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/node_modules/
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# better-peg-tracer
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A better terminal-based tracer for debugging PEG.js. Better documentation coming soon.
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![Screenshot of better-peg-tracer on a terminal](https://git.cryto.net/joepie91/better-peg-tracer/raw/master/screenshot.png)
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## License
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[WTFPL](http://www.wtfpl.net/txt/copying/) or [CC0](https://creativecommons.org/publicdomain/zero/1.0/), whichever you prefer. A donation and/or attribution are appreciated, but not required.
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## Donate
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Maintaining open-source projects takes a lot of time, and the more donations I receive, the more time I can dedicate to open-source. If this module is useful to you, consider [making a donation](http://cryto.net/~joepie91/donate.html)!
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You can donate using Bitcoin, PayPal, Flattr, cash-in-mail, SEPA transfers, and pretty much anything else. Thank you!
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## Contributing
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Pull requests welcome. Please make sure your modifications are in line with the overall code style, and ensure that you're editing the files in `src/`, not those in `lib/`.
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Build tool of choice is `gulp`; simply run `gulp` while developing, and it will watch for changes.
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Be aware that by making a pull request, you agree to release your modifications under the licenses stated above.
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## Usage
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```javascript
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const pegjs = require("pegjs");
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const createBetterPegTracer = require("better-peg-tracer");
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let stringToParse = `
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foo{{{}}
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{{align:center}bar
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qux {class:test1,test2}baz{/class}{/align}}
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`.trim();
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let parser = pegjs.buildParser(pegGrammar, {
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trace: true
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});
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let results = parser.parse(stringToParse, {
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tracer: createBetterPegTracer(stringToParse)
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});
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```
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## API
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### createBetterPegTracer(inputString)
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Creates a tracer for the specified `inputString`.
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* __inputString__: The string that is going to be parsed. This is necessary for snippet display to work.
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var gulp = require("gulp");
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var presetES2015 = require("@joepie91/gulp-preset-es2015");
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var source = ["src/**/*.js"]
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gulp.task('babel', function() {
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return gulp.src(source)
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.pipe(presetES2015({
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basePath: __dirname
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}))
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.pipe(gulp.dest("lib/"));
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});
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gulp.task("watch", function () {
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gulp.watch(source, ["babel"]);
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});
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gulp.task("default", ["babel", "watch"]);
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'use strict';
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module.exports = require("./lib");
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{
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"name": "better-peg-tracer",
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"version": "1.0.0",
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"description": "A better tracer for PEG.js",
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"main": "index.js",
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"scripts": {
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"test": "echo \"Error: no test specified\" && exit 1",
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"gulp": "gulp"
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},
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"repository": {
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"type": "git",
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"url": "http://git.cryto.net/joepie91/better-peg-tracer.git"
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},
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"keywords": [
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"PEG",
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"PEG.js",
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"tracer",
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"parser",
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"debugger"
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],
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"author": "Sven Slootweg",
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"license": "WTFPL",
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"dependencies": {
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"chalk": "^1.1.3",
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"default-value": "^1.0.0",
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"pad": "^1.1.0"
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},
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"devDependencies": {
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"@joepie91/gulp-preset-es2015": "^1.0.1",
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"babel-preset-es2015": "^6.6.0",
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"gulp": "^3.9.1"
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}
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}
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'use strict';
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const pad = require("pad");
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const chalk = Object.assign(require("chalk"), {enabled: true});
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const defaultValue = require("default-value");
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module.exports = function createBetterPegTracer(parsedString) {
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let currentLevel = 0;
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let lastWasFail = false
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let parsedStringLines = parsedString.split("\n");
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let lastSeenRule = [];
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return {
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trace: function trace(event) {
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if (event.type === "rule.fail" || event.type === "rule.match") {
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currentLevel -= 1;
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}
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let ruleIndent = pad("", currentLevel * 4);
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let eventName = event.type.replace(/^rule\./, "");
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let isMultiline = (parsedStringLines.length > 1);
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let startLine = event.location.start.line;
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let endLine = event.location.end.line;
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let startColumn = event.location.start.column;
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let endColumn = event.location.end.column;
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let firstLine = parsedStringLines[startLine - 1];
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let lastLine = parsedStringLines[endLine - 1];
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let affectedString, color, startPosition, endPosition, position;
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if (isMultiline) {
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startPosition = `${pad(4, startLine)}:${pad(2, startColumn)}`;
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if (startLine !== endLine || startColumn !== endColumn) {
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endPosition = `${pad(4, endLine)}:${pad(2, endColumn)}`;
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}
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} else {
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startPosition = startColumn;
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if (startColumn !== endColumn) {
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endPosition = endColumn;
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}
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}
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position = `${pad(8, startPosition)} ${chalk.white("│")} ${pad(8, defaultValue(endPosition, ""))}`;
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if (startLine === endLine) {
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if (startColumn === endColumn) {
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/* Not reading a range, but rather attempting to find a match from the current point. */
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if (event.location.start.offset < parsedString.length) {
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affectedString = chalk.gray(`${firstLine.slice(startColumn - 1)} ...`);
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} else {
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affectedString = "";
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}
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} else {
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affectedString = firstLine.slice(startColumn - 1, endColumn - 1);
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}
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} else {
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affectedString = `${firstLine.slice(startColumn - 1)} ... ${lastLine.slice(0, endColumn - 1)}`;
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}
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if (event.type === "rule.enter") {
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lastSeenRule[currentLevel] = event.rule;
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}
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if (event.type === "rule.match") {
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color = chalk.green;
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} else if (event.type === "rule.fail") {
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color = chalk.red;
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} else {
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color = chalk.white;
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}
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let crumbs = lastSeenRule.slice(0, currentLevel).concat([color(event.rule)]);
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let limitedCrumbs;
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if (crumbs.length > 6) {
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limitedCrumbs = crumbs.slice(0, 2).concat([`... ${crumbs.length - 5} hidden ...`]).concat(crumbs.slice(-3));
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} else {
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limitedCrumbs = crumbs;
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}
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let line = [
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position,
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pad(eventName, 5),
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chalk.gray(pad(limitedCrumbs.join(" -> "), "90")),
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affectedString
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].join(` ${chalk.white("│")} `);
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process.stdout.write(color(line + "\n"));
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if (event.type === "rule.enter") {
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currentLevel += 1;
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}
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}
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}
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}
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