feat: add json module for cleaning up json

This is a hack until PR is accepted upstream to Plenary

Author: mehalter

lua/astrocore/json.lua

@@ -0,0 +1,111 @@
+-- based on https://github.com/nvim-lua/plenary.nvim/blob/a3e3bc82a3f95c5ed0d7201546d5d2c19b20d683/lua/plenary/json.lua
+-- remove once PR accepted: https://github.com/nvim-lua/plenary.nvim/pull/613
+
+local singleComment = "singleComment"
+local multiComment = "multiComment"
+local stripWithoutWhitespace = function() return "" end
+
+local function slice(str, from, to)
+  from = from or 1
+  to = to or #str
+  return str:sub(from, to)
+end
+
+local stripWithWhitespace = function(str, from, to) return slice(str, from, to):gsub("%S", " ") end
+
+local isEscaped = function(jsonString, quotePosition)
+  local index = quotePosition - 1
+  local backslashCount = 0
+
+  while jsonString:sub(index, index) == "\\" do
+    index = index - 1
+    backslashCount = backslashCount + 1
+  end
+  return backslashCount % 2 == 1 and true or false
+end
+
+local M = {}
+
+-- Strips any json comments from a json string.
+-- The resulting string can then be used by `vim.fn.json_decode`
+--
+---@param jsonString string
+---@param options table
+---  * whitespace:
+---     - defaults to true
+---     - when true, comments will be replaced by whitespace
+---     - when false, comments will be stripped
+---  * trailing_commas:
+---     - defaults to false
+---     - when true, trailing commas will be included
+---     - when false, trailing commas will be removed
+function M.json_strip_comments(jsonString, options)
+  options = options or {}
+  local strip = options.whitespace == false and stripWithoutWhitespace or stripWithWhitespace
+  local omitTrailingCommas = not options.trailing_commas
+
+  local insideString = false
+  local insideComment = false
+  local offset = 1
+  local result = ""
+  local skip = false
+  local lastComma = 0
+
+  for i = 1, #jsonString, 1 do
+    if skip then
+      skip = false
+    else
+      local currentCharacter = jsonString:sub(i, i)
+      local nextCharacter = jsonString:sub(i + 1, i + 1)
+
+      if not insideComment and currentCharacter == '"' then
+        local escaped = isEscaped(jsonString, i)
+        if not escaped then insideString = not insideString end
+      end
+
+      if not insideString then
+        if not insideComment and currentCharacter .. nextCharacter == "//" then
+          result = result .. slice(jsonString, offset, i - 1)
+          offset = i
+          insideComment = singleComment
+          skip = true
+        elseif insideComment == singleComment and currentCharacter .. nextCharacter == "\r\n" then
+          i = i + 1
+          skip = true
+          insideComment = false
+          result = result .. strip(jsonString, offset, i - 1)
+          offset = i
+        elseif insideComment == singleComment and currentCharacter == "\n" then
+          insideComment = false
+          result = result .. strip(jsonString, offset, i - 1)
+          offset = i
+        elseif not insideComment and currentCharacter .. nextCharacter == "/*" then
+          result = result .. slice(jsonString, offset, i - 1)
+          offset = i
+          insideComment = multiComment
+          skip = true
+        elseif insideComment == multiComment and currentCharacter .. nextCharacter == "*/" then
+          i = i + 1
+          skip = true
+          insideComment = false
+          result = result .. strip(jsonString, offset, i)
+          offset = i + 1
+        elseif omitTrailingCommas and not insideComment then
+          if currentCharacter == "," then
+            lastComma = i
+          elseif (currentCharacter == "]" or currentCharacter == "}") and lastComma > 0 then
+            result = result .. slice(jsonString, offset, lastComma - 1) .. slice(jsonString, lastComma + 1, i)
+            offset = i + 1
+            lastComma = 0
+          elseif currentCharacter:match "%S" then
+            lastComma = 0
+          end
+        end
+      end
+    end
+  end
+
+  return result .. (insideComment and strip(slice(jsonString, offset)) or slice(jsonString, offset))
+end
+
+return M