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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
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How to Apply These Terms to Your New Programs
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Also add information on how to contact you by electronic and paper mail.
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The hypothetical commands 'show w' and 'show c' should show the appropriate
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For more information on this, and how to apply and follow the GNU GPL, see
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The GNU General Public License does not permit incorporating your program
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the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<http://www.gnu.org/philosophy/why-not-lgpl.html>.

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# taf
This is a library that parses and decodes [TAF forecasts](https://en.wikipedia.org/wiki/Terminal_aerodrome_forecast).
TAF stands for Terminal Aerodrome Forecast. It's the weather forecast format used in aviation. TAF reports are useful as a free source of accurate weather.
Here's an example of a TAF report from JFK airport:
```
KJFK 212335Z 2200/2306 33012G18KT P6SM FEW060 BKN250
FM220300 36014KT P6SM FEW060 SCT150
FM221400 01015G21KT P6SM SCT060
FM221900 04011KT P6SM SCT060
FM230000 03007KT P6SM FEW060
FM230300 35006KT P6SM FEW060
```
Try parsing it by installing the tafparser tool using
```bash
go install go.elara.ws/taf/cmd/tafparser@latest
```
and then running
```bash
tafparser <<EOF
KJFK 212335Z 2200/2306 33012G18KT P6SM FEW060 BKN250
FM220300 36014KT P6SM FEW060 SCT150
FM221400 01015G21KT P6SM SCT060
FM221900 04011KT P6SM SCT060
FM230000 03007KT P6SM FEW060
FM230300 35006KT P6SM FEW060
EOF
```
That should return a JSON object containing all the decoded data from the TAF report.
You can also give the `tafparser` tool a file to read from using `tafparser file.txt`.
Units in TAF reports are inconsistent between different countries. `tafparser` can convert the units for you! Just pass it the units you want to use for speed and/or distance like so:
```bash
tafparser -s m/s -d m
```
This tells `tafparser` to convert all speed units to meters per second and distance units to meters.

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package main
import (
"encoding/json"
"os"
"github.com/alecthomas/repr"
"github.com/spf13/pflag"
"go.elara.ws/logger"
"go.elara.ws/logger/log"
"go.elara.ws/taf"
"go.elara.ws/taf/units"
)
func init() {
log.Logger = logger.NewPretty(os.Stderr)
}
func main() {
pretty := pflag.BoolP("pretty", "p", true, "Pretty-print the JSON output")
printGo := pflag.BoolP("print-go", "G", false, "Print Go code instead of JSON")
convertDist := pflag.StringP("convert-distance", "d", "", "Convert all the distances to the given unit. (valid units: sm, mi, m)")
convertSpd := pflag.StringP("convert-speed", "s", "", "Convert all the speeds to the given unit. (valid units: m/s, mps, kmh, kph, kt, kts)")
pflag.Parse()
var opts taf.Options
if *convertDist != "" {
d, ok := units.ParseDistance(*convertDist)
if !ok {
log.Fatal("Invalid distance unit").Send()
}
opts.DistanceUnit = d
}
if *convertSpd != "" {
s, ok := units.ParseSpeed(*convertSpd)
if !ok {
log.Fatal("Invalid speed unit").Send()
}
opts.SpeedUnit = s
}
var fl *os.File
var err error
if pflag.NArg() > 0 {
fl, err = os.Open(pflag.Arg(0))
if err != nil {
log.Fatal("Error opening file").Err(err).Send()
}
} else {
fl = os.Stdin
}
fc, err := taf.ParseWithOptions(fl, opts)
if err != nil {
log.Fatal("Error parsing TAF data").Err(err).Send()
}
if *printGo {
repr.Println(fc)
} else {
enc := json.NewEncoder(os.Stdout)
if *pretty {
enc.SetIndent("", " ")
}
err = enc.Encode(fc)
if err != nil {
log.Fatal("Error encoding forecast").Err(err).Send()
}
}
}

17
go.mod Normal file
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module go.elara.ws/taf
go 1.21.0
require (
github.com/alecthomas/participle/v2 v2.0.0
github.com/alecthomas/repr v0.2.0
github.com/spf13/pflag v1.0.5
go.elara.ws/logger v0.0.0-20230421022458-e80700db2090
)
require (
github.com/gookit/color v1.5.1 // indirect
github.com/mattn/go-isatty v0.0.14 // indirect
github.com/xo/terminfo v0.0.0-20210125001918-ca9a967f8778 // indirect
golang.org/x/sys v0.0.0-20210927094055-39ccf1dd6fa6 // indirect
)

33
go.sum Normal file
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@ -0,0 +1,33 @@
github.com/alecthomas/assert/v2 v2.2.2 h1:Z/iVC0xZfWTaFNE6bA3z07T86hd45Xe2eLt6WVy2bbk=
github.com/alecthomas/assert/v2 v2.2.2/go.mod h1:pXcQ2Asjp247dahGEmsZ6ru0UVwnkhktn7S0bBDLxvQ=
github.com/alecthomas/participle/v2 v2.0.0 h1:Fgrq+MbuSsJwIkw3fEj9h75vDP0Er5JzepJ0/HNHv0g=
github.com/alecthomas/participle/v2 v2.0.0/go.mod h1:rAKZdJldHu8084ojcWevWAL8KmEU+AT+Olodb+WoN2Y=
