290e675625
This reverts commit 42cb28f66e.
Reason for revert: Dead code - map type properties in Module
Change-Id: Ie944a311963cc54258cbc4ba3fc974882e5539ce
443 lines
14 KiB
Go
443 lines
14 KiB
Go
// Copyright 2014 Google Inc. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package proptools
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import (
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"fmt"
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"reflect"
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"sort"
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"strconv"
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"strings"
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"text/scanner"
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"github.com/google/blueprint/parser"
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)
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const maxUnpackErrors = 10
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type UnpackError struct {
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Err error
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Pos scanner.Position
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}
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func (e *UnpackError) Error() string {
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return fmt.Sprintf("%s: %s", e.Pos, e.Err)
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}
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// packedProperty helps to track properties usage (`used` will be true)
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type packedProperty struct {
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property *parser.Property
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used bool
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}
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// unpackContext keeps compound names and their values in a map. It is initialized from
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// parsed properties.
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type unpackContext struct {
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propertyMap map[string]*packedProperty
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errs []error
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}
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// UnpackProperties populates the list of runtime values ("property structs") from the parsed properties.
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// If a property a.b.c has a value, a field with the matching name in each runtime value is initialized
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// from it. See PropertyNameForField for field and property name matching.
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// For instance, if the input contains
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// { foo: "abc", bar: {x: 1},}
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// and a runtime value being has been declared as
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// var v struct { Foo string; Bar int }
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// then v.Foo will be set to "abc" and v.Bar will be set to 1
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// (cf. unpack_test.go for further examples)
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//
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// The type of a receiving field has to match the property type, i.e., a bool/int/string field
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// can be set from a property with bool/int/string value, a struct can be set from a map (only the
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// matching fields are set), and an slice can be set from a list.
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// If a field of a runtime value has been already set prior to the UnpackProperties, the new value
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// is appended to it (see somewhat inappropriately named ExtendBasicType).
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// The same property can initialize fields in multiple runtime values. It is an error if any property
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// value was not used to initialize at least one field.
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func UnpackProperties(properties []*parser.Property, objects ...interface{}) (map[string]*parser.Property, []error) {
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var unpackContext unpackContext
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unpackContext.propertyMap = make(map[string]*packedProperty)
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if !unpackContext.buildPropertyMap("", properties) {
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return nil, unpackContext.errs
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}
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for _, obj := range objects {
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valueObject := reflect.ValueOf(obj)
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if !isStructPtr(valueObject.Type()) {
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panic(fmt.Errorf("properties must be *struct, got %s",
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valueObject.Type()))
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}
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unpackContext.unpackToStruct("", valueObject.Elem())
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if len(unpackContext.errs) >= maxUnpackErrors {
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return nil, unpackContext.errs
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}
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}
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// Gather property map, and collect any unused properties.
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// Avoid reporting subproperties of unused properties.
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result := make(map[string]*parser.Property)
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var unusedNames []string
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for name, v := range unpackContext.propertyMap {
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if v.used {
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result[name] = v.property
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} else {
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unusedNames = append(unusedNames, name)
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}
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}
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if len(unusedNames) == 0 && len(unpackContext.errs) == 0 {
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return result, nil
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}
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return nil, unpackContext.reportUnusedNames(unusedNames)
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}
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func (ctx *unpackContext) reportUnusedNames(unusedNames []string) []error {
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sort.Strings(unusedNames)
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var lastReported string
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for _, name := range unusedNames {
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// if 'foo' has been reported, ignore 'foo\..*' and 'foo\[.*'
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if lastReported != "" {
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trimmed := strings.TrimPrefix(name, lastReported)
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if trimmed != name && (trimmed[0] == '.' || trimmed[0] == '[') {
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continue
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}
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}
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ctx.errs = append(ctx.errs, &UnpackError{
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fmt.Errorf("unrecognized property %q", name),
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ctx.propertyMap[name].property.ColonPos})
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lastReported = name
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}
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return ctx.errs
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}
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func (ctx *unpackContext) buildPropertyMap(prefix string, properties []*parser.Property) bool {
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nOldErrors := len(ctx.errs)
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for _, property := range properties {
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name := fieldPath(prefix, property.Name)
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if first, present := ctx.propertyMap[name]; present {
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ctx.addError(
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&UnpackError{fmt.Errorf("property %q already defined", name), property.ColonPos})
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if ctx.addError(
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&UnpackError{fmt.Errorf("<-- previous definition here"), first.property.ColonPos}) {
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return false
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}
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continue
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}
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ctx.propertyMap[name] = &packedProperty{property, false}
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switch propValue := property.Value.Eval().(type) {
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case *parser.Map:
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ctx.buildPropertyMap(name, propValue.Properties)
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case *parser.List:
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// If it is a list, unroll it unless its elements are of primitive type
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// (no further mapping will be needed in that case, so we avoid cluttering
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// the map).
