| // 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/token" |
| "io/ioutil" |
| "os" |
| "path/filepath" |
| "runtime" |
| "testing" |
| ) |
| |
| var fset = token.NewFileSet() |
| |
| 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 |
| {token.COMMENT, "/* a comment */", special}, |
| {token.COMMENT, "// a comment \n", special}, |
| {token.COMMENT, "/*\r*/", special}, |
| {token.COMMENT, "//\r\n", special}, |
| |
| // Identifiers and basic type literals |
| {token.IDENT, "foobar", literal}, |
| {token.IDENT, "a۰۱۸", literal}, |
| {token.IDENT, "foo६४", literal}, |
| {token.IDENT, "bar9876", literal}, |
| {token.IDENT, "ŝ", literal}, // was bug (issue 4000) |
| {token.IDENT, "ŝfoo", literal}, // was bug (issue 4000) |
| {token.INT, "0", literal}, |
| {token.INT, "1", literal}, |
| {token.INT, "123456789012345678890", literal}, |
| {token.INT, "01234567", literal}, |
| {token.INT, "0xcafebabe", literal}, |
| {token.FLOAT, "0.", literal}, |
| {token.FLOAT, ".0", literal}, |
| {token.FLOAT, "3.14159265", literal}, |
| {token.FLOAT, "1e0", literal}, |
| {token.FLOAT, "1e+100", literal}, |
| {token.FLOAT, "1e-100", literal}, |
| {token.FLOAT, "2.71828e-1000", literal}, |
| {token.IMAG, "0i", literal}, |
| {token.IMAG, "1i", literal}, |
| {token.IMAG, "012345678901234567889i", literal}, |
| {token.IMAG, "123456789012345678890i", literal}, |
| {token.IMAG, "0.i", literal}, |
| {token.IMAG, ".0i", literal}, |
| {token.IMAG, "3.14159265i", literal}, |
| {token.IMAG, "1e0i", literal}, |
| {token.IMAG, "1e+100i", literal}, |
| {token.IMAG, "1e-100i", literal}, |
| {token.IMAG, "2.71828e-1000i", literal}, |
| {token.CHAR, "'a'", literal}, |
| {token.CHAR, "'\\000'", literal}, |
| {token.CHAR, "'\\xFF'", literal}, |
| {token.CHAR, "'\\uff16'", literal}, |
| {token.CHAR, "'\\U0000ff16'", literal}, |
| {token.STRING, "`foobar`", literal}, |
| {token.STRING, "`" + `foo |
| bar` + |
| "`", |
| literal, |
| }, |
| {token.STRING, "`\r`", literal}, |
| {token.STRING, "`foo\r\nbar`", literal}, |
| |
| // Operators and delimiters |
| {token.ADD, "+", operator}, |
| {token.SUB, "-", operator}, |
| {token.MUL, "*", operator}, |
| {token.QUO, "/", operator}, |
| {token.REM, "%", operator}, |
| |
| {token.AND, "&", operator}, |
| {token.OR, "|", operator}, |
| {token.XOR, "^", operator}, |
| {token.SHL, "<<", operator}, |
| {token.SHR, ">>", operator}, |
| {token.AND_NOT, "&^", operator}, |
| |
| {token.ADD_ASSIGN, "+=", operator}, |
| {token.SUB_ASSIGN, "-=", operator}, |
| {token.MUL_ASSIGN, "*=", operator}, |
| {token.QUO_ASSIGN, "/=", operator}, |
| {token.REM_ASSIGN, "%=", operator}, |
| |
| {token.AND_ASSIGN, "&=", operator}, |
| {token.OR_ASSIGN, "|=", operator}, |
| {token.XOR_ASSIGN, "^=", operator}, |
| {token.SHL_ASSIGN, "<<=", operator}, |
| {token.SHR_ASSIGN, ">>=", operator}, |
| {token.AND_NOT_ASSIGN, "&^=", operator}, |
| |
| {token.LAND, "&&", operator}, |
