Unmarshal: WIP

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

go.mod

@@ -5,7 +5,7 @@ go 1.19
 replace asciigoat.org/core => ../core
 
 require (
-	asciigoat.org/core v0.3.4
+	asciigoat.org/core v0.3.6
 	github.com/mgechev/revive v1.3.3
 )
 

parser/parser.go

@@ -13,10 +13,24 @@ type Parser struct {
 
 	pos lexer.Position
 
+	// OnSection is called after a [section] is parsed.
+	// Returning an error will abort the process.
 	OnSection func(pos lexer.Position, name, subname string, hasSubname bool) error
-	OnField   func(pos lexer.Position, key, value string) error
+
+	// OnField is called after a `key = value` entry is parsed
+	// Returning an error will abort the process.
+	OnField func(pos lexer.Position, key, value string) error
+
+	// OnComment is called after a comment is parsed
+	// Returning an error will abort the process.
 	OnComment func(pos lexer.Position, comment string) error
-	OnError   func(pos lexer.Position, content string, err error) error
+
+	// OnError is called after each parsing error, which you are allowed to
+	// override.
+	// OnError is called for EOF as well, but this error isn't returned as such by
+	// Parser.Run(). The caller will receive (nil, nil) instead indicating the
+	// processes terminated correctly.
+	OnError func(pos lexer.Position, content string, err error) error
 }
 
 func defaultOnSection(_ lexer.Position, _, _ string, _ bool) error { return nil }