public static ExpressionNode Parse(HandlebarsParserState state, HandlebarsBlockStack blockStack, SourceLocation location, string expression, IMemberLocator memberLocator = null)
{
int recursionLevel = 0;
memberLocator = memberLocator ?? MemberLocator.Default;
expression = expression.Trim();
if (expression == "this")
{
return SyntaxTreeExpression.Self(blockStack.GetCurrentModelType(), location);
}
if (expression.StartsWith("../"))
{
var blockNode = blockStack.FirstNode();
while (expression.StartsWith("../"))
{
var parentBlockNode = blockStack.GetParentNode(blockNode);
if (parentBlockNode != null)
{
blockNode = parentBlockNode;
expression = expression.Substring(3);
location = location.MoveIndex(3);
}
recursionLevel++;
}
return ParseAgainstModel(blockStack.GetCurrentModelType(blockNode), expression, ExpressionScope.ModelOfParentScope, recursionLevel, memberLocator, location);
}
return ParseAgainstModel(blockStack.GetCurrentModelType(), expression, ExpressionScope.CurrentModelOnStack, recursionLevel, memberLocator, location);
}
private static ExpressionNode ParseAgainstModel(Type modelType, string expression, ExpressionScope expressionScope, int recursionLevel, IMemberLocator memberLocator, SourceLocation location)
{
var dotIndex = expression.IndexOf('.');
if (dotIndex >= 0)
{
var subModel = ParseAgainstModel(modelType, expression.Substring(0, dotIndex), expressionScope, recursionLevel, memberLocator, location.SetLength(dotIndex));
return SyntaxTreeExpression.SubModel(
subModel,
ParseAgainstModel(subModel.ResultType, expression.Substring(dotIndex + 1), ExpressionScope.CurrentModelOnStack, 0, memberLocator, location.MoveIndex(dotIndex + 1)),
location
);
}
if (expression.EndsWith("()"))
{
var func = memberLocator.FindMember(modelType, expression.Substring(0, expression.Length - 2), MemberTypes.Method);
if (func != null) return SyntaxTreeExpression.Function(modelType, func.Name, location, expressionScope);
}
var prop = memberLocator.FindMember(modelType, expression, MemberTypes.Property | MemberTypes.Field);
if (prop != null)
{
switch (prop.MemberType)
{
case MemberTypes.Property: return SyntaxTreeExpression.Property(modelType, prop.Name, location, expressionScope, recursionLevel);
case MemberTypes.Field: return SyntaxTreeExpression.Field(modelType, prop.Name, location, expressionScope, recursionLevel);
}
}
if (IsLateBoundAcceptingType(modelType))
return SyntaxTreeExpression.LateBound(expression, location, memberLocator, false, expressionScope, recursionLevel);
throw new VeilParserException(String.Format("Unable to parse model expression '{0}' againt model '{1}'", expression, modelType.Name), location);
}
private static ExpressionNode ParseAgainstModel(Type modelType, string expression, ExpressionScope expressionScope, IMemberLocator memberLocator, SourceLocation location)
{
var dotIndex = expression.IndexOf('.');
if (dotIndex >= 0)
{
var subModel = ParseAgainstModel(modelType, expression.Substring(0, dotIndex), expressionScope, memberLocator, location.SetLength(dotIndex));
return SyntaxTreeExpression.SubModel(
subModel,
ParseAgainstModel(subModel.ResultType, expression.Substring(dotIndex + 1), ExpressionScope.CurrentModelOnStack, memberLocator, location.MoveIndex(dotIndex + 1)),
location
);
}
if (expression.EndsWith("()"))
{
var func = memberLocator.FindMethod(modelType, expression.Substring(0, expression.Length - 2));
if (func != null) return SyntaxTreeExpression.Function(modelType, func.Name, location, expressionScope);
}
var prop = memberLocator.FindProperty(modelType, expression);
if (prop != null)
return SyntaxTreeExpression.Property(modelType, prop.Name, location, expressionScope);
var field = memberLocator.FindField(modelType, expression);
if (field != null)
return SyntaxTreeExpression.Field(modelType, field.Name, location, expressionScope);
if (IsLateBoundAcceptingType(modelType))
return SyntaxTreeExpression.LateBound(expression, location, memberLocator, false, expressionScope);
throw new VeilParserException(
$"Unable to parse model expression '{expression}' againt model '{modelType.Name}'", location);
}
/// <summary>
/// Write a string literal to the TextWriter
/// </summary>
/// <param name="content">The string to be written</param>
public static WriteLiteralNode WriteString(string content, SourceLocation location)
{
return new WriteLiteralNode
{
Location = location,
LiteralContent = content
};
}
public void WriteLiteral(string s, SourceLocation location)
{
if (TrimNextLiteral)
{
s = s.TrimStart();
TrimNextLiteral = false;
