public Expression CalculateScriptFunctionCall(ScriptFunctionCall scriptFunctionCall, ParameterFinder parameterFinder, List <Expression> arguments)
{
var args = scriptFunctionCall.Arguments.Select(arg => GetExpressionBody(arg, parameterFinder, null));
//add first argument if it's being supplied (probably from ScriptPipeCall)
if (arguments != null)
{
args = arguments.Union(args);
}
// we are attempting to pull the bottom target member up, so we know the method Name
var toMember = scriptFunctionCall.Target as ScriptMemberExpression;
if (toMember == null)
{
throw new NotSupportedException();
}
else
{
var argumentTypes = args.ToNullSafe().Select(e => e.Type);
var targetType = GetExpressionBody(toMember.Target, parameterFinder, null);
ScriptVariable functionNameScript = toMember.Member;
var methodInfo = memberFinder.FindMember(targetType.Type, functionNameScript.Name, argumentTypes.ToArray());
var convertedArgs = ConvertArgs(methodInfo as MethodInfo, args);
return(ExpressionHelpers.CallMember(targetType, methodInfo, convertedArgs));
}
}
/// <summary>
/// The evaluates a string as a scriban expression or evaluate the passed function or return the passed value.
/// </summary>
/// <param name="context">The template context</param>
/// <param name="span">The source span</param>
/// <param name="value">The input value, either a scriban template in a string, or an alias function or directly a value.</param>
/// <returns>The evaluation of the input value.</returns>
/// <remarks>
/// ```scriban-html
/// {{ "1 + 2" | object.eval }}
/// ```
/// ```html
/// 3
/// ```
/// </remarks>
public static object Eval(TemplateContext context, SourceSpan span, object value)
{
if (value == null)
{
return(null);
}
if (value is string templateStr)
{
try
{
var template = Template.Parse(templateStr, lexerOptions: new LexerOptions()
{
Lang = context.Language, Mode = ScriptMode.ScriptOnly
});
return(context.Evaluate(template.Page));
}
catch (Exception ex)
{
throw new ArgumentException(ex.Message, nameof(value));
}
}
if (value is IScriptCustomFunction function)
{
return(ScriptFunctionCall.Call(context, context.CurrentNode, function, false, null));
}
return(value);
}
private void TransformLiquidFunctionCallToScriban(ScriptFunctionCall functionCall)
{
var liquidTarget = functionCall.Target as ScriptVariable;
string targetName;
string memberName;
// In case of cycle we transform it to array.cycle at runtime
if (liquidTarget != null && LiquidBuiltinsFunctions.TryLiquidToScriban(liquidTarget.Name, out targetName, out memberName))
{
var arrayCycle = new ScriptMemberExpression
{
Span = liquidTarget.Span,
Target = new ScriptVariableGlobal(targetName)
{
Span = liquidTarget.Span
},
Member = new ScriptVariableGlobal(memberName)
{
Span = liquidTarget.Span
},
};
// Transfer trivias accordingly to target (trivias before) and member (trivias after)
if (_isKeepTrivia && liquidTarget.Trivias != null)
{
arrayCycle.Target.AddTrivias(liquidTarget.Trivias.Before, true);
arrayCycle.Member.AddTrivias(liquidTarget.Trivias.After, false);
}
functionCall.Target = arrayCycle;
}
}
private static IEnumerable EachInternal(TemplateContext context, ScriptNode callerContext, SourceSpan span, IEnumerable list, IScriptCustomFunction function, Type destType)
{
var arg = new ScriptArray(1);
foreach (var item in list)
{
var itemToTransform = context.ToObject(span, item, destType);
arg[0] = itemToTransform;
var itemTransformed = ScriptFunctionCall.Call(context, callerContext, function, arg);
yield return(itemTransformed);
}
}
public object Invoke(TemplateContext context, ScriptNode callerContext, ScriptArray arguments, ScriptBlockStatement blockStatement)
{
if (arguments == null || arguments.Count == 0)
{
throw new ScriptRuntimeException(callerContext.Span, string.Format(RS.BadFunctionInvokeArgEmpty, "where"));
}
if (arguments.Count == 1)
{
return(arguments[0]);
}
// the second argument is a condition
ScriptFunctionCall funcCall = (ScriptFunctionCall)callerContext;
ScriptExpression condition = funcCall.Arguments[0];
// hold the result in an array
ScriptArray result = new ScriptArray();
// the first argument doesn't have to be an array
try
{
// string is enumerable but we want to treat it as a whole
if (arguments[0] is string)
{
throw new InvalidCastException();
}
IEnumerable array = (IEnumerable)arguments[0];
foreach (object item in array)
{
if ((bool)ReplaceCondition(condition, item).Evaluate(context))
{
result.Add(item);
}
}
}
catch (InvalidCastException)
{
if ((bool)ReplaceCondition(condition, arguments[0]).Evaluate(context))
{
return(arguments[0]);
}
}
catch (Exception ex)
{
throw new ScriptParserRuntimeException(callerContext.Span, string.Format("RS.FilterFunctionException"), null, ex);
}
return(result);
}
static IEnumerable FilterInternal(TemplateContext context, SourceSpan span, IEnumerable list, IScriptCustomFunction function, Type destType)
