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authorIan Lance Taylor <ian@gcc.gnu.org>2011-12-07 01:11:29 +0000
committerIan Lance Taylor <ian@gcc.gnu.org>2011-12-07 01:11:29 +0000
commit9c63abc9a1d127f95162756467284cf76b47aff8 (patch)
tree84f27a6ab44d932e4b0455f18390b070b4de626e /libgo/go/text/scanner/scanner_test.go
parent374280238f934fa851273e2ee16ba53be890c6b8 (diff)
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libgo: Update to weekly 2011-11-09.
From-SVN: r182073
Diffstat (limited to 'libgo/go/text/scanner/scanner_test.go')
-rw-r--r--libgo/go/text/scanner/scanner_test.go563
1 files changed, 563 insertions, 0 deletions
diff --git a/libgo/go/text/scanner/scanner_test.go b/libgo/go/text/scanner/scanner_test.go
new file mode 100644
index 0000000..bb3adb5
--- /dev/null
+++ b/libgo/go/text/scanner/scanner_test.go
@@ -0,0 +1,563 @@
+// 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 (
+ "bytes"
+ "fmt"
+ "io"
+ "strings"
+ "testing"
+ "unicode/utf8"
+)
+
+// A StringReader delivers its data one string segment at a time via Read.
+type StringReader struct {
+ data []string
+ step int
+}
+
+func (r *StringReader) Read(p []byte) (n int, err error) {
+ if r.step < len(r.data) {
+ s := r.data[r.step]
+ n = copy(p, s)
+ r.step++
+ } else {
+ err = io.EOF
+ }
+ return
+}
+
+func readRuneSegments(t *testing.T, segments []string) {
+ got := ""
+ want := strings.Join(segments, "")
+ s := new(Scanner).Init(&StringReader{data: segments})
+ for {
+ ch := s.Next()
+ if ch == EOF {
+ break
+ }
+ got += string(ch)
+ }
+ if got != want {
+ t.Errorf("segments=%v got=%s want=%s", segments, got, want)
+ }
+}
+
+var segmentList = [][]string{
+ {},
+ {""},
+ {"日", "本語"},
+ {"\u65e5", "\u672c", "\u8a9e"},
+ {"\U000065e5", " ", "\U0000672c", "\U00008a9e"},
+ {"\xe6", "\x97\xa5\xe6", "\x9c\xac\xe8\xaa\x9e"},
+ {"Hello", ", ", "World", "!"},
+ {"Hello", ", ", "", "World", "!"},
+}
+
+func TestNext(t *testing.T) {
+ for _, s := range segmentList {
+ readRuneSegments(t, s)
+ }
+}
+
+type token struct {
+ tok rune
+ text string
+}
+
+var f100 = "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
+
+var tokenList = []token{
+ {Comment, "// line comments"},
+ {Comment, "//"},
+ {Comment, "////"},
+ {Comment, "// comment"},
+ {Comment, "// /* comment */"},
+ {Comment, "// // comment //"},
+ {Comment, "//" + f100},
+
+ {Comment, "// general comments"},
+ {Comment, "/**/"},
+ {Comment, "/***/"},
+ {Comment, "/* comment */"},
+ {Comment, "/* // comment */"},
+ {Comment, "/* /* comment */"},
+ {Comment, "/*\n comment\n*/"},
+ {Comment, "/*" + f100 + "*/"},
+
+ {Comment, "// identifiers"},
+ {Ident, "a"},
+ {Ident, "a0"},
+ {Ident, "foobar"},
+ {Ident, "abc123"},
+ {Ident, "LGTM"},
+ {Ident, "_"},
+ {Ident, "_abc123"},
+ {Ident, "abc123_"},
+ {Ident, "_abc_123_"},
+ {Ident, "_äöü"},
+ {Ident, "_本"},
+ {Ident, "äöü"},
+ {Ident, "本"},
