C# Class Tidy.Core.Clean

Filters from other formats such as Microsoft Word often make excessive use of presentation markup such as font tags, B, I, and the align attribute. By applying a set of production rules, it is straight forward to transform this to use CSS. Some rules replace some of the children of an element by style properties on the element, e.g. <p><b>...</b></p> -> <p style="font-weight: bold">...</p> Such rules are applied to the element's content and then to the element itself until none of the rules more apply. Having applied all the rules to an element, it will have a style attribute with one or more properties. Other rules strip the element they apply to, replacing it by style properties on the contents, e.g. <dir><li><p>...</li></dir> -> <p style="margin-left 1em">... These rules are applied to an element before processing its content and replace the current element by the first element in the exposed content. After applying both sets of rules, you can replace the style attribute by a class value and style rule in the document head. To support this, an association of styles and class names is built. A naive approach is to rely on string matching to test when two property lists are the same. A better approach would be to first sort the properties before matching.