{
var arg = new ScriptArray(1);
foreach (var item in list)
{
var itemToTransform = context.ToObject(span, item, destType);
arg[0] = itemToTransform;
var itemTransformed = ScriptFunctionCall.Call(context, context.CurrentNode, function, arg);
if (context.ToBool(span, itemTransformed))
{
yield return(itemToTransform);
}
}
}
/// <summary>
/// Parses the referenced include templates from a template
/// </summary>
/// <param name="template">Template to parse</param>
/// <returns>List of referenced include</returns>
private async Task <List <IncludeExportTemplateReference> > ParseIncludeTemplates(ExportTemplate template)
{
Template parsedTemplate = Template.Parse(template.Code);
List <IncludeExportTemplateReference> includeTemplateRefs = new List <IncludeExportTemplateReference>();
List <ScriptStatement> statementsToCheck = ScribanStatementExtractor.ExtractPlainNonTextStatements(parsedTemplate);
foreach (ScriptStatement curStatement in statementsToCheck)
{
if (!(curStatement is ScriptExpressionStatement))
{
continue;
}
ScriptExpressionStatement expressionStatement = (ScriptExpressionStatement)curStatement;
if (expressionStatement.Expression == null || !(expressionStatement.Expression is ScriptFunctionCall))
{
continue;
}
ScriptFunctionCall functionCall = (ScriptFunctionCall)expressionStatement.Expression;
if (functionCall.Target == null || functionCall.Target.ToString() != "include")
{
continue;
}
if (functionCall.Arguments.Count < 1)
{
continue;
}
string templateName = functionCall.Arguments[0].ToString().Trim('\"').Trim('\'');
IncludeExportTemplate existingTemplate = await _cachedDbAccess.GetIncludeTemplateByName(template.ProjectId, templateName);
if (existingTemplate != null && !includeTemplateRefs.Any(e => e.IncludeTemplateId == existingTemplate.Id))
{
includeTemplateRefs.Add(new IncludeExportTemplateReference {
IncludeTemplateId = existingTemplate.Id,
Name = existingTemplate.Name
});
}
}
return(includeTemplateRefs);
}
/// <summary>
/// Evaluates the specified expression
/// </summary>
/// <param name="targetExpression">The expression to evaluate</param>
/// <param name="valueToSet">A value to set in case of a setter</param>
/// <param name="setter">true if this a setter</param>
/// <returns>The value of the targetExpression</returns>
private object GetOrSetValue(ScriptExpression targetExpression, object valueToSet, bool setter)
{
object value = null;
try
{
if (targetExpression is IScriptVariablePath nextPath)
{
if (setter)
{
nextPath.SetValue(this, valueToSet);
}
else
{
value = nextPath.GetValue(this);
}
}
else if (!setter)
{
value = Evaluate(targetExpression);
}
else
{
throw new ScriptRuntimeException(targetExpression.Span, $"Unsupported target expression for assignment."); // unit test: 105-assign-error1.txt
}
}
catch (Exception readonlyException) when(_getOrSetValueLevel == 1 && !(readonlyException is ScriptRuntimeException))
{
throw new ScriptRuntimeException(targetExpression.Span, $"Unexpected exception while accessing target expression: {readonlyException.Message}", readonlyException);
}
// If the variable being returned is a function, we need to evaluate it
// If function call is disabled, it will be only when returning the final object (level 0 of recursion)
var allowFunctionCall = (_isFunctionCallDisabled && _getOrSetValueLevel > 1) || !_isFunctionCallDisabled;
if (allowFunctionCall && ScriptFunctionCall.IsFunction(value))
{
// Allow to pipe arguments only for top level returned function
value = ScriptFunctionCall.Call(this, targetExpression, value, _getOrSetValueLevel == 1, null);
}
return(value);
}
/// <summary>
/// Returns a language key
/// </summary>
/// <param name="templateContext">Template context</param>
/// <param name="callerContext">Call context</param>
/// <param name="arguments">Arguments</param>
/// <returns>Language key</returns>
private async ValueTask <object> GetLanguageKey(TemplateContext templateContext, ScriptNode callerContext, ScriptArray arguments)
{
ScriptFunctionCall functionCall = callerContext as ScriptFunctionCall;
if (functionCall == null)
{
_errorCollection.AddCanNotGenerateLanguageKey(ScribanErrorUtil.FormatScribanSpan(callerContext.Span));
return("<<USE NON PIPE NOTATION FOR LANGKEY>>");
}
if (functionCall.Arguments.Count != 1 || arguments.Count != 1)
{
_errorCollection.AddCanNotGenerateLanguageKey(ScribanErrorUtil.FormatScribanSpan(callerContext.Span));
return("<<PASS IN EXACTLY ONE ARGUMENT FOR LANGKEY>>");
}
List <string> callHierarchy = ScribanParsingUtil.GetCallerHierarchy(functionCall.Arguments[0]);
return(await GenerateLanguageKeyFromCallHierarchy(templateContext, callerContext, callHierarchy));
}
/// <summary>
/// The evaluates a string as a scriban template or evaluate the passed function or return the passed value.
