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source.go
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source.go
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package parser
import (
"fmt"
"go/ast"
"go/token"
"path/filepath"
"strconv"
"sync"
"github.com/markbates/pkger/here"
)
type Source struct {
Abs string // full path on disk to file
Path here.Path
Here here.Info
}
type ParsedSource struct {
Source
FileSet *token.FileSet
Ast *ast.File
decls map[string]Decls
once sync.Once
err error
}
func (p *ParsedSource) Parse() error {
(&p.once).Do(func() {
p.err = p.parse()
})
return p.err
}
func (p *ParsedSource) value(node ast.Node) (string, error) {
var s string
switch x := node.(type) {
case *ast.BasicLit:
s = x.Value
case *ast.Ident:
s = x.Name
}
return strconv.Unquote(s)
}
func (p *ParsedSource) parse() error {
p.decls = map[string]Decls{}
var fn walker = func(node ast.Node) bool {
ce, ok := node.(*ast.CallExpr)
if !ok {
return true
}
sel, ok := ce.Fun.(*ast.SelectorExpr)
if !ok {
return true
}
pkg, ok := sel.X.(*ast.Ident)
if !ok {
return true
}
if pkg.Name != "pkger" {
return true
}
var fn func(f File, pos token.Position, value string) Decl
name := sel.Sel.Name
switch name {
case "MkdirAll":
fn = func(f File, pos token.Position, value string) Decl {
return MkdirAllDecl{
file: &f,
pos: pos,
value: value,
}
}
case "Create":
fn = func(f File, pos token.Position, value string) Decl {
return CreateDecl{
file: &f,
pos: pos,
value: value,
}
}
case "Include":
fn = func(f File, pos token.Position, value string) Decl {
return IncludeDecl{
file: &f,
pos: pos,
value: value,
}
}
case "Stat":
fn = func(f File, pos token.Position, value string) Decl {
return StatDecl{
file: &f,
pos: pos,
value: value,
}
}
case "Open":
fn = func(f File, pos token.Position, value string) Decl {
return OpenDecl{
file: &f,
pos: pos,
value: value,
}
}
case "Dir":
fn = func(f File, pos token.Position, value string) Decl {
return HTTPDecl{
file: &f,
pos: pos,
value: value,
}
}
case "Walk":
fn = func(f File, pos token.Position, value string) Decl {
return WalkDecl{
file: &f,
pos: pos,
value: value,
}
}
default:
return true
}
if len(ce.Args) < 1 {
p.err = fmt.Errorf("declarations require at least one argument")
return false
}
n := ce.Args[0]
val, err := p.value(n)
if err != nil {
p.err = fmt.Errorf("%s: %s", err, n)
return false
}
info, err := here.Dir(filepath.Dir(p.Abs))
if err != nil {
p.err = fmt.Errorf("%s: %s", err, p.Abs)
return false
}
pt, err := info.Parse(val)
if err != nil {
p.err = fmt.Errorf("%s: %s", err, p.Abs)
return false
}
if pt.Pkg != info.Module.Path {
info, err = here.Package(pt.Pkg)
if err != nil {
p.err = fmt.Errorf("%s: %s", err, p.Abs)
return false
}
}
f := File{
Abs: filepath.Join(info.Module.Dir, pt.Name),
Here: info,
Path: pt,
}
p.decls[name] = append(p.decls[name], fn(f, p.FileSet.Position(n.Pos()), val))
return true
}
ast.Walk(fn, p.Ast)
return nil
}
func (p *ParsedSource) DeclsMap() (map[string]Decls, error) {
err := p.Parse()
return p.decls, err
}
// wrap a function to fulfill ast.Visitor interface
type walker func(ast.Node) bool
func (w walker) Visit(node ast.Node) ast.Visitor {
if w(node) {
return w
}
return nil
}