}
AddNodeToCurrentBlock(SyntaxTree.WriteString(s, location));
}
/// <summary>
/// Evaluate a field on the model object
/// </summary>
/// <param name="modelType">The type of the scoped model</param>
/// <param name="fieldName">The name of the field</param>
/// <param name="scope">The scope this expression evaluated in</param>
public static FieldExpressionNode Field(Type modelType, string fieldName, SourceLocation location, ExpressionScope scope = ExpressionScope.CurrentModelOnStack)
{
return new FieldExpressionNode
{
Location = location,
FieldInfo = modelType.GetField(fieldName),
Scope = scope
};
}
/// <summary>
/// Evaluate a property on the model object
/// </summary>
/// <param name="modelType">The type of the scoped model</param>
/// <param name="propertyName">The name of the property</param>
/// <param name="scope">The scope this expression evaluated in</param>
public static PropertyExpressionNode Property(Type modelType, string propertyName, SourceLocation location, ExpressionScope scope = ExpressionScope.CurrentModelOnStack)
{
return new PropertyExpressionNode
{
Location = location,
PropertyInfo = modelType.GetProperty(propertyName),
Scope = scope
};
}
/// <summary>
/// Evaluate a function call on the model
/// </summary>
/// <param name="modelType">The type of the scoped model</param>
/// <param name="functionName">The name of the function</param>
/// <param name="scope">The scope this expression evaluated in</param>
public static FunctionCallExpressionNode Function(Type modelType, string functionName, SourceLocation location, ExpressionScope scope = ExpressionScope.CurrentModelOnStack)
{
return new FunctionCallExpressionNode
{
Location = location,
MethodInfo = modelType.GetMethod(functionName, new Type[0]),
Scope = scope
};
}
/// <summary>
/// Evaluate the model itself e.g. Value types
/// </summary>
/// <param name="modelType">The type of the scoped model</param>
/// <param name="scope">The scope this expression evaluated in</param>
public static SelfExpressionNode Self(Type modelType, SourceLocation location, ExpressionScope scope = ExpressionScope.CurrentModelOnStack)
{
return new SelfExpressionNode
{
Location = location,
ModelType = modelType,
Scope = scope
};
}
/// <summary>
/// Evaluate an expression and write the value to the TextWriter
/// </summary>
/// <param name="expression">The expression to be written</param>
/// <param name="htmlEncode">Indicates whether the content should be html encoded before being written</param>
public static WriteExpressionNode WriteExpression(ExpressionNode expression, SourceLocation location, bool htmlEncode = false)
{
return new WriteExpressionNode
{
Location = location,
Expression = expression,
HtmlEncode = htmlEncode
};
}
/// <summary>
/// Create a sequential block of nodes
/// </summary>
public static BlockNode Block(SourceLocation location, params SyntaxTreeNode[] nodes)
{
var block = new BlockNode
{
Location = location
};
block.AddRange(nodes);
return block;
}
/// <summary>
/// Evaluate an expression on a sub model, can be nested to traverse any depth of sub models
/// </summary>
/// <param name="modelExpression">An expression referencing the model to traverse to</param>
/// <param name="subModelExpression">An expression to evaluate in the scope of the model that has been traversed to</param>
/// <param name="scope">The scope this expression evaluated in</param>
public static SubModelExpressionNode SubModel(ExpressionNode modelExpression, ExpressionNode subModelExpression, SourceLocation location, ExpressionScope scope = ExpressionScope.CurrentModelOnStack)
{
return new SubModelExpressionNode
{
Location = location,
ModelExpression = modelExpression,
SubModelExpression = subModelExpression,
Scope = scope
};
}
/// <summary>
/// Evaluates an expression and chooses between two blocks based on the truthy-ness of the result
/// </summary>
/// <param name="expression">The expression to evaluate</param>
/// <param name="trueBlock">The block to execute when the expression is true</param>
/// <param name="falseBlock">The block to evaluate when the expression is false</param>
/// <returns></returns>
public static ConditionalNode Conditional(ExpressionNode expression, SourceLocation location, BlockNode trueBlock, BlockNode falseBlock = null)
{
return new ConditionalNode
{
Location = location,
Expression = expression,
TrueBlock = trueBlock,
FalseBlock = falseBlock
};
}
/// <summary>
/// Iterate a collection and execute the body block scoped to each item in the collection.
