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package parser
import (
"go/ast"
"go/parser"
"go/token"
"os/exec"
"strings"
)
const structComment = "easyjson:json"
type Parser struct {
PkgPath string
PkgName string
StructNames []string
AllStructs bool
}
type visitor struct {
*Parser
name string
explicit bool
}
func (p *Parser) needType(comments string) bool {
for _, v := range strings.Split(comments, "\n") {
if strings.HasPrefix(v, structComment) {
return true
}
}
return false
}
func (v *visitor) Visit(n ast.Node) (w ast.Visitor) {
switch n := n.(type) {
case *ast.Package:
return v
case *ast.File:
v.PkgName = n.Name.String()
return v
case *ast.GenDecl:
v.explicit = v.needType(n.Doc.Text())
if !v.explicit && !v.AllStructs {
return nil
}
return v
case *ast.TypeSpec:
v.name = n.Name.String()
// Allow to specify non-structs explicitly independent of '-all' flag.
if v.explicit {
v.StructNames = append(v.StructNames, v.name)
return nil
}
return v
case *ast.StructType:
v.StructNames = append(v.StructNames, v.name)
return nil
}
return nil
}
func (p *Parser) Parse(fname string, isDir bool) error {
var err error
if p.PkgPath, err = getPkgPath(fname, isDir); err != nil {
return err
}
fset := token.NewFileSet()
if isDir {
packages, err := parser.ParseDir(fset, fname, nil, parser.ParseComments)
if err != nil {
return err
}
for _, pckg := range packages {
ast.Walk(&visitor{Parser: p}, pckg)
}
} else {
f, err := parser.ParseFile(fset, fname, nil, parser.ParseComments)
if err != nil {
return err
}
ast.Walk(&visitor{Parser: p}, f)
}
return nil
}
func getDefaultGoPath() (string, error) {
output, err := exec.Command("go", "env", "GOPATH").Output()
return string(output), err
}
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