commit 1107483c86bf467e2872a1860756d6f7429498ae Author: Tony Garnock-Jones Date: Sat Jan 30 21:58:59 2016 -0500 Initial commit. diff --git a/js/.gitignore b/js/.gitignore new file mode 100644 index 0000000..911168a --- /dev/null +++ b/js/.gitignore @@ -0,0 +1,2 @@ +scratch/ +node_modules/ diff --git a/js/Makefile b/js/Makefile new file mode 100644 index 0000000..aae362f --- /dev/null +++ b/js/Makefile @@ -0,0 +1,23 @@ +all: + npm install . + +keys: private-key.pem server-cert.pem + +private-key.pem: + openssl genrsa -des3 -passout pass:a -out $@ 1024 + openssl rsa -passin pass:a -in $@ -out $@ + +server-cert.pem: private-key.pem + openssl req -new -x509 -nodes -sha1 -days 365 \ + -subj /CN=server.minimart.leastfixedpoint.com \ + -passin pass:a \ + -key private-key.pem > $@ + +clean-keys: + rm -f private-key.pem server-cert.pem + +clean: + rm -f dist/*.js + +veryclean: clean + rm -rf node_modules/ diff --git a/js/README.md b/js/README.md new file mode 100644 index 0000000..c378d9b --- /dev/null +++ b/js/README.md @@ -0,0 +1,11 @@ +# Syndicate-JS: Syndicate for Javascript environments + +## A walk through the code + +Source files in `src/`, from most general to most specific: + + - `reflect.js`: Reflection on function formal parameter lists. + - `util.js`: Functions `extend` and `kwApply`. + - `route.js`: Implementation of dataspace trie structure. + - `syndicate.js`: Implementation of core leaf actors and networks. + - `main.js`: Main package entry point. diff --git a/js/dist/README.md b/js/dist/README.md new file mode 100644 index 0000000..b1239b6 --- /dev/null +++ b/js/dist/README.md @@ -0,0 +1 @@ +Directory for build products, checked in to the repo for ease-of-use. diff --git a/js/package.json b/js/package.json new file mode 100644 index 0000000..6f95dc9 --- /dev/null +++ b/js/package.json @@ -0,0 +1,29 @@ +{ + "name": "syndicate-js", + "version": "0.0.0", + "description": "Syndicate in the browser", + "homepage": "https://github.com/tonyg/syndicate", + "main": "src/main.js", + "repository": { + "type": "git", + "url": "git://github.com/tonyg/syndicate" + }, + "scripts": { + "clean": "rm -f dist/*", + "build-debug": "browserify src/main.js -d -s Syndicate -o dist/syndicate.js", + "build-min": "browserify src/main.js -s Syndicate -o dist/_syndicate.js && uglifyjs dist/_syndicate.js -o dist/syndicate.min.js && rm dist/_syndicate.js", + "build": "npm run build-debug && npm run build-min", + "watch": "watchify src/main.js -d -s Syndicate -o dist/syndicate.js", + "test": "mocha", + "prepublish": "npm run build" + }, + "author": "Tony Garnock-Jones ", + "devDependencies": { + "watchify": "^3.7.0", + "uglify-js": "^2.6.1", + "browserify": "^13.0.0", + "mocha": "^2.4.5", + "expect.js": "^0.3.1", + "immutable": "^3.7.6" + } +} diff --git a/js/src/main.js b/js/src/main.js new file mode 100644 index 0000000..4be4026 --- /dev/null +++ b/js/src/main.js @@ -0,0 +1,16 @@ +module.exports = require("./syndicate.js"); + +// module.exports.DOM = require("./dom-driver.js"); +// module.exports.JQuery = require("./jquery-driver.js"); +// module.exports.RoutingTableWidget = require("./routing-table-widget.js"); +// module.exports.WebSocket = require("./websocket-driver.js"); +module.exports.Reflect = require("./reflect.js"); + +// module.exports.Ground = require("./ground.js").Ground; +// module.exports.Actor = require("./actor.js").Actor; +// module.exports.Spy = require("./spy.js").Spy; +// module.exports.WakeDetector = require("./wake-detector.js").WakeDetector; + +// var Worker = require("./worker.js"); +// module.exports.Worker = Worker.Worker; +// module.exports.WorkerGround = Worker.WorkerGround; diff --git a/js/src/reflect.js b/js/src/reflect.js new file mode 100644 index 0000000..8afafef --- /dev/null +++ b/js/src/reflect.js @@ -0,0 +1,26 @@ +// Reflection on function formal parameter lists. +// This module is based on Angular's "injector" code, +// https://github.com/angular/angular.js/blob/master/src/auto/injector.js, +// MIT licensed, and hence: +// Copyright (c) 2010-2014 Google, Inc. http://angularjs.org +// Copyright (c) 2014 Tony Garnock-Jones + +var FN_ARGS = /^function\s*[^\(]*\(\s*([^\)]*)\)/m; +var FN_ARG_SPLIT = /,/; +var STRIP_COMMENTS = /((\/\/.*$)|(\/\*[\s\S]*?\*\/))/mg; + +function formalParameters(fn) { + var result = []; + + var fnText = fn.toString().replace(STRIP_COMMENTS, ''); + var argDecl = fnText.match(FN_ARGS); + var args = argDecl[1].split(FN_ARG_SPLIT); + for (var i = 0; i < args.length; i++) { + var trimmed = args[i].trim(); + if (trimmed) { result.push(trimmed); } + } + + return result; +} + +module.exports.formalParameters = formalParameters; diff --git a/js/src/route.js b/js/src/route.js new file mode 100644 index 0000000..86828c8 --- /dev/null +++ b/js/src/route.js @@ -0,0 +1,1004 @@ +var Immutable = require("immutable"); + +var __ = "__"; /* wildcard marker */ + +var SOA = "__["; // start of array +var EOA = "__]"; // end of array + +function die(message) { + throw new Error(message); +} + +function $Embedded(trie) { + this.trie = trie; +} + +function embeddedTrie(trie) { + return new $Embedded(trie); +} + +// The name argument should be a string or null; it defaults to null. +// The pattern argument defaults to wildcard, __. +function $Capture(name, pattern) { + this.name = name || null; + this.pattern = (typeof pattern === 'undefined' ? __ : pattern); +} + +// Abbreviation: _$(...) <==> new $Capture(...) +function _$(name, pattern) { + return new $Capture(name, pattern); +} + +function isCapture(x) { return x instanceof $Capture || x === _$; } +function captureName(x) { return x instanceof $Capture ? x.name : null; } +function capturePattern(x) { return x instanceof $Capture ? x.pattern : __; } + +var SOC = "__{{"; // start of capture +var EOC = "__}}"; // end of capture + +function $Success(value) { + this.value = value; +} + +$Success.prototype.equals = function (other) { + if (!