Terraform.sublime-syntax

%YAML 1.2
#
# This syntax definition is based on the Terraform guide:
# https://www.terraform.io/docs/language/index.html
#
# As well as the HCL Native Syntax Spec:
# https://github.com/hashicorp/hcl/blob/main/hclsyntax/spec.md
# (previously https://github.com/hashicorp/hcl2/blob/master/hcl/hclsyntax/spec.md)
#
# For documentation on the .subline-syntax format:
# https://www.sublimetext.com/docs/syntax.html
#
# Regex's in this file support the Oniguruma regex engine:
# https://raw.githubusercontent.com/kkos/oniguruma/5.9.6/doc/RE
#
---
name: Terraform
scope: source.terraform
version: 2

# File Extensions:
#
# - ".tf": the standard file extension
#   https://www.terraform.io/docs/language/index.html
file_extensions:
  - tf
  - nomad

variables:
  # Identifiers: ID_Start (ID_Continue | '-')*;
  #
  # There is an undocumented exception
  # that an underscore character is also accepted
  # as an id start character.
  #
  # https://github.com/hashicorp/hcl/blob/main/hclsyntax/spec.md#identifiers
  # http://unicode.org/reports/tr31/#Table_Lexical_Classes_for_Identifiers
  ID_Start: '[\p{ID_Start}_]'
  ID_Continue: '[\p{ID_Continue}-]'
  identifier: (?:{{ID_Start}}{{ID_Continue}}*)

  # Exponent: "e" or "E" followed by an optional sign
  #
  # https://github.com/hashicorp/hcl2/blob/master/hcl/hclsyntax/spec.md#numeric-literals
  exponent: ([Ee][+-]?)

  # Character Escapes:
  #
  #   - \n: newline
  #   - \r: carriage return
  #   - \t: tab
  #   - \": quote
  #   - \\: backslash
  #   - \uNNNN: unicode char (NNNN is 4 hex digits)
  #   - \uNNNNNNNN: unicode char (NNNNNNNN us 8 digits)
  #
  # https://github.com/hashicorp/hcl2/blob/master/hcl/hclsyntax/spec.md#template-expressions
  char_escapes: \\[nrt"\\]|\\u(\h{8}|\h{4})

  # String literals (basically static and single-line strings)
  # for usage in look-aheads.
  #
  # https://github.com/hashicorp/hcl/blob/main/hclsyntax/spec.md#template-expressions
  string_literal: '"(?:[^"]|{{char_escapes}})*"'

  # A block label
  #
  # https://github.com/hashicorp/hcl/blob/main/hclsyntax/spec.md#structural-elements
  label: (?:{{identifier}}|{{string_literal}})

  # Terraform Named Values
  #
  # https://www.terraform.io/docs/language/expressions/references.html
  named_values: (?:var|local|module|data|path|terraform|each|count|self)

  # Block types that are known to Terraform.
  #
  # data: https://developer.hashicorp.com/terraform/language/data-sources
  # ephemeral: https://developer.hashicorp.com/terraform/language/resources/ephemeral
  # resource: https://developer.hashicorp.com/terraform/language/resources/syntax
  terraform_typed_and_named_blocks: (?:data|ephemeral|resource)
  # module: https://developer.hashicorp.com/terraform/language/modules/syntax
  # output: https://developer.hashicorp.com/terraform/language/values/outputs
  # provider: https://developer.hashicorp.com/terraform/language/providers/configuration
  # variable: https://developer.hashicorp.com/terraform/language/values/variables
  terraform_named_blocks: (?:module|output|provider|variable)
  # locals: https://developer.hashicorp.com/terraform/language/values/locals
  # terraform: https://developer.hashicorp.com/terraform/language/terraform#terraform-block-syntax
  # (Currently unused because they do not have special behavior implemented.)
  terraform_other_blocks: (?:locals|terraform)

