils.Environment, str types.XString) types.XValue {
return types.NewXString(strings.Title(str.Native()))
}
// Word returns the word at the passed in `index` for the passed in `string`
//
// @(word("bee cat dog", 0)) -> bee
// @(word("bee.cat,dog", 0)) -> bee
// @(word("bee.cat,dog", 1)) -> cat
// @(word("bee.cat,dog", 2)) -> dog
// @(word("bee.cat,dog", -1)) -> dog
// @(word("bee.cat,dog", -2)) -> cat
//
// @function word(string, index)
func Word(env utils.Environment, str types.XString, index int) types.XValue {
words := utils.TokenizeString(str.Native())
offset := index
if offset < 0 {
offset += len(words)
}
if !(offset >= 0 && offset < len(words)) {
return types.NewXErrorf("index %d is out of range for the number of words %d", index, len(words))
}
return types.NewXString(words[offset])
}
// RemoveFirstWord removes the 1st word of `string`
//
// @(remove_first_word("foo bar")) -> bar
//
// @function remove_first_word(string)
func RemoveFirstWord(env utils.Environment, str types.XString) types.XValue {
words := utils.TokenizeString(str.Native())
if len(words) > 1 {
return types.NewXString(strings.Join(words[1:], " "))
}
return types.XStringEmpty
}
// WordSlice extracts a substring from `string` spanning from `start` up to but not-including `end`. (first word is 0). A negative
// end value means that all words after the start should be returned.
//
// @(word_slice("bee cat dog", 0, 1)) -> bee
// @(word_slice("bee cat dog", 0, 2)) -> bee cat
// @(word_slice("bee cat dog", 1, -1)) -> cat dog
// @(word_slice("bee cat dog", 1)) -> cat dog
// @(word_slice("bee cat dog", 2, 3)) -> dog
// @(word_slice("bee cat dog", 3, 10)) ->
//
// @function word_slice(string, start, end)
func WordSlice(env utils.Environment, args ...types.XValue) types.XValue {
str, xerr := types.ToXString(args[0])
if xerr != nil {
return xerr
}
start, xerr := types.ToInteger(args[1])
if xerr != nil {
return xerr
}
if start < 0 {
return types.NewXErrorf("must start with a positive index")
}
end := -1
if len(args) == 3 {
if end, xerr = types.ToInteger(args[2]); xerr != nil {
return xerr
}
}
if end > 0 && end <= start {
return types.NewXErrorf("must have a end which is greater than the start")
}
words := utils.TokenizeString(str.Native())
if start >= len(words) {
return types.XStringEmpty
}
if end >= len(words) {
end = len(words)
}
if end > 0 {
return types.NewXString(strings.Join(words[start:end], " "))
}
return types.NewXString(strings.Join(words[start:], " "))
}
// WordCount returns the number of words in `string`
//
// @(word_count("foo bar")) -> 2
// @(word_count(10)) -> 1
// @(word_count("")) -> 0
// @(word_count("😀😃😄😁")) -> 4
//
// @function word_count(string)
func WordCount(env utils.Environment, str types.XString) types.XValue {
words := utils.TokenizeString(str.Native())
return types.NewXNumberFromInt(len(words))
}
// Field splits `string` based on the passed in `delimiter` and returns the field at `offset`. When splitting
// with a space, the delimiter is considered to be all whitespace. (first field is 0)
//
// @(field("a,b,c", 1, ",")) -> b
// @(field("a,,b,c", 1, ",")) ->
// @(field("a b c", 1, " ")) -> b
// @(field("a b c d", 1, " ")) ->
// @(field("a\t\tb\tc\td", 1, " ")) ->
// @(field("a,b,c", "foo", ",")) -> ERROR
//
// @function field(string, offset, delimeter)
func Field(env utils.Environment, args ...types.XValue) types.XValue {
source, xerr := types.ToXString(args[0])
if xerr != nil {
return xerr
}
field, xerr := types.ToInteger(args[1])
if xerr != nil {
return xerr
}
