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module lang::diff::unified::UnifiedDiff

rascal-0.34.0

Syntax definition for Unified Diff format (see http://en.wikipedia.org/wiki/Diff_utility#Unified_format)

Usage​

import lang::diff::unified::UnifiedDiff;

syntax Diff​

syntax Diff
  = Header old Header new Chunk* chunks
  ;

syntax Chunk​

syntax Chunk
  = ChunkStart Line+
  ;

syntax ChunkStart​

syntax ChunkStart
  = ^ "@@ -" Range " +" Range " @@" Content
  ;

syntax Header​

syntax Header
  = ^ Indicator " " FileName DateTime?  "\n"
  ;

syntax DateTime​

syntax DateTime
  = "\t" Date date " " Time time " " TimeZone timeZone
  ;

syntax FileName​

lexical FileName
  = ![\t\n]* 
  ;

syntax Indicator​

syntax Indicator
  = old: "---" 
  | new: "+++"
  ;

syntax Date​

syntax Date
  = Year year "-" Month month "-" Day day
  ;

syntax Time​

syntax Time
  = Hours hours ":" Minutes minutes ":" Seconds seconds [0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]
  ;

syntax Year​

lexical Year = [0-9][0-9][0-9][0-9];

syntax Month​

lexical Month = [0-1][0-9];

syntax Day​

lexical Day = [0-1][0-9];

syntax Hours​

lexical Hours = [0-2][0-9];

syntax Minutes​

lexical Minutes = [0-6][0-9];

syntax Seconds​

lexical Seconds = [0-6][0-9];

syntax TimeZone​

syntax TimeZone
  = Sign sign Hours hours Minutes minutes 
  ;

syntax Sign​

lexical Sign = [+\-];

syntax Range​

syntax Range
  = Decimal begin // chunksize = 1
  | Decimal begin "," Decimal size
  ;

syntax Decimal​

lexical Decimal
  = [0-9]+ !>> [0-9]
  ;

syntax Line​

syntax Line
  = common: ^ " " Content content 
  | onlyOld: ^ "-" Content content
  | onlyNew: ^ "+" Content content
  | noNewLine: ^"\\ No newline at end of file\n"
  ;

syntax Content​

lexical Content
  = ![\n]* [\n]
  ;