(other instanceof $Success)) return false; + return Immutable.is(this.value, other.value); +} + +function $WildcardSequence(trie) { + this.trie = trie; +} + +$WildcardSequence.prototype.equals = function (other) { + if (!(other instanceof $WildcardSequence)) return false; + return Immutable.is(this.trie, other.trie); +} + +function is_emptyTrie(m) { + return Object.is(m, emptyTrie); +} + +/////////////////////////////////////////////////////////////////////////// +// Constructors + +var emptyTrie = Immutable.Map(); + +function rsuccess(v) { + return (v === null) ? emptyTrie : new $Success(v); +} + +function rseq(e, r) { + if (r === emptyTrie) return emptyTrie; + return emptyTrie.set(e, r); +} + +function rwild(r) { + return rseq(__, r); +} + +function rwildseq(r) { + return (r === emptyTrie) ? emptyTrie : new $WildcardSequence(r); +} + +/////////////////////////////////////////////////////////////////////////// + +function compilePattern(v, p) { + if (!p) die("compilePattern: missing pattern"); + return walk(p, rseq(EOA, rsuccess(v))); + + function walk(p, acc) { + if (p === __) return rwild(acc); + + if (Array.isArray(p)) { + acc = rseq(EOA, acc); + for (var i = p.length - 1; i >= 0; i--) { + acc = walk(p[i], acc); + } + return rseq(SOA, acc); + } + + if (p instanceof $Embedded) { + return appendTrie(p.trie, function (v) { return acc; }); + } else { + return rseq(p, acc); + } + } +} + +function matchPattern(v, p) { + var captureCount = 0; + var result = {}; + try { + walk(v, p); + } catch (e) { + if (e.matchPatternFailed) return null; + throw e; + } + result.length = captureCount; + return result; + + function walk(v, p) { + if (p === v) return; + + if (p === __) return; + + if (Array.isArray(p) && Array.isArray(v) && p.length === v.length) { + for (var i = 0; i < p.length; i++) { + walk(v[i], p[i]); + } + return; + } + + if (isCapture(p)) { + var thisCapture = captureCount++; + walk(v, capturePattern(p)); + result[captureName(p) || ('$' + thisCapture)] = v; + return; + } + + if (p instanceof $Embedded) { + die("$Embedded patterns not supported in matchPattern()"); + } + + throw {matchPatternFailed: true}; + } +} + +function rupdate(r, key, k) { + if (is_emptyTrie(k)) { + return r.remove(key); + } else { + return r.set(key, k); + } +} + +function rlookup(r, key) { + return r.get(key, emptyTrie); +} + +function is_keyOpen(k) { + return k === SOA; +} + +function is_keyClose(k) { + return k === EOA; +} + +function is_keyNormal(k) { + return !(is_keyOpen(k) || is_keyClose(k)); +} + +/////////////////////////////////////////////////////////////////////////// + +var unionSuccesses = function (v1, v2) { + if (v1 === true) return v2; + if (v2 === true) return v1; + return v1.union(v2); +}; + +var intersectSuccesses = function (v1, v2) { + return v1; +}; + +var subtractSuccesses = function (v1, v2) { + var r = v1.subtract(v2); + if (r.isEmpty()) return null; + return r; +}; + +var matchTrieSuccesses = function (v1, v2, acc) { + return acc.union(v2); +}; + +var projectSuccess = function (v) { + return v; +}; + +/////////////////////////////////////////////////////////////////////////// + +function expandWildseq(r) { + return union(rwild(rwildseq(r)), rseq(EOA, r)); +} + +function union(o1, o2) { + return merge(o1, o2); + + function merge(o1, o2) { + if (is_emptyTrie(o1)) return o2; + if (is_emptyTrie(o2)) return o1; + return walk(o1, o2); + } + + function walk(r1, r2) { + if (r1 instanceof $WildcardSequence) { + if (r2 instanceof $WildcardSequence) { + return rwildseq(walk(r1.trie, r2.trie)); + } + r1 = expandWildseq(r1.trie); + } else if (r2 instanceof $WildcardSequence) { + r2 = expandWildseq(r2.trie); + } + + if (r1 instanceof $Success && r2 instanceof $Success) { + return rsuccess(unionSuccesses(r1.value, r2.value)); + } + + var w = merge(rlookup(r1, __), rlookup(r2, __)); + if (is_emptyTrie(w)) { + var smaller = r1.size < r2.size ? r1 : r2; + var larger = r1.size < r2.size ? r2 : r1; + var target = larger; + smaller.forEach(function (val, key) { + var k = merge(rlookup(smaller, key), rlookup(larger, key)); + target = rupdate(target, key, k); + }); + return target; + } else { + var target = rwild(w); + function examineKey(rA, key, rB) { + if ((key !== __) && !target.has(key)) { + var k = merge(rlookup(rA, key), rlookup(rB, key)); + if (is_keyOpen(key)) { + target = rupdate(target, key, merge(rwildseq(w), k)); + } else if (is_keyClose(key)) { + if (w instanceof $WildcardSequence) { + target = rupdate(target, key, merge(w.trie, k)); + } else { + target = rupdate(target, key, k); + } + } else { + target = rupdate(target, key, merge(w, k)); + } + } + } + r1.forEach(function (val, key) { examineKey(r1, key, r2) }); + r2.forEach(function (val, key) { examineKey(r2, key, r1) }); + return target; + } + } +} + +function unionN() { + var acc = emptyTrie; + for (var i = 0; i < arguments.length; i++) { + acc = union(acc, arguments[i]); + } + return acc; +} + +function intersect(o1, o2) { + return walk(o1, o2); + + function walkFlipped(r2, r1) { return walk(r1, r2); } + + function walk(r1, r2) { + // INVARIANT: r1 is a part of the original o1, and + // likewise for r2. This is so that the first arg to + // intersectSuccesses always comes from r1, and the second + // from r2. + if (is_emptyTrie(r1)) return emptyTrie; + if (is_emptyTrie(r2)) return emptyTrie; + + if (r1 instanceof $WildcardSequence) { + if (r2 instanceof $WildcardSequence) { + return rwildseq(walk(r1.trie, r2.trie)); + } + r1 = expandWildseq(r1.trie); + } else if (r2 instanceof $WildcardSequence) { + r2 = expandWildseq(r2.trie); + } + + if (r1 instanceof $Success && r2 instanceof $Success) { + return rsuccess(intersectSuccesses(r1.value, r2.value)); + } + + var w1 = rlookup(r1, __); + var w2 = rlookup(r2, __); + var w = walk(w1, w2); + + var target = emptyTrie; + + function examineKey(key) { + if ((key !