Fix scanner for Windows line endings and add tests

hcl/scanner/scanner.go

@@ -399,6 +399,13 @@ func (s *Scanner) scanHeredoc() {
 		return
 	}
 
+	// Ignore the '\r' in Windows line endings
+	if ch == '\r' {
+		if s.peek() == '\n' {
+			ch = s.next()
+		}
+	}
+
 	// If we didn't reach a newline then that is also not good
 	if ch != '\n' {
 		s.err("invalid characters in heredoc anchor")

hcl/scanner/scanner_test.go

@@ -6,6 +6,7 @@ import (
 	"testing"
 
 	"github.com/hashicorp/hcl/hcl/token"
+	"strings"
 )
 
 var f100 = "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
@@ -308,6 +309,44 @@ func TestFloat(t *testing.T) {
 	testTokenList(t, tokenLists["float"])
 }
 
+func TestWindowsLineEndings(t *testing.T) {
+	hcl := `// This should have Windows line endings
+resource "aws_instance" "foo" {
+    user_data=<<HEREDOC
+    test script
+HEREDOC
+}`
+	hclWindowsEndings := strings.Replace(hcl, "\n", "\r\n", -1)
+
+	literals := []struct {
+		tokenType token.Type
+		literal   string
+	}{
+		{token.COMMENT, "// This should have Windows line endings\r"},
+		{token.IDENT, `resource`},
+		{token.STRING, `"aws_instance"`},
+		{token.STRING, `"foo"`},
+		{token.LBRACE, `{`},
+		{token.IDENT, `user_data`},
+		{token.ASSIGN, `=`},
+		{token.HEREDOC, "<<HEREDOC\r\n    test script\r\nHEREDOC\r\n"},
+		{token.RBRACE, `}`},
+	}
+
+	s := New([]byte(hclWindowsEndings))
+	for _, l := range literals {
+		tok := s.Scan()
+
+		if l.tokenType != tok.Type {
+			t.Errorf("got: %s want %s for %s\n", tok, l.tokenType, tok.String())
+		}
+
+		if l.literal != tok.Text {
+			t.Errorf("got:\n%v\nwant:\n%v\n", []byte(tok.Text), []byte(l.literal))
+		}
+	}
+}
+
 func TestRealExample(t *testing.T) {
 	complexHCL := `// This comes from Terraform, as a test
 	variable "foo" {