Initialize fresh import info for each file

The import information was being persisted between files. This was
causing false positives.

Fixes #87

core/analyzer.go

@@ -34,6 +34,14 @@ type ImportInfo struct {
 	InitOnly map[string]bool
 }
 
+func NewImportInfo() *ImportInfo {
+	return &ImportInfo{
+		make(map[string]string),
+		make(map[string]string),
+		make(map[string]bool),
+	}
+}
+
 // The Context is populated with data parsed from the source code as it is scanned.
 // It is passed through to all rule functions as they are called. Rules may use
 // this data in conjunction withe the encoutered AST node.
@@ -92,11 +100,7 @@ func NewAnalyzer(conf map[string]interface{}, logger *log.Logger) Analyzer {
 			nil,
 			nil,
 			nil,
-			&ImportInfo{
+			nil,
-				make(map[string]string),
-				make(map[string]string),
-				make(map[string]bool),
-			},
 		},
 		logger: logger,
 	}
@@ -130,6 +134,7 @@ func (gas *Analyzer) process(filename string, source interface{}) error {
 			return err
 		}
 
+		gas.context.Imports = NewImportInfo()
 		for _, pkg := range gas.context.Pkg.Imports() {
 			gas.context.Imports.Imported[pkg.Path()] = pkg.Name()
 		}

rules/rand.go

@@ -15,6 +15,7 @@
 package rules
 
 import (
+	"fmt"
 	"go/ast"
 
 	gas "github.com/GoASTScanner/gas/core"
@@ -28,6 +29,16 @@ type WeakRand struct {
 
 func (w *WeakRand) Match(n ast.Node, c *gas.Context) (*gas.Issue, error) {
 	if _, matched := gas.MatchCallByPackage(n, c, w.packagePath, w.funcName); matched {
+		fmt.Println("Imported:")
+		for k, v := range c.Imports.Imported {
+			fmt.Printf("%s => %s\n", k, v)
+		}
+		fmt.Println("Aliased:")
+		for k, v := range c.Imports.Aliased {
+			fmt.Printf("%s => %s\n", k, v)
+		}
+		fmt.Println("----------------------------------------")
+
 		return gas.NewIssue(c, n, w.What, w.Severity, w.Confidence), nil
 	}