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