update build and query functions, add prepublish script

Author: kevinbarabash

Diff for: .babelrc

@@ -0,0 +1,6 @@
+{
+    "presets": ["es2015"],
+    "plugins": [
+        "transform-object-rest-spread"
+    ]
+}

Diff for: .gitignore

@@ -0,0 +1,2 @@
+node_modules
+dist

Diff for: .npmignore

@@ -0,0 +1 @@
+lib

Diff for: index.js

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+import * as build from './lib/build'
+import * as query from './lib/query'
+
+export {
+    build,
+    query,
+}

Diff for: lib/build.js

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+/**
+ * Functions to build nodes
+ */
+
+export function applyNode(op, args, loc, options = {}) {
+    return {
+        type: 'Apply',
+        op: op,
+        args: args,
+        loc: loc || {
+            start: args[0].loc.start,
+            end: args[args.length - 1].loc.end,
+        },
+        ...options,
+    }
+}
+
+export function identifierNode(name, start, end) {
+    return {
+        type: 'Identifier',
+        name: name,
+        loc: {start, end},
+        // TODO: add subscript
+    }
+}
+
+export function numberNode(value, start, end) {
+    return {
+        type: 'Number',
+        value: value,
+        loc: {start, end},
+    }
+}
+
+export function parensNode(body, start, end) {
+    return {
+        type: 'Parentheses',
+        loc: {start, end},
+        body: body
+    }
+}

Diff for: lib/query.js

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+/**
+ * Functions to query properties of nodes
+ */
+
+export const isIdentifier = node => node.type === 'Identifier'
+export const isApply = node => node.type === 'Apply'
+
+export const isOperation = node => isApply(node) && !isNumber(node)
+export const isFunction = node => isApply(node) && isIdentifier(node.op)
+
+// TODO: curry it?
+const _isOp = (op, node) => isApply(node) && node.op === op
+
+export const isAdd = node => _isOp('add', node)
+export const isMul = node => _isOp('mul', node)
+export const isPow = node => _isOp('pow', node)
+export const isNeg = node => _isOp('neg', node)
+export const isPos = node => _isOp('pos', node)
+
+export const isNumber = node => {
+    if (node.type === 'Number') {
+        return true
+    } else if (isNeg(node)) {
+        return isNumber(node.args[0])
+    } else {
+        return false
+    }
+}
+
+// check if it's a number before trying to get its value
+export const getValue = node => {
+    if (node.type === 'Number') {
+        return parseFloat(node.value)
+    } else if (isNeg(node)) {
+        return -getValue(node.args[0])
+    } else if (isPos(node)) {
+        return getValue(node.args[0])
+    }
+}

Diff for: package.json

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+{
+  "name": "math-nodes",
+  "version": "0.0.1",
+  "description": "Creation and identification utility functions for nodes in math-ast ASTs",
+  "main": "dist/math-nodes.js",
+  "scripts": {
+    "prepublish": "webpack",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/semantic-math/math-nodes.git"
+  },
+  "author": "Kevin Barabash <[email protected]>",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/semantic-math/math-nodes/issues"
+  },
+  "homepage": "https://github.com/semantic-math/math-nodes#readme",
+  "devDependencies": {
+    "babel-core": "^6.24.1",
+    "babel-loader": "^7.0.0",
+    "babel-preset-es2015": "^6.24.1",
+    "babel-plugin-transform-object-rest-spread": "^6.22.0",
+    "webpack": "^2.4.1"
+  }
+}

Diff for: webpack.config.js

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+const path = require('path');
+
+module.exports = {
+    entry: "./index.js",
+    output: {
+        path: path.join(__dirname, "dist"),
+        filename: "math-nodes.js",
+        libraryTarget: "commonjs2"
+    },
+    module: {
+        loaders: [
+            {
+                test: /\.js$/,
+                exclude: /node_modules/,
+                loader: 'babel-loader',
+            }
+        ]
+    }
+}