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if len(propValue.Values) == 0 {
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continue
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}
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if t := propValue.Values[0].Type(); t == parser.StringType || t == parser.Int64Type || t == parser.BoolType {
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continue
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}
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itemProperties := make([]*parser.Property, len(propValue.Values), len(propValue.Values))
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for i, expr := range propValue.Values {
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itemProperties[i] = &parser.Property{
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Name: property.Name + "[" + strconv.Itoa(i) + "]",
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NamePos: property.NamePos,
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ColonPos: property.ColonPos,
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Value: expr,
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}
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}
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if !ctx.buildPropertyMap(prefix, itemProperties) {
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return false
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}
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}
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}
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return len(ctx.errs) == nOldErrors
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}
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func fieldPath(prefix, fieldName string) string {
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if prefix == "" {
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return fieldName
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}
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return prefix + "." + fieldName
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}
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func (ctx *unpackContext) addError(e error) bool {
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ctx.errs = append(ctx.errs, e)
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return len(ctx.errs) < maxUnpackErrors
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}
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func (ctx *unpackContext) unpackToStruct(namePrefix string, structValue reflect.Value) {
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structType := structValue.Type()
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for i := 0; i < structValue.NumField(); i++ {
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fieldValue := structValue.Field(i)
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field := structType.Field(i)
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// In Go 1.7, runtime-created structs are unexported, so it's not
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// possible to create an exported anonymous field with a generated
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// type. So workaround this by special-casing "BlueprintEmbed" to
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// behave like an anonymous field for structure unpacking.
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if field.Name == "BlueprintEmbed" {
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field.Name = ""
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field.Anonymous = true
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}
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if field.PkgPath != "" {
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// This is an unexported field, so just skip it.
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continue
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}
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propertyName := fieldPath(namePrefix, PropertyNameForField(field.Name))
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if !fieldValue.CanSet() {
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panic(fmt.Errorf("field %s is not settable", propertyName))
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}
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// Get the property value if it was specified.
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packedProperty, propertyIsSet := ctx.propertyMap[propertyName]
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origFieldValue := fieldValue
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// To make testing easier we validate the struct field's type regardless
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// of whether or not the property was specified in the parsed string.
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// TODO(ccross): we don't validate types inside nil struct pointers
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// Move type validation to a function that runs on each factory once
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switch kind := fieldValue.Kind(); kind {
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case reflect.Bool, reflect.String, reflect.Struct, reflect.Slice:
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// Do nothing
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case reflect.Interface:
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if fieldValue.IsNil() {
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panic(fmt.Errorf("field %s contains a nil interface", propertyName))
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}
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fieldValue = fieldValue.Elem()
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elemType := fieldValue.Type()
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if elemType.Kind() != reflect.Ptr {
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panic(fmt.Errorf("field %s contains a non-pointer interface", propertyName))
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}
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fallthrough
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case reflect.Ptr:
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switch ptrKind := fieldValue.Type().Elem().Kind(); ptrKind {
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case reflect.Struct:
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if fieldValue.IsNil() && (propertyIsSet || field.Anonymous) {
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// Instantiate nil struct pointers
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// Set into origFieldValue in case it was an interface, in which case
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// fieldValue points to the unsettable pointer inside the interface
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fieldValue = reflect.New(fieldValue.Type().Elem())
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origFieldValue.Set(fieldValue)
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}
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fieldValue = fieldValue.Elem()
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case reflect.Bool, reflect.Int64, reflect.String:
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// Nothing
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default:
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panic(fmt.Errorf("field %s contains a pointer to %s", propertyName, ptrKind))
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}
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case reflect.Int, reflect.Uint:
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if !HasTag(field, "blueprint", "mutated") {
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panic(fmt.Errorf(`int field %s must be tagged blueprint:"mutated"`, propertyName))
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}
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default:
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panic(fmt.Errorf("unsupported kind for field %s: %s", propertyName, kind))
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}
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if field.Anonymous && isStruct(fieldValue.Type()) {
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ctx.unpackToStruct(namePrefix, fieldValue)
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continue
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}
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if !propertyIsSet {
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// This property wasn't specified.