| {token.LOR, "||", operator}, |
| {token.ARROW, "<-", operator}, |
| {token.INC, "++", operator}, |
| {token.DEC, "--", operator}, |
| |
| {token.EQL, "==", operator}, |
| {token.LSS, "<", operator}, |
| {token.GTR, ">", operator}, |
| {token.ASSIGN, "=", operator}, |
| {token.NOT, "!", operator}, |
| |
| {token.NEQ, "!=", operator}, |
| {token.LEQ, "<=", operator}, |
| {token.GEQ, ">=", operator}, |
| {token.DEFINE, ":=", operator}, |
| {token.ELLIPSIS, "...", operator}, |
| |
| {token.LPAREN, "(", operator}, |
| {token.LBRACK, "[", operator}, |
| {token.LBRACE, "{", operator}, |
| {token.COMMA, ",", operator}, |
| {token.PERIOD, ".", operator}, |
| |
| {token.RPAREN, ")", operator}, |
| {token.RBRACK, "]", operator}, |
| {token.RBRACE, "}", operator}, |
| {token.SEMICOLON, ";", operator}, |
| {token.COLON, ":", operator}, |
| |
| // Keywords |
| {token.BREAK, "break", keyword}, |
| {token.CASE, "case", keyword}, |
| {token.CHAN, "chan", keyword}, |
| {token.CONST, "const", keyword}, |
| {token.CONTINUE, "continue", keyword}, |
| |
| {token.DEFAULT, "default", keyword}, |
| {token.DEFER, "defer", keyword}, |
| {token.ELSE, "else", keyword}, |
| {token.FALLTHROUGH, "fallthrough", keyword}, |
| {token.FOR, "for", keyword}, |
| |
| {token.FUNC, "func", keyword}, |
| {token.GO, "go", keyword}, |
| {token.GOTO, "goto", keyword}, |
| {token.IF, "if", keyword}, |
| {token.IMPORT, "import", keyword}, |
| |
| {token.INTERFACE, "interface", keyword}, |
| {token.MAP, "map", keyword}, |
| {token.PACKAGE, "package", keyword}, |
| {token.RANGE, "range", keyword}, |
| {token.RETURN, "return", keyword}, |
| |
| {token.SELECT, "select", keyword}, |
| {token.STRUCT, "struct", keyword}, |
| {token.SWITCH, "switch", keyword}, |
| {token.TYPE, "type", keyword}, |
| {token.VAR, "var", keyword}, |
| } |
| |
| const whitespace = " \t \n\n\n" // to separate tokens |
| |
| var source = func() []byte { |
| var src []byte |
| for _, t := range tokens { |
| src = append(src, t.lit...) |
| src = append(src, whitespace...) |
| } |
| return src |
| }() |
| |
| func newlineCount(s string) int { |
| n := 0 |
| for i := 0; i < len(s); i++ { |
| if s[i] == '\n' { |
| n++ |
| } |
| } |
| return n |
| } |
| |
| func checkPos(t *testing.T, lit string, p token.Pos, expected token.Position) { |
| pos := fset.Position(p) |
| if pos.Filename != expected.Filename { |
| t.Errorf("bad filename for %q: got %s, expected %s", lit, pos.Filename, expected.Filename) |
| } |
| if pos.Offset != expected.Offset { |
| t.Errorf("bad position for %q: got %d, expected %d", lit, pos.Offset, expected.Offset) |
| } |
| if pos.Line != expected.Line { |
| t.Errorf("bad line for %q: got %d, expected %d", lit, pos.Line, expected.Line) |
| } |
| if pos.Column != expected.Column { |
| t.Errorf("bad column for %q: got %d, expected %d", lit, pos.Column, expected.Column) |
| } |
| } |
| |
| // Verify that calling Scan() provides the correct results. |
