Removed algorithm.md; it has been added to spec as appendix.

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-Algorithm for parsing nested links, images, emphasis, and quotes
-================================================================
-
-When we're parsing inlines and we hit
-
-- a run of `*` or `_` characters
-- a `[` or `![`
-
-we insert a text node with the literal content, and add a pointer
-to this text node to the **delimiter stack.**
-
-The **delimiter stack** is a doubly linked list.  Each
-element contains a pointer to a text node, plus information about
-
-- the type of delimiter (`[`, `![`, `*`, `_`)
-- the number of delimiters,
-- whether the delimiter is "active" (all are active to start), and
-- whether the delimiter is a potential opener, a potential closer,
-  or both.
-
-When we hit a `]` character, we call the `look_for_link_or_image`
-procedure (see below).
-
-When we hit the end of the input, we call the `process_emphasis`
-procedure (see below), with `stack_bottom` = NULL.
-
-`look_for_link_or_image`
-------------------------
-
-Starting at the top of the delimiter stack, we look backwards
-through the stack for a `[` or `![` delimiter.
-
-If we don't find one, we return a literal text node `]`.
-
-If we do find one, but it's not *active*, we remove the inactive
-delimiter from the stack, and return a literal text node `]`.
-
-If we find one and it's active, then we parse ahead to see if
-we have an inline link/image, reference link/image, compact reference
-link/image, or shortcut reference link/image.
-
-If we don't, then we remove the `[` or `![` delimiter from the
-delimiter stack and return a literal text node `]`.
-
-If we do, then
-
-- We return a link or image node whose children are the inlines
-  after the text node pointed to by the opening delimiter.
-
-- We run `process_emphasis` on these inlines, with the `[` opener
-  as `stack_bottom`.
-
-- We remove the opening delimiter.
-
-- If we have a link (and not an image), we also set all
-  `[` delimiters before the opening delimiter to *inactive*.  (This
-  will prevent us from getting links within links.)
-
-
-`process_emphasis`
-------------------
-
-Parameter `stack_bottom` sets a lower bound to how far we
-descend in the **delimiter stack**.  If it is NULL, we can
-go all the way to the bottom.  Otherwise, we stop before
-visiting `stack_bottom`.
-
-Let `current_position` point to the element on the delimiter
-just above `stack_bottom` (or the first element if `stack_bottom`
-is NULL).
-
-We keep track of the `openers_bottom` for each delimiter
-type (`*`, `_`).  Initialize this to `stack_bottom`.
-
-Then we repeat the following until we run out of potential
-closers:
-
-- Move `current_position` forward in the delimiter stack (if needed)
-  until we find the first potential closer with delimiter `*` or `_`.
-  (This will be the potential closer closest
-  to the beginning of the input -- the first one in parse order.)
-
-- Now, look back in the stack (staying above `stack_bottom` and
-  the `openers_bottom` for this delimiter type) for the
-  first matching potential opener ("matching" means same delimiter).
-
-- If one is found:
-
-  - Figure out whether we have emphasis or strong emphasis:
-    if both closer and opener spans have length >= 2, we have
-    strong, otherwise regular.
-  - Insert an emph or strong emph node accordingly, after
-    the text node corresponding to the opener.
-  - Remove delimiters between opener and closer from the delimiter
-    stack.
-  - Remove 1 (for regular emph) or 2 (for strong emph) delimiters
-    from the opening and closing text nodes.  If they become empty
-    as a result, remove them and remove the corresponding element
-    of the delimiter stack.  If the closing node is removed, reset
-    `current_position` to the next element in the stack.
-
-- If none in found:
-
-  - Set `openers_bottom` to the element before `current_position`.
-    (We know that there are no openers for this kind of closer up to and
-    including this point, so this puts a lower bound on future searches.)
-  - If the closer at `current_position` is not a potential opener,
-    remove it from the delimiter stack (since we know it can't
-    be a closer either).
-  - Advance `current_position` to the next element in the stack.
-
-- Repeat.
-
-- After we're done, remove all delimiters above `stack_bottom` from the
-  delimiter stack.
-