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// Copyright 2018 The Bazel Authors. All rights reserved.
//
// 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 liteparse
import (
"context"
"encoding/xml"
"fmt"
rdpb "src/tools/ak/res/proto/res_data_go_proto"
rmpb "src/tools/ak/res/proto/res_meta_go_proto"
"src/tools/ak/res/res"
"src/tools/ak/res/respipe/respipe"
"src/tools/ak/res/resxml/resxml"
)
// valuesParse handles all tags beneath <resources> and extracts the associated
// ResourceType/names. Any encountered resources or errors are passed back on the returned channels.
func valuesParse(ctx context.Context, xmlC <-chan resxml.XMLEvent) (<-chan *rdpb.Resource, <-chan error) {
resC := make(chan *rdpb.Resource)
errC := make(chan error)
go func() {
defer close(resC)
defer close(errC)
for {
xe, ok := resxml.ConsumeUntil(res.ResourcesTagName, xmlC)
if !ok {
return
}
resChildrenC := resxml.ForwardChildren(ctx, xe, xmlC)
for xe := range resChildrenC {
se, ok := xe.Token.(xml.StartElement)
if !ok {
// we ignore all non-start elements during a mini-parse.
continue
}
tagChildrenC := resxml.ForwardChildren(ctx, xe, resChildrenC)
ctx := respipe.PrefixErr(ctx, fmt.Sprintf("tag-name: %s at: %d: ", se.Name, xe.Offset))
if t, ok := res.ResourcesTagToType[se.Name.Local]; ok {
if !minResChildParse(ctx, xe, t, tagChildrenC, resC, errC) {
return
}
} else if resxml.SloppyMatches(se.Name, res.ItemTagName) {
if !itemParse(ctx, xe, tagChildrenC, resC, errC) {
return
}
}
for range tagChildrenC {
// exhaust any children beneath this tag, we did not need them in the mini-parse.
}
}
}
}()
return resC, errC
}
// itemParse handles <item name="xxxx" type="yyy"></item> tags that are children of <resources/>
func itemParse(ctx context.Context, xe resxml.XMLEvent, childC <-chan resxml.XMLEvent, resC chan<- *rdpb.Resource, errC chan<- error) bool {
name, err := extractName(xe)
if err != nil {
return respipe.SendErr(ctx, errC, respipe.Errorf(ctx, "%v: expected to encounter name attribute: %v", xe, err))
}
var tv string
for _, a := range resxml.Attrs(xe) {
if resxml.SloppyMatches(res.TypeAttrName, a.Name) {
tv = a.Value
}
}
if tv == "" {
return respipe.SendErr(ctx, errC, respipe.Errorf(ctx, "%v: needs type atttribute", xe))
}
t, err := res.ParseType(tv)
if err != nil {
return respipe.SendErr(ctx, errC, respipe.Errorf(ctx, "%q: cannot convert to type: %v", tv, err))
}
fqn, err := res.ParseName(name, t)
if err != nil {
return respipe.SendErr(ctx, errC, respipe.Errorf(ctx, "%q / type: %s: convert to fqn: %v", name, t, err))
}
r := new(rdpb.Resource)
if err := fqn.SetResource(r); err != nil {
return respipe.SendErr(ctx, errC, respipe.Errorf(ctx, "%v: name->proto failed: %v", fqn, err))
}
return respipe.SendRes(ctx, resC, r)
}
// Returns the value of the name attribute or an error.
func extractName(xe resxml.XMLEvent) (string, error) {
for _, a := range resxml.Attrs(xe) {
if resxml.SloppyMatches(res.NameAttrName, a.Name) {
return a.Value, nil
}
}
return "", fmt.Errorf("Expected to encounter name attribute within: %v", resxml.Attrs(xe))
}
// minResChildParse handles a single top-level tag beneath <resources> and extracts all ResourceTypes/Names beneath it. It returns false if it detects that the context is done.