  # Terraform built-in type keywords
  #
  # https://www.terraform.io/docs/language/expressions/type-constraints.html#primitive-types
  # https://www.terraform.io/docs/language/expressions/type-constraints.html#dynamic-types-the-quot-any-quot-constraint
  terraform_type_keywords: (?:any|string|number|bool)

  # Built-In Functions
  #
  # https://developer.hashicorp.com/terraform/language/functions
  builtin_functions: |-
    (?x:
    # numbers
      abs | ceil | floor | log | max | min | parseint | pow | signum
    # string
    | chomp | endswith | format | formatlist | indent | join | lower | regex
    | regexall | replace | split | startswith | strcontains | strrev | substr
    | templatestring | title | trim | trimprefix | trimsuffix | trimspace | upper
    # collection
    | alltrue | anytrue | chunklist | coalesce | coalescelist | compact | concat
    | contains | distinct | element | flatten | index | keys | length | list
    | lookup | map | matchkeys | merge | one | range | reverse | setintersection
    | setproduct | setsubtract | setunion | slice | sort | sum | transpose
    | values | zipmap
    # encoding
    | base64decode | base64encode | base64gzip | csvdecode | jsondecode
    | jsonencode | textdecodebase64 | textencodebase64 | urlencode | yamldecode
    | yamlencode
    # filesystem
    | abspath | dirname | pathexpand | basename | file | fileexists | fileset
    | filebase64 | templatefile
    # date and time
    | formatdate | plantimestamp | timeadd | timecmp | timestamp
    # hash and crypto
    | base64sha256 | base64sha512 | bcrypt | filebase64sha256
    | filebase64sha512 | filemd5 | filesha1 | filesha256 | filesha512 | md5
    | rsadecrypt | sha1 | sha256 | sha512 | uuid | uuidv5
    # ip network
    | cidrhost | cidrnetmask | cidrsubnet | cidrsubnets
    # type conversion
    | can | issensitive | nonsensitive | sensitive | tobool | tolist | tomap
    | tonumber | toset | tostring | try | type
    # terraform-specific
    | provider::terraform::(?:encode_tfvars | decode_tfvars | encode_expr)
    # deprecated/old
    | filemd1
    )

contexts:
  main:
    - include: comments
    - include: attribute-definition
    - include: imports
    - include: blocks
    - include: expressions

  comments:
    - include: inline-comments
    - include: block-comments

  # Expressions:
  #
  # https://github.com/hashicorp/hcl2/blob/master/hcl/hclsyntax/spec.md#expression-terms
  expressions:
    - include: literals
    - include: operators
    - include: brackets
    - include: objects
    - include: attribute-access
    - include: functions
    - include: parens
    - include: identifiers
    - include: illegal-strays

  comma:
    - match: \,
      comment: Commas - used in certain expressions
      scope: punctuation.separator.terraform

  parens:
    - match: \(
      scope: punctuation.section.parens.begin.terraform
      comment: Parens - matched *after* function syntax
      push: paren-body

  paren-body:
    - meta_scope: meta.parens.terraform
    - match: \)
      scope: punctuation.section.parens.end.terraform
      pop: 1
    - include: expressions

  # Literal Values: Numbers, Language Constants, and Strings
  #
  #   Strings are _technically_ part of the "expression sub-language",
  #   but make the most sense to be part of this stack.
  #
  # https://github.com/hashicorp/hcl2/blob/master/hcl/hclsyntax/spec.md#literal-values
  literals:
    - include: numeric-literals
    - include: language-constants
    - include: string-literals
    - include: heredoc
    - include: type-keywords
    - include: named-value-references

  named-value-references:
    - match: \b{{named_values}}\b
      comment: Special variables available only to Terraform.
      scope: variable.language.terraform

  type-keywords:
    - match: \b{{terraform_type_keywords}}\b
      comment: Type keywords known to Terraform.
      scope: storage.type.terraform

