Added optional Lua lexer support.

This support is disabled by default and must be enabled via compile-time option.

1 files changed, 72 insertions, 0 deletions

diff --git a/lexlua/fortran.lua b/lexlua/fortran.lua
new file mode 100644
index 000000000..98f2e7b38
--- /dev/null
+++ b/lexlua/fortran.lua
@@ -0,0 +1,72 @@
+-- Copyright 2006-2018 Mitchell mitchell.att.foicica.com. See License.txt.
+-- Fortran 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('fortran')
+
+-- Whitespace.
+lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
+
+-- Comments.
+local c_comment = lexer.starts_line(S('Cc')) * lexer.nonnewline^0
+local d_comment = lexer.starts_line(S('Dd')) * lexer.nonnewline^0
+local ex_comment = lexer.starts_line('!') * lexer.nonnewline^0
+local ast_comment = lexer.starts_line('*') * lexer.nonnewline^0
+local line_comment = '!' * lexer.nonnewline^0
+lex:add_rule('comment', token(lexer.COMMENT, c_comment + d_comment +
+                                             ex_comment + ast_comment +
+                                             line_comment))
+
+-- Keywords.
+lex:add_rule('keyword', token(lexer.KEYWORD, word_match([[
+  include program module subroutine function contains use call return
+  -- Statements.
+  case select default continue cycle do while else if elseif then elsewhere end
+  endif enddo forall where exit goto pause stop
+  -- Operators.
+  .not. .and. .or. .xor. .eqv. .neqv. .eq. .ne. .gt. .ge. .lt. .le.
+  -- Logical.
+  .false. .true.
+]], true)))
+
+-- Functions.
+lex:add_rule('function', token(lexer.FUNCTION, word_match([[
+  -- I/O.
+  backspace close endfile inquire open print read rewind write format
+  -- Type conversion utility and math.
+  aimag aint amax0 amin0 anint ceiling cmplx conjg dble dcmplx dfloat dim dprod
+  float floor ifix imag int logical modulo nint real sign sngl transfer zext abs
+  acos aimag aint alog alog10 amax0 amax1 amin0 amin1 amod anint asin atan atan2
+  cabs ccos char clog cmplx conjg cos cosh csin csqrt dabs dacos dasin datan
+  datan2 dble dcos dcosh ddim dexp dim dint dlog dlog10 dmax1 dmin1 dmod dnint
+  dprod dreal dsign dsin dsinh dsqrt dtan dtanh exp float iabs ichar idim idint
+  idnint ifix index int isign len lge lgt lle llt log log10 max max0 max1 min
+  min0 min1 mod nint real sign sin sinh sngl sqrt tan tanh
+]], true)))
+
+-- Types.
+lex:add_rule('type', token(lexer.TYPE, word_match([[
+  implicit explicit none data parameter allocate allocatable allocated
+  deallocate integer real double precision complex logical character dimension
+  kind
+]], true)))
+
+-- Numbers.
+lex:add_rule('number', token(lexer.NUMBER, (lexer.float + lexer.integer) *
+                                           -lexer.alpha))
+
+-- Identifiers.
+lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.alnum^1))
+
+-- Strings.
+local sq_str = lexer.delimited_range("'", true, true)
+local dq_str = lexer.delimited_range('"', true, true)
+lex:add_rule('string', token(lexer.STRING, sq_str + dq_str))
+
+-- Operators.
+lex:add_rule('operator', token(lexer.OPERATOR, S('<>=&+-/*,()')))
+
+return lex