| func TestScan(t *testing.T) { |
| whitespace_linecount := newlineCount(whitespace) |
| |
| // error handler |
| eh := func(_ token.Position, msg string) { |
| t.Errorf("error handler called (msg = %s)", msg) |
| } |
| |
| // verify scan |
| var s Scanner |
| s.Init(fset.AddFile("", fset.Base(), len(source)), source, eh, ScanComments|dontInsertSemis) |
| |
| // set up expected position |
| epos := token.Position{ |
| Filename: "", |
| Offset: 0, |
| Line: 1, |
| Column: 1, |
| } |
| |
| index := 0 |
| for { |
| pos, tok, lit := s.Scan() |
| |
| // check position |
| if tok == token.EOF { |
| // correction for EOF |
| epos.Line = newlineCount(string(source)) |
| epos.Column = 2 |
| } |
| checkPos(t, lit, pos, epos) |
| |
| // check token |
| e := elt{token.EOF, "", special} |
| if index < len(tokens) { |
| e = tokens[index] |
| index++ |
| } |
| if tok != e.tok { |
| t.Errorf("bad token for %q: got %s, expected %s", lit, tok, e.tok) |
| } |
| |
| // check token class |
| if tokenclass(tok) != e.class { |
| t.Errorf("bad class for %q: got %d, expected %d", lit, tokenclass(tok), e.class) |
| } |
| |
| // check literal |
| elit := "" |
| switch e.tok { |
| case token.COMMENT: |
| // no CRs in comments |
| elit = string(stripCR([]byte(e.lit))) |
| //-style comment literal doesn't contain newline |
| if elit[1] == '/' { |
| elit = elit[0 : len(elit)-1] |
| } |
| case token.IDENT: |
| elit = e.lit |
| case token.SEMICOLON: |
| elit = ";" |
| default: |
| if e.tok.IsLiteral() { |
| // no CRs in raw string literals |
| elit = e.lit |
| if elit[0] == '`' { |
| elit = string(stripCR([]byte(elit))) |
| } |
| } else if e.tok.IsKeyword() { |
| elit = e.lit |
| } |
| } |
| if lit != elit { |
| t.Errorf("bad literal for %q: got %q, expected %q", lit, lit, elit) |
| } |
| |
| if tok == token.EOF { |
| break |
| } |
| |
| // update position |
| epos.Offset += len(e.lit) + len(whitespace) |
| epos.Line += newlineCount(e.lit) + whitespace_linecount |
| |
| } |
| |
| if s.ErrorCount != 0 { |
| t.Errorf("found %d errors", s.ErrorCount) |
| } |
| } |
| |
| func checkSemi(t *testing.T, line string, mode Mode) { |
| var S Scanner |
| file := fset.AddFile("TestSemis", fset.Base(), len(line)) |
| S.Init(file, []byte(line), nil, mode) |
| pos, tok, lit := S.Scan() |
| for tok != token.EOF { |
| if tok == token.ILLEGAL { |
| // the illegal token literal indicates what |
| // kind of semicolon literal to expect |
| semiLit := "\n" |
| if lit[0] == '#' { |
| semiLit = ";" |
| } |
| // next token must be a semicolon |
| semiPos := file.Position(pos) |
| semiPos.Offset++ |
| semiPos.Column++ |
| pos, tok, lit = S.Scan() |
| if tok == token.SEMICOLON { |
| if lit != semiLit { |
| t.Errorf(`bad literal for %q: got %q, expected %q`, line, lit, semiLit) |
| } |
| checkPos(t, line, pos, semiPos) |
| } else { |
| t.Errorf("bad token for %q: got %s, expected ;", line, tok) |
