RegularExpressionTest.ts

import assert from 'assert'
import fs from 'fs'
import glob from 'glob'
import yaml from 'js-yaml'

import ParameterTypeRegistry from '../src/ParameterTypeRegistry.js'
import RegularExpression from '../src/RegularExpression.js'
import { testDataDir } from './testDataDir.js'

interface Expectation {
  expression: string
  text: string
  expected_args: string
}

describe('RegularExpression', () => {
<<<<<<< HEAD
  it('documents match arguments', () => {
    const parameterRegistry = new ParameterTypeRegistry()

    const expr = /I have (\d+) cukes? in my (\w+) now/
    const expression = new RegularExpression(expr, parameterRegistry)
    const args = expression.match('I have 7 cukes in my belly now')!
    assert.strictEqual(7, args[0].getValue(null))
    assert.strictEqual('belly', args[1].getValue(null))
  })
=======
  for (const path of glob.sync(`${testDataDir}/regular-expression/matching/*.yaml`)) {
    const expectation = yaml.load(fs.readFileSync(path, 'utf-8')) as Expectation
    it(`matches ${path}`, () => {
      const parameterTypeRegistry = new ParameterTypeRegistry()
      const expression = new RegularExpression(
        new RegExp(expectation.expression),
        parameterTypeRegistry
      )
      const matches = expression.match(expectation.text)
      assert.deepStrictEqual(
        JSON.parse(JSON.stringify(matches ? matches.map((value) => value.getValue(null)) : null)), // Removes type information.
        expectation.expected_args
      )
    })
  }
>>>>>>> main

  it('does no transform by default', () => {
    assert.deepStrictEqual(match(/(\d\d)/, '22'), ['22'])
  })

  it('does not transform anonymous', () => {
    assert.deepStrictEqual(match(/(.*)/, '22'), ['22'])
  })

  it('transforms negative int', () => {
    assert.deepStrictEqual(match(/(-?\d+)/, '-22'), [-22])
  })

  it('transforms positive int', () => {
    assert.deepStrictEqual(match(/(\d+)/, '22'), [22])
  })

  it('transforms float without integer part', () => {
    assert.deepStrictEqual(
      match(new RegExp(`(${ParameterTypeRegistry.FLOAT_REGEXP.source})`), '.22'),
      [0.22]
    )
  })

  it('transforms float with sign', () => {
    assert.deepStrictEqual(
      match(new RegExp(`(${ParameterTypeRegistry.FLOAT_REGEXP.source})`), '-1.22'),
      [-1.22]
    )
  })

  it('returns null when there is no match', () => {
    assert.strictEqual(match(/hello/, 'world'), null)
  })

  it('matches empty string', () => {
    assert.deepStrictEqual(match(/^The value equals "([^"]*)"$/, 'The value equals ""'), [''])
  })

  it('matches nested capture group without match', () => {
    assert.deepStrictEqual(match(/^a user( named "([^"]*)")?$/, 'a user'), [null])
  })

  it('matches nested capture group with match', () => {
    assert.deepStrictEqual(match(/^a user( named "([^"]*)")?$/, 'a user named "Charlie"'), [
      'Charlie',
    ])
  })

  it('matches capture group nested in optional one', () => {
    const regexp =
      /^a (pre-commercial transaction |pre buyer fee model )?purchase(?: for \$(\d+))?$/
    assert.deepStrictEqual(match(regexp, 'a purchase'), [null, null])
    assert.deepStrictEqual(match(regexp, 'a purchase for $33'), [null, 33])
    assert.deepStrictEqual(match(regexp, 'a pre buyer fee model purchase'), [
      'pre buyer fee model ',
      null,
    ])
  })

  it('ignores non capturing groups', () => {
    assert.deepStrictEqual(
      match(
        /(\S+) ?(can|cannot)? (?:delete|cancel) the (\d+)(?:st|nd|rd|th) (attachment|slide) ?(?:upload)?/,
        'I can cancel the 1st slide upload'
      ),
      ['I', 'can', 1, 'slide']
    )
  })

  it('works with escaped parenthesis', () => {
    assert.deepStrictEqual(match(/Across the line\(s\)/, 'Across the line(s)'), [])
  })

  it('exposes regexp and source', () => {
    const regexp = /I have (\d+) cukes? in my (.+) now/
    const expression = new RegularExpression(regexp, new ParameterTypeRegistry())
    assert.deepStrictEqual(expression.regexp, regexp)
    assert.deepStrictEqual(expression.source, regexp.source)
  })

  it('does not take consider parenthesis in character class as group', function () {
    const expression = new RegularExpression(
      /^drawings: ([A-Z_, ()]+)$/,
      new ParameterTypeRegistry()
    )
    const args = expression.match('drawings: ONE, TWO(ABC)')!

    assert.strictEqual(args[0].getValue(this), 'ONE, TWO(ABC)')
  })
})

const match = (regexp: RegExp, text: string) => {
  const parameterRegistry = new ParameterTypeRegistry()
  const regularExpression = new RegularExpression(regexp, parameterRegistry)
  const args = regularExpression.match(text)
  if (!args) {
    return null
  }
  return args.map((arg) => arg.getValue(null))
}