# avoid cyclic references between `append_json` and `to_json` when none are
# implemented.
protected fun to_json_by_append: String do
- var buffer = new RopeBuffer
+ var buffer = new FlatBuffer
append_json(buffer)
return buffer.to_s
end
redef class Text
super Jsonable
+ # Removes JSON-escaping if necessary in a JSON string
+ #
+ # assert "\\\"string\\uD83D\\uDE02\\\"".unescape_json == "\"string😂\""
+ fun unescape_json: Text do
+ if not json_need_escape then return self
+ return self.json_to_nit_string
+ end
+
+ # Does `self` need treatment from JSON to Nit ?
+ #
+ # i.e. is there at least one `\` character in it ?
+ #
+ # assert not "string".json_need_escape
+ # assert "\\\"string\\\"".json_need_escape
+ protected fun json_need_escape: Bool do return has('\\')
+
redef fun append_json(buffer) do
buffer.add '\"'
for i in [0 .. self.length[ do
buffer.append "\\\\"
else if char == '\"' then
buffer.append "\\\""
- else if char == '\/' then
- buffer.append "\\/"
else if char < ' ' then
if char == '\n' then
buffer.append "\\n"
buffer.append "\\r"
else if char == '\t' then
buffer.append "\\t"
- else if char == 0x0C.code_point then
- buffer.append "\\f"
- else if char == 0x08.code_point then
- buffer.append "\\b"
else
buffer.append char.escape_to_utf16
end
buffer.add '\"'
end
+ # Escapes `self` from a JSON string to a Nit string
+ #
+ # assert "\\\"string\\\"".json_to_nit_string == "\"string\""
+ # assert "\\nEscape\\t\\n".json_to_nit_string == "\nEscape\t\n"
+ # assert "\\u0041zu\\uD800\\uDFD3".json_to_nit_string == "Azu𐏓"
+ protected fun json_to_nit_string: String do
+ var res = new FlatBuffer.with_capacity(bytelen)
+ var i = 0
+ while i < self.length do
+ var char = self[i]
+ if char == '\\' then
+ i += 1
+ char = self[i]
+ if char == 'b' then
+ char = 0x08.code_point
+ else if char == 'f' then
+ char = 0x0C.code_point
+ else if char == 'n' then
+ char = '\n'
+ else if char == 'r' then
+ char = '\r'
+ else if char == 't' then
+ char = '\t'
+ else if char == 'u' then
+ var code = substring(i + 1, 4)
+ var hx = code.to_hex
+ if hx >= 0xD800 and hx <= 0xDFFF then
+ var lostr = substring(i + 7, 4)
+ if lostr.length < 4 then
+ hx = 0xFFFD
+ else
+ hx <<= 16
+ hx += lostr.to_hex
+ hx = hx.from_utf16_surr
+ end
+ i += 6
+ end
+ i += 4
+ char = hx.code_point
+ end
+ # `"`, `/` or `\` => Keep `char` as-is.
+ end
+ res.add char
+ i += 1
+ end
+ return res.to_s
+ end
+
+
# Encode `self` in JSON.
#
# ~~~
# assert "\t\"http://example.com\"\r\n\0\\".to_json ==
- # "\"\\t\\\"http:\\/\\/example.com\\\"\\r\\n\\u0000\\\\\""
+ # "\"\\t\\\"http://example.com\\\"\\r\\n\\u0000\\\\\""
# ~~~
- redef fun to_json do return to_json_by_append
+ redef fun to_json do
+ var b = new FlatBuffer.with_capacity(bytelen)
+ append_json(b)
+ return b.to_s
+ end
# Parse `self` as JSON.
#
end
end
+redef class FlatText
+ redef fun json_need_escape do
+ var its = items
+ for i in [first_byte .. last_byte] do
+ if its[i] == 0x5Cu8 then return true
+ end
+ return false
+ end
+end
+
redef class Buffer
# Append the JSON representation of `jsonable` to `self`.
redef class Nstring
# The represented string.
- private fun to_nit_string: String do
- var res = new Buffer
- var i = 1
- while i < text.length - 1 do
- var char = text[i]
- if char == '\\' then
- i += 1
- char = text[i]
- if char == 'b' then
- char = 0x08.code_point
- else if char == 'f' then
- char = 0x0C.code_point
- else if char == 'n' then
- char = '\n'
- else if char == 'r' then
- char = '\r'
- else if char == 't' then
- char = '\t'
- else if char == 'u' then
- var escape = new Buffer
- escape.append "\\u"
- var code = text.substring(i + 1, 4)
- escape.append code
- var hx = code.to_hex
- if hx >= 0xD800 and hx <= 0xDFFF then
- var lostr = text.substring(i + 7, 4)
- if lostr.length < 4 then
- escape.clear
- escape.append "\\uFFFD"
- else
- escape.append "\\u"
- escape.append lostr
- end
- i += 6
- end
- i += 4
- char = escape.from_utf16_escape
- end
- # `"`, `/` or `\` => Keep `char` as-is.
- end
- res.add char
- i += 1
- end
- return res.to_s
- end
+ private fun to_nit_string: String do return text.substring(1, text.length - 2).unescape_json.to_s
end
redef class Nvalue_object
nitlanguage / nit.git / blobdiff