From 7da080b8c32d20b62dfe3893334878d78f5c83e0 Mon Sep 17 00:00:00 2001
From: Sven Slootweg <admin@cryto.net>
Date: Mon, 3 Jul 2017 18:22:23 +0200
Subject: [PATCH] Initial commit

---
 .gitignore    |  2 ++
 .npmignore    |  1 +
 README.md     | 29 ++++++++++++++++++
 gulpfile.js   | 32 ++++++++++++++++++++
 index.js      |  3 ++
 package.json  | 29 ++++++++++++++++++
 src/drv.pegjs | 30 ++++++++++++++++++
 src/index.js  | 84 +++++++++++++++++++++++++++++++++++++++++++++++++++
 test.js       | 12 ++++++++
 9 files changed, 222 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 .npmignore
 create mode 100644 README.md
 create mode 100644 gulpfile.js
 create mode 100644 index.js
 create mode 100644 package.json
 create mode 100644 src/drv.pegjs
 create mode 100644 src/index.js
 create mode 100644 test.js

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..8f028e4
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+/node_modules/
+/lib/
diff --git a/.npmignore b/.npmignore
new file mode 100644
index 0000000..2ccbe46
--- /dev/null
+++ b/.npmignore
@@ -0,0 +1 @@
+/node_modules/
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..7603810
--- /dev/null
+++ b/README.md
@@ -0,0 +1,29 @@
+# drv
+
+A Nix `.drv` file parser.
+
+## License
+
+[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.
+
+## Donate
+
+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)!
+
+You can donate using Bitcoin, PayPal, Flattr, cash-in-mail, SEPA transfers, and pretty much anything else. Thank you!
+
+## Contributing
+
+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/`.
+
+Build tool of choice is `gulp`; simply run `gulp` while developing, and it will watch for changes.
+
+Be aware that by making a pull request, you agree to release your modifications under the licenses stated above.
+
+## Usage
+
+TODO
+
+## API
+
+TODO
diff --git a/gulpfile.js b/gulpfile.js
new file mode 100644
index 0000000..f3143c9
--- /dev/null
+++ b/gulpfile.js
@@ -0,0 +1,32 @@
+const gulp = require('gulp');
+
+const presetES2015 = require("@joepie91/gulp-preset-es2015");
+const presetPegjs = require("@joepie91/gulp-preset-pegjs")
+
+let sources = {
+	babel: ["src/**/*.js"],
+	pegjs: ["src/**/*.pegjs"]
+}
+
+gulp.task('babel', function() {
+	return gulp.src(sources.babel)
+		.pipe(presetES2015({
+			basePath: __dirname
+		}))
+		.pipe(gulp.dest("lib/"));
+});
+
+gulp.task('pegjs', function() {
+	return gulp.src(sources.pegjs)
+		.pipe(presetPegjs({
+			basePath: __dirname
+		}))
+		.pipe(gulp.dest("lib/"));
+})
+
+gulp.task('watch', function () {
+	gulp.watch(sources.babel, ['babel']);
+	gulp.watch(sources.pegjs, ['pegjs']);
+});
+
+gulp.task('default', ['pegjs', 'babel', 'watch']);
diff --git a/index.js b/index.js
new file mode 100644
index 0000000..507257b
--- /dev/null
+++ b/index.js
@@ -0,0 +1,3 @@
+'use strict';
+
+module.exports = require("./lib");
\ No newline at end of file
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..4ce1fde
--- /dev/null
+++ b/package.json
@@ -0,0 +1,29 @@
+{
+  "name": "drv",
+  "version": "1.0.0",
+  "description": "Nix .drv file parser",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "http://git.cryto.net/joepie91/node-drv.git"
+  },
+  "keywords": [
+    "nix",
+    "nixos",
+    "drv",
+    "derive",
+    "derivation",
+    "parser"
+  ],
+  "author": "Sven Slootweg",
+  "license": "WTFPL",
+  "devDependencies": {
+    "@joepie91/gulp-preset-es2015": "^1.0.1",
+    "@joepie91/gulp-preset-pegjs": "^1.0.0",
+    "babel-preset-es2015": "^6.6.0",
+    "gulp": "^3.9.1"
+  }
+}
diff --git a/src/drv.pegjs b/src/drv.pegjs
new file mode 100644
index 0000000..6dc18cd
--- /dev/null
+++ b/src/drv.pegjs
@@ -0,0 +1,30 @@
+start
+	= deriveTag
+
+value
+	= deriveTag
+	/ array
+	/ tuple
+	/ string
+
+multipleItems
+	= item:value subsequentItems:("," value)* { return [item].concat(subsequentItems.map(subsequentItem => subsequentItem[1])); }
+
+deriveTag
+	= "Derive(" items:multipleItems ")" { return {type: "deriveTag", items: items}; }
+
+array
+	= "[" items:multipleItems "]" { return {type: "array", items: items}; }
+
+tuple
+	= "(" items:multipleItems ")" { return {type: "tuple", items: items}; }
+
+string
+	= '"' chars:stringCharacter* '"' { return chars.join(""); }
+
+stringCharacter
+	= !('"' / "\\") char:. { return char; }
