/// <summary>
/// Add text as lg file content to template engine. A fullpath id is needed when importResolver is empty, or simply pass in customized importResolver.
/// </summary>
/// <param name="content">Text content contains lg templates.</param>
/// <param name="id">id is the content identifier. If importResolver is null, id must be a full path string. </param>
/// <param name="importResolver">resolver to resolve LG import id to template text.</param>
/// <returns>Template engine with the parsed content.</returns>
public TemplateEngine AddText(string content, string id = "", ImportResolverDelegate importResolver = null)
{
CheckImportResolver(id, importResolver);
var rootResource = LGParser.Parse(content, id);
var lgresources = rootResource.DiscoverDependencies(importResolver);
Templates.AddRange(lgresources.SelectMany(x => x.Templates));
RunStaticCheck(Templates);
return(this);
}
/// <summary>
/// Add a new template and return LG resource.
/// </summary>
/// <param name="templateName">new template name.</param>
/// <param name="parameters">new params.</param>
/// <param name="templateBody">new template body.</param>
/// <returns>new lg resource.</returns>
public LGResource AddTemplate(string templateName, List <string> parameters, string templateBody)
{
var template = Templates.FirstOrDefault(u => u.Name == templateName);
if (template != null)
{
throw new Exception($"template {templateName} already exists.");
}
var templateNameLine = BuildTemplateNameLine(templateName, parameters);
var newTemplateBody = ConvertTemplateBody(templateBody);
var newContent = $"{Content}\r\n{templateNameLine}\r\n{newTemplateBody}";
return(LGParser.Parse(newContent, Id));
}
/// <summary>
/// Delete an exist template.
/// </summary>
/// <param name="templateName">which template should delete.</param>
/// <returns>return the new lg resource.</returns>
public LGResource DeleteTemplate(string templateName)
{
var template = Templates.FirstOrDefault(u => u.Name == templateName);
if (template == null)
{
return(this);
}
var startLine = template.ParseTree.Start.Line - 1;
var stopLine = template.ParseTree.Stop.Line - 1;
var newContent = ReplaceRangeContent(Content, startLine, stopLine, null);
return(LGParser.Parse(newContent, Id));
}
/// <summary>
/// Use to evaluate an inline template str.
/// </summary>
/// <param name="inlineStr">inline string which will be evaluated.</param>
/// <param name="scope">scope object or JToken.</param>
/// <returns>Evaluate result.</returns>
public object Evaluate(string inlineStr, object scope = null)
{
// wrap inline string with "# name and -" to align the evaluation process
var fakeTemplateId = "__temp__";
inlineStr = !inlineStr.Trim().StartsWith("```") && inlineStr.IndexOf('\n') >= 0
? "```" + inlineStr + "```" : inlineStr;
var wrappedStr = $"# {fakeTemplateId} \r\n - {inlineStr}";
var lgsource = LGParser.Parse(wrappedStr, "inline");
var templates = Templates.Concat(lgsource.Templates).ToList();
RunStaticCheck(templates);
var evaluator = new Evaluator(templates, this.expressionEngine);
return(evaluator.EvaluateTemplate(fakeTemplateId, scope));
}
/// <summary>
/// update an exist template.
/// </summary>
/// <param name="templateName">origin template name. the only id of a template.</param>
/// <param name="parameters">new params.</param>
/// <param name="templateBody">new template body.</param>
/// <returns>new LG resource.</returns>
public LGResource UpdateTemplate(string templateName, List <string> parameters, string templateBody)
{
var template = Templates.FirstOrDefault(u => u.Name == templateName);
if (template == null)
{
return(this);
}
var templateNameLine = BuildTemplateNameLine(templateName, parameters);
var newTemplateBody = ConvertTemplateBody(templateBody);
var content = $"{templateNameLine}\r\n{newTemplateBody}";
var startLine = template.ParseTree.Start.Line - 1;
var stopLine = template.ParseTree.Stop.Line - 1;
var newContent = ReplaceRangeContent(Content, startLine, stopLine, content);
return(LGParser.Parse(newContent, Id));
}
/// <summary>
/// Load .lg files into template engine
/// You can add one file, or mutlple file as once
/// If you have multiple files referencing each other, make sure you add them all at once,
/// otherwise static checking won't allow you to add it one by one.