+ {Ident, "a۰۱۸"},
+ {Ident, "foo६४"},
+ {Ident, "bar9876"},
+ {Ident, f100},
+
+ {Comment, "// decimal ints"},
+ {Int, "0"},
+ {Int, "1"},
+ {Int, "9"},
+ {Int, "42"},
+ {Int, "1234567890"},
+
+ {Comment, "// octal ints"},
+ {Int, "00"},
+ {Int, "01"},
+ {Int, "07"},
+ {Int, "042"},
+ {Int, "01234567"},
+
+ {Comment, "// hexadecimal ints"},
+ {Int, "0x0"},
+ {Int, "0x1"},
+ {Int, "0xf"},
+ {Int, "0x42"},
+ {Int, "0x123456789abcDEF"},
+ {Int, "0x" + f100},
+ {Int, "0X0"},
+ {Int, "0X1"},
+ {Int, "0XF"},
+ {Int, "0X42"},
+ {Int, "0X123456789abcDEF"},
+ {Int, "0X" + f100},
+
+ {Comment, "// floats"},
+ {Float, "0."},
+ {Float, "1."},
+ {Float, "42."},
+ {Float, "01234567890."},
+ {Float, ".0"},
+ {Float, ".1"},
+ {Float, ".42"},
+ {Float, ".0123456789"},
+ {Float, "0.0"},
+ {Float, "1.0"},
+ {Float, "42.0"},
+ {Float, "01234567890.0"},
+ {Float, "0e0"},
+ {Float, "1e0"},
+ {Float, "42e0"},
+ {Float, "01234567890e0"},
+ {Float, "0E0"},
+ {Float, "1E0"},
+ {Float, "42E0"},
+ {Float, "01234567890E0"},
+ {Float, "0e+10"},
+ {Float, "1e-10"},
+ {Float, "42e+10"},
+ {Float, "01234567890e-10"},
+ {Float, "0E+10"},
+ {Float, "1E-10"},
+ {Float, "42E+10"},
+ {Float, "01234567890E-10"},
+
+ {Comment, "// chars"},
+ {Char, `' '`},
+ {Char, `'a'`},
+ {Char, `'本'`},
+ {Char, `'\a'`},
+ {Char, `'\b'`},
+ {Char, `'\f'`},
+ {Char, `'\n'`},
+ {Char, `'\r'`},
+ {Char, `'\t'`},
+ {Char, `'\v'`},
+ {Char, `'\''`},
+ {Char, `'\000'`},
+ {Char, `'\777'`},
+ {Char, `'\x00'`},
+ {Char, `'\xff'`},
+ {Char, `'\u0000'`},
+ {Char, `'\ufA16'`},
+ {Char, `'\U00000000'`},
+ {Char, `'\U0000ffAB'`},
+
+ {Comment, "// strings"},
+ {String, `" "`},
+ {String, `"a"`},
+ {String, `"本"`},
+ {String, `"\a"`},
+ {String, `"\b"`},
+ {String, `"\f"`},
+ {String, `"\n"`},
+ {String, `"\r"`},
+ {String, `"\t"`},
+ {String, `"\v"`},
+ {String, `"\""`},
+ {String, `"\000"`},
+ {String, `"\777"`},
+ {String, `"\x00"`},
+ {String, `"\xff"`},
+ {String, `"\u0000"`},
+ {String, `"\ufA16"`},
+ {String, `"\U00000000"`},
+ {String, `"\U0000ffAB"`},
+ {String, `"` + f100 + `"`},
+
+ {Comment, "// raw strings"},
+ {String, "``"},
+ {String, "`\\`"},
+ {String, "`" + "\n\n/* foobar */\n\n" + "`"},
+ {String, "`" + f100 + "`"},
+
+ {Comment, "// individual characters"},
+ // NUL character is not allowed
+ {'\x01', "\x01"},
+ {' ' - 1, string(' ' - 1)},
+ {'+', "+"},
+ {'/', "/"},
+ {'.', "."},
+ {'~', "~"},
+ {'(', "("},
+}
+
+func makeSource(pattern string) *bytes.Buffer {
+ var buf bytes.Buffer
+ for _, k := range tokenList {
+ fmt.Fprintf(&buf, pattern, k.text)
+ }
+ return &buf
+}
+
+func checkTok(t *testing.T, s *Scanner, line int, got, want rune, text string) {
+ if got != want {
+ t.Fatalf("tok = %s, want %s for %q", TokenString(got), TokenString(want), text)
+ }
+ if s.Line != line {
+ t.Errorf("line = %d, want %d for %q", s.Line, line, text)
+ }
+ stext := s.TokenText()
