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Fix #205

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This commit is contained in:
yhirose 2022-05-26 21:37:08 -04:00
parent 7ee4fccb95
commit 3c745bf581
3 changed files with 47 additions and 14 deletions
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docs/native.wasm
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40
peglib.h
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@ -3810,18 +3810,9 @@ private:
if (!ret) { return nullptr; }
// Check infinite loop
{
DetectInfiniteLoop vis(data.start_pos, data.start);
start_rule.accept(vis);
if (vis.has_error) {
if (log) {
auto line = line_info(s, vis.error_s);
log(line.first, line.second,
"infinite loop is detected in '" + vis.error_name + "'.");
}
if (detect_infiniteLoop(data, start_rule, log, s)) {
return nullptr;
}
}
// Automatic whitespace skipping
if (grammar.count(WHITESPACE_DEFINITION_NAME)) {
@ -3831,13 +3822,22 @@ private:
if (IsLiteralToken::check(*ope)) { rule <= tok(ope); }
}
start_rule.whitespaceOpe =
wsp(grammar[WHITESPACE_DEFINITION_NAME].get_core_operator());
auto &rule = grammar[WHITESPACE_DEFINITION_NAME];
start_rule.whitespaceOpe = wsp(rule.get_core_operator());
if (detect_infiniteLoop(data, rule, log, s)) {
return nullptr;
}
}
// Word expression
if (grammar.count(WORD_DEFINITION_NAME)) {
start_rule.wordOpe = grammar[WORD_DEFINITION_NAME].get_core_operator();
auto &rule = grammar[WORD_DEFINITION_NAME];
start_rule.wordOpe = rule.get_core_operator();
if (detect_infiniteLoop(data, rule, log, s)) {
return nullptr;
}
}
// Apply instructions
@ -3867,6 +3867,20 @@ private:
return data.grammar;
}
bool detect_infiniteLoop(const Data &data, Definition &rule, const Log &log, const char *s) const {
DetectInfiniteLoop vis(data.start_pos, rule.name);
rule.accept(vis);
if (vis.has_error) {
if (log) {
auto line = line_info(s, vis.error_s);
log(line.first, line.second,
"infinite loop is detected in '" + vis.error_name + "'.");
}
return true;
}
return false;
}
Grammar g;
};

19
test/test2.cc
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@ -204,6 +204,25 @@ TEST(InfiniteLoopTest, Not_infinite_3) {
EXPECT_TRUE(!!pg);
}
TEST(InfiniteLoopTest, whitespace) {
parser pg(R"(
S <- 'hello'
%whitespace <- ('')*
)");
EXPECT_FALSE(pg);
}
TEST(InfiniteLoopTest, word) {
parser pg(R"(
S <- 'hello'
%whitespace <- ' '*
%word <- ('')*
)");
EXPECT_FALSE(pg);
}
TEST(PrecedenceTest, Precedence_climbing) {
parser parser(R"(
START <- _ EXPRESSION