[−][src]Crate xmlparser

xmlparser is a low-level, pull-based, zero-allocation XML 1.0 parser.

Example

for token in xmlparser::Tokenizer::from("<tagname name='value'/>") {
    println!("{:?}", token);
}

Why a new library

The main idea of this library is to provide a fast, low-level and complete XML parser.

Unlike other XML parsers, this one can return tokens not with &str/&[u8] data, but with StrSpan objects, which contain a position of the data in the original document. Which can be very useful if you want to post-process tokens even more and want to return errors with a meaningful position.

So, this is basically an XML parser framework that can be used to write parsers for XML-based formats, like SVG and to construct a DOM.

At the time of writing the only option was quick-xml (v0.10), which does not support DTD and token positions.

If you are looking for a more high-level solution - checkout roxmltree.

Benefits

  • All tokens contain StrSpan objects which contain a position of the data in the original document.
  • Good error processing. All error types contain position (line:column) where it occurred.
  • No heap allocations.
  • No dependencies.
  • Tiny. ~1500 LOC and ~40KiB in the release build according to the cargo-bloat.

Limitations

  • Currently, only ENTITY objects are parsed from the DOCTYPE. Other ignored.
  • No tree structure validation. So an XML like <root><child></root></child> will be parsed without errors. You should check for this manually. On the other hand <a/><a/> will lead to an error.
  • Duplicated attributes is not an error. So an XML like <item a="v1" a="v2"/> will be parsed without errors. You should check for this manually.
  • UTF-8 only.

Safety

  • The library must not panic. Any panic considered as a critical bug and should be reported.
  • The library forbids the unsafe code.

Structs

ByteStream

A streaming text parsing interface.

StrSpan

An immutable string slice.

Stream

A streaming XML parsing interface.

TextPos

Position in text.

Tokenizer

Tokenizer for the XML structure.

Enums

ElementEnd

ElementEnd token.

EntityDefinition

Representation of the EntityDef value.

Error

An XML parser errors.

ExternalId

Representation of the ExternalID value.

Reference

Representation of the Reference value.

StreamError

A stream parser errors.

Token

An XML token.

TokenType

List of token types.

Traits

XmlByteExt

Extension methods for XML-subset only operations.

XmlCharExt

Extension methods for XML-subset only operations.