All files / src/repl/completer getMatches.js

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const {flatMap} = require('./flatMap')
 
function getMatches (line, opts, cmd, {only}) {
  const values = justValues(opts)
 
  // 1. If line is empty
  if (line === '') {
    // 1.a. If the command only consists of pos args and the first pos arg has an only value
    // ...
    // 2.b. Else return all args and (the first) pos arg of command
    const matches = summarize(cmd, values)
    return match(matches, line)
  }
 
  const cmdStack = getCmdStack(cmd, values)
  const rest     = getRest(values)
 
  // 2. If last value is not rest
  if (rest === null) {
    const cmd2 = cmdStack[cmdStack.length - 1]
 
    // 2.a. If only is true and last option of last command is invalid (its only does not contain its values)
    if (only && Array.isArray(cmd2.values) && cmd2.values.length > 0) {
      const lastOpt = cmd2.values[cmd2.values.length - 1]
      const rest    = lastOpt.values[lastOpt.values.length - 1]
 
      if (lastOpt.only && !lastOpt.only.includes(rest)) {
        const matches = lastOpt.only.filter(val => val.startsWith(rest))
        return complete(matches, line, rest)
      }
    }
 
    // 2.b. Else show args of last command
    const matches = summarize(cmd2, values)
    return match(matches, line)
  }
 
  // 3. If line ends with "-- " display all command options
  if (line.endsWith('-- ')) {
    const matches = summarize(cmd, values)
    return match(matches, line)
  }
 
  let matches = []
 
  // 4. Check if rest is args in any of the stack commands (from right to left)
  //    -> if args of subcommand, show all its opts
  //    -> if args is option, show its only field or empty if missing
  for (let i = cmdStack.length - 1; i >= 0; i--) {
    const cmd2 = cmdStack[i]
 
    const optsWithRestArg = flatMap(
      cmd2.opts,
      opt => (opt.args || []).includes(rest) ? [opt] : []
    )
 
    if (optsWithRestArg.length > 0) {
      matches = flatMap(optsWithRestArg, opt => {
        Iif (isSubcommand(opt)) return summarize(opt, values)
        else {
          Iif (opt.descArg) return [opt.descArg]
          Eif (only === true && opt.only) return opt.only
          if (opt.types) return [`${(opt.types || []).map(type => '<' + type + '>').join(' ')}`]
          return []
        }
      })
 
      break
    }
  }
 
  if (matches.length > 0) return match(matches, line)
 
  // 5. Check if rest is start of args in any of the stack commands (from right to left)
  //    -> if yes, matches are all right-most args that start with rest
  for (let i = cmdStack.length - 1; i >= 0; i--) {
    const cmd2 = cmdStack[i]
 
    const argsStartingWithRest = flatMap(
      cmd2.opts,
      opt => flatMap(opt.args || [], arg => arg.startsWith(rest) ? [arg] : [])
    )
 
    if (argsStartingWithRest.length > 0) {
      matches = argsStartingWithRest
 
      break
    }
  }
 
  if (matches.length > 0) return complete(matches, line, rest)
 
  // 6. Check if the first positional argument has only values and the rest fits some values from only
  Eif (only === true) {
    const cmd = cmdStack[cmdStack.length - 1]
    const firstPosArg = cmd.opts.find(isPosArg)
 
    Eif (typeof firstPosArg !== 'undefined' && Array.isArray(firstPosArg.only)) {
      matches = firstPosArg.only.filter(value => value !== rest && value.startsWith(rest))
    }
  }
 
  if (matches.length > 0) return complete(matches, line, rest)
 
  // 7. Otherwise
  //    -> Matches are first non-required pos arg of rightmost command without values, or any subcommand of any of the stack commands 
  for (let i = cmdStack.length - 1; i >= 0; i--) {
    const cmd2 = cmdStack[i]
    const args = summarize(cmd2, values)
    matches = [...matches, ...args]
  }
 
  return match(matches, line)
}
 
module.exports = {
  getMatches
}
 
function match (matches, line) {
  if (matches.length === 1) return [[line + ' ' + matches[0]], line]
  return [matches, line]
}
 
function complete (matches, line, rest) {
  if (matches.length === 1) {
    return [
      [line.slice(0, line.length - rest.length) + matches[0]],
      line
    ]
  }
 
  const substr = shortestCommonSubstring(matches)
 
  if (rest !== substr) {
    return [
      [line.slice(0, line.length - rest.length) + substr],
      line
    ]
  }
 
  return [
    matches,
    line.slice(0, line.length - rest.length) + substr
  ]
}
 
function shortestCommonSubstring (matches) {
  Iif (matches.length === 0) return ''
 
  let shortest = matches[0]
  for (let i = 1; i < matches.length; i++) {
    const match = matches[i]
    
    Iif (match.length < shortest.length) {
      shortest = match
    }
  }
 
  let substr = ''
 
  shortestLoop: for (let i = 0; i < shortest.length; i++) {
    const ch = shortest[i]
 
    for (let j = 0; j < matches.length; j++) {
      const match = matches[j]
      const ch2 = match[i]
 
      if (ch !== ch2) break shortestLoop
    }
 
    substr += ch
  }
 
  return substr
}
 
function getCmdStack (cmd, values) {
  let stack = [cmd]
 
  for (let i = values.length - 1; i >= 0; i--) {
    const opt = values[i]
 
    if (isSubcommand(opt)) {
      const stack2 = getCmdStack(opt, opt.values)
      stack = [...stack, ...stack2]
      break
    }
  }
 
  return stack
}
 
function isSubcommand ({opts} = {opts: undefined}) {
  return Array.isArray(opts)
}
 
function getRest (values) {
  if (values.length === 0) return null
 
  const opt = values[values.length - 1]
 
  switch (true) {
    case isSubcommand(opt): return getRest(opt.values || [])
    case isPosArg(opt):     return null
    case isRest(opt):       return opt.values[0]
    default:                return null
  }
}
 
function isPosArg ({key, args}) {
  return typeof key === 'string' && !Array.isArray(args)
}
 
function isRest (opt) {
  return Object.keys(opt).length === 1 && Array.isArray(opt.values) && opt.values.length === 1
}
 
function isVariadic ({types}) {
  return typeof types === 'undefined'
}
 
function summarize (cmd, values) {
  const innerValues = values => {
    if (values.length > 0) {
      if (isSubcommand(values[0])) {
        return innerValues(values[0].values)
      } else {
        return values
      }
    } else {
      return values
    }
  }
 
  const firstEmptyPosArg = (cmd.opts || []).find(
    opt => isPosArg(opt) && (isVariadic(opt) || !innerValues(values).find(({key}) => opt.key === key))
  )
  const options = (cmd.opts || []).filter(opt => !isPosArg(opt))
 
  return flatMap(
    [...options, ...(firstEmptyPosArg ? [firstEmptyPosArg] : [])],
    opt => opt.args ? opt.args : argName(opt)
  )
}
 
function argName ({key, types, only, descArg}) {
  if (Array.isArray(only)) return only
  Iif (typeof descArg === 'string') return [descArg]
  Eif (Array.isArray(types) && types.length > 0) return [types.map(type => `<${type}>`).join(' ')]
  return [`<${key}>`]
}
 
function justValues (opts) {
  return flatMap(opts, opt => {
    if (Array.isArray(opt.values)) {
      if (isSubcommand(opt)) {
        return [{...opt, values: justValues(opt.values)}]
      } else {
        return [opt]
      }
    } else {
      return []
    }
  })
}