# yaml.lang -- GNU Source-highlight language definition for YAML
# @title YAML
# @matchext yaml
# @matchext yml
#
# Author: Ricardson <r1w1s1@fastmail.com>
# Tested with GNU Source-highlight 3.1.9
#
# Usage:
#   source-highlight -s yaml -f esc    < file.yaml
#   source-highlight -s yaml -f esc256 < file.yaml
#
# Colour mapping (using default.style):
#   keyword  -> keys, document markers, booleans
#   string   -> quoted and block scalar values
#   comment  -> comments
#   number   -> numeric values
#   type     -> anchors (&) and aliases (*)
#   symbol   -> colons, dashes, brackets
#   preproc  -> tags (!tag)

# -----------------------------------------------------------------
# Comments  # comment
# -----------------------------------------------------------------
include "script_comment.lang"

# -----------------------------------------------------------------
# Document markers  ---  ...
# -----------------------------------------------------------------
keyword = '^---[[:blank:]]*$'
keyword = '^[.]{3}[[:blank:]]*$'

# -----------------------------------------------------------------
# Block scalars  |  and  >  (literal and folded)
# -----------------------------------------------------------------
environment string delim '^[[:blank:]]*[^#:]+:[[:blank:]]*[|>][^\n]*' '^[^[:blank:]\n]' begin
  normal = '.'
end

# -----------------------------------------------------------------
# Double-quoted strings
# -----------------------------------------------------------------
environment string delim '"' '"' escape '\\' begin
  normal = '.'
end

# -----------------------------------------------------------------
# Single-quoted strings
# -----------------------------------------------------------------
environment string delim "'" "'" begin
  normal = '.'
end

# -----------------------------------------------------------------
# Anchors  &name  and aliases  *name
# -----------------------------------------------------------------
type = '&[[:alnum:]_-]+'
type = '\*[[:alnum:]_-]+'

# -----------------------------------------------------------------
# Tags  !!str  !!int  !python/object  etc.
# -----------------------------------------------------------------
preproc = '!![[:alnum:]]+'
preproc = '![[:alnum:]/]+'

# -----------------------------------------------------------------
# Booleans and null
# -----------------------------------------------------------------
keyword = '\<true\>|\<false\>|\<yes\>|\<no\>|\<null\>|\<~\>'
keyword = '\<True\>|\<False\>|\<Yes\>|\<No\>|\<Null\>'
keyword = '\<TRUE\>|\<FALSE\>|\<YES\>|\<NO\>|\<NULL\>'

# -----------------------------------------------------------------
# Numbers (int, float, hex, octal, scientific, infinity)
# -----------------------------------------------------------------
include "number.lang"

# -----------------------------------------------------------------
# Keys  (indented or not, followed by colon)
# -----------------------------------------------------------------
(keyword,symbol) = `([[:blank:]]*[[:alnum:]_. -]+)(:(?:[[:blank:]]|$))`

# -----------------------------------------------------------------
# List markers  - item
# -----------------------------------------------------------------
symbol = '^[[:blank:]]*-[[:blank:]]'

# -----------------------------------------------------------------
# Merge key  <<:
# -----------------------------------------------------------------
symbol = '<<:'