== __) && !target.has(key)) { + var k1 = rlookup(r1, key); + var k2 = rlookup(r2, key); + if (is_emptyTrie(k1)) { + if (is_emptyTrie(k2)) { + target = rupdate(target, key, emptyTrie); + } else { + target = rupdate(target, key, walkWild(walk, w1, key, k2)); + } + } else { + if (is_emptyTrie(k2)) { + target = rupdate(target, key, walkWild(walkFlipped, w2, key, k1)); + } else { + target = rupdate(target, key, walk(k1, k2)); + } + } + } + } + + if (is_emptyTrie(w1)) { + if (is_emptyTrie(w2)) { + (r1.size < r2.size ? r1 : r2).forEach(function (val, key) { examineKey(key) }); + } else { + r1.forEach(function (val, key) { examineKey(key) }); + } + } else { + if (is_emptyTrie(w2)) { + r2.forEach(function (val, key) { examineKey(key) }); + } else { + target = rupdateInplace(target, __, w); + r1.forEach(function (val, key) { examineKey(key) }); + r2.forEach(function (val, key) { examineKey(key) }); + } + } + return target; + } + + function walkWild(walker, w, key, k) { + if (is_emptyTrie(w)) return emptyTrie; + if (is_keyOpen(key)) return walker(rwildseq(w), k); + if (is_keyClose(key)) { + if (w instanceof $WildcardSequence) return walker(w.trie, k); + return emptyTrie; + } + return walker(w, k); + } +} + +// Removes r2's mappings from r1. Assumes r2 has previously been +// union'd into r1. The subtractSuccesses function should return +// null to signal "no remaining success values". +function subtract(o1, o2) { + return walk(o1, o2); + + function walk(r1, r2) { + if (is_emptyTrie(r1)) { + return emptyTrie; + } else { + if (is_emptyTrie(r2)) { + return r1; + } + } + + if (r1 instanceof $WildcardSequence) { + if (r2 instanceof $WildcardSequence) { + return rwildseq(walk(r1.trie, r2.trie)); + } + r1 = expandWildseq(r1.trie); + } else if (r2 instanceof $WildcardSequence) { + r2 = expandWildseq(r2.trie); + } + + if (r1 instanceof $Success && r2 instanceof $Success) { + return rsuccess(subtractSuccesses(r1.value, r2.value)); + } + + var w1 = rlookup(r1, __); + var w2 = rlookup(r2, __); + var w = walk(w1, w2); + var target; + + function examineKey(key) { + if (key !== __) { + var k1 = rlookup(r1, key); + var k2 = rlookup(r2, key); + var updatedK; + if (is_emptyTrie(k2)) { + updatedK = walkWild(key, k1, w2); + } else { + updatedK = walk(k1, k2); + } + // Here we ensure a "minimal" remainder in cases + // where after an erasure, a particular key's + // continuation is the same as the wildcard's + // continuation. TODO: the equals check may + // be expensive. If so, how can it be made + // cheaper? + if (is_keyOpen(key)) { + target = rupdate(target, key, + ((updatedK instanceof $WildcardSequence) && + Immutable.is(updatedK.trie, w)) + ? emptyTrie + : updatedK); + } else if (is_keyClose(key)) { + // We take care of this case later, after the + // target is fully constructed/rebuilt. + target = rupdate(target, key, updatedK); + } else { + target = rupdate(target, key, + (Immutable.is(updatedK, w) ? emptyTrie : updatedK)); + } + } + } + + if (is_emptyTrie(w2)) { + target = r1; + r2.forEach(function (val, key) { examineKey(key) }); + } else { + target = emptyTrie; + target = rupdate(target, __, w); + r1.forEach(function (val, key) { examineKey(key) }); + r2.forEach(function (val, key) { examineKey(key) }); + } + + // Here, the target is complete. If it has only two keys, + // one wild and one is_keyClose, and wild's continuation + // is a $WildcardSequence and the other continuation is + // identical to the sequence's continuation, then replace + // the whole thing with a nested $WildcardSequence. + // (We know w === rlookup(target, __) from before.) + // + // TODO: I suspect actually this applies even if there are + // more than two keys, so long as all their continuations + // are identical and there's at least one is_keyClose + // alongside a wild. + if (target.size === 2) { + var finalW = rlookup(target, __); + if (finalW instanceof $WildcardSequence) { + target.forEach(function (k, key) { + if ((key !== __) && is_keyClose(key)) { + if (Immutable.is(k, finalW.trie)) { + target = finalW; + return false; // terminate the iteration early + } + } + }); + } + } + + return target; + } + + function walkWild(key, k, w) { + if (is_emptyTrie(w)) return k; + if (is_keyOpen(key)) return walk(k, rwildseq(w)); + if (is_keyClose(key)) { + if (w instanceof $WildcardSequence) return walk(k, w.trie); + return k; + } + return walk(k, w); + } +} + +// Returns null on failed match, otherwise the appropriate success +// value contained in the trie r. +function matchValue(r, v) { + var failureResult = null; + + var vs = Immutable.List.of(v); + var stack = [Immutable.List()]; + + while (!is_emptyTrie(r)) { + if (r instanceof $WildcardSequence) { + if (stack.length === 0) return failureResult; + vs = stack.pop(); + r = r.trie; + continue; + } + + if (r instanceof $Success) { + if (vs.size === 0 && stack.length === 0) return r.value; + return failureResult; + } + + if (vs.size === 0) { + if (stack.length === 0) return failureResult; + vs = stack.pop(); + r = rlookup(r, EOA); + continue; + } + + var v = vs.first(); + vs = vs.shift(); + + if (typeof v === 'string' && v.substring(0, 2) === '__') { + die("Cannot