/// <summary>
/// Gets the key.
/// </summary>
/// <param name="token">The token.</param>
/// <returns>System.String.</returns>
/// <exception cref="ServiceStack.Script.SyntaxErrorException">Invalid Key. Expected a Literal or Identifier but was {token.DebugToken()}</exception>
public static string GetKey(JsToken token)
{
return(token switch {
JsLiteral literalKey => literalKey.Value.ToString(),
JsIdentifier identifierKey => identifierKey.Name,
JsMemberExpression {
Property : JsIdentifier prop
} => prop.Name,
public static StringSegment ParseJsCallExpression(this StringSegment literal, out JsCallExpression expression, bool filterExpression = false)
{
literal = literal.ParseIdentifier(out var token);
if (!(token is JsIdentifier identifier))
{
throw new SyntaxErrorException($"Expected identifier but instead found '{token}'");
}
literal = literal.AdvancePastWhitespace();
if (literal.IsNullOrEmpty() || literal.GetChar(0) != '(')
{
var isWhitespaceSyntax = filterExpression && literal.GetChar(0) == ':';
if (isWhitespaceSyntax)
{
literal = literal.Advance(1);
// replace everything after ':' up till new line and rewrite as single string to method
var endStringPos = literal.IndexOf("\n");
var endStatementPos = literal.IndexOf("}}");
if (endStringPos == -1 || (endStatementPos != -1 && endStatementPos < endStringPos))
{
endStringPos = endStatementPos;
}
if (endStringPos == -1)
{
throw new SyntaxErrorException($"Whitespace sensitive syntax did not find a '\\n' new line to mark the end of the statement, near '{literal.SubstringWithElipsis(0,50)}'");
}
var originalArg = literal.Subsegment(0, endStringPos).Trim().ToString();
var rewrittenArgs = originalArg.Replace("{", "{{").Replace("}", "}}");
var strArg = new JsLiteral(rewrittenArgs);
expression = new JsCallExpression(identifier, strArg);
return(literal.Subsegment(endStringPos));
}
expression = new JsCallExpression(identifier);
return(literal);
}
literal.Advance(1);
literal = literal.ParseArguments(out var args, termination: ')');
expression = new JsCallExpression(identifier, args.ToArray());
return(literal);
}
protected virtual JsExpression CompileMethodCall(MethodCallExpression methodExpression, DataContextStack dataContext, JsExpression callbackFunction = null)
{
if (!methodExpression.Method.IsDefined(typeof(AllowStaticCommandAttribute)))
{
throw new Exception($"Method '{methodExpression.Method.DeclaringType.Name}.{methodExpression.Method.Name}' used in static command has to be marked with [AllowStaticCommand] attribute.");
}
if (callbackFunction == null)
{
callbackFunction = new JsLiteral(null);
}
if (methodExpression == null)
{
throw new NotSupportedException("Static command binding must be a method call!");
}
var argsScript = GetArgsScript(methodExpression, dataContext);
return(new JsIdentifierExpression("dotvvm").Member("staticCommandPostback").Invoke(new JsSymbolicParameter(CommandBindingExpression.ViewModelNameParameter), new JsSymbolicParameter(CommandBindingExpression.SenderElementParameter), new JsLiteral(GetMethodName(methodExpression)), argsScript, callbackFunction));
}
internal static ReadOnlySpan <char> ParseWhitespaceArgument(this ReadOnlySpan <char> literal, out JsToken argument)
{
// replace everything after ':' up till new line and rewrite as single string to method
var endStringPos = literal.IndexOf("\n");
var endStatementPos = literal.IndexOf("}}");
if (endStringPos == -1 || (endStatementPos != -1 && endStatementPos < endStringPos))
{
endStringPos = endStatementPos;
}
if (endStringPos == -1)
{
throw new SyntaxErrorException($"Whitespace sensitive syntax did not find a '\\n' new line to mark the end of the statement, near {literal.DebugLiteral()}");
}
var originalArg = literal.Slice(0, endStringPos).Trim().ToString();
var rewrittenArgs = originalArg.Replace("{", "{{").Replace("}", "}}");