/// Optionally execute an empty block when there are no items to iterate
/// </summary>
/// <param name="collectionExpression">expression to load the collection</param>
/// <param name="body">Block to execute in the scope of each item</param>
/// <param name="emptyBody">Block to execute when there are no items in the collection</param>
public static IterateNode Iterate(ExpressionNode collectionExpression, SourceLocation location, BlockNode body, BlockNode emptyBody = null)
{
return new IterateNode
{
Location = location,
Collection = collectionExpression,
Body = body,
EmptyBody = emptyBody ?? SyntaxTree.Block(location)
};
}
protected async Task GetErrorPage(StreamWriter writer, Exception error, SourceLocation location)
{
var fileSystem = new EmbeddedResourceFileSystem(typeof(WebInitializer).Assembly);
string content;
using (var reader = new StreamReader(fileSystem.OpenRead(PathInfo.Create("Core/error_partial.html"))))
{
content = await reader.ReadToEndAsync();
}
var templateInfo = new StringTemplateInfo("error", content);
var view = await ((IViewEngine)Resolver.GetService(typeof(IViewEngine)))
.CreateViewAsync(templateInfo, typeof(ErrorViewModel)).ConfigureAwait(false);
if (location == null)
{
var modelWithoutLocation = new ErrorViewModel
{
ErrorMessage = error.Message,
Details = error.StackTrace
};
view.Render(modelWithoutLocation, new RenderingContext(writer));
return;
}
var templateRepository = (ITemplateRepository)this.Resolver.GetService(typeof(ITemplateRepository));
var sourceTemplate = await templateRepository.GetTemplateAsync(location.TemplateId).ConfigureAwait(false);
string sourceTemplateSource;
using (var reader = new StreamReader(sourceTemplate.Open()))
{
sourceTemplateSource = await reader.ReadToEndAsync().ConfigureAwait(false);
}
var model = new ErrorViewModel
{
TemplateId = location.TemplateId,
ErrorMessage = error.Message,
Details = error.StackTrace,
Before = sourceTemplateSource.Substring(0, location.Index),
Node = sourceTemplateSource.Substring(location.Index, location.Length),
After = sourceTemplateSource.Substring(location.Index + location.Length),
Text = HttpUtility.JavaScriptStringEncode(sourceTemplateSource),
Range = GetRange(sourceTemplateSource, location)
};
view.Render(model, new RenderingContext(writer));
}
public static ExpressionNode Parse(HandlebarsParserState state, HandlebarsBlockStack blockStack, SourceLocation location, string expression, IMemberLocator memberLocator = null)
{
memberLocator = memberLocator ?? MemberLocator.Default;
expression = expression.Trim();
if (expression == "this")
{
return SyntaxTreeExpression.Self(blockStack.GetCurrentModelType(), location, ExpressionScope.CurrentModelOnStack);
}
if (expression.StartsWith("../"))
{
return ParseAgainstModel(blockStack.GetParentModelType(), expression.Substring(3), ExpressionScope.ModelOfParentScope, memberLocator, location.MoveIndex(3));
}
return ParseAgainstModel(blockStack.GetCurrentModelType(), expression, ExpressionScope.CurrentModelOnStack, memberLocator, location);
}
private static void AssertLocation(string input, string templateId, SourceLocation location, string enclosedText, int index)
{
Assert.Equal(enclosedText, input.Substring(location.Index, location.Length));
Assert.Equal(index, location.Index);
Assert.Equal(enclosedText.Length, location.Length);
Assert.Equal(templateId, location.TemplateId);
}
/// <summary>
/// Execute another template in the scope of the provided model
/// </summary>
/// <param name="templateName">The name of the template to execute. It will be loaded from the <see cref="IVeilContext"/></param>
/// <param name="modelExpression">An expression for the model to be used as the root scope when executing the template</param>
public static IncludeTemplateNode Include(string templateName, ExpressionNode modelExpression, SourceLocation location)
{
return new IncludeTemplateNode
{
Location = location,
ModelExpression = modelExpression,
TemplateName = templateName
};
}
/// <summary>
/// Evaluate whether the collectionExpression has Count > 0
/// Can only be used on types that implement <see cref="System.Collections.ICollection"/>
/// </summary>
/// <param name="collectionExpression">An expression referencing a Collection</param>
