Move schema parsing to its own package

pkg/schema/parse_test.go

@@ -0,0 +1,54 @@
+package schema_test
+
+import (
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"gas_stack/pkg/schema"
+)
+
+func TestParseSchema(t *testing.T) {
+	assert := assert.New(t)
+	schema_sql, err := os.ReadFile("../../sample_data/test_schemas/food.sql")
+	require.NoError(t, err)
+
+	db := schema.InitDB(string(schema_sql))
+	schema := schema.SchemaFromDB(db)
+	expected_tbls := []string{"food_types", "foods", "units", "ingredients", "recipes", "iterations", "db_version"}
+	for _, tbl_name := range expected_tbls {
+		_, is_ok := schema[tbl_name]
+		assert.True(is_ok)
+	}
+
+	foods := schema["foods"]
+	assert.Equal(foods.TableName, "foods")
+	assert.Equal(foods.TypeName, "Food")
+	assert.Equal(foods.TypeIDName, "FoodID")
+	assert.Equal(foods.IsStrict, true)
+	assert.Len(foods.Columns, 20)
+	assert.Equal(foods.Columns[0].Name, "rowid")
+	assert.Equal(foods.Columns[0].Type, "integer")
+	assert.Equal(foods.Columns[0].IsNotNull, false) // Explicit not-null
+	assert.Equal(foods.Columns[0].IsPrimaryKey, true)
+	assert.Equal(foods.Columns[0].IsForeignKey, false)
+	assert.Equal(foods.Columns[1].Name, "name")
+	assert.Equal(foods.Columns[1].Type, "text")
+	assert.Equal(foods.Columns[1].IsNotNull, true)
+	assert.Equal(foods.Columns[1].HasDefaultValue, false)
+	assert.Equal(foods.Columns[1].IsPrimaryKey, false)
+	assert.Equal(foods.Columns[16].Name, "mass")
+	assert.Equal(foods.Columns[16].Type, "real")
+	assert.Equal(foods.Columns[16].HasDefaultValue, true)
+	assert.Equal(foods.Columns[16].DefaultValue, "100")
+
+	ingredients := schema["ingredients"]
+	assert.Equal(ingredients.Columns[0].Name, "rowid")
+	assert.Equal(ingredients.Columns[0].IsPrimaryKey, true)
+	assert.Equal(ingredients.Columns[1].Name, "food_id")
+	assert.Equal(ingredients.Columns[1].IsForeignKey, true)
+	assert.Equal(ingredients.Columns[1].ForeignKeyTargetTable, "foods")
+	assert.Equal(ingredients.Columns[1].ForeignKeyTargetColumn, "rowid")
+}