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go/scanner: comply with spec changes (do not allow NUL chars)

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and complain about illegal UTF-8 code sequences

R=rsc
CC=golang-dev
https://golang.org/cl/209043
This commit is contained in:
Robert Griesemer 2010-02-16 17:39:44 -08:00
parent 401062f720
commit 855986d54f
2 changed files with 24 additions and 16 deletions
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5
src/pkg/go/scanner/scanner.go
View File

@ -48,12 +48,17 @@ func (S *Scanner) next() {
S.pos.Column++
r, w := int(S.src[S.offset]), 1
switch {
case r == 0:
S.error(S.pos, "illegal character NUL")
case r == '\n':
S.pos.Line++
S.pos.Column = 0
case r >= 0x80:
// not ASCII
r, w = utf8.DecodeRune(S.src[S.offset:])
if r == utf8.RuneError && w == 1 {
S.error(S.pos, "illegal UTF-8 encoding")
}
}
S.offset += w
S.ch = r

35
src/pkg/go/scanner/scanner_test.go
View File

@ -551,7 +551,7 @@ func (h *errorCollector) Error(pos token.Position, msg string) {
}
func checkError(t *testing.T, src string, tok token.Token, err string) {
func checkError(t *testing.T, src string, tok token.Token, pos int, err string) {
var s Scanner
var h errorCollector
s.Init("", strings.Bytes(src), &h, ScanComments)
@ -573,8 +573,8 @@ func checkError(t *testing.T, src string, tok token.Token, err string) {
if h.msg != err {
t.Errorf("%q: got msg %q, expected %q", src, h.msg, err)
}
if h.pos.Offset != 0 {
t.Errorf("%q: got offset %d, expected 0", src, h.pos.Offset)
if h.pos.Offset != pos {
t.Errorf("%q: got offset %d, expected %d", src, h.pos.Offset, pos)
}
}
@ -582,27 +582,30 @@ func checkError(t *testing.T, src string, tok token.Token, err string) {
type srcerr struct {
src string
tok token.Token
pos int
err string
}
var errors = []srcerr{
srcerr{"\"\"", token.STRING, ""},
srcerr{"\"", token.STRING, "string not terminated"},
srcerr{"/**/", token.COMMENT, ""},
srcerr{"/*", token.COMMENT, "comment not terminated"},
srcerr{"//\n", token.COMMENT, ""},
srcerr{"//", token.COMMENT, "comment not terminated"},
srcerr{"077", token.INT, ""},
srcerr{"078.", token.FLOAT, ""},
srcerr{"07801234567.", token.FLOAT, ""},
srcerr{"078e0", token.FLOAT, ""},
srcerr{"078", token.INT, "illegal octal number"},
srcerr{"07800000009", token.INT, "illegal octal number"},
srcerr{"\"\"", token.STRING, 0, ""},
srcerr{"\"", token.STRING, 0, "string not terminated"},
srcerr{"/**/", token.COMMENT, 0, ""},
srcerr{"/*", token.COMMENT, 0, "comment not terminated"},
srcerr{"//\n", token.COMMENT, 0, ""},
srcerr{"//", token.COMMENT, 0, "comment not terminated"},
srcerr{"077", token.INT, 0, ""},
srcerr{"078.", token.FLOAT, 0, ""},
srcerr{"07801234567.", token.FLOAT, 0, ""},
srcerr{"078e0", token.FLOAT, 0, ""},
srcerr{"078", token.INT, 0, "illegal octal number"},
srcerr{"07800000009", token.INT, 0, "illegal octal number"},
srcerr{"\"abc\x00def\"", token.STRING, 4, "illegal character NUL"},
srcerr{"\"abc\x80def\"", token.STRING, 4, "illegal UTF-8 encoding"},
}
func TestScanErrors(t *testing.T) {
for _, e := range errors {
checkError(t, e.src, e.tok, e.err)
checkError(t, e.src, e.tok, e.pos, e.err)
}
}