下面的C预处理器行标记是否有任何Bash或Python正则表达式？
C预处理器输出行标记如下：
# 74 "a/b/some_file.c" 3 4
首先是符号 - ＃ 空间 然后行号 - 74 空间 然后 - ＆＃34;文件路径＆＃34; 空间 然后由空格分隔的零个或多个整数 - 3 4
更多信息：
https://gcc.gnu.org/onlinedocs/gcc-6.4.0/cpp/Preprocessor-Output.html
答案 0 :(得分：1)
我不知道你希望Bash匹配这些行，而Python无疑可以用它的正则表达式来实现。我有一个#line脚本，用于将#!/bin/sh
#
# @(#)$Id: linecomments.sh,v 1.3 2018/01/05 05:12:10 jleffler Exp $
#
# Convert #line directives into comments
# Deals with four forms of the #line directive:
# # line 99 "file"
# # line 99
# # 99 "file"
# # 99
exec sed \
-e 's%^[[:space:]]*#[[:space:]]*line[[:space:]][0-9][0-9]*[[:space:]].*%/*&*/%' \
-e 's%^[[:space:]]*#[[:space:]]*[0-9][0-9]*[[:space:]].*%/*&*/%' \
-e 's%^[[:space:]]*#[[:space:]]*line[[:space:]][0-9][0-9]*$%/*&*/%' \
-e 's%^[[:space:]]*#[[:space:]]*[0-9][0-9]*$%/*&*/%' \
"$@"
指令转换为注释（有时可以使调试预处理代码更容易）。它看起来像这样：
%我使用/*来分隔正则表达式，因为我在替换文本中需要*/和[ ]。正则表达式匹配“尾随垃圾”＃39;例如GCC发出的额外数字。
2018年的编辑用[[:space:]]替换了看起来像Counting objects: 3, done.
Delta compression using up to 6 threads.
Compressing objects: 100% (3/3), done.
Writing objects: 100% (3/3), 336 bytes | 336.00 KiB/s, done.
Total 3 (delta 2), reused 0 (delta 0)
remote: Compressing source files... done.
remote: Building source:
remote:
remote: -----> Ruby app detected
remote: -----> Compiling Ruby/Rails
remote: -----> Using Ruby version: ruby-2.3.4
remote: ###### WARNING:
remote: Removing `Gemfile.lock` because it was generated on Windows.
remote: Bundler will do a full resolve so native gems are handled
properly.
remote: This may result in unexpected gem versions being used in your
app.
remote: In rare occasions Bundler may not be able to resolve your
dependencies at all.
remote: https://devcenter.heroku.com/articles/bundler-windows-gemfile
remote:
remote: -----> Installing dependencies using bundler 1.15.2
remote: Running: bundle install --without development:test --path
vendor/bundle --binstubs vendor/bundle/bin -j4
remote: The dependency tzinfo-data (>= 0) will be unused by any of
the platforms Bundler is installing for. Bundler is installing for ruby but
the dependency is only for x86-mingw32, x86-mswin32, x64-mingw32, java. To
add those platforms to the bundle, run `bundle lock --add-platform x86-
mingw32 x86-mswin32 x64-mingw32 java`.
remote: Fetching gem metadata from https://rubygems.org/..........
remote: Fetching version metadata from https://rubygems.org/..
remote: Fetching dependency metadata from https://rubygems.org/.
remote: Resolving dependencies...
