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|
context ruby_here
{
rl ident_pattern /[a-zA-Z_][a-zA-Z_0-9]*/
rl number_pattern /[0-9]+/
lex start
{
ignore /[ \t\n]+/
token id /ident_pattern/
token number /number_pattern/
literal '<<', '*', ',', '(', ')', '!'
}
HereId: str
token rest_of_line /[^\n]*'\n'/
lex here_start
{
ignore /[ \t\n]+/
token here_id
HereData: here_data
/ident_pattern/
{
# Take the text of the here_id from the input stream.
HereId = input.pull( match_length )
# Get the data up to the rest of the line.
parse_stop ROL: rest_of_line( ctx input )
# Parse the heredoc data.
parse_stop HereData: here_data( ctx input )
# Push the rest-of-line data back to the input stream.
input.push( $ROL )
# Send the here_id token. Attach the heredoc data as an attribute.
input.push( make_token( typeid<here_id> HereId HereData ) )
}
}
lex here_data
{
token here_close_id
/ ident_pattern '\n' /
{
if match_text == HereId + '\n' {
input.push( make_token(
typeid<here_close_id>
input.pull( match_length ) ) )
}
else
input.push( make_token( typeid<here_line> input.pull(match_length) ) )
}
token here_line
/ [^\n]* '\n' /
}
def here_data
[here_line* here_close_id]
def heredoc
['<<' here_id]
def primary
[id]
| [number]
| [heredoc]
def arglist
[primary arglist_more*]
def arglist_more
[',' primary]
def call
[id '(' arglist? ')']
def statement
[primary]
| [call]
token foobar /any+/
def item
[statement '!']
| [foobar]
def start
[item*]
}
CTX: ruby_here = cons ruby_here []
S: ruby_here::start = parse ruby_here::start( CTX stdin )
print_xml(S)
print('\n')
|
