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‎package.json

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{
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"author": "Mike Coolin <[email protected]> (www.coolwebdevelopment.ca)",
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"name": "Node-JavaScript-Preprocessor",
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"description": "A preprocessor for Javascript that supports defines, if else endif and includes.",
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"version": "0.0.1",
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"homepage": "http://coolwebdevelopment.ca/wordpress/index.php/developers-area/javascript/node-javascript-preprocessor/",
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"repository": {
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"type": "git",
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"url": "git://github.com/mcoolin/Node-JavaScript-Preprocessor.git"
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},
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"main": "pp.js",
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"scripts": {
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"test": "node pp.js --help"
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},
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"engines": {
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"node": "~v0.4.11"
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},
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"dependencies": {},
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"devDependencies": {}
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}

‎pp.js

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/*
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pp a javascript preprocessor
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Copyright (c) 2010 Mike Coolin
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Permission is hereby granted, free of charge, to any person
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obtaining a copy of this software and associated documentation
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files (the "Software"), to deal in the Software without
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restriction, including without limitation the rights to use,
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copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following
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conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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OTHER DEALINGS IN THE SOFTWARE.
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*/
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var fs = require('fs'),
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files = [],
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opts = require('tav').set({
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src: {
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note: 'Source file(s) e.g. --src=file1.js,file2.js'
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},
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dst: {
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note: 'Destination to write the file e.g. --dst=o.js'
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},
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def: {
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note: 'Defintion(s) to create e.g. --def=DEBUG,NODE,BROWSER',
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value: ''
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},
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debug : {
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note : 'Enable debugging',
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value : false
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}
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}, "Usage: node pp.js with the following options");
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doPreprocess(opts);
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function doPreprocess(opts){
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if(debug){
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console.log(opts);
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}
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var sa,
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writestream = fs.createWriteStream(opts.dst,
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{ flags: 'w',
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encoding: 'utf8',
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mode: 0666
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}),
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debug = opts.debug,
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defines = [],
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pplines=[],
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comment = '// ',
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commentCode='',
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cnt;
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// handle defines
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sa=opts.def.split(',');
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for(cnt=0;cnt<sa.length;cnt++){
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defines.push(sa[cnt]);
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log('Passed in define '+sa[cnt]);
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}
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sa=opts.src.split(',');
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for(cnt=0;cnt<sa.length;cnt++){
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loadFileandAddLineObject(sa[cnt],pplines);
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}
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ifPass(pplines, defines);
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if(debug){
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dumpLineObjarr(pplines);
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}
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for(cnt=0;cnt<pplines.length;cnt++){
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if(pplines[cnt].addComment){
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commentCode=comment;
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} else {
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commentCode='';
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}
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writestream.write(commentCode + pplines[cnt].text + '\n', 'utf8');
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}
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writestream.end('');
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}
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function parseIf(str){
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return trim(str.replace(/^\s*\/\/@if\b/,''));
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}
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function parseInclude(str){
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return trim(str.replace(/^\s*\/\/@include\b/,''));
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}
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function parseDefine(str){
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return trim(str.replace(/^\s*\/\/@define\b/,''));
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}
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function trim(str){
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return str.replace(/^\s\s*/, '')
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.replace(/\s\s*$/, '');
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}
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function include(arr,obj) {
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return (arr.indexOf(obj) != -1);
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}
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// Add file to process
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// write a header and footer line of file that is being processed
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// append file to file list
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function addFile(fileName) {
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// add logic to detect infinite loops
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if(include(files,fileName)){
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throw new Error('file '+fileName+' has already been included');
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}
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files.push(fileName);
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}
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// produce a string of x characters
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function repeat(str, num) {
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var cnt, rv='';
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for (cnt = 0; cnt < num; cnt++) {
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rv += str;
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}
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return rv;
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}
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// loadFileandAddLineObject
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function loadFileandAddLineObject(fileName,arr){
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var cnt, temparr=[],
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textheader, textfooter,
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headerlen = Math.round((80 - (fileName.length + 5)) / 2),
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footerlen = Math.round((80 - (fileName.length + 9)) / 2);
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temparr = fs.readFileSync(fileName, 'utf8').split('\n');
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// add a header and footer to the array for the file
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textheader = '// ' + repeat("-", headerlen) + ' ' + fileName + ' ' + repeat("-", headerlen);
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// log(textheader);
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textfooter = '// ' + repeat("-", footerlen) + ' end ' + fileName + ' ' + repeat("-", footerlen);
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// log(textfooter)
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temparr.unshift(textheader);
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temparr.push(textfooter);
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for(cnt=0;cnt<temparr.length;cnt++){
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arr.push(new lineObj(temparr[cnt]));
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}
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}
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// dumplineObj
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function dumpLineObjarr(arr){
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var cnt;
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for(cnt=0;cnt<arr.length;cnt++){
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log(cnt+' ac('+arr[cnt].addComment+') vl('+arr[cnt].ifval+')\t'+arr[cnt].text)
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}
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}
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// loop through lines and locate the if/endif blocks
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function ifPass(arr,defines){
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var startEndStack = [],
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iv=false,
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dopop=false,
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pv, pa, pc,
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ifpattern=/^\s*\/\/@if\b/g,
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includepattern=/^\s*\/\/@include\b/g,
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elsepattern=/^\s*\/\/@else/g,
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definepattern = /^\s*\/\/@define\b/g,
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endifpattern = /^\s*\/\/@endif/g;
