%YAML 1.2
---
# http://www.sublimetext.com/docs/3/syntax.html
name: TOML

file_extensions:
  - toml
  - tml
  - Cargo.lock
  - Gopkg.lock
  - Pipfile

scope: source.toml

variables:
  ws: '[ \t]*'
  wsnl: '([ \t\n])*'

  # Used to detect the possible start of a key.
  peek_key_start: '(?=[A-Za-z0-9_''"-])'
  dot_peek_key: '{{ws}}(\.){{ws}}{{peek_key_start}}'

  # integer = [ "-" / "+" ] int
  # int = DIGIT / digit1-9 1*( DIGIT / "_" DIGIT )
  integer: '([\+\-]?) (?: [0-9] | [1-9] (?: [0-9] | _ [0-9] )+ )'

  HEXDIG: '[0-9A-Fa-f]'
  hex_int: '0x{{HEXDIG}}(?:{{HEXDIG}}|_{{HEXDIG}})*'
  oct_int: '0o[0-7](?:[0-7]|_[0-7])*'
  bin_int: '0b[0-1](?:[0-1]|_[0-1])*'

  # zero-prefixable-int = DIGIT *( DIGIT / underscore DIGIT )
  zero_prefixable_int: '[0-9] (?: [0-9] | _ [0-9] )*'
  # frac = decimal-point zero-prefixable-int
  frac: '\. {{zero_prefixable_int}}'
  # exp = "e" float-exp-part
  # float-exp-part = [ minus / plus ] zero-prefixable-int
  exp: '[eE] [\+\-]? {{zero_prefixable_int}}'

  # date-time      = offset-date-time / local-date-time / local-date / local-time
  date_time: '{{offset_date_time}} | {{local_date_time}} | {{local_date}} | {{local_time}}'
  # date-fullyear  = 4DIGIT
  date_fullyear: '[0-9]{4}'
  # date-month     = 2DIGIT  ; 01-12
  date_month: '[0-1][0-9]'
  # date-mday      = 2DIGIT  ; 01-28, 01-29, 01-30, 01-31 based on month/year
  date_mday: '[0-3][0-9]'
  # time-hour      = 2DIGIT  ; 00-23
  time_hour: '[0-2][0-9]'
  # time-minute    = 2DIGIT  ; 00-59
  time_minute: '[0-5][0-9]'
  # time-second    = 2DIGIT  ; 00-58, 00-59, 00-60 based on leap second rules
  time_second: '[0-6][0-9]'
  # time-secfrac   = "." 1*DIGIT
  time_secfrac: '\.[0-9]+'
  # time-numoffset = ( "+" / "-" ) time-hour ":" time-minute
  time_numoffset: '[+-] {{time_hour}} : {{time_minute}}'
  # time-offset    = "Z" / time-numoffset
  time_offset: '(?: [zZ] | {{time_numoffset}} )'
  # partial-time   = time-hour ":" time-minute ":" time-second [time-secfrac]
  partial_time: '{{time_hour}} : {{time_minute}} : {{time_second}} (?: {{time_secfrac}} )?'
  # full-date      = date-fullyear "-" date-month "-" date-mday
  full_date: '{{date_fullyear}} - {{date_month}} - {{date_mday}}'
  # full-time      = partial-time time-offset
  full_time: '{{partial_time}} {{time_offset}}'
  # offset-date-time = full-date T|%20 full-time
  offset_date_time: '{{full_date}} [tT ] {{full_time}}'
  # local-date-time = full-date T|%20 partial-time
  local_date_time: '{{full_date}} [tT ] {{partial_time}}'
  # local-date = full-date
  local_date: '{{full_date}}'
  # local-time = partial-time
  local_time: '{{partial_time}}'

contexts:
  main:
    - match: '^{{ws}}'
      # Ignore leading whitespace for all expressions.
    - include: comments
    - include: tables
    - include: keyval
    - include: illegal

  illegal:
    - match: (.*)
      # Invalid things -> everything unmatched
      captures:
        1: invalid.illegal.toml

  comments:
    - match: '{{ws}}((#).*)'
      captures:
        1: comment.line.number-sign.toml
        2: punctuation.definition.comment.toml

