/
gofile_scanner.go
198 lines (172 loc) · 3.49 KB
/
gofile_scanner.go
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package scan
import (
"fmt"
"go/scanner"
"go/token"
"os"
)
type GoFileScanner interface {
Skip() *SkipExtractor
Package() *PackageExtractor
Import() *ImportExtractor
Type() *TypeExtractor
Element() *ElementsExtractor
Generics() *GenericsExtractor
}
func (f *GoFile) Skip() *SkipExtractor {
return &SkipExtractor{}
}
func (f *GoFile) Package() *PackageExtractor {
return &PackageExtractor{
f: f,
}
}
func (f *GoFile) Import() *ImportExtractor {
return &ImportExtractor{
f: f,
}
}
func (f *GoFile) Type(idx int) *TypeExtractor {
return &TypeExtractor{
f: f,
idx: idx,
}
}
func (f *GoFile) Element(idx, depth int) *ElementsExtractor {
return &ElementsExtractor{
f: f,
idx: idx,
lvl: depth,
}
}
func (f *GoFile) Struct(idx, depth int) *StructExtractor {
return &StructExtractor{
f: f,
idx: idx,
lvl: depth,
}
}
func (f *GoFile) Interface(idx, depth int) *InterfaceExtractor {
return &InterfaceExtractor{
f: f,
idx: idx,
lvl: depth,
}
}
func (f *GoFile) Generics(idx int) *GenericsExtractor {
return &GenericsExtractor{
f: f,
idx: idx,
}
}
type Filter struct {
key string
idx int
}
func NewFilter(key string, idx int) Filter {
switch key {
case "logicBlock":
return Filter{key: key, idx: idx}
case "input":
return Filter{key: key, idx: idx}
case "return":
return Filter{key: key, idx: idx}
case "block":
return Filter{key: key, idx: idx}
case "receiver":
return Filter{key: key, idx: idx}
default:
return Filter{}
}
}
func applyFilters(f *GoFile, filters ...Filter) *LogicBlock {
var lb *LogicBlock
for _, filter := range filters {
filter := filter
switch filter.key {
case "logicBlock":
lb = f.GetLogicBlock(filter.idx)
case "input":
lb = lb.InputParam(filter.idx)
case "return":
lb = lb.ReturnParam(filter.idx)
case "block":
lb = lb.BlockParam(filter.idx)
case "receiver":
lb = lb.Receiver()
}
}
return lb
}
func (f *GoFile) LBlock(e Extractor, filters ...Filter) *LogicBlockExtractor {
lb := applyFilters(f, filters...)
return &LogicBlockExtractor{
parent: e,
lb: lb,
}
}
func New(path string) (*GoFile, error) {
b, err := os.ReadFile(path)
if err != nil {
return nil, fmt.Errorf("failed to read file: %w", err)
}
return new(path, b), nil
}
func new(path string, b []byte) *GoFile {
return &GoFile{
Path: path,
bytes: b,
Imports: []*Import{},
LogicBlocks: []*LogicBlock{},
}
}
type ParseFunc func(pos token.Pos, tok token.Token, lit string)
func (f *GoFile) Parse(fns ...ParseFunc) error {
var (
fs = token.NewFileSet()
sc = scanner.Scanner{}
err error
extr Extractor = f.Skip()
)
file := fs.AddFile(f.Path, fs.Base(), len(f.bytes))
sc.Init(file, f.bytes, func(pos token.Position, msg string) {
if err == nil {
err = fmt.Errorf("error in %s: %s", pos.String(), msg)
return
}
err = fmt.Errorf("error in %s: %s ; %w", pos.String(), msg, err)
}, scanner.Mode(1))
if err != nil {
return err
}
for {
pos, tok, lit := sc.Scan()
if tok == token.EOF {
break // end of GoFile
}
if extr.Done() {
extr = f.match(tok)
}
extr = extr.Do(pos, tok, lit)
// execute optional functions
for _, fn := range fns {
fn(pos, tok, lit)
}
}
return nil
}
func (f *GoFile) match(tok token.Token) Extractor {
switch tok {
case token.PACKAGE:
return f.Package()
case token.IMPORT:
return f.Import()
case token.TYPE:
f.typeCount += 1
return f.Type(f.typeCount - 1)
case token.SEMICOLON:
return f.Skip()
default:
return f.Skip()
}
}