80 lines
1.7 KiB
C++
80 lines
1.7 KiB
C++
/** @file exprrepl.cpp **/
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#include "xo/reader/reader.hpp"
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#include <iostream>
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#include <unistd.h> // for isatty
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bool repl_getline(bool interactive, std::size_t parser_stack_size, std::istream& in, std::ostream& out, std::string& input)
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{
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using namespace std;
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if (interactive) {
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if (parser_stack_size <= 1)
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out << "> ";
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else
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out << ". ";
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std::flush(out);
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}
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bool retval = static_cast<bool>(getline(in, input));
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if (retval) {
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cerr << "got reval->true" << endl;
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// interactive only: treat ^@ (C-RET) as ;RET
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if ((input.size() > 0) && ((*input.rbegin()) == '\0'))
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{
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cerr << "got ^@" << endl;
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*input.rbegin() = ';';
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}
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// want reader to see newline, it's syntax
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input.push_back('\n');
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} else {
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cerr << "got retval->false" << endl;
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}
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return retval;
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}
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int
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main() {
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using namespace xo::scm;
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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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reader rdr;
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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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while (repl_getline(interactive, parser_stack_size, cin, cout, 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] = rdr.read_expr(input, eof);
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if (expr) {
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cout << expr << endl;
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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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}
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auto [expr, _1, _2] = rdr.read_expr(input, true /*eof*/);
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if (expr) {
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cout << expr << endl;
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}
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}
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