Added file header token <REQUIRES_CODEGEN_VERSION>.

Author: SteveIves

CodeGenEngine/ErrorReporting.dbl

@@ -45,6 +45,8 @@
 import System
 import System.Collections.Generic
 import System.IO
+import System.Reflection
+import System.Diagnostics
 
 .array 0
 
@@ -162,6 +164,20 @@ namespace CodeGen.Engine
 			currentFileNode = node
 			Visit(node.Body)
 
+			;; Does the template require a specific version of CodeGen?
+			if (node.RequiredCodeGenVersion != ^null)
+			begin
+				data codeGenVersion = Version.Parse(FileVersionInfo.GetVersionInfo(Assembly.GetExecutingAssembly().Location).FileVersion)
+				if (node.RequiredCodeGenVersion > codeGenVersion)
+				begin
+					;;Strip off the last component of the assembly version number
+					data versionString = codeGenVersion.ToString().Substring(0,codeGenVersion.ToString().LastIndexOf("."))
+					;;Display the error
+					data message = String.Format("Template {0} requires a CodeGen {1} or higher. You are running version {2}.", node.Context.CurrentTemplateBaseName,node.RequiredCodeGenVersion.ToString(), versionString)
+					Errors.Add(Tuple.Create(message, (int)0, (int)0, node.Context.CurrentTemplate))
+				end
+			end
+
 			;; Does anythng in the tree require repository structure processing?
 			if ((node.RequiresRepository) && (node.Context.Structures.Count == 0))
 			begin

CodeGenEngine/Parser.dbl

@@ -193,6 +193,14 @@ namespace CodeGen.Engine
 									topLevelNode.ProvideFiles = new List<string>()
 								topLevelNode.ProvideFiles.Add(tokens[ix + 1].Value)
 							end
+							("REQUIRES_CODEGEN_VERSION"),
+							begin
+								data requiredVersion, @Version
+								if (Version.TryParse(tokens[ix + 1].Value.Trim(),requiredVersion)) then
+									topLevelNode.RequiredCodeGenVersion = requiredVersion
+								else
+									reportParserError(errors, tkn, "Token <REQUIRES_CODEGEN_VERSION> contains an invalid version number value!")
+							end
 							("REQUIRES_OPTION"),
 							begin
 								if (topLevelNode.RequiredOptions == ^null)

CodeGenEngine/Tokenizer.dbl

@@ -115,11 +115,12 @@ namespace CodeGen.Engine
 			&
 			&	{ new TokenMeta() {Name = "CODEGEN_FILENAME", TypeOfToken = TokenType.FileHeader, IsPaired = true, Validity = TokenValidity.Anywhere} }, 
 			&	{ new TokenMeta() {Name = "CODEGEN_FOLDER", TypeOfToken = TokenType.FileHeader, IsPaired = true, Validity = TokenValidity.Anywhere} }, 
+			&	{ new TokenMeta() {Name = "OPTIONAL_USERTOKEN", TypeOfToken = TokenType.FileHeader, IsPaired = true, Validity = TokenValidity.Anywhere} }, 
 			&	{ new TokenMeta() {Name = "PROCESS_TEMPLATE", TypeOfToken = TokenType.FileHeader, IsPaired = true, Validity = TokenValidity.Anywhere} }, 
 			&	{ new TokenMeta() {Name = "PROVIDE_FILE", TypeOfToken = TokenType.FileHeader, IsPaired = true, Validity = TokenValidity.Anywhere} }, 
-			&	{ new TokenMeta() {Name = "REQUIRES_USERTOKEN", TypeOfToken = TokenType.FileHeader, IsPaired = true, Validity = TokenValidity.Anywhere} }, 
-			&	{ new TokenMeta() {Name = "OPTIONAL_USERTOKEN", TypeOfToken = TokenType.FileHeader, IsPaired = true, Validity = TokenValidity.Anywhere} }, 
+			&	{ new TokenMeta() {Name = "REQUIRES_CODEGEN_VERSION", TypeOfToken = TokenType.FileHeader, IsPaired = true, Validity = TokenValidity.Anywhere} }, 
 			&	{ new TokenMeta() {Name = "REQUIRES_OPTION", TypeOfToken = TokenType.FileHeader, IsPaired = true, Validity = TokenValidity.Anywhere} }, 
+			&	{ new TokenMeta() {Name = "REQUIRES_USERTOKEN", TypeOfToken = TokenType.FileHeader, IsPaired = true, Validity = TokenValidity.Anywhere} }, 
 			&
 			&	{ new TokenMeta() {Name = "REQUIRES_CUSTOM_BUTTON_EXPRESSION", TypeOfToken = TokenType.FileHeader, IsPaired = true, Validity = TokenValidity.Anywhere} }, 
 			&	{ new TokenMeta() {Name = "REQUIRES_CUSTOM_BUTTON_TOKEN", TypeOfToken = TokenType.FileHeader, IsPaired = true, Validity = TokenValidity.Anywhere} }, 

CodeGenEngine/TreeNodes.dbl

@@ -260,6 +260,7 @@ namespace CodeGen.Engine
         public ProvideFiles, @List<string>
 		public RequiresRepository, boolean, false
 		public RequiresNamespace, boolean, false
+		public RequiredCodeGenVersion, @Version
 
 		;; Taskset level code generation data
         public Context, @CodeGenContext