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parse.y: warn escaped whitespace

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* parse.y (warn_space_char_code): warn whitespace characters
  escaped with meta/control prefix.
This commit is contained in:
Nobuyoshi Nakada 2019-05-28 21:39:13 +09:00
parent fb568fe724
commit c730c25354
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GPG key ID: 4BC7D6DF58D8DF60
3 changed files with 91 additions and 22 deletions
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86
parse.y
View file

@ -6138,6 +6138,36 @@ tok_hex(struct parser_params *p, size_t *numlen)
#define tokcopy(p, n) memcpy(tokspace(p, n), (p)->lex.pcur - (n), (n))
static int
escaped_control_code(int c)
{
int c2 = 0;
switch (c) {
case ' ':
c2 = 's';
break;
case '\n':
c2 = 'n';
break;
case '\t':
c2 = 't';
break;
case '\v':
c2 = 'v';
break;
case '\r':
c2 = 'r';
break;
case '\f':
c2 = 'f';
break;
}
return c2;
}
#define WARN_SPACE_CHAR(c, prefix) \
rb_warn1("invalid character syntax; use "prefix"\\%c", WARN_I(c2))
static int
tokadd_codepoint(struct parser_params *p, rb_encoding **encp,
int regexp_literal, int wide)
@ -6290,6 +6320,16 @@ read_escape(struct parser_params *p, int flags, rb_encoding **encp)
}
else if (c == -1 || !ISASCII(c)) goto eof;
else {
int c2 = escaped_control_code(c);
if (c2) {
if (ISCNTRL(c) || !(flags & ESCAPE_CONTROL)) {
WARN_SPACE_CHAR(c2, "\\M-");
}
else {
WARN_SPACE_CHAR(c2, "\\C-\\M-");
}
}
else if (ISCNTRL(c)) goto eof;
return ((c & 0xff) | 0x80);
}
@ -6306,6 +6346,28 @@ read_escape(struct parser_params *p, int flags, rb_encoding **encp)
else if (c == '?')
return 0177;
else if (c == -1 || !ISASCII(c)) goto eof;
else {
int c2 = escaped_control_code(c);
if (c2) {
if (ISCNTRL(c)) {
if (flags & ESCAPE_META) {
WARN_SPACE_CHAR(c2, "\\M-");
}
else {
WARN_SPACE_CHAR(c2, "");
}
}
else {
if (flags & ESCAPE_META) {
WARN_SPACE_CHAR(c2, "\\M-\\C-");
}
else {
WARN_SPACE_CHAR(c2, "\\C-");
}
}
}
else if (ISCNTRL(c)) goto eof;
}
return c & 0x9f;
eof:
@ -8009,29 +8071,9 @@ parse_qmark(struct parser_params *p, int space_seen)
}
if (rb_enc_isspace(c, p->enc)) {
if (!IS_ARG()) {
int c2 = 0;
switch (c) {
case ' ':
c2 = 's';
break;
case '\n':
c2 = 'n';
break;
case '\t':
c2 = 't';
break;
case '\v':
c2 = 'v';
break;
case '\r':
c2 = 'r';
break;
case '\f':
c2 = 'f';
break;
}
int c2 = escaped_control_code(c);
if (c2) {
rb_warn1("invalid character syntax; use ?\\%c", WARN_I(c2));
WARN_SPACE_CHAR(c2, "?");
}
}
ternary:

1
test/ruby/test_literal.rb
View file

@ -45,6 +45,7 @@ class TestRubyLiteral < Test::Unit::TestCase
assert_equal "A", ?A
assert_instance_of String, ?\n
assert_equal "\n", ?\n
assert_equal " ", ?\s
assert_equal " ", ?\ # space
assert_equal '', ''
assert_equal 'string', 'string'

26
test/ruby/test_parse.rb
View file

@ -548,6 +548,19 @@ class TestParse < Test::Unit::TestCase
assert_equal("\x81", eval('"\C-\M-a"'))
assert_equal("\177", eval('"\c?"'))
assert_warning(/use \\C-\\s/) {assert_equal("\x00", eval('"\C- "'))}
assert_warning(/use \\M-\\s/) {assert_equal("\xa0", eval('"\M- "'))}
assert_warning(/use \\M-\\C-\\s/) {assert_equal("\x80", eval('"\M-\C- "'))}
assert_warning(/use \\C-\\M-\\s/) {assert_equal("\x80", eval('"\C-\M- "'))}
assert_warning(/use \\t/) {assert_equal("\x09", eval("\"\\C-\t\""))}
assert_warning(/use \\M-\\t/) {assert_equal("\x89", eval("\"\\M-\t\""))}
assert_warning(/use \\M-\\t/) {assert_equal("\x89", eval("\"\\M-\\C-\t\""))}
assert_warning(/use \\M-\\t/) {assert_equal("\x89", eval("\"\\C-\\M-\t\""))}
assert_syntax_error("\"\\C-\x01\"", 'Invalid escape character syntax')
assert_syntax_error("\"\\M-\x01\"", 'Invalid escape character syntax')
assert_syntax_error("\"\\M-\\C-\x01\"", 'Invalid escape character syntax')
assert_syntax_error("\"\\C-\\M-\x01\"", 'Invalid escape character syntax')
end
def test_question
@ -565,6 +578,19 @@ class TestParse < Test::Unit::TestCase
assert_equal("\u{1234}", eval('?\u1234'))
e = assert_syntax_error('"#{?\u123}"', 'invalid Unicode escape')
assert_not_match(/end-of-input/, e.message)
assert_warning(/use ?\\C-\\s/) {assert_equal("\x00", eval('?\C- '))}
assert_warning(/use ?\\M-\\s/) {assert_equal("\xa0", eval('?\M- '))}
assert_warning(/use ?\\M-\\C-\\s/) {assert_equal("\x80", eval('?\M-\C- '))}
assert_warning(/use ?\\C-\\M-\\s/) {assert_equal("\x80", eval('?\C-\M- '))}
assert_warning(/use ?\\t/) {assert_equal("\x09", eval("?\\C-\t"))}
assert_warning(/use ?\\M-\\t/) {assert_equal("\x89", eval("?\\M-\t"))}
assert_warning(/use ?\\M-\\t/) {assert_equal("\x89", eval("?\\M-\\C-\t"))}
assert_warning(/use ?\\M-\\t/) {assert_equal("\x89", eval("?\\C-\\M-\t"))}
assert_syntax_error("?\\C-\x01", 'Invalid escape character syntax')
assert_syntax_error("?\\M-\x01", 'Invalid escape character syntax')
assert_syntax_error("?\\M-\\C-\x01", 'Invalid escape character syntax')
assert_syntax_error("?\\C-\\M-\x01", 'Invalid escape character syntax')
end
def test_percent