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revlog: efficient implementation of 'descendant'...

revlog: efficient implementation of 'descendant' Iterating over descendants is costly, because there are no "parent -> children" pointers. Walking the other way around is much more efficient, especially on large repositories, where descendant walks can cost seconds. And the other hand, common ancestors code follows links in the right direction and has a compiled implementation. In real life usage, this saved up to 80s during some pull operations, where descendant test happens in extension code.

Robert Bachmann - - Load All Authors

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             xml.rnc
        
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             | 1.2 KiB
            
                | application/relax-ng-compact-syntax
            
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                RNCCompactLexer
            
             / contrib / xml.rnc
          
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      # RelaxNG schema for "xml" log style

      # Inspired by Subversion's XML log format.

      start = log

      node.type = xsd:string  {minLength = "40" maxLength = "40"}

      log = element log { logentry+ }

      logentry = element logentry {

          logentry.attlist,

          branch*, tag*, hgparent*,

          author, date,

          msg, paths?, copies?, extra*

      }

      logentry.attlist =

          attribute revision {xsd:nonNegativeInteger}

        & attribute node {node.type}

      branch = element branch { text }

      tag = element tag { text }

      hgparent = element parent {hgparent.attlist, text}

      hgparent.attlist =

          attribute revision {xsd:integer {minInclusive = "-1"} }

        & attribute node {node.type}

      author = element author { author.attlist, text }

      author.attlist =

          attribute email {text}

      date = element date {xsd:dateTime}

      msg = element msg {msg.attlist, text}

      msg.attlist =

          attribute xml:space {"preserve"}

      paths = element paths { path* }

      path = element path { path.attlist, text }

      path.attlist =

          # Action: (A)dd, (M)odify, (R)emove

          attribute action {"A"|"M"|"R"}

      copies = element copies { copy+ }

      copy = element copy { copy.attlist, text }

      copy.attlist =

          attribute source {text}

      extra = element extra {extra.attlist, text}

      extra.attlist =

          attribute key {text}

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				# RelaxNG schema for "xml" log style
				# Inspired by Subversion's XML log format.

				start = log
				node.type = xsd:string {minLength = "40" maxLength = "40"}

				log = element log { logentry+ }
				logentry = element logentry {
				logentry.attlist,
				branch, tag, hgparent*,
				author, date,
				msg, paths?, copies?, extra*
				}
				logentry.attlist =
				attribute revision {xsd:nonNegativeInteger}
				& attribute node {node.type}
				branch = element branch { text }
				tag = element tag { text }
				hgparent = element parent {hgparent.attlist, text}
				hgparent.attlist =
				attribute revision {xsd:integer {minInclusive = "-1"} }
				& attribute node {node.type}
				author = element author { author.attlist, text }
				author.attlist =
				attribute email {text}
				date = element date {xsd:dateTime}
				msg = element msg {msg.attlist, text}
				msg.attlist =
				attribute xml:space {"preserve"}
				paths = element paths { path* }
				path = element path { path.attlist, text }
				path.attlist =
				# Action: (A)dd, (M)odify, (R)emove
				attribute action {"A"\|"M"\|"R"}
				copies = element copies { copy+ }
				copy = element copy { copy.attlist, text }
				copy.attlist =
				attribute source {text}
				extra = element extra {extra.attlist, text}
				extra.attlist =
				attribute key {text}