+	/ stringEscapedQuote { return '"'; }
+
+stringEscapedQuote
+	= '\\"'
diff --git a/src/index.js b/src/index.js
new file mode 100644
index 0000000..f881e07
--- /dev/null
+++ b/src/index.js
@@ -0,0 +1,84 @@
+'use strict';
+
+const drvParser = require("./drv");
+
+function valueType(value) {
+	if (typeof value === "string") {
+		return "string";
+	} else {
+		return value.type;
+	}
+}
+
+function assertType(value, expectedType) {
+	if (valueType(value) == null) {
+		throw new Error(`Expected a '${expectedType}', got nothing`);
+	} else if (valueType(value) !== expectedType) {
+		throw new Error(`Expected a '${expectedType}', got '${valueType(value)}'`);
+	} else {
+		return true;
+	}
+}
+
+function assertedValue(type, value) {
+	if (assertType(value, type)) {
+		return value;
+	}
+}
+
+function mapArray(array, callback) {
+	return assertedValue("array", array).items.map(callback);
+}
+
+function mapTuple(tuple, fields, callback) {
+	return assertedValue("tuple", tuple).items.reduce((result, item, i) => {
+		if (fields[i] != null) {
+			let value;
+
+			if (callback != null) {
+				value = callback(item, i);
+			} else {
+				value = item;
+			}
+
+			result[fields[i]] = value;
+			return result;
+		} else {
+			throw new Error(`Attempted to map field ${i}, but only ${fields.length} field names were specified`);
+		}
+	}, {});
+}
+
+function parseDerivation(text) {
+	let root = parseAST(text);
+
+	return {
+		outputs: mapArray(root.items[0], (item) => {
+			return mapTuple(item, ["name", "path", "hashAlgorithm", "hash"]);
+		}),
+		inputDerivations: mapArray(root.items[1], (item) => {
+			return mapTuple(item, ["path", "inputDerivations"], (value, i) => {
+				if (i === 1) {
+					/* An `array` of inputDerivations */
+					return value.items;
+				} else {
+					return value;
+				}
+			});
+		}),
+		inputSources: assertedValue("array", root.items[2]).items,
+		platform: assertedValue("string", root.items[3]),
+		builder: assertedValue("string", root.items[4]),
+		builderArguments: assertedValue("array", root.items[5]).items,
+		environmentVariables: mapArray(root.items[6], (item) => {
+			return mapTuple(item, ["name", "value"]);
+		})
+	}
+};
+
+function parseAST(text) {
+	return drvParser.parse(text);
+}
+
+parseDerivation.ast = parseAST;
+module.exports = parseDerivation;
diff --git a/test.js b/test.js
new file mode 100644
index 0000000..00c6934
--- /dev/null
+++ b/test.js
@@ -0,0 +1,12 @@
+'use strict';
+
+const util = require("util");
+const parse = require("./lib");
+
+let testDerivation = 'Derive([("dev","/nix/store/lpwm4gcsda53g26jp6rxz4x13l8lywzg-libXdmcp-1.1.2-dev","",""),("doc","/nix/store/y8925a01zwzrw0sakpv066bc4m6b2qj5-libXdmcp-1.1.2-doc","",""),("out","/nix/store/3iq0cd1ll0c7hss8xxgalxqn0jm0b2mi-libXdmcp-1.1.2","","")],[("/nix/store/3l3gnqvlwrmiqdma5vg3zibkabv4d6wh-pkg-config-0.29.drv",["out"]),("/nix/store/6qrlismj26hncj3809k302z6d3ycfwhh-stdenv.drv",["out"]),("/nix/store/flyb4cyxz0s48iq8qcdxdf2bcmgcc4cq-bash-4.3-p48.drv",["out"]),("/nix/store/pm59fc4bwblygsfxbq5dr72lkg7wxwsi-libXdmcp-1.1.2.tar.bz2.drv",["out"]),("/nix/store/w3qvvackybwaq6d2sw58yacsrbbrxa4b-xproto-7.0.29.drv",["out"])],["/nix/store/zsi9kk33hj7kvjfw0zahpdsiggg58nn4-builder.sh"],"x86_64-linux","/nix/store/gabjbkwga2dhhp2wzyaxl83r8hjjfc37-bash-4.3-p48/bin/bash",["-e","/nix/store/zsi9kk33hj7kvjfw0zahpdsiggg58nn4-builder.sh"],[("buildInputs",""),("builder","/nix/store/gabjbkwga2dhhp2wzyaxl83r8hjjfc37-bash-4.3-p48/bin/bash"),("dev","/nix/store/lpwm4gcsda53g26jp6rxz4x13l8lywzg-libXdmcp-1.1.2-dev"),("doc","/nix/store/y8925a01zwzrw0sakpv066bc4m6b2qj5-libXdmcp-1.1.2-doc"),("hardeningDisable","bindnow relro"),("name","libXdmcp-1.1.2"),("nativeBuildInputs","/nix/store/y419xb805psvlia6rl2jjrxmfsin5v63-pkg-config-0.29 /nix/store/cpy3mign235h3bjx63jz4baiislqznb9-xproto-7.0.29"),("out","/nix/store/3iq0cd1ll0c7hss8xxgalxqn0jm0b2mi-libXdmcp-1.1.2"),("outputs","out dev doc"),("propagatedBuildInputs",""),("propagatedNativeBuildInputs",""),("src","/nix/store/djf171kmvws6891q2nzd2icdjd5bgj4r-libXdmcp-1.1.2.tar.bz2"),("stdenv","/nix/store/985d95clq0216a6pcp3qzw4igp84ajvr-stdenv"),("system","x86_64-linux")])';
+
+try {
+	console.log(util.inspect(parse(testDerivation), {colors: true, depth: null}));
+} catch (err) {
+	console.error(util.inspect(err, {colors: true}));
+}