76 lines
2.6 KiB
Lua
76 lines
2.6 KiB
Lua
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-- Copyright 2006-2019 Mitchell mitchell.att.foicica.com. See License.txt.
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-- PHP 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, V = lpeg.P, lpeg.R, lpeg.S, lpeg.V
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local lex = lexer.new('php')
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-- Whitespace.
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lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
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-- Keywords.
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lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[
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and array as bool boolean break case cfunction class const continue declare
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default die directory do double echo else elseif empty enddeclare endfor
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endforeach endif endswitch endwhile eval exit extends false float for foreach
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function global if include include_once int integer isset list new null object
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old_function or parent print real require require_once resource return static
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stdclass string switch true unset use var while xor
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__class__ __file__ __function__ __line__ __sleep __wakeup
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]]))
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local word = (lexer.alpha + '_' + R('\127\255')) *
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(lexer.alnum + '_' + R('\127\255'))^0
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-- Identifiers.
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lex:add_rule('identifier', token(lexer.IDENTIFIER, word))
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-- Variables.
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lex:add_rule('variable', token(lexer.VARIABLE, '$' * word))
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-- Strings.
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local sq_str = lexer.delimited_range("'")
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local dq_str = lexer.delimited_range('"')
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local bt_str = lexer.delimited_range('`')
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local heredoc = '<<<' * P(function(input, index)
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local _, e, delimiter = input:find('([%a_][%w_]*)[\n\r\f]+', index)
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if delimiter then
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local _, e = input:find('[\n\r\f]+'..delimiter, e)
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return e and e + 1
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end
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end)
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lex:add_rule('string', token(lexer.STRING, sq_str + dq_str + bt_str + heredoc))
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-- TODO: interpolated code.
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-- Comments.
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local line_comment = (P('//') + '#') * lexer.nonnewline^0
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local block_comment = '/*' * (lexer.any - '*/')^0 * P('*/')^-1
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lex:add_rule('comment', token(lexer.COMMENT, block_comment + line_comment))
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-- Numbers.
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lex:add_rule('number', token(lexer.NUMBER, lexer.float + lexer.integer))
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-- Operators.
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lex:add_rule('operator', token(lexer.OPERATOR, S('!@%^*&()-+=|/?.,;:<>[]{}')))
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-- Embedded in HTML.
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local html = lexer.load('html')
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-- Embedded PHP.
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local php_start_rule = token('php_tag', '<?' * ('php' * lexer.space)^-1)
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local php_end_rule = token('php_tag', '?>')
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html:embed(lex, php_start_rule, php_end_rule)
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lex:add_style('php_tag', lexer.STYLE_EMBEDDED)
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-- Fold points.
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lex:add_fold_point('php_tag', '<?', '?>')
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lex:add_fold_point(lexer.COMMENT, '/*', '*/')
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lex:add_fold_point(lexer.COMMENT, '//', lexer.fold_line_comments('//'))
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lex:add_fold_point(lexer.COMMENT, '#', lexer.fold_line_comments('#'))
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lex:add_fold_point(lexer.OPERATOR, '{', '}')
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lex:add_fold_point(lexer.OPERATOR, '(', ')')
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return lex
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