  data-types:
    - include: inline-table
    - include: array
    - include: string
    - include: date-time
    - include: float
    - include: integer
    - include: boolean
    - match: '{{ws}}$'
      # Don't show an incomplete line as invalid to avoid frequent red
      # highlighting while typing.
      pop: true
    - match: '\w+|.'
      scope: invalid.illegal.value.toml
      pop: true

  boolean:
    - match: (true|false)
      captures:
        1: constant.language.toml
      pop: true

  integer:
    - match: |-
        (?x)
          (?<!\w)
            {{hex_int}}
            |{{oct_int}}
            |{{bin_int}}
            |{{integer}}
          (?!\w)
      captures:
        0: constant.numeric.integer.toml
        1: keyword.operator.arithmetic.toml
      pop: true

  float:
    # float = float-int-part ( exp / frac [ exp ] )
    # float =/ special-float
    # special-float = [ minus / plus ] ( inf / nan )
    # float-int-part = dec-int
    - match: |-
        (?x)
          (?<!\w)
            {{integer}}
            (?: {{frac}} | (?: {{frac}} {{exp}} ) | {{exp}} )
          (?!\w)
      captures:
        0: constant.numeric.float.toml
        1: keyword.operator.arithmetic.toml
      pop: true
    - match: '(?<!\w)([+-])?(inf|nan)(?!\w)'
      captures:
        0: constant.numeric.float.toml
        1: keyword.operator.arithmetic.toml
      pop: true

  date-time:
    - match: '(?x) {{date_time}}'
      scope: constant.other.datetime.toml
      pop: true

  string:
    - match: "'''"
      # multi-line literal string (no escape sequences)
      scope: punctuation.definition.string.begin.toml
      set:
        - meta_scope: string.quoted.triple.literal.block.toml
        - match: "'''"
          scope: punctuation.definition.string.end.toml
          pop: true
    - match: '"""'
      # multi-line basic string
      scope: punctuation.definition.string.begin.toml
      set:
        - meta_scope: string.quoted.triple.basic.block.toml
        - match: '"""'
          scope: punctuation.definition.string.end.toml
          pop: true
        - include: string-escape
    - include: basic-string
    - include: literal-string

  basic-string:
    - match: '"'
      scope: punctuation.definition.string.begin.toml
      set:
        - meta_scope: string.quoted.double.basic.toml
        - include: string-escape
        - match: '"'
          scope: punctuation.definition.string.end.toml
          pop: true
        - match: '\n'
          scope: invalid.illegal.string.non-terminated.toml
          pop: true

  string-escape:
    - match: '\\(?:[btnfr"\\]|u\h{4}|U\h{8})'
      scope: constant.character.escape.toml
    - match: '\\.'
      scope: invalid.illegal.string.escape.toml

  literal-string:
    - match: '('')[^'']*('')'
      # There is ambiguity in what is allowed in a literal string.
      # See: https://github.com/toml-lang/toml/issues/473
      scope: string.quoted.single.literal.toml
      captures:
        1: punctuation.definition.string.begin.toml
        2: punctuation.definition.string.end.toml
      pop: true

  array:
    - match: '\['
      scope: punctuation.definition.array.begin.toml
      set: [maybe-empty-array, maybe-array-comments]

  maybe-empty-array:
    - match: ']'
      scope: punctuation.definition.array.end.toml
      pop: true
    - match: ''
      set: [array-sep, data-types]

  array-sep:
    - match: '{{wsnl}}'
    - include: comments
    - match: ']'
      scope: punctuation.definition.array.end.toml
      pop: true
    - match: ','
      scope: punctuation.separator.array.toml
      set:
        - match: '{{wsnl}}'
        - include: comments
        - match: ']'
          scope: punctuation.definition.array.end.toml
          pop: true
        - match: '(?=[^\n])'
          set: [array-sep, data-types]
    - match: '\w+|.'
      scope: invalid.illegal.array.toml

  maybe-array-comments:
    - match: '{{wsnl}}'
    - include: comments
    - match: '(?=[^\n])'
      pop: true

  inline-table:
    - match: '\{'
      scope: punctuation.definition.inline-table.begin.toml
      set:
        - match: '{{ws}}'
        - match: '\}'
          # Empty table.
          scope: punctuation.definition.inline-table.end.toml
          pop: true
        - match: ''
          set: [inline-keyval-sep, key]

