1 files changed, 276 insertions, 0 deletions
diff --git a/src/pkg/go/scanner/scanner_test.go b/src/pkg/go/scanner/scanner_test.go
new file mode 100644
index 000000000..0defece8b
--- /dev/null
+++ b/src/pkg/go/scanner/scanner_test.go
@@ -0,0 +1,276 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package scanner
+
+import (
+	"go/scanner";
+	"go/token";
+	"io";
+	"testing";
+)
+
+
+const /* class */ (
+	special = iota;
+	literal;
+	operator;
+	keyword;
+)
+
+
+func tokenclass(tok token.Token) int {
+	switch {
+	case tok.IsLiteral(): return literal;
+	case tok.IsOperator(): return operator;
+	case tok.IsKeyword(): return keyword;
+	}
+	return special;
+}
+
+
+type elt struct {
+	tok token.Token;
+	lit string;
+	class int;
+}
+
+
+var tokens = [...]elt{
+	// Special tokens
+	elt{ token.COMMENT, "/* a comment */", special },
+	elt{ token.COMMENT, "// a comment \n", special },
+
+	// Identifiers and basic type literals
+	elt{ token.IDENT, "foobar", literal },
+	elt{ token.IDENT, "a۰۱۸", literal },
+	elt{ token.IDENT, "foo६४", literal },
+	elt{ token.IDENT, "bar９８７６", literal },
+	elt{ token.INT, "0", literal },
+	elt{ token.INT, "01234567", literal },
+	elt{ token.INT, "0xcafebabe", literal },
+	elt{ token.FLOAT, "0.", literal },
+	elt{ token.FLOAT, ".0", literal },
+	elt{ token.FLOAT, "3.14159265", literal },
+	elt{ token.FLOAT, "1e0", literal },
+	elt{ token.FLOAT, "1e+100", literal },
+	elt{ token.FLOAT, "1e-100", literal },
+	elt{ token.FLOAT, "2.71828e-1000", literal },
+	elt{ token.CHAR, "'a'", literal },
+	elt{ token.CHAR, "'\\000'", literal },
+	elt{ token.CHAR, "'\\xFF'", literal },
+	elt{ token.CHAR, "'\\uff16'", literal },
+	elt{ token.CHAR, "'\\U0000ff16'", literal },
+	elt{ token.STRING, "`foobar`", literal },
+
+	// Operators and delimitors
+	elt{ token.ADD, "+", operator },
+	elt{ token.SUB, "-", operator },
+	elt{ token.MUL, "*", operator },
+	elt{ token.QUO, "/", operator },
+	elt{ token.REM, "%", operator },
+
+	elt{ token.AND, "&", operator },
+	elt{ token.OR, "|", operator },
+	elt{ token.XOR, "^", operator },
+	elt{ token.SHL, "<<", operator },
+	elt{ token.SHR, ">>", operator },
+	elt{ token.AND_NOT, "&^", operator },
+
+	elt{ token.ADD_ASSIGN, "+=", operator },
+	elt{ token.SUB_ASSIGN, "-=", operator },
+	elt{ token.MUL_ASSIGN, "*=", operator },
+	elt{ token.QUO_ASSIGN, "/=", operator },
+	elt{ token.REM_ASSIGN, "%=", operator },
+
+	elt{ token.AND_ASSIGN, "&=", operator },
+	elt{ token.OR_ASSIGN, "|=", operator },
+	elt{ token.XOR_ASSIGN, "^=", operator },
+	elt{ token.SHL_ASSIGN, "<<=", operator },
+	elt{ token.SHR_ASSIGN, ">>=", operator },
+	elt{ token.AND_NOT_ASSIGN, "&^=", operator },
+
+	elt{ token.LAND, "&&", operator },
+	elt{ token.LOR, "||", operator },
+	elt{ token.ARROW, "<-", operator },
+	elt{ token.INC, "++", operator },
+	elt{ token.DEC, "--", operator },
+
+	elt{ token.EQL, "==", operator },
+	elt{ token.LSS, "<", operator },
+	elt{ token.GTR, ">", operator },
+	elt{ token.ASSIGN, "=", operator },
+	elt{ token.NOT, "!", operator },
+
+	elt{ token.NEQ, "!=", operator },
+	elt{ token.LEQ, "<=", operator },
+	elt{ token.GEQ, ">=", operator },
+	elt{ token.DEFINE, ":=", operator },
+	elt{ token.ELLIPSIS, "...", operator },
+
+	elt{ token.LPAREN, "(", operator },
+	elt{ token.LBRACK, "[", operator },
+	elt{ token.LBRACE, "{", operator },
+	elt{ token.COMMA, ",", operator },
+	elt{ token.PERIOD, ".", operator },
+
+	elt{ token.RPAREN, ")", operator },
+	elt{ token.RBRACK, "]", operator },
+	elt{ token.RBRACE, "}", operator },
+	elt{ token.SEMICOLON, ";", operator },
+	elt{ token.COLON, ":", operator },
+
+	// Keywords
+	elt{ token.BREAK, "break", keyword },
+	elt{ token.CASE, "case", keyword },
+	elt{ token.CHAN, "chan", keyword },
+	elt{ token.CONST, "const", keyword },
+	elt{ token.CONTINUE, "continue", keyword },
+
+	elt{ token.DEFAULT, "default", keyword },
+	elt{ token.DEFER, "defer", keyword },
+	elt{ token.ELSE, "else", keyword },
+	elt{ token.FALLTHROUGH, "fallthrough", keyword },
+	elt{ token.FOR, "for", keyword },
+
+	elt{ token.FUNC, "func", keyword },
+	elt{ token.GO, "go", keyword },
+	elt{ token.GOTO, "goto", keyword },
+	elt{ token.IF, "if", keyword },
+	elt{ token.IMPORT, "import", keyword },
+
+	elt{ token.INTERFACE, "interface", keyword },
+	elt{ token.MAP, "map", keyword },
+	elt{ token.PACKAGE, "package", keyword },
+	elt{ token.RANGE, "range", keyword },
+	elt{ token.RETURN, "return", keyword },
+
+	elt{ token.SELECT, "select", keyword },
+	elt{ token.STRUCT, "struct", keyword },
+	elt{ token.SWITCH, "switch", keyword },
+	elt{ token.TYPE, "type", keyword },
+	elt{ token.VAR, "var", keyword },
+}
+
+
+const whitespace = "  \t  \n\n\n";  // to separate tokens
+
+type TestErrorHandler struct {
+	t *testing.T
+}
+
+func (h *TestErrorHandler) Error(pos token.Position, msg string) {
+	h.t.Errorf("Error() called (msg = %s)", msg);
+}
+
+
+func NewlineCount(s string) int {
+	n := 0;
+	for i := 0; i < len(s); i++ {
+		if s[i] == '\n' {
+			n++;
+		}
+	}
+	return n;
+}
+
+
+// Verify that calling Scan() provides the correct results.
+func TestScan(t *testing.T) {
+	// make source
+	var src string;
+	for i, e := range tokens {
+		src += e.lit + whitespace;
+	}
+	whitespace_linecount := NewlineCount(whitespace);
+
+	// verify scan
+	index := 0;
+	eloc := token.Position{0, 1, 1};
+	nerrors := scanner.Tokenize(io.StringBytes(src), &TestErrorHandler{t}, scanner.ScanComments,
+		func (pos token.Position, tok token.Token, litb []byte) bool {
+			e := elt{token.EOF, "", special};
+			if index < len(tokens) {
+				e = tokens[index];
+			}
+			lit := string(litb);
+			if tok == token.EOF {
+				lit = "<EOF>";
+				eloc.Column = 0;
+			}
+			if pos.Offset != eloc.Offset {
+				t.Errorf("bad position for %s: got %d, expected %d", lit, pos.Offset, eloc.Offset);
+			}
+			if pos.Line != eloc.Line {
+				t.Errorf("bad line for %s: got %d, expected %d", lit, pos.Line, eloc.Line);
+			}
+			if pos.Column!= eloc.Column {
+				t.Errorf("bad column for %s: got %d, expected %d", lit, pos.Column, eloc.Column);
+			}
+			if tok != e.tok {
+				t.Errorf("bad token for %s: got %s, expected %s", lit, tok.String(), e.tok.String());
+			}
+			if e.tok.IsLiteral() && lit != e.lit {
+				t.Errorf("bad literal for %s: got %s, expected %s", lit, lit, e.lit);
+			}
+			if tokenclass(tok) != e.class {
+				t.Errorf("bad class for %s: got %d, expected %d", lit, tokenclass(tok), e.class);
+			}
+			eloc.Offset += len(lit) + len(whitespace);
+			eloc.Line += NewlineCount(lit) + whitespace_linecount;
+			index++;
+			return tok != token.EOF;
+		}
+	);
+	if nerrors != 0 {
+		t.Errorf("found %d errors", nerrors);
+	}
+}
+
+
+// Verify that initializing the same scanner more then once works correctly.
+func TestInit(t *testing.T) {
+	var s scanner.Scanner;
+
+	// 1st init
+	s.Init(io.StringBytes("if true { }"), nil, 0);
+	s.Scan();  // if
+	s.Scan();  // true
+	pos, tok, lit := s.Scan();  // {
+	if tok != token.LBRACE {
+		t.Errorf("bad token: got %s, expected %s", tok.String(), token.LBRACE);
+	}
+
+	// 2nd init
+	s.Init(io.StringBytes("go true { ]"), nil, 0);
+	pos, tok, lit = s.Scan();  // go
+	if tok != token.GO {
+		t.Errorf("bad token: got %s, expected %s", tok.String(), token.GO);
+	}
+
+	if s.ErrorCount != 0 {
+		t.Errorf("found %d errors", s.ErrorCount);
+	}
+}
+
+
+func TestIllegalChars(t *testing.T) {
+	var s scanner.Scanner;
+
+	const src = "*?*$*@*";
+	s.Init(io.StringBytes(src), &TestErrorHandler{t}, scanner.AllowIllegalChars);
+	for offs, ch := range src {
+		pos, tok, lit := s.Scan();
+		if pos.Offset != offs {
+			t.Errorf("bad position for %s: got %d, expected %d", string(lit), pos.Offset, offs);
+		}
+		if tok == token.ILLEGAL && string(lit) != string(ch) {
+			t.Errorf("bad token: got %s, expected %s", string(lit), string(ch));
+		}
+	}
+
+	if s.ErrorCount != 0 {
+		t.Errorf("found %d errors", s.ErrorCount);
+	}
+}