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parse.go
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parse.go
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package buildtag
import (
"bytes"
"go/ast"
"go/build/constraint"
goparser "go/parser"
"go/token"
"go/types"
"os"
"strings"
"golang.org/x/tools/go/analysis"
"golang.org/x/tools/go/packages"
)
type parser struct {
fset *token.FileSet
files []*ast.File
otherFiles []string
ignoredFiles []string
pkg *types.Package
}
func newParserFromPass(pass *analysis.Pass) *parser {
return &parser{
fset: pass.Fset,
files: pass.Files,
otherFiles: pass.OtherFiles,
ignoredFiles: pass.IgnoredFiles,
pkg: pass.Pkg,
}
}
func newParserFromPkg(pkg *packages.Package) *parser {
return &parser{
fset: pkg.Fset,
files: pkg.Syntax,
otherFiles: pkg.OtherFiles,
ignoredFiles: pkg.IgnoredFiles,
pkg: pkg.Types,
}
}
func (p *parser) parse(info *Info) error {
for _, f := range p.files {
expr, pos, err := p.parseFile(f)
if err != nil {
return err
}
fname := p.fset.File(f.Pos()).Name()
info.add(p.pkg, fname, pos, expr)
}
for _, fname := range p.otherFiles {
expr, pos, err := p.parseOtherFile(fname)
if err != nil {
return err
}
info.add(p.pkg, fname, pos, expr)
}
for _, fname := range p.ignoredFiles {
if strings.HasSuffix(fname, ".go") {
f, err := goparser.ParseFile(p.fset, fname, nil, goparser.ParseComments)
if err != nil {
continue
}
expr, pos, err := p.parseFile(f)
if err != nil {
return err
}
info.add(p.pkg, fname, pos, expr)
} else {
expr, pos, err := p.parseOtherFile(fname)
if err != nil {
return err
}
info.add(p.pkg, fname, pos, expr)
}
}
return nil
}
func (p *parser) parseFile(file *ast.File) (constraint.Expr, token.Pos, error) {
for _, cg := range file.Comments {
for _, c := range cg.List {
if constraint.IsGoBuild(c.Text) {
expr, err := constraint.Parse(c.Text)
if err != nil {
return nil, token.NoPos, err
}
return expr, c.Pos(), nil
}
}
}
return nil, token.NoPos, nil
}
// copy from golang.org/x/tools/go/analysis/passes/internal/analysisutil/util.go
func (p *parser) readFile(filename string) ([]byte, *token.File, error) {
content, err := os.ReadFile(filename)
if err != nil {
return nil, nil, err
}
tf := p.fset.AddFile(filename, -1, len(content))
tf.SetLinesForContent(content)
return content, tf, nil
}
func (p *parser) parseOtherFile(fname string) (constraint.Expr, token.Pos, error) {
content, tf, err := p.readFile(fname)
if err != nil {
return nil, token.NoPos, err
}
full := content
for len(content) != 0 {
i := bytes.Index(content, []byte("\n"))
if i < 0 {
i = len(content)
} else {
i++
}
offset := len(full) - len(content)
line := strings.TrimSpace(string(content[:i]))
content = content[i:]
if line == "" {
continue
}
if !strings.HasPrefix(line, "//") {
break
}
if constraint.IsGoBuild(line) {
expr, err := constraint.Parse(line)
if err != nil {
return nil, token.NoPos, err
}
return expr, tf.Pos(offset), nil
}
}
return nil, token.NoPos, nil
}