var strArg = new JsLiteral(rewrittenArgs);
argument = strArg;
return(literal.Slice(endStringPos));
}
protected virtual JsExpression CompileMethodCall(MethodCallExpression methodExpression, DataContextStack dataContext, JsExpression callbackFunction = null)
{
var jsTranslation = javascriptTranslator.TryTranslateMethodCall(methodExpression.Object, methodExpression.Arguments.ToArray(), methodExpression.Method, dataContext)
?.ApplyAction(javascriptTranslator.AdjustViewModelProperties);
if (jsTranslation != null)
{
if (!(jsTranslation.Annotation <ResultIsPromiseAnnotation>() is ResultIsPromiseAnnotation promiseAnnotation))
{
throw new Exception($"Expected javascript translation that returns a promise");
}
var expr = promiseAnnotation.GetPromiseFromExpression?.Invoke(jsTranslation) ?? jsTranslation;
return(expr.Member("then").Invoke(callbackFunction));
}
if (!methodExpression.Method.IsDefined(typeof(AllowStaticCommandAttribute)))
{
throw new Exception($"Method '{methodExpression.Method.DeclaringType.Name}.{methodExpression.Method.Name}' used in static command has to be marked with [AllowStaticCommand] attribute.");
}
if (callbackFunction == null)
{
callbackFunction = new JsLiteral(null);
}
if (methodExpression == null)
{
throw new NotSupportedException("Static command binding must be a method call!");
}
var(plan, args) = CreateExecutionPlan(methodExpression, dataContext);
var encryptedPlan = EncryptJson(SerializePlan(plan), protector).Apply(Convert.ToBase64String);
return(new JsIdentifierExpression("dotvvm").Member("staticCommandPostback")
.Invoke(new JsSymbolicParameter(CommandBindingExpression.ViewModelNameParameter), new JsSymbolicParameter(CommandBindingExpression.SenderElementParameter), new JsLiteral(encryptedPlan), new JsArrayExpression(args), callbackFunction)
.WithAnnotation(new StaticCommandInvocationJsAnnotation(plan)));
}
public static StringSegment ParseJsToken(this StringSegment literal, out JsToken token, bool filterExpression)
{
literal = literal.AdvancePastWhitespace();
if (literal.IsNullOrEmpty())
{
token = null;
return(literal);
}
var c = literal.GetChar(0);
if (c == '(')
{
literal = literal.Advance(1);
literal = literal.ParseJsExpression(out var bracketsExpr);
literal = literal.AdvancePastWhitespace();
c = literal.GetChar(0);
if (c == ')')
{
literal = literal.Advance(1);
token = bracketsExpr;
return(literal);
}
throw new SyntaxErrorException($"Expected ')' but instead found '{c}': {literal.SubstringWithElipsis(0, 50)}");
}
token = null;
c = (char)0;
if (literal.IsNullOrEmpty())
{
return(TypeConstants.EmptyStringSegment);
}
var i = 0;
literal = literal.AdvancePastWhitespace();
var firstChar = literal.GetChar(0);
if (firstChar == '\'' || firstChar == '"' || firstChar == '`' || firstChar == '′')
{
i = 1;
var hasEscapeChar = false;
while (i < literal.Length && ((c = literal.GetChar(i)) != firstChar || literal.GetChar(i - 1) == '\\'))
{
i++;
if (!hasEscapeChar)
{
hasEscapeChar = c == '\\';
}
}
if (i >= literal.Length || literal.GetChar(i) != firstChar)
{
throw new SyntaxErrorException($"Unterminated string literal: {literal}");
}
var str = literal.Substring(1, i - 1);
token = new JsLiteral(str);
if (hasEscapeChar)
{
var sb = StringBuilderCache.Allocate();
for (var j = 0; j < str.Length; j++)
{
// strip the back-slash used to escape quote char in strings
var ch = str[j];
if (ch != '\\' || (j + 1 >= str.Length || str[j + 1] != firstChar))
{
sb.Append(ch);
}
}
token = new JsLiteral(StringBuilderCache.ReturnAndFree(sb));
}
return(literal.Advance(i + 1));
}
if (firstChar >= '0' && firstChar <= '9')
{
i = 1;
var hasExponent = false;
var hasDecimal = false;
while (i < literal.Length && IsNumericChar(c = literal.GetChar(i)) ||
(hasExponent = (c == 'e' || c == 'E')))
{
if (c == '.')