| } |
| } else if tok == token.SEMICOLON { |
| t.Errorf("bad token for %q: got ;, expected no ;", line) |
| } |
| pos, tok, lit = S.Scan() |
| } |
| } |
| |
| var lines = []string{ |
| // # indicates a semicolon present in the source |
| // $ indicates an automatically inserted semicolon |
| "", |
| "\ufeff#;", // first BOM is ignored |
| "#;", |
| "foo$\n", |
| "123$\n", |
| "1.2$\n", |
| "'x'$\n", |
| `"x"` + "$\n", |
| "`x`$\n", |
| |
| "+\n", |
| "-\n", |
| "*\n", |
| "/\n", |
| "%\n", |
| |
| "&\n", |
| "|\n", |
| "^\n", |
| "<<\n", |
| ">>\n", |
| "&^\n", |
| |
| "+=\n", |
| "-=\n", |
| "*=\n", |
| "/=\n", |
| "%=\n", |
| |
| "&=\n", |
| "|=\n", |
| "^=\n", |
| "<<=\n", |
| ">>=\n", |
| "&^=\n", |
| |
| "&&\n", |
| "||\n", |
| "<-\n", |
| "++$\n", |
| "--$\n", |
| |
| "==\n", |
| "<\n", |
| ">\n", |
| "=\n", |
| "!\n", |
| |
| "!=\n", |
| "<=\n", |
| ">=\n", |
| ":=\n", |
| "...\n", |
| |
| "(\n", |
| "[\n", |
| "{\n", |
| ",\n", |
| ".\n", |
| |
| ")$\n", |
| "]$\n", |
| "}$\n", |
| "#;\n", |
| ":\n", |
| |
| "break$\n", |
| "case\n", |
| "chan\n", |
| "const\n", |
| "continue$\n", |
| |
| "default\n", |
| "defer\n", |
| "else\n", |
| "fallthrough$\n", |
| "for\n", |
| |
| "func\n", |
| "go\n", |
| "goto\n", |
| "if\n", |
| "import\n", |
| |
| "interface\n", |
| "map\n", |
| "package\n", |
| "range\n", |
| "return$\n", |
| |
| "select\n", |
| "struct\n", |
| "switch\n", |
| "type\n", |
| "var\n", |
| |
| "foo$//comment\n", |
| "foo$//comment", |
| "foo$/*comment*/\n", |
| "foo$/*\n*/", |
| "foo$/*comment*/ \n", |
| "foo$/*\n*/ ", |
| |
| "foo $// comment\n", |
| "foo $// comment", |
| "foo $/*comment*/\n", |
| "foo $/*\n*/", |
| "foo $/* */ /* \n */ bar$/**/\n", |
| "foo $/*0*/ /*1*/ /*2*/\n", |
| |
| "foo $/*comment*/ \n", |
| "foo $/*0*/ /*1*/ /*2*/ \n", |
| "foo $/**/ /*-------------*/ /*----\n*/bar $/* \n*/baa$\n", |
| "foo $/* an EOF terminates a line */", |
| "foo $/* an EOF terminates a line */ /*", |
| "foo $/* an EOF terminates a line */ //", |
| |
| "package main$\n\nfunc main() {\n\tif {\n\t\treturn /* */ }$\n}$\n", |
| "package main$", |
| } |
| |
| func TestSemis(t *testing.T) { |
| for _, line := range lines { |
| checkSemi(t, line, 0) |
| checkSemi(t, line, ScanComments) |
| |
| // if the input ended in newlines, the input must tokenize the |
| // same with or without those newlines |
| for i := len(line) - 1; i >= 0 && line[i] == '\n'; i-- { |
| checkSemi(t, line[0:i], 0) |
| checkSemi(t, line[0:i], ScanComments) |
| } |
| } |
| } |
| |
| type segment struct { |
| srcline string // a line of source text |
| filename string // filename for current token |
| line int // line number for current token |
| } |
| |
| var segments = []segment{ |
| // exactly one token per line since the test consumes one token per segment |
| {" line1", filepath.Join("dir", "TestLineComments"), 1}, |
| {"\nline2", filepath.Join("dir", "TestLineComments"), 2}, |