/// </summary>
/// <param name="context">The template context</param>
/// <param name="span">The source span</param>
/// <param name="value">The input value, either a scriban template in a string, or an alias function or directly a value.</param>
/// <returns>The evaluation of the input value.</returns>
/// <remarks>
/// ```scriban-html
/// {{ "This is a template text {{ 1 + 2 }}" | object.eval_template }}
/// ```
/// ```html
/// This is a template text 3
/// ```
/// </remarks>
public static object EvalTemplate(TemplateContext context, SourceSpan span, object value)
{
if (value == null)
{
return(null);
}
if (value is string templateStr)
{
try
{
var template = Template.Parse(templateStr, lexerOptions: new LexerOptions()
{
Lang = context.Language, Mode = ScriptMode.Default
});
var output = new StringBuilderOutput();
context.PushOutput(output);
try
{
context.Evaluate(template.Page);
}
finally
{
context.PopOutput();
}
return(output.ToString());
}
catch (Exception ex)
{
throw new ArgumentException(ex.Message, nameof(value));
}
}
if (value is IScriptCustomFunction function)
{
return(ScriptFunctionCall.Call(context, context.CurrentNode, function, false, null));
}
return(value);
}
public static string Join(TemplateContext context, SourceSpan span, IEnumerable list, string delimiter, object function = null)
{
if (list == null)
{
return(string.Empty);
}
var scriptingFunction = function as IScriptCustomFunction;
if (function != null && scriptingFunction == null)
{
throw new ArgumentException($"The parameter `{function}` is not a function. Maybe prefix it with @?", nameof(function));
}
var text = new StringBuilder();
bool afterFirst = false;
var arg = new ScriptArray(1);
foreach (var obj in list)
{
if (afterFirst)
{
text.Append(delimiter);
}
var item = context.ObjectToString(obj);
if (scriptingFunction != null)
{
arg[0] = item;
var result = ScriptFunctionCall.Call(context, context.CurrentNode, scriptingFunction, arg);
item = context.ObjectToString(result);
}
text.Append(item);
afterFirst = true;
}
return(text.ToString());
}
public override void Evaluate(TemplateContext context)
{
// Check that the Target is actually a function
var functionCall = Target as ScriptFunctionCall;
if (functionCall == null)
{
var parameterLessFunction = context.Evaluate(Target, true);
if (!(parameterLessFunction is IScriptCustomFunction))
{
var targetPrettyname = ScriptSyntaxAttribute.Get(Target);
throw new ScriptRuntimeException(Target.Span, $"Expecting a direct function instead of the expression [{Target}/{targetPrettyname.Name}]");
}
context.BlockDelegates.Push(Body);
context.Result = ScriptFunctionCall.Call(context, this, parameterLessFunction);
}
else
{
context.BlockDelegates.Push(Body);
context.Result = context.Evaluate(functionCall);
}
}
private ScriptExpression ParseExpression(ScriptNode parentNode, ref bool hasAnonymousFunction, ScriptExpression parentExpression = null, int precedence = 0)
{
int expressionCount = 0;
expressionLevel++;
try
{
ScriptFunctionCall functionCall = null;
parseExpression:
expressionCount++;
ScriptExpression leftOperand = null;
switch (Current.Type)
{
case TokenType.Identifier:
case TokenType.IdentifierSpecial:
leftOperand = ParseVariableOrLiteral();
// Special handle of the $$ block delegate variable
if (ScriptVariable.BlockDelegate.Equals(leftOperand))
{
if (expressionCount != 1 || expressionLevel > 1)
{
LogError("Cannot use block delegate $$ in a nested expression");
}
if (!(parentNode is ScriptExpressionStatement))
{
LogError(parentNode, "Cannot use block delegate $$ outside an expression statement");
}
return(leftOperand);
}
break;
case TokenType.Integer:
leftOperand = ParseInteger();
break;
case TokenType.Float:
leftOperand = ParseFloat();
break;
case TokenType.String:
leftOperand = ParseString();
break;
case TokenType.OpenParent:
leftOperand = ParseParenthesis(ref hasAnonymousFunction);
break;
case TokenType.OpenBrace:
leftOperand = ParseObjectInitializer();
break;
case TokenType.OpenBracket:
leftOperand = ParseArrayInitializer();
break;
case TokenType.Not:
case TokenType.Minus:
case TokenType.Arroba:
case TokenType.Plus:
case TokenType.Caret:
leftOperand = ParseUnaryExpression(ref hasAnonymousFunction);
break;
}
// Should not happen but in case
if (leftOperand == null)
{
LogError($"Unexpected token [{Current.Type}] for expression");
return(null);
}
if (leftOperand is ScriptAnonymousFunction)
{
hasAnonymousFunction = true;
}
while (!hasAnonymousFunction)
{
// Parse Member expression are expected to be followed only by an identifier
if (Current.Type == TokenType.Dot)
{
var nextToken = PeekToken();
if (nextToken.Type == TokenType.Identifier)
{
NextToken();
var memberExpression = Open <ScriptMemberExpression>();