+ if stext != text {
+ t.Errorf("text = %q, want %q", stext, text)
+ } else {
+ // check idempotency of TokenText() call
+ stext = s.TokenText()
+ if stext != text {
+ t.Errorf("text = %q, want %q (idempotency check)", stext, text)
+ }
+ }
+}
+
+func countNewlines(s string) int {
+ n := 0
+ for _, ch := range s {
+ if ch == '\n' {
+ n++
+ }
+ }
+ return n
+}
+
+func testScan(t *testing.T, mode uint) {
+ s := new(Scanner).Init(makeSource(" \t%s\n"))
+ s.Mode = mode
+ tok := s.Scan()
+ line := 1
+ for _, k := range tokenList {
+ if mode&SkipComments == 0 || k.tok != Comment {
+ checkTok(t, s, line, tok, k.tok, k.text)
+ tok = s.Scan()
+ }
+ line += countNewlines(k.text) + 1 // each token is on a new line
+ }
+ checkTok(t, s, line, tok, EOF, "")
+}
+
+func TestScan(t *testing.T) {
+ testScan(t, GoTokens)
+ testScan(t, GoTokens&^SkipComments)
+}
+
+func TestPosition(t *testing.T) {
+ src := makeSource("\t\t\t\t%s\n")
+ s := new(Scanner).Init(src)
+ s.Mode = GoTokens &^ SkipComments
+ s.Scan()
+ pos := Position{"", 4, 1, 5}
+ for _, k := range tokenList {
+ if s.Offset != pos.Offset {
+ t.Errorf("offset = %d, want %d for %q", s.Offset, pos.Offset, k.text)
+ }
+ if s.Line != pos.Line {
+ t.Errorf("line = %d, want %d for %q", s.Line, pos.Line, k.text)
+ }
+ if s.Column != pos.Column {
+ t.Errorf("column = %d, want %d for %q", s.Column, pos.Column, k.text)
+ }
+ pos.Offset += 4 + len(k.text) + 1 // 4 tabs + token bytes + newline
+ pos.Line += countNewlines(k.text) + 1 // each token is on a new line
+ s.Scan()
+ }
+ // make sure there were no token-internal errors reported by scanner
+ if s.ErrorCount != 0 {
+ t.Errorf("%d errors", s.ErrorCount)
+ }
+}
+
+func TestScanZeroMode(t *testing.T) {
+ src := makeSource("%s\n")
+ str := src.String()
+ s := new(Scanner).Init(src)
+ s.Mode = 0 // don't recognize any token classes
+ s.Whitespace = 0 // don't skip any whitespace
+ tok := s.Scan()
+ for i, ch := range str {
+ if tok != ch {
+ t.Fatalf("%d. tok = %s, want %s", i, TokenString(tok), TokenString(ch))
+ }
+ tok = s.Scan()
+ }
+ if tok != EOF {
+ t.Fatalf("tok = %s, want EOF", TokenString(tok))
+ }
+ if s.ErrorCount != 0 {
+ t.Errorf("%d errors", s.ErrorCount)
+ }
+}
+
+func testScanSelectedMode(t *testing.T, mode uint, class rune) {
+ src := makeSource("%s\n")
+ s := new(Scanner).Init(src)
+ s.Mode = mode
+ tok := s.Scan()
+ for tok != EOF {
+ if tok < 0 && tok != class {
+ t.Fatalf("tok = %s, want %s", TokenString(tok), TokenString(class))
+ }
+ tok = s.Scan()
+ }
+ if s.ErrorCount != 0 {
+ t.Errorf("%d errors", s.ErrorCount)
+ }
+}
+
+func TestScanSelectedMask(t *testing.T) {
+ testScanSelectedMode(t, 0, 0)
+ testScanSelectedMode(t, ScanIdents, Ident)
+ // Don't test ScanInts and ScanNumbers since some parts of
+ // the floats in the source look like (illegal) octal ints
+ // and ScanNumbers may return either Int or Float.
