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parser.go
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parser.go
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package main
import (
"fmt"
"go/parser"
"go/token"
"io/fs"
"path/filepath"
"github.com/g4s8/envdoc/ast"
)
type parserConfigOption func(*Parser)
func withDebug(debug bool) parserConfigOption {
return func(p *Parser) {
p.debug = debug
}
}
func withExecConfig(execFile string, execLine int) parserConfigOption {
return func(p *Parser) {
p.gogenFile = execFile
p.gogenLine = execLine
}
}
type Parser struct {
dir string
fileGlob string
typeGlob string
gogenLine int
gogenFile string
debug bool
}
func NewParser(dir, fileGlob, typeGlob string, opts ...parserConfigOption) *Parser {
p := &Parser{
dir: dir,
fileGlob: fileGlob,
typeGlob: typeGlob,
}
for _, opt := range opts {
opt(p)
}
return p
}
func (p *Parser) Parse() ([]*ast.FileSpec, error) {
fset := token.NewFileSet()
var matcher func(fs.FileInfo) bool
if p.fileGlob != "" {
m, err := newGlobFileMatcher(p.fileGlob)
if err != nil {
return nil, err
}
matcher = m
}
var colOpts []ast.RootCollectorOption
if p.typeGlob == "" {
colOpts = append(colOpts, ast.WithGoGenDecl(p.gogenLine, p.gogenFile))
} else {
m, err := newGlobMatcher(p.typeGlob)
if err != nil {
return nil, fmt.Errorf("create type glob matcher: %w", err)
}
colOpts = append(colOpts, ast.WithTypeGlob(m))
}
if p.fileGlob != "" {
m, err := newGlobMatcher(p.fileGlob)
if err != nil {
return nil, fmt.Errorf("create file glob matcher: %w", err)
}
colOpts = append(colOpts, ast.WithFileGlob(m))
}
col := ast.NewRootCollector(p.dir, colOpts...)
if p.debug {
fmt.Printf("Parsing dir %q (f=%q t=%q)\n", p.dir, p.fileGlob, p.typeGlob)
}
// walk through the directory and each subdirectory and call parseDir for each of them
if err := filepath.Walk(p.dir, func(path string, info fs.FileInfo, err error) error {
if err != nil {
return fmt.Errorf("failed to walk through dir: %w", err)
}
if !info.IsDir() {
return nil
}
if err := parseDir(path, fset, matcher, col); err != nil {
return fmt.Errorf("failed to parse dir %q: %w", path, err)
}
return nil
}); err != nil {
return nil, fmt.Errorf("failed to walk through dir: %w", err)
}
if p.debug {
fmt.Printf("Resolved types:\n")
printTraverse(col.Files(), 0)
}
return col.Files(), nil
}
func parseDir(dir string, fset *token.FileSet, matcher func(fs.FileInfo) bool, col *ast.RootCollector) error {
pkgs, err := parser.ParseDir(fset, dir, nil, parser.ParseComments|parser.SkipObjectResolution)
if err != nil {
return fmt.Errorf("failed to parse dir: %w", err)
}
for _, pkg := range pkgs {
ast.Walk(pkg, fset, col)
}
return nil
}