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ast_package.go
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/
ast_package.go
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package main
import (
"fmt"
"go/ast"
"go/types"
"log"
"strings"
"golang.org/x/tools/go/packages"
)
// Package holds a single parsed package and associated files and ast files.
type Package struct {
// Name is the package name as it appears in the package source code.
name string
// Defs maps identifiers to the objects they define (including
// package names, dots "." of dot-imports, and blank "_" identifiers).
// For identifiers that do not denote objects (e.g., the package name
// in package clauses, or symbolic variables t in t := x.(type) of
// type switch headers), the corresponding objects are nil.
//
// For an embedded field, Defs returns the field *Var it defines.
//
// Invariant: Defs[id] == nil || Defs[id].Pos() == id.Pos()
defs map[*ast.Ident]types.Object
// Ast files to which this package contains.
files []*File
}
// parsePackage analyzes the single package constructed from the patterns and tags.
// parsePackage exits if there is an error.
func (g *Generator) parsePackage(patterns []string, tags []string) {
cfg := &packages.Config{
Mode: packages.LoadSyntax,
// TODO: Need to think about constants in test files. Maybe write type_string_test.go
// in a separate pass? For later.
Tests: false,
BuildFlags: []string{fmt.Sprintf("-tags=%s", strings.Join(tags, " "))},
}
pkgs, err := packages.Load(cfg, patterns...)
if err != nil {
log.Fatal(err)
}
if len(pkgs) != 1 {
log.Fatalf("error: %d packages found", len(pkgs))
}
g.addPackage(pkgs[0])
}
// addPackage adds a type checked Package and its syntax files to the generator.
func (g *Generator) addPackage(pkg *packages.Package) {
g.pkg = &Package{
name: pkg.Name,
defs: pkg.TypesInfo.Defs,
files: make([]*File, len(pkg.Syntax)),
}
for i, file := range pkg.Syntax {
g.pkg.files[i] = &File{
file: file,
pkg: g.pkg,
trimPrefix: g.trimPrefix,
lineComment: g.lineComment,
}
}
}