/// <summary>
/// Processes @require directives.
///
/// @require directives indicate that a script uses functionality provided by a specified.net
/// package in Jist marked with the JavascriptProvides attributre. If Jist is run without that
/// package support, the script will not run.
/// </summary>
protected void PreprocessRequires(ref JistScript script)
{
if (script == null || string.IsNullOrEmpty(script.Script) == true ||
PreprocessorDirectives.requiresRegex.IsMatch(script.Script) == false)
{
return;
}
foreach (Match match in PreprocessorDirectives.requiresRegex.Matches(script.Script))
{
string[] packages = match.Groups[2].Value.Split(',');
foreach (string package in packages)
{
string trimmedPackage = package.Trim().Replace("\"", "");
if (string.IsNullOrEmpty(trimmedPackage) == true)
{
return;
}
script.PackageRequirements.Add(trimmedPackage);
script.Script = script.Script.Replace(match.Value, string.Format("/** #pragma require \"{0}\" - DO NOT CHANGE THIS LINE **/\r\n", trimmedPackage));
}
}
}
/// <summary>
/// Removes comments from a scripts content.
/// </summary>
protected void PreprocessComments(ref JistScript script)
{
if (script == null || string.IsNullOrEmpty(script.Script) == true) {
return;
}
PreprocessorDirectives.multilineCommentRegex.Replace(script.Script, blankEvaluator);
PreprocessorDirectives.singleLineCommentRegex.Replace(script.Script, blankEvaluator);
}
/// <summary>
/// Removes comments from a scripts content.
/// </summary>
protected void PreprocessComments(ref JistScript script)
{
if (script == null || string.IsNullOrEmpty(script.Script) == true)
{
return;
}
PreprocessorDirectives.multilineCommentRegex.Replace(script.Script, blankEvaluator);
PreprocessorDirectives.singleLineCommentRegex.Replace(script.Script, blankEvaluator);
}
public void PreprocessScript(JistScript script)
{
if (script == null || string.IsNullOrEmpty(script.Script) == true) {
return;
}
PreprocessComments(ref script);
PreprocessRequires(ref script);
PreprocessImports(ref script);
PreprocessInlines(ref script);
}
public void PreprocessScript(JistScript script)
{
if (script == null || string.IsNullOrEmpty(script.Script) == true)
{
return;
}
PreprocessComments(ref script);
PreprocessRequires(ref script);
PreprocessImports(ref script);
PreprocessInlines(ref script);
}
protected void PreprocessInlines(ref JistScript script)
{
//@inline: inline imports script content into another script.
if (PreprocessorDirectives.inlineRegex.IsMatch(script.Script)) {
foreach (Match match in PreprocessorDirectives.inlineRegex.Matches(script.Script)) {
string scriptLocation = match.Groups[1].Value;
//prevent cyclic references
if (!scriptLocation.Equals(script.FilePathOrUri)) {
JistScript inlineContent = jistParent.LoadScript(scriptLocation, false);
script.Script = script.Script.Replace(match.Value, "");
script.Script = script.Script.Insert(match.Index, string.Format("/** #pragma inline \"{0}\" **/\r\n{1}", scriptLocation, inlineContent.Script));
}
}
}
}
protected void PreprocessImports(ref JistScript script)
{
//@import: tells the preprocessor to import the script into the engine, and load it.
if (PreprocessorDirectives.importRegex.IsMatch(script.Script)) {
foreach (Match match in PreprocessorDirectives.importRegex.Matches(script.Script)) {
string scriptLocation = match.Groups[1].Value;
//prevent cyclic references
if (!scriptLocation.Equals(script.FilePathOrUri)) {
jistParent.LoadScript(scriptLocation);
string importedValue = string.Format("/** #pragma import \"{0}\" - Imported by engine - DO NOT CHANGE THIS LINE **/", scriptLocation);
script.Script = script.Script.Replace(match.Value, importedValue);
}
}
}
}
protected void PreprocessInlines(ref JistScript script)
{
//@inline: inline imports script content into another script.
if (PreprocessorDirectives.inlineRegex.IsMatch(script.Script))
{
foreach (Match match in PreprocessorDirectives.inlineRegex.Matches(script.Script))
{
string scriptLocation = match.Groups[1].Value;
//prevent cyclic references
if (!scriptLocation.Equals(script.FilePathOrUri))
{
JistScript inlineContent = jistParent.LoadScript(scriptLocation, false);
script.Script = script.Script.Replace(match.Value, "");
script.Script = script.Script.Insert(match.Index, string.Format("/** #pragma inline \"{0}\" **/\r\n{1}", scriptLocation, inlineContent.Script));
}
}
}
}
protected void PreprocessImports(ref JistScript script)
{
//@import: tells the preprocessor to import the script into the engine, and load it.
if (PreprocessorDirectives.importRegex.IsMatch(script.Script))
{
foreach (Match match in PreprocessorDirectives.importRegex.Matches(script.Script))
{
string scriptLocation = match.Groups[1].Value;
//prevent cyclic references
if (!scriptLocation.Equals(script.FilePathOrUri))
{
jistParent.LoadScript(scriptLocation);
string importedValue = string.Format("/** #pragma import \"{0}\" - Imported by engine - DO NOT CHANGE THIS LINE **/", scriptLocation);
script.Script = script.Script.Replace(match.Value, importedValue);
}
}
}
}
/// <summary>
/// Processes @require directives.
///
/// @require directives indicate that a script uses functionality provided by a specified.net
/// package in Jist marked with the JavascriptProvides attributre. If Jist is run without that
/// package support, the script will not run.
/// </summary>
protected void PreprocessRequires(ref JistScript script)
{
if (script == null || string.IsNullOrEmpty(script.Script) == true
|| PreprocessorDirectives.requiresRegex.IsMatch(script.Script) == false) {
return;
}
foreach (Match match in PreprocessorDirectives.requiresRegex.Matches(script.Script)) {
string[] packages = match.Groups[2].Value.Split(',');
foreach (string package in packages) {
string trimmedPackage = package.Trim().Replace("\"", "");
if (string.IsNullOrEmpty(trimmedPackage) == true) {
return;
}
script.PackageRequirements.Add(trimmedPackage);
script.Script = script.Script.Replace(match.Value, string.Format("/** #pragma require \"{0}\" - DO NOT CHANGE THIS LINE **/\r\n", trimmedPackage));
}
}
}
/// <summary>
/// Executes a script, and returns it's completion value.
/// </summary>
public JsValue ExecuteScript(JistScript script)
{
if (script == null || string.IsNullOrEmpty(script.Script) == true) {
return JsValue.Undefined;
}
try {
return jsEngine.Execute(script.Script).GetCompletionValue();
} catch (Exception ex) {
ScriptLog.ErrorFormat(script.FilePathOrUri, "Execution error: " + ex.Message);
return JsValue.Undefined;
}
}
/// <summary>
/// Loads a script from file into a reference-counted object, and inserts it into
/// the script container.
///
/// Scripts are /not/ executed by the javascript engine at this point.
/// </summary>
public JistScript LoadScript(string ScriptPath, bool IncreaseRefCount = true)
{
JistScript content;
/*
* if this script has already been called for, return the called object
* with an incremented ref count
*/
if (scriptContainer.Scripts.Count(i =>
i.FilePathOrUri.Equals(ScriptPath, StringComparison.InvariantCultureIgnoreCase)) > 0) {
content = scriptContainer.Scripts.FirstOrDefault(i =>
i.FilePathOrUri.Equals(ScriptPath, StringComparison.InvariantCultureIgnoreCase));
if (IncreaseRefCount) {
content.ReferenceCount++;
}
return null;
}
content = new JistScript();
content.FilePathOrUri = ScriptPath;
content.ReferenceCount = 1;
try {
content.Script = File.ReadAllText(Path.Combine(scriptsDir, content.FilePathOrUri));
} catch (Exception ex) {
ScriptLog.ErrorFormat("engine", "Cannot load {0}: {1}", ScriptPath, ex.Message);
return null;
}
/*
* Script must be added to the content list before preprocessing
* this is to prevent cyclic references between @imports, used as an include guard
*/
scriptContainer.PreprocessScript(content);
scriptContainer.Scripts.Add(content);
return content;
}
