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-- Copyright 2006-2022 Mitchell. See LICENSE.
-- Django LPeg lexer.
local lexer = require('lexer')
local token, word_match = lexer.token, lexer.word_match
local P, S = lpeg.P, lpeg.S
local lex = lexer.new('django')
-- Whitespace.
lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
-- Keywords.
lex:add_rule('keyword', token(lexer.KEYWORD, word_match{
'as', 'block', 'blocktrans', 'by', 'endblock', 'endblocktrans', 'comment', 'endcomment', 'cycle',
'date', 'debug', 'else', 'extends', 'filter', 'endfilter', 'firstof', 'for', 'endfor', 'if',
'endif', 'ifchanged', 'endifchanged', 'ifnotequal', 'endifnotequal', 'in', 'load', 'not', 'now',
'or', 'parsed', 'regroup', 'ssi', 'trans', 'with', 'widthratio'
}))
-- Functions.
lex:add_rule('function', token(lexer.FUNCTION, word_match{
'add', 'addslashes', 'capfirst', 'center', 'cut', 'date', 'default', 'dictsort',
'dictsortreversed', 'divisibleby', 'escape', 'filesizeformat', 'first', 'fix_ampersands',
'floatformat', 'get_digit', 'join', 'length', 'length_is', 'linebreaks', 'linebreaksbr',
'linenumbers', 'ljust', 'lower', 'make_list', 'phone2numeric', 'pluralize', 'pprint', 'random',
'removetags', 'rjust', 'slice', 'slugify', 'stringformat', 'striptags', 'time', 'timesince',
'title', 'truncatewords', 'unordered_list', 'upper', 'urlencode', 'urlize', 'urlizetrunc',
'wordcount', 'wordwrap', 'yesno'
}))
-- Identifiers.
lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
-- Strings.
lex:add_rule('string', token(lexer.STRING, lexer.range('"', false, false)))
-- Operators.
lex:add_rule('operator', token(lexer.OPERATOR, S(':,.|')))
-- Embed Django in HTML.
local html = lexer.load('html')
local html_comment = lexer.range('<!--', '-->')
local django_comment = lexer.range('{#', '#}', true)
html:modify_rule('comment', token(lexer.COMMENT, html_comment + django_comment))
local django_start_rule = token('django_tag', '{' * S('{%'))
local django_end_rule = token('django_tag', S('%}') * '}')
html:embed(lex, django_start_rule, django_end_rule)
lex:add_style('django_tag', lexer.styles.embedded)
-- Fold points.
lex:add_fold_point('django_tag', '{{', '}}')
lex:add_fold_point('django_tag', '{%', '%}')
return lex
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