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functions.go
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functions.go
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package functions
import (
"bytes"
"fmt"
"math"
"net/url"
"regexp"
"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"
)
var nanosPerSecond = decimal.RequireFromString("1000000000")
var nonPrintableRegex = regexp.MustCompile(`[\p{Cc}\p{C}]`)
// 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{
// type conversion
"text": OneArgFunction(Text),
"boolean": OneArgFunction(Boolean),
"number": OneArgFunction(Number),
"datetime": OneTextFunction(DateTime),
"array": Array,
// text functions
"char": OneNumberFunction(Char),
"code": OneTextFunction(Code),
"split": TwoTextFunction(Split),
"join": TwoArgFunction(Join),
"title": OneTextFunction(Title),
"word": InitialTextFunction(1, 2, Word),
"remove_first_word": OneTextFunction(RemoveFirstWord),
"word_count": InitialTextFunction(0, 1, WordCount),
"word_slice": InitialTextFunction(1, 3, WordSlice),
"field": InitialTextFunction(2, 2, Field),
"clean": OneTextFunction(Clean),
"left": TextAndIntegerFunction(Left),
"lower": OneTextFunction(Lower),
"right": TextAndIntegerFunction(Right),
"text_compare": TwoTextFunction(TextCompare),
"repeat": TextAndIntegerFunction(Repeat),
"replace": ThreeTextFunction(Replace),
"upper": OneTextFunction(Upper),
"percent": OneNumberFunction(Percent),
"url_encode": OneTextFunction(URLEncode),
// bool functions
"and": ArgCountCheck(1, -1, And),
"if": ThreeArgFunction(If),
"or": ArgCountCheck(1, -1, Or),
// number functions
"round": OneNumberAndOptionalIntegerFunction(Round, 0),
"round_up": OneNumberAndOptionalIntegerFunction(RoundUp, 0),
"round_down": OneNumberAndOptionalIntegerFunction(RoundDown, 0),
"max": ArgCountCheck(1, -1, Max),
"min": ArgCountCheck(1, -1, Min),
"mean": ArgCountCheck(1, -1, Mean),
"mod": TwoNumberFunction(Mod),
"rand": NoArgFunction(Rand),
"rand_between": TwoNumberFunction(RandBetween),
"abs": OneNumberFunction(Abs),
// datetime functions
"parse_datetime": ArgCountCheck(2, 3, ParseDateTime),
"datetime_from_parts": ArgCountCheck(3, 3, DateTimeFromParts),
"datetime_diff": DateTimeDiff,
"datetime_add": DateTimeAdd,
"weekday": OneDateTimeFunction(Weekday),
"tz": OneDateTimeFunction(TZ),
"tz_offset": OneDateTimeFunction(TZOffset),
"today": NoArgFunction(Today),
"now": NoArgFunction(Now),
"from_epoch": OneNumberFunction(FromEpoch),
"epoch": OneDateTimeFunction(Epoch),
// json functions
"json": OneArgFunction(JSON),
"parse_json": OneTextFunction(ParseJSON),
// formatting functions
"format_date": ArgCountCheck(1, 2, FormatDate),
"format_datetime": ArgCountCheck(1, 3, FormatDateTime),
"format_location": OneTextFunction(FormatLocation),
"format_number": FormatNumber,
"format_urn": FormatURN,
// utility functions
"length": OneArgFunction(Length),
"default": TwoArgFunction(Default),
"legacy_add": TwoArgFunction(LegacyAdd),
"read_chars": OneTextFunction(ReadChars),
}
//------------------------------------------------------------------------------------------
// Type Conversion Functions
//------------------------------------------------------------------------------------------
// Text tries to convert `value` to text. An error is returned if the value can't be converted.
//
// @(text(3 = 3)) -> true
// @(json(text(123.45))) -> "123.45"
// @(text(1 / 0)) -> ERROR
//
// @function text(value)
func Text(env utils.Environment, value types.XValue) types.XValue {
str, xerr := types.ToXText(env, value)
if xerr != nil {
return xerr
}
return str
}
// Boolean tries to convert `value` to a boolean. An error is returned if the value can't be converted.
