Fix lazy evaluation of second argument to append-pipes for consistency with make-pipe; fixes mappend-pipe laziness

Ignore-this: f3fed201712877e374d820d195f79ce1

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"oops"

darcs-hash:124414697b6eca4a749814989db32489946b1315

Fixed xnum parsing / unparsing.
Fixed comparison operators.
Added lang() function.
Node sets returned by EVALUATE and EVALUATE-COMPILED now are automatically sorted
using document order by default.
Fixed following:: axis (again).
Fixed NODE-TEST-NAME for namespace nodes.
Numbers in XPath expressions are now never parsed into SINGLE-FLOAT.
Added SORT-NODE-SET function.

darcs-hash:f11136c9917dee6bd41d96f3e8950db389c78b55

Added atdoc documentation templates (mostly copied from Xuriella).
Renamed xpath-protocol:string-value to xpath-protocol:node-text.
Added xpath-protocol:node-text method for namespace nodes.
Added list->node-set function (a simpler version of xpath-sys:make-node-set).

darcs-hash:5157e09c5e43012d65211d1fb22d6b544a75ee54

Fixed :following, :preceding-sibling, :following-sibling and :namespace axes.
Fixed contains() (what a shame! I made a mistake in the order of arguments).
Fixed translate().
Added get-node-id() and plx:generate-id() (same as generate-id() in XSLT).
Added checks for number of arguments passed to XPath functions.
Fixed a package-related problem in define-xpath-function/single-type.
Fixed xnum-round.

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Switched to dynamic bindings.
Fixed "names" of character-data nodes.

darcs-hash:24a16eac985183f1bfd66894f0c3c94a001e5f57

Added id(), namespace-uri(), floor(), round(), ceiling().
Added xpath-protocol:get-element-by-id and its implementation for DOM.
Added *dom-builder* and *document-element* in xpath-test.lisp so that it's
now possible to run unit tests for other document representations.

darcs-hash:27372b9c5e8d77100eb75ccffe3cc070893a2de3

darcs-hash:9dd87a2a69312e0beb21c574842c778200709655

Always require the second argument to COMPILE-XPATH.  We cannot see lexical
bindings in this function.

Replaced the function EVALUATE with EVALUATE-THUNK, which always takes a
closure as an argument, never a string or sexp.  (EVALUATE-THUNK is just
a working title for this function, perhaps a better name can be found.)

New macro EVALUATE, replacing the compiler macro.

Removed *LEXICAL-NAMESPACES* and *LEXICAL-VARIABLES*.
  - don't bind *LEXICAL-NAMESPACES* in WITH-NAMESPACES
  - don't bind *LEXICAL-VARIABLES* in WITH-VARIABLES

Export EVALUATE-THUNK from the package in addition to EVALUATE.

Added a test checking that the empty namespace can be used without
having to use WITH-NAMESPACES.

Removed the call to STRING in TEST-FILTERING.  (fixme?)

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Fixed:
  map-node-set
  do-node-set

Added node set iterators:
  make-node-set-iterator
  node-set-iterator-end-p
  node-set-iterator-next
  node-set-iterator-current

Exported:
  node-set-p

Added test for empty node sets:
  node-set-empty-p

darcs-hash:9e84b4035564a382ee3af2e16316bd1bb8854ab8

  Reverted CONTEXT-VARIABLE-VALUE.

  Renamed ENVIRONMENT-VALIDATE-VARIABLE to ENVIRONMENT-FIND-VARIABLE,
  which now returns a closure rather than just a boolean.

  New exported macro WITH-VARIABLES for the LEXICAL-ENVIRONMENT.
  (And tests for that.)

darcs-hash:4bf3773ca6bd46e449833192b823a08f248a9175

Moved XPath parser to parser.lisp.

Moved some of toplevel API to api.lisp.

Added MAP-NODE-SET and DO-NODE-SET.

Added proper unary minus handling.

Added test cases for string representation of XPath in TEST-XPATH
(previously TEST-XPATH/UNABBREVIATED).

Made it possible to pass strings to compile-xpath.
STRING-VALUE, NUMBER-VALUE, BOOLEAN-VALUE and NODE-SET-VALUE now can handle single nodes.
Added XPATH-PROTOCOL:NODE-P.

Compiler macro for EVALUATE now issues warning instead of error if EVALUATE
is used outside lexical scope of (WITH-NAMESPACES (...) ...)

Added some of missing XPath functions - substring(), true(), false(),
boolean(), number()

darcs-hash:973601a675f33d9ebcd85ef89b6270e702fbaa1d

A new function EVALUATE is provided that...
  - automatically parses XPath strings.
  - also accepts sexps in the syntax (xpath (sexp-goes-here)).  (The special
    marker XPATH in the CAR is needed to distinguish literal strings from XPath
    strings.)
  - and accepts pre-compiled closures.  Users who want to use this function
    with a customized environment must pass precompiled closures.

For the first two cases, the environment is defined lexically using the
new macro WITH-NAMESPACES.

The context argument to ALL-NODES can be either...
  - an actual context
  - or any other node understood by the XPath protocol, and will then
    be turned into a trivial context automatically

A compiler macro on EVALUATE allows pre-compilation of closures at fasl
load time.  (Macrolet tricks propagate the information from WITH-NAMESPACES
into the compiler macro.  Thanks to chandler on #lisp for the tip.)

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