Prepare json literal inpsection

backend/src/JsonAstParser.ts

@@ -0,0 +1,77 @@
+const parse = require('json-to-ast')
+
+interface JsonPropertyLocation {
+  path: string
+  line: number
+  column: number
+}
+
+type JsonAst = JsonAstLiteral | JsonAstObject | JsonAstArray
+
+interface JsonAstLocation {
+  start: {
+    line: number
+    column: number
+    offset: number
+  }
+  end: {
+    line: number
+    column: number
+    offset: number
+  }
+  source: null | string
+}
+
+interface JsonAstIdentifier {
+  type: 'Identifier'
+  value: string
+  raw: string
+  loc: JsonAstLocation
+}
+
+interface JsonAstObjectProperty {
+  type: 'Property'
+  key: JsonAstIdentifier
+  value: JsonAst
+  loc: JsonAstLocation
+}
+
+interface JsonAstLiteral {
+  type: 'Literal'
+  value: string | number | boolean | any
+  raw: string
+  loc: JsonAstLocation
+}
+
+interface JsonAstObject {
+  type: 'Object'
+  children: Array<JsonAstObjectProperty>
+  loc: JsonAstLocation
+}
+
+interface JsonAstArray {
+  type: 'Array'
+  children: Array<JsonAst>
+  loc: JsonAstLocation
+}
+
+function jsonToPropertyPaths(ast: JsonAst, previousPath: Array<string> = []): Array<JsonPropertyLocation> {
+  let children: Array<Array<JsonPropertyLocation>> = []
+  if (ast.type === 'Literal') {
+    return [{
+      path: previousPath.join('.'),
+      line: ast.loc.start.line,
+      column: ast.loc.start.column,
+    }]
+  } else if (ast.type === 'Array') {
+    children = ast.children.map((value, idx) => jsonToPropertyPaths(value, previousPath.slice().concat([String(idx)])))
+  } else if (ast.type === 'Object') {
+    children = ast.children.map(property => jsonToPropertyPaths(property.value, previousPath.slice().concat([property.key.value])))
+  }
+
+  return children.reduce((a, b) => a.concat(b), [])
+}
+
+export function parseJson(formattedJson: string): Array<JsonPropertyLocation> {
+  return jsonToPropertyPaths((parse(formattedJson) as JsonAst), [])
+}

backend/src/spec/JsonAstParser.spec.ts

@@ -0,0 +1,48 @@
+import 'mocha'
+
+import { expect } from 'chai'
+import { parseJson } from '../JsonAstParser'
+const dotProp = require('dot-prop')
+
+describe('access JSON values via dot property paths', () => {
+  it('object with literal', () => {
+    let data = {
+      foo: 4,
+    }
+
+    let result = parseJson(JSON.stringify(data, undefined, 2))
+    expect(result[0].path).to.eq('foo')
+    expect(result[0].line).to.eq(2)
+  })
+
+  it('nested object', () => {
+    let data = {
+      foo: {
+        bar: 4
+      },
+    }
+
+    let result = parseJson(JSON.stringify(data, undefined, 2))
+    expect(result[0].path).to.eq('foo.bar')
+    expect(result[0].line).to.eq(3)
+    expect(dotProp.get(data, result[0].path)).to.eq(4)
+
+  })
+
+  it('array path', () => {
+    let data = {
+      foo: [
+        1,
+        2,
+        3,
+      ],
+    }
+
+    let result = parseJson(JSON.stringify(data, undefined, 2))
+    expect(result.length).to.eq(3)
+
+    expect(result[2].path).to.eq('foo.2')
+    expect(result[2].line).to.eq(5)
+    expect(dotProp.get(data, result[2].path)).to.eq(3)
+  })
+})