{
hasDecimal = true;
}
i++;
if (hasExponent)
{
i += 2; // [e+1]0
while (i < literal.Length && IsNumericChar(literal.GetChar(i)))
{
i++;
}
break;
}
}
var numLiteral = literal.Subsegment(0, i);
//don't convert into ternary to avoid Type coercion
if (hasDecimal || hasExponent)
{
token = new JsLiteral(numLiteral.TryParseDouble(out double d) ? d : default(double));
}
else
{
token = new JsLiteral(numLiteral.ParseSignedInteger());
}
return(literal.Advance(i));
}
if (firstChar == '{')
{
var props = new List <JsProperty>();
literal = literal.Advance(1);
while (!literal.IsNullOrEmpty())
{
literal = literal.AdvancePastWhitespace();
if (literal.GetChar(0) == '}')
{
literal = literal.Advance(1);
break;
}
literal = literal.ParseJsToken(out var mapKeyToken);
if (!(mapKeyToken is JsLiteral) && !(mapKeyToken is JsIdentifier))
{
throw new SyntaxErrorException($"'{mapKeyToken}' is not a valid Object key, expected literal or identifier.");
}
JsToken mapValueToken;
bool shorthand = false;
literal = literal.AdvancePastWhitespace();
if (literal.Length > 0 && literal.GetChar(0) == ':')
{
literal = literal.Advance(1);
literal = literal.ParseJsExpression(out mapValueToken);
}
else
{
shorthand = true;
if (literal.Length == 0 || (c = literal.GetChar(0)) != ',' && c != '}')
{
throw new SyntaxErrorException($"Unterminated object literal near: {literal.SubstringWithElipsis(0, 50)}");
}
mapValueToken = mapKeyToken;
}
props.Add(new JsProperty(mapKeyToken, mapValueToken, shorthand));
literal = literal.AdvancePastWhitespace();
if (literal.IsNullOrEmpty())
{
break;
}
if (literal.GetChar(0) == '}')
{
literal = literal.Advance(1);
break;
}
literal = literal.AdvancePastChar(',');
literal = literal.AdvancePastWhitespace();
}
token = new JsObjectExpression(props);
return(literal);
}
if (firstChar == '[')
{
literal = literal.ParseArguments(out var elements, termination: ']');
token = new JsArrayExpression(elements);
return(literal);
}
if (firstChar.IsOperatorChar())
{
if (literal.StartsWith(">="))
{
token = JsGreaterThanEqual.Operator;
return(literal.Advance(2));
}
if (literal.StartsWith("<="))
{
token = JsLessThanEqual.Operator;
return(literal.Advance(2));
}
if (literal.StartsWith("!=="))
{
token = JsStrictNotEquals.Operator;
return(literal.Advance(3));
}
if (literal.StartsWith("!="))
{
token = JsNotEquals.Operator;
return(literal.Advance(2));
}
if (literal.StartsWith("==="))
{
token = JsStrictEquals.Operator;
return(literal.Advance(3));
}
if (literal.StartsWith("=="))
{
token = JsEquals.Operator;
return(literal.Advance(2));
}
if (literal.StartsWith("||"))
{
token = JsOr.Operator;
return(literal.Advance(2));
}
if (literal.StartsWith("&&"))
{
token = JsAnd.Operator;
return(literal.Advance(2));
}
if (literal.StartsWith("<<"))
{
token = JsBitwiseLeftShift.Operator;
return(literal.Advance(2));
}
if (literal.StartsWith(">>"))
{
token = JsBitwiseRightShift.Operator;
return(literal.Advance(2));
}
switch (firstChar)
{
case '>':
token = JsGreaterThan.Operator;
return(literal.Advance(1));
case '<':
token = JsLessThan.Operator;
return(literal.Advance(1));
case '=':
token = JsAssignment.Operator;
return(literal.Advance(1));
case '!':
token = JsNot.Operator;
return(literal.Advance(1));
case '+':
token = JsAddition.Operator;
return(literal.Advance(1));
case '-':
token = JsSubtraction.Operator;
return(literal.Advance(1));
case '*':
token = JsMultiplication.Operator;
return(literal.Advance(1));
case '/':
token = JsDivision.Operator;
return(literal.Advance(1));
case '&':
token = JsBitwiseAnd.Operator;
return(literal.Advance(1));
case '|':
token = JsBitwiseOr.Operator;
return(literal.Advance(1));
case '^':
token = JsBitwiseXOr.Operator;
return(literal.Advance(1));
case '%':
token = JsMod.Operator;
return(literal.Advance(1));
default:
throw new SyntaxErrorException($"Invalid Operator found near: '{literal.SubstringWithElipsis(0, 50)}'");
}
}
// identifier
var preIdentifierLiteral = literal;
literal = literal.ParseIdentifier(out var node);
literal = literal.AdvancePastWhitespace();
if (!literal.IsNullOrEmpty())
{
c = literal.GetChar(i);
if (c == '.' || c == '[')
{
while (true)
{
literal = literal.Advance(1);
if (c == '.')
{
literal = literal.AdvancePastWhitespace();
literal = literal.ParseIdentifier(out var property);
node = new JsMemberExpression(node, property, computed: false);
}
else if (c == '[')
{
literal = literal.AdvancePastWhitespace();
literal = literal.ParseJsExpression(out var property);
node = new JsMemberExpression(node, property, computed: true);
literal = literal.AdvancePastWhitespace();
if (literal.IsNullOrEmpty() || literal.GetChar(0) != ']')
{
throw new SyntaxErrorException($"Expected ']' but was '{literal.GetChar(0)}'");
}
literal = literal.Advance(1);
}
literal = literal.AdvancePastWhitespace();
if (literal.IsNullOrWhiteSpace())
{
break;
}
c = literal.GetChar(0);
if (c == '(')
{
throw new SyntaxErrorException("Call expression found on member expression. Only filters can be invoked.");
}
if (!(c == '.' || c == '['))
{
break;
}
}
}
else if (c == '(' || (filterExpression && c == ':'))
{
literal = preIdentifierLiteral.ParseJsCallExpression(out var callExpr, filterExpression: filterExpression);
token = callExpr;
return(literal);
}
}
token = node;
return(literal);
}