github.com/alecthomas/repr v0.2.0 h1:HAzS41CIzNW5syS8Mf9UwXhNH1J9aix/BvDRf1Ml2Yk=
github.com/alecthomas/repr v0.2.0/go.mod h1:Fr0507jx4eOXV7AlPV6AVZLYrLIuIeSOWtW57eE/O/4=
github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/gookit/color v1.5.1 h1:Vjg2VEcdHpwq+oY63s/ksHrgJYCTo0bwWvmmYWdE9fQ=
github.com/gookit/color v1.5.1/go.mod h1:wZFzea4X8qN6vHOSP2apMb4/+w/orMznEzYsIHPaqKM=
github.com/hexops/gotextdiff v1.0.3 h1:gitA9+qJrrTCsiCl7+kh75nPqQt1cx4ZkudSTLoUqJM=
github.com/hexops/gotextdiff v1.0.3/go.mod h1:pSWU5MAI3yDq+fZBTazCSJysOMbxWL1BSow5/V2vxeg=
github.com/mattn/go-isatty v0.0.14 h1:yVuAays6BHfxijgZPzw+3Zlu5yQgKGP2/hcQbHb7S9Y=
github.com/mattn/go-isatty v0.0.14/go.mod h1:7GGIvUiUoEMVVmxf/4nioHXj79iQHKdU27kJ6hsGG94=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.7.2/go.mod h1:R6va5+xMeoiuVRoj+gSkQ7d3FALtqAAGI1FQKckRals=
github.com/stretchr/testify v1.8.0 h1:pSgiaMZlXftHpm5L7V1+rVB+AZJydKsMxsQBIJw4PKk=
github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
github.com/xo/terminfo v0.0.0-20210125001918-ca9a967f8778 h1:QldyIu/L63oPpyvQmHgvgickp1Yw510KJOqX7H24mg8=
github.com/xo/terminfo v0.0.0-20210125001918-ca9a967f8778/go.mod h1:2MuV+tbUrU1zIOPMxZ5EncGwgmMJsa+9ucAQZXxsObs=
go.elara.ws/logger v0.0.0-20230421022458-e80700db2090 h1:RVC8XvWo6Yw4HUshqx4TSzuBDScDghafU6QFRJ4xPZg=
go.elara.ws/logger v0.0.0-20230421022458-e80700db2090/go.mod h1:qng49owViqsW5Aey93lwBXONw20oGbJIoLVscB16mPM=
golang.org/x/sys v0.0.0-20210330210617-4fbd30eecc44/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.0.0-20210927094055-39ccf1dd6fa6 h1:foEbQz/B0Oz6YIqu/69kfXPYeFQAuuMYFkjaqXzl5Wo=
golang.org/x/sys v0.0.0-20210927094055-39ccf1dd6fa6/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

20
internal/parser/lexer.go Normal file
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package parser
import (
"github.com/alecthomas/participle/v2/lexer"
)
var lex = lexer.MustSimple([]lexer.SimpleRule{
{Name: "header", Pattern: `TAF (AMD|COR)? ?`},
{Name: "Remark", Pattern: `RMK .*`},
{Name: "Number", Pattern: `\d+`},
{Name: "Modifier", Pattern: `[+-]|VC`},
{Name: "Prob", Pattern: "PROB"},
{Name: "Slash", Pattern: `/`},
{Name: "Descriptor", Pattern: `MI|BC|DR|BL|SH|TS|FZ|PR`},
{Name: "Precip", Pattern: `DZ|RA|SN|SG|IC|PL|GR|GS|UP`},
{Name: "Obscur", Pattern: "BR|FG|FU|DU|SA|HZ|PY|VA"},
{Name: "Phenom", Pattern: "PO|SQ|FC|SS|DS"},
{Name: "Ident", Pattern: `[A-Z]+`},
{Name: "WS", Pattern: `[ \t\n\r]+`},
})

98
internal/parser/parser.go Normal file
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package parser
import (
"github.com/alecthomas/participle/v2"
"github.com/alecthomas/participle/v2/lexer"
)
type AST struct {
Items []*Item `@@*`
}
type Item struct {
Pos lexer.Position
Time *string `( @Number "Z" WS`
Valid *ValidPair ` @@`
Probability *Probability `| @@`
Change *Change `| @@`
WindSpeed *WindSpeed `| @@`
Visibility *Visibility `| @@`
SkyCondition *SkyCondition `| @@`
Vicinity *Vicinity `| @@`
Weather *Weather `| @@`
Temperature *Temperature `| @@`
Flag *Flag `| @@`
Remark *string `| @Remark`
ID *string `| @Ident ) WS?`
}
type ValidPair struct {
Pos lexer.Position
Start string `@Number "/"`
End string `@Number`
}
type Probability struct {
Pos lexer.Position
Value string `Prob @Number`
Time string `(WS @Number)?`
}
type WindSpeed struct {
Pos lexer.Position
WindShear string `("WS" @Number "/")?`
Variable bool `@"VRB"?`
Value string `@Number`
Gusts string `("G" @Number)?`
Unit string `@("MPS"|"KMH"|"KT")`
}
type Visibility struct {
Pos lexer.Position
Plus bool `@"P"?`
Value string `@Number @WS? @(Number? "/" Number)?`
Unit string `@"SM"?`
}
type SkyCondition struct {
Pos lexer.Position
Type string `@("FEW"|"SCT"|"BKN"|"OVC"|"VV"|"SKC")`
Altitude string `@Number?`
CloudType string `@("CB"|"TCU")?`
}
type Vicinity struct {
Pos lexer.Position
Descriptor string `"VC" ( @Descriptor`
Precipitation string ` | @Precip )`
}
type Weather struct {
Pos lexer.Position
Modifier string `@Modifier?`
Descriptor string `@Descriptor?`
Precipitation string ` ( @Precip`
Obscuration string ` | @Obscur`
Other string ` | @Phenom )`
}
type Change struct {
Pos lexer.Position
Type string `@("FM"|"BECMG"|"TEMPO")`
Time string `@Number?`
Valid *ValidPair `WS? @@?`
}
type Temperature struct {
Pos lexer.Position
Type string `@("TX"|"TN")`
Value string `@Number "/"`
Time string `@Number "Z"`
}
type Flag struct {
Pos lexer.Position
CAVOK bool `@"CAVOK"`
}
var Parser = participle.MustBuild[AST](participle.Lexer(lex))

363
taf.go Normal file
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package taf
import (
"io"
"io/fs"
"math/big"
"os"
"reflect"
"strconv"
"strings"
"time"
"github.com/alecthomas/participle/v2"
"go.elara.ws/taf/internal/parser"
"go.elara.ws/taf/units"
)
// ParseString parses a TAF string and returns a Forecast.
