public static void Start(InputCommand input, Display display)
{
var commands = new List<ICommand>();
var env = new Env();
// register commands
RegisterCommands(commands);
display.TextWriters.Add(Console.Out);
// show welcome message
display.WriteWelcome();
while (input.Running)
{
// read next command from user or queue
var cmd = input.ReadCommand();
if (string.IsNullOrEmpty(cmd)) continue;
try
{
var s = new StringScanner(cmd);
var found = false;
// test all commands
foreach (var command in commands)
{
if (!command.IsCommand(s)) continue;
// test if command it's only shell command
if (command.Access == DataAccess.None)
{
command.Execute(null, s, display, input, env);
}
else
{
using (var engine = env.CreateEngine(command.Access))
{
command.Execute(engine, s, display, input, env);
}
}
found = true;
break;
}
if (!found) throw new ShellExpcetion("Command not found");
}
catch (Exception ex)
{
display.WriteError(ex.Message);
}
}
}
/// <summary>
/// If command is a console command, execute and returns true - if not, just returns false
/// </summary>
public static bool TryExecute(string command, ref IShellEngine engine, Display display, InputCommand input)
{
var s = new StringScanner(command);
foreach (var cmd in _commands)
{
if (cmd.IsCommand(s))
{
cmd.Execute(ref engine, s, display, input);
return true;
}
}
return false;
}
/// <summary>
/// If command is a console command, execute and returns true - if not, just returns false
/// </summary>
public static bool TryExecute(string command, LiteShell shell, Display display, InputCommand input)
{
var s = new StringScanner(command);
foreach (var cmd in Commands)
{
if (cmd.IsCommand(s))
{
cmd.Execute(shell, s, display, input);
return true;
}
}
return false;
}
public BsonValue Run(DbEngine engine, string command)
{
if (string.IsNullOrEmpty(command)) return BsonValue.Null;
var s = new StringScanner(command);
foreach (var cmd in _commands)
{
if (cmd.IsCommand(s))
{
return cmd.Execute(engine, s);
}
}
throw LiteException.InvalidCommand(command);
}
public abstract void Execute(ref IShellEngine engine, StringScanner s, Display display, InputCommand input);
/// <summary>
/// Read Id file
/// </summary>
public string ReadId(StringScanner s)
{
return(s.Scan(LiteFileInfo.ID_PATTERN.Substring(1, LiteFileInfo.ID_PATTERN.Length - 2)));
}
public bool IsCommand(StringScanner s)
{
return(this.IsCollectionCommand(s, "select"));
}
public bool IsCommand(StringScanner s)
{
return(this.IsCollectionCommand(s, "drop[iI]ndex"));
}
public bool IsCommand(StringScanner s)
{
return(this.IsFileCommand(s, "delete"));
}
public IEnumerable <BsonValue> Execute(StringScanner s, LiteEngine engine)
{
var col = this.ReadCollection(engine, s);
// single document update
if (s.Match(@"\s*\{"))
{
var doc = JsonSerializer.Deserialize(s.ToString()).AsDocument;
s.ThrowIfNotFinish();
yield return(engine.Update(col, doc));
}
// query update
else
{
// db.colName.update
// field = value,
// array += valueToAdd,
// where _id = 1
// and ...
var query = Query.All();
var updates = new Update();
while (!s.HasTerminated)
{
var path = BsonExpression.ReadExpression(s, true, true).Source;
var action = s.Scan(@"\s*(\+)?=\s*", 1).ThrowIfEmpty("Invalid operator (support = or +=)", s);
var value = this.ReadBsonValue(s);
var expr = value == null?BsonExpression.ReadExpression(s, true, false)?.Source : null;
if (action == "+" && value != null)
{
updates.Add(path, value);
}
else if (action == "+" && expr != null)
{
updates.AddExpr(path, expr);
}
else if (action == "" && value != null)
{
updates.Set(path, value);
}
else if (action == "" && expr != null)
{
updates.SetExpr(path, expr);
}
else
{
throw LiteException.SyntaxError(s);
}
s.Scan(@"\s*");
if (s.Scan(@",\s*").Length > 0)
{
continue;
}
else if (s.Scan(@"where\s*").Length > 0 || s.HasTerminated)
{
break;
}
else
{
throw LiteException.SyntaxError(s);
}
}
if (!s.HasTerminated)
{
query = this.ReadQuery(s, false);
}
s.ThrowIfNotFinish();
yield return(engine.Update(col, query, updates));
}
}
public abstract void Execute(LiteShell shell, StringScanner s, Display display, InputCommand input);
public bool IsCommand(StringScanner s)
{
return(s.Scan(@"db.info$").Length > 0);
}
public IEnumerable <BsonValue> Execute(StringScanner s, LiteEngine engine)
{
yield return(engine.Info());
}
public IEnumerable <BsonValue> Execute(StringScanner s, LiteEngine engine)
{
var col = this.ReadCollection(engine, s);
yield return(engine.DropCollection(col));
}
public bool IsFileCommand(StringScanner s, string command)
{
return(s.Scan(@"fs\." + command + @"\s*").Length > 0);
}
public abstract bool IsCommand(StringScanner s);
/// <summary>
/// Read collection name from db.(collection).(command)
/// </summary>
public string ReadCollection(LiteEngine db, StringScanner s)
{
return(s.Scan(@"db\.([\w-]+)\.\w+\s*", 1));
}
public bool IsCollectionCommand(StringScanner s, string command)
{
return(s.Match(@"db\.[\w-]+\." + command));
}
public IEnumerable <BsonValue> Execute(StringScanner s, LiteEngine engine)
{
var col = this.ReadCollection(engine, s);
// single document update
if (s.Match(@"\s*\{"))
{
var doc = JsonSerializer.Deserialize(s.ToString()).AsDocument;
s.ThrowIfNotFinish();
yield return(engine.Update(col, doc));
}
// query update
else
{
// db.colName.update
// field = value,
// array += valueToAdd,
// where _id = 1
// and ...
