Add RelaxNG.validate(streaming:), driving the Brzozowski derivative directly
from the parse-event stream (the libxml2 xmlTextReader model). The derivative
is already incremental: the after-threaded pattern chain is the validation
stack, so only the residual pattern and a light per-element frame (for the
childrenDeriv ignorable-whitespace rule) are retained, never the tree. A
differential test asserts streaming agrees with the trusted tree engine across
valid, invalid, whitespace, and mixed-content documents. XSD streaming remains.
Part of #107, #105
Adds RelaxNG.errors(in:) reporting every way a document fails the schema
as individual located errors with coding paths, recovering past each
failure so all of a faulty document's problems surface at once instead of
only the first. Errors carry recovery hints naming the element types
accepted at the failure point, and distinguish unexpected elements,
invalid or missing attributes, invalid text/datatype content, and missing
required content. RelaxNG.validation() exposes the schema as a
Validation<Node, Void>, composing with the same framework as the XSD,
DTD, and Schematron rules. The boolean derivative engine remains the
authority on validity; the diagnostic walk only places and explains the
failures, recovering each step so it never cascades. Splits the engine
and the diagnostics into separate files.
Compile RELAX NG from both syntaxes and across documents:
- A compact-syntax parser (lexer plus recursive descent) produces the same
pattern algebra the XML syntax compiles to. It covers element and attribute
declarations with name classes and namespace resolution, the , | & combinators
and ? * + cardinality, text/empty/notAllowed, list and mixed, datatypes and
value literals, grammars with start and named definitions (= |= &=), nested
grammars, and include/external references.
- The XML-syntax parser gains include (merging another grammar's definitions,
with the include's own nested definitions overriding) and externalRef
(resolving to an external schema's pattern), both through an injected loader.
Both syntaxes reach the loader through a new schemaLoader parameter that
returns nil by default, so compilation never touches the filesystem or network
unless a loader is supplied.
Closes#68
Add the RELAX NG pattern algebra (Pattern, NameClass), a parser for the XML
syntax into a grammar of start plus named defines, and James Clark's
derivative validation algorithm. The pattern is derived through each
start-tag, attribute, text, and end-tag event with simplifying constructors;
the document is valid when the residual pattern is nullable. Supports
element, attribute, text, empty, notAllowed, group, choice, interleave,
optional, zeroOrMore, oneOrMore, mixed, list, ref/define, data, value, and
the name classes; handles interleave and recursive grammars, reusing the XSD
datatype library for data and value.
Closes#11Closes#12