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for(cnt=0;cnt<arr.length;cnt++){
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if(!arr[cnt].addcomment){
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//define processing
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if (definepattern.test(arr[cnt].text)) {
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// get the parameter(s) and add then to the defines list
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//(assuming a csv list)
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pv = parseDefine(arr[cnt].text);
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log('parsedefine returned (' + pv + ')');
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pa = pv.split(',');
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for (pc = 0; pc < pa.length; pc++) {
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log('adding ' + pa[pc] + ' to defines');
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defines.push(pa[pc]);
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}
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arr[cnt].addComment=true;
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}
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// include processing
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if (includepattern.test(arr[cnt].text)) {
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pv = parseInclude(arr[cnt].text);
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arr[cnt].addComment=true;
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addFile(pv);
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if(arr[cnt].ifval!==false){
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if(startEndStack.length>0 ){
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if(startEndStack[(startEndStack.length-1)].iv){
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loadFileandPrepend(pv, arr, cnt+1);
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}
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}
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}
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}
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//if else endif
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if(ifpattern.test(arr[cnt].text)){
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pv = parseIf(arr[cnt].text);
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pa = pv.split(',');
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iv=false;
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for (pc = 0; pc < pa.length; pc++) {
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if (include(defines, pa[pc])) {
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iv = true;
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}
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}
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arr[cnt].addComment=true;
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arr[cnt].ifval=iv;
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if(startEndStack.length==1){
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//arr[cnt].ifval=iv;
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} else {
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if(startEndStack.length>0){
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iv=arr[cnt].addComment=startEndStack[0].iv;
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}
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}
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startEndStack.push(new ifobj(iv));
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} else {
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if(endifpattern.test(arr[cnt].text)){
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arr[cnt].addComment=true;
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if(startEndStack.length>0){
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dopop=true;
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}
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} else {
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if(elsepattern.test(arr[cnt].text)){
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if(startEndStack.length>0 ){
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log('cnt='+cnt+' elselength='+startEndStack.length);
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if(startEndStack[0].iv){
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startEndStack[(startEndStack.length-1)].iv= (!startEndStack[(startEndStack.length-1)].iv);
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arr[cnt].addcomment=startEndStack[0].iv;
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}
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}
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arr[cnt].addComment=true;
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}
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}
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}
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if(!arr[cnt].addComment){
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// log(cnt);
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if(startEndStack.length>0){
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arr[cnt].ifval=startEndStack[(startEndStack.length-1)].iv;
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if(arr[cnt].ifval==false){
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arr[cnt].addComment=true;
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}
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}
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}
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// do line settings
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if(startEndStack>0){
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// arr[cnt].addComment=startEndStack[startEndStack.length-1].iv;
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}
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// log('cnt='+cnt+' '+startEndStack.length)
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if(dopop){
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startEndStack.pop();
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dopop=false;
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}
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}
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}
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}
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// load a file and prepend it to an array
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function loadFileandPrepend(fileName, arr, at) {
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var cnt,
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textheader, textfooter,
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headerlen = Math.round((80 - (fileName.length + 5)) / 2),
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footerlen = Math.round((80 - (fileName.length + 9)) / 2),
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temparr = [];
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temparr = fs.readFileSync(fileName, 'utf8').split('\n');
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// add a header and footer to the array for the file
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textheader = '// ' + repeat("-", headerlen) + ' ' + fileName + ' ' + repeat("-", headerlen);
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// log(textheader);
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textfooter = '// ' + repeat("-", footerlen) + ' end ' + fileName + ' ' + repeat("-", footerlen);
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// log(textfooter)
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temparr.unshift(textheader);
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temparr.push(textfooter);
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// loop through the array and insert the items to arr
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for (cnt=0; cnt<temparr.length; cnt++) {
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log('adding '+temparr[cnt]+' from '+fileName)
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arr.splice(at+cnt,0, new lineObj(temparr[cnt]));
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}
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}
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function log(str) {
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if (!opts.debug) {
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return;
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}
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console.log(str);
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}
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function lineObj(line){
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this.addComment=false;
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this.ifvars='';
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this.ifval=null;
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this.text=line;
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}
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function dumpobj(obj){
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var n;
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for(n in obj){
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log(n+'='+obj[n]);
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}
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}
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function ifobj(iv){
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this.iv=iv;
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}
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‎tests/ifendif.js

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/*
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* a simple test of the if endif logic
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*
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*/
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//@define Hello
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//@if Hello
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This should show
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//@else
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This should be commented
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//@endif
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//@include nestedfile3.js
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//@if DEBUG
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This should be commented
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//@else
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This should show
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//@endif
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//@if DEBUG
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//@if WIRE
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This should be commented
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//@else
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This should be commented (because its nested out)
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//@endif
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//@else
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This should show
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//@endif
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//@if DEBUG
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This should be commented
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//@endif
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//@if DEBUG
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//@include nofile.js this should not show
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//@endif
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//@if Hello,DEBUG
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This should show
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//@endif

‎tests/nestedfile3.js

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This is the nested file 3
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//@if Hello
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This should show
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//@endif

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