initial commit; we have evaluation!

words.go

@@ -0,0 +1,33 @@
+package main
+
+import "fmt"
+
+// Dictionary is a simple map of names to words
+type Dictionary map[string]Word
+
+// A Word defines a subroutine
+type Word struct {
+	Name   string
+	Impl   func() error
+	Source string
+}
+
+// AddWord inserts a new word into the dictonary, optionally overwriting the existing word
+func (d Dictionary) AddWord(name string, impl func() error, source string) {
+	d[name] = Word{
+		Name:   name,
+		Impl:   impl,
+		Source: source,
+	}
+}
+
+// GetWord returns a word from the dictionary or an error if it's undefined
+func (d Dictionary) GetWord(name string) (Word, error) {
+	w, ok := d[name]
+	if !ok {
+		return Word{
+			Name: name,
+		}, fmt.Errorf("no word found")
+	}
+	return w, nil
+}