memberExpression.Target = leftOperand;
var member = ParseVariableOrLiteral();
if (!(member is ScriptVariable))
{
LogError("Unexpected literal member [{member}]");
return(null);
}
memberExpression.Member = (ScriptVariable)member;
leftOperand = Close(memberExpression);
}
else
{
LogError(nextToken,
$"Invalid token [{nextToken.Type}]. The dot operator is expected to be followed by a plain identifier");
return(null);
}
continue;
}
// If we have a bracket but left operand is a (variable || member || indexer), then we consider next as an indexer
// unit test: 130-indexer-accessor-accept1.txt
if (Current.Type == TokenType.OpenBracket && leftOperand is ScriptVariablePath && !IsPreviousCharWhitespace())
{
NextToken();
var indexerExpression = Open <ScriptIndexerExpression>();
indexerExpression.Target = leftOperand;
// unit test: 130-indexer-accessor-error5.txt
indexerExpression.Index = ExpectAndParseExpression(indexerExpression, ref hasAnonymousFunction, functionCall, 0, $"Expecting <index_expression> instead of [{Current.Type}]");
if (Current.Type != TokenType.CloseBracket)
{
LogError($"Unexpected [{Current.Type}]. Expecting ']'");
}
else
{
NextToken();
}
leftOperand = Close(indexerExpression);
continue;
}
if (Current.Type == TokenType.Equal)
{
var assignExpression = Open <ScriptAssignExpression>();
if (expressionLevel > 1)
{
// unit test: 101-assign-complex-error1.txt
LogError(assignExpression, $"Expression is only allowed for a top level assignment");
}
NextToken();
assignExpression.Target = leftOperand;
// unit test: 105-assign-error3.txt
assignExpression.Value = ExpectAndParseExpression(assignExpression, ref hasAnonymousFunction, parentExpression);
leftOperand = Close(assignExpression);
continue;
}
// Handle binary operators here
ScriptBinaryOperator binaryOperatorType;
if (BinaryOperators.TryGetValue(Current.Type, out binaryOperatorType))
{
var newPrecedence = GetOperatorPrecedence(binaryOperatorType);
// Check precedence to see if we should "take" this operator here (Thanks TimJones for the tip code! ;)
if (newPrecedence < precedence)
{
break;
}
var binaryExpression = Open <ScriptBinaryExpression>();
binaryExpression.Left = leftOperand;
binaryExpression.Operator = binaryOperatorType;
NextToken(); // skip the operator
// unit test: 110-binary-simple-error1.txt
binaryExpression.Right = ExpectAndParseExpression(binaryExpression, ref hasAnonymousFunction,
functionCall ?? parentExpression, newPrecedence,
$"Expecting an <expression> to the right of the operator instead of [{Current.Type}]");
leftOperand = Close(binaryExpression);
continue;
}
if (precedence > 0)
{
break;
}
// If we can parse a statement, we have a method call
if (StartAsExpression())
{
if (parentExpression != null)
{
break;
}
if (functionCall == null)
{
functionCall = Open <ScriptFunctionCall>();
functionCall.Target = leftOperand;
}
else
{
functionCall.Arguments.Add(leftOperand);
}
goto parseExpression;
}
if (Current.Type == TokenType.Pipe)
{
if (functionCall != null)
{
functionCall.Arguments.Add(leftOperand);
leftOperand = functionCall;
}
var pipeCall = Open <ScriptPipeCall>();
pipeCall.From = leftOperand;
NextToken(); // skip |
// unit test: 310-func-pipe-error1.txt
pipeCall.To = ExpectAndParseExpression(pipeCall, ref hasAnonymousFunction);
return(Close(pipeCall));
}
break;
}
if (functionCall != null)
{
functionCall.Arguments.Add(leftOperand);
return(functionCall);
}
return(Close(leftOperand));
}
finally
{
expressionLevel--;
}
}
private ScriptExpression ParseExpression(ScriptNode parentNode, ref bool hasAnonymousFunction, ScriptExpression parentExpression = null, int precedence = 0,
ParseExpressionMode mode = ParseExpressionMode.Default)
{
int expressionCount = 0;
_expressionLevel++;
var expressionDepthBeforeEntering = _expressionDepth;
EnterExpression();
try
{
ScriptFunctionCall functionCall = null;
parseExpression:
expressionCount++;
ScriptExpression leftOperand = null;
switch (Current.Type)
{
case TokenType.Identifier:
case TokenType.IdentifierSpecial:
leftOperand = ParseVariable();
// In case of liquid template, we accept the syntax colon after a tag
if (_isLiquid && parentNode is ScriptPipeCall && Current.Type == TokenType.Colon)
{
NextToken();
}
// Special handle of the $$ block delegate variable
if (ScriptVariable.BlockDelegate.Equals(leftOperand))
{
if (expressionCount != 1 || _expressionLevel > 1)
{
LogError("Cannot use block delegate $$ in a nested expression");
}
if (!(parentNode is ScriptExpressionStatement))
{
LogError(parentNode, "Cannot use block delegate $$ outside an expression statement");
}
return(leftOperand);
}
break;
case TokenType.Integer:
leftOperand = ParseInteger();
break;
case TokenType.Float:
leftOperand = ParseFloat();
break;
case TokenType.String:
leftOperand = ParseString();
break;
case TokenType.ImplicitString:
leftOperand = ParseImplicitString();
break;
case TokenType.VerbatimString:
leftOperand = ParseVerbatimString();
break;
case TokenType.OpenParent:
leftOperand = ParseParenthesis(ref hasAnonymousFunction);
break;
case TokenType.OpenBrace:
leftOperand = ParseObjectInitializer();
break;
case TokenType.OpenBracket:
leftOperand = ParseArrayInitializer();
break;
case TokenType.Not:
case TokenType.Minus:
case TokenType.Arroba:
case TokenType.Plus:
case TokenType.Caret:
leftOperand = ParseUnaryExpression(ref hasAnonymousFunction);
break;
}
// Should not happen but in case
if (leftOperand == null)
{
if (functionCall != null)
{
LogError($"Unexpected token `{GetAsText(Current)}` while parsing function call `{functionCall}`");
}
else
{
LogError($"Unexpected token `{GetAsText(Current)}` while parsing expression");
}
return(null);
}
if (leftOperand is ScriptAnonymousFunction)
{
hasAnonymousFunction = true;
}
while (!hasAnonymousFunction)
{
if (_isLiquid && Current.Type == TokenType.Comma && functionCall != null)
{
NextToken(); // Skip the comma for arguments in a function call
}
// Parse Member expression are expected to be followed only by an identifier
if (Current.Type == TokenType.Dot)
{
var nextToken = PeekToken();
if (nextToken.Type == TokenType.Identifier)
{
NextToken();
if (GetAsText(Current) == "empty" && PeekToken().Type == TokenType.Question)
{
var memberExpression = Open <ScriptIsEmptyExpression>();
NextToken(); // skip empty
NextToken(); // skip ?
memberExpression.Target = leftOperand;
leftOperand = Close(memberExpression);
}
else
{
var memberExpression = Open <ScriptMemberExpression>();
memberExpression.Target = leftOperand;
var member = ParseVariable();
if (!(member is ScriptVariable))
{
LogError("Unexpected literal member `{member}`");
return(null);
}
memberExpression.Member = (ScriptVariable)member;
leftOperand = Close(memberExpression);
}
}
else
{
LogError(nextToken, $"Invalid token `{nextToken.Type}`. The dot operator is expected to be followed by a plain identifier");
return(null);
}
continue;
}
// If we have a bracket but left operand is a (variable || member || indexer), then we consider next as an indexer
// unit test: 130-indexer-accessor-accept1.txt
if (Current.Type == TokenType.OpenBracket && leftOperand is IScriptVariablePath && !IsPreviousCharWhitespace())
{
NextToken();
var indexerExpression = Open <ScriptIndexerExpression>();
indexerExpression.Target = leftOperand;
// unit test: 130-indexer-accessor-error5.txt
indexerExpression.Index = ExpectAndParseExpression(indexerExpression, ref hasAnonymousFunction, functionCall, 0, $"Expecting <index_expression> instead of `{Current.Type}`");
if (Current.Type != TokenType.CloseBracket)
{
LogError($"Unexpected `{Current.Type}`. Expecting ']'");
}
else
{
NextToken();
}
leftOperand = Close(indexerExpression);
continue;
}
if (mode == ParseExpressionMode.BasicExpression)
{
break;
}
if (Current.Type == TokenType.Equal)
{
var assignExpression = Open <ScriptAssignExpression>();
if (_expressionLevel > 1)
{
// unit test: 101-assign-complex-error1.txt
LogError(assignExpression, $"Expression is only allowed for a top level assignment");
}
NextToken();
assignExpression.Target = TransformKeyword(leftOperand);
// unit test: 105-assign-error3.txt
assignExpression.Value = ExpectAndParseExpression(assignExpression, ref hasAnonymousFunction, parentExpression);
leftOperand = Close(assignExpression);
continue;
}
// Handle binary operators here
ScriptBinaryOperator binaryOperatorType;
if (BinaryOperators.TryGetValue(Current.Type, out binaryOperatorType) || (_isLiquid && TryLiquidBinaryOperator(out binaryOperatorType)))
{
var newPrecedence = GetOperatorPrecedence(binaryOperatorType);
// Check precedence to see if we should "take" this operator here (Thanks TimJones for the tip code! ;)
if (newPrecedence <= precedence)
{
break;
}
// We fake entering an expression here to limit the number of expression
EnterExpression();
var binaryExpression = Open <ScriptBinaryExpression>();
binaryExpression.Left = leftOperand;
binaryExpression.Operator = binaryOperatorType;
NextToken(); // skip the operator
// unit test: 110-binary-simple-error1.txt
binaryExpression.Right = ExpectAndParseExpression(binaryExpression, ref hasAnonymousFunction,
functionCall ?? parentExpression, newPrecedence,
$"Expecting an <expression> to the right of the operator instead of `{Current.Type}`");
leftOperand = Close(binaryExpression);
continue;
}
if (precedence > 0)
{
break;
}
if (StartAsExpression())
{
// If we can parse a statement, we have a method call
if (parentExpression != null)
{
break;
}
// Parse named parameters
var paramContainer = parentNode as IScriptNamedArgumentContainer;
