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Handle an invalid escape sequence char

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This commit is contained in:
yhirose 2020-01-26 23:00:37 -05:00
parent 35d2d201e1
commit 3dc0205ffa
2 changed files with 30 additions and 4 deletions
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3
peglib.h
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@ -383,6 +383,9 @@ inline std::string resolve_escape_sequence(const char* s, size_t n) {
auto ch = s[i]; auto ch = s[i];
if (ch == '\\') { if (ch == '\\') {
i++; i++;
if (i == n) {
throw std::runtime_error("Invalid escape sequence...");
}
switch (s[i]) { switch (s[i]) {
case 'n': r += '\n'; i++; break; case 'n': r += '\n'; i++; break;
case 'r': r += '\r'; i++; break; case 'r': r += '\r'; i++; break;

31
test/test.cc
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@ -20,10 +20,10 @@ TEST_CASE("Simple syntax test (with unicode)", "[general]")
TEST_CASE("Simple syntax test", "[general]") TEST_CASE("Simple syntax test", "[general]")
{ {
peg::parser parser( peg::parser parser(R"(
" ROOT <- _ " ROOT <- _
" _ <- ' ' " _ <- ' '
); )");
bool ret = parser; bool ret = parser;
REQUIRE(ret == true); REQUIRE(ret == true);
@ -36,6 +36,28 @@ TEST_CASE("Empty syntax test", "[general]")
REQUIRE(ret == false); REQUIRE(ret == false);
} }
TEST_CASE("Backslash escape sequence test", "[general]")
{
peg::parser parser(R"(
ROOT <- _
_ <- '\\'
)");
bool ret = parser;
REQUIRE(ret == true);
}
TEST_CASE("Invalid escape sequence test", "[general]")
{
peg::parser parser(R"(
ROOT <- _
_ <- '\'
)");
bool ret = parser;
REQUIRE(ret == false);
}
TEST_CASE("Infinite loop 1", "[infinite loop]") TEST_CASE("Infinite loop 1", "[infinite loop]")
{ {
peg::parser pg(R"( peg::parser pg(R"(
@ -1727,6 +1749,7 @@ TEST_CASE("PEG Literal", "[peg]")
REQUIRE(exact(g, "Literal", "\"'\"abc\"'\" ") == false); REQUIRE(exact(g, "Literal", "\"'\"abc\"'\" ") == false);
REQUIRE(exact(g, "Literal", "abc") == false); REQUIRE(exact(g, "Literal", "abc") == false);
REQUIRE(exact(g, "Literal", "") == false); REQUIRE(exact(g, "Literal", "") == false);
REQUIRE(exact(g, "Literal", "\\") == false);
REQUIRE(exact(g, "Literal", u8"'日本語'") == true); REQUIRE(exact(g, "Literal", u8"'日本語'") == true);
REQUIRE(exact(g, "Literal", u8"\"日本語\"") == true); REQUIRE(exact(g, "Literal", u8"\"日本語\"") == true);
REQUIRE(exact(g, "Literal", u8"日本語") == false); REQUIRE(exact(g, "Literal", u8"日本語") == false);