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/*
* Copyright (c) 2021, Tim Flynn <trflynn89@pm.me>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Format.h>
#include <AK/String.h>
#include <AK/StringBuilder.h>
#include <LibCore/StandardPaths.h>
#include <LibLine/Editor.h>
#include <LibSQL/AST/Lexer.h>
#include <LibSQL/AST/Parser.h>
#include <LibSQL/AST/Token.h>
namespace {
String s_history_path = String::formatted("{}/.sql-history", Core::StandardPaths::home_directory());
RefPtr<Line::Editor> s_editor;
int s_repl_line_level = 0;
bool s_keep_running = true;
String prompt_for_level(int level)
{
static StringBuilder prompt_builder;
prompt_builder.clear();
prompt_builder.append("> ");
for (auto i = 0; i < level; ++i)
prompt_builder.append(" ");
return prompt_builder.build();
}
String read_next_piece()
{
StringBuilder piece;
do {
if (!piece.is_empty())
piece.append('\n');
auto line_result = s_editor->get_line(prompt_for_level(s_repl_line_level));
if (line_result.is_error()) {
s_keep_running = false;
return {};
}
auto& line = line_result.value();
auto lexer = SQL::AST::Lexer(line);
s_editor->add_to_history(line);
piece.append(line);
bool is_first_token = true;
bool is_command = false;
bool last_token_ended_statement = false;
for (SQL::AST::Token token = lexer.next(); token.type() != SQL::AST::TokenType::Eof; token = lexer.next()) {
switch (token.type()) {
case SQL::AST::TokenType::ParenOpen:
++s_repl_line_level;
break;
case SQL::AST::TokenType::ParenClose:
--s_repl_line_level;
break;
case SQL::AST::TokenType::SemiColon:
last_token_ended_statement = true;
break;
case SQL::AST::TokenType::Period:
if (is_first_token)
is_command = true;
break;
default:
last_token_ended_statement = is_command;
break;
}
is_first_token = false;
}
s_repl_line_level = last_token_ended_statement ? 0 : (s_repl_line_level > 0 ? s_repl_line_level : 1);
} while (s_repl_line_level > 0);
return piece.to_string();
}
void handle_command(StringView command)
{
if (command == ".exit")
s_keep_running = false;
else
outln("\033[33;1mUnrecognized command:\033[0m {}", command);
}
void handle_statement(StringView statement_string)
{
auto parser = SQL::AST::Parser(SQL::AST::Lexer(statement_string));
[[maybe_unused]] auto statement = parser.next_statement();
if (parser.has_errors()) {
auto error = parser.errors()[0];
outln("\033[33;1mInvalid statement:\033[0m {}", error.to_string());
}
}
void repl()
{
while (s_keep_running) {
String piece = read_next_piece();
if (piece.is_empty())
continue;
if (piece.starts_with('.'))
handle_command(piece);
else
handle_statement(piece);
}
}
}
int main()
{
s_editor = Line::Editor::construct();
s_editor->load_history(s_history_path);
s_editor->on_display_refresh = [](Line::Editor& editor) {
editor.strip_styles();
size_t open_indents = s_repl_line_level;
auto line = editor.line();
SQL::AST::Lexer lexer(line);
bool indenters_starting_line = true;
for (SQL::AST::Token token = lexer.next(); token.type() != SQL::AST::TokenType::Eof; token = lexer.next()) {
auto length = token.value().length();
auto start = token.start_position().column - 1;
auto end = start + length;
if (indenters_starting_line) {
if (token.type() != SQL::AST::TokenType::ParenClose)
indenters_starting_line = false;
else
--open_indents;
}
switch (token.category()) {
case SQL::AST::TokenCategory::Invalid:
editor.stylize({ start, end }, { Line::Style::Foreground(Line::Style::XtermColor::Red), Line::Style::Underline });
break;
case SQL::AST::TokenCategory::Number:
editor.stylize({ start, end }, { Line::Style::Foreground(Line::Style::XtermColor::Magenta) });
break;
case SQL::AST::TokenCategory::String:
editor.stylize({ start, end }, { Line::Style::Foreground(Line::Style::XtermColor::Green), Line::Style::Bold });
break;
case SQL::AST::TokenCategory::Blob:
editor.stylize({ start, end }, { Line::Style::Foreground(Line::Style::XtermColor::Magenta), Line::Style::Bold });
break;
case SQL::AST::TokenCategory::Keyword:
editor.stylize({ start, end }, { Line::Style::Foreground(Line::Style::XtermColor::Blue), Line::Style::Bold });
break;
case SQL::AST::TokenCategory::Identifier:
editor.stylize({ start, end }, { Line::Style::Foreground(Line::Style::XtermColor::White), Line::Style::Bold });
default:
break;
}
}
editor.set_prompt(prompt_for_level(open_indents));
};
repl();
s_editor->save_history(s_history_path);
return 0;
}
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