if (Current.Type == TokenType.Identifier && (parentNode is IScriptNamedArgumentContainer || !_isLiquid && PeekToken().Type == TokenType.Colon))
{
if (paramContainer == null)
{
if (functionCall == null)
{
functionCall = Open <ScriptFunctionCall>();
functionCall.Target = leftOperand;
functionCall.Span.Start = leftOperand.Span.Start;
}
else
{
functionCall.Arguments.Add(leftOperand);
}
Close(leftOperand);
}
while (true)
{
if (Current.Type != TokenType.Identifier)
{
break;
}
var parameter = Open <ScriptNamedArgument>();
var parameterName = GetAsText(Current);
parameter.Name = parameterName;
// Skip argument name
NextToken();
if (paramContainer != null)
{
paramContainer.AddParameter(Close(parameter));
}
else
{
functionCall.Arguments.Add(parameter);
}
// If we have a colon, we have a value
// otherwise it is a boolean argument name
if (Current.Type == TokenType.Colon)
{
NextToken();
parameter.Value = ExpectAndParseExpression(parentNode, mode: ParseExpressionMode.BasicExpression);
parameter.Span.End = parameter.Value.Span.End;
}
if (functionCall != null)
{
functionCall.Span.End = parameter.Span.End;
}
}
// As we have handled leftOperand here, we don't let the function out of this while to pick up the leftOperand
if (functionCall != null)
{
leftOperand = functionCall;
functionCall = null;
}
// We don't allow anything after named parameters
break;
}
if (functionCall == null)
{
functionCall = Open <ScriptFunctionCall>();
functionCall.Target = leftOperand;
// If we need to convert liquid to scriban functions:
if (_isLiquid && Options.LiquidFunctionsToScriban)
{
TransformLiquidFunctionCallToScriban(functionCall);
}
functionCall.Span.Start = leftOperand.Span.Start;
}
else
{
functionCall.Arguments.Add(leftOperand);
}
goto parseExpression;
}
if (Current.Type == TokenType.Pipe)
{
if (functionCall != null)
{
functionCall.Arguments.Add(leftOperand);
leftOperand = functionCall;
}
var pipeCall = Open <ScriptPipeCall>();
pipeCall.From = leftOperand;
NextToken(); // skip |
// unit test: 310-func-pipe-error1.txt
pipeCall.To = ExpectAndParseExpression(pipeCall, ref hasAnonymousFunction);
return(Close(pipeCall));
}
break;
}
if (functionCall != null)
{
functionCall.Arguments.Add(leftOperand);
functionCall.Span.End = leftOperand.Span.End;
return(functionCall);
}
return(Close(leftOperand));
}
finally
{
LeaveExpression();
// Force to restore back to a level
_expressionDepth = expressionDepthBeforeEntering;
_expressionLevel--;
}
}
private ScriptStatement ParseLiquidIncludeStatement()
{
ScriptFunctionCall include = Open <ScriptFunctionCall>();
include.Target = ParseVariable();
Token templateNameToken = Current;
ScriptExpression templateName = ExpectAndParseExpression(include, mode: ParseExpressionMode.BasicExpression);
if (templateName != null)
{
var literal = templateName as ScriptLiteral;
if (!(literal?.Value is string || templateName is IScriptVariablePath))
{
LogError(templateNameToken, string.Format(RS.UnexpectedIncludeTemplateName, templateName));
}
include.Arguments.Add(templateName);
}
Close(include);
ScriptExpressionStatement includeStatement = new ScriptExpressionStatement()
{
Span = include.Span, Expression = include
};
ScriptForStatement forStatement = null;
ScriptBlockStatement block = null;
if (Current.Type == TokenType.Identifier)
{
string next = GetAsText(Current);
// Parse with <value>
// Create a block statement equivalent:
// this[target] = value;
// include target
if (next == "with")
{
NextToken(); // skip with
ScriptAssignExpression assignExpression = Open <ScriptAssignExpression>();
assignExpression.Target = new ScriptIndexerExpression()
{
Target = new ScriptThisExpression {
Span = CurrentSpan
},
Index = templateName
};
assignExpression.Value = ExpectAndParseExpression(include, mode: ParseExpressionMode.BasicExpression);
Close(assignExpression);
block = new ScriptBlockStatement {
Span = include.Span
};
block.Statements.Add(new ScriptExpressionStatement()
{
Span = assignExpression.Span,
Expression = assignExpression
});
block.Statements.Add(includeStatement);
Close(block);
}
else if (next == "for")
{
// Create a block statement equivalent:
// for this[target] in value
// include target
// end
NextToken(); // skip for
forStatement = Open <ScriptForStatement>();
forStatement.Variable = new ScriptIndexerExpression()
{
Target = new ScriptThisExpression {
Span = CurrentSpan
},
Index = templateName
};
forStatement.Iterator = ExpectAndParseExpression(include, mode: ParseExpressionMode.BasicExpression);
forStatement.Body = new ScriptBlockStatement()
{
Span = include.Span
};
forStatement.Body.Statements.Add(includeStatement);
Close(forStatement);
}
// For following variable separated by colon, add them as assignment before the include
