500 lines
16 KiB
Erlang
500 lines
16 KiB
Erlang
% Grammar for the Elixir language done with yecc
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% Copyright (C) 2011 Jose Valim
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Nonterminals
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grammar expr_list
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expr block_expr fn_expr bracket_expr call_expr max_expr
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base_expr matched_expr matched_op_expr unmatched_expr op_expr
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comma_separator
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add_op mult_op unary_op addadd_op multmult_op bin_concat_op
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match_op arrow_op default_op when_op pipe_op in_op stab_op
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andand_op oror_op and_op or_op comp_expr_op
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open_paren close_paren
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open_bracket close_bracket
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open_curly close_curly
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open_bit close_bit
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comma_expr matched_comma_expr call_args_comma_expr
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call_args call_args_parens call_args_no_parens
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stab_expr stab_expr_list
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kw_eol kw_expr kw_comma kw_base
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matched_kw_expr matched_kw_comma matched_kw_base
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parens_call dot_op dot_identifier dot_do_identifier dot_ref
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dot_paren_identifier dot_punctuated_identifier dot_bracket_identifier
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var list bracket_access bit_string tuple
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fn_block do_block do_eol end_eol block_eol block_item block_list
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.
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Terminals
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identifier kw_identifier punctuated_identifier
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bracket_identifier paren_identifier do_identifier block_identifier
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fn fn_paren 'end' '__aliases__'
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number signed_number atom bin_string list_string sigil
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dot_call_op special_op comp_op
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'not' 'and' 'or' 'xor' 'when' 'in' 'do'
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'true' 'false' 'nil'
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'=' '+' '-' '*' '/' '++' '--' '**' '//'
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'(' ')' '[' ']' '{' '}' '<<' '>>'
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eol ',' '&' '|' '.' '^' '@' '<-' '<>' '->'
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'&&' '||' '!'
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.
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Rootsymbol grammar.
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Left 5 do.
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Right 10 '->'.
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Left 20 ','. % Solve nested call_args conflicts
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Right 30 default_op.
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Right 40 when_op.
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Left 50 pipe_op.
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Right 80 match_op.
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Right 90 arrow_op.
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Left 100 oror_op.
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Left 110 andand_op.
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Left 140 or_op.
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Left 150 and_op.
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Left 160 comp_expr_op.
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Left 170 add_op.
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Left 180 mult_op.
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Right 190 bin_concat_op.
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Right 200 addadd_op.
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Right 210 multmult_op.
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Nonassoc 280 unary_op.
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Nonassoc 290 special_op.
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Left 300 in_op.
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Left 310 dot_call_op.
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Left 310 dot_op.
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Nonassoc 320 var.
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%%% MAIN FLOW OF EXPRESSIONS
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grammar -> eol : [nil].
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grammar -> expr_list : lists:reverse('$1').
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grammar -> eol expr_list : lists:reverse('$2').
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grammar -> expr_list eol : lists:reverse('$1').
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grammar -> eol expr_list eol : lists:reverse('$2').
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grammar -> '$empty' : [nil].
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% Note expressions are on reverse order
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expr_list -> expr : ['$1'].
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expr_list -> expr_list eol expr : ['$3'|'$1'].
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expr -> matched_expr : '$1'.
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expr -> unmatched_expr : '$1'.
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matched_expr -> matched_expr matched_op_expr : build_op(element(1, '$2'), '$1', element(2, '$2')).
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matched_expr -> unary_op matched_expr : build_unary_op('$1', '$2').
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matched_expr -> special_op matched_expr : build_special_op('$1', '$2').
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matched_expr -> fn_expr : '$1'.
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unmatched_expr -> matched_expr op_expr : build_op(element(1, '$2'), '$1', element(2, '$2')).
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unmatched_expr -> unmatched_expr op_expr : build_op(element(1, '$2'), '$1', element(2, '$2')).
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unmatched_expr -> unary_op expr : build_unary_op('$1', '$2').
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unmatched_expr -> special_op expr : build_special_op('$1', '$2').
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unmatched_expr -> block_expr : '$1'.
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op_expr -> match_op expr : { '$1', '$2' }.
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op_expr -> add_op expr : { '$1', '$2' }.
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op_expr -> mult_op expr : { '$1', '$2' }.
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op_expr -> addadd_op expr : { '$1', '$2' }.
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op_expr -> multmult_op expr : { '$1', '$2' }.
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op_expr -> andand_op expr : { '$1', '$2' }.
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op_expr -> oror_op expr : { '$1', '$2' }.
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op_expr -> and_op expr : { '$1', '$2' }.
