3 files changed, 59 insertions, 5 deletions
diff --git a/src/texec/eval.go b/src/texec/eval.go
new file mode 100644
index 0000000..8b22f01
--- /dev/null
+++ b/src/texec/eval.go
@@ -0,0 +1,17 @@
+/*
+	Copyright 2020 Kyle Gunger
+
+	Licensed under the Apache License, Version 2.0 (the "License");
+	you may not use this file except in compliance with the License.
+	You may obtain a copy of the License at
+
+		http://www.apache.org/licenses/LICENSE-2.0
+
+	Unless required by applicable law or agreed to in writing, software
+	distributed under the License is distributed on an "AS IS" BASIS,
+	WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+	See the License for the specific language governing permissions and
+	limitations under the License.
+*/
+
+package texec
diff --git a/src/texec/libtnsl.go b/src/texec/libtnsl.go
index c77bd25..7bf4848 100644
--- a/src/texec/libtnsl.go
+++ b/src/texec/libtnsl.go
@@ -16,8 +16,44 @@
 
 package texec
 
+import "fmt"
+
 /**
-	This file represents the 'tnsl' module and a key few functions.
-	These functions should be all that is needed to use the compiler, and no more.
+	libtnsl module stub.  Contains only parts of the io sub-module.
+	Parts included:
+		- io.print
+		- io.println
+		- io.open_file
+		- io.File API for file objects
 */
 
+// tells if the stub supports a function
+func tnslResolve(callPath TPath) bool {
+	l := len(callPath.Module)
+	if l < 2 || l > 3 || callPath.Module[0] != "tnsl" || callPath.Module[1] != "io" {
+		return false
+	}
+	if l > 2 && callPath.Module[2] != "File" {
+		return false
+	}
+
+	if l > 2 {
+		if callPath.Artifact == "write" || callPath.Artifact == "read" || callPath.Artifact == "close" {
+			return true;
+		}
+	} else {
+		if callPath.Artifact == "print" || callPath.Artifact == "println" || callPath.Artifact == "open_file" {
+			return true;
+		}
+	}
+
+	return false
+}
+
+// evaluate a function call.
+// out is the variable out (if any)
+// in is the variable in (if any)
+// callPath is the function being called.
+func tnslEval(out, in *TVaraiable, callPath TPath) {
+
+}
+\ No newline at end of file
diff --git a/src/texec/world.go b/src/texec/world.go
index 7f51c13..6fa6327 100644
--- a/src/texec/world.go
+++ b/src/texec/world.go
@@ -25,13 +25,14 @@ type TVariable struct {
 // TPath represents a pointer to the current module and file
 // that the thread is working in.
 type TPath struct {
-	module []string,
-	file   string
+	Module     []string,
+	Artifact   string
 }
 
 // TContext represents a single thread.
 type TContext struct {
 	CallStack []Node,
+	CallEnv   []TPath,
 	VarMap    []map[string]TVariable
 }
 
@@ -47,4 +48,4 @@ type TWorld struct {
 	Modules  []TModule,
 	MainPath TPath,
 	MainFunc Node
-}
-\ No newline at end of file
+}