Add support for dot-prop syntax to resolve #23

defaultMethods.js

@@ -8,6 +8,7 @@ import { build, buildString } from './compiler.js'
 import chainingSupported from './utilities/chainingSupported.js'
 import InvalidControlInput from './errors/InvalidControlInput.js'
 import YieldingIterators from './yieldingIterators.js'
+import { splitPath } from './utilities/splitPath.js'
 
 function isDeterministic (method, engine, buildState) {
   if (Array.isArray(method)) {
@@ -161,7 +162,8 @@ const defaultMethods = {
   get: {
     method: ([data, key, defaultValue], context, above, engine) => {
       const notFound = defaultValue === undefined ? null : defaultValue
-      const subProps = String(key).split('.')
+
+      const subProps = splitPath(String(key))
       for (let i = 0; i < subProps.length; i++) {
         if (data === null || data === undefined) {
           return notFound
@@ -203,7 +205,7 @@ const defaultMethods = {
       }
       return null
     }
-    const subProps = String(key).split('.')
+    const subProps = splitPath(String(key))
     for (let i = 0; i < subProps.length; i++) {
       if (context === null || context === undefined) {
         return notFound
@@ -810,7 +812,7 @@ defaultMethods.get.compile = function (data, buildState) {
     if (key && typeof key === 'object') return false
 
     key = key.toString()
-    const pieces = key.split('.')
+    const pieces = splitPath(key)
     if (!chainingSupported) {
       return `(((a,b) => (typeof a === 'undefined' || a === null) ? b : a)(${pieces.reduce(
         (text, i) => {
@@ -854,7 +856,7 @@ defaultMethods.var.compile = function (data, buildState) {
       buildState.useContext = true
       return false
     }
-    const pieces = key.split('.')
+    const pieces = splitPath(key)
     const [top] = pieces
     buildState.varTop.add(top)
     // support older versions of node

general.test.js

@@ -117,4 +117,21 @@ describe('Various Test Cases', () => {
   it('get operator w/ object key as var', async () => {
     for (const engine of [...normalEngines, ...permissiveEngines]) await testEngine(engine, { get: [{ var: 'selected' }, { var: 'key' }] }, { selected: { b: 2 }, key: 'b' }, 2)
   })
+
+  it('is able to handle simple path escaping', async () => {
+    for (const engine of [...normalEngines, ...permissiveEngines]) await testEngine(engine, { get: [{ var: 'selected' }, 'b\\.c'] }, { selected: { 'b.c': 2 } }, 2)
+  })
+
+  it('is able to handle simple path escaping in a variable', async () => {
+    for (const engine of [...normalEngines, ...permissiveEngines]) await testEngine(engine, { get: [{ var: 'selected' }, { var: 'key' }] }, { selected: { 'b.c': 2 }, key: 'b\\.c' }, 2)
+  })
+
+  it('is able to handle path escaping in a var call', async () => {
+    for (const engine of [...normalEngines, ...permissiveEngines]) await testEngine(engine, { var: 'hello\\.world' }, { 'hello.world': 2 }, 2)
+  })
+
+  it('is able to handle path escaping with multiple escapes', async () => {
+    for (const engine of [...normalEngines, ...permissiveEngines]) await testEngine(engine, { var: '\\foo' }, { '\\foo': 2 }, 2)
+    for (const engine of [...normalEngines, ...permissiveEngines]) await testEngine(engine, { var: '\\\\foo' }, { '\\foo': 2 }, 2)
+  })
 })

index.js

@@ -9,7 +9,9 @@ import EngineObject from './structures/EngineObject.js'
 import Constants from './constants.js'
 import defaultMethods from './defaultMethods.js'
 import { asLogicSync, asLogicAsync } from './asLogic.js'
+import { splitPath } from './utilities/splitPath.js'
 
+export { splitPath }
 export { LogicEngine }
 export { AsyncLogicEngine }
 export { Compiler }
@@ -20,4 +22,4 @@ export { defaultMethods }
 export { asLogicSync }
 export { asLogicAsync }
 
-export default { LogicEngine, AsyncLogicEngine, Compiler, YieldStructure, EngineObject, Constants, defaultMethods, asLogicSync, asLogicAsync }
+export default { LogicEngine, AsyncLogicEngine, Compiler, YieldStructure, EngineObject, Constants, defaultMethods, asLogicSync, asLogicAsync, splitPath }

package.json

@@ -1,6 +1,6 @@
 {
   "name": "json-logic-engine",
-  "version": "1.2.11",
+  "version": "1.3.0",
   "description": "Construct complex rules with JSON & process them.",
   "main": "./dist/cjs/index.js",
   "module": "./dist/esm/index.js",

utilities/splitPath.js

@@ -0,0 +1,39 @@
+
+/**
+ * Splits a path string into an array of parts.
+ *
+ * @example splitPath('a.b.c') // ['a', 'b', 'c']
+ * @example splitPath('a\\.b.c') // ['a.b', 'c']
+ * @example splitPath('a\\\\.b.c') // ['a\\', 'b', 'c']
+ * @example splitPath('a\\\\\\.b.c') // ['a\\.b', 'c']
+ * @example splitPath('hello') // ['hello']
+ * @example splitPath('hello\\') // ['hello\\']
+ * @example splitPath('hello\\\\') // ['hello\\']
+ *
+ * @param {string} str
+ * @param {string} separator
+ * @returns {string[]}
+ */
+export function splitPath (str, separator = '.', escape = '\\') {
+  const parts = []
+  let current = ''
+
+  for (let i = 0; i < str.length; i++) {
+    const char = str[i]
+    if (char === escape) {
+      if (str[i + 1] === separator) {
+        current += separator
+        i++
+      } else if (str[i + 1] === escape) {
+        current += escape
+        i++
+      } else current += escape
+    } else if (char === separator) {
+      parts.push(current)
+      current = ''
+    } else current += char
+  }
+  parts.push(current)
+
+  return parts
+}