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comparison python/burg.x @ 319:8d07a4254f04

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Work on burg
author Windel Bouwman
date Sat, 18 Jan 2014 18:58:43 +0100
parents e84047f29c78
children 44f336460c2a
comparison
equal deleted inserted replaced
318:e84047f29c78 319:8d07a4254f04
1 1
2 from tree import Tree 2 %tokens ':' ';' '(' ')' ',' template id number '%%' '%terminal'
3 %tokens ':' ';' '(' ')' ',' template id number '%%' header
4 3
5 %% 4 %%
6 5
7 rule: id ':' tree template cost { self.add_rule($1, $3, $4, $5) }; 6 burgdef: directives '%%' rules;
8 7
9 cost: number { return number.val }; 8 directives:
9 | directives directive;
10 10
11 tree: id { return Tree($1) } 11 directive: termdef;
12 | id '(' tree ')' { return Tree($1, $3) }
13 | id '(' tree ',' tree ')' { return Tree($1, $3, $5) };
14 12
13 termdef: '%terminal' termids;
15 14
15 termids:
16 | termids termid;
17
18 termid: id { self.system.add_terminal($1.val) };
19
20 rules:
21 | rules rule;
22
23 rule: id ':' tree cost template { self.system.add_rule($1.val, $3, $4, $5.val) };
24
25 cost: number { return $1.val };
26
27 tree: id { return self.system.tree($1.val) }
28 | id '(' tree ')' { return self.system.tree($1.val, $3) }
29 | id '(' tree ',' tree ')' { return self.system.tree($1.val, $3, $5) };
30