Module parser 

XPath 1.0 Expression Parser (§25).

Parses token streams from the lexer into the AST defined in ast.rs. Implements the full XPath 1.0 grammar.

UPSTREAM-PARITY

Grammar (from XPath 1.0 spec §3.7):

Expr        ::= OrExpr
OrExpr      ::= AndExpr ('or' AndExpr)*
AndExpr     ::= EqualityExpr ('and' EqualityExpr)*
EqualityExpr ::= RelationalExpr (('=' | '!=') RelationalExpr)*
RelationalExpr ::= AdditiveExpr (('<' | '>' | '<=' | '>=') AdditiveExpr)*
AdditiveExpr ::= MultiplicativeExpr (('+' | '-') MultiplicativeExpr)*
MultiplicativeExpr ::= UnaryExpr (('*' | 'div' | 'mod') UnaryExpr)*
UnaryExpr   ::= '-'* UnionExpr
UnionExpr   ::= PathExpr ('|' PathExpr)*
PathExpr    ::= LocationPath | FilterExpr (('/' | '//') RelativeLocationPath)?
LocationPath ::= AbsoluteLocationPath | RelativeLocationPath
AbsoluteLocationPath ::= '/' RelativeLocationPath? | '//' RelativeLocationPath
RelativeLocationPath ::= Step (('/' | '//') Step)*
Step        ::= AxisSpecifier NodeTest Predicate*
             |  AbbreviatedStep
AxisSpecifier ::= AxisName '::' | '@'?
AbbreviatedStep ::= '.' | '..'
Predicate   ::= '[' Expr ']'
FilterExpr  ::= PrimaryExpr Predicate*
PrimaryExpr ::= VariableReference | '(' Expr ')' | Literal | Number | FunctionCall

Courts

XPATH-PARSER-*

Structs

ParseError

Errors that can occur during parsing.

Parser

Functions

parse_xpath

Parse an XPath expression string into an AST.