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parser.go
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parser.go
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// Package parser parses Go code and keeps track of all the types defined
// and provides access to all the constants defined for an int type.
package parser
import (
"go/ast"
"go/build"
"go/parser"
"go/token"
"unicode"
"unicode/utf8"
)
type Parser struct {
PkgPath string
PkgName string
PkgFullName string
StructNames map[string]bool
}
type visitor struct {
*Parser
name string
explicit bool
}
func isExported(name string) bool {
rune, _ := utf8.DecodeRuneInString(name)
return unicode.IsUpper(rune)
}
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:
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[v.name] = true
return nil
}
return v
case *ast.StructType:
// if isExported(v.name) {
//fmt.Printf("@@@@%s: %s\n", v.name, pretty.Sprint(n.Fields))
//v.StructNames = append(v.StructNames, v.name)
// }
return nil
case *ast.FuncDecl:
if isExported(v.name) {
if n.Type.Params.NumFields() == 3 && n.Type.Results.NumFields() == 1 {
params := n.Type.Params.List
result := n.Type.Results.List[0]
if result.Type.(*ast.Ident).Name != "error" {
return nil
}
if p, ok := params[0].Type.(*ast.SelectorExpr); ok {
x := p.X.(*ast.Ident)
s := p.Sel
if x.Name+"."+s.Name == "context.Context" {
v.StructNames[v.name] = true
}
}
}
}
return nil
}
return nil
}
func (p *Parser) Parse(fname string, isDir bool) error {
p.PkgPath = build.Default.GOPATH
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
}