All files / src/repl/completer getMatches.js

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const {flatMap} = require('./flatMap')
 
function getMatches (line, values, cmd, {only}) {
  // 1. If line is empty, return all args and pos arg of command
  if (line === '') {
    const matches = summarize(cmd)
    return match(matches, line)
  }
 
  const cmdStack = getCmdStack(cmd, values)
  const rest     = getRest(values)
console.log('2.')
  // 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)
    Eif (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)
    return match(matches, line)
  }
console.log('3.')
  // 3. If line ends with "-- " display all command options
  if (line.endsWith('-- ')) {
    const matches = summarize(cmd)
    return match(matches, line)
  }
 
  let matches = []
console.log('4.')
  // 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)
        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)
console.log('5.')
  // 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)
console.log('6.')
  // 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)
console.log('7.')
  // 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)
    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) { console.log('values', values)
  Iif (values.length === 0) return null
 
  const opt = values[values.length - 1]
 
  switch (true) {
    case isSubcommand(opt): console.log('isSubcommand'); return getRest(opt.values || [])
    case isPosArg(opt):     console.log('isPosArg'); return null // opt.values[0]
    case isRest(opt):       console.log('isRest'); return opt.values[0]
    default:                console.log('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 summarize (cmd) {
  return flatMap(cmd.opts || [], opt => opt.args ? opt.args : argName(opt))
}
 
function argName ({key, types, only, descArg}) {
  if (Array.isArray(only)) return only
  if (typeof descArg === 'string') return [descArg]
  Eif (Array.isArray(types) && types.length > 0) return [types.map(type => `<${type}>`).join(' ')]
  return [`<${key}>`]
}