143 lines
3.7 KiB
C++
143 lines
3.7 KiB
C++
/** @file exprreplxx.cpp **/
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#include "xo/reader/reader.hpp"
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#include <replxx.hxx>
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#include <iostream>
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#include <unistd.h> // for isatty
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// presumeably replxx assumes input is a tty
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//
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bool replxx_getline(bool interactive,
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std::size_t parser_stack_size,
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replxx::Replxx & rx,
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std::string& input)
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{
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using namespace std;
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char const * prompt = "";
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if (interactive) {
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if (parser_stack_size <= 1)
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prompt = "> ";
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else
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prompt = ". ";
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}
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const char * input_cstr = rx.input(prompt);
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bool retval = (input_cstr != nullptr);
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if (retval) {
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//cerr << "got reval->true" << endl;
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input = input_cstr;
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} else {
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//cerr << "got retval->false" << endl;
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}
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rx.history_add(input);
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input.push_back('\n');
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return retval;
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}
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void
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welcome(std::ostream& os)
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{
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using namespace std;
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os << "read-eval-print loop for schematika expressions" << endl;
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os << " ctrl-a/ctrl-e beginning/end of line" << endl;
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os << " ctrl-u delete entire line" << endl;
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os << " ctrl-k delete to end of line" << endl;
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os << " meta-<bs> backward delete word" << endl;
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os << " <up>|meta-p previous command from history" << endl;
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os << " <down>|meta-n next command from history" << endl;
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os << " <pgup>/<pgdown> page through history faster" << endl;
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os << " ctrl-s/ctrl-r forward/backward history search" << endl;
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os << endl;
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}
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int
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main()
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{
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using namespace replxx;
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using namespace xo::scm;
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using xo::scm::Expression;
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using xo::print::ppconfig;
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using xo::print::ppstate_standalone;
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using xo::rp;
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using namespace std;
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using span_type = xo::scm::span<const char>;
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bool interactive = isatty(STDIN_FILENO);
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Replxx rx;
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rx.set_max_history_size(1000);
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rx.history_load("repl_history.txt");
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// rx.bind_key_internal(Replxx::KEY::control('p'), "history_previous");
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// rx.bind_key_internal(Replxx::KEY::control('n'), "history_next");
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constexpr bool c_debug_flag = false;
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rp<GlobalSymtab> toplevel_symtab = GlobalSymtab::make_empty();
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reader rdr(toplevel_symtab, c_debug_flag);
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rdr.begin_interactive_session();
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string input_str;
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bool eof = false;
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span_type input;
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std::size_t parser_stack_size = 0;
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welcome(cerr);
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while (replxx_getline(interactive, parser_stack_size, rx, input_str)) {
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input = span_type::from_string(input_str);
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while (!input.empty()) {
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auto [expr, consumed, psz, error] = rdr.read_expr(input, eof);
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if (expr) {
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ppconfig ppc;
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ppstate_standalone pps(&cout, 0, &ppc);
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pps.prettyn(expr);
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} else if (error.is_error()) {
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cout << "parsing error (detected in " << error.src_function() << "): " << endl;
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error.report(cout);
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/* discard stashed remainder of input line
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* (for nicely-formatted errors)
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*/
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rdr.reset_to_idle_toplevel();
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break;
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}
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input = input.after_prefix(consumed);
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parser_stack_size = psz;
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}
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/* here: input.empty() or error encountered */
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}
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auto [expr, _1, _2, error] = rdr.read_expr(input, true /*eof*/);
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if (expr) {
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ppconfig ppc;
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ppstate_standalone pps(&cout, 0, &ppc);
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pps.prettyn<rp<Expression>>(rp<Expression>(expr));
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} else if (error.is_error()) {
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cout << "parsing error (detected in " << error.src_function() << "): " << endl;
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error.report(cout);
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}
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rx.history_save("repl_history.txt");
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}
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