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项目作者： jflex-de

项目描述 ：
Bazel rules to generate java files with JFlex
高级语言： Starlark
项目地址: git://github.com/jflex-de/bazel_rules.git
创建时间： 2018-10-09T08:03:12Z
项目社区：https://github.com/jflex-de/bazel_rules
开源协议：Apache License 2.0
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Bazel rules for JFlex & Cup

This repository offers two rules for projects using the Bazel build system:

  • Rule to generate java source files from a lexer specification, with JFlex

  • Rule to generate java source files from a parser specification, with CUP

Project health

Status of the master branch:

Build status

Disclaimer

This is not an officially supported Google product.

Prepare your Bazel workspace

Add a dependency on rules_jvm_external

See bazelbuild/rules_jvm_external.

Load the jflex rule

Load the bazel_rules in your WORKSPACE file
and add JFLEX_ARTIFACTS in your maven_install rule:

  1. load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
  2. load("@rules_jvm_external//:defs.bzl", "maven_install")
  4. http_archive(
  5.     name = "jflex_rules",
  6.     sha256 = "c4d68bde12f47af86b6f80a34dd55c67e82cf77b7ff2317cb472c07b1d09a6da",
  7.     strip_prefix = "bazel_rules-1.9.1",
  8.     url = "https://github.com/jflex-de/bazel_rules/archive/v1.9.1.tar.gz",
  9. )
  11. load("@jflex_rules//jflex:deps.bzl", "JFLEX_ARTIFACTS")
  13. maven_install(
  14.     name = "maven",
  15.     artifacts = JFLEX_ARTIFACTS,
  16.     maven_install_json = "//:maven_install.json",
  17.     repositories = [
  18.         "https://jcenter.bintray.com/",
  19.         "https://maven.google.com",
  20.         "https://repo1.maven.org/maven2",
  21.     ],
  22. )

If this is the first time you use maven_install, you need to generate the maven_install.json with

  1. bazel run @maven//:pin

If you already used maven_install before, you need to update the pinned artifacts with:

  1. bazel run @unpinned_maven//:pin

Usage in BUILD files

  1. load("@jflex_rules//jflex:jflex.bzl", "jflex")
  2. load("@jflex_rules//cup:cup.bzl", "cup")
  4. jflex(
  5.     name = "",           # Choose a rule name
  6.     srcs = [],           # A list of flex specifications
  7.     outputs = [],        # List of expected generated files
  8. )
  10. cup(
  11.     name = "",           # Choose a rule name
  12.     src = "",            # Grammar specification
  13. )

As usual, these rules can be used as one of the srcs of another rules, such as a java_library.

For more details, see cup and jflex.

Directory layout

  1. ├── assets                 → assets for the web site
  2. ├── cup                    → contains the `cup.bzl` Skylark extension
  3. ├── java                   → main Java source code
  4. │   └── jflex
  5. │       └── examples       → examples
  6. │           ├── calculator → integration of JFlex and CUP
  7. │           └── helloworld → simple lexer
  8. ├── javatests              → tests of the examples
  9. ├── jflex                  → contains the `jflex.bzl` Skylark extension
  10. └── third_party            → Aliases for third-party libraries