  inline-keyval-sep:
    - match: '{{ws}}(=){{ws}}'
      captures:
        1: punctuation.definition.key-value.toml
      set: [inline-table-keyvals, data-types]
    - match: '(?=\w+|.)'
      scope: invalid.illegal.inline-sep.toml
      pop: true

  inline-table-keyvals:
    - match: '{{ws}}'
    - match: '\}'
      scope: punctuation.definition.inline-table.end.toml
      pop: true
    - match: ','
      scope: punctuation.separator.inline-table.toml
      set:
        - match: '{{ws}}'
        - match: ''
          set: [inline-keyval-sep, key]
    - match: '(?=\w+|.)'
      scope: invalid.illegal.inline-key.toml
      pop: true

  keyval:
    - match: '{{peek_key_start}}'
      push: [keyval-sep, key]

  keyval-sep:
    - match: '{{ws}}(=){{ws}}'
      captures:
        # This could arguably be keyword.operator.assignment.toml, but since
        # Monokai uses the same color for non-C sources with entity.name.tag,
        # it doesn't have the appropriate visual distinction.
        1: punctuation.definition.key-value.toml
      set: [maybe-comment-eol, data-types]
    - match: '{{ws}}$'
      # Don't show an incomplete line as invalid to avoid flickering.
      pop: true
    - match: '.+$'
      scope: invalid.illegal.keyval.toml
      pop: true

  key:
    - meta_scope: meta.tag.key.toml
    - match: '{{peek_key_start}}'
      push: [maybe-dot-key, key-simple]
    - match: '(?={{ws}}=)'
      pop: true
    - match: '{{ws}}$'
      # Early exit to avoid errors while typing.
      pop: true
    - match: '.'
      scope: invalid.illegal.key.toml
      pop: true

  key-simple:
    - match: '[A-Za-z0-9_-]+'
      scope: entity.name.tag.toml
      pop: true
    - include: key-quoted
    - match: '\S+'
      scope: invalid.illegal.key.toml
      pop: true

  key-quoted:
    - include: basic-string
    - include: literal-string

  maybe-dot-key:
    - match: '{{dot_peek_key}}'
      captures:
        1: punctuation.separator.key.toml
      push: key-simple
    - match: '(?={{ws}}(?:=|$))'
      pop: true
    - match: '.'
      scope: invalid.illegal.key.toml
      pop: true

  maybe-comment-eol:
    - include: comments
    - match: '$'
      pop: true
    - match: '.+'
      # This also highlights trailing whitespece.  Although that is valid
      # TOML, it doesn't seem bad to me.  If that's annoying, change this
      # to '[^ \n]+'.
      scope: invalid.illegal.trailing.toml
      pop: true

  tables:
    - match: '\[?\[{{ws}}\]\]?'
      scope: invalid.illegal.table.toml

    - match: '(\[\[){{ws}}'
      # Array table.  Same as std-table with double-brackets.
      captures:
        1: punctuation.definition.table.array.begin.toml
      push: [maybe-comment-eol, table-array-name]

    - match: '(\[){{ws}}'
      # std-table = ws "[" ws key (ws "." ws key)* ws "]" ws comment?
      captures:
        1: punctuation.definition.table.begin.toml
      push: [maybe-comment-eol, table-name]

  table-name:
    - meta_content_scope: meta.tag.table.toml
    - match: '{{ws}}(\])'
      captures:
        1: punctuation.definition.table.end.toml
      pop: true
    - include: table-name-inc

  table-array-name:
    - meta_content_scope: meta.tag.table.array.toml
    - match: '{{ws}}(\]\])'
      captures:
        1: punctuation.definition.table.array.end.toml
      pop: true
    - include: table-name-inc

  table-name-inc:
    - match: '{{peek_key_start}}'
      push: [maybe-dot-table-name, table-name-simple]
    - match: '[^\]]+\]?'
      scope: invalid.illegal.table.toml
      pop: true

  table-name-simple:
    - match: '[A-Za-z0-9_-]+'
      scope: entity.name.table.toml
      pop: true
    - include: key-quoted
    - match: '.'
      scope: invalid.illegal.table.toml
      pop: true

  maybe-dot-table-name:
    - match: '{{dot_peek_key}}'
      captures:
        1: punctuation.separator.table.toml
      push: table-name-simple
    - match: '(?={{ws}}(?:\]|$))'
      pop: true
    - match: '.'
      scope: invalid.illegal.table.toml
      pop: true