Overview

Miso.JSON.Lexer is the first stage of miso's pure Haskell JSON pipeline, which is used for server-side rendering (SSR). It tokenises a MisoString into a stream of Token values consumed by Miso.JSON.Parser.

This module is internal. Application code should use Miso.JSON or Miso.JSON.Parser (decodePure) instead.

This module was ported from https://github.com/dmjio/json-test by @ners.

Token types

data Token
  = TokenPunctuator Char    -- one of [ ] { } , :
  | TokenNumber     Double  -- JSON number (integer or floating-point)
  | TokenBool       Bool    -- true or false
  | TokenString     MisoString -- quoted string with escape sequences
  | TokenNull               -- null

String tokens handle all RFC 8259 escape sequences including \uXXXX and UTF-16 surrogate pairs (\uD800\uDC00).

See also

• Miso.JSON.Parser — consumes Token streams produced here
• Miso.JSON.Types — Value produced by the parser
• Miso.Util.Lexer — the underlying Lexer combinator library