  # Inline Comments: begin at the operator, end at the end of the line.
  #
  # https://www.terraform.io/docs/language/syntax/configuration.html#comments
  # https://github.com/hashicorp/hcl2/blob/master/hcl/hclsyntax/spec.md#comments-and-whitespace
  inline-comments:
    - match: '#|//'
      comment: Inline Comments
      scope: punctuation.definition.comment.terraform
      push: inline-comment-body

  inline-comment-body:
    - meta_scope: comment.line.terraform
    - match: $\n?
      scope: punctuation.definition.comment.terraform
      pop: 1

  # Block comments: start and end delimiters for multi-line comments.
  #
  # https://www.terraform.io/docs/language/syntax/configuration.html#comments
  # https://github.com/hashicorp/hcl2/blob/master/hcl/hclsyntax/spec.md#comments-and-whitespace
  block-comments:
    - match: /\*
      comment: Block comments
      scope: punctuation.definition.comment.terraform
      push: block-comments-body

  block-comments-body:
    - meta_scope: comment.block.terraform
    - match: \*/
      scope: punctuation.definition.comment.terraform
      pop: 1

  # Language Constants: booleans and `null`.
  #
  # https://www.terraform.io/docs/language/expressions/types.html#literal-expressions
  # https://github.com/hashicorp/hcl2/blob/master/hcl/hclsyntax/spec.md#literal-values
  language-constants:
    - match: \btrue\b
      scope: constant.language.boolean.true.terraform
    - match: \bfalse\b
      scope: constant.language.boolean.false.terraform
    - match: \bnull\b
      scope: constant.language.null.terraform

  # Numbers: Integers, fractions and exponents
  #
  # https://www.terraform.io/docs/language/expressions/types.html
  # https://github.com/hashicorp/hcl2/blob/master/hcl/hclsyntax/spec.md#numeric-literals
  numeric-literals:
    - match: \b\d+{{exponent}}\d+\b
      comment: Integer, no fraction, optional exponent
      scope: meta.number.float.decimal.terraform constant.numeric.value.terraform
    - match: \b\d+(\.)\d+(?:{{exponent}}\d+)?\b
      comment: Integer, fraction, optional exponent
      scope: meta.number.float.decimal.terraform constant.numeric.value.terraform
      captures:
        1: punctuation.separator.decimal.terraform
    - match: \b\d+\b
      comment: Integers
      scope: meta.number.integer.decimal.terraform constant.numeric.value.terraform

  # Strings:
  #
  # https://www.terraform.io/docs/language/expressions/types.html
  # https://github.com/hashicorp/hcl2/blob/master/hcl/hclsyntax/spec.md#template-expressions
  string-literals:
    - match: \"
      comment: Strings
      scope: punctuation.definition.string.begin.terraform
      push: string-body

  string-body:
    - meta_scope: meta.string.terraform string.quoted.double.terraform
    - match: \"
      scope: punctuation.definition.string.end.terraform
      pop: 1
    - match: \n
      scope: invalid.illegal.unclosed-string.terraform
      pop: 1
    - include: character-escapes
    - include: string-interpolation
    - include: aws-acl

  character-escapes:
    - match: '{{char_escapes}}'
      comment: Character Escapes
      scope: constant.character.escape.terraform

  aws-acl:
    - match: (?=\barn:aws:)
      push: aws-acl-body

  aws-acl-body:
    - clear_scopes: 1  # Clear the string.* scope.
    - meta_scope: variable.language.acl.terraform
    - match: ([$%]\{)(~)?
      captures:
        1: punctuation.section.interpolation.begin.terraform
        2: keyword.operator.template.trim.left.terraform
      push: acl-interpolation-body
    - match: :|/
      scope: punctuation.separator.sequence.terraform
    - match: \*
      scope: constant.other.wildcard.asterisk.terraform
    - match: (?![\w-])
      pop: 1

  acl-interpolation-body:
    - meta_scope: meta.interpolation.terraform
    - meta_content_scope: source.terraform
    - include: string-interpolation-body