var updates = new List <UpdateData>();
var query = Query.All();
while (!s.HasTerminated)
{
var path = BsonExpression.ReadExpression(s, true, true).Source;
var action = s.Scan(@"\s*\+?=\s*").Trim().ThrowIfEmpty("Invalid operator (support = or +=)", s);
var value = this.ReadBsonValue(s);
var expr = value == null?BsonExpression.ReadExpression(s, true, false) : null;
if (action != "+=" && action != "=")
{
throw LiteException.SyntaxError(s);
}
if (value == null && expr == null)
{
throw LiteException.SyntaxError(s);
}
updates.Add(new UpdateData {
Path = path, Value = value, Expr = expr, Add = action == "+="
});
s.Scan(@"\s*");
if (s.Scan(@",\s*").Length > 0)
{
continue;
}
else if (s.Scan(@"where\s*").Length > 0 || s.HasTerminated)
{
break;
}
else
{
throw LiteException.SyntaxError(s);
}
}
if (!s.HasTerminated)
{
query = this.ReadQuery(s, false);
}
s.ThrowIfNotFinish();
// fetch documents to update
var count = engine.Update(col, this.FetchDocuments(engine, col, query, updates));
yield return(count);
}
}
public abstract void Execute(LiteShell shell, StringScanner s, Display display, InputCommand input);
public static void Start(InputCommand input, Display display)
{
var commands = new List <ICommand>();
var env = new Env();
LiteEngine engine = null;
// register commands
RegisterCommands(commands);
display.TextWriters.Add(Console.Out);
// show welcome message
display.WriteWelcome();
while (input.Running)
{
// read next command from user or queue
var cmd = input.ReadCommand();
if (string.IsNullOrEmpty(cmd))
{
continue;
}
try
{
var s = new StringScanner(cmd);
var found = false;
// test all commands
foreach (var command in commands)
{
if (!command.IsCommand(s))
{
continue;
}
command.Execute(engine, s, display, input, env);
if (env.Filename != null && engine == null)
{
engine = env.CreateEngine(DataAccess.Write);
}
found = true;
break;
}
if (!found)
{
throw new ShellExpcetion("Command not found");
}
}
catch (Exception ex)
{
display.WriteError(ex.Message);
}
}
}
public abstract void Execute(ref IShellEngine engine, StringScanner s, Display display, InputCommand input);
public IEnumerable <BsonValue> Execute(StringScanner s, LiteEngine engine)
{
var col = this.ReadCollection(engine, s);
var fields = new Dictionary <string, BsonExpression>();
var index = 0;
// read all fields definitions (support AS as keyword no name field)
while (!s.HasTerminated)
{
// try read any kind of expression
var expression = BsonExpression.ReadExpression(s, false, false);
// if not found a valid one, try read only as path (will add $. before)
if (expression == null)
{
expression = BsonExpression.ReadExpression(s, true, true);
}
//var expression = BsonExpression.ReadExpression(s, true, false);
var key = s.Scan(@"\s*as\s+([\w-]+)", 1).TrimToNull()
?? this.NamedField(expression)
?? ("expr" + (++index));
// if key already exits, add with another name
while (fields.ContainsKey(key))
{
key = "expr" + (++index);
}
fields.Add(key, expression);
if (s.Scan(@"\s*,\s*").Length > 0)
{
continue;
}
break;
}
// select command required output value, path or expression
if (fields.Count == 0)
{
throw LiteException.SyntaxError(s, "Missing select path");
}
var query = Query.All();
if (s.Scan(@"\s*where\s*").Length > 0)
{
query = this.ReadQuery(s, true);
}
var skipLimit = this.ReadSkipLimit(s);
var includes = this.ReadIncludes(s);
s.ThrowIfNotFinish();
var docs = engine.Find(col, query, includes, skipLimit.Key, skipLimit.Value);
foreach (var doc in docs)
{
// if is a single value, return as just field
if (fields.Count == 1)
{
foreach (var value in fields.Values.First().Execute(doc, false))
{
yield return(value);
}
}
else
{
var output = new BsonDocument();
foreach (var field in fields)
{
output[field.Key] = field.Value.Execute(doc, true).First();
}
yield return(output);
}
}
}
public abstract bool IsCommand(StringScanner s);
public bool IsCommand(StringScanner s)
{
return(this.IsFileCommand(s, "upload"));
}
public abstract void Execute(ref LiteDatabase db, StringScanner s, Display display, InputCommand input);