// This is equivalent to Parse(strings.NewReader(s)).
func ParseString(s string) (*Forecast, error) {
return Parse(strings.NewReader(s))
}
// ParseFile parses a TAF string and returns a Forecast.
// This is equivalent to opening a file and passing it
// to Parse().
func ParseFile(path string) (*Forecast, error) {
fl, err := os.Open(path)
if err != nil {
return nil, err
}
defer fl.Close()
return Parse(fl)
}
// Parse parses the data in a reader using default options and
// returns a Forecast
func Parse(r io.Reader) (*Forecast, error) {
return ParseWithOptions(r, Options{})
}
// Options contains options for the parser
type Options struct {
// If this is set, all distance units in the forecast
// will be converted to the given unit
DistanceUnit units.Distance
// If this is set, all speed units in the forecast will
// be converted to the given unit
SpeedUnit units.Speed
}
// ParseWithOptions parses the data in a reader and returns a Forecast
func ParseWithOptions(r io.Reader, opts Options) (*Forecast, error) {
filename := "unknown"
switch r := r.(type) {
case *os.File:
filename = r.Name()
case fs.File:
fi, err := r.Stat()
if err == nil {
filename = fi.Name()
}
case *strings.Reader:
filename = "string"
}
ast, err := parser.Parser.Parse(filename, r)
if err != nil {
return nil, err
}
fc := &Forecast{}
out := reflect.ValueOf(fc).Elem()
for _, item := range ast.Items {
switch {
case item.ID != nil:
setField(out, "Identifier", *item.ID)
case item.Time != nil:
t, err := parseTime(*item.Time)
if err != nil {
return nil, participle.Errorf(item.Pos, "time: %s", err)
}
setField(out, "PublishTime", t)
// The Time item always comes with a Valid as well because
// of the way it's parsed into the AST
vp, err := parseValid(item.Valid)
if err != nil {
return nil, participle.Errorf(item.Pos, "time: %s", err)
}
setField(out, "Valid", vp)
case item.Weather != nil:
appendField(out, "Weather", Weather{
Modifier: Modifier(item.Weather.Modifier),
Descriptor: Descriptor(item.Weather.Descriptor),
Precipitation: Precipitation(item.Weather.Precipitation),
Obscuration: Obscuration(item.Weather.Obscuration),
Phenomenon: Phenomenon(item.Weather.Other),
})
case item.Vicinity != nil:
appendField(out, "Weather", Weather{
Vicinity: true,
Descriptor: Descriptor(item.Vicinity.Descriptor),
Precipitation: Precipitation(item.Vicinity.Precipitation),
})
case item.SkyCondition != nil:
altitude, err := strconv.Atoi(item.SkyCondition.Altitude)
if err != nil {
return nil, participle.Errorf(item.SkyCondition.Pos, "sky: %s", err)
}
appendField(out, "SkyCondition", SkyCondition{
Altitude: altitude * 100, // Scale factor for altitude is 100
Type: SkyConditionType(item.SkyCondition.Type),
CloudType: CloudType(item.SkyCondition.CloudType),
})
case item.Temperature != nil:
vt, err := parseValidTime(item.Temperature.Time)
if err != nil {
return nil, participle.Errorf(item.Temperature.Pos, "temp: %s", err)
}
val, err := strconv.Atoi(item.Temperature.Value)
if err != nil {
return nil, participle.Errorf(item.Temperature.Pos, "temp: %s", err)
}
appendField(out, "Temperature", Temperature{
Type: TemperatureType(item.Temperature.Type),
Time: vt,
Value: val,
})
case item.Visibility != nil:
// This value may have a space at the end if there's no unit
item.Visibility.Value = strings.TrimSpace(item.Visibility.Value)
// Create a new rational number
ratNum := new(big.Rat)
// If there's a space, this is a mixed number, split it at the space
if before, after, ok := strings.Cut(item.Visibility.Value, " "); ok {
// Set the rational number to the fraction of the mixed number
ratNum, ok = ratNum.SetString(after)
if !ok {
return nil, participle.Errorf(item.Visibility.Pos, "visibility: invalid fraction %q", after)
}
// Create a new rational number and set it to the whole part of
// the mixed number
add, ok := new(big.Rat).SetString(before)
if !ok {
return nil, participle.Errorf(item.Visibility.Pos, "visibility: invalid whole number %q", before)
}
// Add the whole part to the fractional part
ratNum = ratNum.Add(ratNum, add)
} else {
// There's no space, so this is just a fraction or a whole number.
// Just set the rational number to the whole string.
ratNum, ok = ratNum.SetString(before)
if !ok {
return nil, participle.Errorf(item.Visibility.Pos, "visibility: invalid fraction %q", after)
}
}
// If there's no unit, set the unit to meters
if item.Visibility.Unit == "" {
item.Visibility.Unit = "M"
}
unit := units.Distance(item.Visibility.Unit)
val, _ := ratNum.Float64()
if opts.DistanceUnit != "" {
val = unit.Convert(opts.DistanceUnit, val)
unit = opts.DistanceUnit
}
setField(out, "Visibility", Visibility{
Plus: item.Visibility.Plus,
Value: val,
Unit: unit,
})
case item.WindSpeed != nil:
var direction int
// If the wind speed is variable, there's no direction to worry about
if !item.WindSpeed.Variable {
// The length of the value must be at least 5 (3 characters for direction and 2 for speed)
if len(item.WindSpeed.Value) < 5 {
return nil, participle.Errorf(item.WindSpeed.Pos, "wind: invalid length (%d)", len(item.WindSpeed.Value))
}
// First three characters are the direction
direction, err = strconv.Atoi(item.WindSpeed.Value[:3])
if err != nil {
return nil, participle.Errorf(item.WindSpeed.Pos, "wind: %s", err)
}
// Set the value to the last two characters so it can be processed
// as just a speed.
