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Completely rewrite QUtil::parse_numrange

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This commit is contained in:
Jay Berkenbilt 2024-01-01 09:51:05 -05:00
parent d9b8b0aae1
commit 708ea4ef43
2 changed files with 95 additions and 131 deletions
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196
libqpdf/QUtil.cc
View File

@ -9,15 +9,12 @@
#include <qpdf/QPDFSystemError.hh>
#include <qpdf/QTC.hh>
#include <cctype>
#include <cerrno>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <fcntl.h>
#include <fstream>
#include <iomanip>
#include <locale>
#include <map>
#include <memory>
#include <regex>
@ -1303,93 +1300,52 @@ QUtil::str_compare_nocase(char const* s1, char const* s2)
#endif
}
static int
maybe_from_end(int num, bool from_end, int max)
{
if (from_end) {
if (num > max) {
num = 0;
} else {
num = max + 1 - num;
}
}
return num;
}
std::vector<int>
QUtil::parse_numrange(char const* range, int max)
{
std::vector<int> result;
char const* p = range;
static std::regex group_re(R"((x)?(z|r?\d+)(?:-(z|r?\d+))?)");
auto parse_num = [&max](std::string const& s) -> int {
if (s == "z") {
return max;
}
int num;
if (s.at(0) == 'r') {
num = max + 1 - string_to_int(s.substr(1).c_str());
} else {
num = string_to_int(s.c_str());
}
// max == 0 means we don't know the max and are just testing for valid syntax.
if ((max > 0) && ((num < 1) || (num > max))) {
throw std::runtime_error("number " + std::to_string(num) + " out of range");
}
return num;
};
auto populate = [](std::vector<int>& group, int first_num, bool is_span, int last_num) {
group.clear();
group.emplace_back(first_num);
if (is_span) {
if (first_num > last_num) {
for (auto i = first_num - 1; i >= last_num; --i) {
group.push_back(i);
}
} else {
for (auto i = first_num + 1; i <= last_num; ++i) {
group.push_back(i);
}
}
}
};
char const* p;
try {
std::vector<int> work;
static int const comma = -1;
static int const dash = -2;
char const* range_end = range + strlen(range);
std::vector<int> result;
std::vector<int> last_group;
// See if range ends with :even or :odd.
size_t start_idx = 0;
size_t skip = 1;
enum { st_top, st_in_number, st_after_number } state = st_top;
bool last_separator_was_dash = false;
int cur_number = 0;
bool from_end = false;
while (*p) {
char ch = *p;
if (isdigit(ch)) {
if (!((state == st_top) || (state == st_in_number))) {
throw std::runtime_error("digit not expected");
}
state = st_in_number;
cur_number *= 10;
cur_number += (ch - '0');
} else if (ch == 'z') {
// z represents max
if (!(state == st_top)) {
throw std::runtime_error("z not expected");
}
state = st_after_number;
cur_number = max;
} else if (ch == 'r') {
if (!(state == st_top)) {
throw std::runtime_error("r not expected");
}
state = st_in_number;
from_end = true;
} else if ((ch == ',') || (ch == '-')) {
if (!((state == st_in_number) || (state == st_after_number))) {
throw std::runtime_error("unexpected separator");
}
cur_number = maybe_from_end(cur_number, from_end, max);
work.push_back(cur_number);
cur_number = 0;
from_end = false;
if (ch == ',') {
state = st_top;
last_separator_was_dash = false;
work.push_back(comma);
} else if (ch == '-') {
if (last_separator_was_dash) {
throw std::runtime_error("unexpected dash");
}
state = st_top;
last_separator_was_dash = true;
work.push_back(dash);
}
} else if (ch == ':') {
if (!((state == st_in_number) || (state == st_after_number))) {
throw std::runtime_error("unexpected colon");
}
break;
} else {
throw std::runtime_error("unexpected character");
}
++p;
}
if ((state == st_in_number) || (state == st_after_number)) {
cur_number = maybe_from_end(cur_number, from_end, max);
work.push_back(cur_number);
} else {
throw std::runtime_error("number expected");
}
p = std::find(range, range_end, ':');
if (*p == ':') {
if (strcmp(p, ":odd") == 0) {
skip = 2;
@ -1397,46 +1353,55 @@ QUtil::parse_numrange(char const* range, int max)
skip = 2;
start_idx = 1;
} else {
throw std::runtime_error("unexpected even/odd modifier");
throw std::runtime_error("expected :even or :odd");
}
range_end = p;
}
p = nullptr;
for (size_t i = 0; i < work.size(); i += 2) {
int num = work.at(i);
// max == 0 means we don't know the max and are just testing for valid syntax.
if ((max > 0) && ((num < 1) || (num > max))) {
throw std::runtime_error("number " + QUtil::int_to_string(num) + " out of range");
// Divide the range into groups
p = range;
char const* group_end;
bool first = true;
while (p != range_end) {
group_end = std::find(p, range_end, ',');
std::cmatch m;
if (!std::regex_match(p, group_end, m, group_re)) {
throw std::runtime_error("invalid range syntax");
}
if (i == 0) {
result.push_back(work.at(i));
auto is_exclude = m[1].matched;
if (first && is_exclude) {
throw std::runtime_error("first range group may not be an exclusion");
}
first = false;
auto first_num = parse_num(m[2].str());
auto is_span = m[3].matched;
int last_num;
if (is_span) {
last_num = parse_num(m[3].str());
}
if (is_exclude) {
// XXX
} else {
int separator = work.at(i - 1);
if (separator == comma) {
result.push_back(num);
} else if (separator == dash) {
int lastnum = result.back();
if (num > lastnum) {
for (int j = lastnum + 1; j <= num; ++j) {
result.push_back(j);
}
} else {
for (int j = lastnum - 1; j >= num; --j) {
result.push_back(j);
}
}
} else {
throw std::logic_error("INTERNAL ERROR parsing numeric range");
result.insert(result.end(), last_group.begin(), last_group.end());
populate(last_group, first_num, is_span, last_num);
}
p = group_end;
if (*p == ',') {
++p;
if (p == range_end) {
throw std::runtime_error("trailing comma");
}
}
}
if ((start_idx > 0) || (skip != 1)) {
auto t = result;
result.clear();
for (size_t i = start_idx; i < t.size(); i += skip) {
result.push_back(t.at(i));
}
result.insert(result.end(), last_group.begin(), last_group.end());
if (skip == 1) {
return result;
}
std::vector<int> filtered;
for (auto i = start_idx; i < result.size(); i += skip) {
filtered.emplace_back(result.at(i));
}
return filtered;
} catch (std::runtime_error const& e) {
std::string message;
if (p) {
@ -1447,7 +1412,6 @@ QUtil::parse_numrange(char const* range, int max)
}
throw std::runtime_error(message);
}
return result;
}
enum encoding_e { e_utf16, e_ascii, e_winansi, e_macroman, e_pdfdoc };

