basant307/AI_Governance_Project

1'use strict';2 3const color = require('kleur');4 5const _require = require('sisteransi'),6      cursor = _require.cursor;7 8const Prompt = require('./prompt');9 10const _require2 = require('../util'),11      clear = _require2.clear,12      figures = _require2.figures,13      style = _require2.style,14      wrap = _require2.wrap,15      entriesToDisplay = _require2.entriesToDisplay;16/**17 * MultiselectPrompt Base Element18 * @param {Object} opts Options19 * @param {String} opts.message Message20 * @param {Array} opts.choices Array of choice objects21 * @param {String} [opts.hint] Hint to display22 * @param {String} [opts.warn] Hint shown for disabled choices23 * @param {Number} [opts.max] Max choices24 * @param {Number} [opts.cursor=0] Cursor start position25 * @param {Number} [opts.optionsPerPage=10] Max options to display at once26 * @param {Stream} [opts.stdin] The Readable stream to listen to27 * @param {Stream} [opts.stdout] The Writable stream to write readline data to28 */29 30 31class MultiselectPrompt extends Prompt {32  constructor(opts = {}) {33    super(opts);34    this.msg = opts.message;35    this.cursor = opts.cursor || 0;36    this.scrollIndex = opts.cursor || 0;37    this.hint = opts.hint || '';38    this.warn = opts.warn || '- This option is disabled -';39    this.minSelected = opts.min;40    this.showMinError = false;41    this.maxChoices = opts.max;42    this.instructions = opts.instructions;43    this.optionsPerPage = opts.optionsPerPage || 10;44    this.value = opts.choices.map((ch, idx) => {45      if (typeof ch === 'string') ch = {46        title: ch,47        value: idx48      };49      return {50        title: ch && (ch.title || ch.value || ch),51        description: ch && ch.description,52        value: ch && (ch.value === undefined ? idx : ch.value),53        selected: ch && ch.selected,54        disabled: ch && ch.disabled55      };56    });57    this.clear = clear('', this.out.columns);58 59    if (!opts.overrideRender) {60      this.render();61    }62  }63 64  reset() {65    this.value.map(v => !v.selected);66    this.cursor = 0;67    this.fire();68    this.render();69  }70 71  selected() {72    return this.value.filter(v => v.selected);73  }74 75  exit() {76    this.abort();77  }78 79  abort() {80    this.done = this.aborted = true;81    this.fire();82    this.render();83    this.out.write('\n');84    this.close();85  }86 87  submit() {88    const selected = this.value.filter(e => e.selected);89 90    if (this.minSelected && selected.length < this.minSelected) {91      this.showMinError = true;92      this.render();93    } else {94      this.done = true;95      this.aborted = false;96      this.fire();97      this.render();98      this.out.write('\n');99      this.close();100    }101  }102 103  first() {104    this.cursor = 0;105    this.render();106  }107 108  last() {109    this.cursor = this.value.length - 1;110    this.render();111  }112 113  next() {114    this.cursor = (this.cursor + 1) % this.value.length;115    this.render();116  }117 118  up() {119    if (this.cursor === 0) {120      this.cursor = this.value.length - 1;121    } else {122      this.cursor--;123    }124 125    this.render();126  }127 128  down() {129    if (this.cursor === this.value.length - 1) {130      this.cursor = 0;131    } else {132      this.cursor++;133    }134 135    this.render();136  }137 138  left() {139    this.value[this.cursor].selected = false;140    this.render();141  }142 143  right() {144    if (this.value.filter(e => e.selected).length >= this.maxChoices) return this.bell();145    this.value[this.cursor].selected = true;146    this.render();147  }148 149  handleSpaceToggle() {150    const v = this.value[this.cursor];151 152    if (v.selected) {153      v.selected = false;154      this.render();155    } else if (v.disabled || this.value.filter(e => e.selected).length >= this.maxChoices) {156      return this.bell();157    } else {158      v.selected = true;159      this.render();160    }161  }162 163  toggleAll() {164    if (this.maxChoices !