remote: Using rake 12.3.0
remote: Using concurrent-ruby 1.0.5
remote: Using minitest 5.11.3
remote: Using thread_safe 0.3.6
remote: Using builder 3.2.3
remote: Using erubi 1.7.0
remote: Using mini_portile2 2.3.0
remote: Using crass 1.0.3
remote: Using rack 2.0.4
remote: Using nio4r 2.2.0
remote: Using websocket-extensions 0.1.3
remote: Using mini_mime 1.0.0
remote: Using arel 8.0.0
remote: Using bundler 1.15.2
remote: Using coffee-script-source 1.12.2
remote: Using execjs 2.7.0
remote: Using method_source 0.9.0
remote: Using thor 0.20.0
remote: Using ffi 1.9.21
remote: Using multi_json 1.13.1
remote: Fetching pg 0.17.1
remote: Using puma 3.11.2
remote: Using rails_serve_static_assets 0.0.5
remote: Using rails_stdout_logging 0.0.5
remote: Using rb-fsevent 0.10.2
remote: Using tilt 2.0.8
remote: Using turbolinks-source 5.1.0
remote: Using i18n 0.9.3
remote: Using tzinfo 1.2.5
remote: Using nokogiri 1.8.2
remote: Using websocket-driver 0.6.5
remote: Using rack-test 0.8.2
remote: Using sprockets 3.7.1
remote: Using mail 2.7.0
remote: Using uglifier 4.1.5
remote: Using coffee-script 2.4.1
remote: Using rb-inotify 0.9.10
remote: Fetching rails_12factor 0.0.2
remote: Using turbolinks 5.1.0
remote: Using activesupport 5.1.4
remote: Using loofah 2.1.1
remote: Using sass-listen 4.0.0
remote: Using rails-dom-testing 2.0.3
remote: Using globalid 0.4.1
remote: Using activemodel 5.1.4
remote: Using jbuilder 2.7.0
remote: Using rails-html-sanitizer 1.0.3
remote: Using sass 3.5.5
remote: Using activejob 5.1.4
remote: Using activerecord 5.1.4
remote: Using actionview 5.1.4
remote: Using actionpack 5.1.4
remote: Using actioncable 5.1.4
remote: Using actionmailer 5.1.4
remote: Using railties 5.1.4
remote: Using sprockets-rails 3.2.1
remote: Using coffee-rails 4.2.2
remote: Using rails 5.1.4
remote: Using sass-rails 5.0.7
remote: Installing pg 0.17.1 with native extensions
remote: Installing rails_12factor 0.0.2
remote: Bundle complete! 15 Gemfile dependencies, 59 gems now installed.
remote: Gems in the groups development and test were not installed.
remote: Bundled gems are installed into ./vendor/bundle.
remote: Bundle completed (9.84s)
remote: Cleaning up the bundler cache.
remote: Removing pg (1.0.0)
remote: Removing rails_12factor (0.0.3)
remote: The latest bundler is 1.16.1, but you are currently running 1.15.2.
remote: To update, run `gem install bundler`
remote: -----> Installing node-v6.11.1-linux-x64
remote: -----> Detecting rake tasks
remote: -----> Preparing app for Rails asset pipeline
remote: Running: rake assets:precompile
remote: Yarn executable was not detected in the system.
remote: Download Yarn at https://yarnpkg.com/en/docs/install
remote: Asset precompilation completed (1.55s)
remote: Cleaning assets
remote: Running: rake assets:clean
remote:
remote: ###### WARNING:
remote: Removing `Gemfile.lock` because it was generated on Windows.
remote: Bundler will do a full resolve so native gems are handled properly.
remote: This may result in unexpected gem versions being used in your app.
remote: In rare occasions Bundler may not be able to resolve your dependencies at all.
remote: https://devcenter.heroku.com/articles/bundler-windows-gemfile
remote:
remote: ###### WARNING:
remote: No Procfile detected, using the default web server.
remote: We recommend explicitly declaring how to boot your server process via a Procfile.
remote: https://devcenter.heroku.com/articles/ruby-default-web-server
remote:
remote: -----> Discovering process types
remote: Procfile declares types -> (none)
remote: Default types for buildpack -> console, rake, web, worker
remote:
remote: -----> Compressing...
remote: Done: 37.4M
remote: -----> Launching...
remote: Released v9
remote: https://coolguygear.herokuapp.com/ deployed to Heroku
remote:
remote: Verifying deploy... done.
To https://git.heroku.com/coolguygear.git
69e3355..ce67809 master -> master
C:\Users\Jared\testapp>
的片段 - 旧代码（2001年）在每种情况下都使用了空格和制表符。这更清楚;您可以复制“粘贴”，而无需担心标签的位置。