Version 11 released. Read https://github.com/kataras/iris/blob/master/HISTORY.md#su-21-october-2018--v1100

Former-commit-id: fe6305deed00e170bf4d39a12c0644fe686e0a24

macro/interpreter/token/token.go

@@ -0,0 +1,53 @@
+package token
+
+// Type is a specific type of int which describes the symbols.
+type Type int
+
+// Token describes the letter(s) or symbol, is a result of the lexer.
+type Token struct {
+	Type    Type
+	Literal string
+	Start   int // including the first char
+	End     int // including the last char
+}
+
+// /about/{fullname:alphabetical}
+// /profile/{anySpecialName:string}
+// {id:uint64 range(1,5) else 404}
+// /admin/{id:int eq(1) else 402}
+// /file/{filepath:file else 405}
+const (
+	EOF = iota // 0
+	ILLEGAL
+
+	// Identifiers + literals
+	LBRACE // {
+	RBRACE // }
+	//	PARAM_IDENTIFIER // id
+	COLON  // :
+	LPAREN // (
+	RPAREN // )
+	//	PARAM_FUNC_ARG   // 1
+	COMMA
+	IDENT // string or keyword
+	// Keywords
+	// keywords_start
+	ELSE // else
+	// keywords_end
+	INT // 42
+)
+
+const eof rune = 0
+
+var keywords = map[string]Type{
+	"else": ELSE,
+}
+
+// LookupIdent receives a series of chars
+// and tries to resolves the token type.
+func LookupIdent(ident string) Type {
+	if tok, ok := keywords[ident]; ok {
+		return tok
+	}
+	return IDENT
+}