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|
%left SeqOp
%left 'or'
%left 'and'
%left 'not'
%left UnionOp
%left 'intersect'
%left COMPARE
%left MATCH
%left '/' '//'
%left '!'
%left '[' ']'
%left '(' ')'
%%
Query: Sequence
;
WildNCName: NCName | '*'
;
#?? not sure about NCName
WildQName: WildNCName { [ Name => $_[1] ]; }
| WildNCName ':' WildNCName {
[ NameSpace => $_[1], Name => $_[2]]; }
;
Param: Disjunction
| INTEGER { new XML::XQL::Number ($_[1]); }
| NUMBER { new XML::XQL::Number ($_[1]); }
| TEXT { new XML::XQL::Text ($_[1]); }
;
ElementName: WildQName { new XML::XQL::Element (@{$_[1]}); }
;
AttributeName: '@' WildQName { new XML::XQL::Attribute (@{$_[2]}); }
;
Invocation: XQLName_Paren Invocation_2 {
my ($func, $type) = $_[0]->{Query}->findFunctionOrMethod ($_[1], $_[2]);
new XML::XQL::Invocation (Name => $_[1],
Args => $_[2],
Func => $func,
Type => $type); }
;
Invocation_2: ')' { [] }
| Param Invocation_3 ')' { unshift @{$_[2]}, $_[1]; $_[2]; }
;
Invocation_3: /* empty */ { [] }
| ',' Param Invocation_3 { unshift @{$_[3]}, $_[2]; $_[3]; }
;
PathOp: '/' | '//'
;
Sequence: Disjunction
| Disjunction SeqOp Sequence {
new XML::XQL::Sequence (Left => $_[1], Oper => $_[2],
Right => $_[3]); }
;
Disjunction: Conjunction
| Conjunction 'or' Disjunction {
new XML::XQL::Or (Left => $_[1], Right => $_[3]); }
;
Conjunction: Negation
| Negation 'and' Conjunction {
new XML::XQL::And (Left => $_[1], Right => $_[3]); }
;
Negation: Union
| 'not' Negation { new XML::XQL::Not (Left => $_[2]); }
;
Union: Intersection
| Intersection UnionOp Union {
new XML::XQL::Union (Left => $_[1], Right => $_[3]); }
;
Intersection: Comparison
| Comparison 'intersect' Intersection {
new XML::XQL::Intersect (Left => $_[1], Right => $_[3]); }
;
ComparisonOp: COMPARE {
[ $_[1], $_[0]->{Query}->findComparisonOperator ($_[1]) ]; }
| MATCH {
[ $_[1], $_[0]->{Query}->findComparisonOperator ($_[1]) ]; }
;
Comparison: Path
| LValue ComparisonOp RValue {
new XML::XQL::Compare (All => 0, Left => $_[1],
Oper => $_[2]->[0], Func => $_[2]->[1],
Right => $_[3]); }
| 'any' LValue ComparisonOp RValue {
new XML::XQL::Compare (All => 0, Left => $_[2],
Oper => $_[3]->[0], Func => $_[3]->[1],
Right => $_[4]); }
| 'all' LValue ComparisonOp RValue {
new XML::XQL::Compare (All => 1, Left => $_[2],
Oper => $_[3]->[0], Func => $_[3]->[1],
Right => $_[4]); }
;
LValue: Path
;
RValue: Path
| INTEGER { new XML::XQL::Number ($_[1]); }
| NUMBER { new XML::XQL::Number ($_[1]); }
| TEXT { new XML::XQL::Text ($_[1]); }
;
Path: AbsolutePath | RelativePath
;
AbsolutePath: '/' { new XML::Root; }
| PathOp RelativePath {
new XML::XQL::Path (PathOp => $_[1], Right => $_[2]); }
;
RelativePath: Bang
| Bang PathOp RelativePath {
new XML::XQL::Path (Left => $_[1], PathOp => $_[2],
Right => $_[3]); }
;
Bang: Subscript
| Subscript '!' Invocation {
XML::XQL::parseError ("only methods (not functions) can be used after the Bang (near '!" . $_[3]->{Name} . "'")
unless $_[3]->isMethod;
new XML::XQL::Bang (Left => $_[1],
Right => $_[3]); }
;
Subscript: Filter Subscript_2 {
defined($_[2]) ?
new XML::XQL::Subscript (Left => $_[1],
IndexList => $_[2]) : $_[1]; }
;
Subscript_2: /* empty */
| '[' IndexList ']' { $_[2]; }
#?? The following line *IS* part of the XQL spec, but it doesn't make sense
#?? | '[' ']'
;
IndexList: IndexArg IndexList_2 { push (@{$_[1]}, @{$_[2]}); $_[1]; }
;
IndexList_2: /* empty */ { [] }
| ',' IndexArg IndexList_2 { push (@{$_[2]}, @{$_[3]}); $_[2]; }
;
IndexArg: INTEGER { [ $_[1], $_[1] ]; }
| Range
;
Range: INTEGER 'to' INTEGER {
# Syntactic Constraint 9:
# If both integers are positive or if both integers are
# negative, the first integer must be less than or
# equal to the second integer.
XML::XQL::parseError (
"$_[1] should be less than $_[3] in '$_[1] $_[2] $_[3]'")
if ($_[1] > $_[3] && ($_[1] < 0) == ($_[3] < 0));
[ $_[1], $_[3] ]; }
;
Filter: Grouping
| Filter '[' Subquery ']' {
new XML::XQL::Filter (Left => $_[1], Right => $_[3]); }
;
#?? Eliminate Subquery
Subquery: Query
;
Grouping: RelativeTerm
| '(' Query ')' { $_[2]; }
;
RelativeTerm: '.' { new XML::XQL::Current; }
| '..' { new XML::XQL::Parent; }
| Invocation
| ElementName
| AttributeName
;
%%
|