item.WindSpeed.Value = item.WindSpeed.Value[3:]
// The direction is in degrees so it may not go above 360 or below 0
if direction > 360 || direction < 0 {
return nil, participle.Errorf(item.WindSpeed.Pos, "wind: invalid direction (%d)", direction)
}
}
// If there was a direction, it was removed above, so now we can just
// get the speed by parsing the string
speed, err := strconv.Atoi(item.WindSpeed.Value)
if err != nil {
return nil, participle.Errorf(item.WindSpeed.Pos, "wind: %s", err)
}
var gusts int
if item.WindSpeed.Gusts != "" {
gusts, err = strconv.Atoi(item.WindSpeed.Gusts)
if err != nil {
return nil, participle.Errorf(item.WindSpeed.Pos, "wind: %s", err)
}
}
var windshear int
if item.WindSpeed.WindShear != "" {
windshear, err = strconv.Atoi(item.WindSpeed.WindShear)
if err != nil {
return nil, participle.Errorf(item.WindSpeed.Pos, "wind: %s", err)
}
}
unit := units.Speed(item.WindSpeed.Unit)
if opts.SpeedUnit != "" {
speed = unit.Convert(opts.SpeedUnit, speed)
if gusts != 0 {
gusts = unit.Convert(opts.SpeedUnit, gusts)
}
unit = opts.SpeedUnit
}
setField(out, "Wind", Wind{
Gusts: gusts,
Speed: speed,
WindShear: windshear * 100, // Scale factor for altitude is 100
Direction: Direction{
Variable: item.WindSpeed.Variable,
Value: direction,
},
Unit: unit,
})
case item.Flag != nil:
switch {
case item.Flag.CAVOK:
appendField(out, "Flags", CeilingAndVisibilityOK)
}
case item.Change != nil:
ch := &Change{
Type: ChangeType(item.Change.Type),
}
// FM changes don't have a valid pair, they only come with a single time string
if ch.Type == From {
t, err := parseTime(item.Change.Time)
if err != nil {
return nil, participle.Errorf(item.Change.Pos, "changes: %s", err)
}
ch.Valid = ValidPair{From: t}
} else {
vp, err := parseValid(item.Change.Valid)
if err != nil {
return nil, participle.Errorf(item.Change.Pos, "changes: %s", err)
}
ch.Valid = vp
}
fc.Changes = append(fc.Changes, ch)
// Set out to the change value so that future mutations
// happen to the change rather than the root forecast.
out = reflect.ValueOf(ch).Elem()
case item.Probability != nil:
// If the time is empty, this probability belongs to the
// previous change.
if item.Probability.Time == "" {
prob, err := strconv.Atoi(item.Probability.Value)
if err != nil {
return nil, participle.Errorf(item.Probability.Pos, "prob: %s", err)
}
setField(out, "Probability", prob)
} else {
pr := &Probability{}
// The probability time string must have 4 characters,
// 2 for starting time and 2 for ending time
if len(item.Probability.Time) < 4 {
return nil, participle.Errorf(item.Probability.Pos, "prob: invalid time %q", item.Probability.Time)
}
startStr := item.Probability.Time[:2]
endStr := item.Probability.Time[2:]
start, err := strconv.Atoi(startStr)
if err != nil {
return nil, participle.Errorf(item.Probability.Pos, "prob: %s", err)
}
end, err := strconv.Atoi(endStr)
if err != nil {
return nil, participle.Errorf(item.Probability.Pos, "prob: %s", err)
}
t := fc.PublishTime
pr.Valid = ValidPair{
From: time.Date(t.Year(), t.Month(), t.Day(), start, 0, 0, 0, time.UTC),
To: time.Date(t.Year(), t.Month(), t.Day(), end, 0, 0, 0, time.UTC),
}
// Get the duration by subtracting the from time from the to time
pr.Valid.Duration = pr.Valid.To.Sub(pr.Valid.From)
fc.Probabilities = append(fc.Probabilities, pr)
// Set out to the probability value so that future mutations
// happen to the probability rather than the root forecast.
out = reflect.ValueOf(pr).Elem()
}
}
}
return fc, nil
}
// setField sets a field of a struct to a value.
//
// This is used to allow mutations to happen on either
// the root forecast or a change or probability. It makes it
// easier to handle the different types.
func setField(rv reflect.Value, name string, to any) {
rv.FieldByName(name).Set(reflect.ValueOf(to))
}
// appendField appends a value to a slice in the field of a struct.
//
// This is used to allow mutations to happen on either
// the root forecast or a change or probability. It makes it
// easier to handle the different types.
func appendField(rv reflect.Value, name string, items ...any) {
f := rv.FieldByName(name)
f.Set(reflect.Append(f, anyToValues(items)...))
}
// anyToValues converts a slice of any type to a slice
// of reflect values.