match special string starting with __"); + } + + if (Array.isArray(v)) { + if (r.has(SOA)) { + r = rlookup(r, SOA); + stack.push(vs); + vs = Immutable.List(v); + } else { + r = rlookup(r, __); + } + } else { + if (r.has(v)) { + r = rlookup(r, v); + } else { + r = rlookup(r, __); + } + } + } + + return failureResult; +} + +function matchTrie(o1, o2, seed) { + var acc = typeof seed === 'undefined' ? Immutable.Set() : seed; // variable updated imperatively + walk(o1, o2); + return acc; + + function walkFlipped(r2, r1) { return walk(r1, r2); } + + function walk(r1, r2) { + if (is_emptyTrie(r1) || is_emptyTrie(r2)) return; + + if (r1 instanceof $WildcardSequence) { + if (r2 instanceof $WildcardSequence) { + walk(r1.trie, r2.trie); + return; + } + r1 = expandWildseq(r1.trie); + } else if (r2 instanceof $WildcardSequence) { + r2 = expandWildseq(r2.trie); + } + + if (r1 instanceof $Success && r2 instanceof $Success) { + acc = matchTrieSuccesses(r1.value, r2.value, acc); + return; + } + + var w1 = rlookup(r1, __); + var w2 = rlookup(r2, __); + walk(w1, w2); + + function examineKey(key) { + if (key !== __) { + var k1 = rlookup(r1, key); + var k2 = rlookup(r2, key); + if (is_emptyTrie(k1)) { + if (is_emptyTrie(k2)) { + return; + } else { + walkWild(walk, w1, key, k2); + } + } else { + if (is_emptyTrie(k2)) { + walkWild(walkFlipped, w2, key, k1); + } else { + walk(k1, k2); + } + } + } + } + + // Optimize similarly to intersect(). + if (is_emptyTrie(w1)) { + if (is_emptyTrie(w2)) { + (r1.size < r2.size ? r1 : r2).forEach(function (val, key) { examineKey(key) }); + } else { + r1.forEach(function (val, key) { examineKey(key) }); + } + } else { + if (is_emptyTrie(w2)) { + r2.forEach(function (val, key) { examineKey(key) }); + } else { + r1.forEach(function (val, key) { examineKey(key) }); + r2.forEach(function (val, key) { examineKey(key) }); + } + } + } + + function walkWild(walker, w, key, k) { + if (is_emptyTrie(w)) return; + if (is_keyOpen(key)) { + walker(rwildseq(w), k); + return; + } + if (is_keyClose(key)) { + if (w instanceof $WildcardSequence) walker(w.trie, k); + return; + } + walker(w, k); + } +} + +function appendTrie(m, mTailFn) { + return walk(m); + + function walk(m) { + if (is_emptyTrie(m)) return emptyTrie; + if (m instanceof $WildcardSequence) return rwildseq(walk(m.trie)); + if (m instanceof $Success) die("Ill-formed trie"); + + var target = emptyTrie; + m.forEach(function (k, key) { + if (is_keyClose(key) && (k instanceof $Success)) { + target = union(target, mTailFn(k.value)); + } else { + target = rupdate(target, key, walk(k)); + } + }); + return target; + } +} + +function relabel(m, f) { + return walk(m); + + function walk(m) { + if (is_emptyTrie(m)) return emptyTrie; + if (m instanceof $WildcardSequence) return rwildseq(walk(m.trie)); + if (m instanceof $Success) return rsuccess(f(m.value)); + + var target = emptyTrie; + m.forEach(function (k, key) { + target = rupdate(target, key, walk(k)); + }); + return target; + } +} + +function compileProjection(/* projection, projection, ... */) { + var names = []; + var acc = []; + for (var i = 0; i < arguments.length; i++) { + walk(arguments[i]); + } + acc.push(EOA); + return {names: names, spec: acc}; + + function walk(p) { + if (isCapture(p)) { + names.push(captureName(p)); + acc.push(SOC); + walk(capturePattern(p)); + acc.push(EOC); + return; + } + + if (Array.isArray(p)) { + acc.push(SOA); + for (var i = 0; i < p.length; i++) { + walk(p[i]); + } + acc.push(EOA); + return; + } + + if (p instanceof $Embedded) { + die("Cannot embed trie in projection"); + } else { + acc.push(p); + } + } +} + +function projectionToPattern(p) { + return walk(p); + + function walk(p) { + if (isCapture(p)) return walk(capturePattern(p)); + + if (Array.isArray(p)) { + var result = []; + for (var i = 0; i < p.length; i++) { + result.push(walk(p[i])); + } + return result; + } + + if (p instanceof $Embedded) { + return p.trie; + } else { + return p; + } + } +} + +function project(m, compiledProjection) { + var spec = compiledProjection.spec; + return walk(false, m, 0); + + function walk(isCapturing, m, specIndex) { + if (specIndex >= spec.length) { + if (isCapturing) die("Bad specification: unclosed capture"); + if (m instanceof $Success) { + return rseq(EOA, rsuccess(projectSuccess(m.value))); + } else { + return emptyTrie; + } + } + + if (is_emptyTrie(m)) return emptyTrie; + + var item = spec[specIndex]; + var nextIndex = specIndex + 1; + + if (item === EOC) { + if (!isCapturing) die("Bad specification: unexpected EOC"); + return walk(false, m, nextIndex); + } + + if (item === SOC) { + if (isCapturing) die("Bad specification: nested capture"); + return walk(true, m, nextIndex); + } + + if (item === __) { + if (m instanceof $WildcardSequence) { + if (isCapturing) { + return rwild(walk(isCapturing, m, nextIndex)); + } else { + return walk(isCapturing, m, nextIndex); + } + } + + if (m instanceof $Success) { + return emptyTrie; + } + + var target; + if (isCapturing) { + target = emptyTrie; + target = rupdate(target, __, walk(isCapturing, rlookup(m, __), nextIndex)); + m.forEach(function (mk, key) { + if (key !== __) { + if (is_keyOpen(key)) { + function cont(mk2) { return walk(isCapturing, mk2, nextIndex); } + target = rupdate(target, key, captureNested(mk, cont)); + } else if (is_keyClose(key)) { + // do nothing + } else { + target = rupdate(target, key, walk(isCapturing, mk, nextIndex)); + } + } + }); + } else { + target = walk(isCapturing, rlookup(m, __), nextIndex); + m.forEach(function (mk, key) { + if (key !