Stream parsing operators

A range of operators used for stream parsing of textual/numerical data—most usually a not's $Text):

Such operators are:

• fail()
• failed()
• Stream.captureJSON
• Stream.captureLine[("targetAttribute")]
• Stream.captureNumber[("targetAttribute")]
• Stream.captureRest[("targetAttribute")]
• Stream.captureTo("matchString"[,"targetAttribute"])
• Stream.captureToken[("targetAttribute")]
• Stream.captureWord[("targetAttribute")]
• Stream.captureXML
• Stream.eachLine(LoopVar[:condition]){action}
• Stream.expect("matchString")
• Stream.expectNumber
• Stream.expectWhitespace
• Stream.expectWord
• Stream.failed
• Stream.json.each{action}
• Stream.json["key"]
• Stream.json[N]
• Stream.skip(N)
• Stream.skipTo("matchString")
• Stream.skipToNumber
• Stream.skipWhitespace
• Stream.try{action}[.thenTry{action}]
• Stream.xml.each(path){action}
• Stream.xml(path)