func anyToValues(items []any) []reflect.Value {
out := make([]reflect.Value, len(items))
for i, item := range items {
out[i] = reflect.ValueOf(item)
}
return out
}

626
taf_test.go Normal file
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@ -0,0 +1,626 @@
package taf
import (
"reflect"
"strings"
"testing"
"time"
"go.elara.ws/taf/units"
)
func TestKLAX(t *testing.T) {
const data = `KLAX 212011Z 2120/2224 26012KT P6SM FEW035 SCT050 SCT060
FM212200 25010KT P6SM SCT040
FM220300 VRB03KT P6SM BKN025
FM221000 VRB03KT P6SM OVC025
FM221700 26006KT P6SM BKN025
FM222000 26012KT P6SM SCT030`
expected := &Forecast{
Identifier: "KLAX",
PublishTime: time.Date(2023, time.September, 21, 20, 11, 0, 0, time.UTC),
Valid: ValidPair{
From: time.Date(2023, time.September, 21, 20, 0, 0, 0, time.UTC),
To: time.Date(2023, time.September, 23, 0, 0, 0, 0, time.UTC),
Duration: time.Duration(100800000000000),
},
Visibility: Visibility{
Plus: true,
Value: 6,
Unit: units.StatuteMiles,
},
Wind: Wind{
Direction: Direction{
Value: 260,
},
Speed: 12,
Unit: units.Knots,
},
SkyCondition: []SkyCondition{
{
Type: Few,
Altitude: 3500,
},
{
Type: Scattered,
Altitude: 5000,
},
{
Type: Scattered,
Altitude: 6000,
},
},
Changes: []*Change{
{
Type: From,
Valid: ValidPair{
From: time.Date(2023, time.September, 21, 22, 0, 0, 0, time.UTC),
},
Visibility: Visibility{
Plus: true,
Value: 6,
Unit: units.StatuteMiles,
},
Wind: Wind{
Direction: Direction{
Value: 250,
},
Speed: 10,
Unit: units.Knots,
},
SkyCondition: []SkyCondition{
{
Type: Scattered,
Altitude: 4000,
},
},
},
{
Type: From,
Valid: ValidPair{
From: time.Date(2023, time.September, 22, 3, 0, 0, 0, time.UTC),
},
Visibility: Visibility{
Plus: true,
Value: 6,
Unit: units.StatuteMiles,
},
Wind: Wind{
Direction: Direction{
Variable: true,
},
Speed: 3,
Unit: units.Knots,
},
SkyCondition: []SkyCondition{
{
Type: Broken,
Altitude: 2500,
},
},
},
{
Type: From,
Valid: ValidPair{
From: time.Date(2023, time.September, 22, 10, 0, 0, 0, time.UTC),
},
Visibility: Visibility{
Plus: true,
Value: 6,
Unit: units.StatuteMiles,
},
Wind: Wind{
Direction: Direction{
Variable: true,
},
Speed: 3,
Unit: units.Knots,
},
SkyCondition: []SkyCondition{
{
Type: Overcast,
Altitude: 2500,
},
},
},
{
Type: From,
Valid: ValidPair{
From: time.Date(2023, time.September, 22, 17, 0, 0, 0, time.UTC),
},
Visibility: Visibility{
Plus: true,
Value: 6,
Unit: units.StatuteMiles,
},
Wind: Wind{
Direction: Direction{
Value: 260,
},
Speed: 6,
Unit: units.Knots,
},
SkyCondition: []SkyCondition{
{
Type: Broken,
Altitude: 2500,
},
},
},
{
Type: From,
Valid: ValidPair{
From: time.Date(2023, time.September, 22, 20, 0, 0, 0, time.UTC),
},
Visibility: Visibility{
Plus: true,
Value: 6,
Unit: units.StatuteMiles,
},
Wind: Wind{
Direction: Direction{
Value: 260,
},
Speed: 12,
Unit: units.Knots,
},
SkyCondition: []SkyCondition{
{
Type: Scattered,
Altitude: 3000,
},
},
},
},
}
fc, err := Parse(strings.NewReader(data))
if err != nil {
t.Fatalf("Error during parsing: %s", err)
}
if !reflect.DeepEqual(fc, expected) {
t.Errorf("Output does not match expected")
}
}
func TestZGSZ(t *testing.T) {
const data = `TAF AMD ZGSZ 211907Z 2118/2218 18004MPS 8000 SCT020 TX32/2206Z TN28/2122Z
TEMPO 2120/2202 SHRA SCT020 FEW023CB
TEMPO 2204/2208 TSRA SCT020 FEW023CB`
expected := &Forecast{
Identifier: "ZGSZ",
PublishTime: time.Date(2023, time.September, 21, 19, 7, 0, 0, time.UTC),
Valid: ValidPair{
From: time.Date(2023, time.September, 21, 18, 0, 0, 0, time.UTC),
To: time.Date(2023, time.September, 22, 18, 0, 0, 0, time.UTC),
Duration: time.Duration(86400000000000),
},
Visibility: Visibility{
Value: 8000,
Unit: units.Meters,
},
Wind: Wind{
Direction: Direction{
Value: 180,
},
Speed: 4,
Unit: units.MetersPerSecond,
},
SkyCondition: []SkyCondition{
{
Type: Scattered,
Altitude: 2000,
},
},
Temperature: []Temperature{
{
Type: High,
Value: 32,
Time: time.Date(2023, time.September, 22, 6, 0, 0, 0, time.UTC),
},
{
Type: Low,
Value: 28,
Time: time.Date(2023, time.September, 21, 22, 0, 0, 0, time.UTC),
},
},
Changes: []*Change{
{
Type: Temporary,
Valid: ValidPair{
From: time.Date(2023, time.September, 21, 20, 0, 0, 0, time.UTC),
To: time.Date(2023, time.September, 22, 2, 0, 0, 0, time.UTC),
Duration: time.Duration(21600000000000),
},
SkyCondition: []SkyCondition{
{
Type: Scattered,
Altitude: 2000,
},
{
Type: Few,
Altitude: 2300,
CloudType: CumuloNimbus,
},
},
Weather: []Weather{
{
Descriptor: Showers,
Precipitation: Rain,
},
},
},
{
Type: Temporary,
Valid: ValidPair{
From: time.Date(2023, time.September, 22, 4, 0, 0, 0, time.UTC),
To: time.Date(2023, time.September, 22, 8, 0, 0, 0, time.UTC),
Duration: time.Duration(14400000000000),
},
SkyCondition: []SkyCondition{
{
Type: Scattered,
Altitude: 2000,
},
{
Type: Few,
Altitude: 2300,
CloudType: CumuloNimbus,
},
},
Weather: []Weather{
{
Descriptor: Thunderstorm,
Precipitation: Rain,
},
},
},
},
}
fc, err := Parse(strings.NewReader(data))
if err != nil {