== __) { + if (is_keyOpen(key)) { + function cont(mk2) { return walk(isCapturing, mk2, nextIndex); } + target = union(target, skipNested(mk, cont)); + } else if (is_keyClose(key)) { + // do nothing + } else { + target = union(target, walk(isCapturing, mk, nextIndex)); + } + } + }); + } + return target; + } + + var result; + if (m instanceof $WildcardSequence) { + if (is_keyOpen(item)) { + result = walk(isCapturing, rwildseq(m), nextIndex); + } else if (is_keyClose(item)) { + result = walk(isCapturing, m.trie, nextIndex); + } else { + result = walk(isCapturing, m, nextIndex); + } + } else if (m instanceof $Success) { + result = emptyTrie; + } else { + if (is_keyOpen(item)) { + result = walk(isCapturing, rwildseq(rlookup(m, __)), nextIndex); + } else if (is_keyClose(item)) { + result = emptyTrie; + } else { + result = walk(isCapturing, rlookup(m, __), nextIndex); + } + result = union(result, walk(isCapturing, rlookup(m, item), nextIndex)); + } + if (isCapturing) { + result = rseq(item, result); + } + return result; + } + + function captureNested(m, cont) { + if (m instanceof $WildcardSequence) { + return rwildseq(cont(m.trie)); + } + + if (is_emptyTrie(m) || (m instanceof $Success)) { + return emptyTrie; + } + + var target = emptyTrie; + target = rupdate(target, __, captureNested(rlookup(m, __), cont)); + m.forEach(function (mk, key) { + if (key !== __) { + if (is_keyOpen(key)) { + function cont2(mk2) { return captureNested(mk2, cont); } + rupdateInplace(target, key, captureNested(mk, cont2)); + } else if (is_keyClose(key)) { + rupdateInplace(target, key, cont(mk)); + } else { + rupdateInplace(target, key, captureNested(mk, cont)); + } + } + }); + return target; + } + + function skipNested(m, cont) { + if (m instanceof $WildcardSequence) { + return cont(m.trie); + } + + if (is_emptyTrie(m) || (m instanceof $Success)) { + return emptyTrie; + } + + var target = skipNested(rlookup(m, __), cont); + m.forEach(function (mk, key) { + if (key !== __) { + if (is_keyOpen(key)) { + function cont2(mk2) { return skipNested(mk2, cont); } + target = union(target, skipNested(mk, cont2)); + } else if (is_keyClose(key)) { + target = union(target, cont(mk)); + } else { + target = union(target, skipNested(mk, cont)); + } + } + }); + return target; + } +} + +function trieKeys(m) { + if (is_emptyTrie(m)) return []; + var result = walkSeq(m, function (vss, vsk) { return vss; }); + if (result === null) return null; + return result.map(function (vs) { return vs.toArray() }); + + function walk(m, k) { + if (m instanceof $WildcardSequence) return null; + if (m instanceof $Success) return []; + if (m.has(__)) return null; + var acc = []; + m.forEach(function (mk, key) { + var piece; + if (is_keyOpen(key)) { + function seqK(vss, vsk) { + var acc = []; + for (var i = 0; i < vss.length; i++) { + var vs = vss[i]; + acc = acc.concat(k(transformSeqs(vs, key), vsk)); + } + return acc; + } + piece = walkSeq(mk, seqK); + } else if (is_keyClose(key)) { + die("trieKeys: internal error: unexpected key-close"); + } else { + piece = k(key, mk); + } + if (piece === null) return null; + acc = acc.concat(piece); + }); + return acc; + } + + function walkSeq(m, k) { + if (m instanceof $WildcardSequence) return null; + if (m instanceof $Success) return k([], emptyTrie); // TODO: ?? + if (m.has(__)) return null; + var acc = []; + m.forEach(function (mk, key) { + var piece; + if (is_keyClose(key)) { + piece = k([Immutable.List()], mk); + } else { + function outerK(v, vk) { + return walkSeq(vk, function (vss, vsk) { + var acc = []; + for (var i = 0; i < vss.length; i++) { + acc.push(vss[i].unshift(v)); + } + return k(acc, vsk); + }); + } + piece = walk(rseq(key, mk), outerK); + } + if (piece === null) return null; + acc = acc.concat(piece); + }); + return acc; + } + + function transformSeqs(vs, opener) { + if (opener === SOA) return vs; + die("Internal error: unknown opener " + opener); + } +} + +function trieKeysToObjects(trieKeysResult, compiledProjection) { + if (trieKeysResult === null) return null; + var result = []; + for (var i = 0; i < trieKeysResult.length; i++) { + var e = trieKeysResult[i]; + var d = {}; + for (var j = 0; j < e.length; j++) { + d[compiledProjection.names[j] || ('$' + j)] = e[j]; + } + result.push(d); + } + return result; +} + +function projectObjects(m, compiledProjection) { + return trieKeysToObjects(trieKeys(project(m, compiledProjection)), compiledProjection); +} + +function prettyTrie(m, initialIndent) { + var acc = []; + walk(initialIndent || 0, m); + return acc.join(''); + + function walk(i, m) { + if (m instanceof $WildcardSequence) { + acc.push("...>"); + walk(i + 4, m.trie); + return; + } + if (m instanceof $Success) { + var v = m.value; + if (Immutable.Set.isSet(v)) { v = v.toArray(); } + acc.push("{" + JSON.stringify(v) + "}"); + return; + } + + if (m.size === 0) { + acc.push("::: no further matches possible"); + return; + } + + var needSep = false; + m.toOrderedMap() + .sortBy(function (k, key) { return key }) + .forEach(function (k, key) { + if (needSep) { + acc.push("\n"); + acc.push(indentStr(i)); + } else { + needSep = true; + } + acc.push(" "); + if (key === __) key = '★'; + else if (key === SOA) key = '<'; + else if (key === EOA) key = '>'; + else key = JSON.stringify(key); + acc.push(key); + walk(i + key.length + 1, k); + }); + } + + function indentStr(i) { + return new Array(i + 1).join(' '); // eww + } +} + +/////////////////////////////////////////////////////////////////////////// + +module.exports.__ = __; +module.exports.