while (Current.Type == TokenType.Identifier)
{
Token variableToken = Current;
ScriptExpression variableObject = ParseVariable();
var variable = variableObject as ScriptVariable;
if (variable == null)
{
LogError(variableToken, string.Format(RS.UnexpectedVariableInInclude, GetAsText(variableToken)));
}
if (Current.Type == TokenType.Colon)
{
NextToken(); // skip :
}
else
{
LogError(Current, string.Format(RS.UnexpectedTokenAfterVariable, GetAsText(Current), variable, ":"));
}
if (block == null)
{
block = new ScriptBlockStatement {
Span = include.Span
};
block.Statements.Add(includeStatement);
}
ScriptAssignExpression assignExpression = Open <ScriptAssignExpression>();
assignExpression.Target = variable;
assignExpression.Value = ExpectAndParseExpression(include, mode: ParseExpressionMode.BasicExpression);
block.Statements.Insert(0, new ScriptExpressionStatement()
{
Span = assignExpression.Span,
Expression = assignExpression
});
if (Current.Type == TokenType.Comma)
{
NextToken();
}
}
ExpectEndOfStatement(includeStatement);
// If we only have an include for, return it directly
if (forStatement != null)
{
if (block == null)
{
return(Close(forStatement));
}
block.Statements.Add(forStatement);
}
// Else we have a block
if (block != null)
{
Close(block);
return(block);
}
}
ExpectEndOfStatement(includeStatement);
return(Close(includeStatement));
}
private ScriptExpressionStatement ParseLiquidCycleStatement()
{
ScriptExpressionStatement statement = Open <ScriptExpressionStatement>();
ScriptFunctionCall functionCall = Open <ScriptFunctionCall>();
statement.Expression = functionCall;
functionCall.Target = ParseVariable();
if (Options.ConvertLiquidFunctions)
{
TransformFromLiquidFunctionCall(functionCall);
}
ScriptArrayInitializerExpression arrayInit = null;
// Parse cycle without group: cycle "a", "b", "c" => transform to textscript: array.cycle ["a", "b", "c"]
// Parse cycle with group: cycle "group1": "a", "b", "c" => transform to textscript: array.cycle ["a", "b", "c"] "group1"
bool isFirst = true;
while (IsVariableOrLiteral(Current))
{
ScriptExpression value = ParseVariableOrLiteral();
if (isFirst && Current.Type == TokenType.Colon)
{
NextToken(); // Skip :
ScriptNamedArgument namedArg = Open <ScriptNamedArgument>();
namedArg.Name = "group";
namedArg.Value = value;
Close(namedArg);
namedArg.Span = value.Span;
isFirst = false;
functionCall.Arguments.Add(namedArg);
continue;
}
if (arrayInit == null)
{
arrayInit = Open <ScriptArrayInitializerExpression>();
functionCall.Arguments.Insert(0, arrayInit);
arrayInit.Span.Start = value.Span.Start;
}
arrayInit.Values.Add(value);
arrayInit.Span.End = value.Span.End;
if (Current.Type == TokenType.Comma)
{
NextToken();
}
else if (Current.Type == TokenType.LiquidTagExit)
{
break;
}
else
{
LogError(Current, string.Format(RS.UnexpectedTokenAfterCycle, GetAsText(Current), value));
NextToken();
break;
}
}
Close(functionCall);
ExpectEndOfStatement(statement);
return(Close(statement));
}
/// <summary>
/// Evaluates the specified expression
/// </summary>
/// <param name="targetExpression">The expression to evaluate</param>
/// <param name="valueToSet">A value to set in case of a setter</param>
/// <param name="setter">true if this a setter</param>
/// <param name="level">The indirection level (0 before entering the expression)</param>
/// <returns>The value of the targetExpression</returns>
private object GetOrSetValue(ScriptExpression targetExpression, object valueToSet, bool setter, int level)
{
object value = null;
try
{
var nextVariable = targetExpression as ScriptVariable;
if (nextVariable != null)
{
if (setter)
{
SetValue(nextVariable, valueToSet, false);
}
else
{
value = GetValueFromVariable(nextVariable);
}
}
else
{
if (targetExpression is ScriptMemberExpression nextDot)
{
var targetObject = GetOrSetValue(nextDot.Target, valueToSet, false, level + 1);
if (targetObject == null)
{
throw new ScriptRuntimeException(nextDot.Span,
$"Object [{nextDot.Target}] is null. Cannot access member: {nextDot}"); // unit test: 131-member-accessor-error1.txt
}
if (targetObject is string || targetObject.GetType().GetTypeInfo().IsPrimitive)
{
throw new ScriptRuntimeException(nextDot.Span,
$"Cannot get or set a member on the primitive [{targetObject}/{targetObject.GetType()}] when accessing member: {nextDot}"); // unit test: 132-member-accessor-error2.txt
}
var accessor = GetMemberAccessor(targetObject);
var memberName = nextDot.Member.Name;
if (setter)
{
if (!accessor.TrySetValue(this, targetExpression.Span, targetObject, memberName, valueToSet))
{
throw new ScriptRuntimeException(nextDot.Member.Span,
$"Cannot set a value for the readonly member: {nextDot}"); // unit test: 132-member-accessor-error3.txt
}
