decoder [WIP]

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

basic/write.go

@@ -45,6 +45,14 @@ func writeFieldsTo(w io.Writer, fields []Field, nl string) (int64, error) {
 	return int64(written), nil
 }
 
+// String generates a string output for "%s"
+func (field Field) String() string {
+	var buf bytes.Buffer
+
+	_, _ = writeFieldsTo(&buf, []Field{field}, WriteNewLine)
+	return buf.String()
+}
+
 func writeSectionToBuffer(w *bytes.Buffer, sec *Section, nl string) int {
 	var written, n int
 
@@ -74,6 +82,14 @@ func writeSectionToBuffer(w *bytes.Buffer, sec *Section, nl string) int {
 	return written + int(n64)
 }
 
+// String generates a string output for "%s"
+func (sec *Section) String() string {
+	var buf bytes.Buffer
+
+	_ = writeSectionToBuffer(&buf, sec, WriteNewLine)
+	return buf.String()
+}
+
 // WriteTo writes a INI representation of the document
 // onto the provided writer.
 func (doc *Document) WriteTo(w io.Writer) (int64, error) {
@@ -81,7 +97,7 @@ func (doc *Document) WriteTo(w io.Writer) (int64, error) {
 	return buf.WriteTo(w)
 }
 
-// GoString generates a string output for "%s"
+// String generates a string output for "%s"
 func (doc *Document) String() string {
 	buf := doc.AsBuffer(WriteNewLine)
 	return buf.String()

decoder.go

@@ -0,0 +1,74 @@
+package ini
+
+import (
+	"bytes"
+	"io"
+	"strings"
+
+	"asciigoat.org/core"
+	"asciigoat.org/core/reflection"
+	"asciigoat.org/ini/parser"
+)
+
+// Decoder ...
+type Decoder[T any] struct {
+	io.Closer
+
+	out *reflection.Reflection[T]
+	p   *parser.Parser
+}
+
+// Decode ...
+func (dec *Decoder[T]) Decode(v *T) error {
+	defer dec.Close()
+
+	r, err := reflection.New(v)
+	switch e := err.(type) {
+	case *reflection.InvalidUnmarshalError:
+		// customize error
+		e.Prefix = "ini"
+		e.Method = "Decode"
+		return e
+	case nil:
+		// good reflection. Go!
+		dec.out = r
+		return dec.p.Run()
+	default:
+		// other errors
+		panic("unreachable")
+	}
+
+}
+
+// NewDecoder creates a Decoder using the provided [io.Reader]
+// as source
+func NewDecoder[T any](r io.Reader) *Decoder[T] {
+	rc := core.NewReadCloser(r)
+	switch {
+	case rc == nil:
+		return nil
+	default:
+		dec := &Decoder[T]{
+			p:      parser.NewParser(rc),
+			Closer: rc,
+		}
+		dec.init()
+		return dec
+	}
+}
+
+func (dec *Decoder[T]) init() {
+	dec.p.OnToken = dec.parserOnToken
+	dec.p.OnError = dec.parserOnError
+}
+
+// NewDecoderBytes creates a Decoder using the provided bytes array
+// as source
+func NewDecoderBytes[T any](b []byte) *Decoder[T] {
+	return NewDecoder[T](bytes.NewReader(b))
+}
+
+// NewDecoderString creates a Decoder over a provided string of data
+func NewDecoderString[T any](s string) *Decoder[T] {
+	return NewDecoder[T](strings.NewReader(s))
+}

decoder_error.go

@@ -0,0 +1,18 @@
+package ini
+
+import (
+	"log"
+
+	"asciigoat.org/core/lexer"
+)
+
+func (*Decoder[T]) parserOnError(pos lexer.Position, content string, err error) error {
+	log.Printf("%s: %s %s: %q: %v", "ini", pos, "error:", content, err)
+
+	return &lexer.Error{
+		Line:    pos.Line,
+		Column:  pos.Column,
+		Content: content,
+		Err:     err,
+	}
+}

decoder_token.go

@@ -0,0 +1,14 @@
+package ini
+
+import (
+	"log"
+
+	"asciigoat.org/core/lexer"
+	"asciigoat.org/ini/parser"
+)
+
+func (*Decoder[T]) parserOnToken(pos lexer.Position, typ parser.TokenType, value string) error {
+	log.Printf("%s: %s %s %q", "ini", pos, typ, value)
+
+	return nil
+}

go.mod

@@ -2,6 +2,8 @@ module asciigoat.org/ini
 
 go 1.19
 
+replace asciigoat.org/core => ../core
+
 require (
 	asciigoat.org/core v0.3.7
 	github.com/mgechev/revive v1.3.3

go.sum

@@ -1,5 +1,3 @@
-asciigoat.org/core v0.3.7 h1:tMasdvZgsMJJMVsZVfXXB5lqq82pFiCsyEmOEmcmAfI=
-asciigoat.org/core v0.3.7/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=