of the new doc overrides the base <title> unless the base // contains {{content}}, in which case the new title is substituted // - <style> elements from the new doc are placed after any base <style> // - all other elements are appended to the base // // <body> // - the <header> and <footer> and <main> elemnts are merged. // in the base document, these elements may appear abitrarily nested inside // wrapper elements; mergehtml will reproduce that structure in the merged document. // if there are multiples, only the first will be used for merging. // if they do not appear in the base doc, they will be appended to the body (header: prepended). // in the source document, these elements will be removed from any // containing elements before merging. if there are multiples their contents // will be concatenated. // html5 allows multiple <main> elements if all but one are hidden. mergehtml does not. // - <script> elements are placed at the end of the body // - all other elements are appended to <main> if it exists, or <body> if not. // // any classes attached to the <body>, <header>, <footer>, or <main> will be merged. // // all scripts and images will be collected and returned in the Assets object // func Merge(base, doc io.Reader) (merged string, assets *Assets, _ error) func merge(base, doc *html.Node) (out *html.Node, assets *Assets) { assets = new(Assets) out, err = html.Parse("<!doctype html><html><head></head><body></body></html>") if err != nil { panic("mergehtml: internal error: " + err.Error()) } }

package internal import ( "io" "golang.org/x/net/html" ) type Doc struct{} type Assets struct { Images []Asset Styles []Asset Scripts []Asset } // Merges an HTML document over top of a base template. // // // - of the new doc overrides the base <title> unless the base // contains {{content}}, in which case the new title is substituted // - <style> elements from the new doc are placed after any base <style> // - all other elements are appended to the base // // <body> // - the <header> and <footer> and <main> elemnts are merged. // in the base document, these elements may appear abitrarily nested inside // wrapper elements; mergehtml will reproduce that structure in the merged document. // if there are multiples, only the first will be used for merging. // if they do not appear in the base doc, they will be appended to the body (header: prepended). // in the source document, these elements will be removed from any // containing elements before merging. if there are multiples their contents // will be concatenated. // html5 allows multiple <main> elements if all but one are hidden. mergehtml does not. // - <script> elements are placed at the end of the body // - all other elements are appended to <main> if it exists, or <body> if not. // // any classes attached to the <body>, <header>, <footer>, or <main> will be merged. // // all scripts and images will be collected and returned in the Assets object // func Merge(base, doc io.Reader) (merged string, assets *Assets, _ error) func merge(base, doc *html.Node) (out *html.Node, assets *Assets) { assets = new(Assets) out, err = html.Parse("<!doctype html><html><head></head><body></body></html>") if err != nil { panic("mergehtml: internal error: " + err.Error()) } }