$Capture = $Capture; +module.exports._$ = _$; +module.exports.is_emptyTrie = is_emptyTrie; +module.exports.emptyTrie = emptyTrie; +module.exports.embeddedTrie = embeddedTrie; +module.exports.compilePattern = compilePattern; +module.exports.matchPattern = matchPattern; +module.exports.union = unionN; +module.exports.intersect = intersect; +module.exports.subtract = subtract; +module.exports.matchValue = matchValue; +module.exports.matchTrie = matchTrie; +module.exports.appendTrie = appendTrie; +module.exports.relabel = relabel; +module.exports.compileProjection = compileProjection; +module.exports.projectionToPattern = projectionToPattern; +module.exports.project = project; +module.exports.trieKeys = trieKeys; +module.exports.trieKeysToObjects = trieKeysToObjects; +module.exports.projectObjects = projectObjects; +module.exports.prettyTrie = prettyTrie; diff --git a/js/src/syndicate.js b/js/src/syndicate.js new file mode 100644 index 0000000..8093006 --- /dev/null +++ b/js/src/syndicate.js @@ -0,0 +1,27 @@ +var Route = require("./route.js"); +var Util = require("./util.js"); + +/////////////////////////////////////////////////////////////////////////// + +/*---------------------------------------------------------------------------*/ +/* Events and Actions */ + +var __ = Route.__; +var _$ = Route._$; + +/////////////////////////////////////////////////////////////////////////// + +module.exports.__ = __; +module.exports._$ = _$; + +// module.exports.sub = sub; +// module.exports.pub = pub; +// module.exports.spawn = spawn; +// module.exports.updateRoutes = updateRoutes; +// module.exports.sendMessage = sendMessage; +// module.exports.shutdownWorld = shutdownWorld; + +// module.exports.World = World; +// module.exports.DemandMatcher = DemandMatcher; +// module.exports.Deduplicator = Deduplicator; +module.exports.Route = Route; diff --git a/js/src/util.js b/js/src/util.js new file mode 100644 index 0000000..af781ee --- /dev/null +++ b/js/src/util.js @@ -0,0 +1,23 @@ +var Reflect = require("./reflect.js"); + +module.exports.extend = function (what, _with) { + for (var prop in _with) { + if (_with.hasOwnProperty(prop)) { + what[prop] = _with[prop]; + } + } + return what; +}; + +module.exports.kwApply = function (f, thisArg, args) { + var formals = Reflect.formalParameters(f); + var actuals = [] + for (var i = 0; i < formals.length; i++) { + var formal = formals[i]; + if (!(formal in args)) { + throw new Error("Function parameter '"+formal+"' not present in args"); + } + actuals.push(args[formal]); + } + return f.apply(thisArg, actuals); +}; diff --git a/js/test/test-route.js b/js/test/test-route.js new file mode 100644 index 0000000..2e4e25c --- /dev/null +++ b/js/test/test-route.js @@ -0,0 +1,380 @@ +var Immutable = require('immutable'); +var expect = require('expect.js'); +var util = require('util'); +var r = require("../src/route.js"); + +function checkPrettyTrie(m, expected) { + expect(r.prettyTrie(m)).to.equal(expected.join('\n')); +} + +function checkTrieKeys(actual, expected) { + expect((Immutable.Set(actual).map(Immutable.List)) + .equals(Immutable.Set(expected).map(Immutable.List))).to.be(true); +} + +describe("basic pattern compilation", function () { + var sAny = Immutable.Set(['mAny']); + var sAAny = Immutable.Set(['mAAny']); + var mAny = r.compilePattern(sAny, r.__); + var mAAny = r.compilePattern(sAAny, ['A', r.__]); + + it("should print as expected", function () { + checkPrettyTrie(mAny, [' ★ >{["mAny"]}']); + checkPrettyTrie(mAAny, [' < "A" ★ > >{["mAAny"]}']); + }); + + describe("of wildcard", function () { + it("should match anything", function () { + expect(r.matchValue(mAny, 'hi')).to.eql(sAny); + expect(r.matchValue(mAny, ['A', 'hi'])).to.eql(sAny); + expect(r.matchValue(mAny, ['B', 'hi'])).to.eql(sAny); + expect(r.matchValue(mAny, ['A', [['hi']]])).to.eql(sAny); + }); + }); + + describe("of A followed by wildcard", function () { + it("should match A followed by anything", function () { + expect(r.matchValue(mAAny, 'hi')).to.be(null); + expect(r.matchValue(mAAny, ['A', 'hi'])).to.eql(sAAny); + expect(r.matchValue(mAAny, ['B', 'hi'])).to.be(null); + expect(r.matchValue(mAAny, ['A', [['hi']]])).to.eql(sAAny); + }); + }); + + it("should observe basic (in)equivalences", function () { + expect(Immutable.is(mAny, mAAny)).to.be(false); + expect(Immutable.is(mAny, mAny)).to.be(true); + expect(Immutable.is(mAAny, mAAny)).to.be(true); + }); +}); + +describe("unions", function () { + it("should collapse common prefix wildcard", function () { + checkPrettyTrie(r.union(r.compilePattern(Immutable.Set(['A']), [r.__, 'A']), + r.compilePattern(Immutable.Set(['B']), [r.__, 'B'])), + [' < ★ "A" > >{["A"]}', + ' "B" > >{["B"]}']); + }); + + it("should unroll wildcard unioned with nonwildcard", function () { + checkPrettyTrie(r.union(r.compilePattern(Immutable.Set(['A']), [r.__, 'A']), + r.compilePattern(Immutable.Set(['W']), r.__)), + [' ★ >{["W"]}', + ' < ★ "A" ★...> >{["W"]}', + ' > >{["A","W"]}', + ' ★...> >{["W"]}', + ' > >{["W"]}', + ' > >{["W"]}']); + }); + + it("should properly multiply out", function () { + checkPrettyTrie(r.union(r.compilePattern(Immutable.Set(['A']), [r.__, 2]), + r.compilePattern(Immutable.Set(['C']), [1, 3]), + r.compilePattern(Immutable.Set(['B']), [3, 4])), + [' < ★ 2 > >{["A"]}', + ' 1 2 > >{["A"]}', + ' 3 > >{["C"]}', + ' 3 2 > >{["A"]}', + ' 4 > >{["B"]}']); + + checkPrettyTrie(r.union(r.compilePattern(Immutable.Set(['C']), [1, 3]), + r.compilePattern(Immutable.Set(['B']), [3, 4])), + [' < 1 3 > >{["C"]}', + ' 3 4 > >{["B"]}']); + + checkPrettyTrie(r.union(r.compilePattern(Immutable.Set(['A']), [r.__, 2]), + r.compilePattern(Immutable.Set(['C']), [1, 3])), + [' < ★ 2 > >{["A"]}', + ' 1 2 > >{["A"]}', + ' 3 > >{["C"]}']); + + checkPrettyTrie(r.union(r.compilePattern(Immutable.Set(['A']), [r.