mirror of https://github.com/nodejs/node.git
59 lines
1.7 KiB
JavaScript
59 lines
1.7 KiB
JavaScript
'use strict';
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module.exports = preprocess;
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const path = require('path');
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const fs = require('fs');
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const includeExpr = /^@include\s+([A-Za-z0-9-_]+)(?:\.)?([a-zA-Z]*)$/gmi;
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const includeData = {};
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function preprocess(inputFile, input, cb) {
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input = stripComments(input);
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processIncludes(inputFile, input, cb);
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}
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function stripComments(input) {
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return input.replace(/^@\/\/.*$/gmi, '');
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}
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function processIncludes(inputFile, input, cb) {
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const includes = input.match(includeExpr);
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if (includes === null) return cb(null, input);
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var errState = null;
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var incCount = includes.length;
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if (incCount === 0) cb(null, input);
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includes.forEach(function(include) {
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var fname = include.replace(/^@include\s+/, '');
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if (!fname.match(/\.md$/)) fname = `${fname}.md`;
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if (includeData.hasOwnProperty(fname)) {
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input = input.split(include).join(includeData[fname]);
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incCount--;
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if (incCount === 0) {
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return cb(null, input);
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}
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}
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const fullFname = path.resolve(path.dirname(inputFile), fname);
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fs.readFile(fullFname, 'utf8', function(er, inc) {
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if (errState) return;
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if (er) return cb(errState = er);
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preprocess(inputFile, inc, function(er, inc) {
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if (errState) return;
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if (er) return cb(errState = er);
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incCount--;
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// Add comments to let the HTML generator know how the anchors for
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// headings should look like.
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includeData[fname] = `<!-- [start-include:${fname}] -->\n` +
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`${inc}\n<!-- [end-include:${fname}] -->\n`;
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input = input.split(`${include}\n`).join(`${includeData[fname]}\n`);
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if (incCount === 0) {
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return cb(null, input);
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}
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});
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});
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});
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}
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