Initial Python formatting support

.gitignore

@@ -13,3 +13,5 @@
.DS_Store
coverage
.idea
__pycache__/
*.pyc

.travis.yml

@@ -7,13 +7,23 @@ cache:
  yarn: true
  directories:
  - node_modules
  - /home/travis/.pyenv_cache
env:
  - NODE_ENV=development
  - NODE_ENV=production
matrix:
  fast_finish: true
install:
  - NODE_ENV=development yarn install
before_install:
  - export PYTHON_BUILD_CACHE_PATH="/home/travis/.pyenv_cache"
  - curl -L https://raw.githubusercontent.com/pyenv/pyenv-installer/master/bin/pyenv-installer | bash
  - export PATH="/home/travis/.pyenv/bin:$PATH"
  - eval "$(pyenv init -)"
  - eval "$(pyenv virtualenv-init -)"
  - pyenv install -s 2.7.11
  - pyenv install -s 3.6.3
  - pyenv global 2.7.11 3.6.3
before_script:
  - yarn check-deps
  - if [ "${NODE_ENV}" = "production" ]; then yarn build; fi

scripts/build/build-docs.js

@@ -14,7 +14,8 @@ const parsers = [
  "graphql",
  "postcss",
  "parse5",
  "markdown"
  "markdown",
  "python"
];

function pipe(string) {

scripts/build/build.js

@@ -15,7 +15,8 @@ const parsers = [
  "graphql",
  "postcss",
  "parse5",
  "markdown"
  "markdown",
  "python"
];

process.env.PATH += path.delimiter + path.join(rootDir, "node_modules", ".bin");

src/clean-ast.js

@@ -58,7 +58,9 @@ function massageAST(ast, parent) {
    "trailingComma",
    "parent",
    "prev",
    "position"
    "position",
    "lineno",
    "col_offset"
  ].forEach(name => {
    delete newObj[name];
  });

src/cli-constant.js

@@ -232,7 +232,8 @@ const detailedOptions = normalizeDetailedOptions({
      "scss",
      "json",
      "graphql",
      "markdown"
      "markdown",
      "python"
    ],
    description: "Which parser to use.",
    getter: (value, argv) => (argv["flow-parser"] ? "flow" : value)

src/options.js

@@ -22,7 +22,8 @@ const defaults = {
  requirePragma: false,
  semi: true,
  proseWrap: "preserve",
  arrowParens: "avoid"
  arrowParens: "avoid",
  pythonVersion: ""
};

const exampleConfig = Object.assign({}, defaults, {
@@ -60,6 +61,10 @@ function normalize(options) {
    normalized.trailingComma = "none";
  }

  if (normalized.parser === "python" && !normalized.tabWidth) {
    normalized.tabWidth = 4;
  }

  /* istanbul ignore if */
  if (typeof normalized.trailingComma === "boolean") {
    // Support a deprecated boolean type for the trailing comma config

src/parser-python.js

@@ -0,0 +1,36 @@
"use strict";

const spawnSync = require("child_process").spawnSync;
const path = require("path");

function parseText(text, pythonExecutable) {
  const executionResult = spawnSync(
    pythonExecutable,
    [path.join(__dirname, "../vendor/python/astexport.py")],
    {
      input: text
    }
  );

  const error = executionResult.stderr.toString();

  if (error) {
    throw new Error(error);
  }

  return executionResult;
}

function parse(text, parsers, opts) {
  const pythonExectuable = `python${opts.pythonVersion}`;
  const executionResult = parseText(text, pythonExectuable);

  const ast = JSON.parse(executionResult.stdout.toString());

  // TODO: add comments

  ast.comments = [];
  return ast;
}

module.exports = parse;

src/parser.js

@@ -33,6 +33,9 @@ const parsers = {
  },
  get markdown() {
    return eval("require")("./parser-markdown");
  },
  get python() {
    return eval("require")("./parser-python");
  }
};