}
else
{
if (!accessor.TryGetValue(this, targetExpression.Span, targetObject, memberName, out value))
{
TryGetMember?.Invoke(this, targetExpression.Span, targetObject, memberName, out value);
}
}
}
else
{
if (targetExpression is ScriptIndexerExpression nextIndexer)
{
var targetObject = GetOrSetValue(nextIndexer.Target, valueToSet, false, level + 1);
if (targetObject == null)
{
throw new ScriptRuntimeException(nextIndexer.Target.Span,
$"Object [{nextIndexer.Target}] is null. Cannot access indexer: {nextIndexer}"); // unit test: 130-indexer-accessor-error1.txt
}
else
{
var index = Evaluate(nextIndexer.Index);
if (index == null)
{
throw new ScriptRuntimeException(nextIndexer.Index.Span,
$"Cannot access target [{nextIndexer.Target}] with a null indexer: {nextIndexer}"); // unit test: 130-indexer-accessor-error2.txt
}
else
{
if (targetObject is IDictionary || targetObject is ScriptObject)
{
var accessor = GetMemberAccessor(targetObject);
var indexAsString =
ToString(nextIndexer.Index.Span, index);
if (setter)
{
if (!accessor.TrySetValue(this, targetExpression.Span, targetObject, indexAsString, valueToSet))
{
throw new ScriptRuntimeException(nextIndexer.Index.Span,
$"Cannot set a value for the readonly member [{indexAsString}] in the indexer: {nextIndexer.Target}['{indexAsString}']"); // unit test: 130-indexer-accessor-error3.txt
}
}
else
{
if (!accessor.TryGetValue(this, targetExpression.Span, targetObject, indexAsString, out value))
{
TryGetMember?.Invoke(this, targetExpression.Span, targetObject, indexAsString, out value);
}
}
}
else
{
var accessor = GetListAccessor(targetObject);
if (accessor == null)
{
throw new ScriptRuntimeException(nextIndexer.Target.Span, $"Expecting a list. Invalid value [{targetObject}/{targetObject.GetType().Name}] for the target [{nextIndexer.Target}] for the indexer: {nextIndexer}"); // unit test: 130-indexer-accessor-error4.txt
}
else
{
int i = ToInt(nextIndexer.Index.Span, index);
// Allow negative index from the end of the array
if (i < 0)
{
i = accessor.GetLength(this, targetExpression.Span, targetObject) + i;
}
if (i >= 0)
{
if (setter)
{
accessor.SetValue(this, targetExpression.Span, targetObject, i, valueToSet);
}
else
{
value = accessor.GetValue(this, targetExpression.Span, targetObject, i);
}
}
}
}
}
}
}
else if (!setter)
{
value = Evaluate(targetExpression);
}
else
{
throw new ScriptRuntimeException(targetExpression.Span,
$"Unsupported expression for target for assignment: {targetExpression} = ..."); // unit test: 105-assign-error1.txt
}
}
}
}
catch (Exception readonlyException) when(level == 0 && !(readonlyException is ScriptRuntimeException))
{
throw new ScriptRuntimeException(targetExpression.Span, $"Unexpected exception while accessing `{targetExpression}`", readonlyException);
}
// If the variable being returned is a function, we need to evaluate it
// If function call is disabled, it will be only when returning the final object (level 0 of recursion)
if ((!_isFunctionCallDisabled || level > 0) && ScriptFunctionCall.IsFunction(value))
{
value = ScriptFunctionCall.Call(this, targetExpression, value);
}
return(value);
}
public ScriptExpression ReplaceCondition(ScriptExpression condition, object replaceValue)
{
if (condition is ScriptVariableLocal localVar)
{
if (localVar.Name == string.Empty)
{
return(new ScriptLiteral(replaceValue));
}
else
{
return(localVar);
}
}
else if (condition is ScriptMemberExpression objExpr)
{
return(new ScriptMemberExpression()
{
Member = objExpr.Member,
Trivias = objExpr.Trivias,
Target = ReplaceCondition(objExpr.Target, replaceValue)
});
}
else if (condition is ScriptNestedExpression nestedExpr)
{
return(new ScriptNestedExpression()
{
Expression = ReplaceCondition(nestedExpr.Expression, replaceValue),
Trivias = nestedExpr.Trivias
});
}
else if (condition is ScriptFunctionCall funcCall)
{
ScriptFunctionCall funcResult = new ScriptFunctionCall()
{
Target = funcCall.Target,
Trivias = funcCall.Trivias
};
foreach (ScriptExpression expr in funcCall.Arguments)
{
funcResult.Arguments.Add(ReplaceCondition(expr, replaceValue));
}
return(funcResult);
}
else if (condition is ScriptPipeCall pipeCall)
{
ScriptPipeCall pipeResult = new ScriptPipeCall()
{
From = ReplaceCondition(pipeCall.From, replaceValue),
To = ReplaceCondition(pipeCall.To, replaceValue),
Trivias = pipeCall.Trivias
};
return(pipeResult);
}
else if (condition is ScriptBinaryExpression binCondition)
{
ScriptBinaryExpression binExprResult = new ScriptBinaryExpression()
{
Left = ReplaceCondition(binCondition.Left, replaceValue),
Right = ReplaceCondition(binCondition.Right, replaceValue),
Operator = binCondition.Operator,
Trivias = binCondition.Trivias
};
return(binExprResult);
}
else
{
return(condition);
}
}
