lexers/makefile.lua

   1 -- Copyright 2006-2015 Mitchell mitchell.att.foicica.com. See LICENSE.
   2 -- Makefile LPeg lexer.
   3
   4 local l = require('lexer')
   5 local token, word_match = l.token, l.word_match
   6 local P, R, S = lpeg.P, lpeg.R, lpeg.S
   7
   8 local M = {_NAME = 'makefile'}
   9
  10 -- Whitespace.
  11 local ws = token(l.WHITESPACE, l.space^1)
  12
  13 -- Comments.
  14 local comment = token(l.COMMENT, '#' * l.nonnewline^0)
  15
  16 -- Keywords.
  17 local keyword = token(l.KEYWORD, P('!')^-1 * l.word_match({
  18   -- GNU Make conditionals.
  19   'ifeq', 'ifneq', 'ifdef', 'ifndef', 'else', 'endif',
  20   -- Other conditionals.
  21   'if', 'elseif', 'elseifdef', 'elseifndef',
  22   -- Directives and other keywords.
  23   'define', 'endef', 'export', 'include', 'override', 'private', 'undefine',
  24   'unexport', 'vpath'
  25 }, nil, true))
  26
  27 -- Functions.
  28 local func = token(l.FUNCTION, l.word_match({
  29   -- Functions for String Substitution and Analysis.
  30   'subst', 'patsubst', 'strip', 'findstring', 'filter', 'filter-out', 'sort',
  31   'word', 'wordlist', 'words', 'firstword', 'lastword',
  32   -- Functions for File Names.
  33   'dir', 'notdir', 'suffix', 'basename', 'addsuffix', 'addprefix', 'join',
  34   'wildcard', 'realpath', 'abspath',
  35   -- Functions for Conditionals.
  36   'if', 'or', 'and',
  37   -- Miscellaneous Functions.
  38   'foreach', 'call', 'value', 'eval', 'origin', 'flavor', 'shell',
  39   -- Functions That Control Make.
  40   'error', 'warning', 'info'
  41 }), '-')
  42
  43 -- Variables.
  44 local word_char, assign = l.any - l.space - S(':#=(){}'), S(':+?')^-1 * '='
  45 local expanded_var = '$' * ('(' * word_char^1 * ')' + '{' * word_char^1 * '}')
  46 local auto_var = '$' * S('@%<?^+|*')
  47 local special_var = l.word_match({
  48   'MAKEFILE_LIST', '.DEFAULT_GOAL', 'MAKE_RESTARTS', '.RECIPEPREFIX',
  49   '.VARIABLES', '.FEATURES', '.INCLUDE_DIRS',
  50   'GPATH', 'MAKECMDGOALS', 'MAKESHELL', 'SHELL', 'VPATH'
  51 }, '.') * #(ws^0 * assign)
  52 local implicit_var = l.word_match{
  53   -- Some common variables.
  54   'AR', 'AS', 'CC', 'CXX', 'CPP', 'FC', 'M2C', 'PC', 'CO', 'GET', 'LEX', 'YACC',
  55   'LINT', 'MAKEINFO', 'TEX', 'TEXI2DVI', 'WEAVE', 'CWEAVE', 'TANGLE', 'CTANGLE',
  56   'RM',
  57   -- Some common flag variables.
  58   'ARFLAGS', 'ASFLAGS', 'CFLAGS', 'CXXFLAGS', 'COFLAGS', 'CPPFLAGS', 'FFLAGS',
  59   'GFLAGS', 'LDFLAGS', 'LFLAGS', 'YFLAGS', 'PFLAGS', 'RFLAGS', 'LINTFLAGS',
  60   -- Other.
  61   'DESTDIR', 'MAKE', 'MAKEFLAGS', 'MAKEOVERRIDES', 'MFLAGS'
  62 } * #(ws^0 * assign)
  63 local computed_var = token(l.OPERATOR, '$' * S('({')) * func
  64 local variable = token(l.VARIABLE,
  65                        expanded_var + auto_var + special_var + implicit_var) +
  66                  computed_var
  67
  68 -- Targets.
  69 local special_target = token(l.CONSTANT, l.word_match({
  70   '.PHONY', '.SUFFIXES', '.DEFAULT', '.PRECIOUS', '.INTERMEDIATE', '.SECONDARY',
  71   '.SECONDEXPANSION', '.DELETE_ON_ERROR', '.IGNORE', '.LOW_RESOLUTION_TIME',
  72   '.SILENT', '.EXPORT_ALL_VARIABLES', '.NOTPARALLEL', '.ONESHELL', '.POSIX'
  73 }, '.'))
  74 local normal_target = token('target', (l.any - l.space - S(':#='))^1)
  75 local target = l.starts_line((special_target + normal_target) * ws^0 *
  76                              #(':' * -P('=')))
  77
  78 -- Identifiers.
  79 local identifier = token(l.IDENTIFIER, word_char^1)
  80
  81 -- Operators.
  82 local operator = token(l.OPERATOR, assign + S(':$(){}'))
  83
  84 M._rules = {
  85   {'whitespace', ws},
  86   {'keyword', keyword},
  87   {'target', target},
  88   {'variable', variable},
  89   {'operator', operator},
  90   {'identifier', identifier},
  91   {'comment', comment},
  92 }
  93
  94 M._tokenstyles = {
  95   target = l.STYLE_LABEL
  96 }
  97
  98 M._LEXBYLINE = true
  99
 100 -- Embedded Bash.
 101 local bash = l.load('bash')
 102 bash._RULES['variable'] = token(l.VARIABLE, '$$' * word_char^1) +
 103                           bash._RULES['variable'] + variable
 104 local bash_start_rule = token(l.WHITESPACE, P('\t')) + token(l.OPERATOR, P(';'))
 105 local bash_end_rule = token(l.WHITESPACE, P('\n'))
 106 l.embed_lexer(M, bash, bash_start_rule, bash_end_rule)
 107
 108 return M