__, 2]), + r.compilePattern(Immutable.Set(['B']), [3, 4])), + [' < ★ 2 > >{["A"]}', + ' 3 2 > >{["A"]}', + ' 4 > >{["B"]}']); + }); + + it("should correctly construct intermediate values", function () { + var MU = r.emptyTrie; + MU = r.union(MU, r.compilePattern(Immutable.Set(['A']), [r.__, 2])); + checkPrettyTrie(MU, [' < ★ 2 > >{["A"]}']); + MU = r.union(MU, r.compilePattern(Immutable.Set(['C']), [1, 3])); + checkPrettyTrie(MU, [' < ★ 2 > >{["A"]}', + ' 1 2 > >{["A"]}', + ' 3 > >{["C"]}']); + MU = r.union(MU, r.compilePattern(Immutable.Set(['B']), [3, 4])); + checkPrettyTrie(MU, [' < ★ 2 > >{["A"]}', + ' 1 2 > >{["A"]}', + ' 3 > >{["C"]}', + ' 3 2 > >{["A"]}', + ' 4 > >{["B"]}']); + }); + + it("should handle identical patterns with different pids", function () { + var m = r.union(r.compilePattern(Immutable.Set('B'), [2]), + r.compilePattern(Immutable.Set('C'), [3])); + checkPrettyTrie(m, [' < 2 > >{["B"]}', + ' 3 > >{["C"]}']); + m = r.union(r.compilePattern(Immutable.Set('A'), [2]), m); + checkPrettyTrie(m, [' < 2 > >{["A","B"]}', + ' 3 > >{["C"]}']); + }); +}); + +describe("projections", function () { + describe("with picky structure", function () { + var proj = r.compileProjection(r._$("v", [[r.__]])); + + it("should include things that match as well as wildcards", function () { + checkPrettyTrie(r.project(r.union(r.compilePattern(Immutable.Set(['A']), r.__), + r.compilePattern(Immutable.Set(['B']), [['b']])), + proj), + [' < < ★ > > >{["A"]}', + ' "b" > > >{["B","A"]}']); + }); + + it("should exclude things that lack the required structure", function () { + checkPrettyTrie(r.project(r.union(r.compilePattern(Immutable.Set(['A']), r.__), + r.compilePattern(Immutable.Set(['B']), ['b'])), + proj), + [' < < ★ > > >{["A"]}']); + }); + }); + + describe("simple positional", function () { + var proj = r.compileProjection([r._$, r._$]); + + it("should collapse common prefixes", function () { + checkPrettyTrie(r.project(r.union(r.compilePattern(Immutable.Set(['A']), [1, 2]), + r.compilePattern(Immutable.Set(['C']), [1, 3]), + r.compilePattern(Immutable.Set(['B']), [3, 4])), + proj), + [' 1 2 >{["A"]}', + ' 3 >{["C"]}', + ' 3 4 >{["B"]}']); + }); + + it("should yield a correct set of results", function () { + var u = r.union(r.compilePattern(Immutable.Set(['A']), [1, 2]), + r.compilePattern(Immutable.Set(['C']), [1, 3]), + r.compilePattern(Immutable.Set(['B']), [3, 4])); + checkTrieKeys(r.trieKeys(r.project(u, proj)), [[1, 2], [1, 3], [3, 4]]); + }); + }); +}); + +describe("subtract after union", function () { + var R1 = r.compilePattern(Immutable.Set(['A']), [r.__, "B"]); + var R2 = r.compilePattern(Immutable.Set(['B']), ["A", r.__]); + var R12 = r.union(R1, R2); + + it("should have sane preconditions", function () { // Am I doing this right? + checkPrettyTrie(R1, [' < ★ "B" > >{["A"]}']); + checkPrettyTrie(R2, [' < "A" ★ > >{["B"]}']); + checkPrettyTrie(R12, [' < "A" "B" > >{["B","A"]}', + ' ★ > >{["B"]}', + ' ★ "B" > >{["A"]}']); + }); + + it("should yield the remaining ingredients of the union", function () { + expect(Immutable.is(r.subtract(R12, R1), R2)).to.be(true); + expect(Immutable.is(r.subtract(R12, R2), R1)).to.be(true); + expect(Immutable.is(r.subtract(R12, R1), R1)).to.be(false); + }); +}); + +describe("trie equality", function () { + it("should not rely on object identity", function () { + expect(Immutable.is(r.union(r.compilePattern(Immutable.Set(['A']), [r.__, 'A']), + r.compilePattern(Immutable.Set(['B']), [r.__, 'B'])), + r.union(r.compilePattern(Immutable.Set(['A']), [r.__, 'A']), + r.compilePattern(Immutable.Set(['B']), [r.__, 'B'])))) + .to.be(true); + }); + + it("should respect commutativity of union", function () { + expect(Immutable.is(r.union(r.compilePattern(Immutable.Set(['A']), [r.__, 'A']), + r.compilePattern(Immutable.Set(['B']), [r.__, 'B'])), + r.union(r.compilePattern(Immutable.Set(['B']), [r.__, 'B']), + r.compilePattern(Immutable.Set(['A']), [r.__, 'A'])))) + .to.be(true); + }); +}); + +describe("trieKeys on wild tries", function () { + var M = r.union(r.compilePattern(Immutable.Set(['A']), [r.__, 2]), + r.compilePattern(Immutable.Set(['C']), [1, 3]), + r.compilePattern(Immutable.Set(['B']), [3, 4])); + + it("should yield null to signal an infinite result", function () { + expect(r.trieKeys(r.project(M, r.compileProjection([r._$, r._$])))).to.be(null); + }); + + it("should extract just the second array element successfully", function () { + checkTrieKeys(r.trieKeys(r.project(M, r.compileProjection([r.__, r._$]))), + [[2],[3],[4]]); + }); + + var M2 = r.project(M, r.compileProjection([r._$, r._$])); + + it("should survive double-projection", function () { + checkTrieKeys(r.trieKeys(r.project(M2, r.compileProjection(r.__, r._$))), + [[2],[3],[4]]); + }); + + it("should survive embedding and reprojection", function () { + checkTrieKeys(r.trieKeys(r.project(r.compilePattern(true, [r.embeddedTrie(M2)]), + r.compileProjection([r.__, r._$]))), + [[2],[3],[4]]); + checkTrieKeys(r.trieKeys(r.project(r.compilePattern(true, [[r.embeddedTrie(M2)]]), + r.compileProjection([[r.