t.Fatalf("Error during parsing: %s", err)
}
if !reflect.DeepEqual(fc, expected) {
t.Errorf("Output does not match expected")
}
}
func TestLFBD(t *testing.T) {
const data = `TAF LFBD 211700Z 2118/2224 31010KT CAVOK TX37/2214Z TN22/2205Z
BECMG 2118/2120 32004KT
BECMG 2200/2202 26005KT
BECMG 2213/2215 32010KT
BECMG 2222/2224 24004KT`
expected := &Forecast{
Identifier: "LFBD",
PublishTime: time.Date(2023, time.September, 21, 17, 0, 0, 0, time.UTC),
Valid: ValidPair{
From: time.Date(2023, time.September, 21, 18, 0, 0, 0, time.UTC),
To: time.Date(2023, time.September, 23, 0, 0, 0, 0, time.UTC),
Duration: time.Duration(108000000000000),
},
Wind: Wind{
Direction: Direction{
Value: 310,
},
Speed: 10,
Unit: units.Knots,
},
Temperature: []Temperature{
{
Type: High,
Value: 37,
Time: time.Date(2023, time.September, 22, 14, 0, 0, 0, time.UTC),
},
{
Type: Low,
Value: 22,
Time: time.Date(2023, time.September, 22, 5, 0, 0, 0, time.UTC),
},
},
Changes: []*Change{
{
Type: Becoming,
Valid: ValidPair{
From: time.Date(2023, time.September, 21, 18, 0, 0, 0, time.UTC),
To: time.Date(2023, time.September, 21, 20, 0, 0, 0, time.UTC),
Duration: time.Duration(7200000000000),
},
Wind: Wind{
Direction: Direction{
Value: 320,
},
Speed: 4,
Unit: units.Knots,
},
},
{
Type: Becoming,
Valid: ValidPair{
From: time.Date(2023, time.September, 22, 0, 0, 0, 0, time.UTC),
To: time.Date(2023, time.September, 22, 2, 0, 0, 0, time.UTC),
Duration: time.Duration(7200000000000),
},
Wind: Wind{
Direction: Direction{
Value: 260,
},
Speed: 5,
Unit: units.Knots,
},
},
{
Type: Becoming,
Valid: ValidPair{
From: time.Date(2023, time.September, 22, 13, 0, 0, 0, time.UTC),
To: time.Date(2023, time.September, 22, 15, 0, 0, 0, time.UTC),
Duration: time.Duration(7200000000000),
},
Wind: Wind{
Direction: Direction{
Value: 320,
},
Speed: 10,
Unit: units.Knots,
},
},
{
Type: Becoming,
Valid: ValidPair{
From: time.Date(2023, time.September, 22, 22, 0, 0, 0, time.UTC),
To: time.Date(2023, time.September, 23, 0, 0, 0, 0, time.UTC),
Duration: time.Duration(7200000000000),
},
Wind: Wind{
Direction: Direction{
Value: 240,
},
Speed: 4,
Unit: units.Knots,
},
},
},
Flags: []Flag{
CeilingAndVisibilityOK,
},
}
fc, err := Parse(strings.NewReader(data))
if err != nil {
t.Fatalf("Error during parsing: %s", err)
}
if !reflect.DeepEqual(fc, expected) {
t.Errorf("Output does not match expected")
}
}
func TestUUEE(t *testing.T) {
const data = `TAF UUEE 211958Z 2121/2221 VRB01MPS 9999 SCT030 TX20/2212Z TN12/2202Z
TEMPO 2121/2204 BKN004
PROB40
TEMPO 2121/2204 0300 FG
BECMG 2204/2206 24006MPS
PROB40
TEMPO 2209/2218 -TSRA BKN020CB`
expected := &Forecast{
Identifier: "UUEE",
PublishTime: time.Date(2023, time.September, 21, 19, 58, 0, 0, time.UTC),
Valid: ValidPair{
From: time.Date(2023, time.September, 21, 21, 0, 0, 0, time.UTC),
To: time.Date(2023, time.September, 22, 21, 0, 0, 0, time.UTC),
Duration: time.Duration(86400000000000),
},
Visibility: Visibility{
Value: 9999,
Unit: units.Meters,
},
Wind: Wind{
Direction: Direction{
Variable: true,
},
Speed: 1,
Unit: units.MetersPerSecond,
},
SkyCondition: []SkyCondition{
{
Type: Scattered,
Altitude: 3000,
},
},
Temperature: []Temperature{
{
Type: High,
Value: 20,
Time: time.Date(2023, time.September, 22, 12, 0, 0, 0, time.UTC),
},
{
Type: Low,
Value: 12,
Time: time.Date(2023, time.September, 22, 2, 0, 0, 0, time.UTC),
},
},
Changes: []*Change{
{
Type: Temporary,
Valid: ValidPair{
From: time.Date(2023, time.September, 21, 21, 0, 0, 0, time.UTC),
To: time.Date(2023, time.September, 22, 4, 0, 0, 0, time.UTC),
Duration: time.Duration(25200000000000),
},
SkyCondition: []SkyCondition{
{
Type: Broken,
Altitude: 400,
},
},
Probability: 40,
},
{
Type: Temporary,
Valid: ValidPair{
From: time.Date(2023, time.September, 21, 21, 0, 0, 0, time.UTC),
To: time.Date(2023, time.September, 22, 4, 0, 0, 0, time.UTC),
Duration: time.Duration(25200000000000),
},
Visibility: Visibility{
Value: 300,
Unit: units.Meters,
},
Weather: []Weather{
{
Obscuration: Fog,
},
},
},
{
Type: Becoming,
Valid: ValidPair{
From: time.Date(2023, time.September, 22, 4, 0, 0, 0, time.UTC),
To: time.Date(2023, time.September, 22, 6, 0, 0, 0, time.UTC),
Duration: time.Duration(7200000000000),
},
Wind: Wind{
Direction: Direction{
Value: 240,
},
Speed: 6,
Unit: units.MetersPerSecond,
},
Probability: 40,
},
{
Type: Temporary,
Valid: ValidPair{
From: time.Date(2023, time.September, 22, 9, 0, 0, 0, time.UTC),
To: time.Date(2023, time.September, 22, 18, 0, 0, 0, time.UTC),
Duration: time.Duration(32400000000000),
},
SkyCondition: []SkyCondition{
{
Type: Broken,
Altitude: 2000,
CloudType: CumuloNimbus,
},
},
Weather: []Weather{
{
Modifier: Light,
Descriptor: Thunderstorm,
Precipitation: Rain,
},
},
},
},
}
fc, err := Parse(strings.NewReader(data))
if err != nil {
t.Fatalf("Error during parsing: %s", err)
}
if !reflect.DeepEqual(fc, expected) {
t.Errorf("Output does not match expected")
}
}
func TestEGLL(t *testing.T) {
