PEM.sublime-syntax

%YAML 1.2
---
# Not strictly just PEM. Includes some other stuff, just to be helpful.

# https://www.sublimetext.com/docs/syntax.html
# https://datatracker.ietf.org/doc/html/rfc7468 (PEM)
# https://datatracker.ietf.org/doc/html/rfc4716 (OpenSSH)
# https://datatracker.ietf.org/doc/html/rfc4880 (OpenPGP)

name: Private Encrypted Mail (PEM) Key
scope: source.pem
version: 2
extends: SSH Common.sublime-syntax

file_extensions:
  - pem

hidden_file_extensions:
  - cer
  - cert
  - crt
  - id_dsa
  - id_ed25519
  - id_ed448
  - id_eddsa
  - id_rsa

first_line_match: |-
        ^(?x:
          (-{4}[ -])
          BEGIN [ ]
          ( (?:[0-9A-Z -]+[ ])? (?: PUBLIC | PRIVATE ) [ ] KEY
          | (?:[0-9A-Z -]+[ ])? CERTIFICATE (?:[ ] REQUEST )?
          | (?:[0-9A-Z -]+[ ])? PARAMETERS
          | X509 [ ] CRL
          | PKCS7
          | PKCS [ ] \#7 [ ] SIGNED [ ] DATA
          | CMS
          | PGP [ ] MESSAGE (?:,[ ] PART [ ] \d+(?:/\d+)?)?
          | PGP [ ] (?: PUBLIC | PRIVATE ) [ ] KEY [ ] BLOCK
          | PGP [ ] SIGNATURE
          )
          ([ -]-{4})
        )

contexts:
  main:
    - include: comments-number-sign
    - match: |-
        ^(?x:
          (-{4}[ -])
          BEGIN [ ]
          ( (?:[0-9A-Z -]+[ ])? (?: PUBLIC | PRIVATE ) [ ] KEY
          | (?:[0-9A-Z -]+[ ])? CERTIFICATE (?:[ ] REQUEST )?
          | (?:[0-9A-Z -]+[ ])? PARAMETERS
          | X509 [ ] CRL
          | PKCS7
          | PKCS [ ] \#7 [ ] SIGNED [ ] DATA
          | CMS
          | PGP [ ] MESSAGE (?:,[ ] PART [ ] \d+(?:/\d+)?)?
          | PGP [ ] (?: PUBLIC | PRIVATE ) [ ] KEY [ ] BLOCK
          | PGP [ ] SIGNATURE
          )
          ([ -]-{4})
        )
      scope: punctuation.section.block.begin.pem
      push: pem-key
    - include: setext-headings

  pem-key:
    - meta_scope: meta.block.pem
    - match: ^\1END \2\3
      scope: punctuation.section.block.end.pem
      pop: 1
    - include: comments-number-sign
    - match: ^{{base64_char}}{1,100}(={0,3})?$
      scope: string.unquoted.pem
      captures:
        1: punctuation.definition.string.end.pem
    - include: headers

  headers:
    - match: ^(?i:(Comment))(:)
      captures:
        1: keyword.other.comment.pem
        2: punctuation.separator.key-value.pem
      push:
        - meta_content_scope: comment.line.pem
        - include: header-end
    - match: ^((x-)?[\w-]+)(:)
      captures:
        1: meta.mapping.key.pem keyword.other.pem
        2: variable.annotation.pem
        3: punctuation.separator.key-value.pem
      push: header-value

  header-value:
    - meta_scope: meta.mapping.pem
    - meta_content_scope: meta.mapping.value.pem
    - include: header-end
    - include: punctuation-comma-sequence
    - match: =
      scope: punctuation.separator.key-value.pem
    - match: '\b(?x: ENCRYPTED | MIC-ONLY | MIC-CLEAR )\b'
      scope: storage.modifier.pem
    - match: |-
        \b(?x:
          ( AES-(?:128|256)-CBC
          | DES-(?:EDE3-)?CBC
          )\b
          ( (,) .+ )?
        )
      captures:
        1: meta.function-call.identifier.pem
           support.function.cipher.ssh.crypto
        2: meta.function-call.arguments.pem
        3: punctuation.section.arguments.begin.pem

  header-end:
    - match: \\\r?\n
      scope: punctuation.separator.continuation.line.pem
      push:
        - match: ^
          pop: 1
    - match: (?=$)
      pop: 1

  setext-headings:
    - match: ^(?:=+|(?=\S))
      branch_point: maybe-heading
      branch:
        - setext-heading
        - not-heading

  setext-heading:
    - meta_scope: markup.heading.pem
    - meta_content_scope: entity.name.section.pem
    - match: ^(={5,})[ \t]*$(\n?)
      captures:
        1: punctuation.definition.heading.setext.pem
        2: meta.whitespace.newline.pem
      pop: 1
    - match: ^(?!=+)$
      fail: maybe-heading

  not-heading:
    - match: ''
      pop: 1