/// <summary>
/// Считается ли данная лексема логическим сравнением?
/// <, >, <=, >=, ==, !=
/// </summary>
public static bool isLogicCompare(LexemKind kind)
{
return(kind == LexemKind.LESSER ||
kind == LexemKind.GREATER ||
kind == LexemKind.LESSER_EQUALS ||
kind == LexemKind.GREATER_EQUALS ||
kind == LexemKind.EQUALS ||
kind == LexemKind.NOTEQUALS);
}
/// <summary>
/// Пропарсить синтаксический примитив
/// (любой литерал, унарные операции и просто переменные или вызовы функций)
/// </summary>
/// <param name="lexems">список лексем примитива</param>
private static ICommand parsePrimitive(List <Lexem> lexems)
{
if (lexems.Count == 0)
{
return(null);
}
LexemKind kind = lexems[0].kind;
if (kind == LexemKind.NOT)
{
lexems.RemoveAt(0);
return(new CommandUnary(parsePrimitive(lexems), LexemKind.NOT));
}
else if (kind == LexemKind.BRACE && lexems.Count == 1)
{
return(parseStatement(lexems[0].childs));
}
else if (kind == LexemKind.NUMBER && lexems.Count == 1)
{
return(new CommandNumeric(int.Parse(lexems[0].value)));
}
else if (kind == LexemKind.STRING && lexems.Count == 1)
{
return(new CommandString(lexems[0].value));
}
else if (kind == LexemKind.STRING_VARIABLED && lexems.Count == 1)
{
return(new CommandStringVariabled(lexems[0].value));
}
else if (kind == LexemKind.TRUE && lexems.Count == 1)
{
return(new CommandBool(true));
}
else if (kind == LexemKind.FALSE && lexems.Count == 1)
{
return(new CommandBool(false));
}
else if (kind == LexemKind.IDENTIFIER)
{
return(parseNamedPrimitive(lexems));
}
else if (kind == LexemKind.INCREMENT || kind == LexemKind.DECREMENT)
{
lexems.RemoveAt(0);
if (lexems.Count == 1 && lexems[0].kind == LexemKind.IDENTIFIER)
{
return(new CommandUnary(new CommandVariable(lexems[0].value), kind));
}
}
throw new InvalidOperationException("Неизвестный синтаксический примитив! " + string.Join(", ", lexems.Select(s => s.kind.ToString()).ToArray()));
}
protected Lexem(LexemKind kind)
{
Kind = kind;
}
private bool Check(LexemKind lexem, int lexemId)
{
var lex = Lexems[lexemId];
if (lex.Kind != lexem)
return false;
return true;
}
private bool Ensure(int lexemId, LexemKind type, string msg, params object[] args)
{
var lex = Lexems[lexemId];
if(lex.Kind != type)
{
error(msg, lexemId, args);
return false;
}
return true;
}
GLRCommandTree CreateVariable(LexemKind LexemType, Type CLRType)
{
if(Lexems[LexemId].Kind == LexemType
&& Ensure(LexemId+1, LexemKind.Identifier, "Ожидается имя переменной!")
&& Ensure(LexemId+2, LexemKind.Semicolon, "Ожидается точка с запятой!")
)
{
GameLanguageRuntime.CreateVariableCommand command = new GameLanguageRuntime.CreateVariableCommand();
command.VariableType = CLRType;
command.VariableName = Lexems[LexemId+1].Value;
if(createdVariables.ContainsKey(command.VariableName))
error("Переменная {0} уже объявленна", LexemId+1, Lexems[LexemId+1].Value);
else
createdVariables.Add(command.VariableName,CLRType);
LexemId+=3;
GLRCommandTree tree = new GLRCommandTree();
tree.Value = command;
return tree;
}
return null;
}
protected Lexem(LexemKind kind)
{
Kind = kind;
}
/// <summary>
/// Парсит математическое или логическое выражение, разделённое
/// при помощи +, -, *, /, логическое сравнение, &&, ||.
