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-- Copyright 2006-2022 Mitchell. See LICENSE.
-- Makefile LPeg lexer.
local lexer = require('lexer')
local token, word_match = lexer.token, lexer.word_match
local P, S = lpeg.P, lpeg.S
local lex = lexer.new('makefile', {lex_by_line = true})
-- Whitespace.
local ws = token(lexer.WHITESPACE, lexer.space^1)
lex:add_rule('whitespace', ws)
-- Keywords.
lex:add_rule('keyword', token(lexer.KEYWORD, P('!')^-1 * word_match({
-- GNU Make conditionals.
'ifeq', 'ifneq', 'ifdef', 'ifndef', 'else', 'endif',
-- Other conditionals.
'if', 'elseif', 'elseifdef', 'elseifndef',
-- Directives and other keywords.
'define', 'endef', 'export', 'include', 'override', 'private', 'undefine', 'unexport', 'vpath'
}, true)))
-- Targets.
local special_target = token(lexer.CONSTANT, word_match{
'.PHONY', '.SUFFIXES', '.DEFAULT', '.PRECIOUS', '.INTERMEDIATE', '.SECONDARY', '.SECONDEXPANSION',
'.DELETE_ON_ERROR', '.IGNORE', '.LOW_RESOLUTION_TIME', '.SILENT', '.EXPORT_ALL_VARIABLES',
'.NOTPARALLEL', '.ONESHELL', '.POSIX'
})
local normal_target = token('target', (lexer.any - lexer.space - S(':#='))^1)
local target_list = normal_target * (ws * normal_target)^0
lex:add_rule('target', lexer.starts_line((special_target + target_list) * ws^0 * #(':' * -P('='))))
lex:add_style('target', lexer.styles.label)
-- Variables.
local word_char = lexer.any - lexer.space - S(':#=(){}')
local assign = S(':+?')^-1 * '='
local expanded_var = '$' * ('(' * word_char^1 * ')' + '{' * word_char^1 * '}')
local auto_var = '$' * S('@%<?^+|*')
local special_var = word_match{
'MAKEFILE_LIST', '.DEFAULT_GOAL', 'MAKE_RESTARTS', '.RECIPEPREFIX', '.VARIABLES', '.FEATURES',
'.INCLUDE_DIRS', 'GPATH', 'MAKECMDGOALS', 'MAKESHELL', 'SHELL', 'VPATH'
} * #(ws^0 * assign)
local implicit_var = word_match{
-- Some common variables.
'AR', 'AS', 'CC', 'CXX', 'CPP', 'FC', 'M2C', 'PC', 'CO', 'GET', 'LEX', 'YACC', 'LINT', 'MAKEINFO',
'TEX', 'TEXI2DVI', 'WEAVE', 'CWEAVE', 'TANGLE', 'CTANGLE', 'RM',
-- Some common flag variables.
'ARFLAGS', 'ASFLAGS', 'CFLAGS', 'CXXFLAGS', 'COFLAGS', 'CPPFLAGS', 'FFLAGS', 'GFLAGS', 'LDFLAGS',
'LDLIBS', 'LFLAGS', 'YFLAGS', 'PFLAGS', 'RFLAGS', 'LINTFLAGS',
-- Other.
'DESTDIR', 'MAKE', 'MAKEFLAGS', 'MAKEOVERRIDES', 'MFLAGS'
} * #(ws^0 * assign)
local variable = token(lexer.VARIABLE, expanded_var + auto_var + special_var + implicit_var)
local computed_var = token(lexer.OPERATOR, '$' * S('({')) * token(lexer.FUNCTION, word_match{
-- Functions for String Substitution and Analysis.
'subst', 'patsubst', 'strip', 'findstring', 'filter', 'filter-out', 'sort', 'word', 'wordlist',
'words', 'firstword', 'lastword',
-- Functions for File Names.
'dir', 'notdir', 'suffix', 'basename', 'addsuffix', 'addprefix', 'join', 'wildcard', 'realpath',
'abspath',
-- Functions for Conditionals.
'if', 'or', 'and',
-- Miscellaneous Functions.
'foreach', 'call', 'value', 'eval', 'origin', 'flavor', 'shell',
-- Functions That Control Make.
'error', 'warning', 'info'
})
lex:add_rule('variable', variable + computed_var)
-- Operators.
lex:add_rule('operator', token(lexer.OPERATOR, assign + S(':$(){}')))
-- Identifiers.
lex:add_rule('identifier', token(lexer.IDENTIFIER, word_char^1))
-- Comments.
lex:add_rule('comment', token(lexer.COMMENT, lexer.to_eol('#')))
-- Embedded Bash.
local bash = lexer.load('bash')
bash:modify_rule('variable',
token(lexer.VARIABLE, '$$' * word_char^1) + bash:get_rule('variable') + variable)
local bash_start_rule = token(lexer.WHITESPACE, '\t') + token(lexer.OPERATOR, ';')
local bash_end_rule = token(lexer.WHITESPACE, '\n')
lex:embed(bash, bash_start_rule, bash_end_rule)
return lex
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