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op_expr -> or_op expr : { '$1', '$2' }.
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op_expr -> pipe_op expr : { '$1', '$2' }.
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op_expr -> bin_concat_op expr : { '$1', '$2' }.
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op_expr -> in_op expr : { '$1', '$2' }.
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op_expr -> when_op expr : { '$1', '$2' }.
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op_expr -> arrow_op expr : { '$1', '$2' }.
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op_expr -> default_op expr : { '$1', '$2' }.
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op_expr -> comp_expr_op expr : { '$1', '$2' }.
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matched_op_expr -> match_op matched_expr : { '$1', '$2' }.
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matched_op_expr -> add_op matched_expr : { '$1', '$2' }.
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matched_op_expr -> mult_op matched_expr : { '$1', '$2' }.
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matched_op_expr -> addadd_op matched_expr : { '$1', '$2' }.
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matched_op_expr -> multmult_op matched_expr : { '$1', '$2' }.
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matched_op_expr -> andand_op matched_expr : { '$1', '$2' }.
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matched_op_expr -> oror_op matched_expr : { '$1', '$2' }.
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matched_op_expr -> and_op matched_expr : { '$1', '$2' }.
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matched_op_expr -> or_op matched_expr : { '$1', '$2' }.
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matched_op_expr -> pipe_op matched_expr : { '$1', '$2' }.
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matched_op_expr -> bin_concat_op matched_expr : { '$1', '$2' }.
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matched_op_expr -> in_op matched_expr : { '$1', '$2' }.
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matched_op_expr -> when_op matched_expr : { '$1', '$2' }.
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matched_op_expr -> arrow_op matched_expr : { '$1', '$2' }.
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matched_op_expr -> default_op matched_expr : { '$1', '$2' }.
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matched_op_expr -> comp_expr_op matched_expr : { '$1', '$2' }.
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block_expr -> parens_call call_args_parens do_block : build_identifier('$1', '$2' ++ '$3').
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block_expr -> dot_punctuated_identifier call_args_no_parens do_block : build_identifier('$1', '$2' ++ '$3').
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block_expr -> dot_do_identifier do_block : build_identifier('$1', '$2').
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block_expr -> dot_identifier call_args_no_parens do_block : build_identifier('$1', '$2' ++ '$3').
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fn_expr -> fn_paren call_args_parens fn_block : build_identifier('$1', '$2' ++ '$3').
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fn_expr -> fn call_args_no_parens fn_block : build_identifier('$1', '$2' ++ '$3').
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fn_expr -> fn fn_block : build_identifier('$1', '$2').
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fn_expr -> fn_paren call_args_parens : build_identifier('$1', '$2').
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fn_expr -> fn call_args_no_parens : build_identifier('$1', '$2').
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fn_expr -> fn : build_identifier('$1', nil).
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fn_expr -> call_expr : '$1'.
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call_expr -> dot_punctuated_identifier call_args_no_parens : build_identifier('$1', '$2').
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call_expr -> dot_identifier call_args_no_parens : build_identifier('$1', '$2').
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call_expr -> dot_punctuated_identifier : build_identifier('$1', []).
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call_expr -> dot_do_identifier : build_identifier('$1', nil).
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call_expr -> var : build_identifier('$1', nil).
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call_expr -> bracket_expr : '$1'.
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bracket_expr -> dot_bracket_identifier bracket_access : build_access(build_identifier('$1', nil), '$2').
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bracket_expr -> max_expr bracket_access : build_access('$1', '$2').
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bracket_expr -> max_expr : '$1'.
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max_expr -> parens_call call_args_parens : build_identifier('$1', '$2').
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max_expr -> dot_ref : '$1'.
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max_expr -> base_expr : '$1'.
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max_expr -> open_paren ')' : build_block([]).
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max_expr -> open_paren expr_list close_paren : build_block('$2').
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base_expr -> number : ?exprs('$1').
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base_expr -> signed_number : { element(4, '$1'), ?line('$1'), ?exprs('$1') }.
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base_expr -> atom : build_atom('$1').
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base_expr -> list : '$1'.
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base_expr -> tuple : '$1'.
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base_expr -> 'true' : ?op('$1').
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base_expr -> 'false' : ?op('$1').
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base_expr -> 'nil' : ?op('$1').
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base_expr -> '__aliases__' : '$1'.
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base_expr -> bin_string : build_bin_string('$1').
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base_expr -> list_string : build_list_string('$1').
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base_expr -> bit_string : '$1'.
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base_expr -> '&' : '$1'.
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base_expr -> sigil : build_sigil('$1').
