Implemented unary operator parsing

src/build/token/Tokenize_test.go

@@ -83,13 +83,81 @@ func TestNumber(t *testing.T) {
 }
 
 func TestOperator(t *testing.T) {
-	tokens := token.Tokenize([]byte(`+ - * /`))
+	tokens := token.Tokenize([]byte(`a + b - c * d / e`))
 
 	expected := []token.Kind{
+		token.Identifier,
 		token.Add,
+		token.Identifier,
 		token.Sub,
+		token.Identifier,
 		token.Mul,
+		token.Identifier,
 		token.Div,
+		token.Identifier,
+		token.EOF,
+	}
+
+	for i, kind := range expected {
+		assert.Equal(t, tokens[i].Kind, kind)
+	}
+}
+
+func TestNegateFirstToken(t *testing.T) {
+	tokens := token.Tokenize([]byte(`-a`))
+
+	expected := []token.Kind{
+		token.Negate,
+		token.Identifier,
+		token.EOF,
+	}
+
+	for i, kind := range expected {
+		assert.Equal(t, tokens[i].Kind, kind)
+	}
+}
+
+func TestNegateAfterGroupStart(t *testing.T) {
+	tokens := token.Tokenize([]byte(`(-a)`))
+
+	expected := []token.Kind{
+		token.GroupStart,
+		token.Negate,
+		token.Identifier,
+		token.GroupEnd,
+		token.EOF,
+	}
+
+	for i, kind := range expected {
+		assert.Equal(t, tokens[i].Kind, kind)
+	}
+}
+
+func TestNegateSub(t *testing.T) {
+	tokens := token.Tokenize([]byte(`-a-b`))
+
+	expected := []token.Kind{
+		token.Negate,
+		token.Identifier,
+		token.Sub,
+		token.Identifier,
+		token.EOF,
+	}
+
+	for i, kind := range expected {
+		assert.Equal(t, tokens[i].Kind, kind)
+	}
+}
+
+func TestNegateAfterOperator(t *testing.T) {
+	tokens := token.Tokenize([]byte(`-a + -b`))
+
+	expected := []token.Kind{
+		token.Negate,
+		token.Identifier,
+		token.Add,
+		token.Negate,
+		token.Identifier,
 		token.EOF,
 	}
 
@@ -99,18 +167,28 @@ func TestOperator(t *testing.T) {
 }
 
 func TestOperatorAssign(t *testing.T) {
-	tokens := token.Tokenize([]byte(`+= -= *= /= &= |= ^= <<= >>=`))
+	tokens := token.Tokenize([]byte(`a += b -= c *= d /= e &= f |= g ^= h <<= i >>= j`))
 
 	expected := []token.Kind{
+		token.Identifier,
 		token.AddAssign,
+		token.Identifier,
 		token.SubAssign,
+		token.Identifier,
 		token.MulAssign,
+		token.Identifier,
 		token.DivAssign,
+		token.Identifier,
 		token.AndAssign,
+		token.Identifier,
 		token.OrAssign,
+		token.Identifier,
 		token.XorAssign,
+		token.Identifier,
 		token.ShlAssign,
+		token.Identifier,
 		token.ShrAssign,
+		token.Identifier,
 		token.EOF,
 	}