/*
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* preprocess
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* https://github.com/onehealth/preprocess
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*
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* Copyright (c) 2012 OneHealth Solutions, Inc.
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* Written by Jarrod Overson - http://jarrodoverson.com/
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* Licensed under the Apache 2.0 license.
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*/
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'use strict';
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exports.preprocess = preprocess;
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exports.preprocessFile = preprocessFile;
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exports.preprocessFileSync = preprocessFileSync;
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var path = require('path'),
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fs = require('fs'),
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os = require('os'),
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delim = require('./regexrules'),
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XRegExp = require('xregexp');
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function preprocessFile(srcFile, destFile, context, callback, options) {
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options = getOptionsForFile(srcFile, options);
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context.src = srcFile;
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fs.readFile(srcFile, function (err, data) {
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if (err) return callback(err, data);
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var parsed = preprocess(data, context, options);
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fs.writeFile(destFile, parsed, callback);
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});
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}
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function preprocessFileSync(srcFile, destFile, context, options) {
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options = getOptionsForFile(srcFile, options);
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context.src = srcFile;
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var data = fs.readFileSync(srcFile);
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var parsed = preprocess(data, context, options);
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return fs.writeFileSync(destFile, parsed);
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}
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function getOptionsForFile(srcFile, options) {
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options = options || {};
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options.srcDir = options.srcDir || path.dirname(srcFile);
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options.type = options.type || getExtension(srcFile);
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return options;
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}
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function getExtension(filename) {
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var ext = path.extname(filename||'').split('.');
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return ext[ext.length - 1];
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}
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function preprocess(src, context, typeOrOptions) {
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src = src.toString();
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context = context || process.env;
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// default values
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var options = {
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fileNotFoundSilentFail: false,
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srcDir: process.cwd(),
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srcEol: getEolType(src),
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type: delim['html']
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};
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// needed for backward compatibility with 2.x.x series
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if (typeof typeOrOptions === 'string') {
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typeOrOptions = {
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type: typeOrOptions
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};
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}
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// needed for backward compatibility with 2.x.x series
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if (typeof context.srcDir === "string") {
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typeOrOptions = typeOrOptions || {};
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typeOrOptions.srcDir = context.srcDir;
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}
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if (typeOrOptions && typeof typeOrOptions === 'object') {
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options.srcDir = typeOrOptions.srcDir || options.srcDir;
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options.fileNotFoundSilentFail = typeOrOptions.fileNotFoundSilentFail || options.fileNotFoundSilentFail;
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options.srcEol = typeOrOptions.srcEol || options.srcEol;
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options.type = delim[typeOrOptions.type] || options.type;
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}
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context = copy(context);
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return preprocessor(src, context, options);
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}
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function preprocessor(src, context, opts, noRestoreEol) {
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src = normalizeEol(src);
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var rv = src;
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// 不支持该语法，无需执行，大字符串时，该正则性能极低（比如包含较大base64时）（https://github.com/dcloudio/uni-app/issues/4661）
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// rv = replace(rv, opts.type.include, processIncludeDirective.bind(null, false, context, opts));
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// if (opts.type.extend) {
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// rv = replaceRecursive(rv, opts.type.extend, function(startMatches, endMatches, include, recurse) {
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// var file = (startMatches[1] || '').trim();
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// var extendedContext = copy(context);
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// var extendedOpts = copy(opts);
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// extendedContext.src = path.join(opts.srcDir, file);
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// extendedOpts.srcDir = path.dirname(extendedContext.src);
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// var fileContents = getFileContents(extendedContext.src, opts.fileNotFoundSilentFail, context.src);
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// if (fileContents.error) {
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// return fileContents.contents;
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// }
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// var extendedSource = preprocessor(fileContents.contents, extendedContext, extendedOpts, true).trim();
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// if (extendedSource) {
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// include = include.replace(/^\n?|\n?$/g, '');
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// return replace(extendedSource, opts.type.extendable, recurse(include));
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// } else {
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// return '';
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// }
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// });
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// }
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// if (opts.type.foreach) {
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// rv = replaceRecursive(rv, opts.type.foreach, function(startMatches, endMatches, include, recurse) {
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// var variable = (startMatches[1] || '').trim();
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// var forParams = variable.split(' ');
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// if (forParams.length === 3) {
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// var contextVar = forParams[2];
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// var arrString = getDeepPropFromObj(context, contextVar);
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// var eachArr;
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// if (arrString.match(/\{(.*)\}/)) {
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// eachArr = JSON.parse(arrString);
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// } else if (arrString.match(/\[(.*)\]/)) {
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// eachArr = arrString.slice(1, -1);
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// eachArr = eachArr.split(',');
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// eachArr = eachArr.map(function(arrEntry){
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// return arrEntry.replace(/\s*(['"])(.*)\1\s*/, '$2');
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// });
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// } else {
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// eachArr = arrString.split(',');
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// }
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// var replaceToken = new RegExp(XRegExp.escape(forParams[0]), 'g');
