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|
##### LM #####
lex
ignore /[\t\n ]+/
literal `^ `| `- `, `: `! `? `.
literal `( `) `{ `} `* `& `+
literal `-- `:> `:>> `<: `-> `**
token word /[a-zA-Z_][a-zA-Z0-9_]*/
token uint /[0-9]+/
end
def start
[expression]
{
print_xml( lhs )
}
def expression [term expression_op*]
def expression_op
[`| term]
| [`& term]
| [`- term]
| [`-- term]
def term [factor_rep term_op_list_short]
# This list is done manually to get shortest match.
def term_op_list_short
[]
| [term_op term_op_list_short]
def term_op
[factor_rep]
| [`. factor_rep]
| [`:> factor_rep]
| [`:>> factor_rep]
| [`<: factor_rep]
def factor_rep
[factor_neg factor_rep_op*]
def factor_rep_op
[`*]
| [`**]
| [`?]
| [`+]
| [`{ factor_rep_num `}]
| [`{ `, factor_rep_num `}]
| [`{ factor_rep_num `, `}]
| [`{ factor_rep_num `, factor_rep_num `}]
def factor_rep_num [uint]
def factor_neg
[`! factor_neg]
| [`^ factor_neg]
| [factor]
def factor
[alphabet_num]
| [word]
| [`( expression `)]
def alphabet_num
[uint]
| [`- uint]
parse start[ stdin ]
print( '\n' )
##### IN #####
1 - 1
##### EXP #####
<start><expression><term><factor_rep><factor_neg><factor><alphabet_num><uint>1</uint></alphabet_num></factor></factor_neg><_repeat_factor_rep_op></_repeat_factor_rep_op></factor_rep><term_op_list_short></term_op_list_short></term><_repeat_expression_op><expression_op><_literal_0007>-</_literal_0007><term><factor_rep><factor_neg><factor><alphabet_num><uint>1</uint></alphabet_num></factor></factor_neg><_repeat_factor_rep_op></_repeat_factor_rep_op></factor_rep><term_op_list_short></term_op_list_short></term></expression_op></_repeat_expression_op></expression></start>
|
