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Correctly allow rule labels to be optional

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Thomas Krijnen
2016-04-09 13:29:35 +02:00
parent 9bcfe2f50e
commit 191c029546
2 changed files with 23 additions and 15 deletions
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src/ifcexpressparser/express.bnf
+2 -4
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@@ -1,5 +1,3 @@
# Taken from http://sourceforge.net/p/exp-engine/expresso/ci/master/tree/docs/iso-10303-11--2004.bnf
ABS = "abs" .
ABSTRACT = "abstract" .
ACOS = "acos" .
@@ -202,7 +200,7 @@ constructed_types = enumeration_type | select_type .
declaration = entity_decl | function_decl | procedure_decl | subtype_constraint_decl | type_decl .
derived_attr = attribute_decl ":" parameter_type ":=" expression ";" .
derive_clause = DERIVE derived_attr { derived_attr } .
domain_rule = rule_label_id ":" expression .
domain_rule = [ rule_label_id ":" ] expression .
element = expression [ ":" repetition ] .
entity_body = { explicit_attr } [ derive_clause ] [ inverse_clause ] [ unique_clause ] [ where_clause ] .
entity_constructor = entity_ref "(" [ expression { "," expression } ] ")" .
@@ -334,7 +332,7 @@ type_label_id = simple_id .
unary_op = "+" | "-" | NOT .
underlying_type = constructed_types | concrete_types .
unique_clause = UNIQUE unique_rule ";" { unique_rule ";" } .
unique_rule = rule_label_id ":" referenced_attribute { "," referenced_attribute } .
unique_rule = [ rule_label_id ":" ] referenced_attribute { "," referenced_attribute } .
until_control = UNTIL logical_expression .
use_clause = USE FROM schema_ref [ "(" named_type_or_rename { "," named_type_or_rename } ")" ] ";" .
variable_id = simple_id .