const data = `TAF EGLL 211658Z 2118/2224 22008KT 9999 FEW040
BECMG 2201/2204 BKN007
PROB30
TEMPO 2202/2206 8000 BKN004
BECMG 2207/2210 SCT025`
expected := &Forecast{
Identifier: "EGLL",
PublishTime: time.Date(2023, time.September, 21, 16, 58, 0, 0, time.UTC),
Valid: ValidPair{
From: time.Date(2023, time.September, 21, 18, 0, 0, 0, time.UTC),
To: time.Date(2023, time.September, 23, 0, 0, 0, 0, time.UTC),
Duration: time.Duration(108000000000000),
},
Visibility: Visibility{
Value: 9999,
Unit: units.Meters,
},
Wind: Wind{
Direction: Direction{
Value: 220,
},
Speed: 8,
Unit: units.Knots,
},
SkyCondition: []SkyCondition{
{
Type: Few,
Altitude: 4000,
},
},
Changes: []*Change{
{
Type: Becoming,
Valid: ValidPair{
From: time.Date(2023, time.September, 22, 1, 0, 0, 0, time.UTC),
To: time.Date(2023, time.September, 22, 4, 0, 0, 0, time.UTC),
Duration: time.Duration(10800000000000),
},
SkyCondition: []SkyCondition{
{
Type: Broken,
Altitude: 700,
},
},
Probability: 30,
},
{
Type: Temporary,
Valid: ValidPair{
From: time.Date(2023, time.September, 22, 2, 0, 0, 0, time.UTC),
To: time.Date(2023, time.September, 22, 6, 0, 0, 0, time.UTC),
Duration: time.Duration(14400000000000),
},
Visibility: Visibility{
Value: 8000,
Unit: units.Meters,
},
SkyCondition: []SkyCondition{
{
Type: Broken,
Altitude: 400,
},
},
},
{
Type: Becoming,
Valid: ValidPair{
From: time.Date(2023, time.September, 22, 7, 0, 0, 0, time.UTC),
To: time.Date(2023, time.September, 22, 10, 0, 0, 0, time.UTC),
Duration: time.Duration(10800000000000),
},
SkyCondition: []SkyCondition{
{
Type: Scattered,
Altitude: 2500,
},
},
},
},
}
fc, err := Parse(strings.NewReader(data))
if err != nil {
t.Fatalf("Error during parsing: %s", err)
}
if !reflect.DeepEqual(fc, expected) {
t.Errorf("Output does not match expected")
}
}

58
time.go Normal file
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package taf
import (
"strings"
"time"
"go.elara.ws/taf/internal/parser"
)
const (
TimeFormat = "021504"
ValidFormat = "0215"
)
func parseTime(s string) (time.Time, error) {
t, err := time.Parse(TimeFormat, s)
if err != nil {
return time.Time{}, err
}
now := time.Now().UTC()
return t.AddDate(now.Year(), int(now.Month()), 0), nil
}
func parseValid(v *parser.ValidPair) (ValidPair, error) {
start, err := parseValidTime(v.Start)
if err != nil {
return ValidPair{}, err
}
end, err := parseValidTime(v.End)
if err != nil {
return ValidPair{}, err
}
return ValidPair{
From: start,
To: end,
Duration: end.Sub(start),
}, nil
}
func parseValidTime(s string) (time.Time, error) {
addDays := 0
// Go doesn't know what to do with hour 24,
// so we set it to 00 the next day
if strings.HasSuffix(s, "24") {
s = s[:2] + "00"
addDays = 1
}
t, err := time.Parse(ValidFormat, s)
if err != nil {
return time.Time{}, err
}
now := time.Now().UTC()
return t.AddDate(now.Year(), int(now.Month()), addDays), nil
}

188
types.go Normal file
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package taf
import (
"time"
"go.elara.ws/taf/units"
)
const None = ""
type Forecast struct {
Identifier string `json:"identifier,omitempty"`
PublishTime time.Time `json:"publish_time,omitempty"`
Valid ValidPair `json:"valid,omitempty"`
Visibility Visibility `json:"visibility,omitempty"`
Wind Wind `json:"wind,omitempty"`
SkyCondition []SkyCondition `json:"sky_condition,omitempty"`
Temperature []Temperature `json:"temperature,omitempty"`
Weather []Weather `json:"weather,omitempty"`
Probabilities []*Probability `json:"probabilities,omitempty"`
Changes []*Change `json:"changes,omitempty"`
Flags []Flag `json:"flags,omitempty"`
}
type Change struct {
Type ChangeType `json:"type,omitempty"`
Valid ValidPair `json:"valid,omitempty"`
Visibility Visibility `json:"visibility,omitempty"`
Wind Wind `json:"wind,omitempty"`
SkyCondition []SkyCondition `json:"sky_condition,omitempty"`
Temperature []Temperature `json:"temperature,omitempty"`
Weather []Weather `json:"weather,omitempty"`
Flags []Flag `json:"flags,omitempty"`
Probability int `json:"probability,omitempty"`
}
type Probability struct {
Valid ValidPair `json:"valid,omitempty"`
Value int `json:"value,omitempty"`
Visibility Visibility `json:"visibility,omitempty"`
Wind Wind `json:"wind,omitempty"`
SkyCondition []SkyCondition `json:"sky_condition,omitempty"`
Temperature []Temperature `json:"temperature,omitempty"`
Weather []Weather `json:"weather,omitempty"`
Flags []Flag `json:"flags,omitempty"`
}
type ValidPair struct {
From time.Time `json:"from,omitempty"`
To time.Time `json:"to,omitempty"`
Duration time.Duration `json:"duration,omitempty"`
}
type Visibility struct {
Plus bool `json:"plus,omitempty"`
Value float64 `json:"value,omitempty"`
Unit units.Distance `json:"unit,omitempty"`
}
type SkyConditionType string
const (
Few SkyConditionType = "FEW"
Scattered SkyConditionType = "SCT"
Broken SkyConditionType = "BKN"
Overcast SkyConditionType = "OVC"
VerticalVisibility SkyConditionType = "VV"
