Add options to use cli.pl instead of pre-compiled cli.exe in node.js …

…interface (workaround for issue #87)

README.md

@@ -52,6 +52,10 @@ xsd2json(filename, function(err, schemaObject) {
 });
 ```
 
+In addition to the [command line options provided by the Prolog module](https://github.com/fnogatz/xsd2json/tree/master/lib-pl#synopsis), there are the following options available in the node.js module:
+- `noExe: true | false (default)`: Use the native Prolog interface instead of the pre-compiled `cli.exe`. This might be useful for MacOS users (see [issue #87](https://github.com/fnogatz/xsd2json/issues/87) for more details).
+- `swi: 'swipl' (default)`: Executable to call SWI-Prolog.
+
 ## Usage with Prolog
 
 xsd2json provides a predicate `xsd2json(+XSD,-JSON)`, which holds for a given XML Schema (either file path, URL or `stream`). For instructions on how to use xsd2json programmatically in Prolog, have a look at the Prolog module's [Readme](https://github.com/fnogatz/xsd2json/tree/master/lib-pl).

index.js

@@ -5,6 +5,13 @@ var concat = require('concat-stream')
 var path = require('path')
 
 var CLI = path.resolve(__dirname, 'lib-pl', 'cli.exe')
+var CLIPL = path.resolve(__dirname, 'lib-pl', 'cli.pl')
+var SWI = 'swipl'
+
+var reservedKeys = [
+  'noExe',
+  'swi'
+]
 
 function xsd2json (filename, options, callback) {
   if (arguments.length === 1) {
@@ -21,11 +28,27 @@ function xsd2json (filename, options, callback) {
 
   var spawnArgs = []
   for (var key in options) {
+    if (reservedKeys.indexOf(key) >= 0) {
+      continue
+    }
+
     spawnArgs.push('--' + key + '=' + options[key])
   }
   spawnArgs.push(filename)
 
-  var outputStream = childProcess.spawn(CLI, spawnArgs)
+  var outputStream
+  if (options.noExe) {
+    spawnArgs = [
+      '-g',
+      'main',
+      CLIPL,
+      '--'
+    ].concat(spawnArgs)
+
+    outputStream = childProcess.spawn(options.swi || SWI, spawnArgs)
+  } else {
+    outputStream = childProcess.spawn(CLI, spawnArgs)
+  }
 
   if (typeof callback !== 'function') {
     // no callback given --> return stream

package.json

@@ -10,10 +10,11 @@
     "prepublish": "git checkout -- lib-pl/cli.exe",
     "create-qlf": "swipl -O --goal=main -o lib-pl/cli.exe -c lib-pl/cli.pl",
     "standard": "standard",
-    "test": "npm run standard && npm run test-cli && npm run test-converter",
+    "test": "npm run standard && npm run test-cli && npm run test-converter && npm run test-api",
     "test-cli": "./lib-pl/cli.exe --version && ./lib-pl/cli.exe test/xsd/all_element.xsd",
     "test-converter": "node test/index.js interpreted",
-    "test-examples": "node test/index.js validate-json"
+    "test-examples": "node test/index.js validate-json",
+    "test-api": "node test/api.js"
   },
   "keywords": [
     "XML Schema",

test/api.js

@@ -0,0 +1,39 @@
+var assert = require('assert')
+var path = require('path')
+
+var async = require('async')
+
+var xsd2json = require('../index')
+
+async.parallel([
+  function (cb) {
+    xsd2json(path.resolve(__dirname, 'xsd', 'schema.xsd'), {}, function (err, res) {
+      if (err) {
+        process.exit(1)
+      }
+
+      assert.deepStrictEqual(res, { type: 'string' })
+
+      cb(null, res)
+    })
+  },
+  function (cb) {
+    xsd2json(path.resolve(__dirname, 'xsd', 'schema.xsd'), { noExe: true }, function (err, res) {
+      if (err) {
+        console.log(err)
+        process.exit(1)
+      }
+
+      assert.deepStrictEqual(res, { type: 'string' })
+
+      cb(null, res)
+    })
+  }
+], function (err, results) {
+  if (err) {
+    process.exit(1)
+  }
+
+  console.log(results)
+  process.exit(0)
+})