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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
[expression `| term_short]
| [expression `& term_short]
| [expression `- term_short]
| [expression `-- term_short]
| [term_short]
# Works, but is confusing.
def term_short
reducefirst
[term]
def term
[term factor_with_rep]
| [term `. factor_with_rep]
| [term `:> factor_with_rep]
| [term `:>> factor_with_rep]
| [term `<: factor_with_rep]
| [factor_with_rep]
def factor_with_rep
[factor_with_rep `*]
| [factor_with_rep `**]
| [factor_with_rep `?]
| [factor_with_rep `+]
| [factor_with_rep `{ factor_rep_num `}]
| [factor_with_rep `{ `, factor_rep_num `}]
| [factor_with_rep `{ factor_rep_num `, `}]
| [factor_with_rep `{ factor_rep_num `, factor_rep_num `}]
| [factor_with_neg]
def factor_rep_num [uint]
def factor_with_neg
[`! factor_with_neg]
| [`^ factor_with_neg]
| [factor]
def factor
[alphabet_num]
| [word]
| [`( expression `)]
def alphabet_num
[uint]
| [`- uint]
parse start[ stdin ]
print( '\n' )
##### IN #####
1 - 1
##### EXP #####
<start><expression><expression><term_short><term><factor_with_rep><factor_with_neg><factor><alphabet_num><uint>1</uint></alphabet_num></factor></factor_with_neg></factor_with_rep></term></term_short></expression><_literal_0007>-</_literal_0007><term_short><term><factor_with_rep><factor_with_neg><factor><alphabet_num><uint>1</uint></alphabet_num></factor></factor_with_neg></factor_with_rep></term></term_short></expression></start>
|
