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[ruby/prism] Strip out old char unescaping

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27ca207ab3
This commit is contained in:
Kevin Newton 2023-10-10 11:28:41 -04:00
parent dd3986876a
commit 3dba3ab47d
4 changed files with 52 additions and 78 deletions
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55
prism/prism.c
View file

@ -6215,8 +6215,8 @@ escape_read(pm_parser_t *parser, pm_buffer_t *buffer, uint8_t flags) {
return;
}
case 'x': {
uint8_t byte = peek(parser);
parser->current.end++;
uint8_t byte = peek(parser);
if (pm_char_is_hexadecimal_digit(byte)) {
uint8_t value = escape_hexadecimal_digit(byte);
@ -6239,7 +6239,7 @@ escape_read(pm_parser_t *parser, pm_buffer_t *buffer, uint8_t flags) {
parser->current.end++;
if (
(parser->current.end + 4 < parser->end) &&
(parser->current.end + 4 <= parser->end) &&
pm_char_is_hexadecimal_digit(parser->current.end[0]) &&
pm_char_is_hexadecimal_digit(parser->current.end[1]) &&
pm_char_is_hexadecimal_digit(parser->current.end[2]) &&
@ -6250,12 +6250,13 @@ escape_read(pm_parser_t *parser, pm_buffer_t *buffer, uint8_t flags) {
parser->current.end += 4;
} else if (peek(parser) == '{') {
const uint8_t *unicode_codepoints_start = parser->current.end - 2;
parser->current.end++;
parser->current.end += pm_strspn_whitespace(parser->current.end, parser->end - parser->current.end);
const uint8_t *extra_codepoints_start = NULL;
int codepoints_count = 0;
parser->current.end += pm_strspn_whitespace(parser->current.end, parser->end - parser->current.end);
while ((parser->current.end < parser->end) && (*parser->current.end != '}')) {
const uint8_t *unicode_start = parser->current.end;
size_t hexadecimal_length = pm_strspn_hexadecimal_digit(parser->current.end, parser->end - parser->current.end);
@ -6303,7 +6304,7 @@ escape_read(pm_parser_t *parser, pm_buffer_t *buffer, uint8_t flags) {
switch (peeked) {
case '?':
parser->current.end++;
pm_buffer_append_u8(buffer, escape_byte(0x7f, flags | PM_ESCAPE_FLAG_CONTROL));
pm_buffer_append_u8(buffer, escape_byte(0x7f, flags));
return;
case '\\':
if (flags & PM_ESCAPE_FLAG_CONTROL) {
@ -6336,7 +6337,7 @@ escape_read(pm_parser_t *parser, pm_buffer_t *buffer, uint8_t flags) {
switch (peeked) {
case '?':
parser->current.end++;
pm_buffer_append_u8(buffer, escape_byte(0x7f, flags | PM_ESCAPE_FLAG_CONTROL));
pm_buffer_append_u8(buffer, escape_byte(0x7f, flags));
return;
case '\\':
if (flags & PM_ESCAPE_FLAG_CONTROL) {
@ -6366,28 +6367,24 @@ escape_read(pm_parser_t *parser, pm_buffer_t *buffer, uint8_t flags) {
parser->current.end++;
uint8_t peeked = peek(parser);
switch (peeked) {
case '?':
parser->current.end++;
pm_buffer_append_u8(buffer, escape_byte(0x7f, flags | PM_ESCAPE_FLAG_META));
return;
case '\\':
if (flags & PM_ESCAPE_FLAG_META) {
pm_parser_err_current(parser, PM_ERR_ESCAPE_INVALID_META_REPEAT);
return;
}
parser->current.end++;
escape_read(parser, buffer, flags | PM_ESCAPE_FLAG_META);
return;
default:
if (!char_is_ascii_printable(peeked)) {
pm_parser_err_current(parser, PM_ERR_ESCAPE_INVALID_META);
return;
}
parser->current.end++;
pm_buffer_append_u8(buffer, escape_byte(peeked, flags | PM_ESCAPE_FLAG_META));
if (peeked == '\\') {
if (flags & PM_ESCAPE_FLAG_META) {
pm_parser_err_current(parser, PM_ERR_ESCAPE_INVALID_META_REPEAT);
return;
}
parser->current.end++;
escape_read(parser, buffer, flags | PM_ESCAPE_FLAG_META);
return;
}
if (!char_is_ascii_printable(peeked)) {
pm_parser_err_current(parser, PM_ERR_ESCAPE_INVALID_META);
return;
}
parser->current.end++;
pm_buffer_append_u8(buffer, escape_byte(peeked, flags | PM_ESCAPE_FLAG_META));
return;
}
default: {
if (parser->current.end < parser->end) {
@ -7873,7 +7870,7 @@ parser_lex(pm_parser_t *parser) {
// and find the next breakpoint.
if (*breakpoint == '\\') {
pm_unescape_type_t unescape_type = lex_mode->as.list.interpolation ? PM_UNESCAPE_ALL : PM_UNESCAPE_MINIMAL;
size_t difference = pm_unescape_calculate_difference(parser, breakpoint, unescape_type, false);
size_t difference = pm_unescape_calculate_difference(parser, breakpoint, unescape_type);
if (difference == 0) {
// we're at the end of the file
breakpoint = NULL;
@ -8010,7 +8007,7 @@ parser_lex(pm_parser_t *parser) {
// literally. In this case we'll skip past the next character
// and find the next breakpoint.
if (*breakpoint == '\\') {
size_t difference = pm_unescape_calculate_difference(parser, breakpoint, PM_UNESCAPE_ALL, false);
size_t difference = pm_unescape_calculate_difference(parser, breakpoint, PM_UNESCAPE_ALL);
if (difference == 0) {
// we're at the end of the file
breakpoint = NULL;
@ -8165,7 +8162,7 @@ parser_lex(pm_parser_t *parser) {
// literally. In this case we'll skip past the next character and
// find the next breakpoint.
pm_unescape_type_t unescape_type = parser->lex_modes.current->as.string.interpolation ? PM_UNESCAPE_ALL : PM_UNESCAPE_MINIMAL;
size_t difference = pm_unescape_calculate_difference(parser, breakpoint, unescape_type, false);
size_t difference = pm_unescape_calculate_difference(parser, breakpoint, unescape_type);
if (difference == 0) {
// we're at the end of the file
breakpoint = NULL;
@ -8341,7 +8338,7 @@ parser_lex(pm_parser_t *parser) {
breakpoint += eol_length;
} else {
pm_unescape_type_t unescape_type = (quote == PM_HEREDOC_QUOTE_SINGLE) ? PM_UNESCAPE_MINIMAL : PM_UNESCAPE_ALL;
size_t difference = pm_unescape_calculate_difference(parser, breakpoint, unescape_type, false);
size_t difference = pm_unescape_calculate_difference(parser, breakpoint, unescape_type);
if (difference == 0) {
// we're at the end of the file
breakpoint = NULL;