func minResChildParse(ctx context.Context, xe resxml.XMLEvent, t res.Type, childC <-chan resxml.XMLEvent, resC chan<- *rdpb.Resource, errC chan<- error) bool {
name, err := extractName(xe)
if err != nil {
return respipe.SendErr(ctx, errC, respipe.Errorf(ctx, "%#v: needs name attribute: %v", xe, err))
}
fqn, err := res.ParseName(name, t)
if err != nil {
return respipe.SendErr(ctx, errC, respipe.Errorf(ctx, "%s: invalid name: %v", name, err))
}
r := new(rdpb.Resource)
if err := fqn.SetResource(r); err != nil {
return respipe.SendErr(ctx, errC, respipe.Errorf(ctx, "%v: name->proto failed: %v", fqn, err))
}
if fqn.Type == res.Styleable {
md, ok := parseStyleableChildren(ctx, childC, resC, errC)
if !ok {
return false
}
if err := fqn.SetMetaData(md); err != nil {
return respipe.SendErr(ctx, errC, respipe.Errorf(ctx, "%v: could not set stylablemeta: %v", fqn, err))
}
r.StyleableValue = md
}
if fqn.Type == res.Attr && !parseAttrChildren(ctx, childC, resC, errC) {
return false
}
return respipe.SendRes(ctx, resC, r)
}
// parseAttrChildren looks at the children of an <attr> tag and determines if any of them creates resources.
// If it realizes that the provided ctx is canceled, it returns true, otherwise false.
func parseAttrChildren(ctx context.Context, xmlC <-chan resxml.XMLEvent, resC chan<- *rdpb.Resource, errC chan<- error) bool {
for c := range xmlC {
ce, ok := c.Token.(xml.StartElement)
if !ok {
// do not care about non-start element events.
continue
}
if !resxml.SloppyMatches(res.EnumTagName, ce.Name) && !resxml.SloppyMatches(res.FlagTagName, ce.Name) {
// only want <enum> or <flag> elements
continue
}
enumFlagName, err := extractName(c)
if err != nil {
return respipe.SendErr(ctx, errC, respipe.Errorf(ctx, "%v: flag / enum should have had a name attribute: %v", ce, err))
}
cFqn, err := res.ParseName(enumFlagName, res.ID)
if err != nil {
return respipe.SendErr(ctx, errC, respipe.Errorf(ctx, "%v: could not parse child of <attr>: %v", ce, err))
}
cr := new(rdpb.Resource)
if err := cFqn.SetResource(cr); err != nil {
return respipe.SendErr(ctx, errC, respipe.Errorf(ctx, "%v: name->proto failed: %v", ce, err))
}
if !respipe.SendRes(ctx, resC, cr) {
return false
}
}
return true
}
// parseStyleableChildren looks at the children of a <declare-stylable> tag and determines what resources they create.
func parseStyleableChildren(ctx context.Context, xmlC <-chan resxml.XMLEvent, resC chan<- *rdpb.Resource, errC chan<- error) (*rmpb.StyleableMetaData, bool) {
var attrNames []string
for c := range xmlC {
if _, ok := c.Token.(xml.StartElement); !ok {
// skip events besides start element.
continue
}
name, err := extractName(c)
if err != nil {
// being liberal with what we can encounter under a <declare-styleable> tag.
continue
}
attrFqn, err := res.ParseName(name, res.Attr)
if err != nil {
return nil, respipe.SendErr(ctx, errC, respipe.Errorf(ctx, "%q: could not parse name to fqn: %v", name, err))
}
if attrFqn.Type != res.Attr {
return nil, respipe.SendErr(
ctx, errC, respipe.Errorf(ctx, "%v: name->nameid proto failed: %v", attrFqn, res.ErrWrongType))
}
attrNames = append(attrNames, attrFqn.String())
if attrFqn.Package == "android" {
// since we're not generating android attributes (they already exist already)
// omit the resource proto for these attrs.
continue
}
if attrFqn.Type == res.Attr {
ctx := respipe.PrefixErr(ctx, fmt.Sprintf("%q: <attr> child: ", name))
childC := resxml.ForwardChildren(ctx, c, xmlC)
if !parseAttrChildren(ctx, childC, resC, errC) {
return nil, false
}
}
attrR := new(rdpb.Resource)
if err := attrFqn.SetResource(attrR); err != nil {
return nil, respipe.SendErr(ctx, errC, respipe.Errorf(ctx, "%v: name->proto failed: %v", attrFqn, err))
}
if !respipe.SendRes(ctx, resC, attrR) {
return nil, false
}
}
return &rmpb.StyleableMetaData{
FqnAttributes: attrNames,
}, true
}
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