-- Copyright 2015-2018 Jason Schindler. See License.txt.
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-- Fish (http://fishshell.com/) script 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 = lpeg.P, lpeg.R, lpeg.S
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local lex = lexer.new('fish')
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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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alias and begin bg bind block break breakpoint builtin case cd command
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commandline complete contains continue count dirh dirs echo else emit end eval
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exec exit fg fish fish_config fishd fish_indent fish_pager fish_prompt
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fish_right_prompt fish_update_completions for funced funcsave function
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functions help history if in isatty jobs math mimedb nextd not open or popd
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prevd psub pushd pwd random read return set set_color source status switch
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test trap type ulimit umask vared while
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]]))
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-- Identifiers.
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lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
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-- Variables.
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lex:add_rule('variable', token(lexer.VARIABLE,
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'$' * (lexer.word +
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lexer.delimited_range('{}', true, true))))
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-- Strings.
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local sq_str = lexer.delimited_range("'", false, true)
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local dq_str = lexer.delimited_range('"')
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lex:add_rule('string', token(lexer.STRING, sq_str + dq_str))
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-- Shebang.
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lex:add_rule('shebang', token('shebang', '#!/' * lexer.nonnewline^0))
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lex:add_style('shebang', lexer.STYLE_LABEL)
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-- Comments.
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lex:add_rule('comment', token(lexer.COMMENT, '#' * lexer.nonnewline^0))
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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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-- Fold points.
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lex:add_fold_point(lexer.KEYWORD, 'begin', 'end')
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lex:add_fold_point(lexer.KEYWORD, 'for', 'end')
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lex:add_fold_point(lexer.KEYWORD, 'function', 'end')
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lex:add_fold_point(lexer.KEYWORD, 'if', 'end')
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lex:add_fold_point(lexer.KEYWORD, 'switch', 'end')
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lex:add_fold_point(lexer.KEYWORD, 'while', 'end')
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return lex
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