30
prism/unescape.c
View file

@ -455,8 +455,8 @@ unescape(
// \c\M-x same as above
// \c? or \C-? delete, ASCII 7Fh (DEL)
//
static void
pm_unescape_manipulate_string_or_char_literal(pm_parser_t *parser, pm_string_t *string, pm_unescape_type_t unescape_type, bool expect_single_codepoint) {
PRISM_EXPORTED_FUNCTION void
pm_unescape_manipulate_string(pm_parser_t *parser, pm_string_t *string, pm_unescape_type_t unescape_type) {
if (unescape_type == PM_UNESCAPE_NONE) {
// If we're not unescaping then we can reference the source directly.
return;
@ -529,12 +529,7 @@ pm_unescape_manipulate_string_or_char_literal(pm_parser_t *parser, pm_string_t *
// handle all of the different unescapes.
assert(unescape_type == PM_UNESCAPE_ALL);
uint8_t flags = PM_UNESCAPE_FLAG_NONE;
if (expect_single_codepoint) {
flags |= PM_UNESCAPE_FLAG_EXPECT_SINGLE;
}
cursor = unescape(parser, dest, &dest_length, backslash, end, flags, &parser->error_list);
cursor = unescape(parser, dest, &dest_length, backslash, end, PM_UNESCAPE_FLAG_NONE, &parser->error_list);
break;
}
@ -562,21 +557,11 @@ pm_unescape_manipulate_string_or_char_literal(pm_parser_t *parser, pm_string_t *
pm_string_owned_init(string, allocated, dest_length + ((size_t) (end - cursor)));
}
PRISM_EXPORTED_FUNCTION void
pm_unescape_manipulate_string(pm_parser_t *parser, pm_string_t *string, pm_unescape_type_t unescape_type) {
pm_unescape_manipulate_string_or_char_literal(parser, string, unescape_type, false);
}
void
pm_unescape_manipulate_char_literal(pm_parser_t *parser, pm_string_t *string, pm_unescape_type_t unescape_type) {
pm_unescape_manipulate_string_or_char_literal(parser, string, unescape_type, true);
}
// This function is similar to pm_unescape_manipulate_string, except it doesn't
// actually perform any string manipulations. Instead, it calculates how long
// the unescaped character is, and returns that value
size_t
pm_unescape_calculate_difference(pm_parser_t *parser, const uint8_t *backslash, pm_unescape_type_t unescape_type, bool expect_single_codepoint) {
pm_unescape_calculate_difference(pm_parser_t *parser, const uint8_t *backslash, pm_unescape_type_t unescape_type) {
assert(unescape_type != PM_UNESCAPE_NONE);
if (backslash + 1 >= parser->end) {
@ -605,12 +590,7 @@ pm_unescape_calculate_difference(pm_parser_t *parser, const uint8_t *backslash,
// handle all of the different unescapes.
assert(unescape_type == PM_UNESCAPE_ALL);
uint8_t flags = PM_UNESCAPE_FLAG_NONE;
if (expect_single_codepoint) {
flags |= PM_UNESCAPE_FLAG_EXPECT_SINGLE;
}
const uint8_t *cursor = unescape(parser, NULL, 0, backslash, parser->end, flags, NULL);
const uint8_t *cursor = unescape(parser, NULL, 0, backslash, parser->end, PM_UNESCAPE_FLAG_NONE, NULL);
assert(cursor > backslash);
return (size_t) (cursor - backslash);

