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\name{languageEl}
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\name{languageEl}
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\alias{languageEl}
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\alias{languageEl}
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\alias{languageEl<-}
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\alias{languageEl<-}
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\alias{isGrammarSymbol}
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\alias{isGrammarSymbol}
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\title{Elements of Language Objects}
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\title{Elements of Language Objects}
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\description{
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  Internal routines to support some operations on language objects.
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}
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\usage{
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\usage{
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languageEl(object, which)
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languageEl(object, which)
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isGrammarSymbol(symbol)
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isGrammarSymbol(symbol)
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}
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}
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\description{
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  Internal routines to support some operations on language objects.
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}
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\section{Summary of Functions}{
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\section{Summary of Functions}{
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\describe{
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  \describe{
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  \item{\code{languageEl}:}{
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    \item{\code{languageEl}:}{
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  extract an element of a language object, consistently
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      extract an element of a language object, consistently for
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for different kinds of objects.
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      different kinds of objects.
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The 1st., etc. elements of a function are the corresponding
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      The 1st., etc. elements of a function are the corresponding formal
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formal arguments, with the default expression if any as value.
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      arguments, with the default expression if any as value.
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The first element of a call is the name or the function object being
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      The first element of a call is the name or the function object
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called.
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      being called.
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  The 2nd, 3rd, etc. elements are the 1st, 2nd, etc. arguments expressions.
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      The 2nd, 3rd, etc. elements are the 1st, 2nd, etc. arguments
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Note that the form of the extracted name is different for R and S-Plus.
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      expressions.  Note that the form of the extracted name is
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      different for R and S-Plus.  When the name (the first element) of
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When the name (the first element) of a call is replaced, the languageEl replacement
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      a call is replaced, the languageEl replacement function coerces a
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function coerces a character string to the internal form for each system.
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      character string to the internal form for each system.
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The 1st, 2nd, 3rd elements of an \code{if} expression are the test, first, and second branch.
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      The 1st, 2nd, 3rd elements of an \code{if} expression are the
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      test, first, and second branch.
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The 1st element of a \code{for} object is the name (symbol) being used in the loop,
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      The 1st element of a \code{for} object is the name (symbol) being
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      used in the loop, the second is the expression for the range of
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the second is the expression for the range of the loop, the third is the body of the loop.
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      the loop, the third is the body of the loop.
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The first element of a \code{while} object is the loop test, and the second the body of
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      The first element of a \code{while} object is the loop test, and
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      the second the body of the loop.
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the loop.
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    }
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}
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    \item{\code{isGrammarSymbol}:}{
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\item{isGrammarSymbol:}{Checks whether the symbol is part of the
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      Checks whether the symbol is part of the grammar.
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    grammar.  Don't use this function directly.}
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      Don't use this function directly.
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    }
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}
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  }
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}
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}
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\keyword{internal}
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\keyword{internal}