  # String Interpolation: ("${" | "${~") Expression ("}" | "~}"
  #
  # https://github.com/hashicorp/hcl2/blob/master/hcl/hclsyntax/spec.md#templates
  string-interpolation:
    - match: ([$%]\{)(~)?
      captures:
        1: punctuation.section.interpolation.begin.terraform
        2: keyword.operator.template.trim.left.terraform
      push: string-interpolation-body

  string-interpolation-body:
    - clear_scopes: 1  # Clear the string.* scope.
    - meta_scope: meta.interpolation.terraform
    - meta_content_scope: source.terraform
    - match: (~)?(\})
      captures:
        1: keyword.operator.template.trim.right.terraform
        2: punctuation.section.interpolation.end.terraform
      pop: 1
    - match: \bif\b
      scope: keyword.control.conditional.if.terraform
    - match: \belse\b
      scope: keyword.control.conditional.else.terraform
    - match: \bendif\b
      scope: keyword.control.conditional.end.terraform
    - match: \bfor\b
      scope: keyword.control.loop.for.terraform
    - match: \bendfor\b
      scope: keyword.control.loop.end.terraform
    - match: \bin\b
      scope: keyword.control.loop.in.terraform
    - include: expressions

  # String Heredocs
  #
  # https://github.com/hashicorp/hcl2/blob/master/hcl/hclsyntax/spec.md#template-expressions
  heredoc:
    - match: (\<\<\-?)\s*({{identifier}})\s*$
      comment: String Heredoc's
      captures:
        1: keyword.operator.heredoc.terraform
        2: keyword.control.heredoc.terraform
      push: heredoc-body

  heredoc-body:
    - meta_content_scope: meta.string.terraform string.unquoted.heredoc.terraform
    - match: ^\s*\2\s*$
      comment: The heredoc token identifier (second capture above).
      scope: keyword.control.heredoc.terraform
      pop: 1
    - include: string-interpolation

  # Operators:
  #
  # https://github.com/hashicorp/hcl2/blob/master/hcl/hclsyntax/spec.md#operators-and-delimiters
  # https://github.com/hashicorp/hcl2/blob/master/hcl/hclsyntax/spec.md#operations
  operators:
    - match: \>\=   # >=
      scope: keyword.operator.comparison.terraform
    - match: \<\=   # <=
      scope: keyword.operator.comparison.terraform
    - match: \=\=   # ==
      scope: keyword.operator.comparison.terraform
    - match: \!\=   # !=
      scope: keyword.operator.comparison.terraform
    - match: \+     # +
      scope: keyword.operator.arithmetic.terraform
    - match: \-     # -
      scope: keyword.operator.arithmetic.terraform
    - match: \*     # *
      scope: keyword.operator.arithmetic.terraform
    - match: \/     # /
      scope: keyword.operator.arithmetic.terraform
    - match: \%     # %
      scope: keyword.operator.arithmetic.terraform
    - match: \&\&   # &&
      scope: keyword.operator.logical.terraform
    - match: \|\|   # ||
      scope: keyword.operator.logical.terraform
    - match: \!     # !
      scope: keyword.operator.logical.terraform
    - match: \>     # >
      scope: keyword.operator.comparison.terraform
    - match: \<     # <
      scope: keyword.operator.comparison.terraform
    - match: \?     # ?
      scope: keyword.operator.ternary.terraform
    - match: \.\.\. # ...
      scope: keyword.operator.terraform
    - match: ':'  # :
      scope: keyword.operator.ternary.terraform

  # Terraform "import" statements
  #
  # https://www.terraform.io/docs/cli/import/usage.html
  imports:
    - match: \b(terraform)\s+(import)\b
      comment: Importing resources
      captures:
        1: support.constant.terraform
        2: keyword.control.import.terraform
      push: import-body

  import-body:
    - match: \"
      comment: String literal label
      scope: punctuation.definition.string.begin.terraform
      push: literal-label-body
    - match: '{{identifier}}'
      comment: Identifier label
      scope: entity.name.label.terraform
    - include: numeric-literals
    - include: attribute-access
    - match: $\n?
      comment: Pop at newline
      pop: 1

  literal-label-body:
    - meta_scope: meta.string.terraform string.quoted.double.terraform
    - match: \"
      scope: punctuation.definition.string.end.terraform
      pop: 1

