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package main
import (
"os"
"github.com/alecthomas/kong"
"github.com/alecthomas/repr"
"github.com/alecthomas/participle/v2"
"github.com/alecthomas/participle/v2/lexer"
)
type TOML struct {
Pos lexer.Position
Entries []*Entry `@@*`
}
type Entry struct {
Field *Field ` @@`
Section *Section `| @@`
}
type Field struct {
Key string `@Ident "="`
Value *Value `@@`
}
type Value struct {
String *string ` @String`
DateTime *string `| @DateTime`
Date *string `| @Date`
Time *string `| @Time`
Bool *bool `| (@"true" | "false")`
Number *float64 `| @Number`
List []*Value `| "[" ( @@ ( "," @@ )* )? "]"`
}
type Section struct {
Name string `"[" @(Ident ( "." Ident )*) "]"`
Fields []*Field `@@*`
}
var (
tomlLexer = lexer.MustSimple([]lexer.SimpleRule{
{"DateTime", `\d\d\d\d-\d\d-\d\dT\d\d:\d\d:\d\d(\.\d+)?(-\d\d:\d\d)?`},
{"Date", `\d\d\d\d-\d\d-\d\d`},
{"Time", `\d\d:\d\d:\d\d(\.\d+)?`},
{"Ident", `[a-zA-Z_][a-zA-Z_0-9]*`},
{"String", `"[^"]*"`},
{"Number", `[-+]?[.0-9]+\b`},
{"Punct", `\[|]|[-!()+/*=,]`},
{"comment", `#[^\n]+`},
{"whitespace", `\s+`},
})
tomlParser = participle.MustBuild[TOML](
participle.Lexer(tomlLexer),
participle.Unquote("String"),
)
cli struct {
File string `help:"TOML file to parse." arg:""`
}
)
func main() {
ctx := kong.Parse(&cli)
r, err := os.Open(cli.File)
ctx.FatalIfErrorf(err)
defer r.Close()
toml, err := tomlParser.Parse(cli.File, r)
ctx.FatalIfErrorf(err)
repr.Println(toml)
}
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