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NAME

       erl_recomment - Inserting comments into abstract Erlang syntax trees.

DESCRIPTION

       Inserting comments into abstract Erlang syntax trees

       This  module contains functions for inserting comments, described by position, indentation
       and text, as attachments on an abstract syntax tree, at the correct places.

EXPORTS

       quick_recomment_forms(Tree::Forms, Comments::[Comment]) -> syntaxTree()

              Types:

                 Forms = syntaxTree() | [syntaxTree()]
                 Comment = {Line, Column, Indentation, Text}
                 Line = integer()
                 Column = integer()
                 Indentation = integer()
                 Text = [string()]

              Like recomment_forms/2,  but  only  inserts  top-level  comments.  Comments  within
              function definitions or declarations ("forms") are simply ignored.

       recomment_forms(Tree::Forms, Comments::[Comment]) -> syntaxTree()

              Types:

                 syntaxTree() (see module erl_syntax)
                 Forms = syntaxTree() | [syntaxTree()]
                 Comment = {Line, Column, Indentation, Text}
                 Line = integer()
                 Column = integer()
                 Indentation = integer()
                 Text = [string()]

              Attaches  comments to the syntax tree/trees representing a program. The given Forms
              should be a single syntax tree of  type  form_list,  or  a  list  of  syntax  trees
              representing  "program  forms".  The  syntax  trees  must  contain  valid  position
              information (for details, see recomment_tree/2).  The  result  is  a  corresponding
              syntax  tree of type form_list in which all comments in the list Comments have been
              attached at the proper places.

              Assuming Forms represents a program (or  any  sequence  of  "program  forms"),  any
              comments whose first lines are not directly associated with a specific program form
              will become standalone comments inserted between the  neighbouring  program  forms.
              Furthermore,  comments  whose column position is less than or equal to one will not
              be attached to a program form that begins at a conflicting line  number  (this  can
              happen with preprocessor-generated line-attributes).

              If  Forms  is a syntax tree of some other type than form_list, the comments will be
              inserted directly using recomment_tree/2, and any  comments  left  over  from  that
              process are added as postcomments on the result.

              Entries in Comments represent multi-line comments. For each entry, Line is the line
              number and Column the left column of the comment (the column of the first  comment-
              introducing  "%"  character).  Indentation  is  the  number  of character positions
              between the last non-whitespace character before the comment (or the  left  margin)
              and  the  left  column  of  the comment. Text is a list of strings representing the
              consecutive comment lines  in  top-down  order,  where  each  string  contains  all
              characters following (but not including) the comment-introducing "%" and up to (but
              not including) the terminating newline. (Cf. module erl_comment_scan.)

              Evaluation exits  with  reason  {bad_position,  Pos}  if  the  associated  position
              information  Pos  of some subtree in the input does not have a recognizable format,
              or with reason {bad_tree, L, C} if insertion of a comment  at  line  L,  column  C,
              fails because the tree structure is ill-formed.

              See also: erl_comment_scan, quick_recomment_forms/2, recomment_tree/2.

       recomment_tree(Tree::syntaxTree(), Comments::[Comment]) -> {syntaxTree(), [Comment]}

              Types:

                 Comment = {Line, Column, Indentation, Text}
                 Line = integer()
                 Column = integer()
                 Indentation = integer()
                 Text = [string()]

              Attaches comments to a syntax tree. The result is a pair {NewTree, Remainder} where
              NewTree is the given Tree where comments from the list Comments have been  attached
              at  the  proper places. Remainder is the list of entries in Comments which have not
              been inserted, because their line numbers are greater than those of any node in the
              tree.  The  entries  in  Comments  are  inserted  in  order; if two comments become
              attached to the same node, they will appear in the same order in the program text.

              The nodes of the syntax tree must contain valid position information. This  can  be
              single  integers,  assumed  to represent a line number, or 2- or 3-tuples where the
              first or second element is an integer, in which case the leftmost  integer  element
              is  assumed  to  represent  the line number. Line numbers less than one are ignored
              (usually, the default line number for newly created nodes is zero).

              For details on the Line, Column and Indentation fields, and the behaviour  in  case
              of errors, see recomment_forms/2.

              See also: recomment_forms/2.

AUTHORS

       Richard Carlsson <richardc@it.uu.se>

                                       syntax_tools 1.6.7.1                   erl_recomment(3erl)