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// var recursedInclude = recurse(include);
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// return Object.keys(eachArr).reduce(function(stringBuilder, arrKey){
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// var arrEntry = eachArr[arrKey];
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// return stringBuilder + recursedInclude.replace(replaceToken, arrEntry);
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// }, '');
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// } else {
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// return '';
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// }
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// });
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// }
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// if (opts.type.exclude) {
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// rv = replaceRecursive(rv, opts.type.exclude, function(startMatches, endMatches, include, recurse){
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// var test = (startMatches[1] || '').trim();
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// return testPasses(test,context) ? '' : recurse(include);
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// });
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// }
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if (opts.type.if) {
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rv = replaceRecursive(rv, opts.type.if, function (startMatches, endMatches, include, recurse) {
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// I need to recurse first, so I don't catch "inner" else-directives
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var recursed = recurse(include);
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// look for the first else-directive
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var matches = opts.type.else && recursed.match(new RegExp(opts.type.else));
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var match = (matches || [""])[0];
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var index = match ? recursed.indexOf(match) : recursed.length;
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var ifBlock = recursed.substring(0, index);
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var elseBlock = recursed.substring(index + match.length); // empty string if no else-directive
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var variant = startMatches[1];
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var test = (startMatches[2] || '').trim();
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// fixed by xxxxxx
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var startLine = padContent(startMatches.input)
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var endLine = padContent(endMatches.input)
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switch(variant) {
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case 'if':
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case 'ifdef': // fixed by xxxxxx
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return testPasses(test, context) ? (startLine + ifBlock + endLine) : (startLine + padContent(ifBlock) + padContent(match || '') + elseBlock + endLine);
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case 'ifndef':
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return !testPasses(test, context) ? (startLine + ifBlock + endLine) : (startLine + padContent(ifBlock) + padContent(match || '') + elseBlock + endLine);
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// case 'ifdef':
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// return typeof getDeepPropFromObj(context, test) !== 'undefined' ? ifBlock : elseBlock;
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// case 'ifndef':
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// return typeof getDeepPropFromObj(context, test) === 'undefined' ? ifBlock : elseBlock;
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default:
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throw new Error('Unknown if variant ' + variant + '.');
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}
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});
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}
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// rv = replace(rv, opts.type.echo, function (match, variable) {
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// variable = (variable || '').trim();
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// // if we are surrounded by quotes, echo as a string
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// var stringMatch = variable.match(/^(['"])(.*)\1$/);
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// if (stringMatch) return stringMatch[2];
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// var arrString = getDeepPropFromObj(context, variable);
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// return typeof arrString !== 'undefined' ? arrString : '';
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// });
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// rv = replace(rv, opts.type.exec, function (match, name, value) {
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// name = (name || '').trim();
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// value = value || '';
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// var params = value.split(',');
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// var stringRegex = /^['"](.*)['"]$/;
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// params = params.map(function(param){
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// param = param.trim();
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// if (stringRegex.test(param)) { // handle string parameter
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// return param.replace(stringRegex, '$1');
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// } else { // handle variable parameter
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// return getDeepPropFromObj(context, param);
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// }
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// });
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// var fn = getDeepPropFromObj(context, name);
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// if (!fn || typeof fn !== 'function') return '';
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// return fn.apply(context, params);
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// });
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// rv = replace(rv, opts.type['include-static'], processIncludeDirective.bind(null, true, context, opts));
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if (!noRestoreEol) {
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rv = restoreEol(rv, opts.srcEol);
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}
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return rv;
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}
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function getEolType(source) {
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var eol;
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var foundEolTypeCnt = 0;
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if (source.indexOf('\r\n') >= 0) {
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eol = '\r\n';
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foundEolTypeCnt++;
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}
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if (/\r[^\n]/.test(source)) {
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eol = '\r';
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foundEolTypeCnt++;
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}
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if (/[^\r]\n/.test(source)) {
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eol = '\n';
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foundEolTypeCnt++;
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}
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if (eol == null || foundEolTypeCnt > 1) {
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eol = os.EOL;
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}
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return eol;
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}
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function normalizeEol(source, indent) {
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// only process any kind of EOL if indentation has to be added, otherwise replace only non \n EOLs
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if (indent) {
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source = source.replace(/(?:\r?\n)|\r/g, '\n' + indent);
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} else {
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source = source.replace(/(?:\r\n)|\r/g, '\n');
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}
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return source;
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}
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function restoreEol(normalizedSource, originalEol) {
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if (originalEol !== '\n') {
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normalizedSource = normalizedSource.replace(/\n/g, originalEol);
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}
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return normalizedSource;
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}
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function replace(rv, rule, processor) {
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var isRegex = typeof rule === 'string' || rule instanceof RegExp;
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var isArray = Array.isArray(rule);
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if (isRegex) {
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rule = [new RegExp(rule,'gmi')];
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} else if (isArray) {
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rule = rule.map(function(subRule){
