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-- Copyright 2020-2022 Florian Fischer. See LICENSE.
-- Meson file LPeg lexer.
local lexer = require('lexer')
local token, word_match = lexer.token, lexer.word_match
local P, R, S = lpeg.P, lpeg.R, lpeg.S
local lex = lexer.new('meson', {fold_by_indentation = true})
-- Whitespace.
lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
-- Keywords.
lex:add_rule('keyword', token(lexer.KEYWORD, word_match(
'and or not if elif else endif foreach break continue endforeach')))
-- Methods.
-- https://mesonbuild.com/Reference-manual.html#builtin-objects
-- https://mesonbuild.com/Reference-manual.html#returned-objects
local method_names = word_match{
-- array --
'contains', 'get', 'length',
-- boolean --
'to_int', 'to_string',
-- dictionary --
'has_key', 'get', 'keys',
-- disabler --
'found',
-- integer --
'is_even', 'is_odd',
-- string --
'contains', 'endswith', 'format', 'join', 'split', 'startswith', 'substring', 'strip', 'to_int',
'to_lower', 'to_upper', 'underscorify', 'version_compare',
-- meson object --
'add_dist_script', 'add_install_script', 'add_postconf_script', 'backend', 'build_root',
'source_root', 'project_build_root', 'project_source_root', 'current_build_dir',
'current_source_dir', 'get_compiler', 'get_cross_property', 'get_external_property',
'can_run_host_binaries', 'has_exe_wrapper', 'install_dependency_manifest', 'is_cross_build',
'is_subproject', 'is_unity', 'override_find_program', 'override_dependency', 'project_version',
'project_license', 'project_name', 'version',
-- *_machine object --
'cpu_family', 'cpu', 'system', 'endian',
-- compiler object --
'alignment', 'cmd_array', 'compiles', 'compute_int', 'find_library', 'first_supported_argument',
'first_supported_link_argument', 'get_define', 'get_id', 'get_argument_syntax', 'get_linker_id',
'get_supported_arguments', 'get_supported_link_arguments', 'has_argument', 'has_link_argument',
'has_function', 'check_header', 'has_header', 'has_header_symbol', 'has_member', 'has_members',
'has_multi_arguments', 'has_multi_link_arguments', 'has_type', 'links', 'run',
'symbols_have_underscore_prefix', 'sizeof', 'version', 'has_function_attribute',
'get_supported_function_attributes',
-- build target object --
'extract_all_objects', 'extract_objects', 'full_path', 'private_dir_include', 'name',
-- configuration data object --
'get', 'get_unquoted', 'has', 'keys', 'merge_from', 'set', 'set10', 'set_quoted',
-- custom target object --
'full_path', 'to_list',
-- dependency object --
'found', 'name', 'get_pkgconfig_variable', 'get_configtool_variable', 'type_name', 'version',
'include_type', 'as_system', 'as_link_whole', 'partial_dependency', 'found',
-- external program object --
'found', 'path', 'full_path',
-- environment object --
'append', 'prepend', 'set',
-- external library object --
'found', 'type_name', 'partial_dependency', 'enabled', 'disabled', 'auto',
-- generator object --
'process',
-- subproject object --
'found', 'get_variable',
-- run result object --
'compiled', 'returncode', 'stderr', 'stdout'
}
-- A method call must be followed by an opening parenthesis.
lex:add_rule('method', token('method', method_names * #(lexer.space^0 * '(')))
lex:add_style('method', lexer.styles['function'])
-- Function.
-- https://mesonbuild.com/Reference-manual.html#functions
local func_names = word_match{
'add_global_arguments', 'add_global_link_arguments', 'add_languages', 'add_project_arguments',
'add_project_link_arguments', 'add_test_setup', 'alias_targ', 'assert', 'benchmark',
'both_libraries', 'build_target', 'configuration_data', 'configure_file', 'custom_target',
'declare_dependency', 'dependency', 'disabler', 'error', 'environment', 'executable',
'find_library', 'find_program', 'files', 'generator', 'get_option', 'get_variable', 'import',
'include_directories', 'install_data', 'install_headers', 'install_man', 'install_subdir',
'is_disabler', 'is_variable', 'jar', 'join_paths', 'library', 'message', 'warning', 'summary',
'project', 'run_command', 'run_targ', 'set_variable', 'shared_library', 'shared_module',
'static_library', 'subdir', 'subdir_done', 'subproject', 'test', 'vcs_tag'
}
-- A function call must be followed by an opening parenthesis. The matching of function calls
-- instead of just their names is needed to not falsely highlight function names which can also
-- be keyword arguments. For example 'include_directories' can be a function call itself or a
-- keyword argument of an 'executable' or 'library' function call.
lex:add_rule('function', token(lexer.FUNCTION, func_names * #(lexer.space^0 * '(')))
-- Builtin objects.
-- https://mesonbuild.com/Reference-manual.html#builtin-objects
lex:add_rule('object',
token('object', word_match('meson build_machine host_machine target_machine')))
lex:add_style('object', lexer.styles.type)
-- Constants.
lex:add_rule('constant', token(lexer.CONSTANT, word_match('false true')))
-- Identifiers.
lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
-- Strings.
local str = lexer.range("'", true)
local multiline_str = lexer.range("'''")
lex:add_rule('string', token(lexer.STRING, multiline_str + str))
-- Comments.
lex:add_rule('comment', token(lexer.COMMENT, lexer.to_eol('#', true)))
-- Numbers.
local dec = R('19')^1 * R('09')^0
local bin = '0b' * S('01')^1
local oct = '0o' * R('07')^1
local integer = S('+-')^-1 * (bin + lexer.hex_num + oct + dec)
lex:add_rule('number', token(lexer.NUMBER, integer))
-- Operators.
lex:add_rule('operator', token(lexer.OPERATOR, S('()[]{}-=+/%:.,?<>')))
return lex
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