~sircmpwn/annotatego

86ca63beaf14edbc3443304912889a3eda4fea9b — Drew DeVault 10 months ago
Initial commit; basic AST dumper for research
5 files changed, 272 insertions(+), 0 deletions(-)

A .gitignore
A LICENSE
A go.mod
A main.go
A notes
A  => .gitignore +1 -0
@@ 1,1 @@
annotatego

A  => LICENSE +165 -0
@@ 1,165 @@
                   GNU LESSER GENERAL PUBLIC LICENSE
                       Version 3, 29 June 2007

 Copyright (C) 2019 Drew DeVault
 Everyone is permitted to copy and distribute verbatim copies
 of this license document, but changing it is not allowed.


  This version of the GNU Lesser General Public License incorporates
the terms and conditions of version 3 of the GNU General Public
License, supplemented by the additional permissions listed below.

  0. Additional Definitions.

  As used herein, "this License" refers to version 3 of the GNU Lesser
General Public License, and the "GNU GPL" refers to version 3 of the GNU
General Public License.

  "The Library" refers to a covered work governed by this License,
other than an Application or a Combined Work as defined below.

  An "Application" is any work that makes use of an interface provided
by the Library, but which is not otherwise based on the Library.
Defining a subclass of a class defined by the Library is deemed a mode
of using an interface provided by the Library.

  A "Combined Work" is a work produced by combining or linking an
Application with the Library.  The particular version of the Library
with which the Combined Work was made is also called the "Linked
Version".

  The "Minimal Corresponding Source" for a Combined Work means the
Corresponding Source for the Combined Work, excluding any source code
for portions of the Combined Work that, considered in isolation, are
based on the Application, and not on the Linked Version.

  The "Corresponding Application Code" for a Combined Work means the
object code and/or source code for the Application, including any data
and utility programs needed for reproducing the Combined Work from the
Application, but excluding the System Libraries of the Combined Work.

  1. Exception to Section 3 of the GNU GPL.

  You may convey a covered work under sections 3 and 4 of this License
without being bound by section 3 of the GNU GPL.

  2. Conveying Modified Versions.

  If you modify a copy of the Library, and, in your modifications, a
facility refers to a function or data to be supplied by an Application
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  3. Object Code Incorporating Material from Library Header Files.

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  You may convey a Combined Work under terms of your choice that,
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   d) Do one of the following:

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   Information in the manner specified by section 6 of the GNU GPL
   for conveying Corresponding Source.)

  5. Combined Libraries.

  You may place library facilities that are a work based on the
Library side by side in a single library together with other library
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   on the Library, uncombined with any other library facilities,
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A  => go.mod +3 -0
@@ 1,3 @@
module git.sr.ht/~sircmpwn/annotatego

go 1.12

A  => main.go +71 -0
@@ 1,71 @@
package main

import (
	"fmt"
	"os"
	"go/ast"
	"go/token"
	"go/parser"
)

type identVisitor struct {
	ident    *ast.Ident
	selector *ast.SelectorExpr
}

func (v *identVisitor) Visit(node ast.Node) ast.Visitor {
	if ident, ok := node.(*ast.Ident); ok {
		v.ident = ident
		return nil
	}
	if sel, ok := node.(*ast.SelectorExpr); ok {
		v.selector = sel
	}
	return v
}

type visitor struct {
	indent   string
	fs       *token.FileSet
	filename string
}

func strNode(node ast.Node) string {
	switch node := node.(type) {
	case *ast.Ident:
		return fmt.Sprintf("ident{%s, %v}", node.Name, node.Obj)
	case *ast.CallExpr:
		return fmt.Sprintf("callExpr{fn: %T %v %s}",
			node.Fun, node.Fun, strNode(node.Fun))
	}
	return fmt.Sprintf("%v", node)
}

func (v visitor) Visit(node ast.Node) ast.Visitor {
	if node == nil {
		v.indent = v.indent[:len(v.indent)-2]
		return v
	}
	pos := v.fs.Position(node.Pos())
	fmt.Printf("%s:%d:%d: %s%T %p %v\n", v.filename,
		pos.Line, pos.Column, v.indent, node, node, strNode(node))
	v.indent += "  "
	return v
}

func main() {
	var fs *token.FileSet = token.NewFileSet()
	for _, arg := range os.Args[1:] {
		pkgs, err := parser.ParseDir(fs, arg, nil, 0)
		if err != nil {
			panic(err)
		}
		for _, pkg := range pkgs {
			for filename, file := range pkg.Files {
				for _, decl := range file.Decls {
					ast.Walk(visitor{"", fs, filename}, decl)
				}
			}
		}
	}
}

A  => notes +32 -0
@@ 1,32 @@
function declarations are fairly straightforward:

	*ast.FuncDecl &{<nil> 0xc000084960 setId 0xc00000cc80 0xc0000849f0}
	  *ast.FieldList &{678 [0xc0000207c0] 693}
		*ast.Field &{<nil> [worker] 0xc00000ca60 <nil> <nil>}
		  *ast.Ident ident{worker, &{var worker 0xc0000207c0 <nil> <nil>}}
		   *ast.StarExpr &{686 Worker}
			 *ast.Ident ident{Worker, &{type Worker 0xc0000843c0 <nil> <nil>}}
	   *ast.Ident ident{setId, <nil>}

	- Recv is the type it's being declared for
	- Name is the name, duh
	- Rest is not important here

function calls are more complicated:

	atomic.AddInt64(&lastId, 1) ->

	*ast.CallExpr 0xc000020840 &{0xc00000cb40 744 [0xc00000cb80 0xc00000cba0] 0 755}
	  *ast.SelectorExpr 0xc00000cb40 &{atomic AddInt64}
		*ast.Ident 0xc00000cb00 ident{atomic, <nil>}
		 *ast.Ident 0xc00000cb20 ident{AddInt64, <nil>}
	   *ast.UnaryExpr 0xc00000cb80 &{745 & lastId}
		 *ast.Ident 0xc00000cb60 ident{lastId, &{var lastId 0xc000090140 0 <nil>}}
	   *ast.BasicLit 0xc00000cba0 &{754 INT 1}

	accounts = append(accounts, account) ->

	*ast.CallExpr 0xc0000b57c0 &{append 5267 [accounts account] 0 5285}
	  *ast.Ident 0xc0000b6ec0 ident{append, <nil>}
	  *ast.Ident 0xc0000b6ee0 ident{accounts, &{var accounts 0xc000091b80 0 <nil>}}
	  *ast.Ident 0xc0000b6f00 ident{account, &{var account 0xc0000b4bc0 <nil> <nil>}}