//
// @(boolean(array(1, 2))) -> true
// @(boolean("FALSE")) -> false
// @(boolean(1 / 0)) -> ERROR
//
// @function boolean(value)
func Boolean(env utils.Environment, value types.XValue) types.XValue {
str, xerr := types.ToXBoolean(env, value)
if xerr != nil {
return xerr
}
return str
}
// 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(env, value)
if xerr != nil {
return xerr
}
return num
}
// DateTime turns `text` into a date according to the environment's settings. It will return an error
// if it is unable to convert the text to a date.
//
// @(datetime("1979-07-18")) -> 1979-07-18T00:00:00.000000-05:00
// @(datetime("1979-07-18T10:30:45.123456Z")) -> 1979-07-18T10:30:45.123456Z
// @(datetime("2010 05 10")) -> 2010-05-10T00:00:00.000000-05:00
// @(datetime("NOT DATE")) -> ERROR
//
// @function datetime(text)
func DateTime(env utils.Environment, str types.XText) types.XValue {
date, err := utils.DateFromString(env, str.Native())
if err != nil {
return types.NewXError(err)
}
return types.NewXDateTime(date)
}
// 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 {
// check none of our args are errors
for _, arg := range args {
if types.IsXError(arg) {
return arg
}
}
return types.NewXArray(args...)
}
//------------------------------------------------------------------------------------------
// 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 {
for _, arg := range args {
asBool, xerr := types.ToXBoolean(env, arg)
if xerr != nil {
return xerr
}
if !asBool.Native() {
return types.XBooleanFalse
}
}
return types.XBooleanTrue
}
// 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 {
for _, arg := range args {
asBool, xerr := types.ToXBoolean(env, arg)
if xerr != nil {
return xerr
}
if asBool.Native() {
return types.XBooleanTrue
}
}
return types.XBooleanFalse
}
// 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.ToXBoolean(env, test)
if err != nil {
return err
}
if asBool.Native() {
return arg1
}
return arg2
}
//------------------------------------------------------------------------------------------
// Text Functions
//------------------------------------------------------------------------------------------
// Code returns the numeric code for the first character in `text`, it is the inverse of char
//
// @(code("a")) -> 97
// @(code("abc")) -> 97
// @(code("😀")) -> 128512
// @(code("15")) -> 49
// @(code(15)) -> 49
// @(code("")) -> ERROR
//
// @function code(text)
func Code(env utils.Environment, text types.XText) types.XValue {
if text.Length() == 0 {
return types.NewXErrorf("requires a string of at least one character")
}
r, _ := utf8.DecodeRuneInString(text.Native())
return types.NewXNumberFromInt(int(r))
}
// Split splits `text` based on the characters in `delimiters`
//
// 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 d", " .|,")) -> ["a","b","c","d"]
//
// @function split(text, delimiters)
func Split(env utils.Environment, text types.XText, delimiters types.XText) types.XValue {
splits := types.NewXArray()
allSplits := utils.TokenizeStringByChars(text.Native(), delimiters.Native())
for i := range allSplits {
splits.Append(types.NewXText(allSplits[i]))
}
return splits
}
// Join joins the passed in `array` of strings with the passed in `delimiter`
//
// @(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, xerr := types.ToXText(env, delimiter)
if xerr != nil {
return xerr
}
var output bytes.Buffer
for i := 0; i < indexable.Length(); i++ {
if i > 0 {
output.WriteString(sep.Native())
}
itemAsStr, xerr := types.ToXText(env, indexable.Index(i))
if xerr != nil {
return xerr
}
output.WriteString(itemAsStr.Native())
}
return types.NewXText(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(env, num)
if xerr != nil {
return xerr
}
return types.NewXText(string(rune(code)))
}
// Title titlecases the passed in `text`, capitalizing each word
//
// @(title("foo")) -> Foo
// @(title("ryan lewis")) -> Ryan Lewis
// @(title(123)) -> 123
//
// @function title(text)
func Title(env utils.Environment, text types.XText) types.XValue {
return types.NewXText(strings.Title(text.Native()))
}
// Word returns the word at the passed in `index` for the passed in `text`. There is an optional final
// parameter `delimiters` which is string of characters used to split the text into words.
