/
RenderContext.cs
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/
RenderContext.cs
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using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Text.RegularExpressions;
using System.Xml;
namespace Nustache.Core
{
public delegate Template TemplateLocator(string name);
public delegate TResult Lambda<TResult>();
public delegate TResult Lambda<T, TResult>(T arg);
public delegate string RenderFunc(RenderContext context);
public class RenderContext
{
private const int IncludeLimit = 1024;
private readonly Stack<Section> _sectionStack = new Stack<Section>();
private readonly Stack<object> _dataStack = new Stack<object>();
private readonly TextWriter _writer;
private readonly TemplateLocator _templateLocator;
private readonly RenderContextBehaviour _renderContextBehaviour;
private int _includeLevel;
private string _indent;
private bool _lineEnded;
private readonly Regex _indenter = new Regex("\n(?!$)");
public string ActiveStartDelimiter { get; set; }
public string ActiveEndDelimiter { get; set; }
public RenderContext(Section section, object data, TextWriter writer, TemplateLocator templateLocator, RenderContextBehaviour renderContextBehaviour = null)
{
_sectionStack.Push(section);
_dataStack.Push(data);
_writer = writer;
_templateLocator = templateLocator;
_includeLevel = 0;
_renderContextBehaviour = renderContextBehaviour ??
RenderContextBehaviour.GetDefaultRenderContextBehaviour();
}
public RenderContext(RenderContext baseContext, TextWriter writer)
{
_sectionStack = baseContext._sectionStack;
_dataStack = baseContext._dataStack;
_writer = writer;
_templateLocator = baseContext._templateLocator;
_renderContextBehaviour = baseContext._renderContextBehaviour;
_includeLevel = baseContext._includeLevel;
_indent = baseContext._indent;
_lineEnded = baseContext._lineEnded;
}
public object GetValue(string path)
{
if (path == ".")
{
object peekedObject = _dataStack.Peek();
if (peekedObject as XmlElement != null)
{
return ((XmlElement)peekedObject).InnerText;
}
return peekedObject;
}
foreach (var data in _dataStack)
{
if (data != null)
{
bool partialMatch;
var value = GetValueFromPath(data, path, out partialMatch);
if (partialMatch) break;
if (!ReferenceEquals(value, ValueGetter.NoValue))
{
if (value is string)
{
var valueAsString = (string)value;
if (string.IsNullOrEmpty(valueAsString) && _renderContextBehaviour.RaiseExceptionOnEmptyStringValue)
{
throw new NustacheEmptyStringException(
string.Format("Path : {0} is an empty string, RaiseExceptionOnEmptyStringValue : true.", path));
}
}
return value;
}
}
}
string name;
IList<object> arguments;
IDictionary<string, object> options;
Helpers.Parse(this, path, out name, out arguments, out options);
if (Helpers.Contains(name))
{
var helper = Helpers.Get(name);
return (HelperProxy)((fn, inverse) => helper(this, arguments, options, fn, inverse));
}
if (_renderContextBehaviour.RaiseExceptionOnDataContextMiss)
{
throw new NustacheDataContextMissException(string.Format("Path : {0} is undefined, RaiseExceptionOnDataContextMiss : true.", path));
}
return null;
}
private static object GetValueFromPath(object data, string path, out bool partialMatch)
{
partialMatch = false;
var value = ValueGetter.GetValue(data, path);
if (value != null && !ReferenceEquals(value, ValueGetter.NoValue))
{
return value;
}
var names = path.Split('.');
if (names.Length > 1)
{
for (int i = 0; i < names.Length; i++ )
{
data = ValueGetter.GetValue(data, names[i]);
if (data == null || ReferenceEquals(data, ValueGetter.NoValue))
{
if (i > 0)
{
partialMatch = true;
}
break;
}
}
return data;
}
return value;
}
public IEnumerable<object> GetValues(string path)
{
object value = GetValue(path);
if (value == null)
{
if (_renderContextBehaviour.RaiseExceptionOnDataContextMiss)
{
throw new NustacheDataContextMissException(string.Format("Path : {0} is undefined, RaiseExceptionOnDataContextMiss : true.", path));
}
yield break;
}
else if (value is bool)
{
if ((bool)value)
{
yield return value;
}
}
else if (value is string)
{
if (!string.IsNullOrEmpty((string)value))
{
yield return value;
}
}
else if (value.GetType().ToString().Equals("Newtonsoft.Json.Linq.JValue"))
{
yield return value;
}
else if (GenericIDictionaryUtil.IsInstanceOfGenericIDictionary(value))
{
if ((value as IEnumerable).GetEnumerator().MoveNext())
{
yield return value;
}
}
else if (value is IDictionary) // Dictionaries also implement IEnumerable
// so this has to be checked before it.
{
if (((IDictionary)value).Count > 0)
{
yield return value;
}
}
else if (value is IEnumerable)
{
foreach (var item in ((IEnumerable)value))
{
yield return item;
}
}
else if (value is DataTable)
{
foreach (var item in ((DataTable)value).Rows)
{
yield return item;
}
}
else
{
yield return value;
}
}
public bool IsTruthy(string path)
{
return IsTruthy(GetValue(path));
}
public bool IsTruthy(object value)
{
if (value == null)
{
return false;
}
if (value is bool)
{
return (bool)value;
}
if (value is string)
{
return !string.IsNullOrEmpty((string)value);
}
if (value is IEnumerable)
{
return ((IEnumerable)value).GetEnumerator().MoveNext();
}
if (value is DataTable)
{
return ((DataTable)value).Rows.Count > 0;
}
return true;
}
public void WriteLiteral(string text)
{
if (_indent != null)
{
text = _indenter.Replace(text, m => "\n" + _indent);
}
Write(text);
_lineEnded = text.Length > 0 && text[text.Length - 1] == '\n';
}
public void Write(string text)
{
// Sometimes a literal gets cut in half by a variable and needs to be indented.
if (_indent != null && _lineEnded)
{
text = _indent + text;
_lineEnded = false;
}
_writer.Write(text);
}
public void Include(string templateName, string indent)
{
if (_includeLevel >= IncludeLimit)
{
throw new NustacheException(
string.Format("You have reached the include limit of {0}. Are you trying to render infinitely recursive templates or data?", IncludeLimit));
}
_includeLevel++;
var oldIndent = _indent;
_indent = (_indent ?? "") + (indent ?? "");
TemplateDefinition templateDefinition = GetTemplateDefinition(templateName);
if (templateDefinition != null)
{
templateDefinition.Render(this);
}
else if (_templateLocator != null)
{
var template = _templateLocator(templateName);
if (template != null)
{
// push the included template on the stack so that internally defined templates can be resolved properly later.
// designed to pass test Describe_Template_Render.It_can_include_templates_over_three_levels_with_external_includes()
this.Enter(template);
template.Render(this);
this.Exit();
}
}
_indent = oldIndent;
_includeLevel--;
}
private TemplateDefinition GetTemplateDefinition(string name)
{
foreach (var section in _sectionStack)
{
var templateDefinition = section.GetTemplateDefinition(name);
if (templateDefinition != null)
{
return templateDefinition;
}
}
return null;
}
public void Enter(Section section)
{
_sectionStack.Push(section);
}
public void Exit()
{
_sectionStack.Pop();
}
public void Push(object data)
{
_dataStack.Push(data);
}
public void Pop()
{
_dataStack.Pop();
}
}
}