Scan a '$' inside interpolations (#146)

Author: FollowTheProcess

internal/syntax/scanner/scanner.go

@@ -479,6 +479,10 @@ func scanOpenInterp(s *Scanner) stateFn {
 func scanInsideInterp(s *Scanner) stateFn {
 	s.skip(isLineSpace)
 
+	if s.take("$") {
+		s.emit(token.Dollar)
+	}
+
 	// TODO(@FollowTheProcess): Handle more than just idents
 	//
 	// That's the whole reason I'm rewriting the scanner, to make this easier

internal/syntax/scanner/testdata/valid/interpolation-builtin.txtar

@@ -0,0 +1,21 @@
+-- src.http --
+@id = {{ $guid }}
+
+### Test
+GET https://example.com/{{ id }}
+-- tokens.txt --
+<Token::At start=0, end=1>
+<Token::Ident start=1, end=3>
+<Token::Eq start=4, end=5>
+<Token::OpenInterp start=6, end=8>
+<Token::Dollar start=9, end=10>
+<Token::Ident start=10, end=14>
+<Token::CloseInterp start=15, end=17>
+<Token::Separator start=19, end=22>
+<Token::Comment start=23, end=27>
+<Token::MethodGet start=28, end=31>
+<Token::Text start=32, end=52>
+<Token::OpenInterp start=52, end=54>
+<Token::Ident start=55, end=57>
+<Token::CloseInterp start=58, end=60>
+<Token::EOF start=61, end=61>

internal/syntax/token/kind.go

@@ -14,6 +14,7 @@ const (
 	At                            // At
 	Ident                         // Ident
 	Eq                            // Eq
+	Dollar                        // Dollar
 	Colon                         // Colon
 	LeftAngle                     // LeftAngle
 	RightAngle                    // RightAngle