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return new RegExp(subRule,'gmi');
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});
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} else {
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throw new Error('Rule must be a String, a RegExp, or an Array.');
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}
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return rule.reduce(function(rv, rule){
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return rv.replace(rule, processor);
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}, rv);
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}
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function replaceRecursive(rv, rule, processor) {
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if(!rule.start || !rule.end) {
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throw new Error('Recursive rule must have start and end.');
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}
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var startRegex = new RegExp(rule.start, 'mi');
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var endRegex = new RegExp(rule.end, 'mi');
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function matchReplacePass(content) {
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var matches = XRegExp.matchRecursive(content, rule.start, rule.end, 'gmi', {
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valueNames: ['between', 'left', 'match', 'right']
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});
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var matchGroup = {
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left: null,
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match: null,
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right: null
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};
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return matches.reduce(function (builder, match) {
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switch(match.name) {
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case 'between':
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builder += match.value;
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break;
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case 'left':
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matchGroup.left = startRegex.exec(match.value);
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break;
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case 'match':
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matchGroup.match = match.value;
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break;
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case 'right':
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matchGroup.right = endRegex.exec(match.value);
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builder += processor(matchGroup.left, matchGroup.right, matchGroup.match, matchReplacePass);
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break;
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}
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return builder;
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}, '');
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}
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return matchReplacePass(rv);
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}
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function processIncludeDirective(isStatic, context, opts, match, linePrefix, file) {
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file = (file || '').trim();
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var indent = linePrefix.replace(/\S/g, ' ');
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var includedContext = copy(context);
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var includedOpts = copy(opts);
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includedContext.src = path.join(opts.srcDir,file);
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includedOpts.srcDir = path.dirname(includedContext.src);
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var fileContents = getFileContents(includedContext.src, opts.fileNotFoundSilentFail, context.src);
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if (fileContents.error) {
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return linePrefix + fileContents.contents;
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}
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var includedSource = fileContents.contents;
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if (isStatic) {
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includedSource = fileContents.contents;
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} else {
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includedSource = preprocessor(fileContents.contents, includedContext, includedOpts, true);
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}
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includedSource = normalizeEol(includedSource, indent);
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if (includedSource) {
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return linePrefix + includedSource;
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} else {
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return linePrefix;
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}
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}
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function getTestTemplate(test) {
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/*jshint evil:true*/
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test = test || 'true';
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test = test.trim();
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// force single equals replacement
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// fixed by xxxxxx 不替换，会影响 >= 等判断
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// test = test.replace(/([^=!])=([^=])/g, '$1==$2');
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// fixed by xxxxxx
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test = test.replace(/-/g, '_')
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return new Function("context", "with (context||{}){ return ( " + test + " ); }");
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}
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// fixed by xxxxxx
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function testPasses(test, context) {
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var testFn = getTestTemplate(test)
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try {
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return testFn(context, getDeepPropFromObj)
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} catch (e) {}
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return false
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}
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function getFileContents(path, failSilent, requesterPath) {
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try {
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fs.statSync(path);
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} catch (e) {
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if (failSilent) {
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return {error: true, contents: path + ' not found!'};
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} else {
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var errMsg = path;
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errMsg = requesterPath ? errMsg + ' requested from ' + requesterPath : errMsg;
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errMsg += ' not found!';
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throw new Error(errMsg);
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}
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}
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return {error: false, contents: fs.readFileSync(path).toString()};
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}
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function copy(obj) {
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return Object.keys(obj).reduce(function (copyObj, objKey) {
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copyObj[objKey] = obj[objKey];
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return copyObj;
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}, {});
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}
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function getDeepPropFromObj(obj, propPath) {
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propPath.replace(/\[([^\]+?])\]/g, '.$1');
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propPath = propPath.split('.');
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// fast path, no need to loop if structurePath contains only a single segment
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if (propPath.length === 1) {
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return obj[propPath[0]];
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}
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// loop only as long as possible (no exceptions for null/undefined property access)
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propPath.some(function (pathSegment) {
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obj = obj[pathSegment];
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return (obj == null);
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});
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return obj;
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}
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// fixed by xxxxxx
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const splitRE = /\r?\n/g
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function padContent(content) {
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return Array(content.split(splitRE).length).join('\n')
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}
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