//
// @(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
// @(word("bee.*cat,dog", 1, ".*=|")) -> cat,dog
// @(word("O'Grady O'Flaggerty", 1, " ")) -> O'Flaggerty
//
// @function word(text, index [,delimiters])
func Word(env utils.Environment, text types.XText, args ...types.XValue) types.XValue {
index, xerr := types.ToInteger(env, args[0])
if xerr != nil {
return xerr
}
var words []string
if len(args) == 2 && args[1] != nil {
delimiters, xerr := types.ToXText(env, args[1])
if xerr != nil {
return xerr
}
words = utils.TokenizeStringByChars(text.Native(), delimiters.Native())
} else {
words = utils.TokenizeString(text.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.NewXText(words[offset])
}
// RemoveFirstWord removes the 1st word of `text`
//
// @(remove_first_word("foo bar")) -> bar
//
// @function remove_first_word(text)
func RemoveFirstWord(env utils.Environment, text types.XText) types.XValue {
words := utils.TokenizeString(text.Native())
if len(words) > 1 {
return types.NewXText(strings.Join(words[1:], " "))
}
return types.XTextEmpty
}
// WordSlice extracts a substring from `text` 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. There is an optional final parameter `delimiters`
// which is string of characters used to split the text into words.
//
// @(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)) ->
// @(word_slice("bee.*cat,dog", 1, -1, ".*=|,")) -> cat dog
// @(word_slice("O'Grady O'Flaggerty", 1, 2, " ")) -> O'Flaggerty
//
// @function word_slice(text, start, end [,delimiters])
func WordSlice(env utils.Environment, text types.XText, args ...types.XValue) types.XValue {
start, xerr := types.ToInteger(env, args[0])
if xerr != nil {
return xerr
}
if start < 0 {
return types.NewXErrorf("must start with a positive index")
}
end := -1
if len(args) == 2 {
if end, xerr = types.ToInteger(env, args[1]); xerr != nil {
return xerr
}
}
if end > 0 && end <= start {
return types.NewXErrorf("must have a end which is greater than the start")
}
var words []string
if len(args) == 3 && args[2] != nil {
delimiters, xerr := types.ToXText(env, args[2])
if xerr != nil {
return xerr
}
words = utils.TokenizeStringByChars(text.Native(), delimiters.Native())
} else {
words = utils.TokenizeString(text.Native())
}
if start >= len(words) {
return types.XTextEmpty
}
if end >= len(words) {
end = len(words)
}
if end > 0 {
return types.NewXText(strings.Join(words[start:end], " "))
}
return types.NewXText(strings.Join(words[start:], " "))
}
// WordCount returns the number of words in `text`. There is an optional final parameter `delimiters`
// which is string of characters used to split the text into words.
//
// @(word_count("foo bar")) -> 2
// @(word_count(10)) -> 1
// @(word_count("")) -> 0
// @(word_count("😀😃😄😁")) -> 4
// @(word_count("bee.*cat,dog", ".*=|")) -> 2
// @(word_count("O'Grady O'Flaggerty", " ")) -> 2
//
// @function word_count(text [,delimiters])
func WordCount(env utils.Environment, text types.XText, args ...types.XValue) types.XValue {
var words []string
if len(args) == 1 && args[0] != nil {
delimiters, xerr := types.ToXText(env, args[0])
if xerr != nil {
return xerr
}
words = utils.TokenizeStringByChars(text.Native(), delimiters.Native())
} else {
words = utils.TokenizeString(text.Native())
}
return types.NewXNumberFromInt(len(words))
}
// Field splits `text` 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(text, offset, delimiter)
func Field(env utils.Environment, text types.XText, args ...types.XValue) types.XValue {
field, xerr := types.ToInteger(env, args[0])
if xerr != nil {
return xerr
}
if field < 0 {
return types.NewXErrorf("cannot use a negative index to FIELD")
}
sep, xerr := types.ToXText(env, args[1])
if xerr != nil {
return xerr
}
fields := strings.Split(text.Native(), sep.Native())
if field >= len(fields) {
return types.XTextEmpty
}
// 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.NewXText(strings.TrimSpace(fields[field]))
}
// Clean strips any non-printable characters from `text`
//
// @(clean("😃 Hello \nwo\tr\rld")) -> 😃 Hello world
// @(clean(123)) -> 123
//
// @function clean(text)
func Clean(env utils.Environment, text types.XText) types.XValue {
return types.NewXText(nonPrintableRegex.ReplaceAllString(text.Native(), ""))
}
// Left returns the `count` most left characters of the passed in `text`
//
// @(left("hello", 2)) -> he
// @(left("hello", 7)) -> hello
// @(left("😀😃😄😁", 2)) -> 😀😃
// @(left("hello", -1)) -> ERROR
//
// @function left(text, count)