| {"\nline3 //line File1.go:100", filepath.Join("dir", "TestLineComments"), 3}, // bad line comment, ignored |
| {"\nline4", filepath.Join("dir", "TestLineComments"), 4}, |
| {"\n//line File1.go:100\n line100", filepath.Join("dir", "File1.go"), 100}, |
| {"\n//line \t :42\n line1", "", 42}, |
| {"\n//line File2.go:200\n line200", filepath.Join("dir", "File2.go"), 200}, |
| {"\n//line foo\t:42\n line42", filepath.Join("dir", "foo"), 42}, |
| {"\n //line foo:42\n line44", filepath.Join("dir", "foo"), 44}, // bad line comment, ignored |
| {"\n//line foo 42\n line46", filepath.Join("dir", "foo"), 46}, // bad line comment, ignored |
| {"\n//line foo:42 extra text\n line48", filepath.Join("dir", "foo"), 48}, // bad line comment, ignored |
| {"\n//line ./foo:42\n line42", filepath.Join("dir", "foo"), 42}, |
| {"\n//line a/b/c/File1.go:100\n line100", filepath.Join("dir", "a", "b", "c", "File1.go"), 100}, |
| } |
| |
| var unixsegments = []segment{ |
| {"\n//line /bar:42\n line42", "/bar", 42}, |
| } |
| |
| var winsegments = []segment{ |
| {"\n//line c:\\bar:42\n line42", "c:\\bar", 42}, |
| {"\n//line c:\\dir\\File1.go:100\n line100", "c:\\dir\\File1.go", 100}, |
| } |
| |
| // Verify that comments of the form "//line filename:line" are interpreted correctly. |
| func TestLineComments(t *testing.T) { |
| segs := segments |
| if runtime.GOOS == "windows" { |
| segs = append(segs, winsegments...) |
| } else { |
| segs = append(segs, unixsegments...) |
| } |
| |
| // make source |
| var src string |
| for _, e := range segs { |
| src += e.srcline |
| } |
| |
| // verify scan |
| var S Scanner |
| file := fset.AddFile(filepath.Join("dir", "TestLineComments"), fset.Base(), len(src)) |
| S.Init(file, []byte(src), nil, dontInsertSemis) |
| for _, s := range segs { |
| p, _, lit := S.Scan() |
| pos := file.Position(p) |
| checkPos(t, lit, p, token.Position{ |
| Filename: s.filename, |
| Offset: pos.Offset, |
| Line: s.line, |
| Column: pos.Column, |
| }) |
| } |
| |
| if S.ErrorCount != 0 { |
| t.Errorf("found %d errors", S.ErrorCount) |
| } |
| } |
| |
| // Verify that initializing the same scanner more than once works correctly. |
| func TestInit(t *testing.T) { |
| var s Scanner |
| |
| // 1st init |
| src1 := "if true { }" |
| f1 := fset.AddFile("src1", fset.Base(), len(src1)) |
| s.Init(f1, []byte(src1), nil, dontInsertSemis) |
| if f1.Size() != len(src1) { |
| t.Errorf("bad file size: got %d, expected %d", f1.Size(), len(src1)) |
| } |
| s.Scan() // if |
| s.Scan() // true |
| _, tok, _ := s.Scan() // { |
| if tok != token.LBRACE { |
| t.Errorf("bad token: got %s, expected %s", tok, token.LBRACE) |
| } |
| |
| // 2nd init |
| src2 := "go true { ]" |
| f2 := fset.AddFile("src2", fset.Base(), len(src2)) |
| s.Init(f2, []byte(src2), nil, dontInsertSemis) |
| if f2.Size() != len(src2) { |
| t.Errorf("bad file size: got %d, expected %d", f2.Size(), len(src2)) |
| } |