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%% Blocks
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fn_block -> '->' grammar 'end' : [[{do,build_block('$2', false)}]].
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do_block -> do_eol 'end' : [[{do,nil}]].
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do_block -> do_eol stab_expr_list end_eol : [[{ do, build_stab(lists:reverse('$2')) }]].
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do_block -> do_eol block_list 'end' : [sort_kw([{ do, nil }|'$2'])].
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do_block -> do_eol stab_expr_list eol block_list 'end' : [sort_kw([{ do, build_stab(lists:reverse('$2')) }|'$4'])].
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do_eol -> 'do' : '$1'.
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do_eol -> 'do' eol : '$1'.
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end_eol -> 'end' : '$1'.
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end_eol -> eol 'end' : '$2'.
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block_eol -> block_identifier : '$1'.
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block_eol -> block_identifier eol : '$1'.
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stab_expr_list -> stab_expr : ['$1'].
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stab_expr_list -> stab_expr_list eol stab_expr : ['$3'|'$1'].
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stab_expr -> expr : '$1'.
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stab_expr -> comma_expr stab_op expr : build_op('$2', lists:reverse('$1'), '$3').
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block_item -> block_eol stab_expr_list eol : { ?exprs('$1'), build_stab(lists:reverse('$2')) }.
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block_item -> block_eol : { ?exprs('$1'), nil }.
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block_list -> block_item : ['$1'].
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block_list -> block_item block_list : ['$1'|'$2'].
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%% Helpers
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var -> dot_identifier : '$1'.
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comma_separator -> ',' : '$1'.
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comma_separator -> ',' eol : '$1'.
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open_paren -> '(' : '$1'.
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open_paren -> '(' eol : '$1'.
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close_paren -> ')' : '$1'.
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close_paren -> eol ')' : '$2'.
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open_bracket -> '[' : '$1'.
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open_bracket -> '[' eol : '$1'.
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close_bracket -> ']' : '$1'.
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close_bracket -> eol ']' : '$2'.
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open_bit -> '<<' : '$1'.
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open_bit -> '<<' eol : '$1'.
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close_bit -> '>>' : '$1'.
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close_bit -> eol '>>' : '$2'.
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open_curly -> '{' : '$1'.
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open_curly -> '{' eol : '$1'.
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close_curly -> '}' : '$1'.
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close_curly -> eol '}' : '$2'.
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% Operators
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add_op -> '+' : '$1'.
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add_op -> '-' : '$1'.
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add_op -> '+' eol : '$1'.
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add_op -> '-' eol : '$1'.
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mult_op -> '*' : '$1'.
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mult_op -> '/' : '$1'.
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mult_op -> '*' eol : '$1'.
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mult_op -> '/' eol : '$1'.
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addadd_op -> '++' : '$1'.
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addadd_op -> '--' : '$1'.
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addadd_op -> '++' eol : '$1'.
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addadd_op -> '--' eol : '$1'.
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multmult_op -> '**' : '$1'.
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multmult_op -> '**' eol : '$1'.
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default_op -> '//' : '$1'.
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default_op -> '//' eol : '$1'.
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unary_op -> '+' : '$1'.
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unary_op -> '+' eol : '$1'.
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unary_op -> '-' : '$1'.
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unary_op -> '-' eol : '$1'.
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unary_op -> '!' : '$1'.
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unary_op -> '!' eol : '$1'.
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unary_op -> '^' : '$1'.
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unary_op -> '^' eol : '$1'.
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unary_op -> 'not' : '$1'.
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unary_op -> 'not' eol : '$1'.
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unary_op -> '@' : '$1'.
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unary_op -> '@' eol : '$1'.
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match_op -> '=' : '$1'.
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match_op -> '=' eol : '$1'.
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andand_op -> '&&' : '$1'.
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andand_op -> '&&' eol : '$1'.
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oror_op -> '||' : '$1'.
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oror_op -> '||' eol : '$1'.
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and_op -> 'and' : '$1'.
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and_op -> 'and' eol : '$1'.
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or_op -> 'or' : '$1'.
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or_op -> 'or' eol : '$1'.
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or_op -> 'xor' : '$1'.
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or_op -> 'xor' eol : '$1'.
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pipe_op -> '|' : '$1'.
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pipe_op -> '|' eol : '$1'.
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bin_concat_op -> '<>' : '$1'.
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bin_concat_op -> '<>' eol : '$1'.
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in_op -> 'in' : '$1'.
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in_op -> 'in' eol : '$1'.
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when_op -> 'when' : '$1'.
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when_op -> 'when' eol : '$1'.
