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Another infinite loop grammar detection. Fix #133
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4
peglib.h
4
peglib.h
@ -2872,7 +2872,9 @@ private:
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};
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};
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g["Sequence"] = [&](const SemanticValues &vs) {
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g["Sequence"] = [&](const SemanticValues &vs) {
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if (vs.size() == 1) {
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if (vs.empty()) {
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return npd(dot());
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} else if (vs.size() == 1) {
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return std::any_cast<std::shared_ptr<Ope>>(vs[0]);
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return std::any_cast<std::shared_ptr<Ope>>(vs[0]);
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} else {
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} else {
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std::vector<std::shared_ptr<Ope>> opes;
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std::vector<std::shared_ptr<Ope>> opes;
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@ -159,6 +159,14 @@ TEST_CASE("Infinite loop 7", "[infinite loop]") {
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REQUIRE(!pg);
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REQUIRE(!pg);
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}
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}
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TEST_CASE("Infinite loop 8", "[infinite loop]") {
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parser pg(R"(
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ROOT <- ('A' /)*
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)");
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REQUIRE(!pg);
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}
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TEST_CASE("Not infinite 1", "[infinite loop]") {
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TEST_CASE("Not infinite 1", "[infinite loop]") {
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parser pg(R"(
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parser pg(R"(
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Numbers <- Number* EOF
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Numbers <- Number* EOF
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@ -42,6 +42,11 @@ TEST_CASE("PEG Expression", "[peg]")
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REQUIRE(exact(g, "Expression", "") == true);
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REQUIRE(exact(g, "Expression", "") == true);
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REQUIRE(exact(g, "Expression", " ") == false);
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REQUIRE(exact(g, "Expression", " ") == false);
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REQUIRE(exact(g, "Expression", " a b ") == false);
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REQUIRE(exact(g, "Expression", " a b ") == false);
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// NOTE: The followings are actually allowed in the original Ford's paper...
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REQUIRE(exact(g, "Expression", "a//b ") == true);
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REQUIRE(exact(g, "Expression", "a // b ") == true);
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REQUIRE(exact(g, "Expression", "a / / b ") == true);
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}
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}
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TEST_CASE("PEG Sequence", "[peg]")
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TEST_CASE("PEG Sequence", "[peg]")
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