SkyClear SkyConditionType = "SKC"
)
type CloudType string
const (
CumuloNimbus CloudType = "CB"
ToweringCumulus CloudType = "TCU"
)
type SkyCondition struct {
Type SkyConditionType `json:"type,omitempty"`
Altitude int `json:"altitude,omitempty"`
CloudType CloudType `json:"cloud_type,omitempty"`
}
type Wind struct {
Direction Direction `json:"direction,omitempty"`
WindShear int `json:"wind_shear,omitempty"`
Speed int `json:"speed,omitempty"`
Gusts int `json:"gusts,omitempty"`
Unit units.Speed `json:"unit,omitempty"`
}
type Direction struct {
Variable bool `json:"variable,omitempty"`
Value int `json:"value,omitempty"`
}
type Modifier string
const (
Heavy Modifier = "+"
Light Modifier = "-"
)
type Descriptor string
const (
Shallow Descriptor = "MI"
Patches Descriptor = "BC"
LowDrifting Descriptor = "DC"
Blowing Descriptor = "BL"
Showers Descriptor = "SH"
Thunderstorm Descriptor = "TS"
Freezing Descriptor = "FZ"
Partial Descriptor = "PR"
)
type Precipitation string
const (
Drizzle Precipitation = "DZ"
Rain Precipitation = "RA"
Snow Precipitation = "SN"
SnowGrains Precipitation = "SG"
IceCrystals Precipitation = "IC"
IcePellets Precipitation = "PL"
Hail Precipitation = "GR"
SmallHail Precipitation = "GS"
Unknown Precipitation = "UP"
)
type Obscuration string
const (
Mist Obscuration = "BR"
Fog Obscuration = "FG"
Smoke Obscuration = "FU"
Dust Obscuration = "DU"
Sand Obscuration = "SA"
Haze Obscuration = "HZ"
Spray Obscuration = "PY"
VolcanicAsh Obscuration = "VA"
)
type Phenomenon string
const (
Whirls Phenomenon = "PO"
Squalls Phenomenon = "SQ"
FunnelCloud Phenomenon = "FC"
SandStorm Phenomenon = "SS"
DustStorm Phenomenon = "DS"
)
type Weather struct {
Vicinity bool `json:"vicinity,omitempty"`
Modifier Modifier `json:"modifier,omitempty"`
Descriptor Descriptor `json:"descriptor,omitempty"`
Precipitation Precipitation `json:"precipitation,omitempty"`
Obscuration Obscuration `json:"obscuration,omitempty"`
Phenomenon Phenomenon `json:"phenomenon,omitempty"`
}
type TemperatureType string
const (
High TemperatureType = "TX"
Low TemperatureType = "TN"
)
type Temperature struct {
Type TemperatureType `json:"type,omitempty"`
Value int `json:"value,omitempty"`
Time time.Time `json:"time,omitempty"`
}
type ChangeType string
const (
From ChangeType = "FM"
Becoming ChangeType = "BECMG"
Temporary ChangeType = "TEMPO"
)
type Flag string
const (
CeilingAndVisibilityOK Flag = "CAVOK"
)

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units/units.go Normal file
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package units
import (
"strings"
)
// Speed represents a unit of speed
type Speed string
// Speed units
const (
MetersPerSecond Speed = "MPS"
KilometersPerHour Speed = "KMH"
Knots Speed = "KT"
)
var speedNames = map[Speed]string{
MetersPerSecond: "m/s",
KilometersPerHour: "kph",
Knots: "kts",
}
func (su Speed) String() string {
name, ok := speedNames[su]
if !ok {
return "<unknown>"
}
return name
}
// Convert converts a value from one unit to another
func (sf Speed) Convert(st Speed, val int) int {
switch {
case sf == MetersPerSecond && st == KilometersPerHour:
return int(float64(val) * 3.6)
case sf == KilometersPerHour && st == MetersPerSecond:
return int(float64(val) / 3.6)
case sf == Knots && st == KilometersPerHour:
return int(float64(val) * 1.852)
case sf == KilometersPerHour && st == Knots:
return int(float64(val) / 1.852)
case sf == MetersPerSecond && st == Knots:
return int(float64(val) * 1.94384)
case sf == Knots && st == MetersPerSecond:
return int(float64(val) / 1.94384)
default:
return val
}
}
// ParseSpeed parses a speed value. Valid inputs include:
// mps, m/s, kmh, kph, kt, and kts.
// This function is case-insensitive.
func ParseSpeed(s string) (Speed, bool) {
if _, ok := speedNames[Speed(s)]; ok {
return Speed(s), true
}
for su, name := range speedNames {
if strings.EqualFold(s, name) ||
strings.EqualFold(s, string(su)) {
return su, true
}
}
return "", false
}
// Distance represents a unit of distance
type Distance string
// Distance units
const (
StatuteMiles Distance = "SM"
Meters Distance = "M"
)
var distanceNames = map[Distance]string{
StatuteMiles: "mi",
Meters: "m",
}
func (du Distance) String() string {
name, ok := distanceNames[du]
if !ok {
return "<unknown>"
}
return name
}
// Convert converts a value from one unit to another
func (df Distance) Convert(dt Distance, val float64) float64 {
switch {
case df == StatuteMiles && dt == Meters:
return val * 1609
case df == Meters && dt == StatuteMiles:
return val / 1609
default:
return val
}
}
// ParseDistance parses a speed value. Valid inputs include:
// sm, mi, and m. This function is case-insensitive.
func ParseDistance(s string) (Distance, bool) {
if _, ok := distanceNames[Distance(s)]; ok {
return Distance(s), true
}
for d, name := range distanceNames {
if strings.EqualFold(s, name) ||
strings.EqualFold(s, string(d)) {
return d, true
}
}
return "", false
}