+ testScanSelectedMode(t, ScanChars, Char)
+ testScanSelectedMode(t, ScanStrings, String)
+ testScanSelectedMode(t, SkipComments, 0)
+ testScanSelectedMode(t, ScanComments, Comment)
+}
+
+func TestScanNext(t *testing.T) {
+ s := new(Scanner).Init(bytes.NewBufferString("if a == bcd /* comment */ {\n\ta += c\n} // line comment ending in eof"))
+ checkTok(t, s, 1, s.Scan(), Ident, "if")
+ checkTok(t, s, 1, s.Scan(), Ident, "a")
+ checkTok(t, s, 1, s.Scan(), '=', "=")
+ checkTok(t, s, 0, s.Next(), '=', "")
+ checkTok(t, s, 0, s.Next(), ' ', "")
+ checkTok(t, s, 0, s.Next(), 'b', "")
+ checkTok(t, s, 1, s.Scan(), Ident, "cd")
+ checkTok(t, s, 1, s.Scan(), '{', "{")
+ checkTok(t, s, 2, s.Scan(), Ident, "a")
+ checkTok(t, s, 2, s.Scan(), '+', "+")
+ checkTok(t, s, 0, s.Next(), '=', "")
+ checkTok(t, s, 2, s.Scan(), Ident, "c")
+ checkTok(t, s, 3, s.Scan(), '}', "}")
+ checkTok(t, s, 3, s.Scan(), -1, "")
+ if s.ErrorCount != 0 {
+ t.Errorf("%d errors", s.ErrorCount)
+ }
+}
+
+func TestScanWhitespace(t *testing.T) {
+ var buf bytes.Buffer
+ var ws uint64
+ // start at 1, NUL character is not allowed
+ for ch := byte(1); ch < ' '; ch++ {
+ buf.WriteByte(ch)
+ ws |= 1 << ch
+ }
+ const orig = 'x'
+ buf.WriteByte(orig)
+
+ s := new(Scanner).Init(&buf)
+ s.Mode = 0
+ s.Whitespace = ws
+ tok := s.Scan()
+ if tok != orig {
+ t.Errorf("tok = %s, want %s", TokenString(tok), TokenString(orig))
+ }
+}
+
+func testError(t *testing.T, src, pos, msg string, tok rune) {
+ s := new(Scanner).Init(bytes.NewBufferString(src))
+ errorCalled := false
+ s.Error = func(s *Scanner, m string) {
+ if !errorCalled {
+ // only look at first error
+ if p := s.Pos().String(); p != pos {
+ t.Errorf("pos = %q, want %q for %q", p, pos, src)
+ }
+ if m != msg {
+ t.Errorf("msg = %q, want %q for %q", m, msg, src)
+ }
+ errorCalled = true
+ }
+ }
+ tk := s.Scan()
+ if tk != tok {
+ t.Errorf("tok = %s, want %s for %q", TokenString(tk), TokenString(tok), src)
+ }
+ if !errorCalled {
+ t.Errorf("error handler not called for %q", src)
+ }
+ if s.ErrorCount == 0 {
+ t.Errorf("count = %d, want > 0 for %q", s.ErrorCount, src)
+ }
+}
+
+func TestError(t *testing.T) {
+ testError(t, "\x00", "1:1", "illegal character NUL", 0)
+ testError(t, "\x80", "1:1", "illegal UTF-8 encoding", utf8.RuneError)
+ testError(t, "\xff", "1:1", "illegal UTF-8 encoding", utf8.RuneError)
+
+ testError(t, "a\x00", "1:2", "illegal character NUL", Ident)
+ testError(t, "ab\x80", "1:3", "illegal UTF-8 encoding", Ident)
+ testError(t, "abc\xff", "1:4", "illegal UTF-8 encoding", Ident)
+
+ testError(t, `"a`+"\x00", "1:3", "illegal character NUL", String)
+ testError(t, `"ab`+"\x80", "1:4", "illegal UTF-8 encoding", String)
+ testError(t, `"abc`+"\xff", "1:5", "illegal UTF-8 encoding", String)
+
+ testError(t, "`a"+"\x00", "1:3", "illegal character NUL", String)
+ testError(t, "`ab"+"\x80", "1:4", "illegal UTF-8 encoding", String)
+ testError(t, "`abc"+"\xff", "1:5", "illegal UTF-8 encoding", String)
+
+ testError(t, `'\"'`, "1:3", "illegal char escape", Char)
+ testError(t, `"\'"`, "1:3", "illegal char escape", String)
+
+ testError(t, `01238`, "1:6", "illegal octal number", Int)
+ testError(t, `'aa'`, "1:4", "illegal char literal", Char)
+
+ testError(t, `'`, "1:2", "literal not terminated", Char)
+ testError(t, `'`+"\n", "1:2", "literal not terminated", Char)
+ testError(t, `"abc`, "1:5", "literal not terminated", String)
+ testError(t, `"abc`+"\n", "1:5", "literal not terminated", String)
+ testError(t, "`abc\n", "2:1", "literal not terminated", String)
