forked from francoispqt/gojay
/
generator.go
321 lines (273 loc) · 6.98 KB
/
generator.go
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package codegen
import (
"fmt"
"go/format"
"go/parser"
"go/token"
"io/ioutil"
"os"
"path/filepath"
"strings"
"github.com/viant/toolbox"
)
const gojayPackage = "github.com/francoispqt/gojay"
// Generator holds the content to generate the gojay code
type Generator struct {
fileInfo *toolbox.FileSetInfo
types map[string]string
structTypes map[string]string
sliceTypes map[string]string
pooledObjects map[string]string
poolInit map[string]string
imports map[string]bool
filedInit []string
Pkg string
Code string
Init string
Imports string
options *Options
}
// Returns the type from the the fileInfo
func (g *Generator) Type(typeName string) *toolbox.TypeInfo {
return g.fileInfo.Type(typeName)
}
// addImport adds an import package to be printed on the generated code
func (g *Generator) addImport(pkg string) {
g.imports[`"`+pkg+`"`] = true
}
// we initiate the variables containing the code to be generated
func (g *Generator) init() {
g.filedInit = []string{}
g.imports = map[string]bool{}
g.pooledObjects = map[string]string{}
g.structTypes = map[string]string{}
g.sliceTypes = map[string]string{}
g.poolInit = map[string]string{}
g.addImport(gojayPackage)
// if we want pools, add the sync package right away
if g.options.PoolObjects {
g.addImport("sync")
}
}
// NewGenerator creates a new generator with the given options
func NewGenerator(options *Options) *Generator {
var g = &Generator{}
// first we validate the flags
if err := options.Validate(); err != nil {
panic(err)
}
g.options = options
// we initiate the values on the generator
g.init()
return g
}
// Generate generates the gojay implementation code
func (g *Generator) Generate() error {
// first we read the code from which we should find the types
if err := g.readPackageCode(g.options.Source); err != nil {
return err
}
// then we generate code for the types given
for _, rootType := range g.options.Types {
if err := g.generateStructCode(rootType); err != nil {
return err
}
}
g.Imports = strings.Join(toolbox.MapKeysToStringSlice(g.imports), "\n")
return g.writeCode()
}
func (g *Generator) writeCode() error {
var generatedCode = []string{}
for _, key := range sortedKeys(g.pooledObjects) {
code := g.pooledObjects[key]
generatedCode = append(generatedCode, code)
}
generatedCode = append(generatedCode, "")
for _, key := range sortedKeys(g.sliceTypes) {
code := g.sliceTypes[key]
generatedCode = append(generatedCode, code)
}
generatedCode = append(generatedCode, "")
for _, key := range sortedKeys(g.structTypes) {
code := g.structTypes[key]
generatedCode = append(generatedCode, code)
}
for _, key := range sortedKeys(g.poolInit) {
code := g.poolInit[key]
if g.Init != "" {
g.Init += "\n"
}
g.Init += code
}
g.Code = strings.Join(generatedCode, "\n")
expandedCode, err := expandBlockTemplate(fileCode, g)
if err != nil {
return err
}
code, err := format.Source([]byte(expandedCode))
if err != nil {
return err
}
// code destination is empty, we just print to stdout
if g.options.Dest == "" {
fmt.Print(string(code))
return nil
}
return ioutil.WriteFile(g.options.Dest, code, 0644)
}
func (g *Generator) generatePrimitiveArray(field *Field) error {
key := field.ComponentType + toolbox.AsString(field.IsPointerComponent)
if _, ok := g.sliceTypes[key]; ok {
return nil
}
code, err := expandBlockTemplate(baseTypeSlice, field)
g.sliceTypes[key] = code
return err
}
func (g *Generator) generateObjectArray(field *Field) error {
if _, ok := g.sliceTypes[field.RawComponentType]; ok {
return nil
}
if err := g.generateStructCode(field.ComponentType); err != nil {
return err
}
code, err := expandBlockTemplate(structTypeSlice, field)
if err != nil {
return err
}
g.sliceTypes[field.RawComponentType] = code
return err
}
func (g *Generator) generateObjectMap(field *Field) error {
//if _, ok := g.sliceTypes[field.RawComponentType]; ok {
// return nil
//}
if err := g.generateStructCode(field.ComponentType); err != nil {
return err
}
code, err := expandBlockTemplate(structTypeMap, field)
if err != nil {
return err
}
g.sliceTypes[field.RawComponentType] = code
return err
}
func (g *Generator) generateTimeArray(field *Field) error {
if _, ok := g.sliceTypes[field.RawComponentType]; ok {
return nil
}
code, err := expandBlockTemplate(timeSlice, field)
if err != nil {
return err
}
g.sliceTypes[field.RawComponentType] = code
return err
}
func (g *Generator) generateTypedArray(field *Field) error {
if _, ok := g.sliceTypes[field.RawComponentType]; ok {
return nil
}
code, err := expandBlockTemplate(typeSlice, field)
if err != nil {
return err
}
g.sliceTypes[field.RawComponentType] = code
return err
}
func (g *Generator) generatePool(structType string) error {
if !g.options.PoolObjects {
return nil
}
var err error
if g.pooledObjects[structType], err = expandBlockTemplate(poolVar, struct {
PoolName string
}{getPoolName(structType)}); err == nil {
g.poolInit[structType], err = expandBlockTemplate(poolInit, struct {
PoolName string
Type string
}{getPoolName(structType), structType})
}
return err
}
func (g *Generator) generateStructCode(structType string) error {
structType = normalizeTypeName(structType)
typeInfo := g.Type(structType)
if typeInfo == nil {
return nil
}
if _, hasCode := g.structTypes[structType]; hasCode {
return nil
}
g.generatePool(structType)
aStruct := NewStruct(typeInfo, g)
code, err := aStruct.Generate()
if err != nil {
return err
}
g.structTypes[structType] = code
return nil
}
func (g *Generator) readPackageCode(pkgPath string) error {
p, err := filepath.Abs(pkgPath)
if err != nil {
return err
}
var f os.FileInfo
if f, err = os.Stat(p); err != nil {
return err
}
g.setPackageName(p)
if f.IsDir() {
g.fileInfo, err = toolbox.NewFileSetInfo(p)
} else {
dir, _ := filepath.Split(p)
g.fileInfo, err = toolbox.NewFileSetInfo(dir)
}
return err
}
func (g *Generator) setPackageName(p string) error {
if g.options.Pkg != "" {
g.Pkg = g.options.Pkg
return nil
}
f, err := os.Stat(p)
if err != nil {
return err
}
var goFile string
if f.IsDir() {
goFile, err = getGOFile(p)
if err != nil {
return err
}
} else if isGOFile(f.Name()) {
goFile = p
} else {
return fmt.Errorf("no GO file found")
}
// parse the go source file, but only the package clause
astFile, err := parser.ParseFile(token.NewFileSet(), goFile, nil, parser.PackageClauseOnly)
if err != nil {
return err
}
if astFile.Name == nil {
return fmt.Errorf("no package name found")
}
g.Pkg = astFile.Name.Name
return nil
}
func getGOFile(dir string) (string, error) {
entries, err := ioutil.ReadDir(dir)
if err != nil {
return "", err
}
for _, f := range entries {
if isGOFile(f.Name()) {
return fmt.Sprintf("%s/%s", dir, f.Name()), nil
}
}
return "", fmt.Errorf("no GO files found in directory %s", dir)
}
func isGOFile(f string) bool {
return filepath.Ext(f) == ".go"
}