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main.zig
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main.zig
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const std = @import("std");
const RocksDB = @import("rocksdb.zig").RocksDB;
const lex = @import("lex.zig");
const parse = @import("parse.zig");
const execute = @import("execute.zig");
const Storage = @import("storage.zig").Storage;
pub fn main() !void {
var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
defer arena.deinit();
const allocator = arena.allocator();
var debugTokens = false;
var debugAST = false;
var args = std.process.args();
var scriptArg: usize = 0;
var databaseArg: usize = 0;
var i: usize = 0;
while (args.next()) |arg| {
if (std.mem.eql(u8, arg, "--debug-tokens")) {
debugTokens = true;
}
if (std.mem.eql(u8, arg, "--debug-ast")) {
debugAST = true;
}
if (std.mem.eql(u8, arg, "--database")) {
databaseArg = i + 1;
i += 1;
_ = args.next();
}
if (std.mem.eql(u8, arg, "--script")) {
scriptArg = i + 1;
i += 1;
_ = args.next();
}
i += 1;
}
if (databaseArg == 0) {
std.debug.print("--database is a required flag. Should be a directory for data.\n", .{});
return;
}
if (scriptArg == 0) {
std.debug.print("--script is a required flag. Should be a file containing SQL.\n", .{});
return;
}
const file = try std.fs.cwd().openFileZ(std.os.argv[scriptArg], .{});
defer file.close();
const file_size = try file.getEndPos();
var prog = try allocator.alloc(u8, file_size);
_ = try file.read(prog);
var tokens = std.ArrayList(lex.Token).init(allocator);
const lexErr = lex.lex(prog, &tokens);
if (lexErr) |err| {
std.debug.print("Failed to lex: {s}", .{err});
return;
}
if (debugTokens) {
for (tokens.items) |token| {
std.debug.print("Token: {s}\n", .{token.string()});
}
}
if (tokens.items.len == 0) {
std.debug.print("Program is empty", .{});
return;
}
const parser = parse.Parser.init(allocator);
var ast: parse.Parser.AST = undefined;
switch (parser.parse(tokens.items)) {
.err => |err| {
std.debug.print("Failed to parse: {s}", .{err});
return;
},
.val => |val| ast = val,
}
if (debugAST) {
ast.print();
}
var db: RocksDB = undefined;
var dataDirectory = std.mem.span(std.os.argv[databaseArg]);
switch (RocksDB.open(allocator, dataDirectory)) {
.err => |err| {
std.debug.print("Failed to open database: {s}", .{err});
return;
},
.val => |val| db = val,
}
defer db.close();
const storage = Storage.init(allocator, db);
const executor = execute.Executor.init(allocator, storage);
switch (executor.execute(ast)) {
.err => |err| {
std.debug.print("Failed to execute: {s}", .{err});
return;
},
.val => |val| {
if (val.rows.len == 0) {
std.debug.print("ok\n", .{});
return;
}
std.debug.print("| ", .{});
for (val.fields) |field| {
std.debug.print("{s}\t\t|", .{field});
}
std.debug.print("\n", .{});
std.debug.print("+ ", .{});
for (val.fields) |field| {
var fieldLen = field.len;
while (fieldLen > 0) {
std.debug.print("=", .{});
fieldLen -= 1;
}
std.debug.print("\t\t+", .{});
}
std.debug.print("\n", .{});
for (val.rows) |row| {
std.debug.print("| ", .{});
for (row) |cell| {
std.debug.print("{s}\t\t|", .{cell});
}
std.debug.print("\n", .{});
}
},
}
}