-- Copyright 2006-2018 Mitchell mitchell.att.foicica.com. See License.txt.
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-- Makefile LPeg lexer.
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local lexer = require('lexer')
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local token, word_match = lexer.token, lexer.word_match
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local P, R, S = lpeg.P, lpeg.R, lpeg.S
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local lex = lexer.new('makefile', {lex_by_line = true})
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-- Whitespace.
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local ws = token(lexer.WHITESPACE, lexer.space^1)
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lex:add_rule('whitespace', ws)
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-- Keywords.
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lex:add_rule('keyword', token(lexer.KEYWORD, P('!')^-1 * word_match([[
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-- GNU Make conditionals.
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ifeq ifneq ifdef ifndef else endif
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-- Other conditionals.
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if elseif elseifdef elseifndef
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-- Directives and other keywords.
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define endef export include override private undefine unexport vpath
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]], true)))
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-- Targets.
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local special_target = token(lexer.CONSTANT, word_match[[
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.PHONY .SUFFIXES .DEFAULT .PRECIOUS .INTERMEDIATE .SECONDARY .SECONDEXPANSION
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.DELETE_ON_ERROR .IGNORE .LOW_RESOLUTION_TIME .SILENT .EXPORT_ALL_VARIABLES
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.NOTPARALLEL .ONESHELL .POSIX
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]])
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local normal_target = token('target', (lexer.any - lexer.space - S(':#='))^1)
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lex:add_rule('target', lexer.starts_line((special_target + normal_target) *
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ws^0 * #(':' * -P('='))))
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lex:add_style('target', lexer.STYLE_LABEL)
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-- Variables.
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local word_char = lexer.any - lexer.space - S(':#=(){}')
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local assign = S(':+?')^-1 * '='
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local expanded_var = '$' * ('(' * word_char^1 * ')' + '{' * word_char^1 * '}')
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local auto_var = '$' * S('@%<?^+|*')
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local special_var = word_match[[
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MAKEFILE_LIST .DEFAULT_GOAL MAKE_RESTARTS .RECIPEPREFIX .VARIABLES .FEATURES
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.INCLUDE_DIRS GPATH MAKECMDGOALS MAKESHELL SHELL VPATH
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]] * #(ws^0 * assign)
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local implicit_var = word_match[[
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-- Some common variables.
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AR AS CC CXX CPP FC M2C PC CO GET LEX YACC LINT MAKEINFO TEX TEXI2DVI WEAVE
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CWEAVE TANGLE CTANGLE RM
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-- Some common flag variables.
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ARFLAGS ASFLAGS CFLAGS CXXFLAGS COFLAGS CPPFLAGS FFLAGS GFLAGS LDFLAGS LFLAGS
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YFLAGS PFLAGS RFLAGS LINTFLAGS
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-- Other.
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DESTDIR MAKE MAKEFLAGS MAKEOVERRIDES MFLAGS
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]] * #(ws^0 * assign)
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local computed_var = token(lexer.OPERATOR, '$' * S('({')) *
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token(lexer.FUNCTION, word_match[[
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-- Functions for String Substitution and Analysis.
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subst patsubst strip findstring filter filter-out sort word wordlist words
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firstword lastword
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-- Functions for File Names.
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dir notdir suffix basename addsuffix addprefix join wildcard realpath abspath
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-- Functions for Conditionals.
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if or and
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-- Miscellaneous Functions.
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foreach call value eval origin flavor shell
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-- Functions That Control Make.
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error warning info
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]])
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local variable = token(lexer.VARIABLE, expanded_var + auto_var + special_var +
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implicit_var) + computed_var
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lex:add_rule('variable', variable)
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-- Operators.
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lex:add_rule('operator', token(lexer.OPERATOR, assign + S(':$(){}')))
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-- Identifiers.
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lex:add_rule('identifier', token(lexer.IDENTIFIER, word_char^1))
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-- Comments.
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lex:add_rule('comment', token(lexer.COMMENT, '#' * lexer.nonnewline^0))
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-- Embedded Bash.
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local bash = lexer.load('bash')
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bash:modify_rule('variable', token(lexer.VARIABLE, '$$' * word_char^1) +
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bash:get_rule('variable') + variable)
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local bash_start_rule = token(lexer.WHITESPACE, P('\t')) +
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token(lexer.OPERATOR, P(';'))
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local bash_end_rule = token(lexer.WHITESPACE, P('\n'))
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lex:embed(bash, bash_start_rule, bash_end_rule)
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return lex
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