func Left(env utils.Environment, text types.XText, 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 text.Native() {
if i >= count {
break
}
output.WriteRune(r)
i++
}
return types.NewXText(output.String())
}
// Lower lowercases the passed in `text`
//
// @(lower("HellO")) -> hello
// @(lower("hello")) -> hello
// @(lower("123")) -> 123
// @(lower("😀")) -> 😀
//
// @function lower(text)
func Lower(env utils.Environment, text types.XText) types.XValue {
return types.NewXText(strings.ToLower(text.Native()))
}
// Right returns the `count` most right characters of the passed in `text`
//
// @(right("hello", 2)) -> lo
// @(right("hello", 7)) -> hello
// @(right("😀😃😄😁", 2)) -> 😄😁
// @(right("hello", -1)) -> ERROR
//
// @function right(text, count)
func Right(env utils.Environment, text types.XText, count int) types.XValue {
if count < 0 {
return types.NewXErrorf("can't take a negative count")
}
start := utf8.RuneCountInString(text.Native()) - count
// this weird construct does the right thing for multi-byte unicode
var output bytes.Buffer
i := 0
for _, r := range text.Native() {
if i >= start {
output.WriteRune(r)
}
i++
}
return types.NewXText(output.String())
}
// TextCompare returns the comparison between the strings `text1` and `text2`.
// 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
//
// @(text_compare("abc", "abc")) -> 0
// @(text_compare("abc", "def")) -> -1
// @(text_compare("zzz", "aaa")) -> 1
//
// @function text_compare(text1, text2)
func TextCompare(env utils.Environment, text1 types.XText, text2 types.XText) types.XValue {
return types.NewXNumberFromInt(text1.Compare(text2))
}
// Repeat return `text` repeated `count` number of times
//
// @(repeat("*", 8)) -> ********
// @(repeat("*", "foo")) -> ERROR
//
// @function repeat(text, count)
func Repeat(env utils.Environment, text types.XText, 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(text.Native())
}
return types.NewXText(output.String())
}
// Replace replaces all occurrences of `needle` with `replacement` in `text`
//
// @(replace("foo bar", "foo", "zap")) -> zap bar
// @(replace("foo bar", "baz", "zap")) -> foo bar
//
// @function replace(text, needle, replacement)
func Replace(env utils.Environment, text types.XText, needle types.XText, replacement types.XText) types.XValue {
return types.NewXText(strings.Replace(text.Native(), needle.Native(), replacement.Native(), -1))
}
// Upper uppercases all characters in the passed `text`
//
// @(upper("Asdf")) -> ASDF
// @(upper(123)) -> 123
//
// @function upper(text)
func Upper(env utils.Environment, text types.XText) types.XValue {
return types.NewXText(strings.ToUpper(text.Native()))
}
// Percent converts `num` to text represented as a percentage
//
// @(percent(0.54234)) -> 54%
// @(percent(1.2)) -> 120%
// @(percent("foo")) -> ERROR
//
// @function percent(num)
func Percent(env utils.Environment, num types.XNumber) types.XValue {
// multiply by 100 and floor
percent := num.Native().Mul(decimal.NewFromFloat(100)).Round(0)
// add on a %
return types.NewXText(fmt.Sprintf("%d%%", percent.IntPart()))
}
// URLEncode URL encodes `text` for use in a URL parameter
//
// @(url_encode("two words")) -> two+words
// @(url_encode(10)) -> 10
//
// @function url_encode(text)
func URLEncode(env utils.Environment, text types.XText) types.XValue {
return types.NewXText(url.QueryEscape(text.Native()))
}
//------------------------------------------------------------------------------------------
// Number 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 {
max, xerr := types.ToXNumber(env, args[0])
if xerr != nil {
return xerr
}
for _, v := range args[1:] {
val, xerr := types.ToXNumber(env, 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 {
max, xerr := types.ToXNumber(env, args[0])
if xerr != nil {
return xerr
}
for _, v := range args[1:] {
val, xerr := types.ToXNumber(env, 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 {
sum := decimal.Zero
for _, val := range args {
num, xerr := types.ToXNumber(env, 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)
}
//------------------------------------------------------------------------------------------
// Date & Time Functions
//------------------------------------------------------------------------------------------
// ParseDateTime turns `text` into a date according to the `format` and optional `timezone` specified
//
// The format string can consist of the following characters. The characters
// ' ', ':', ',', 'T', '-' and '_' are ignored. Any other character is an error.
