[Pkg-javascript-commits] [node-leveldown] 319/492: browserify shim so levelup can run in the browser

[Andrew Kelley]

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andrewrk-guest pushed a commit to annotated tag rocksdb-0.10.1
in repository node-leveldown.

commit 4b3d9de6acc0a6b01d9eab8e7f24cfc24d890964
Author: No9 <antonwhalley at vodafone.ie>
Date:   Thu May 2 23:42:03 2013 +0100

    browserify shim so levelup can run in the browser
---
 index-shim.js | 116 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 package.json  |   5 ++-
 2 files changed, 120 insertions(+), 1 deletion(-)

diff --git a/index-shim.js b/index-shim.js
new file mode 100644
index 0000000..34c6d01
--- /dev/null
+++ b/index-shim.js
@@ -0,0 +1,116 @@
+
+/**
+ * Module dependencies.
+ */
+
+var fs = require('fs')
+  , path = require('path')
+  , join = path.join
+  , dirname = path.dirname
+  , exists = fs.existsSync || path.existsSync
+  , defaults = {
+        arrow: process.env.NODE_BINDINGS_ARROW || ' → '
+      , compiled: process.env.NODE_BINDINGS_COMPILED_DIR || 'compiled'
+      , platform: process.platform
+      , arch: process.arch
+      , version: "1.0"
+      , bindings: 'bindings.node'
+      , try: [
+          // node-gyp's linked version in the "build" dir
+          [ 'module_root', 'build', 'bindings' ]
+          // node-waf and gyp_addon (a.k.a node-gyp)
+        , [ 'module_root', 'build', 'Debug', 'bindings' ]
+        , [ 'module_root', 'build', 'Release', 'bindings' ]
+          // Debug files, for development (legacy behavior, remove for node v0.9)
+        , [ 'module_root', 'out', 'Debug', 'bindings' ]
+        , [ 'module_root', 'Debug', 'bindings' ]
+          // Release files, but manually compiled (legacy behavior, remove for node v0.9)
+        , [ 'module_root', 'out', 'Release', 'bindings' ]
+        , [ 'module_root', 'Release', 'bindings' ]
+          // Legacy from node-waf, node <= 0.4.x
+        , [ 'module_root', 'build', 'default', 'bindings' ]
+          // Production "Release" buildtype binary (meh...)
+        , [ 'module_root', 'compiled', 'version', 'platform', 'arch', 'bindings' ]
+        ]
+    }
+
+/**
+ * The main `bindings()` function loads the compiled bindings for a given module.
+ * It uses V8's Error API to determine the parent filename that this function is
+ * being invoked from, which is then used to find the root directory.
+ */
+
+function bindings (opts) {
+
+  var mock = {}
+  function leveldown (){
+    this.open = function(){}
+  }
+  mock.leveldown = new leveldown
+  return mock  
+}
+
+
+module.exports = exports = bindings
+
+
+/**
+ * Gets the filename of the JavaScript file that invokes this function.
+ * Used to help find the root directory of a module.
+ */
+
+exports.getFileName = function getFileName () {
+  var origPST = Error.prepareStackTrace
+    , dummy = {}
+    , fileName
+
+  Error.prepareStackTrace = function (e, st) {
+    for (var i=0, l=st.length; i<l; i++) {
+      fileName = st[i].getFileName()
+      if (fileName !== __filename) {
+        return
+      }
+    }
+  }
+
+  // run the 'prepareStackTrace' function above
+  Error.captureStackTrace(dummy)
+  dummy.stack
+
+  // cleanup
+  Error.prepareStackTrace = origPST
+
+  return fileName
+}
+
+/**
+ * Gets the root directory of a module, given an arbitrary filename
+ * somewhere in the module tree. The "root directory" is the directory
+ * containing the `package.json` file.
+ *
+ *   In:  /home/nate/node-native-module/lib/index.js
+ *   Out: /home/nate/node-native-module
+ */
+
+exports.getRoot = function getRoot (file) {
+  var dir = dirname(file)
+    , prev
+  while (true) {
+    if (dir === '.') {
+      // Avoids an infinite loop in rare cases, like the REPL
+      dir = process.cwd()
+    }
+    if (exists(join(dir, 'package.json')) || exists(join(dir, 'node_modules'))) {
+      // Found the 'package.json' file or 'node_modules' dir; we're done
+      return dir
+    }
+    if (prev === dir) {
+      // Got to the top
+      throw new Error('Could not find module root given file: "' + file
+                    + '". Do you have a `package.json` file? ')
+    }
+    // Try the parent dir next
+    prev = dir
+    dir = join(dir, '..')
+  }
+}
diff --git a/package.json b/package.json
index c56ef7c..731c509 100644
--- a/package.json
+++ b/package.json
@@ -34,6 +34,9 @@
   , "scripts"         : {
         "test"            : "tap test/*-test.js --stderr"
     }
-  , "license"         : "MIT"
+  , "browser": {
+    "bindings": "./index-shim.js"
+  },
+   "license"         : "MIT"
   , "gypfile"         : true
 }

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