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'use strict';
const colors = require('ansi-colors');
const clean = (str = '') => {
return typeof str === 'string' ? str.replace(/^['"]|['"]$/g, '') : '';
};
/**
* This file contains the interpolation and rendering logic for
* the Snippet prompt.
*/
class Item {
constructor(token) {
this.name = token.key;
this.field = token.field || {};
this.value = clean(token.initial || this.field.initial || '');
this.message = token.message || this.name;
this.cursor = 0;
this.input = '';
this.lines = [];
}
}
const tokenize = async(options = {}, defaults = {}, fn = token => token) => {
let unique = new Set();
let fields = options.fields || [];
let input = options.template;
let tabstops = [];
let items = [];
let keys = [];
let line = 1;
if (typeof input === 'function') {
input = await input();
}
let i = -1;
let next = () => input[++i];
let peek = () => input[i + 1];
let push = token => {
token.line = line;
tabstops.push(token);
};
push({ type: 'bos', value: '' });
while (i < input.length - 1) {
let value = next();
if (/^[^\S\n ]$/.test(value)) {
push({ type: 'text', value });
continue;
}
if (value === '\n') {
push({ type: 'newline', value });
line++;
continue;
}
if (value === '\\') {
value += next();
push({ type: 'text', value });
continue;
}
if ((value === '$' || value === '#' || value === '{') && peek() === '{') {
let n = next();
value += n;
let token = { type: 'template', open: value, inner: '', close: '', value };
let ch;
while ((ch = next())) {
if (ch === '}') {
if (peek() === '}') ch += next();
token.value += ch;
token.close = ch;
break;
}
if (ch === ':') {
token.initial = '';
token.key = token.inner;
} else if (token.initial !== void 0) {
token.initial += ch;
}
token.value += ch;
token.inner += ch;
}
token.template = token.open + (token.initial || token.inner) + token.close;
token.key = token.key || token.inner;
if (defaults.hasOwnProperty(token.key)) {
token.initial = defaults[token.key];
}
token = fn(token);
push(token);
keys.push(token.key);
unique.add(token.key);
let item = items.find(item => item.name === token.key);
token.field = fields.find(ch => ch.name === token.key);
if (!item) {
item = new Item(token);
items.push(item);
}
item.lines.push(token.line - 1);
continue;
}
let last = tabstops[tabstops.length - 1];
if (last.type === 'text' && last.line === line) {
last.value += value;
} else {
push({ type: 'text', value });
}
}
push({ type: 'eos', value: '' });
return { input, tabstops, unique, keys, items };
};
module.exports = async prompt => {
let options = prompt.options;
let required = new Set(options.required === true ? [] : (options.required || []));
let defaults = { ...options.values, ...options.initial };
let { tabstops, items, keys } = await tokenize(options, defaults);
let result = createFn('result', prompt, options);
let format = createFn('format', prompt, options);
let isValid = createFn('validate', prompt, options, true);
let isVal = prompt.isValue.bind(prompt);
return async(state = {}, submitted = false) => {
let index = 0;
state.required = required;
state.items = items;
state.keys = keys;
state.output = '';
let validate = async(value, state, item, index) => {
let error = await isValid(value, state, item, index);
if (error === false) {
return 'Invalid field ' + item.name;
}
return error;
};
for (let token of tabstops) {
let value = token.value;
let key = token.key;
if (token.type !== 'template') {
if (value) state.output += value;
continue;
}
if (token.type === 'template') {
let item = items.find(ch => ch.name === key);
if (options.required === true) {
state.required.add(item.name);
}
let val = [item.input, state.values[item.value], item.value, value].find(isVal);
let field = item.field || {};
let message = field.message || token.inner;
if (submitted) {
let error = await validate(state.values[key], state, item, index);
if ((error && typeof error === 'string') || error === false) {
state.invalid.set(key, error);
continue;
}
state.invalid.delete(key);
let res = await result(state.values[key], state, item, index);
state.output += colors.unstyle(res);
continue;
}
item.placeholder = false;
let before = value;
value = await format(value, state, item, index);
if (val !== value) {
state.values[key] = val;
value = prompt.styles.typing(val);
state.missing.delete(message);
} else {
state.values[key] = void 0;
val = `<${message}>`;
value = prompt.styles.primary(val);
item.placeholder = true;
if (state.required.has(key)) {
state.missing.add(message);
}
}
if (state.missing.has(message) && state.validating) {
value = prompt.styles.warning(val);
}
if (state.invalid.has(key) && state.validating) {
value = prompt.styles.danger(val);
}
if (index === state.index) {
if (before !== value) {
value = prompt.styles.underline(value);
} else {
value = prompt.styles.heading(colors.unstyle(value));
}
}
index++;
}
if (value) {
state.output += value;
}
}
let lines = state.output.split('\n').map(l => ' ' + l);
let len = items.length;
let done = 0;
for (let item of items) {
if (state.invalid.has(item.name)) {
item.lines.forEach(i => {
if (lines[i][0] !== ' ') return;
lines[i] = state.styles.danger(state.symbols.bullet) + lines[i].slice(1);
});
}
if (prompt.isValue(state.values[item.name])) {
done++;
}
}
state.completed = ((done / len) * 100).toFixed(0);
state.output = lines.join('\n');
return state.output;
};
};
function createFn(prop, prompt, options, fallback) {
return (value, state, item, index) => {
if (typeof item.field[prop] === 'function') {
return item.field[prop].call(prompt, value, state, item, index);
}
return [fallback, value].find(v => prompt.isValue(v));
};
}