  # Brackets: matches tuples and subscript notation
  #
  # https://github.com/hashicorp/hcl2/blob/master/hcl/hclsyntax/spec.md#index-operator
  brackets:
    - match: \[
      scope: punctuation.section.brackets.begin.terraform
      push: bracket-body

  bracket-body:
    - meta_scope: meta.brackets.terraform
    - match: (\*)?\]
      comment: Full-splat operator
      scope: punctuation.section.brackets.end.terraform
      captures:
        1: keyword.operator.splat.terraform
      pop: 1
    - include: comma
    - include: comments
    - include: tuple-for-expression
    - include: expressions

  # Objects: collection values
  #
  #   Allows keys as identifiers, strings, and computed values wrapped in parens.
  #
  # https://github.com/hashicorp/hcl2/blob/master/hcl/hclsyntax/spec.md#collection-values
  objects:
    - match: \{
      scope: punctuation.section.braces.begin.terraform
      push: object-body

  object-body:
    - meta_scope: meta.braces.terraform
    - match: \}
      scope: punctuation.section.braces.end.terraform
      pop: 1
    - include: object-for-expression
    - include: comments
    - match: (?=({{identifier}}|\".*?\")\s*=)
      push:
        - object-value
        - assignment-operator
        - object-literal-key
    - match: \(
      comment: Computed object key (any expression between parens)
      scope: punctuation.section.parens.begin.terraform
      push:
        - object-value
        - assignment-operator
        - object-computed-key
    - include: Packages/Terraform/JSON (Terraform).sublime-syntax#object-body

  object-computed-key:
    - meta_scope: meta.mapping.key.terraform meta.parens.terraform
    - include: paren-body

  object-literal-key:
    - match: '{{identifier}}'
      scope: meta.mapping.key.terraform meta.string.terraform string.unquoted.terraform
      pop: 1
    - match: (\").*?(\")
      scope: meta.mapping.key.terraform meta.string.terraform string.quoted.double.terraform
      captures:
        1: punctuation.definition.string.begin.terraform
        2: punctuation.definition.string.end.terraform
      pop: 1
    - include: else-pop

  assignment-operator:
    - match: =
      scope: keyword.operator.assignment.terraform
      pop: 1
    - include: else-pop

  # Object key values: pop at comma, newline, and closing-bracket
  #
  # https://github.com/hashicorp/hcl2/blob/master/hcl/hclsyntax/spec.md#collection-values
  object-value:
    - include: comments
    - match: \,
      comment: Pop scope on comma.
      scope: punctuation.separator.terraform
      pop: 1
    - match: $\n?
      comment: Pop scope on EOL.
      pop: 1
    - match: (?=\})
      comment: Lookahead (don't consume) and pop scope on a bracket.
      scope: punctuation.section.braces.end.terraform
      pop: 1
    - include: expressions

  # Attribute Access: "." Identifier
  #
  # https://github.com/hashicorp/hcl2/blob/master/hcl/hclsyntax/spec.md#attribute-access-operator
  attribute-access:
    - match: \.
      scope: punctuation.accessor.dot.terraform
      push: member

  member:
    - include: comments
    - match: '{{identifier}}'
      comment: Attribute access
      scope: variable.other.member.terraform
      pop: 1
    - match: \d+
      comment: Subscript
      scope: meta.number.integer.decimal.terraform constant.numeric.value.terraform
      pop: 1
    - match: \*
      comment: Attribute-only splat
      scope: keyword.operator.splat.terraform
      pop: 1
    - include: else-pop