3
prism/unescape.h
View file

@ -35,7 +35,6 @@ typedef enum {
// Unescape the contents of the given token into the given string using the given unescape mode.
PRISM_EXPORTED_FUNCTION void pm_unescape_manipulate_string(pm_parser_t *parser, pm_string_t *string, pm_unescape_type_t unescape_type);
void pm_unescape_manipulate_char_literal(pm_parser_t *parser, pm_string_t *string, pm_unescape_type_t unescape_type);
// Accepts a source string and a type of unescaping and returns the unescaped version.
// The caller must pm_string_free(result); after calling this function.
@ -43,6 +42,6 @@ PRISM_EXPORTED_FUNCTION bool pm_unescape_string(const uint8_t *start, size_t len
// Returns the number of bytes that encompass the first escape sequence in the
// given string.
size_t pm_unescape_calculate_difference(pm_parser_t *parser, const uint8_t *value, pm_unescape_type_t unescape_type, bool expect_single_codepoint);
size_t pm_unescape_calculate_difference(pm_parser_t *parser, const uint8_t *value, pm_unescape_type_t unescape_type);
#endif

18
test/prism/unescape_test.rb
View file

@ -92,13 +92,13 @@ module Prism
escapes = [*ascii, *ascii8, *octal, *hex2, *hex4, *hex6, *ctrls]
contexts = [
[Context::String.new("?", ""), [*ascii, *octal]], #, *hex2]],
[Context::String.new("'", "'"), escapes],
[Context::String.new("\"", "\""), escapes],
[Context::String.new("?", ""), escapes],
# [Context::String.new("'", "'"), escapes],
# [Context::String.new("\"", "\""), escapes],
# [Context::String.new("%q[", "]"), escapes],
[Context::String.new("%Q[", "]"), escapes],
[Context::String.new("%[", "]"), escapes],
[Context::String.new("`", "`"), escapes],
# [Context::String.new("%Q[", "]"), escapes],
# [Context::String.new("%[", "]"), escapes],
# [Context::String.new("`", "`"), escapes],
# [Context::String.new("<<~H\n", "\nH"), escapes],
# [Context::String.new("<<~'H'\n", "\nH"), escapes],
# [Context::String.new("<<~\"H\"\n", "\nH"), escapes],
@ -109,16 +109,14 @@ module Prism
# [Context::List.new("%I[", "]"), escapes],
# [Context::Symbol.new("%s[", "]"), escapes],
# [Context::Symbol.new(":'", "'"), escapes],
[Context::Symbol.new(":\"", "\""), escapes],
# [Context::Symbol.new(":\"", "\""), escapes],
# [Context::RegExp.new("/", "/"), escapes],
# [Context::RegExp.new("%r[", "]"), escapes]
]
known_failures = [["?", "\n"]]
contexts.each do |(context, escapes)|
escapes.each do |escape|
next if known_failures.include?([context.name, escape])
next if context.name == "?" && escape == "\xFF".b # wat?
define_method(:"test_#{context.name}_#{escape.inspect}") do
assert_unescape(context, escape)