| _, tok, _ = s.Scan() // go |
| if tok != token.GO { |
| t.Errorf("bad token: got %s, expected %s", tok, token.GO) |
| } |
| |
| if s.ErrorCount != 0 { |
| t.Errorf("found %d errors", s.ErrorCount) |
| } |
| } |
| |
| func TestStdErrorHander(t *testing.T) { |
| const src = "@\n" + // illegal character, cause an error |
| "@ @\n" + // two errors on the same line |
| "//line File2:20\n" + |
| "@\n" + // different file, but same line |
| "//line File2:1\n" + |
| "@ @\n" + // same file, decreasing line number |
| "//line File1:1\n" + |
| "@ @ @" // original file, line 1 again |
| |
| var list ErrorList |
| eh := func(pos token.Position, msg string) { list.Add(pos, msg) } |
| |
| var s Scanner |
| s.Init(fset.AddFile("File1", fset.Base(), len(src)), []byte(src), eh, dontInsertSemis) |
| for { |
| if _, tok, _ := s.Scan(); tok == token.EOF { |
| break |
| } |
| } |
| |
| if len(list) != s.ErrorCount { |
| t.Errorf("found %d errors, expected %d", len(list), s.ErrorCount) |
| } |
| |
| if len(list) != 9 { |
| t.Errorf("found %d raw errors, expected 9", len(list)) |
| PrintError(os.Stderr, list) |
| } |
| |
| list.Sort() |
| if len(list) != 9 { |
| t.Errorf("found %d sorted errors, expected 9", len(list)) |
| PrintError(os.Stderr, list) |
| } |
| |
| list.RemoveMultiples() |
| if len(list) != 4 { |
| t.Errorf("found %d one-per-line errors, expected 4", len(list)) |
| PrintError(os.Stderr, list) |
| } |
| } |
| |
| type errorCollector struct { |
| cnt int // number of errors encountered |
| msg string // last error message encountered |
| pos token.Position // last error position encountered |
| } |
| |
| func checkError(t *testing.T, src string, tok token.Token, pos int, lit, err string) { |
| var s Scanner |
| var h errorCollector |
| eh := func(pos token.Position, msg string) { |
| h.cnt++ |
| h.msg = msg |
| h.pos = pos |
| } |
| s.Init(fset.AddFile("", fset.Base(), len(src)), []byte(src), eh, ScanComments|dontInsertSemis) |
| _, tok0, lit0 := s.Scan() |
| if tok0 != tok { |
| t.Errorf("%q: got %s, expected %s", src, tok0, tok) |
| } |
| if tok0 != token.ILLEGAL && lit0 != lit { |
| t.Errorf("%q: got literal %q, expected %q", src, lit0, lit) |
| } |
| cnt := 0 |
| if err != "" { |
| cnt = 1 |
| } |
| if h.cnt != cnt { |
| t.Errorf("%q: got cnt %d, expected %d", src, h.cnt, cnt) |
| } |
| if h.msg != err { |
| t.Errorf("%q: got msg %q, expected %q", src, h.msg, err) |
| } |
| if h.pos.Offset != pos { |
| t.Errorf("%q: got offset %d, expected %d", src, h.pos.Offset, pos) |
| } |
| } |
| |
| var errors = []struct { |
| src string |
| tok token.Token |
| pos int |
| lit string |
| err string |
| }{ |
| {"\a", token.ILLEGAL, 0, "", "illegal character U+0007"}, |
| {`#`, token.ILLEGAL, 0, "", "illegal character U+0023 '#'"}, |
| {`…`, token.ILLEGAL, 0, "", "illegal character U+2026 '…'"}, |
| {`' '`, token.CHAR, 0, `' '`, ""}, |
| {`''`, token.CHAR, 0, `''`, "illegal rune literal"}, |