+ testError(t, `/*/`, "1:4", "comment not terminated", EOF)
+}
+
+func checkPos(t *testing.T, got, want Position) {
+ if got.Offset != want.Offset || got.Line != want.Line || got.Column != want.Column {
+ t.Errorf("got offset, line, column = %d, %d, %d; want %d, %d, %d",
+ got.Offset, got.Line, got.Column, want.Offset, want.Line, want.Column)
+ }
+}
+
+func checkNextPos(t *testing.T, s *Scanner, offset, line, column int, char rune) {
+ if ch := s.Next(); ch != char {
+ t.Errorf("ch = %s, want %s", TokenString(ch), TokenString(char))
+ }
+ want := Position{Offset: offset, Line: line, Column: column}
+ checkPos(t, s.Pos(), want)
+}
+
+func checkScanPos(t *testing.T, s *Scanner, offset, line, column int, char rune) {
+ want := Position{Offset: offset, Line: line, Column: column}
+ checkPos(t, s.Pos(), want)
+ if ch := s.Scan(); ch != char {
+ t.Errorf("ch = %s, want %s", TokenString(ch), TokenString(char))
+ if string(ch) != s.TokenText() {
+ t.Errorf("tok = %q, want %q", s.TokenText(), string(ch))
+ }
+ }
+ checkPos(t, s.Position, want)
+}
+
+func TestPos(t *testing.T) {
+ // corner case: empty source
+ s := new(Scanner).Init(bytes.NewBufferString(""))
+ checkPos(t, s.Pos(), Position{Offset: 0, Line: 1, Column: 1})
+ s.Peek() // peek doesn't affect the position
+ checkPos(t, s.Pos(), Position{Offset: 0, Line: 1, Column: 1})
+
+ // corner case: source with only a newline
+ s = new(Scanner).Init(bytes.NewBufferString("\n"))
+ checkPos(t, s.Pos(), Position{Offset: 0, Line: 1, Column: 1})
+ checkNextPos(t, s, 1, 2, 1, '\n')
+ // after EOF position doesn't change
+ for i := 10; i > 0; i-- {
+ checkScanPos(t, s, 1, 2, 1, EOF)
+ }
+ if s.ErrorCount != 0 {
+ t.Errorf("%d errors", s.ErrorCount)
+ }
+
+ // corner case: source with only a single character
+ s = new(Scanner).Init(bytes.NewBufferString("本"))
+ checkPos(t, s.Pos(), Position{Offset: 0, Line: 1, Column: 1})
+ checkNextPos(t, s, 3, 1, 2, '本')
+ // after EOF position doesn't change
+ for i := 10; i > 0; i-- {
+ checkScanPos(t, s, 3, 1, 2, EOF)
+ }
+ if s.ErrorCount != 0 {
+ t.Errorf("%d errors", s.ErrorCount)
+ }
+
+ // positions after calling Next
+ s = new(Scanner).Init(bytes.NewBufferString(" foo६४ \n\n本語\n"))
+ checkNextPos(t, s, 1, 1, 2, ' ')
+ s.Peek() // peek doesn't affect the position
+ checkNextPos(t, s, 2, 1, 3, ' ')
+ checkNextPos(t, s, 3, 1, 4, 'f')
+ checkNextPos(t, s, 4, 1, 5, 'o')
+ checkNextPos(t, s, 5, 1, 6, 'o')
+ checkNextPos(t, s, 8, 1, 7, '६')
+ checkNextPos(t, s, 11, 1, 8, '४')
+ checkNextPos(t, s, 12, 1, 9, ' ')
+ checkNextPos(t, s, 13, 1, 10, ' ')
+ checkNextPos(t, s, 14, 2, 1, '\n')
+ checkNextPos(t, s, 15, 3, 1, '\n')
+ checkNextPos(t, s, 18, 3, 2, '本')
+ checkNextPos(t, s, 21, 3, 3, '語')
+ checkNextPos(t, s, 22, 4, 1, '\n')
+ // after EOF position doesn't change
+ for i := 10; i > 0; i-- {
+ checkScanPos(t, s, 22, 4, 1, EOF)
+ }
+ if s.ErrorCount != 0 {
+ t.Errorf("%d errors", s.ErrorCount)
+ }
+
+ // positions after calling Scan
+ s = new(Scanner).Init(bytes.NewBufferString("abc\n本語\n\nx"))
+ s.Mode = 0
+ s.Whitespace = 0
+ checkScanPos(t, s, 0, 1, 1, 'a')
+ s.Peek() // peek doesn't affect the position
+ checkScanPos(t, s, 1, 1, 2, 'b')
+ checkScanPos(t, s, 2, 1, 3, 'c')
+ checkScanPos(t, s, 3, 1, 4, '\n')
+ checkScanPos(t, s, 4, 2, 1, '本')
+ checkScanPos(t, s, 7, 2, 2, '語')
+ checkScanPos(t, s, 10, 2, 3, '\n')
+ checkScanPos(t, s, 11, 3, 1, '\n')
+ checkScanPos(t, s, 12, 4, 1, 'x')
+ // after EOF position doesn't change
+ for i := 10; i > 0; i-- {
+ checkScanPos(t, s, 13, 4, 2, EOF)
+ }
+ if s.ErrorCount != 0 {
+ t.Errorf("%d errors", s.ErrorCount)
+ }
+}