//
// * `YY` - last two digits of year 0-99
// * `YYYY` - four digits of year 0000-9999
// * `M` - month 1-12
// * `MM` - month 01-12
// * `D` - day of month, 1-31
// * `DD` - day of month, zero padded 0-31
// * `h` - hour of the day 1-12
// * `hh` - hour of the day 01-12
// * `tt` - twenty four hour of the day 01-23
// * `m` - minute 0-59
// * `mm` - minute 00-59
// * `s` - second 0-59
// * `ss` - second 00-59
// * `fff` - milliseconds
// * `ffffff` - microseconds
// * `fffffffff` - nanoseconds
// * `aa` - am or pm
// * `AA` - AM or PM
// * `Z` - hour and minute offset from UTC, or Z for UTC
// * `ZZZ` - hour and minute offset from UTC
//
// Timezone should be a location name as specified in the IANA Time Zone database, such
// as "America/Guayaquil" or "America/Los_Angeles". If not specified the timezone of your
// environment will be used. An error will be returned if the timezone is not recognized.
//
// Note that fractional seconds will be parsed even without an explicit format identifier.
// You should only specify fractional seconds when you want to assert the number of places
// in the input format.
//
// parse_datetime will return an error if it is unable to convert the text to a datetime.
//
// @(parse_datetime("1979-07-18", "YYYY-MM-DD")) -> 1979-07-18T00:00:00.000000-05:00
// @(parse_datetime("2010 5 10", "YYYY M DD")) -> 2010-05-10T00:00:00.000000-05:00
// @(parse_datetime("2010 5 10 12:50", "YYYY M DD tt:mm", "America/Los_Angeles")) -> 2010-05-10T12:50:00.000000-07:00
// @(parse_datetime("NOT DATE", "YYYY-MM-DD")) -> ERROR
//
// @function parse_datetime(text, format [,timezone])
func ParseDateTime(env utils.Environment, args ...types.XValue) types.XValue {
str, xerr := types.ToXText(env, args[0])
if xerr != nil {
return xerr
}
format, xerr := types.ToXText(env, args[1])
if xerr != nil {
return xerr
}
// try to turn it to a go format
goFormat, err := utils.ToGoDateFormat(format.Native(), utils.DateTimeFormatting)
if err != nil {
return types.NewXError(err)
}
// grab our location
location := env.Timezone()
if len(args) == 3 {
tzStr, xerr := types.ToXText(env, args[2])
if xerr != nil {
return xerr
}
location, err = time.LoadLocation(tzStr.Native())
if err != nil {
return types.NewXError(err)
}
}
// finally try to parse the date
parsed, err := time.ParseInLocation(goFormat, str.Native(), location)
if err != nil {
return types.NewXError(err)
}
return types.NewXDateTime(parsed.In(location))
}
// DateTimeFromParts converts the passed in `year`, `month` and `day`
//
// @(datetime_from_parts(2017, 1, 15)) -> 2017-01-15T00:00:00.000000-05:00
// @(datetime_from_parts(2017, 2, 31)) -> 2017-03-03T00:00:00.000000-05:00
// @(datetime_from_parts(2017, 13, 15)) -> ERROR
//
// @function datetime_from_parts(year, month, day)
func DateTimeFromParts(env utils.Environment, args ...types.XValue) types.XValue {
year, xerr := types.ToInteger(env, args[0])
if xerr != nil {
return xerr
}
month, xerr := types.ToInteger(env, args[1])
if xerr != nil {
return xerr
}
if month < 1 || month > 12 {
return types.NewXErrorf("invalid value for month, must be 1-12")
}
day, xerr := types.ToInteger(env, args[2])
if xerr != nil {
return xerr
}
return types.NewXDateTime(time.Date(year, time.Month(month), day, 0, 0, 0, 0, env.Timezone()))
}
// DateTimeDiff returns the integer duration between `date1` and `date2` in the `unit` specified.
//
// Valid durations are "Y" for years, "M" for months, "W" for weeks, "D" for days, "h" for hour,