/// </summary>
/// <param name="filePaths">Paths to .lg files.</param>
/// <param name="importResolver">resolver to resolve LG import id to template text.</param>
/// <returns>Teamplate engine with parsed files.</returns>
public TemplateEngine AddFiles(IEnumerable <string> filePaths, ImportResolverDelegate importResolver = null)
{
var totalLGResources = new List <LGResource>();
foreach (var filePath in filePaths)
{
var fullPath = Path.GetFullPath(ImportResolver.NormalizePath(filePath));
var rootResource = LGParser.Parse(File.ReadAllText(fullPath), fullPath);
var lgresources = rootResource.DiscoverDependencies(importResolver);
totalLGResources.AddRange(lgresources);
}
// Remove duplicated lg files by id
var deduplicatedLGResources = totalLGResources.GroupBy(x => x.Id).Select(x => x.First()).ToList();
Templates.AddRange(deduplicatedLGResources.SelectMany(x => x.Templates));
RunStaticCheck(Templates);
return(this);
}
public List <Diagnostic> CheckFiles(IEnumerable <string> filePaths, ImportResolverDelegate importResolver = null)
{
var result = new List <Diagnostic>();
var templates = new List <LGTemplate>();
var isParseSuccess = true;
try
{
var totalLGResources = new List <LGResource>();
foreach (var filePath in filePaths)
{
// do not use ??=, it will cause issue in the C# < 8.0
importResolver = importResolver ?? ImportResolver.FileResolver;
var fullPath = Path.GetFullPath(ImportResolver.NormalizePath(filePath));
var rootResource = LGParser.Parse(File.ReadAllText(fullPath), fullPath);
var resources = rootResource.DiscoverDependencies(importResolver);
totalLGResources.AddRange(resources);
}
var deduplicatedLGResources = totalLGResources.GroupBy(x => x.Id).Select(x => x.First()).ToList();
templates = deduplicatedLGResources.SelectMany(x => x.Templates).ToList();
}
catch (LGException ex)
{
result.AddRange(ex.Diagnostics);
isParseSuccess = false;
}
catch (Exception err)
{
result.Add(new Diagnostic(new Range(new Position(0, 0), new Position(0, 0)), err.Message));
isParseSuccess = false;
}
if (isParseSuccess)
{
result.AddRange(CheckTemplates(templates));
}
return(result);
}
public List <Diagnostic> CheckText(string content, string id = "", ImportResolverDelegate importResolver = null)
{
if (importResolver == null)
{
var importPath = ImportResolver.NormalizePath(id);
if (!Path.IsPathRooted(importPath))
{
throw new Exception("[Error] id must be full path when importResolver is null");
}
}
var result = new List <Diagnostic>();
var templates = new List <LGTemplate>();
var isParseSuccess = true;
try
{
var rootResource = LGParser.Parse(content, id);
var resources = rootResource.DiscoverDependencies(importResolver);
templates = resources.SelectMany(x => x.Templates).ToList();
}
catch (LGException ex)
{
result.AddRange(ex.Diagnostics);
isParseSuccess = false;
}
catch (Exception err)
{
result.Add(new Diagnostic(new Range(new Position(0, 0), new Position(0, 0)), err.Message));
isParseSuccess = false;
}
if (isParseSuccess)
{
result.AddRange(CheckTemplates(templates));
}
return(result);
}
/// <summary>
/// Resolve imported LG resources from a start resource.
/// All the imports will be visited and resolved to LGResouce list.
/// </summary>
/// <param name="start">The lg resource from which to start resolving imported resources.</param>
/// <param name="importResolver">resolver to resolve LG import id to template text.</param>
/// <param name="resourcesFound">Resources that have been found.</param>
private void ResolveImportResources(LGResource start, ImportResolverDelegate importResolver, HashSet <LGResource> resourcesFound)
{
var resourceIds = start.Imports.Select(lg => lg.Id).ToList();
resourcesFound.Add(start);
foreach (var id in resourceIds)
{
try
{
var(content, path) = importResolver(start.Id, id);
var childResource = LGParser.Parse(content, path);
if (!resourcesFound.Contains(childResource))
{
ResolveImportResources(childResource, importResolver, resourcesFound);
}
}
catch (Exception err)
{
throw new Exception($"[Error]{id}:{err.Message}", err);
}
}
}