Implemented function scanning

src/core/Function.go

@@ -0,0 +1,44 @@
+package core
+
+import (
+	"fmt"
+
+	"git.urbach.dev/cli/q/src/fs"
+	"git.urbach.dev/cli/q/src/token"
+)
+
+// Function is the smallest unit of code.
+type Function struct {
+	name   string
+	file   *fs.File
+	Input  []*Parameter
+	Output []*Parameter
+	Body   token.List
+}
+
+// NewFunction creates a new function.
+func NewFunction(name string, file *fs.File) *Function {
+	return &Function{
+		name: name,
+		file: file,
+	}
+}
+
+// IsExtern returns true if the function has no body.
+func (f *Function) IsExtern() bool {
+	return f.Body == nil
+}
+
+// ResolveTypes parses the input and output types.
+func (f *Function) ResolveTypes() error {
+	for _, param := range f.Input {
+		param.name = param.tokens[0].String(f.file.Bytes)
+	}
+
+	return nil
+}
+
+// String returns the package and function name.
+func (f *Function) String() string {
+	return fmt.Sprintf("%s.%s", f.file.Package, f.name)
+}