/// <param name="location"></param>
/// <param name="recursionLevel"></param>
public static CollectionHasItemsExpressionNode HasItems(ExpressionNode collectionExpression, SourceLocation location, int recursionLevel = 0)
{
return new CollectionHasItemsExpressionNode
{
Location = location,
CollectionExpression = collectionExpression,
Scope = collectionExpression.Scope,
RecursionLevel = recursionLevel
};
}
/// <summary>
/// Create an exception with the supplied message
/// </summary>
public VeilParserException(string message, SourceLocation location)
: base(message)
{
Location = location;
}
/// <summary>
/// Evaluate whether the collectionExpression has Count > 0
/// Can only be used on types that implement <see cref="System.Collections.ICollection"/>
/// </summary>
/// <param name="collectionExpression">An expression referencing a Collection</param>
/// <param name="location"></param>
/// <param name="recursionLevel"></param>
public static CollectionHasItemsExpressionNode HasItems(ExpressionNode collectionExpression, SourceLocation location, int recursionLevel = 0)
{
return(new CollectionHasItemsExpressionNode
{
Location = location,
CollectionExpression = collectionExpression,
Scope = collectionExpression.Scope,
RecursionLevel = recursionLevel
});
}
public static HelperExpressionNode Helper(string expression, IHelperHandler helperHandler, SourceLocation location)
{
var parts = expression.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
return(Helper(parts, helperHandler, location));
}
/// <summary>
/// Evaluate an expression on a sub model, can be nested to traverse any depth of sub models
/// </summary>
/// <param name="modelExpression">An expression referencing the model to traverse to</param>
/// <param name="subModelExpression">An expression to evaluate in the scope of the model that has been traversed to</param>
/// <param name="location"></param>
/// <param name="scope">The scope this expression evaluated in</param>
public static SubModelExpressionNode SubModel(ExpressionNode modelExpression, ExpressionNode subModelExpression, SourceLocation location, ExpressionScope scope = ExpressionScope.CurrentModelOnStack)
{
return(new SubModelExpressionNode
{
Location = location,
ModelExpression = modelExpression,
SubModelExpression = subModelExpression,
Scope = scope
});
}
public static HelperExpressionNode Helper(string expression, IHelperHandler helperHandler, SourceLocation location)
{
var parts = expression.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
return Helper(parts, helperHandler, location);
}
/// <summary>
/// Evaluate a property at runtime against an unknown model type
/// </summary>
/// <param name="itemName">The name of the proeprty that will be searched for</param>
/// <param name="isCaseSenstiive">Indcates whether the expression should be evaluated with case sensitivity</param>
/// <param name="scope">The scope this expression evaluated in</param>
public static LateBoundExpressionNode LateBound(string itemName, SourceLocation location, IMemberLocator memberLocator = null, bool isCaseSenstiive = true, ExpressionScope scope = ExpressionScope.CurrentModelOnStack)
{
return new LateBoundExpressionNode
{
Location = location,
MemberLocator = memberLocator ?? MemberLocator.Default,
ItemName = itemName,
Scope = scope
};
}
public static HelperExpressionNode Helper(string[] parameter, IHelperHandler helperHandler, SourceLocation location)
{
var data = new Dictionary <string, string>();
if (parameter.Length > 1)
{
foreach (var value in parameter.Skip(1))
{
var tmp = value.Split(new[] { '=' }, 2);
data.Add(tmp[0], tmp.Length == 2 ? tmp[1] : string.Empty);
}
}
return(new HelperExpressionNode
{
Location = location,
Name = parameter[0],
Parameters = data,
HelperHandler = helperHandler
});
}
/// <summary>
/// Scopes a node to a new model
/// </summary>
/// <param name="modelToScopeTo">An expression that evaluates to the model to scope to</param>
/// <param name="node">The node to execute in the new scope</param>
public static ScopedNode ScopeNode(ExpressionNode modelToScopeTo, SyntaxTreeNode node, SourceLocation location)
{
return new ScopedNode
{
Location = location,
ModelToScope = modelToScopeTo,
Node = node
};
}
/// <summary>
/// Evaluate a function call on the model
