public override Expression Scan(ParseEngine engine)
{
var start = engine.Pointer;
var chars = engine.Characters;
if (chars[start] == '{')
{
var index = start;
var line = engine.CurrentLine;
var column = engine.CurrentColumn;
engine.Advance();
index++;
var query = engine.Query;
var scope = new QueryContext(query, query.Input.Substring(index));
var eng = scope.Parser.SetOffset(line, column + 1).Parse();
if (!eng.IsTerminated)
{
engine.AddError(new YAMPScopeNotClosedError(line, column));
}
foreach (var error in eng.Errors)
{
engine.AddError(error);
}
engine.Advance(eng.Pointer);
return new GroupExpression(line, column, engine.Pointer - start, scope);
}
return null;
}
public FunctionKeyword(Int32 line, Int32 column, QueryContext query)
: this()
{
Query = query;
StartLine = line;
StartColumn = column;
}
public DoKeyword(Int32 line, Int32 column, QueryContext query)
: this()
{
StartLine = line;
StartColumn = column;
Query = query;
}
/// <summary>
/// Creates a new instance with some parameters.
/// </summary>
/// <param name="line">The line where the scope expression starts.</param>
/// <param name="column">The column in the line where the scope exp. starts.</param>
/// <param name="length">The length of the scope expression.</param>
/// <param name="scope">The associated query context (scope).</param>
public GroupExpression(Int32 line, Int32 column, Int32 length, QueryContext scope)
: base(scope.Parent, line, column)
{
_scope = scope;
IsSingleStatement = true;
Length = length;
}
public BreakKeyword(Int32 line, Int32 column, QueryContext query)
: this()
{
Query = query;
StartLine = line;
StartColumn = column;
Length = Token.Length;
}
QueryContext GetBreakableContext(QueryContext context)
{
if (!context.CurrentStatement.IsKeyword<BreakableKeyword>())
{
context.Stop();
return GetBreakableContext(context.Parent);
}
return context;
}
/// <summary>
/// Creates a new instance of the parse engine.
/// </summary>
/// <param name="query">The query context to consider.</param>
/// <param name="context">The parser context to use.</param>
public ParseEngine(QueryContext query, ParseContext context)
{
_context = context;
_query = query;
_characters = query.Input.ToCharArray();
_errors = new List<YAMPParseError>();
_statements = new List<Statement>();
_markers = Marker.None;
_currentLine = 1;
_currentColumn = 1;
}
void StopAllContexts(QueryContext context)
{
context.Stop();
context.CurrentStatement.IsMuted = false;
if (context.CurrentStatement.IsKeyword<BreakableKeyword>())
{
context.CurrentStatement.GetKeyword<BreakableKeyword>().Break();
}
if (context.Parent != null)
{
StopAllContexts(context.Parent);
}
}
public Value Function(StringValue code)
{
var c = new ParseContext(Context);
var q = new QueryContext(c, code.Value);
var p = new ParseEngine(q, c).Parse();
if (p.CanRun)
{
foreach (var statement in p.Statements)
{
return statement.Interpret(new Dictionary<String, Value>());
}
}
return new StringValue();
}
/// <summary>
/// Creates a new instance with some parameters.
/// </summary>
/// <param name="line">The line where the matrix expression starts.</param>
/// <param name="column">The column in the line where the matrix exp. starts.</param>
/// <param name="length">The length of the matrix expression.</param>
/// <param name="query">The associated query context.</param>
/// <param name="child">The child containing the column and rows.</param>
public MatrixExpression(Int32 line, Int32 column, Int32 length, QueryContext query, ContainerExpression child)
: base(child, query, line, column)
{
Length = length;
}
/// <summary>
/// Creates a new (underlying) QueryContext
/// </summary>
/// <param name="query">The query context to copy</param>
/// <param name="input">The new input to use.</param>
internal QueryContext(QueryContext query, String input)
: this(query._context, input)
{
Parent = query;
_parser.Parent = query.Parser;
}
/// <summary>
/// Execute the parsing of the given input.
/// </summary>
/// <param name="input">The input to parse.</param>
/// <returns>The query context for further evaluation.</returns>
public QueryContext Parse(String input)
{
var query = new QueryContext(_primary, input);
query.Parser.Parse();
return query;
}
/// <summary>
/// Execute the evaluation of this parser instance with external symbols.
/// </summary>
/// <param name="input">The input to evaluate.</param>
/// <param name="values">
/// The values in an Hashtable containing string (name), Value (value) pairs.
/// </param>
/// <returns>The value from the evaluation.</returns>
public Value Evaluate(String input, Dictionary<String, Value> values)
{
var query = new QueryContext(_primary, input);
query.Run(values);
return query.Output;
}
/// <summary>
/// Creates a new FunctionValue with data to parse.
/// </summary>
/// <param name="arguments">The list of argument identifiers.</param>
/// <param name="body">The string representation of the body.</param>
public FunctionValue(String[] arguments, String body)
{
_arguments = arguments;
_body = body;
_canSerialize = true;
_perform = (context, argument) =>
{
var query = new QueryContext(context, body);
var expression = query.Parser.ParseStatement().Container;
SetPerform(arguments, expression);
return Perform(context, argument);
};
}