== undefined || this.value[this.cursor].disabled) {165      return this.bell();166    }167 168    const newSelected = !this.value[this.cursor].selected;169    this.value.filter(v => !v.disabled).forEach(v => v.selected = newSelected);170    this.render();171  }172 173  _(c, key) {174    if (c === ' ') {175      this.handleSpaceToggle();176    } else if (c === 'a') {177      this.toggleAll();178    } else {179      return this.bell();180    }181  }182 183  renderInstructions() {184    if (this.instructions === undefined || this.instructions) {185      if (typeof this.instructions === 'string') {186        return this.instructions;187      }188 189      return '\nInstructions:\n' + `    ${figures.arrowUp}/${figures.arrowDown}: Highlight option\n` + `    ${figures.arrowLeft}/${figures.arrowRight}/[space]: Toggle selection\n` + (this.maxChoices === undefined ? `    a: Toggle all\n` : '') + `    enter/return: Complete answer`;190    }191 192    return '';193  }194 195  renderOption(cursor, v, i, arrowIndicator) {196    const prefix = (v.selected ? color.green(figures.radioOn) : figures.radioOff) + ' ' + arrowIndicator + ' ';197    let title, desc;198 199    if (v.disabled) {200      title = cursor === i ? color.gray().underline(v.title) : color.strikethrough().gray(v.title);201    } else {202      title = cursor === i ? color.cyan().underline(v.title) : v.title;203 204      if (cursor === i && v.description) {205        desc = ` - ${v.description}`;206 207        if (prefix.length + title.length + desc.length >= this.out.columns || v.description.split(/\r?\n/).length > 1) {208          desc = '\n' + wrap(v.description, {209            margin: prefix.length,210            width: this.out.columns211          });212        }213      }214    }215 216    return prefix + title + color.gray(desc || '');217  } // shared with autocompleteMultiselect218 219 220  paginateOptions(options) {221    if (options.length === 0) {222      return color.red('No matches for this query.');223    }224 225    let _entriesToDisplay = entriesToDisplay(this.cursor, options.length, this.optionsPerPage),226        startIndex = _entriesToDisplay.startIndex,227        endIndex = _entriesToDisplay.endIndex;228 229    let prefix,230        styledOptions = [];231 232    for (let i = startIndex; i < endIndex; i++) {233      if (i === startIndex && startIndex > 0) {234        prefix = figures.arrowUp;235      } else if (i === endIndex - 1 && endIndex < options.length) {236        prefix = figures.arrowDown;237      } else {238        prefix = ' ';239      }240 241      styledOptions.push(this.renderOption(this.cursor, options[i], i, prefix));242    }243 244    return '\n' + styledOptions.join('\n');245  } // shared with autocomleteMultiselect246 247 248  renderOptions(options) {249    if (!this.done) {250      return this.paginateOptions(options);251    }252 253    return '';254  }255 256  renderDoneOrInstructions() {257    if (this.done) {258      return this.value.filter(e => e.selected).map(v => v.title).join(', ');259    }260 261    const output = [color.gray(this.hint), this.renderInstructions()];262 263    if (this.value[this.cursor].disabled) {264      output.push(color.yellow(this.warn));265    }266 267    return output.join(' ');268  }269 270  render() {271    if (this.closed) return;272    if (this.firstRender) this.out.write(cursor.hide);273    super.render(); // print prompt274 275    let prompt = [style.symbol(this.done, this.aborted), color.bold(this.msg), style.delimiter(false), this.renderDoneOrInstructions()].join(' ');276 277    if (this.showMinError) {278      prompt += color.red(`You must select a minimum of ${this.minSelected} choices.`);279      this.showMinError = false;280    }281 282    prompt += this.renderOptions(this.value);283    this.out.write(this.clear + prompt);284    this.clear = clear(prompt, this.out.columns);285  }286 287}288 289module.exports = MultiselectPrompt;