" Vim syntax file
" Language:	Meson
" License:	VIM License
" Maintainer:	Nirbheek Chauhan <nirbheek.chauhan@gmail.com>
"		Liam Beguin <liambeguin@gmail.com>
" Last Change:	2023 Aug 27
" Credits:	Zvezdan Petkovic <zpetkovic@acm.org>
"		Neil Schemenauer <nas@meson.ca>
"		Dmitry Vasiliev
"
"		This version is copied and edited from python.vim
"		It's very basic, and doesn't do many things I'd like it to
"		For instance, it should show errors for syntax that is valid in
"		Python but not in Meson.
"
" Optional highlighting can be controlled using these variables.
"
"   let meson_space_error_highlight = 1
"

if exists("b:current_syntax")
  finish
endif

" We need nocompatible mode in order to continue lines with backslashes.
" Original setting will be restored.
let s:cpo_save = &cpo
set cpo&vim

" https://mesonbuild.com/Syntax.html
syn keyword mesonConditional	elif else if endif
syn keyword mesonRepeat		foreach endforeach
syn keyword mesonOperator	and not or in
syn keyword mesonStatement	continue break

syn match   mesonComment	"#.*$" contains=mesonTodo,@Spell
syn keyword mesonTodo		FIXME NOTE NOTES TODO XXX contained

" Strings can either be single quoted or triple counted across multiple lines,
" but always with a '
syn region  mesonString
      \ start="\z('\)" end="\z1" skip="\\\\\|\\\z1"
      \ contains=mesonEscape,@Spell
syn region  mesonString
      \ start="\z('''\)" end="\z1" keepend
      \ contains=mesonEscape,mesonSpaceError,@Spell

syn match   mesonEscape	"\\[abfnrtv'\\]" contained
syn match   mesonEscape	"\\\o\{1,3}" contained
syn match   mesonEscape	"\\x\x\{2}" contained
syn match   mesonEscape	"\%(\\u\x\{4}\|\\U\x\{8}\)" contained
" Meson allows case-insensitive Unicode IDs: http://www.unicode.org/charts/
syn match   mesonEscape	"\\N{\a\+\%(\s\a\+\)*}" contained
syn match   mesonEscape	"\\$"

" Meson only supports integer numbers
" https://mesonbuild.com/Syntax.html#numbers
syn match   mesonNumber	"\<\d\+\>"
syn match   mesonNumber	"\<0x\x\+\>"
syn match   mesonNumber	"\<0o\o\+\>"

" booleans
syn keyword mesonBoolean	false true

" Built-in functions
syn keyword mesonBuiltin
  \ build_machine
  \ host_machine
  \ meson
  \ option
  \ target_machine
  \ add_global_arguments
  \ add_global_link_arguments
  \ add_languages
  \ add_project_arguments
  \ add_project_dependencies
  \ add_project_link_arguments
  \ add_test_setup
  \ alias_target
  \ assert
  \ benchmark
  \ both_libraries
  \ build_target
  \ configuration_data
  \ configure_file
  \ custom_target
  \ debug
  \ declare_dependency
  \ dependency
  \ disabler
  \ environment
  \ error
  \ executable
  \ files
  \ find_program
  \ generator
  \ get_option
  \ get_variable
  \ import
  \ include_directories
  \ install_data
  \ install_emptydir
  \ install_headers
  \ install_man
  \ install_subdir
  \ install_symlink
  \ is_disabler
  \ is_variable
  \ jar
  \ join_paths
  \ library
  \ message
  \ project
  \ range
  \ run_command
  \ run_target
  \ set_variable
  \ shared_library
  \ shared_module
  \ static_library
  \ structured_sources
  \ subdir
  \ subdir_done
  \ subproject
  \ summary
  \ test
  \ unset_variable
  \ vcs_tag
  \ warning

if exists("meson_space_error_highlight")
  " trailing whitespace
  syn match   mesonSpaceError	display excludenl "\s\+$"
  " mixed tabs and spaces
  syn match   mesonSpaceError	display " \+\t"
  syn match   mesonSpaceError	display "\t\+ "
endif

" The default highlight links.  Can be overridden later.
hi def link mesonStatement	Statement
hi def link mesonConditional	Conditional
hi def link mesonRepeat		Repeat
hi def link mesonOperator	Operator
hi def link mesonComment	Comment
hi def link mesonTodo		Todo
hi def link mesonString		String
hi def link mesonEscape		Special
hi def link mesonNumber		Number
hi def link mesonBuiltin	Function
hi def link mesonBoolean	Boolean
if exists("meson_space_error_highlight")
  hi def link mesonSpaceError	Error
endif

let b:current_syntax = "meson"

let &cpo = s:cpo_save
unlet s:cpo_save

" vim:set sw=2 sts=2 ts=8 noet: