Created
June 8, 2009 11:52
-
-
Save anonymous/125772 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
grammar Grmmr | |
{ | |
rule TOP | |
{ | |
<suite> | |
{*} | |
}; | |
token suite | |
{ | |
<var_stmt> \n <var_stmt> | |
{*} | |
}; | |
token var_stmt | |
{ | |
'var ' <identifier> ' ' <assignoperator> ' ' <expression> | |
{*} | |
}; | |
token identifier | |
{ | |
<[a..z]> \w* | |
{*} | |
}; | |
token assignoperator | |
{ | |
| '=' {*} #= assign | |
| '+=' {*} #= add | |
| '-=' {*} #= sub | |
| '*=' {*} #= mul | |
| '/=' {*} #= div | |
| '\%=' {*} #= mod | |
| '||=' {*} #= or | |
| '&&=' {*} #= and | |
}; | |
token expression | |
{ | |
<or_test> | |
{*} | |
}; | |
token or_test | |
{ | |
<xor_test> [ 'or' <xor_test> ]* | |
{*} | |
}; | |
token xor_test | |
{ | |
<and_test> [ 'xor' <and_test> ]* | |
{*} | |
}; | |
token and_test | |
{ | |
<not_test> [ 'and' <not_test> ]* | |
{*} | |
}; | |
token not_test | |
{ | |
['not']? <comparison> | |
{*} | |
}; | |
token comparison | |
{ | |
<variable> ** <operator> | |
{*} | |
}; | |
token variable | |
{ | |
| <identifier> {*} #= identifier | |
| <number> {*} #= number | |
| <string> {*} #= string | |
}; | |
token number | |
{ | |
\d+ [ '.' \d+ ]? {*} | |
}; | |
token string | |
{ | |
'"' .* '"' {*} | |
}; | |
token operator | |
{ | |
| '~' {*} #= concat | |
| '+' {*} #= plus | |
| '-' {*} #= sub | |
| '*' {*} #= mul | |
| '/' {*} #= div | |
| '%' {*} #= mod | |
| '==' {*} #= eq | |
| '!=' {*} #= ne | |
| '<=' {*} #= leq | |
| '>=' {*} #= geq | |
| '<' {*} #= lt | |
| '>' {*} #= gt | |
}; | |
}; | |
my $action = Actions.new(); Grmmr.parse("var alpha = 3 + 8\nvar beta += 7", :action($action)); |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment