WIP

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

parser/text_quoted.go

@@ -0,0 +1,112 @@
+package parser
+
+import (
+	"asciigoat.org/core/lexer"
+)
+
+// AcceptQuotedString consumes a quoted string from the source
+// and returns it unquoted.
+func (p *TextParser) AcceptQuotedString() (string, bool, error) {
+	r, _, err := p.ReadRune()
+	switch {
+	case err != nil:
+		// nothing here
+		return "", false, err
+	case r != RuneQuotes:
+		// not for us
+		p.UnreadRune()
+		return "", false, nil
+	default:
+		// let's roll
+		s, err := lexQuotedString(p)
+		switch {
+		case err != nil:
+			// bad quoted string
+			return "", false, err
+		default:
+			// success
+			return s, true, nil
+		}
+	}
+}
+
+func lexQuotedString(p *TextParser) (string, *lexer.Error) {
+	s, ok, err := lexQuotedStringNoEscape(p)
+	switch {
+	case err != nil:
+		return "", err
+	case ok:
+		return s, nil
+	default:
+		// escape character detected
+		return lexQuotedStringEscaped(p)
+	}
+}
+
+func lexQuotedStringNoEscape(p *TextParser) (string, bool, *lexer.Error) {
+	for {
+		r, _, err := p.ReadRune()
+		switch {
+		case err != nil:
+			// incomplete
+			return "", false, NewErrIncompleteQuotedString(p)
+		case r == RuneQuotes:
+			// end, just remove the quotes
+			s := p.String()
+			l := len(s)
+			return s[1 : l-2], true, nil
+		case r == RuneEscape:
+			// things just got complicated...
+			return "", false, nil
+		case IsNewLine(r):
+			// new lines within quoted values are acceptable
+			p.UnreadRune()
+			p.AcceptNewLine()
+		default:
+			// continue
+		}
+	}
+}
+
+func lexQuotedStringEscaped(*TextParser) (string, *lexer.Error) {
+	return "", nil
+}
+
+//	// escaped. append partial
+//	mark = lexQuotedAppendPartial(p, &buf, mark)
+//
+//	r2, _, err := p.ReadRune()
+//	switch {
+//	case err != nil:
+//		// incomplete
+//		return "", NewErrIncompleteQuotedString(p)
+//	case IsNewLine(r2):
+//		// escaped new line
+//		p.UnreadRune()
+//		p.AcceptNewLine()
+//		mark = lexQuotedAppendNewLine(p, &buf, mark)
+//	default:
+//		// bad escaped
+//	}
+
+// Unquoted removes quotes and unescapes the content
+func Unquoted(s string) (string, error) {
+	var p TextParser
+	if s == "" {
+		return "", nil
+	}
+
+	p.InitString(s)
+	unquoted, ok, err := p.AcceptQuotedString()
+	switch {
+	case err != nil:
+		// bad string
+		return "", err
+	case ok:
+		// success
+		return unquoted, nil
+	default:
+		// not quoted
+		return s, nil
+	}
+}