__, r._$]]))), + [[2],[3],[4]]); + }); +}); + +describe("trieKeys using multiple-values in projections", function () { + var M = r.union(r.compilePattern(Immutable.Set(['A']), [1, 2]), + r.compilePattern(Immutable.Set(['C']), [1, 3]), + r.compilePattern(Immutable.Set(['B']), [3, 4])); + var proj = r.compileProjection([r._$, r._$]); + var M2 = r.project(M, proj); + + it("should be able to extract ordinary values", function () { + checkTrieKeys(r.trieKeys(M2), [[1,2],[1,3],[3,4]]); + }); + + it("should be able to be reprojected as a sequence of more than one value", function () { + checkTrieKeys(r.trieKeys(r.project(M2, r.compileProjection(r._$, r._$))), + [[1,2],[1,3],[3,4]]); + }); + + it("should be convertible into objects with $-indexed fields", function () { + expect(r.trieKeysToObjects(r.trieKeys(M2), proj)) + .to.eql([{'$0': 3, '$1': 4}, {'$0': 1, '$1': 2}, {'$0': 1, '$1': 3}]); + expect(r.projectObjects(M, proj)) + .to.eql([{'$0': 3, '$1': 4}, {'$0': 1, '$1': 2}, {'$0': 1, '$1': 3}]); + }); +}); + +describe("trieKeys using multiple-values in projections, with names", function () { + var M = r.union(r.compilePattern(Immutable.Set(['A']), [1, 2]), + r.compilePattern(Immutable.Set(['C']), [1, 3]), + r.compilePattern(Immutable.Set(['B']), [3, 4])); + + it("should yield named fields", function () { + expect(r.projectObjects(M, r.compileProjection([r._$("fst"), r._$("snd")]))) + .to.eql([{'fst': 3, 'snd': 4}, {'fst': 1, 'snd': 2}, {'fst': 1, 'snd': 3}]); + }); + + it("should yield numbered fields where names are missing", function () { + expect(r.projectObjects(M, r.compileProjection([r._$, r._$("snd")]))) + .to.eql([{'$0': 3, 'snd': 4}, {'$0': 1, 'snd': 2}, {'$0': 1, 'snd': 3}]); + expect(r.projectObjects(M, r.compileProjection([r._$("fst"), r._$]))) + .to.eql([{'fst': 3, '$1': 4}, {'fst': 1, '$1': 2}, {'fst': 1, '$1': 3}]); + }); +}); + +describe("complex erasure", function () { + var A = r.compilePattern(Immutable.Set(['A']), r.__); + var B = r.union(r.compilePattern(Immutable.Set(['B']), [[[["foo"]]]]), + r.compilePattern(Immutable.Set(['B']), [[[["bar"]]]])); + describe("after a union", function () { + var R0 = r.union(A, B); + var R1a = r.subtract(R0, B); + var R1b = r.subtract(R0, A); + + it("should yield the other parts of the union", function () { + expect(Immutable.is(R1a, A)).to.be(true); + expect(Immutable.is(R1b, B)).to.be(true); + }); + }); +}); + +describe("embedding tries in patterns", function () { + var M1a = + r.compilePattern(Immutable.Set(['A']), + [1, r.embeddedTrie(r.compilePattern(Immutable.Set(['B']), [2, 3])), 4]); + var M1b = + r.compilePattern(Immutable.Set(['A']), [1, [2, 3], 4]); + var M2a = + r.compilePattern(Immutable.Set(['A']), + [r.embeddedTrie(r.compilePattern(Immutable.Set(['B']), [1, 2])), + r.embeddedTrie(r.compilePattern(Immutable.Set(['C']), [3, 4]))]); + var M2b = + r.compilePattern(Immutable.Set(['A']), [[1, 2], [3, 4]]); + + it("should yield tries equivalent to the original patterns", function () { + expect(Immutable.is(M1a, M1b)).to.be(true); + expect(Immutable.is(M2a, M2b)).to.be(true); + }); +}); + +describe("calls to matchPattern", function () { + it("should yield appropriately-named/-numbered fields", function () { + expect(r.matchPattern([1, 2, 3], [r.__, 2, r._$])).to.eql({'$0': 3, 'length': 1}); + expect(r.matchPattern([1, 2, 3], [r.__, 2, r._$("three")])).to.eql({'three': 3, 'length': 1}); + expect(r.matchPattern([1, 2, 3], [r._$, 2, r._$("three")])) + .to.eql({'$0': 1, 'three': 3, 'length': 2}); + expect(r.matchPattern([1, 2, 3], [r._$("one"), 2, r._$])) + .to.eql({'one': 1, '$1': 3, 'length': 2}); + expect(r.matchPattern([1, 2, 3], [r._$("one"), 2, r._$("three")])) + .to.eql({'one': 1, 'three': 3, 'length': 2}); + }); + + it("should fail on value mismatch", function () { + expect(r.matchPattern([1, 2, 3], [r.__, 999, r._$("three")])).to.be(null); + }); + + it("should fail on array length mismatch", function () { + expect(r.matchPattern([1, 2, 3], [r.__, 2, r._$("three"), 4])).to.be(null); + }); + + it("matches substructure", function () { + expect(r.matchPattern([1, [2, 999], 3], [r._$("one"), r._$(null, [2, r.__]), r._$("three")])) + .to.eql({ one: 1, '$1': [ 2, 999 ], three: 3, length: 3 }); + expect(r.matchPattern([1, [2, 999], 3], [r._$("one"), r._$("two", [2, r.__]), r._$("three")])) + .to.eql({ one: 1, two: [ 2, 999 ], three: 3, length: 3 }); + expect(r.matchPattern([1, [999, 2], 3], [r._$("one"), r._$(null, [2, r.__]), r._$("three")])) + .to.be(null); + expect(r.matchPattern([1, [999, 2], 3], [r._$("one"), r._$("two", [2, r.__]), r._$("three")])) + .to.be(null); + }); + + it("matches nested captures", function () { + expect(r.matchPattern([1, [2, 999], 3], [r._$("one"), r._$(null, [2, r._$]), r._$("three")])) + .to.eql({ one: 1, '$2': 999, '$1': [ 2, 999 ], three: 3, length: 4 }); + expect(r.matchPattern([1, [2, 999], 3], [r._$("one"), r._$("two", [2, r._$]), r._$("three")])) + .to.eql({ one: 1, '$2': 999, two: [ 2, 999 ], three: 3, length: 4 }); + }); +}); + +describe("Projection with no captures", function () { + it("should yield the empty sequence when there's a match", function () { + var emptySequence = [' >{["A"]}']; + + checkPrettyTrie(r.project(r.compilePattern(Immutable.Set(['A']), ["X", r.__]), + r.compileProjection(r.__)), + emptySequence); + checkPrettyTrie(r.project(r.compilePattern(Immutable.Set(['A']), ["X", r.__]), + r.compileProjection([r.__, r.__])), + emptySequence); + checkPrettyTrie(r.project(r.compilePattern(Immutable.Set(['A']), ["X", r.__]), + r.compileProjection(["X", r.__])), + emptySequence); + }); + + it("should yield the empty trie when there's no match", function () { + expect(r.project(r.compilePattern(Immutable.Set(['A']), ["X", r.__]), + r.compileProjection(["Y", r.__]))).to.be(r.emptyTrie); + }); + + it("should yield nonempty sequences when there are captures after all", function () { + checkPrettyTrie(r.project(r.compilePattern(Immutable.Set(['A']), ["X", r.__]), + r.compileProjection([r.__, r._$])), + [' ★ >{["A"]}']); + checkPrettyTrie(r.project(r.compilePattern(Immutable.Set(['A']), ["X", r.__]), + r.compileProjection([r._$, r._$])), + [' "X" ★ >{["A"]}']); + }); +}); 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