71 lines
1.7 KiB
C++
71 lines
1.7 KiB
C++
/** @file tokenrepl.cpp **/
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#include "xo/tokenizer/tokenizer.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,
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std::istream & in,
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std::ostream & out,
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std::string & input)
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{
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if (interactive) {
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out << "> ";
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std::flush(out);
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}
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return static_cast<bool>(std::getline(in, input));
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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 tokenizer_type = tokenizer<char>;
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using span_type = tokenizer_type::span_type;
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xo::log_config::min_log_level = xo::log_level::severe;
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bool interactive = isatty(STDIN_FILENO);
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tokenizer_type tkz(xo::log_config::min_log_level <= xo::log_level::info);
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string input_str;
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size_t line_no = 1;
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constexpr std::size_t c_maxlines = 25;
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while (repl_getline(interactive, cin, cout, input_str)) {
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// we want tokenizer to see newline, it's syntax
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input_str.push_back('\n');
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span_type input = span_type::from_string(input_str);
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// reminder: input may contain multiple tokens
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while (!input.empty()) {
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auto [tk, consumed, error] = tkz.scan(input, false /*!eof*/);
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if (tk.is_valid()) {
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cout << tk << endl;
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} else if (error.is_error()) {
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cout << "tokenizer error: " << endl;
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error.report(cout);
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break;
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}
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input = input.after_prefix(consumed);
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}
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/* here: input.empty() or error encountered */
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++line_no;
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if (line_no > c_maxlines) {
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cout << "always exit after " << c_maxlines << " lines of input" << endl;
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break;
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}
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}
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}
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/** end tokenrepl.cpp */
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