/// </summary>
/// <param name="modelType">The type of the scoped model</param>
/// <param name="functionName">The name of the function</param>
/// <param name="location"></param>
/// <param name="scope">The scope this expression evaluated in</param>
public static FunctionCallExpressionNode Function(Type modelType, string functionName, SourceLocation location, ExpressionScope scope = ExpressionScope.CurrentModelOnStack)
{
return(new FunctionCallExpressionNode
{
Location = location,
MethodInfo = modelType.GetMethod(functionName, new Type[0]),
Scope = scope
});
}
private static ErrorRange GetRange(string sourceTemplateSource, SourceLocation location)
{
int lineNumber = 0;
int idx = 0;
int lastIdx = 0;
while ((idx = sourceTemplateSource.IndexOf('\n', idx)) >= 0 && idx < location.Index)
{
lineNumber++;
idx++;
lastIdx = idx;
}
int startLineNumber = lineNumber;
int startIdx = lastIdx;
while ((idx = sourceTemplateSource.IndexOf('\n', idx)) >= 0 && idx < location.Index + location.Length)
{
lineNumber++;
idx++;
lastIdx = idx;
}
return new ErrorRange
{
StartRow = startLineNumber,
StartColumn = location.Index - startIdx,
EndRow = lineNumber,
EndColumn = location.Index - lastIdx + location.Length
};
}
public static HelperExpressionNode Helper(string[] parameter, IHelperHandler helperHandler, SourceLocation location)
{
var data = new Dictionary<string, string>();
if (parameter.Length > 1)
{
foreach (var value in parameter.Skip(1))
{
var tmp = value.Split(new[] {'='}, 2);
data.Add(tmp[0], tmp.Length == 2 ? tmp[1] : string.Empty);
}
}
return new HelperExpressionNode
{
Location = location,
Name = parameter[0],
Parameters = data,
HelperHandler = helperHandler
};
}
/// <summary>
/// Defines an optional point in a template that can be overridden when the template is extended.
/// If the point is not overridden then the specified content is used by default
/// </summary>
/// <param name="overrideName">The name of the override which must match that specified in the overriding template</param>
/// <param name="defaultContent">The content to use when the point is not overridden</param>
public static OverridePointNode Override(string overrideName, SyntaxTreeNode defaultContent, SourceLocation location)
{
return new OverridePointNode
{
Location = location,
OverrideName = overrideName,
IsRequired = false,
DefaultContent = defaultContent
};
}
/// <summary>
/// Evaluate a property on the model object
/// </summary>
/// <param name="modelType">The type of the scoped model</param>
/// <param name="propertyName">The name of the property</param>
/// <param name="location"></param>
/// <param name="scope">The scope this expression evaluated in</param>
/// <param name="recursionLevel"></param>
public static PropertyExpressionNode Property(Type modelType, string propertyName, SourceLocation location, ExpressionScope scope = ExpressionScope.CurrentModelOnStack, int recursionLevel = 0)
{
return(new PropertyExpressionNode
{
Location = location,
PropertyInfo = modelType.GetProperty(propertyName),
Scope = scope,
RecursionLevel = recursionLevel
});
}
/// <summary>
/// Flushes the TextWriter.
/// Used to optimize responses in web applications.
/// </summary>
public static FlushNode Flush(SourceLocation location)
{
return new FlushNode
{
Location = location
};
}
public ExpressionNode ParseExpression(string expression, SourceLocation location)
{
return HandlebarsExpressionParser.Parse(this, BlockStack, location, expression, _memberLocator);
}
/// <summary>
/// Evaluate whether the collectionExpression has Count > 0
/// Can only be used on types that implement <see cref="System.Collections.ICollection"/>
/// </summary>
/// <param name="collectionExpression">An expression referencing a Collection</param>
public static CollectionHasItemsExpressionNode HasItems(ExpressionNode collectionExpression, SourceLocation location)
{
return new CollectionHasItemsExpressionNode
{
Location = location,
CollectionExpression = collectionExpression,
Scope = collectionExpression.Scope
};
}
public static SyntaxTreeNode Helper(HelperExpressionNode helperExpression, BlockNode block, SourceLocation location)
{
return new HelperBlockNode
{
Location = location,
HelperExpression = helperExpression,
Block = block
};
}