  # Attribute Definition: Identifier "=" Expression Newline
  #
  # The "=" operator cannot be immediately followed by "="
  # ">", as those are other operators, not attr definitions.
  #
  # https://github.com/hashicorp/hcl2/blob/master/hcl/hclsyntax/spec.md#attribute-definitions
  attribute-definition:
    - match: (?=(\()?({{identifier}})(\))?\s*(\=(?![\=\>])))
      push:
        - assignment-operator
        - attribute-key

  attribute-key:
    - match: \((?={{identifier}}\))
      scope: punctuation.section.parens.begin.terraform
      set:
        - attribute-key-end
        - attribute-key
    # https://developer.hashicorp.com/terraform/language/meta-arguments/for_each
    - match: for_each\b
      scope: variable.declaration.terraform keyword.control.loop.for.terraform
      pop: 1
    # https://developer.hashicorp.com/terraform/language/meta-arguments/count
    - match: count\b
      scope: variable.declaration.terraform keyword.control.conditional.terraform
      pop: 1
    - match: '{{identifier}}'
      scope: variable.declaration.terraform variable.other.readwrite.terraform
      pop: 1

  attribute-key-end:
    - meta_scope: meta.parens.terraform
    - match: \)
      scope: punctuation.section.parens.end.terraform
      pop: 1

  # Functions: Terraform builtins and unknown
  #
  # https://github.com/hashicorp/hcl2/blob/master/hcl/hclsyntax/spec.md#functions-and-function-calls
  # https://www.terraform.io/docs/language/expressions/function-calls.html
  functions:
    - match: (?={{builtin_functions}}\()
      push: builtin-function-name
    - match: (?=(?:{{identifier}}::)*{{identifier}}\()
      push: other-function-name

  builtin-function-name:
    - meta_content_scope: meta.function-call.identifier.terraform
    - include: function-argument-list
    - include: namespaces
    - match: '{{identifier}}'
      scope: support.function.builtin.terraform

  other-function-name:
    - meta_content_scope: meta.function-call.identifier.terraform
    - include: function-argument-list
    - include: namespaces
    - match: '{{identifier}}'
      scope: variable.function.terraform

  function-argument-list:
    - match: \(
      scope: punctuation.section.parens.begin.terraform
      set: function-argument-list-body

  function-argument-list-body:
    - meta_scope: meta.function-call.arguments.terraform meta.parens.terraform
    - match: \)
      scope: punctuation.section.parens.end.terraform
      pop: 1
    - include: comments
    - include: expressions
    - include: comma

  # Tuple for-Expression:
  #
  # "[" "for" Identifier ("," Identifier)? "in" Expression ":" Expression ("if" Expression)? "]";
  #
  # https://github.com/hashicorp/hcl2/blob/master/hcl/hclsyntax/spec.md#for-expressions
  # https://www.terraform.io/docs/language/expressions/for.html
  tuple-for-expression:
    - match: \bfor\b
      comment: for expression (arrays)
      scope: keyword.control.loop.for.terraform
      set: tuple-for-expression-body

  tuple-for-expression-body:
    - meta_content_scope: meta.brackets.terraform
    - match: \]
      scope: meta.brackets.terraform punctuation.section.brackets.end.terraform
      pop: 1
    - include: for-expression-body

  # Object for-Expression:
  #
  # "{" "for" Identifier ("," Identifier)? "in" Expression ":" Expression "=>" Expression "..."? ("if" Expression)? "}";
  #
  # https://github.com/hashicorp/hcl2/blob/master/hcl/hclsyntax/spec.md#for-expressions
  # https://www.terraform.io/docs/language/expressions/for.html
  object-for-expression:
    - match: \bfor\b
      comment: for expression (arrays)
      scope: keyword.control.loop.for.terraform
      set: object-for-expression-body

  object-for-expression-body:
    - meta_content_scope: meta.braces.terraform
    - match: \}
      scope: meta.braces.terraform punctuation.section.braces.end.terraform
      pop: 1
    - match: \=\>
      scope: punctuation.separator.key-value.terraform
    - include: for-expression-body

