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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [go/] [go/] [ast/] [import.go] - Blame information for rev 747

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1 747 jeremybenn 
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package ast
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import (
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        "go/token"
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        "sort"
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        "strconv"
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)
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// SortImports sorts runs of consecutive import lines in import blocks in f.
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func SortImports(fset *token.FileSet, f *File) {
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        for _, d := range f.Decls {
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                d, ok := d.(*GenDecl)
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                if !ok || d.Tok != token.IMPORT {
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                        // Not an import declaration, so we're done.
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                        // Imports are always first.
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                        break
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                }
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                if d.Lparen == token.NoPos {
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                        // Not a block: sorted by default.
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                        continue
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                }
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                // Identify and sort runs of specs on successive lines.
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                i := 0
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                for j, s := range d.Specs {
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                        if j > i && fset.Position(s.Pos()).Line > 1+fset.Position(d.Specs[j-1].End()).Line {
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                                // j begins a new run.  End this one.
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                                sortSpecs(fset, f, d.Specs[i:j])
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                                i = j
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                        }
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                }
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                sortSpecs(fset, f, d.Specs[i:])
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        }
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}
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func importPath(s Spec) string {
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        t, err := strconv.Unquote(s.(*ImportSpec).Path.Value)
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        if err == nil {
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                return t
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        }
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        return ""
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}
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type posSpan struct {
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        Start token.Pos
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        End   token.Pos
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}
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func sortSpecs(fset *token.FileSet, f *File, specs []Spec) {
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        // Avoid work if already sorted (also catches < 2 entries).
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        sorted := true
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        for i, s := range specs {
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                if i > 0 && importPath(specs[i-1]) > importPath(s) {
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                        sorted = false
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                        break
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                }
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        }
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        if sorted {
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                return
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        }
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        // Record positions for specs.
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        pos := make([]posSpan, len(specs))
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        for i, s := range specs {
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                pos[i] = posSpan{s.Pos(), s.End()}
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        }
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        // Identify comments in this range.
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        // Any comment from pos[0].Start to the final line counts.
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        lastLine := fset.Position(pos[len(pos)-1].End).Line
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        cstart := len(f.Comments)
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        cend := len(f.Comments)
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        for i, g := range f.Comments {
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                if g.Pos() < pos[0].Start {
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                        continue
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                }
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                if i < cstart {
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                        cstart = i
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                }
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                if fset.Position(g.End()).Line > lastLine {
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                        cend = i
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                        break
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                }
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        }
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        comments := f.Comments[cstart:cend]
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        // Assign each comment to the import spec preceding it.
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        importComment := map[*ImportSpec][]*CommentGroup{}
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        specIndex := 0
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        for _, g := range comments {
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                for specIndex+1 < len(specs) && pos[specIndex+1].Start <= g.Pos() {
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                        specIndex++
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                }
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                s := specs[specIndex].(*ImportSpec)
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                importComment[s] = append(importComment[s], g)
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        }
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        // Sort the import specs by import path.
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        // Reassign the import paths to have the same position sequence.
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        // Reassign each comment to abut the end of its spec.
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        // Sort the comments by new position.
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        sort.Sort(byImportPath(specs))
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        for i, s := range specs {
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                s := s.(*ImportSpec)
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                if s.Name != nil {
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                        s.Name.NamePos = pos[i].Start
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                }
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                s.Path.ValuePos = pos[i].Start
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                s.EndPos = pos[i].End
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                for _, g := range importComment[s] {
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                        for _, c := range g.List {
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                                c.Slash = pos[i].End
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                        }
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                }
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        }
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        sort.Sort(byCommentPos(comments))
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}
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type byImportPath []Spec // slice of *ImportSpec
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func (x byImportPath) Len() int           { return len(x) }
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func (x byImportPath) Swap(i, j int)      { x[i], x[j] = x[j], x[i] }
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func (x byImportPath) Less(i, j int) bool { return importPath(x[i]) < importPath(x[j]) }
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type byCommentPos []*CommentGroup
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func (x byCommentPos) Len() int           { return len(x) }
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func (x byCommentPos) Swap(i, j int)      { x[i], x[j] = x[j], x[i] }
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func (x byCommentPos) Less(i, j int) bool { return x[i].Pos() < x[j].Pos() }

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