initial commits

token/bytes.go

@@ -0,0 +1,76 @@
+package token
+
+import (
+	"sourcecode.social/reiver/go-rfc2616/char"
+	"sourcecode.social/reiver/go-rfc2616/ctl"
+	"sourcecode.social/reiver/go-rfc2616/separator"
+)
+
+// Bytes returns the 'Method', as defiend by IETF RFC-2616.
+//
+//	 Method          = "OPTIONS"
+//	                 | "GET"
+//	                 | "HEAD"
+//	                 | "POST"
+//	                 | "PUT"
+//	                 | "DELETE"
+//	                 | "TRACE"
+//	                 | "CONNECT"
+//	                 | extension-method
+//
+//	extension-method = token
+//
+// Which, in practice, can be simplified to:
+//
+//	 Method          = token
+//
+// And 'token' is defined as:
+//
+//	token            = 1*<any CHAR except CTLs or separators>
+//
+//	CHAR           = <any US-ASCII character (octets 0 - 127)>
+//
+//	CTL            = <any US-ASCII control character (octets 0 - 31) and DEL (127)>
+//
+//	separators     = "(" | ")" | "<" | ">" | "@"
+//	               | "," | ";" | ":" | "\" | <">
+//	               | "/" | "[" | "]" | "?" | "="
+//	               | "{" | "}" | SP | HT
+//
+//	SP             = <US-ASCII SP, space (32)>
+//
+//	HT	       = <US-ASCII HT, horizontal-tab (9)>
+func Bytes(p []byte) (method []byte, rest []byte, ok bool) {
+	if 0 == len(p) {
+		return nil, nil, false
+	}
+
+	{
+		p0 := p[0]
+
+		if !char.ByteIsChar(p0) {
+			return nil, p, false
+		}
+
+		if separator.ByteIsSeparator(p0) {
+			return nil, p, false
+		}
+
+		if ctl.ByteIsControlCharacter(p0) {
+			return nil, p, false
+		}
+	}
+
+	{
+		var i int
+		var b byte
+
+		for  i,b = range p {
+			if !char.ByteIsChar(b) || separator.ByteIsSeparator(b) || ctl.ByteIsControlCharacter(b) {
+				return p[:i], p[i:], true
+			}
+		}
+
+		return p, nil, true
+	}
+}