mirror of
https://github.com/autc04/Retro68.git
synced 2024-09-08 20:55:01 +00:00
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// Determine cutpoint where +build comments are no longer valid.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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setExit(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 must appear before package clause and be followed by a blank line\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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elem = strings.TrimPrefix(elem, "!")
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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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setExit(1)
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continue
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}
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}
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}
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