/// Делит выражение рекурсивно по этапам, компонуя разделённые части на каждом этапе
/// определённой командой (например, CommandMath)
/// </summary>
/// <param name="lexems">список лексем, который нужно разделить</param>
/// <param name="level">уровень деления</param>
private static ICommand parseCommandPart(List <Lexem> lexems, int level)
{
if (level >= 7)
{
return(parsePrimitive(lexems));
}
int count = 1;
List <List <Lexem> > list = new List <List <Lexem> >();
LexemKind compareKind = LexemKind.UNKNOWN;
List <Lexem> buffer = new List <Lexem>();
foreach (Lexem lexem in lexems)
{
if (level == 0)
{
if (lexem.kind == LexemKind.AND)
{
count++;
list.Add(buffer);
buffer = new List <Lexem>();
continue;
}
}
else if (level == 1)
{
if (lexem.kind == LexemKind.OR)
{
count++;
list.Add(buffer);
buffer = new List <Lexem>();
continue;
}
}
else if (level == 2)
{
if (LexemDefinitions.isLogicCompare(lexem.kind))
{
count++;
list.Add(buffer);
buffer = new List <Lexem>();
compareKind = lexem.kind;
continue;
}
}
else if (level == 3)
{
if (lexem.kind == LexemKind.PLUS)
{
count++;
list.Add(buffer);
buffer = new List <Lexem>();
continue;
}
}
else if (level == 4)
{
if (lexem.kind == LexemKind.MINUS)
{
count++;
list.Add(buffer);
buffer = new List <Lexem>();
continue;
}
}
else if (level == 5)
{
if (lexem.kind == LexemKind.MULTIPLY)
{
count++;
list.Add(buffer);
buffer = new List <Lexem>();
continue;
}
}
else if (level == 6)
{
if (lexem.kind == LexemKind.DIVIDE)
{
count++;
list.Add(buffer);
buffer = new List <Lexem>();
continue;
}
}
buffer.Add(lexem);
}
if (count == 1)
{
return(parseCommandPart(buffer, level + 1));
}
else
{
list.Add(buffer);
if (level == 0)
{
CommandLogicCompound compound = new CommandLogicCompound(LexemKind.AND);
foreach (List <Lexem> sub in list)
{
compound.addBlock(parseCommandPart(sub, level + 1));
}
return(compound);
}
else if (level == 1)
{
CommandLogicCompound compound = new CommandLogicCompound(LexemKind.OR);
foreach (List <Lexem> sub in list)
{
compound.addBlock(parseCommandPart(sub, level + 1));
}
return(compound);
}
else if (level == 2)
{
if (compareKind == LexemKind.UNKNOWN || count > 2)
{
return(null);
}
CommandLogic compound = new CommandLogic(
compareKind,
parseCommandPart(list[0], level + 1),
parseCommandPart(list[1], level + 1)
);
return(compound);
}
else if (level == 3)
{
CommandMath compound = new CommandMath(LexemKind.PLUS);
foreach (List <Lexem> sub in list)
{
compound.addBlock(parseCommandPart(sub, level + 1));
}
return(compound);
}
else if (level == 4)
{
CommandMath compound = new CommandMath(LexemKind.MINUS);
foreach (List <Lexem> sub in list)
{
compound.addBlock(parseCommandPart(sub, level + 1));
}
return(compound);
}
else if (level == 5)
{
CommandMath compound = new CommandMath(LexemKind.MULTIPLY);
foreach (List <Lexem> sub in list)
{
compound.addBlock(parseCommandPart(sub, level + 1));
}
return(compound);
}
else if (level == 6)
{
CommandMath compound = new CommandMath(LexemKind.DIVIDE);
foreach (List <Lexem> sub in list)
{
compound.addBlock(parseCommandPart(sub, level + 1));
}
return(compound);
}
}
return(null);
}
public CommandLogic(LexemKind operation, ICommand left, ICommand right)
{
this.operation = operation;
this.left = left;
this.right = right;
}
private void parse(List <Lexem> list)
{
LexemKind kind = LexemKind.UNKNOWN;
LexemKind prevKind = LexemKind.UNKNOWN;
while (offset < sourceLength)
{
//пропуск лишних символов (пробел, таб, новая строка, перенос каретки)
char c = source[offset];
while (offset < sourceLength && LexemDefinitions.isEmptyCharacter(c))
{
offset++;
if (offset >= sourceLength)
{
break;
}
c = source[offset];
}
if (offset >= sourceLength || LexemDefinitions.isCloseBrace(c))
{
offset++;
break;
}
/*Match match = COMMENT.Match(source, offset);
* if (match.Success) {
* this.offset += match.Length;
* continue;
* }*/
Lexem lexem = parseStatic() ?? parseDynamic();
if (lexem == null)
{
throw new Exception(string.Format("Неизвестная лексема на позиции {0}: {1}", offset, source.Substring(offset, Math.Min(30, sourceLength - offset)).Replace("<", "<").Replace(">", ">")));
}
kind = lexem.kind;
if (kind == LexemKind.BRACE || kind == LexemKind.BLOCK || kind == LexemKind.INDEX)
{
List <Lexem> childs = new List <Lexem>();
parse(childs);
lexem.childs = childs;
}
else if (kind == LexemKind.NUMBER && prevKind == LexemKind.MINUS)
{
if (list.Count >= 2 && (list[list.Count - 2].kind == LexemKind.ASSIGN || list[list.Count - 2].kind == LexemKind.COMMA))
{
list.RemoveAt(list.Count - 1);
}
else
{
list[list.Count - 1].kind = LexemKind.PLUS;
}
lexem.value = "-" + lexem.value;
}
list.Add(lexem);
prevKind = kind;
}
}
public CommandLogic(Stream stream, SerializationInfo info)
{
operation = (LexemKind)stream.ReadByte();
left = SerializationHelper.deSerialize(stream, info);
right = SerializationHelper.deSerialize(stream, info);
}
public CommandUnary(ICommand command, LexemKind operation)
{
this.command = command;
this.operation = operation;
}
public CommandUnary(Stream stream, SerializationInfo info)
{
command = SerializationHelper.deSerialize(stream, info);
operation = (LexemKind)stream.ReadByte();
}
public CommandLogicCompound(LexemKind operation)
{
this.operation = operation;
}
public CommandLogicCompound(Stream stream, SerializationInfo info)
{
operation = (LexemKind)stream.ReadByte();
SerializationHelper.deserializeBlock(stream, info, blocks);
}
public StaticLexemDefinition(string representation, LexemKind kind)
{
this.representation = representation;
this.kind = kind;
this.isKeyword = false;
}
public DynamicLexemDefinition(string representation, LexemKind kind, string flags)
{
this.representation = new Regex(@"\G" + flags + representation, RegexOptions.Compiled);
this.kind = kind;
}
public CommandMath(LexemKind operation)
{
this.operation = operation;
}