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-- Copyright 2006-2016 Mitchell mitchell.att.foicica.com. See LICENSE.
-- XML 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 = 'xml'}
-- Whitespace.
local ws = token(l.WHITESPACE, l.space^1)
-- Comments and CDATA.
local comment = token(l.COMMENT, '<!--' * (l.any - '-->')^0 * P('-->')^-1)
local cdata = token('cdata', '<![CDATA[' * (l.any - ']]>')^0 * P(']]>')^-1)
-- Strings.
local sq_str = l.delimited_range("'", false, true)
local dq_str = l.delimited_range('"', false, true)
local string = #S('\'"') * l.last_char_includes('=') *
token(l.STRING, sq_str + dq_str)
local in_tag = P(function(input, index)
local before = input:sub(1, index - 1)
local s, e = before:find('<[^>]-$'), before:find('>[^<]-$')
if s and e then return s > e and index or nil end
if s then return index end
return input:find('^[^<]->', index) and index or nil
end)
-- Numbers.
local number = #l.digit * l.last_char_includes('=') *
token(l.NUMBER, l.digit^1 * P('%')^-1) * in_tag
local alpha = R('az', 'AZ', '\127\255')
local word_char = l.alnum + S('_-:.??')
local identifier = (l.alpha + S('_-:.??')) * word_char^0
local namespace = token(l.OPERATOR, ':') * token('namespace', identifier)
-- Elements.
local element = token('element', '<' * P('/')^-1 * identifier) * namespace^-1
-- Attributes.
local attribute = token('attribute', identifier) * namespace^-1 *
#(l.space^0 * '=')
-- Closing tags.
local close_tag = token('element', P('/')^-1 * '>')
-- Equals.
local equals = token(l.OPERATOR, '=') * in_tag
-- Entities.
local entity = token('entity', '&' * word_match{
'lt', 'gt', 'amp', 'apos', 'quot'
} * ';')
-- Doctypes and other markup tags.
local doctype = token('doctype', P('<!DOCTYPE')) * ws *
token('doctype', identifier) * (ws * identifier)^-1 *
(1 - P('>'))^0 * token('doctype', '>')
-- Processing instructions.
local proc_insn = token('proc_insn', P('<?') * (1 - P('?>'))^0 * P('?>')^-1)
M._rules = {
{'whitespace', ws},
{'comment', comment},
{'cdata', cdata},
{'doctype', doctype},
{'proc_insn', proc_insn},
{'element', element},
{'close_tag', close_tag},
{'attribute', attribute},
{'equals', equals},
{'string', string},
{'number', number},
{'entity', entity},
}
M._tokenstyles = {
element = l.STYLE_KEYWORD,
namespace = l.STYLE_CLASS,
attribute = l.STYLE_TYPE,
cdata = l.STYLE_COMMENT,
entity = l.STYLE_OPERATOR,
doctype = l.STYLE_COMMENT,
proc_insn = l.STYLE_COMMENT,
--markup = l.STYLE_COMMENT
}
M._foldsymbols = {
_patterns = {'</?', '/>', '<!%-%-', '%-%->', '<!%[CDATA%[', '%]%]>'},
element = {['<'] = 1, ['/>'] = -1, ['</'] = -1},
[l.COMMENT] = {['<!--'] = 1, ['-->'] = -1},
cdata = {['<![CDATA['] = 1, [']]>'] = -1}
}
return M
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