问题
All I managed to get working is STRING, PARAMS, VARIABLE and FUNCNAME There seems to be a problem with FUNCTION, but I just can't see it.
use strict;
use Parse::RecDescent;
$::RD_ERRORS = 1; # Make sure the parser dies when it encounters an error
$::RD_WARN = 1; # Enable warnings. This will warn on unused rules &c.
$::RD_HINT = 1; # Give out hints to help fix problems.
my $grammar = <<'_GRAMMAR_';
SCRIPT : INSTRUCTION(s /;/)
INSTRUCTION: FUNCTION | VARIABLE "=" FUNCTION
FUNCTION : FUNCNAME "[" PARAMETERS "]"
FUNCNAME : "print" | "add2" | "save" # ok
PARAMETERS : STRING | STRING /\s*\,\s*/ PARAMETERS # ok
VARIABLE : /\w[A-Za-z-0-9]{0,10}/i # ok
STRING : /'(?:[^'\\]|\\.)*'/ # ok
_GRAMMAR_
my $parser2 = Parse::RecDescent->new($grammar);
#i test every rule here
print "STRING OK\n" if $parser2->STRING("'asd'");
print "PARAMS OK\n" if $parser2->PARAMETERS("'asd','XCV','vfgdg'");
print "SCRIPT OK\n" if $parser2->SCRIPT(q(print['hola','asd'];save['hello'];));
print "VARIABLE OK \n" if $parser2->VARIABLE("a1");
print "FUNCTION OK\n" if $parser2->FUNCTION(q(print['hola','asd']));
print "FUNCNAME OK\n" if $parser2->FUNCNAME(q(print));
print "INSTRUCTION OK\n" if $parser2->FUNCTION(q(a0=print['hola','asd'];));
Any help? BTW my target is this:
variable=functioname['param1','param2','paramN'];
function2['param1'];
etc etc
回答1:
This works for me (particularly, look at [A-Za-z0-9]
):
my $grammar = <<'_GRAMMAR_';
SCRIPT : INSTRUCTION(s /;/) /\Z/
INSTRUCTION: VARIABLE EQ FUNCTION | FUNCTION
FUNCTION : FUNCNAME '[' PARAMETERS ']'
FUNCNAME : "print" | "add2" | "save"
PARAMETERS : STRING(s /,/)
VARIABLE : /(\w[A-Za-z0-9]{0,10})/i
EQ: '='
STRING : /'(?:[^'\\]|\\.)*'/ # ok
_GRAMMAR_
来源:https://stackoverflow.com/questions/11598761/parserecdescent-grammar-not-working-as-expected