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Diffstat (limited to 'lua/lexers/perl.lua')
| -rw-r--r-- | lua/lexers/perl.lua | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/lua/lexers/perl.lua b/lua/lexers/perl.lua new file mode 100644 index 0000000..f77893e --- /dev/null +++ b/lua/lexers/perl.lua @@ -0,0 +1,161 @@ +-- Copyright 2006-2016 Mitchell mitchell.att.foicica.com. See LICENSE. +-- Perl LPeg lexer. + +local l = require('lexer') +local token, word_match = l.token, l.word_match +local P, R, S, V = lpeg.P, lpeg.R, lpeg.S, lpeg.V + +local M = {_NAME = 'perl'} + +-- Whitespace. +local ws = token(l.WHITESPACE, l.space^1) + +-- Comments. +local line_comment = '#' * l.nonnewline_esc^0 +local block_comment = l.starts_line('=') * l.alpha * + (l.any - l.newline * '=cut')^0 * (l.newline * '=cut')^-1 +local comment = token(l.COMMENT, block_comment + line_comment) + +local delimiter_matches = {['('] = ')', ['['] = ']', ['{'] = '}', ['<'] = '>'} +local literal_delimitted = P(function(input, index) -- for single delimiter sets + local delimiter = input:sub(index, index) + if not delimiter:find('%w') then -- only non alpha-numerics + local match_pos, patt + if delimiter_matches[delimiter] then + -- Handle nested delimiter/matches in strings. + local s, e = delimiter, delimiter_matches[delimiter] + patt = l.delimited_range(s..e, false, false, true) + else + patt = l.delimited_range(delimiter) + end + match_pos = lpeg.match(patt, input, index) + return match_pos or #input + 1 + end +end) +local literal_delimitted2 = P(function(input, index) -- for 2 delimiter sets + local delimiter = input:sub(index, index) + -- Only consider non-alpha-numerics and non-spaces as delimiters. The + -- non-spaces are used to ignore operators like "-s". + if not delimiter:find('[%w ]') then + local match_pos, patt + if delimiter_matches[delimiter] then + -- Handle nested delimiter/matches in strings. + local s, e = delimiter, delimiter_matches[delimiter] + patt = l.delimited_range(s..e, false, false, true) + else + patt = l.delimited_range(delimiter) + end + first_match_pos = lpeg.match(patt, input, index) + final_match_pos = lpeg.match(patt, input, first_match_pos - 1) + if not final_match_pos then -- using (), [], {}, or <> notation + final_match_pos = lpeg.match(l.space^0 * patt, input, first_match_pos) + end + return final_match_pos or #input + 1 + end +end) + +-- Strings. +local sq_str = l.delimited_range("'") +local dq_str = l.delimited_range('"') +local cmd_str = l.delimited_range('`') +local heredoc = '<<' * P(function(input, index) + local s, e, delimiter = input:find('([%a_][%w_]*)[\n\r\f;]+', index) + if s == index and delimiter then + local end_heredoc = '[\n\r\f]+' + local _, e = input:find(end_heredoc..delimiter, e) + return e and e + 1 or #input + 1 + end +end) +local lit_str = 'q' * P('q')^-1 * literal_delimitted +local lit_array = 'qw' * literal_delimitted +local lit_cmd = 'qx' * literal_delimitted +local lit_tr = (P('tr') + 'y') * literal_delimitted2 * S('cds')^0 +local regex_str = #P('/') * l.last_char_includes('-<>+*!