jsony.pgx

%grammar jsony
%version 0.0.1

jsony:
  | seq
  | map
  | top_seq
  | top_map
  | list

node:
  | map
  | seq
  | scalar

map:
  /- '{' -/
  pair*
  /- '}' -/

pair:
  string
  /- ':'? -/
  node
  /- ','? -/

seq:
  /- LSQUARE -/
  node* %% /- ','? -/
  /- RSQUARE -/

top_seq: top_seq_entry+

top_seq_entry:
  /- '-' SPACE+ /
  (
    node* %% / (: SPACE* ',' SPACE* EOL - | SPACE+ ) /
    ( comment | EOL )
  )

top_map:
    (string /- ':' -/ node -)+

list: node* %% /- ','? -/

scalar:
  | double
  | single
  | bare

string: scalar

# Interpretation of http://www.json.org/
double: /
  DOUBLE
    (
      (:
        BACK (:     # Backslash escapes
          [
            DOUBLE  # Double Quote
            BACK    # Back Slash
            SLASH   # Foreward Slash
            'b'     # Back Space
            'f'     # Form Feed
            'n'     # New Line
            'r'     # Carriage Return
            't'     # Horizontal Tab
          ]
        |
          'u' HEX{4}  # Unicode octet pair
        )
      |
        [^ DOUBLE CONTROLS ]  # Anything else
      )*
    )
  DOUBLE
/

# TODO: Support '' as escape for single quote
single: /
  SINGLE
  ([^ SINGLE ]*)
  SINGLE
/

bare: /( [^ excludes ]* [^ excludes COLON ] )/

excludes: /
  WS
  LCURLY RCURLY
  LSQUARE RSQUARE
  SINGLE DOUBLE
  COMMA
/

ws: /(: WS | comment )/

comment: /(:
  HASH SPACE ANY* EOL |
  HASH EOL |
  SPACE* EOL
)/

# vim: sw=2: