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-rw-r--r--src/go/scanner/scanner_test.go775
1 files changed, 775 insertions, 0 deletions
diff --git a/src/go/scanner/scanner_test.go b/src/go/scanner/scanner_test.go
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+++ b/src/go/scanner/scanner_test.go
@@ -0,0 +1,775 @@
+// 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", ""},
+ {"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)
+ }
+}
+
+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
+ }
+ }
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-03 06:28:59 +0000