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classifier.go
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classifier.go
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// Copyright 2015 go-swagger maintainers
//
// 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 scan
import (
"fmt"
"go/ast"
"log"
"regexp"
"golang.org/x/tools/go/loader"
)
type packageFilter struct {
Name string
}
func (pf *packageFilter) Matches(path string) bool {
matched, err := regexp.MatchString(pf.Name, path)
if err != nil {
log.Fatal(err)
}
return matched
}
type packageFilters []packageFilter
func (pf packageFilters) HasFilters() bool {
return len(pf) > 0
}
func (pf packageFilters) Matches(path string) bool {
for _, mod := range pf {
if mod.Matches(path) {
return true
}
}
return false
}
type classifiedProgram struct {
Meta []*ast.File
Models []*ast.File
Routes []*ast.File
Operations []*ast.File
Parameters []*ast.File
Responses []*ast.File
}
// programClassifier classifies the files of a program into buckets
// for processing by a swagger spec generator. This buckets files in
// 3 groups: Meta, Models and Operations.
//
// Each of these buckets is then processed with an appropriate parsing strategy
//
// When there are Include or Exclude filters provide they are used to limit the
// candidates prior to parsing.
// The include filters take precedence over the excludes. So when something appears
// in both filters it will be included.
type programClassifier struct {
Includes packageFilters
Excludes packageFilters
}
func (pc *programClassifier) Classify(prog *loader.Program) (*classifiedProgram, error) {
var cp classifiedProgram
for pkg, pkgInfo := range prog.AllPackages {
if Debug {
log.Printf("analyzing: %s\n", pkg.Path())
}
if pc.Includes.HasFilters() {
if !pc.Includes.Matches(pkg.Path()) {
continue
}
} else if pc.Excludes.HasFilters() {
if pc.Excludes.Matches(pkg.Path()) {
continue
}
}
for _, file := range pkgInfo.Files {
var ro, op, mt, pm, rs, mm bool // only add a particular file once
for _, comments := range file.Comments {
var seenStruct string
for _, cline := range comments.List {
if cline != nil {
matches := rxSwaggerAnnotation.FindStringSubmatch(cline.Text)
if len(matches) > 1 {
switch matches[1] {
case "route":
if !ro {
cp.Routes = append(cp.Routes, file)
ro = true
}
case "operation":
if !op {
cp.Operations = append(cp.Operations, file)
op = true
}
case "model":
if !mm {
cp.Models = append(cp.Models, file)
mm = true
}
if seenStruct == "" || seenStruct == matches[1] {
seenStruct = matches[1]
} else {
return nil, fmt.Errorf("classifier: already annotated as %s, can't also be %q", seenStruct, matches[1])
}
case "meta":
if !mt {
cp.Meta = append(cp.Meta, file)
mt = true
}
case "parameters":
if !pm {
cp.Parameters = append(cp.Parameters, file)
pm = true
}
if seenStruct == "" || seenStruct == matches[1] {
seenStruct = matches[1]
} else {
return nil, fmt.Errorf("classifier: already annotated as %s, can't also be %q", seenStruct, matches[1])
}
case "response":
if !rs {
cp.Responses = append(cp.Responses, file)
rs = true
}
if seenStruct == "" || seenStruct == matches[1] {
seenStruct = matches[1]
} else {
return nil, fmt.Errorf("classifier: already annotated as %s, can't also be %q", seenStruct, matches[1])
}
case "strfmt", "name", "discriminated", "file", "enum", "default", "alias", "type":
// TODO: perhaps collect these and pass along to avoid lookups later on
case "allOf":
case "ignore":
default:
return nil, fmt.Errorf("classifier: unknown swagger annotation %q", matches[1])
}
}
}
}
}
}
}
return &cp, nil
}