| {`'12'`, token.CHAR, 0, `'12'`, "illegal rune literal"}, |
| {`'123'`, token.CHAR, 0, `'123'`, "illegal rune literal"}, |
| {`'\0'`, token.CHAR, 3, `'\0'`, "illegal character U+0027 ''' in escape sequence"}, |
| {`'\07'`, token.CHAR, 4, `'\07'`, "illegal character U+0027 ''' in escape sequence"}, |
| {`'\8'`, token.CHAR, 2, `'\8'`, "unknown escape sequence"}, |
| {`'\08'`, token.CHAR, 3, `'\08'`, "illegal character U+0038 '8' in escape sequence"}, |
| {`'\x'`, token.CHAR, 3, `'\x'`, "illegal character U+0027 ''' in escape sequence"}, |
| {`'\x0'`, token.CHAR, 4, `'\x0'`, "illegal character U+0027 ''' in escape sequence"}, |
| {`'\x0g'`, token.CHAR, 4, `'\x0g'`, "illegal character U+0067 'g' in escape sequence"}, |
| {`'\u'`, token.CHAR, 3, `'\u'`, "illegal character U+0027 ''' in escape sequence"}, |
| {`'\u0'`, token.CHAR, 4, `'\u0'`, "illegal character U+0027 ''' in escape sequence"}, |
| {`'\u00'`, token.CHAR, 5, `'\u00'`, "illegal character U+0027 ''' in escape sequence"}, |
| {`'\u000'`, token.CHAR, 6, `'\u000'`, "illegal character U+0027 ''' in escape sequence"}, |
| {`'\u000`, token.CHAR, 6, `'\u000`, "escape sequence not terminated"}, |
| {`'\u0000'`, token.CHAR, 0, `'\u0000'`, ""}, |
| {`'\U'`, token.CHAR, 3, `'\U'`, "illegal character U+0027 ''' in escape sequence"}, |
| {`'\U0'`, token.CHAR, 4, `'\U0'`, "illegal character U+0027 ''' in escape sequence"}, |
| {`'\U00'`, token.CHAR, 5, `'\U00'`, "illegal character U+0027 ''' in escape sequence"}, |
| {`'\U000'`, token.CHAR, 6, `'\U000'`, "illegal character U+0027 ''' in escape sequence"}, |
| {`'\U0000'`, token.CHAR, 7, `'\U0000'`, "illegal character U+0027 ''' in escape sequence"}, |
| {`'\U00000'`, token.CHAR, 8, `'\U00000'`, "illegal character U+0027 ''' in escape sequence"}, |
| {`'\U000000'`, token.CHAR, 9, `'\U000000'`, "illegal character U+0027 ''' in escape sequence"}, |
| {`'\U0000000'`, token.CHAR, 10, `'\U0000000'`, "illegal character U+0027 ''' in escape sequence"}, |
| {`'\U0000000`, token.CHAR, 10, `'\U0000000`, "escape sequence not terminated"}, |
| {`'\U00000000'`, token.CHAR, 0, `'\U00000000'`, ""}, |
| {`'\Uffffffff'`, token.CHAR, 2, `'\Uffffffff'`, "escape sequence is invalid Unicode code point"}, |
| {`'`, token.CHAR, 0, `'`, "rune literal not terminated"}, |
| {`'\`, token.CHAR, 2, `'\`, "escape sequence not terminated"}, |
| {"'\n", token.CHAR, 0, "'", "rune literal not terminated"}, |
| {"'\n ", token.CHAR, 0, "'", "rune literal not terminated"}, |
| {`""`, token.STRING, 0, `""`, ""}, |
| {`"abc`, token.STRING, 0, `"abc`, "string literal not terminated"}, |
| {"\"abc\n", token.STRING, 0, `"abc`, "string literal not terminated"}, |
| {"\"abc\n ", token.STRING, 0, `"abc`, "string literal not terminated"}, |
| {"``", token.STRING, 0, "``", ""}, |
| {"`", token.STRING, 0, "`", "raw string literal not terminated"}, |
| {"/**/", token.COMMENT, 0, "/**/", ""}, |
