support mapping string values

README.md

@@ -4,7 +4,7 @@
 
 ### \[('compress' || 'uncompress') + ('State' || 'Selection' || 'Step') + 'JSON']()
 
-Renames the keys. Maintains JSON structure.
+Renames known keys and values. Maintains JSON structure.
 
 ```js
 let compressedStateJSON = compressStateJSON(/*editorState*/.toJSON())
@@ -20,11 +20,11 @@ let steps = compressedStepsJSON.map(json => Step.fromJSON(/*schema*/, uncompress
 #### uncompressed vs compressed
 
 ```json
-{"selection":{"head":764,"anchor":764}},"doc":{"type":"doc","content":[{"type":"heading","attrs":
+{"selection":{"head":0,"anchor":0}},"doc":{"type":"doc","content":[{"type":"heading","attrs":{"level":3},
 ```
 
 ```json
-{"s":{"h":764,"a":764}},"d":{"t":"doc","c":[{"t":"heading","a":
+{"s":{"h":0,"a":0}},"d":{"t":"d","c":[{"t":"h","a":{"l":3},
 ```
 
 ### compressStepsLossy()

src/functions.js

@@ -25,6 +25,9 @@ function invertKeysMap(keysMap) {
 
 function mapKeys(keysMap, obj) {
   return (
+    typeof obj === 'string' ?
+      (keysMap[obj] || [ obj ])[0]
+    :
     Array.isArray(obj) ?
       obj.map(mapKeys.bind(0, keysMap))
     :

src/index.js

@@ -1,4 +1,4 @@
-import { stateKeysMap, selectionKeysMap, stepKeysMap } from './keysMaps'
+import { stateKeysMap, selectionKeysMap, stepKeysMap } from './maps'
 import { keysMappers } from './functions'
 
 export const [ compressStateJSON, uncompressStateJSON ] = keysMappers(stateKeysMap)

src/maps.js

@@ -0,0 +1,83 @@
+const markTypeValuesMap = {
+  em: ['e'],
+  strong: ['s'],
+  link: ['l'],
+  code: ['c'],
+}
+
+const markAttrsKeysMap = {
+  href: ['h'], // link
+  title: ['t'], // link
+}
+
+const markKeysMap = {
+  type: ['t', markTypeValuesMap],
+  attrs: ['a', markAttrsKeysMap],
+}
+
+const contentTypeValuesMap = {
+  doc: ['d'],
+  paragraph: ['p'],
+  blockquote: ['b'],
+  horizontal_rule: ['h_r'],
+  heading: ['h'],
+  code_block: ['c_b'],
+  text: ['t'],
+  image: ['i'],
+  hard_break: ['h_b'],
+  ordered_list: ['o_l'],
+  bullet_list: ['b_l'],
+  list_item: ['l_i'],
+  table: ['ta'],
+  table_row: ['t_r'],
+  table_cell: ['t_c'],
+}
+
+const contentAttrsKeysMap = {
+  level: ['l'], // heading
+  src: ['s'], // image
+  alt: ['a'], // image
+  title: ['t'], // image
+  order: ['o'], // ordered_list
+  columns: ['c'], // table, table_row
+}
+
+const contentKeysMap = {
+  type: ['t', contentTypeValuesMap],
+  text: ['te'],
+  attrs: ['a', contentAttrsKeysMap],
+  level: ['l'],
+  marks: ['m', markKeysMap],
+}
+contentKeysMap.content = ['c', contentKeysMap]
+
+const sliceKeysMap = {
+  content: ['c', contentKeysMap],
+  openLeft: ['oL'],
+  openRight: ['oR'],
+}
+
+export const stepKeysMap = {
+  stepType: ['sT'],
+  from: ['f'],
+  to: ['t'],
+  structure: ['st'],
+  insert: ['i'],
+  gapFrom: ['gF'],
+  gapTo: ['gT'],
+  slice: ['s', sliceKeysMap],
+  mark: ['m', markKeysMap],
+}
+
+export const selectionKeysMap = {
+  head: ['h'],
+  anchor: ['a'],
+  node: ['n'],
+  after: ['af'],
+}
+
+export const stateKeysMap = {
+  doc: ['d', contentKeysMap],
+  selection: ['s', selectionKeysMap],
+  storedMarks: ['sM', markKeysMap],
+}