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stab_op -> '->' : '$1'.
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stab_op -> '->' eol : '$1'.
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arrow_op -> '<-' : '$1'.
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arrow_op -> '<-' eol : '$1'.
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comp_expr_op -> comp_op : '$1'.
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comp_expr_op -> comp_op eol : '$1'.
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% Dot operator
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dot_op -> '.' : '$1'.
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dot_op -> '.' eol : '$1'.
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dot_identifier -> identifier : '$1'.
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dot_identifier -> matched_expr dot_op identifier : build_dot('$2', '$1', '$3').
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dot_ref -> matched_expr dot_op '__aliases__' : build_dot_ref('$2', '$1', '$3').
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dot_do_identifier -> do_identifier : '$1'.
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dot_do_identifier -> matched_expr dot_op do_identifier : build_dot('$2', '$1', '$3').
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dot_bracket_identifier -> bracket_identifier : '$1'.
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dot_bracket_identifier -> matched_expr dot_op bracket_identifier : build_dot('$2', '$1', '$3').
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dot_paren_identifier -> paren_identifier : '$1'.
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dot_paren_identifier -> matched_expr dot_op paren_identifier : build_dot('$2', '$1', '$3').
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dot_punctuated_identifier -> punctuated_identifier : '$1'.
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dot_punctuated_identifier -> matched_expr dot_op punctuated_identifier : build_dot('$2', '$1', '$3').
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parens_call -> dot_paren_identifier : '$1'.
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parens_call -> matched_expr dot_call_op : { '.', ?line('$2'), ['$1'] }. % Fun/local calls
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% Function calls
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matched_comma_expr -> matched_expr : ['$1'].
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matched_comma_expr -> matched_comma_expr comma_separator matched_expr : ['$3'|'$1'].
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call_args_no_parens -> matched_comma_expr : lists:reverse('$1').
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call_args_no_parens -> matched_kw_base : ['$1'].
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call_args_no_parens -> matched_comma_expr comma_separator matched_kw_base : lists:reverse(['$3'|'$1']).
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comma_expr -> expr : ['$1'].
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comma_expr -> comma_expr comma_separator expr : ['$3'|'$1'].
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call_args_comma_expr -> comma_expr : lists:reverse('$1').
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call_args_comma_expr -> kw_base : ['$1'].
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call_args_comma_expr -> comma_expr comma_separator kw_base : lists:reverse(['$3'|'$1']).
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call_args_parens -> open_paren ')' : [].
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call_args_parens -> open_paren call_args_comma_expr close_paren : '$2'.
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call_args -> call_args_comma_expr : '$1'.
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% KV
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kw_eol -> kw_identifier : '$1'.
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kw_eol -> kw_identifier eol : '$1'.
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kw_expr -> kw_eol expr : {?exprs('$1'),'$2'}.
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kw_comma -> kw_expr : ['$1'].
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kw_comma -> kw_expr comma_separator kw_comma : ['$1'|'$3'].
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kw_base -> kw_comma : sort_kw('$1').
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matched_kw_expr -> kw_eol matched_expr : {?exprs('$1'),'$2'}.
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matched_kw_comma -> matched_kw_expr : ['$1'].
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matched_kw_comma -> matched_kw_expr comma_separator matched_kw_comma : ['$1'|'$3'].
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matched_kw_base -> matched_kw_comma : sort_kw('$1').
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% Lists
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bracket_access -> open_bracket ']' : { [], ?line('$1') }.
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bracket_access -> open_bracket expr close_bracket : { '$2', ?line('$1') }.
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bracket_access -> open_bracket kw_base close_bracket : { '$2', ?line('$1') }.
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list -> open_bracket ']' : [].
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list -> open_bracket kw_base close_bracket : '$2'.
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list -> open_bracket expr close_bracket : ['$2'].
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list -> open_bracket expr comma_separator call_args close_bracket : ['$2'|'$4'].
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% Tuple
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tuple -> open_curly '}' : build_tuple('$1', []).
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tuple -> open_curly call_args close_curly : build_tuple('$1', '$2').
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% Bitstrings
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bit_string -> open_bit '>>' : { '<<>>', ?line('$1'), [] }.
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bit_string -> open_bit call_args close_bit : { '<<>>', ?line('$1'), '$2' }.
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Erlang code.
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-define(op(Node), element(1, Node)).
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-define(line(Node), element(2, Node)).
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-define(exprs(Node), element(3, Node)).
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% The following directive is needed for (significantly) faster compilation
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% of the generated .erl file by the HiPE compiler. Please do not remove.
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-compile([{hipe,[{regalloc,linear_scan}]}]).