30
libtests/qtest/numrange.test
View File

@ -9,37 +9,37 @@ my $td = new TestDriver('numrange');
my @nrange_tests = (
[",5",
"error at * in numeric range *,5: unexpected separator",
"error at * in numeric range *,5: invalid range syntax",
2],
["4,,5",
"error at * in numeric range 4,*,5: unexpected separator",
"error at * in numeric range 4,*,5: invalid range syntax",
2],
["4,5,",
"error at * in numeric range 4,5,*: number expected",
"error at * in numeric range 4,5,*: trailing comma",
2],
["z1,",
"error at * in numeric range z*1,: digit not expected",
"error at * in numeric range *z1,: invalid range syntax",
2],
["1z,",
"error at * in numeric range 1*z,: z not expected",
"error at * in numeric range *1z,: invalid range syntax",
2],
["1-5?",
"error at * in numeric range 1-5*?: unexpected character",
"error at * in numeric range *1-5?: invalid range syntax",
2],
["1-30",
"error in numeric range 1-30: number 30 out of range",
"error at * in numeric range *1-30: number 30 out of range",
2],
["1-10,0,5",
"error in numeric range 1-10,0,5: number 0 out of range",
"error at * in numeric range 1-10,*0,5: number 0 out of range",
2],
["1-10,1234,5",
"error in numeric range 1-10,1234,5: number 1234 out of range",
"error at * in numeric range 1-10,*1234,5: number 1234 out of range",
2],
["1,r,3",
"error in numeric range 1,r,3: number 16 out of range",
"error at * in numeric range 1,*r,3: invalid range syntax",
2],
["1,r16,3",
"error in numeric range 1,r16,3: number 0 out of range",
"error at * in numeric range 1,*r16,3: number 0 out of range",
2],
["1,3,5-10,z-13,13,9,z,2,r2-r4",
"numeric range 1,3,5-10,z-13,13,9,z,2,r2-r4" .
@ -50,16 +50,16 @@ my @nrange_tests = (
" -> 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1",
0],
["1-10:quack",
"error at * in numeric range 1-10*:quack: unexpected even/odd modifier",
"error at * in numeric range 1-10*:quack: expected :even or :odd",
2],
["1-10:",
"error at * in numeric range 1-10*:: unexpected even/odd modifier",
"error at * in numeric range 1-10*:: expected :even or :odd",
2],
["1-10,r:",
"error at * in numeric range 1-10,r*:: unexpected even/odd modifier",
"error at * in numeric range 1-10,r*:: expected :even or :odd",
2],
["1-10,:",
"error at * in numeric range 1-10,*:: unexpected colon",
"error at * in numeric range 1-10,*:: expected :even or :odd",
2],
["1-6,8-12:odd",
"numeric range 1-6,8-12:odd -> 1 3 5 8 10 12",