if field < 0 {
return types.NewXErrorf("cannot use a negative index to FIELD")
}
sep, xerr := types.ToXString(args[2])
if xerr != nil {
return xerr
}
fields := strings.Split(source.Native(), sep.Native())
if field >= len(fields) {
return types.XStringEmpty
}
// when using a space as a delimiter, we consider it splitting on whitespace, so remove empty values
if sep.Native() == " " {
var newFields []string
for _, field := range fields {
if field != "" {
newFields = append(newFields, field)
}
}
fields = newFields
}
return types.NewXString(strings.TrimSpace(fields[field]))
}
// Clean strips any leading or trailing whitespace from `string``
//
// @(clean("\nfoo\t")) -> foo
// @(clean(" bar")) -> bar
// @(clean(123)) -> 123
//
// @function clean(string)
func Clean(env utils.Environment, str types.XString) types.XValue {
return types.NewXString(strings.TrimSpace(str.Native()))
}
// Left returns the `count` most left characters of the passed in `string`
//
// @(left("hello", 2)) -> he
// @(left("hello", 7)) -> hello
// @(left("😀😃😄😁", 2)) -> 😀😃
// @(left("hello", -1)) -> ERROR
//
// @function left(string, count)
func Left(env utils.Environment, str types.XString, count int) types.XValue {
if count < 0 {
return types.NewXErrorf("can't take a negative count")
}
// this weird construct does the right thing for multi-byte unicode
var output bytes.Buffer
i := 0
for _, r := range str.Native() {
if i >= count {
break
}
output.WriteRune(r)
i++
}
return types.NewXString(output.String())
}
// Lower lowercases the passed in `string`
//
// @(lower("HellO")) -> hello
// @(lower("hello")) -> hello
// @(lower("123")) -> 123
// @(lower("😀")) -> 😀
//
// @function lower(string)
func Lower(env utils.Environment, str types.XString) types.XValue {
return types.NewXString(strings.ToLower(str.Native()))
}
// Right returns the `count` most right characters of the passed in `string`
//
// @(right("hello", 2)) -> lo
// @(right("hello", 7)) -> hello
// @(right("😀😃😄😁", 2)) -> 😄😁
// @(right("hello", -1)) -> ERROR
//
// @function right(string, count)
func Right(env utils.Environment, str types.XString, count int) types.XValue {
if count < 0 {
return types.NewXErrorf("can't take a negative count")
}
start := utf8.RuneCountInString(str.Native()) - count
// this weird construct does the right thing for multi-byte unicode
var output bytes.Buffer
i := 0
for _, r := range str.Native() {
if i >= start {
output.WriteRune(r)
}
i++
}
return types.NewXString(output.String())
}
// StringCmp returns the comparison between the strings `str1` and `str2`.
// The return value will be -1 if str1 is smaller than str2, 0 if they
// are equal and 1 if str1 is greater than str2
//
// @(string_cmp("abc", "abc")) -> 0
// @(string_cmp("abc", "def")) -> -1
// @(string_cmp("zzz", "aaa")) -> 1
//
// @function string_cmp(str1, str2)
func StringCmp(env utils.Environment, str1 types.XString, str2 types.XString) types.XValue {
return types.NewXNumberFromInt(str1.Compare(str2))
}
// Repeat return `string` repeated `count` number of times
//
// @(repeat("*", 8)) -> ********
// @(repeat("*", "foo")) -> ERROR
//
// @function repeat(string, count)
func Repeat(env utils.Environment, str types.XString, count int) types.XValue {
if count < 0 {
return types.NewXErrorf("must be called with a positive integer, got %d", count)
}
var output bytes.Buffer
for j := 0; j < count; j++ {
output.WriteString(str.Native())
}
return types.NewXString(output.String())
}
// Replace replaces all occurrences of `needle` with `replacement` in `string`