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%% Operators
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build_op(Op, Left, Right) when tuple_size(Op) == 3 ->
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{ ?exprs(Op), ?line(Op), [Left, Right] };
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build_op(Op, Left, Right) ->
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{ ?op(Op), ?line(Op), [Left, Right] }.
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build_unary_op(Op, Expr) ->
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{ ?op(Op), ?line(Op), [Expr] }.
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build_special_op(Op, Expr) ->
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{ ?exprs(Op), ?line(Op), [Expr] }.
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build_tuple(_Marker, [Left, Right]) ->
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{ Left, Right };
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build_tuple(Marker, Args) ->
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{ '{}', ?line(Marker), Args }.
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%% Blocks
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build_block(Exprs) -> build_block(Exprs, true).
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build_block([], _) -> nil;
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build_block([nil], _) -> { '__block__', 0, [nil] };
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build_block([Expr], _) when not is_list(Expr) -> Expr;
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build_block(Exprs, true) -> { '__block__', 0, lists:reverse(Exprs) };
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build_block(Exprs, false) -> { '__block__', 0, Exprs }.
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%% Dots
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build_dot_ref(Dot, { '__aliases__', _, Left }, { '__aliases__', _, Right }) ->
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{ '__aliases__', ?line(Dot), Left ++ Right };
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build_dot_ref(Dot, Other, { '__aliases__', _, Right }) ->
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{ '__aliases__', ?line(Dot), [Other|Right] }.
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build_dot(Dot, Left, Right) ->
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{ '.', ?line(Dot), [Left, extract_identifier(Right)] }.
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%% Identifiers
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build_identifier({ '.', Line, _ } = Dot, Args) ->
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FArgs = case Args of
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|
nil -> [];
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|
_ -> Args
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end,
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{ Dot, Line, FArgs };
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build_identifier({ Keyword, Line }, Args) when Keyword == fn; Keyword == fn_paren ->
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|
{ fn, Line, Args };
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build_identifier({ _, Line, Identifier }, Args) ->
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|
{ Identifier, Line, Args }.
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|
extract_identifier({ Kind, _, Identifier }) when
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|
Kind == identifier; Kind == punctuated_identifier; Kind == bracket_identifier;
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|
Kind == paren_identifier; Kind == do_identifier ->
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|
Identifier;
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extract_identifier(Other) -> Other.
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|
%% Access
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|
|
build_access(Expr, Access) ->
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|
{ access, ?line(Access), [ Expr, ?op(Access) ] }.
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|
%% Interpolation aware
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|
|
build_sigil({ sigil, Line, Sigil, Parts, Modifiers }) ->
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|
{ list_to_atom([$_,$_,Sigil,$_,$_]), Line, [ { '<<>>', Line, Parts }, Modifiers ] }.
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|
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|
build_bin_string({ bin_string, _Line, [H] }) when is_binary(H) -> H;
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|
build_bin_string({ bin_string, Line, Args }) -> { '<<>>', Line, Args }.
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|
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|
build_list_string({ list_string, _Line, [H] }) when is_binary(H) -> binary_to_list(H);
|
|
build_list_string({ list_string, Line, Args }) -> { binary_to_list, Line, [{ '<<>>', Line, Args}] }.
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|
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|
build_atom({ atom, _Line, [H] }) when is_atom(H) -> H;
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|
build_atom({ atom, _Line, [H] }) when is_binary(H) -> binary_to_atom(H, utf8);
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|
build_atom({ atom, Line, Args }) -> { binary_to_atom, Line, [{ '<<>>', Line, Args}, utf8] }.
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|
%% Keywords
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|
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|
build_stab([{ '->', Line, [Left, Right] }|T]) ->
|
|
{ '->', Line, build_stab(T, Left, [Right], []) };
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|
|
|
build_stab(Else) ->
|
|
build_block(Else, false).
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|
|
|
build_stab([{ '->', _, [Left, Right] }|T], Marker, Temp, Acc) ->
|
|
H = { Marker, build_block(Temp) },
|
|
build_stab(T, Left, [Right], [H|Acc]);
|
|
|
|
build_stab([H|T], Marker, Temp, Acc) ->
|
|
build_stab(T, Marker, [H|Temp], Acc);
|
|
|
|
build_stab([], Marker, Temp, Acc) ->
|
|
H = { Marker, build_block(Temp) },
|
|
lists:reverse([H|Acc]).
|
|
|
|
sort_kw(List) -> lists:sort(fun sort_kw/2, List).
|
|
sort_kw({ A, _ }, { B, _ }) -> A =< B. |