Updating xml using c dir 615 validating identity

For performance purposes, “production ready” mainly means it offers resistance to malformed data.

Sacrificing buffer overrun checks to improve performance is not feasible.

Avoiding the copy operation allows us to eliminate both sources of overhead.

Using a technique known as in-place (or ) parsing, the parser can use data from the stream directly. A basic in-place parser takes an input string stored in a contiguous memory buffer, scans the string as a character stream, and creates the necessary tree structure.

Upon encountering a string that is part of the data model, such as a tag name, the parser saves a pointer to the string and its length (/instead of saving the whole string).

As such, this is a tradeoff between performance and memory usage.

This can improve performance in cases where a parser has to do a lot of backtracking, but for parsers a lexer stage is just an extra layer of complexity that increases the per-character overhead.Depending on the content type, an It is possible to support an arbitrary transformation in an in-place parser by modifying the string contents, given an important constraint: a transformation must never increase the length of the string.If it does, the result might overlap with significant data in the document.The goal of a document–and produce a tree of objects that represents the same document in memory.A parser typically consists of two stages: a lexer and a parser.