/
transform_models.go
62 lines (53 loc) · 1.88 KB
/
transform_models.go
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// Copyright (C) 2017 Space Monkey, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package xform
import (
"gopkg.in/spacemonkeygo/dbx.v1/ast"
"gopkg.in/spacemonkeygo/dbx.v1/errutil"
"gopkg.in/spacemonkeygo/dbx.v1/ir"
)
func transformModels(lookup *lookup, ast_models []*ast.Model) (
models []*ir.Model, err error) {
// step 1. create all the Model and Field instances and set their pointers
// to point at each other appropriately.
for _, ast_model := range ast_models {
link, err := lookup.AddModel(ast_model)
if err != nil {
return nil, err
}
for _, ast_field := range ast_model.Fields {
if err := link.AddField(ast_field); err != nil {
return nil, err
}
}
}
// step 2. resolve all of the other fields on the models and Fields
// including references between them. also check for duplicate table names.
table_names := map[string]*ast.Model{}
for _, ast_model := range ast_models {
model_entry := lookup.GetModel(ast_model.Name.Value)
if err := transformModel(lookup, model_entry); err != nil {
return nil, err
}
model := model_entry.model
if existing := table_names[model.Table]; existing != nil {
return nil, errutil.New(ast_model.Pos,
"table %q already used by model %q (%s)",
model.Table, existing.Name.Get(), existing.Pos)
}
table_names[model.Table] = ast_model
models = append(models, model_entry.model)
}
return models, nil
}