Unmarshal: WIP

Signed-off-by: Alejandro Mery <amery@jpi.io>

README.md

@@ -0,0 +1,48 @@
+# asciigoat's INI parser
+
+[![Go Reference][godoc-badge]][godoc]
+[![Go Report Card][goreport-badge]][goreport]
+
+`asciigoat.org/ini` is a simple Go library that very loosly parses
+[`INI`-style][wikipedia-dosini] documents allowing the implementation
+of stricter parsers of similar form.
+
+**asciigoat** is [MIT](https://opensource.org/license/mit/) licensed.
+
+[godoc]: https://pkg.go.dev/asciigoat.org/ini
+[godoc-badge]: https://pkg.go.dev/badge/asciigoat.org/ini.svg
+[goreport]: https://goreportcard.com/report/asciigoat.org/ini
+[goreport-badge]: https://goreportcard.com/badge/asciigoat.org/ini
+
+[godoc-lexer]: https://pkg.go.dev/asciigoat.org/core/lexer
+[godoc-parser-parser]: https://pkg.go.dev/asciigoat.org/ini/parser#Parser
+[godoc-basic-parser]: https://pkg.go.dev/asciigoat.org/ini/basic#Decode
+
+[wikipedia-dosini]: https://en.wikipedia.org/wiki/INI_file
+
+## Parser
+
+[`parser.Parser`][godoc-parser-parser] uses
+[`asciigoat`'s lexer][godoc-lexer] to process an `INI`-style document
+emiting tokens and errors via callbacks.
+
+## Basic Parser
+
+[`basic.Decode()`][godoc-basic-parser] provies a one-shot decoder
+that returns a structured document for you to post-process.
+
+To allow for correct handling of repetition of section and field names downstream, it uses arrays instead of maps, and makes almost no judgment
+about what section or field names are acceptable.
+
+## Other Implementations
+
+* [gcfg](https://pkg.go.dev/gopkg.in/gcfg.v1)
+* [unknwon's go-ini](https://github.com/go-ini/ini)
+* [wlevene's GoINI](https://github.com/wlevene/ini)
+
+## See also
+
+* [asciigoat.org/core](https://asciigoat.org/core)
+* [oss.jpi.io](https://oss.jpi.io)
+* [INI file][wikipedia-dosini] (_wikipedia_)
+* [TOML](https://www.kelche.co/blog/go/toml/)

basic/basic.go

@@ -0,0 +1,2 @@
+// Package basic provides a basic representation of dosini-style documents
+package basic

basic/decoder.go

@@ -0,0 +1,73 @@
+package basic
+
+import (
+	"bytes"
+	"io"
+	"io/fs"
+	"log"
+	"strings"
+
+	"asciigoat.org/core/lexer"
+	"asciigoat.org/ini/parser"
+)
+
+type token struct {
+	pos   lexer.Position
+	typ   parser.TokenType
+	value string
+}
+
+type decoder struct {
+	p   *parser.Parser
+	out *Document
+
+	queue      []token
+	curSection *Section
+	curField   *Field
+}
+
+func (dec *decoder) OnToken(pos lexer.Position, typ parser.TokenType, value string) error {
+	tok := token{pos, typ, value}
+
+	log.Printf("%s[%v]: %s %s: %q", "decoder", len(dec.queue), pos, typ, value)
+
+	dec.queue = append(dec.queue, tok)
+
+	return nil
+}
+
+func (*decoder) OnError(pos lexer.Position, hint string, err error) error {
+	log.Printf("%s: %s %s: %s: %v", "decoder", pos, "error", hint, err)
+	return err
+}
+
+// Decode ...
+func Decode(r io.Reader) (*Document, error) {
+	var out Document
+
+	if r == nil {
+		return nil, fs.ErrNotExist
+	}
+
+	// parser
+	p := parser.NewParser(r)
+	// decoder
+	dec := decoder{p: p, out: &out}
+	// glue
+	p.OnToken = dec.OnToken
+	p.OnError = dec.OnError
+
+	// Go!
+	err := p.Run()
+	return &out, err
+}
+
+// DecodeBytes ...
+func DecodeBytes(b []byte) (*Document, error) {
+	return Decode(bytes.NewReader(b))
+}
+
+// DecodeString ...
+func DecodeString(s string) (*Document, error) {
+	return Decode(strings.NewReader(s))
+}

basic/types.go

@@ -0,0 +1,23 @@
+package basic
+
+// Document ...
+type Document struct {
+	Global []Field
+
+	Sections []Section
+}
+
+// Section ...
+type Section struct {
+	Name   string
+	Key    string
+	HadKey bool
+
+	Fields []Field
+}
+
+// Field ...
+type Field struct {
+	Key   string
+	Value string
+}

decoder.go

@@ -0,0 +1,49 @@
+package ini
+
+import (
+	"bytes"
+	"io"
+	"strings"
+
+	"asciigoat.org/core"
+	"asciigoat.org/ini/parser"
+)
+
+// Decoder ...
+type Decoder struct {
+	io.Closer
+
+	p *parser.Parser
+}
+
+// Decode ...
+func (dec *Decoder) Decode() error {
+	defer dec.Close()
+
+	return dec.p.Run()
+}
+
+// NewDecoder creates a Decoder over the provided [io.Reader]
+func NewDecoder(r io.Reader) *Decoder {
+	rc := core.NewReadCloser(r)
+	switch {
+	case rc == nil:
+		return nil
+	default:
+		dec := &Decoder{
+			p:      parser.NewParser(rc),
+			Closer: rc,
+		}
+		return dec
+	}
+}
+
+// NewDecoderBytes creates a Decoder over a provided bytes array
+func NewDecoderBytes(b []byte) *Decoder {
+	return NewDecoder(bytes.NewReader(b))
+}
+
+// NewDecoderString creates a Decoder over a provided string of data
+func NewDecoderString(s string) *Decoder {
+	return NewDecoder(strings.NewReader(s))
+}

go.mod

@@ -2,8 +2,10 @@ module asciigoat.org/ini
 
 go 1.19
 
+replace asciigoat.org/core => ../core
+
 require (
-	asciigoat.org/core v0.3.6
+	asciigoat.org/core v0.3.7
 	github.com/mgechev/revive v1.3.3
 	golang.org/x/tools v0.12.0
 )

go.sum

@@ -1,5 +1,3 @@
-asciigoat.org/core v0.3.6 h1:b1vL090OxylmSOwLQryjrmC8FhhCtktMyeJSy1e6LwI=
-asciigoat.org/core v0.3.6/go.mod h1:tXj+JUutxRbcO40ZQRuUVaZ4rnYz1kAZ0nblisV8u74=
 github.com/BurntSushi/toml v1.3.2 h1:o7IhLm0Msx3BaB+n3Ag7L8EVlByGnpq14C4YWiu/gL8=
 github.com/BurntSushi/toml v1.3.2/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=
 github.com/chavacava/garif v0.0.0-20230608123814-4bd63c2919ab h1:5JxePczlyGAtj6R1MUEFZ/UFud6FfsOejq7xLC2ZIb0=

unmarshal.go

@@ -0,0 +1,15 @@
+package ini
+
+import "io"
+
+// ReadInto ...
+func ReadInto(v any, r io.Reader) error {
+	dec := NewDecoder(r)
+
+	return dec.Unmarshal(v)
+}
+
+// Unmarshal ...
+func (dec *Decoder) Unmarshal(any) error {
+	return dec.p.Run()
+}