Package

eu.cdevreeze.xpathparser

ast

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package ast

Abstract syntax tree of XPath expressions, as produced by the parsers specified in the 'parse' package.

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Type Members

final case class BracedUriLiteral(namespaceOption: Option[String]) extends Product with Serializable

Braced URI literal.
sealed trait EQName extends AnyRef

EQName, so either a URIQualifiedName or a QNameAsEQName.
final case class NCName(name: String) extends Product with Serializable

NCName, that is, a non-colon name.
final case class QNameAsEQName(qname: QName) extends EQName with Product with Serializable
final case class URIQualifiedName(ename: EName) extends EQName with Product with Serializable

Value Members

object BracedUriLiteral extends Serializable
object EQName
object NCName extends Serializable
object QNameAsEQName extends Serializable
object URIQualifiedName extends Serializable
object XPathExpressions

XPath 3.0 AST.
XPath 3.0 AST.
The purpose of this AST is as follows:
- It must represent the syntax tree of a successfully parsed XPath expression
- It is not annotated with more semantic information, like type information that is not included in the XPath expression
- It does not know anything about the context in which it runs, like bound namespaces etc.
- It is rich enough to be able to serialize the AST back to XPath, knowing exactly where to place parentheses, braces, etc.
- It is rich enough to contain operator precedence in the AST itself
- Serialization of the AST to XPath may lead to differences in whitespace (and operator aliases), but other than that the result must be the same
- The AST class hierarchy does not have to use the exact same names as the XPath grammar
Having such an AST of a successfully parsed XPath expression, it must be easy to reliably find used namespace prefixes, for example.
TODO Improve several class names.
TODO XPath 3.1.

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