// Copyright 2017 Google Inc. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// soong_javac_wrapper expects a javac command line and argments, executes
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// it, and produces an ANSI colorized version of the output on stdout.
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//
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// It also hides the unhelpful and unhideable "warning there is a warning"
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// messages.
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//
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// Each javac build statement has an order-only dependency on the
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// soong_javac_wrapper tool, which means the javac command will not be rerun
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// if soong_javac_wrapper changes. That means that soong_javac_wrapper must
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// not do anything that will affect the results of the build.
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package main
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import (
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"bufio"
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"fmt"
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"io"
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"os"
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"os/exec"
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"regexp"
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"syscall"
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)
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// Regular expressions are based on
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// https://chromium.googlesource.com/chromium/src/+/master/build/android/gyp/javac.py
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// Colors are based on clang's output
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var (
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filelinePrefix = `^([-.\w/\\]+.java:[0-9]+: )`
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warningRe = regexp.MustCompile(filelinePrefix + `?(warning:) .*$`)
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errorRe = regexp.MustCompile(filelinePrefix + `(.*?:) .*$`)
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markerRe = regexp.MustCompile(`()\s*(\^)\s*$`)
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escape = "\x1b"
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reset = escape + "[0m"
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bold = escape + "[1m"
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red = escape + "[31m"
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green = escape + "[32m"
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magenta = escape + "[35m"
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)
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func main() {
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exitCode, err := Main(os.Stdout, os.Args[0], os.Args[1:])
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if err != nil {
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fmt.Fprintln(os.Stderr, err.Error())
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}
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os.Exit(exitCode)
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}
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func Main(out io.Writer, name string, args []string) (int, error) {
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if len(args) < 1 {
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return 1, fmt.Errorf("usage: %s javac ...", name)
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}
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pr, pw, err := os.Pipe()
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if err != nil {
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return 1, fmt.Errorf("creating output pipe: %s", err)
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}
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cmd := exec.Command(args[0], args[1:]...)
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cmd.Stdin = os.Stdin
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cmd.Stdout = pw
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cmd.Stderr = pw
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err = cmd.Start()
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if err != nil {
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return 1, fmt.Errorf("starting subprocess: %s", err)
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}
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pw.Close()
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// Process subprocess stdout asynchronously
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errCh := make(chan error)
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go func() {
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errCh <- process(pr, out)
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}()
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// Wait for subprocess to finish
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cmdErr := cmd.Wait()
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// Wait for asynchronous stdout processing to finish
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err = <-errCh
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// Check for subprocess exit code
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if cmdErr != nil {
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if exitErr, ok := cmdErr.(*exec.ExitError); ok {
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if status, ok := exitErr.Sys().(syscall.WaitStatus); ok {
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if status.Exited() {
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return status.ExitStatus(), nil
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} else if status.Signaled() {
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exitCode := 128 + int(status.Signal())
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return exitCode, nil
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} else {
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return 1, exitErr
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}
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} else {
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return 1, nil
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}
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}
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}
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if err != nil {
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return 1, err
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}
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return 0, nil
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}
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func process(r io.Reader, w io.Writer) error {
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scanner := bufio.NewScanner(r)
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// Some javac wrappers output the entire list of java files being
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// compiled on a single line, which can be very large, set the maximum
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// buffer size to 2MB.
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scanner.Buffer(nil, 2*1024*1024)
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for scanner.Scan() {
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processLine(w, scanner.Text())
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}
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err := scanner.Err()
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if err != nil {
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return fmt.Errorf("scanning input: %s", err)
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}
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return nil
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}
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func processLine(w io.Writer, line string) {
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for _, f := range filters {
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if f.MatchString(line) {
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return
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}
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}
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for _, p := range colorPatterns {
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var matched bool
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if line, matched = applyColor(line, p.color, p.re); matched {
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break
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}
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}
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fmt.Fprintln(w, line)
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}
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// If line matches re, make it bold and apply color to the first submatch
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// Returns line, modified if it matched, and true if it matched.
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func applyColor(line, color string, re *regexp.Regexp) (string, bool) {
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if m := re.FindStringSubmatchIndex(line); m != nil {
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tagStart, tagEnd := m[4], m[5]
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line = bold + line[:tagStart] +
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color + line[tagStart:tagEnd] + reset + bold +
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line[tagEnd:] + reset
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return line, true
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}
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return line, false
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}
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var colorPatterns = []struct {
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re *regexp.Regexp
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color string
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}{
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{warningRe, magenta},
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{errorRe, red},
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{markerRe, green},
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}
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var filters = []*regexp.Regexp{
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regexp.MustCompile(`Note: (Some input files|.*\.java) uses? or overrides? a deprecated API.`),
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regexp.MustCompile(`Note: Recompile with -Xlint:deprecation for details.`),
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regexp.MustCompile(`Note: (Some input files|.*\.java) uses? unchecked or unsafe operations.`),
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regexp.MustCompile(`Note: Recompile with -Xlint:unchecked for details.`),
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regexp.MustCompile(`bootstrap class path not set in conjunction with -source`),
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regexp.MustCompile(`javadoc: warning - The old Doclet and Taglet APIs in the packages`),
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regexp.MustCompile(`com.sun.javadoc, com.sun.tools.doclets and their implementations`),
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regexp.MustCompile(`are planned to be removed in a future JDK release. These`),
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regexp.MustCompile(`components have been superseded by the new APIs in jdk.javadoc.doclet.`),
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regexp.MustCompile(`Users are strongly recommended to migrate to the new APIs.`),
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regexp.MustCompile(`javadoc: option --boot-class-path not allowed with target 1.9`),
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}
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