| {"/*", token.COMMENT, 0, "/*", "comment not terminated"}, |
| {"077", token.INT, 0, "077", ""}, |
| {"078.", token.FLOAT, 0, "078.", ""}, |
| {"07801234567.", token.FLOAT, 0, "07801234567.", ""}, |
| {"078e0", token.FLOAT, 0, "078e0", ""}, |
| {"0E", token.FLOAT, 0, "0E", "illegal floating-point exponent"}, // issue 17621 |
| {"078", token.INT, 0, "078", "illegal octal number"}, |
| {"07800000009", token.INT, 0, "07800000009", "illegal octal number"}, |
| {"0x", token.INT, 0, "0x", "illegal hexadecimal number"}, |
| {"0X", token.INT, 0, "0X", "illegal hexadecimal number"}, |
| {"\"abc\x00def\"", token.STRING, 4, "\"abc\x00def\"", "illegal character NUL"}, |
| {"\"abc\x80def\"", token.STRING, 4, "\"abc\x80def\"", "illegal UTF-8 encoding"}, |
| {"\ufeff\ufeff", token.ILLEGAL, 3, "\ufeff\ufeff", "illegal byte order mark"}, // only first BOM is ignored |
| {"//\ufeff", token.COMMENT, 2, "//\ufeff", "illegal byte order mark"}, // only first BOM is ignored |
| {"'\ufeff" + `'`, token.CHAR, 1, "'\ufeff" + `'`, "illegal byte order mark"}, // only first BOM is ignored |
| {`"` + "abc\ufeffdef" + `"`, token.STRING, 4, `"` + "abc\ufeffdef" + `"`, "illegal byte order mark"}, // only first BOM is ignored |
| } |
| |
| func TestScanErrors(t *testing.T) { |
| for _, e := range errors { |
| checkError(t, e.src, e.tok, e.pos, e.lit, e.err) |
| } |
| } |
| |
| // Verify that no comments show up as literal values when skipping comments. |
| func TestIssue10213(t *testing.T) { |
| var src = ` |
| var ( |
| A = 1 // foo |
| ) |
| |
| var ( |
| B = 2 |
| // foo |
| ) |
| |
| var C = 3 // foo |
| |
| var D = 4 |
| // foo |
| |
| func anycode() { |
| // foo |
| } |
| ` |
| var s Scanner |
| s.Init(fset.AddFile("", fset.Base(), len(src)), []byte(src), nil, 0) |
| for { |
| pos, tok, lit := s.Scan() |
| class := tokenclass(tok) |
| if lit != "" && class != keyword && class != literal && tok != token.SEMICOLON { |
| t.Errorf("%s: tok = %s, lit = %q", fset.Position(pos), tok, lit) |
| } |
| if tok <= token.EOF { |
| break |
| } |
| } |
| } |
| |
| func BenchmarkScan(b *testing.B) { |
| b.StopTimer() |
| fset := token.NewFileSet() |
| file := fset.AddFile("", fset.Base(), len(source)) |
| var s Scanner |
| b.StartTimer() |
| for i := 0; i < b.N; i++ { |
| s.Init(file, source, nil, ScanComments) |
| for { |
| _, tok, _ := s.Scan() |
| if tok == token.EOF { |
| break |
| } |
| } |
| } |
| } |
| |
| func BenchmarkScanFile(b *testing.B) { |
| b.StopTimer() |
| const filename = "scanner.go" |
| src, err := ioutil.ReadFile(filename) |
| if err != nil { |
| panic(err) |
| } |
| fset := token.NewFileSet() |
| file := fset.AddFile(filename, fset.Base(), len(src)) |
| b.SetBytes(int64(len(src))) |
| var s Scanner |
| b.StartTimer() |
| for i := 0; i < b.N; i++ { |
| s.Init(file, src, nil, ScanComments) |
| for { |
| _, tok, _ := s.Scan() |
| if tok == token.EOF { |
| break |
| } |
| } |
| } |
| } |