//****************************************************************************************************
public AssignCommand(string name, string expr) {
m_array = false;
m_expr = new Expression(expr);
m_name = name;
if (!Parser.IsID(name))
throw new SyntaxErrorException("ќшибочное использование ключевого слова");
}
//****************************************************************************************************
public static IOperator CompileOperator(string str) {
Parser p = new Parser(str);
if (!p.HasMore()) {
return new EmptyCommand();
}
String pstr = p.GetString();
p.MoveNext();
string firsttoken = (p.Current as String);
if (firsttoken == "for") {
try {
return ParseForStatement(p.GetString());
} catch (SyntaxErrorException ex) {
throw ex;
} catch (Exception ex) {
throw new SyntaxErrorException(ex.Message);
}
}
int posa = pstr.IndexOf(":=");
if (posa >= 0) {
int cq = 0;
for (int iq = 0; iq < posa; iq++)
if (pstr[iq] == '\"')
cq++;
if (cq%2 == 0) {
try {
if (posa == 0)
throw new SyntaxErrorException("Синтаксическая ошибка");
try {
if (pstr[posa - 1] == '}') {
int posob = pstr.IndexOf('{');
if ((posob < 0) || (posob > posa))
throw new SyntaxErrorException("Синтаксическая ошибка");
return new AssignCommand(pstr.Substring(0, posob),
pstr.Substring(posob + 1, posa - posob - 2),
pstr.Substring(posa + 2));
} else {
return new AssignCommand(pstr.Substring(0, posa),
pstr.Substring(posa + 2));
}
} catch {
throw new SyntaxErrorException("Синтаксическая ошибка");
}
} catch (CalcException ex) {
throw new SyntaxErrorException(ex.Message);
}
}
}
try {
if (firsttoken == "clear") {
if (!p.MoveNext())
throw new SyntaxErrorException("Синтаксическая ошибка");
Command cc = new ClearCommand(p.Current as String);
if (p.MoveNext())
throw new SyntaxErrorException("Синтаксическая ошибка");
return cc;
} else if (firsttoken == "next") {
if (p.MoveNext())
throw new SyntaxErrorException("Синтаксическая ошибка");
return new NextOperator();
} else if (firsttoken == "else") {
if (p.MoveNext())
throw new SyntaxErrorException("Синтаксическая ошибка");
return new ElseOperator();
} else if (firsttoken == "endif") {
if (p.MoveNext())
throw new SyntaxErrorException("Синтаксическая ошибка");
return new EndifOperator();
} else if (firsttoken == "loop") {
if (p.MoveNext())
throw new SyntaxErrorException("Синтаксическая ошибка");
return new LoopOperator();
} else if (firsttoken == "return") {
if (p.MoveNext())
throw new SyntaxErrorException("Синтаксическая ошибка");
return new ReturnOperator();
} else if (firsttoken == "error") {
if (p.MoveNext())
throw new SyntaxErrorException("Синтаксическая ошибка");
return new ErrorOperator();
}
Expression expr = new Expression(p);
if (firsttoken == "print")
return new PrintCommand(expr);
else if (firsttoken == "println")
return new PrintLnCommand(expr);
else if (firsttoken == "call")
return new CallCommand(expr);
else if (firsttoken == "while")
return new WhileOperator(expr);
else if (firsttoken == "if")
return new IfOperator(expr);
else if (firsttoken == "elseif")
return new ElseifOperator(expr);
else
throw new SyntaxErrorException("Синтаксическая ошибка");
} catch (SyntaxErrorException ex) {
throw ex;
} catch (Exception ex) {
throw new SyntaxErrorException(ex.Message);
}
}
//****************************************************************************************************
private static IOperator ParseForStatement(string str) {
str = str.Substring(3);
int assignpos = str.IndexOf(":=");
if (assignpos < 0)
throw new SyntaxErrorException("Неправильный синтаксис оператора for");
string countername = str.Substring(0, assignpos).Trim();
if (!Parser.IsID(countername))
throw new SyntaxErrorException("Неправильный синтаксис оператора for");
str = str.Substring(assignpos + 2);
int colonpos = str.IndexOf(":");
if (colonpos < 0)
throw new SyntaxErrorException("Неправильный синтаксис оператора for");
string expr1str = str.Substring(0, colonpos);
string expr2str = str.Substring(colonpos + 1);
Expression expr1 = new Expression(expr1str);
Expression expr2 = new Expression(expr2str);
return new ForOperator(countername, expr1, expr2);
}
//****************************************************************************************************
public static Command CompileCommand(string str) {
Parser p = new Parser(str);
if (!p.HasMore()) {
return new EmptyCommand();
}
String pstr = p.GetString();
int posa = pstr.IndexOf(":=");
if (posa >= 0) {
int cq = 0;
for (int iq = 0; iq < posa; iq++)
if (pstr[iq] == '\"')
cq++;
if (cq%2 == 0) {
try {
if (posa == 0)
throw new SyntaxErrorException("Синтаксическая ошибка");
try {
if (pstr[posa - 1] == '}') {
int posob = pstr.IndexOf('{');
if ((posob < 0) || (posob > posa))
throw new SyntaxErrorException("Синтаксическая ошибка");
return new AssignCommand(pstr.Substring(0, posob),
pstr.Substring(posob + 1, posa - posob - 2),
pstr.Substring(posa + 2));
} else {
return new AssignCommand(pstr.Substring(0, posa),
pstr.Substring(posa + 2));
}
} catch {
throw new SyntaxErrorException("Синтаксическая ошибка");
}
} catch (CalcException ex) {
throw new SyntaxErrorException(ex.Message);
}
}
}
p.MoveNext();
string firsttoken = (p.Current as String);
try {
if (firsttoken == "clear") {
if (!p.MoveNext())
throw new SyntaxErrorException("Синтаксическая ошибка");
Command cc = new ClearCommand(p.Current as String);
if (p.MoveNext())
throw new SyntaxErrorException("Синтаксическая ошибка");
return cc;
}
if (firsttoken == "print") {
Expression expr = new Expression(p);
return new PrintCommand(expr);
} else if (firsttoken == "println") {
Expression expr = new Expression(p);
return new PrintLnCommand(expr);
} else if (firsttoken == "call") {
Expression expr = new Expression(p);
return new CallCommand(expr);
} else {
p.Reset();
Expression expr1 = new Expression(p);
return new PrintLnCommand(expr1);
}
} catch (SyntaxErrorException ex) {
throw ex;
} catch (Exception ex) {
throw new SyntaxErrorException(ex.Message);
}
}
//****************************************************************************************************
public PrintCommand(Expression expr) {
m_expr = expr;
}
//****************************************************************************************************
public WhileOperator(Expression expr) {
m_expr = expr;
}
public ElseifOperator(Expression expr)
{
m_expr = expr;
}
public IfOperator(Expression expr)
{
m_expr = expr;
}
