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39 lines
888 B
39 lines
888 B
//
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// enter_leave.cc
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//
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// Copyright (c) 2023 Yuji Hirose. All rights reserved.
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// MIT License
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//
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#include <cstdlib>
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#include <iostream>
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#include <peglib.h>
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using namespace peg;
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int main(void) {
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parser parser(R"(
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S <- A+
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A <- 'A'
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)");
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parser["A"].enter = [](const Context & /*c*/, const char * /*s*/,
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size_t /*n*/, std::any & /*dt*/) {
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std::cout << "enter" << std::endl;
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};
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parser["A"] = [](const SemanticValues & /*vs*/, std::any & /*dt*/) {
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std::cout << "action!" << std::endl;
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};
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parser["A"].leave = [](const Context & /*c*/, const char * /*s*/,
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size_t /*n*/, size_t /*matchlen*/,
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std::any & /*value*/, std::any & /*dt*/) {
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std::cout << "leave" << std::endl;
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};
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if (parser.parse("A")) { return 0; }
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std::cout << "syntax error..." << std::endl;
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return -1;
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}
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