mirror of
https://github.com/golang/go
synced 2024-10-01 07:28:35 -06:00
01f8cd246d
They will be deleted from their current homes once this has landed. Changes made to import paths to make the code compile, and to find errchk in the right place in cmd/vet's Makefile. TODO in a later CL: tidy up vet. R=golang-dev, gri CC=golang-dev https://golang.org/cl/9495043
92 lines
2.3 KiB
Go
92 lines
2.3 KiB
Go
// Copyright 2013 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 main
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import (
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"bytes"
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"fmt"
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"os"
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"strings"
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"unicode"
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)
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var (
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nl = []byte("\n")
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slashSlash = []byte("//")
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plusBuild = []byte("+build")
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)
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// checkBuildTag checks that build tags are in the correct location and well-formed.
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func checkBuildTag(name string, data []byte) {
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if !vet("buildtags") {
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return
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}
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lines := bytes.SplitAfter(data, nl)
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// Determine cutpoint where +build comments are no longer valid.
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// They are valid in leading // comments in the file followed by
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// a blank line.
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var cutoff int
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for i, line := range lines {
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line = bytes.TrimSpace(line)
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if len(line) == 0 {
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cutoff = i
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continue
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}
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if bytes.HasPrefix(line, slashSlash) {
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continue
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}
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break
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}
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for i, line := range lines {
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line = bytes.TrimSpace(line)
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if !bytes.HasPrefix(line, slashSlash) {
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continue
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}
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text := bytes.TrimSpace(line[2:])
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if bytes.HasPrefix(text, plusBuild) {
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fields := bytes.Fields(text)
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if !bytes.Equal(fields[0], plusBuild) {
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// Comment is something like +buildasdf not +build.
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fmt.Fprintf(os.Stderr, "%s:%d: possible malformed +build comment\n", name, i+1)
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continue
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}
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if i >= cutoff {
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fmt.Fprintf(os.Stderr, "%s:%d: +build comment appears too late in file\n", name, i+1)
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setExit(1)
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continue
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}
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// Check arguments.
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Args:
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for _, arg := range fields[1:] {
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for _, elem := range strings.Split(string(arg), ",") {
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if strings.HasPrefix(elem, "!!") {
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fmt.Fprintf(os.Stderr, "%s:%d: invalid double negative in build constraint: %s\n", name, i+1, arg)
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setExit(1)
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break Args
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}
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if strings.HasPrefix(elem, "!") {
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elem = elem[1:]
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}
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for _, c := range elem {
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if !unicode.IsLetter(c) && !unicode.IsDigit(c) && c != '_' && c != '.' {
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fmt.Fprintf(os.Stderr, "%s:%d: invalid non-alphanumeric build constraint: %s\n", name, i+1, arg)
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setExit(1)
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break Args
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}
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}
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}
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}
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continue
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}
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// Comment with +build but not at beginning.
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if bytes.Contains(line, plusBuild) && i < cutoff {
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fmt.Fprintf(os.Stderr, "%s:%d: possible malformed +build comment\n", name, i+1)
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continue
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}
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}
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}
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