~\\=%&|^?:;([{') * + l.delimited_range('/', true) * S('imosx')^0 +local lit_regex = 'qr' * literal_delimitted * S('imosx')^0 +local lit_match = 'm' * literal_delimitted * S('cgimosx')^0 +local lit_sub = 's' * literal_delimitted2 * S('ecgimosx')^0 +local string = token(l.STRING, sq_str + dq_str + cmd_str + heredoc + lit_str + + lit_array + lit_cmd + lit_tr) + + token(l.REGEX, regex_str + lit_regex + lit_match + lit_sub) + +-- Numbers. +local number = token(l.NUMBER, l.float + l.integer) + +-- Keywords. +local keyword = token(l.KEYWORD, word_match{ + 'STDIN', 'STDOUT', 'STDERR', 'BEGIN', 'END', 'CHECK', 'INIT', + 'require', 'use', + 'break', 'continue', 'do', 'each', 'else', 'elsif', 'foreach', 'for', 'if', + 'last', 'local', 'my', 'next', 'our', 'package', 'return', 'sub', 'unless', + 'until', 'while', '__FILE__', '__LINE__', '__PACKAGE__', + 'and', 'or', 'not', 'eq', 'ne', 'lt', 'gt', 'le', 'ge' +}) + +-- Functions. +local func = token(l.FUNCTION, word_match({ + 'abs', 'accept', 'alarm', 'atan2', 'bind', 'binmode', 'bless', 'caller', + 'chdir', 'chmod', 'chomp', 'chop', 'chown', 'chr', 'chroot', 'closedir', + 'close', 'connect', 'cos', 'crypt', 'dbmclose', 'dbmopen', 'defined', + 'delete', 'die', 'dump', 'each', 'endgrent', 'endhostent', 'endnetent', + 'endprotoent', 'endpwent', 'endservent', 'eof', 'eval', 'exec', 'exists', + 'exit', 'exp', 'fcntl', 'fileno', 'flock', 'fork', 'format', 'formline', + 'getc', 'getgrent', 'getgrgid', 'getgrnam', 'gethostbyaddr', 'gethostbyname', + 'gethostent', 'getlogin', 'getnetbyaddr', 'getnetbyname', 'getnetent', + 'getpeername', 'getpgrp', 'getppid', 'getpriority', 'getprotobyname', + 'getprotobynumber', 'getprotoent', 'getpwent', 'getpwnam', 'getpwuid', + 'getservbyname', 'getservbyport', 'getservent', 'getsockname', 'getsockopt', + 'glob', 'gmtime', 'goto', 'grep', 'hex', 'import', 'index', 'int', 'ioctl', + 'join', 'keys', 'kill', 'lcfirst', 'lc', 'length', 'link', 'listen', + 'localtime', 'log', 'lstat', 'map', 'mkdir', 'msgctl', 'msgget', 'msgrcv', + 'msgsnd', 'new', 'oct', 'opendir', 'open', 'ord', 'pack', 'pipe', 'pop', + 'pos', 'printf', 'print', 'prototype', 'push', 'quotemeta', 'rand', 'readdir', + 'read', 'readlink', 'recv', 'redo', 'ref', 'rename', 'reset', 'reverse', + 'rewinddir', 'rindex', 'rmdir', 'scalar', 'seekdir', 'seek', 'select', + 'semctl', 'semget', 'semop', 'send', 'setgrent', 'sethostent', 'setnetent', + 'setpgrp', 'setpriority', 'setprotoent', 'setpwent', 'setservent', + 'setsockopt', 'shift', 'shmctl', 'shmget', 'shmread', 'shmwrite', 'shutdown', + 'sin', 'sleep', 'socket', 'socketpair', 'sort', 'splice', 'split', 'sprintf', + 'sqrt', 'srand', 'stat', 'study', 'substr', 'symlink', 'syscall', 'sysread', + 'sysseek', 'system', 'syswrite', 'telldir', 'tell', 'tied', 'tie', 'time', + 'times', 'truncate', 'ucfirst', 'uc', 'umask', 'undef', 'unlink', 'unpack', + 'unshift', 'untie', 'utime', 'values', 'vec', 'wait', 'waitpid', 'wantarray', + 'warn', 'write' +}, '2')) + +-- Identifiers. +local identifier = token(l.IDENTIFIER, l.word) + +-- Variables. +local special_var = '$' * ('^' * S('ADEFHILMOPSTWX')^-1 + + S('\\"[]\'&`+*.,;=%~?@<>(|/!-') + + ':' * (l.any - ':') + P('$') * -l.word + l.digit^1) +local plain_var = ('$#' + S('$@%')) * P('$')^0 * l.word + '$#' +local variable = token(l.VARIABLE, special_var + plain_var) + +-- Operators. +local operator = token(l.OPERATOR, S('-<>+*!~\\=/%&|^.?:;()[]{}')) + +-- Markers. +local marker = token(l.COMMENT, word_match{'__DATA__', '__END__'} * l.any^0) + +M._rules = { + {'whitespace', ws}, + {'keyword', keyword}, + {'marker', marker}, + {'function', func}, + {'string', string}, + {'identifier', identifier}, + {'comment', comment}, + {'number', number}, + {'variable', variable}, + {'operator', operator}, +} + +M._foldsymbols = { + _patterns = {'[%[%]{}]', '#'}, + [l.OPERATOR] = {['['] = 1, [']'] = -1, ['{'] = 1, ['}'] = -1}, + [l.COMMENT] = {['#'] = l.fold_line_comments('#')} +} + +return M |