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continue
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}
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packedProperty.used = true
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property := packedProperty.property
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if HasTag(field, "blueprint", "mutated") {
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if !ctx.addError(
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&UnpackError{
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fmt.Errorf("mutated field %s cannot be set in a Blueprint file", propertyName),
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property.ColonPos,
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}) {
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return
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}
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continue
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}
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if isStruct(fieldValue.Type()) {
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if property.Value.Eval().Type() != parser.MapType {
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ctx.addError(&UnpackError{
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fmt.Errorf("can't assign %s value to map property %q",
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property.Value.Type(), property.Name),
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property.Value.Pos(),
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})
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continue
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}
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ctx.unpackToStruct(propertyName, fieldValue)
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if len(ctx.errs) >= maxUnpackErrors {
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return
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}
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} else if isSlice(fieldValue.Type()) {
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if unpackedValue, ok := ctx.unpackToSlice(propertyName, property, fieldValue.Type()); ok {
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ExtendBasicType(fieldValue, unpackedValue, Append)
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}
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if len(ctx.errs) >= maxUnpackErrors {
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return
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}
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} else {
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unpackedValue, err := propertyToValue(fieldValue.Type(), property)
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if err != nil && !ctx.addError(err) {
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return
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}
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ExtendBasicType(fieldValue, unpackedValue, Append)
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}
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}
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}
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// unpackSlice creates a value of a given slice type from the property which should be a list
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func (ctx *unpackContext) unpackToSlice(
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sliceName string, property *parser.Property, sliceType reflect.Type) (reflect.Value, bool) {
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propValueAsList, ok := property.Value.Eval().(*parser.List)
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if !ok {
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ctx.addError(&UnpackError{
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fmt.Errorf("can't assign %s value to list property %q",
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property.Value.Type(), property.Name),
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property.Value.Pos(),
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})
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return reflect.MakeSlice(sliceType, 0, 0), false
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}
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exprs := propValueAsList.Values
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value := reflect.MakeSlice(sliceType, 0, len(exprs))
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if len(exprs) == 0 {
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return value, true
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}
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// The function to construct an item value depends on the type of list elements.
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var getItemFunc func(*parser.Property, reflect.Type) (reflect.Value, bool)
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switch exprs[0].Type() {
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case parser.BoolType, parser.StringType, parser.Int64Type:
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getItemFunc = func(property *parser.Property, t reflect.Type) (reflect.Value, bool) {
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value, err := propertyToValue(t, property)
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if err != nil {
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ctx.addError(err)
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return value, false
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}
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return value, true
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}
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case parser.ListType:
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getItemFunc = func(property *parser.Property, t reflect.Type) (reflect.Value, bool) {
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return ctx.unpackToSlice(property.Name, property, t)
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}
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case parser.MapType:
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getItemFunc = func(property *parser.Property, t reflect.Type) (reflect.Value, bool) {
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itemValue := reflect.New(t).Elem()
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ctx.unpackToStruct(property.Name, itemValue)
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return itemValue, true
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}
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case parser.NotEvaluatedType:
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getItemFunc = func(property *parser.Property, t reflect.Type) (reflect.Value, bool) {
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return reflect.New(t), false
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}
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default:
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panic(fmt.Errorf("bizarre property expression type: %v", exprs[0].Type()))
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}
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itemProperty := &parser.Property{NamePos: property.NamePos, ColonPos: property.ColonPos}
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elemType := sliceType.Elem()
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isPtr := elemType.Kind() == reflect.Ptr
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for i, expr := range exprs {
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itemProperty.Name = sliceName + "[" + strconv.Itoa(i) + "]"
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itemProperty.Value = expr
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if packedProperty, ok := ctx.propertyMap[itemProperty.Name]; ok {
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packedProperty.used = true
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}
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if isPtr {
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if itemValue, ok := getItemFunc(itemProperty, elemType.Elem()); ok {
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ptrValue := reflect.New(itemValue.Type())
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ptrValue.Elem().Set(itemValue)
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value = reflect.Append(value, ptrValue)
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}
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} else {
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if itemValue, ok := getItemFunc(itemProperty, elemType); ok {
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value = reflect.Append(value, itemValue)
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}
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}
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}
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return value, true
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}
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// propertyToValue creates a value of a given value type from the property.
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func propertyToValue(typ reflect.Type, property *parser.Property) (reflect.Value, error) {
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var value reflect.Value
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var baseType reflect.Type
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isPtr := typ.Kind() == reflect.Ptr
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if isPtr {
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baseType = typ.Elem()
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} else {
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baseType = typ
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}
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switch kind := baseType.Kind(); kind {
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case reflect.Bool:
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b, ok := property.Value.Eval().(*parser.Bool)
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if !ok {
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return value, &UnpackError{
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fmt.Errorf("can't assign %s value to bool property %q",
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property.Value.Type(), property.Name),
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property.Value.Pos(),
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}
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}
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value = reflect.ValueOf(b.Value)
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case reflect.Int64:
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b, ok := property.Value.Eval().(*parser.Int64)
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if !ok {
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return value, &UnpackError{
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fmt.Errorf("can't assign %s value to int64 property %q",
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property.Value.Type(), property.Name),
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property.Value.Pos(),
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}
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}
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value = reflect.ValueOf(b.Value)
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case reflect.String:
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s, ok := property.Value.Eval().(*parser.String)
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if !ok {
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return value, &UnpackError{
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fmt.Errorf("can't assign %s value to string property %q",
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property.Value.Type(), property.Name),
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property.Value.Pos(),
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}
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}
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value = reflect.ValueOf(s.Value)
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default:
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return value, &UnpackError{
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fmt.Errorf("cannot assign %s value %s to %s property %s", property.Value.Type(), property.Value, kind, typ),
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property.NamePos}
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}
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if isPtr {
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ptrValue := reflect.New(value.Type())
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ptrValue.Elem().Set(value)
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return ptrValue, nil
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}
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return value, nil
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}
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