forked from M3-Academy/challenge-algorithms-v2.0
133 lines
3.6 KiB
JavaScript
133 lines
3.6 KiB
JavaScript
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'use strict';
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Object.defineProperty(exports, '__esModule', {
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value: true
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});
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exports.dedentLines = void 0;
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/**
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* Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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const getIndentationLength = line => {
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const result = /^( {2})+/.exec(line);
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return result === null ? 0 : result[0].length;
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};
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const dedentLine = line => line.slice(getIndentationLength(line));
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// Return true if:
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// "key": "value has multiple lines\n…
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// "key has multiple lines\n…
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const hasUnmatchedDoubleQuoteMarks = string => {
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let n = 0;
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let i = string.indexOf('"', 0);
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while (i !== -1) {
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if (i === 0 || string[i - 1] !== '\\') {
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n += 1;
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}
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i = string.indexOf('"', i + 1);
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}
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return n % 2 !== 0;
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};
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const isFirstLineOfTag = line => /^( {2})*</.test(line);
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// The length of the output array is the index of the next input line.
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// Push dedented lines of start tag onto output and return true;
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// otherwise return false because:
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// * props include a multiline string (or text node, if props have markup)
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// * start tag does not close
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const dedentStartTag = (input, output) => {
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let line = input[output.length];
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output.push(dedentLine(line));
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if (line.includes('>')) {
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return true;
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}
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while (output.length < input.length) {
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line = input[output.length];
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if (hasUnmatchedDoubleQuoteMarks(line)) {
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return false; // because props include a multiline string
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} else if (isFirstLineOfTag(line)) {
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// Recursion only if props have markup.
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if (!dedentMarkup(input, output)) {
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return false;
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}
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} else {
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output.push(dedentLine(line));
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if (line.includes('>')) {
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return true;
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}
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}
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}
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return false;
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};
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// Push dedented lines of markup onto output and return true;
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// otherwise return false because:
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// * props include a multiline string
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// * text has more than one adjacent line
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// * markup does not close
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const dedentMarkup = (input, output) => {
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let line = input[output.length];
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if (!dedentStartTag(input, output)) {
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return false;
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}
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if (input[output.length - 1].includes('/>')) {
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return true;
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}
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let isText = false;
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const stack = [];
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stack.push(getIndentationLength(line));
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while (stack.length > 0 && output.length < input.length) {
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line = input[output.length];
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if (isFirstLineOfTag(line)) {
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if (line.includes('</')) {
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output.push(dedentLine(line));
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stack.pop();
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} else {
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if (!dedentStartTag(input, output)) {
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return false;
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}
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if (!input[output.length - 1].includes('/>')) {
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stack.push(getIndentationLength(line));
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}
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}
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isText = false;
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} else {
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if (isText) {
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return false; // because text has more than one adjacent line
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}
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const indentationLengthOfTag = stack[stack.length - 1];
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output.push(line.slice(indentationLengthOfTag + 2));
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isText = true;
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}
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}
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return stack.length === 0;
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};
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// Return lines unindented by heuristic;
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// otherwise return null because:
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// * props include a multiline string
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// * text has more than one adjacent line
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// * markup does not close
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const dedentLines = input => {
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const output = [];
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while (output.length < input.length) {
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const line = input[output.length];
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if (hasUnmatchedDoubleQuoteMarks(line)) {
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return null;
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} else if (isFirstLineOfTag(line)) {
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if (!dedentMarkup(input, output)) {
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return null;
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}
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} else {
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output.push(dedentLine(line));
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}
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}
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return output;
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};
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exports.dedentLines = dedentLines;
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