  # Shared body syntax for tuple and object for-expressions.
  # They require different `set` blocks because they are
  # pop'd with different characters and objects allow `=>`.
  for-expression-body:
    - match: \bin\b
      scope: keyword.operator.iteration.in.terraform
    - match: \bif\b
      scope: keyword.control.conditional.terraform
    - match: '\:'
      scope: punctuation.section.block.loop.for.terraform
    - include: expressions
    - include: comments
    - include: comma

  namespaces:
    - match: ({{identifier}})(::)
      captures:
        1: variable.namespace.terraform
        2: punctuation.accessor.double-colon.terraform

  identifiers:
    - match: '{{identifier}}'
      scope: variable.other.readwrite.terraform

  illegal-strays:
    - match: '[\])}]'
      scope: invalid.illegal.stray.terraform

  # Blocks: Identifier (StringLit|Identifier)* "{" Newline Body "}" Newline;
  #
  # https://github.com/hashicorp/hcl2/blob/master/hcl/hclsyntax/spec.md#structural-elements
  blocks:
    - include: typed-and-named-blocks
    - include: named-blocks
    - include: generic-blocks

  typed-and-named-blocks:
    # Special case for two-label resources,
    # where the first denotes the type and the second the name.
    - match: (?=\b{{terraform_typed_and_named_blocks}}(\s+{{label}}){2}\s*\{)
      push:
        - body
        - block-name-label
        - block-type-label
        - block-declaration

  named-blocks:
    # Special case for two-label resources,
    # where the first denotes the type and the second the name.
    - match: (?=\b{{terraform_named_blocks}}\s+{{label}}\s*\{)
      push:
        - body
        - block-name-label
        - block-declaration

  generic-blocks:
    - match: (?=\b({{identifier}})(\s+{{label}})*\s*\{)
      push:
        - body
        - generic-block-labels
        - block-declaration

  block-declaration:
    - match: '{{identifier}}'
      scope: keyword.declaration.terraform
      pop: 1
    - include: else-pop

  block-type-label:
    - match: \"
      scope: punctuation.definition.string.begin.terraform
      set: block-type-label-body
    - match: '{{identifier}}'
      scope: support.type.terraform
      pop: 1
    - include: else-pop

  block-type-label-body:
    - meta_scope: meta.string.terraform
    - meta_content_scope: support.type.terraform
    - match: \"
      scope: punctuation.definition.string.end.terraform
      pop: 1
    - include: character-escapes

  block-name-label:
    - match: \"
      scope: punctuation.definition.string.begin.terraform
      set: block-name-label-body
    - match: '{{identifier}}'
      scope: entity.name.label.terraform
      pop: 1
    - include: else-pop

  block-name-label-body:
    - meta_scope: meta.string.terraform
    - meta_content_scope: entity.name.label.terraform
    - match: \"
      scope: punctuation.definition.string.end.terraform
      pop: 1
    - include: character-escapes

  generic-block-labels:
    # Labels probably have a meaning, but we don't know which,
    # so we just scope them as (un-)quoted strings.
    - match: \"
      scope: punctuation.definition.string.begin.terraform
      push: generic-block-label-body
    - match: '{{identifier}}'
      scope: string.unquoted.double.terraform
    - include: else-pop

  generic-block-label-body:
    - meta_scope: meta.string.terraform string.quoted.double.terraform
    - match: \"
      scope: punctuation.definition.string.end.terraform
      pop: 1
    - include: character-escapes

  body:
    - meta_content_scope: meta.block.head.terraform
    - match: \{
      scope: punctuation.section.block.begin.terraform
      set: body-body
    - include: else-pop

  body-body:
    - meta_scope: meta.block.body.terraform
    - match: \}
      scope: punctuation.section.block.end.terraform
      pop: 1
    - include: main

  else-pop:
    - match: (?=\S)
      pop: 1