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|
comments
'#
end comments
tokens
union "\[[(\\\c)#\]]*\]"
end tokens
compounds
'%% '%%{ '}%% '== ':= '-> '<> '>= '<= '=>
'|* '*|
'>! '<! '$! '%! '@! '<>!
'>/ '</ '$/ '%/ '@/ '<>/
end compounds
keys
'int 'bool 'true 'false 'char 'ptr
'if 'else 'printi 'prints 'printb 'print_token
'fc 'fpc 'fbreak 'fgoto 'fcall 'fret 'fhold 'fexec
'machine 'alphtype 'action
'first_token_char
end keys
define lang_indep
[al_statements]
'%% [NL]
[al_statements]
[ragel_def]
end define
define ragel_def
'%%{ [NL] [IN]
[ragel_program]
[EX] '}%% [NL]
end define
define ragel_program
[repeat statement]
end define
define statement
[machine_stmt]
| [alphtype_stmt]
| [action_stmt]
| [cond_action_stmt]
| [machine_def]
| [machine_inst]
end define
define machine_stmt
'machine [id] '; [NL]
end define
define alphtype_stmt
'alphtype [repeat id] '; [NL]
end define
define action_stmt
'action [id] [al_host_block]
end define
define cond_action_stmt
'action [id] '{ [al_expr] '} [NL]
end define
define al_statements
[repeat action_lang_stmt]
end define
define action_lang_stmt
[al_ragel_stmt]
| [al_variable_decl]
| [al_expr_stmt]
| [al_if_stmt]
| [al_print_stmt]
| '{ [al_statements] '}
end define
define al_print_stmt
[print_cmd] [al_expr] '; [NL]
| 'print_token '; [NL]
end define
define print_cmd
'printi | 'prints | 'printb
end define
define al_variable_decl
[al_type_decl] [id] [opt union] '; [NL]
end define
define al_array_decl
'[ [number] ']
end define
define al_type_decl
'int | 'bool | 'char | 'ptr
end define
define al_expr_stmt
[al_expr] '; [NL]
end define
define al_expr
[al_term] [repeat al_expr_extend]
end define
define al_expr_extend
[al_expr_op] [al_term]
end define
define al_expr_op
'= | '+ | '- | '* | '/ | '== | '<= | '>= | '< | '>
end define
define al_term
[al_term_base] [opt union]
end define
define al_term_base
[id]
| [SPOFF] [id] '( [SPON] [al_expr] ')
| [opt al_sign] [number]
| [stringlit]
| [charlit]
| 'fc
| 'true
| 'false
| '( [al_expr] ')
| 'first_token_char
end define
define al_sign
'- | '+
end define
define al_if_stmt
'if '( [al_expr] ') [NL] [IN]
[action_lang_stmt] [EX]
[opt al_else]
end define
define al_else
'else [NL] [IN]
[action_lang_stmt] [EX]
end define
define al_ragel_stmt
'fbreak '; [NL]
| 'fhold '; [NL]
| 'fexec [repeat al_expr] '; [NL]
| 'fnext [id] '; [NL]
| 'fgoto [id] '; [NL]
| 'fcall [id] '; [NL]
| 'fnext '* [repeat al_expr] '; [NL]
| 'fgoto '* [repeat al_expr] '; [NL]
| 'fcall '* [repeat al_expr] '; [NL]
| 'fret '; [NL]
end define
define machine_def
[id] '= [machine_expr] '; [NL]
end define
define machine_inst
[id] ':= [machine_expr] '; [NL]
end define
define machine_expr
[repeat machine_expr_item]
end define
define scanner_item
[repeat machine_expr_item] '; [NL]
end define
define machine_expr_item
[action_embed] [al_host_block]
| '|* [repeat scanner_item] '*|
| [not ';] [not '*|] [token]
end define
define al_host_block
'{ [NL] [IN] [al_statements] [EX] '} [NL]
end define
define action_embed
'> | '$ | '@ | '% |
'$! | '=>
end define
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