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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
If you develop a new program, and you want it to be of the greatest
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Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
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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
<http://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
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may consider it more useful to permit linking proprietary applications with
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.

72
cmd/tafparser/main.go Normal file
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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"
)

118
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
}