From 39119ad8ecd00a9c19fb173c78cb4a8d22a4540a Mon Sep 17 00:00:00 2001
From: Tao Bao <tbao@google.com>
Date: Mon, 10 Oct 2016 22:52:18 -0700
Subject: edify: Some clean-ups to libedify.

- Remove dead declarations in expr.h: SetError(), GetError(),
  ClearError().
- Remove the declaration of Build() out of expr.h.
- Use std::unordered_map to implement RegisterFunction() and
  FindFunction(); kill FinishRegistration().
- Add a testcase for calling unknown functions.

Test: mmma bootable/recovery; recovery_component_test passes.
Change-Id: I9af6825ae677f92b22d716a4a5682f58522af03b
---
 edify/README | 108 -----------------------------------------------------------
 1 file changed, 108 deletions(-)
 delete mode 100644 edify/README

(limited to 'edify/README')

diff --git a/edify/README b/edify/README
deleted file mode 100644
index 810455cca..000000000
--- a/edify/README
+++ /dev/null
@@ -1,108 +0,0 @@
-Update scripts (from donut onwards) are written in a new little
-scripting language ("edify") that is superficially somewhat similar to
-the old one ("amend").  This is a brief overview of the new language.
-
-- The entire script is a single expression.
-
-- All expressions are string-valued.
-
-- String literals appear in double quotes.  \n, \t, \", and \\ are
-  understood, as are hexadecimal escapes like \x4a.
-
-- String literals consisting of only letters, numbers, colons,
-  underscores, slashes, and periods don't need to be in double quotes.
-
-- The following words are reserved:
-
-       if    then    else   endif
-
-  They have special meaning when unquoted.  (In quotes, they are just
-  string literals.)
-
-- When used as a boolean, the empty string is "false" and all other
-  strings are "true".
-
-- All functions are actually macros (in the Lisp sense); the body of
-  the function can control which (if any) of the arguments are
-  evaluated.  This means that functions can act as control
-  structures.
-
-- Operators (like "&&" and "||") are just syntactic sugar for builtin
-  functions, so they can act as control structures as well.
-
-- ";" is a binary operator; evaluating it just means to first evaluate
-  the left side, then the right.  It can also appear after any
-  expression.
-
-- Comments start with "#" and run to the end of the line.
-
-
-
-Some examples:
-
-- There's no distinction between quoted and unquoted strings; the
-  quotes are only needed if you want characters like whitespace to
-  appear in the string.  The following expressions all evaluate to the
-  same string.
-
-     "a b"
-     a + " " + b
-     "a" + " " + "b"
-     "a\x20b"
-     a + "\x20b"
-     concat(a, " ", "b")
-     "concat"(a, " ", "b")
-
-  As shown in the last example, function names are just strings,
-  too.  They must be string *literals*, however.  This is not legal:
-
-     ("con" + "cat")(a, " ", b)         # syntax error!
-
-
-- The ifelse() builtin takes three arguments:  it evaluates exactly
-  one of the second and third, depending on whether the first one is
-  true.  There is also some syntactic sugar to make expressions that
-  look like if/else statements:
-
-     # these are all equivalent
-     ifelse(something(), "yes", "no")
-     if something() then yes else no endif
-     if something() then "yes" else "no" endif
-
-  The else part is optional.
-
-     if something() then "yes" endif    # if something() is false,
-                                        # evaluates to false
-
-     ifelse(condition(), "", abort())   # abort() only called if
-                                        # condition() is false
-
-  The last example is equivalent to:
-
-     assert(condition())
-
-
-- The && and || operators can be used similarly; they evaluate their
-  second argument only if it's needed to determine the truth of the
-  expression.  Their value is the value of the last-evaluated
-  argument:
-
-     file_exists("/data/system/bad") && delete("/data/system/bad")
-
-     file_exists("/data/system/missing") || create("/data/system/missing")
-
-     get_it() || "xxx"     # returns value of get_it() if that value is
-                           # true, otherwise returns "xxx"
-
-
-- The purpose of ";" is to simulate imperative statements, of course,
-  but the operator can be used anywhere.  Its value is the value of
-  its right side:
-
-     concat(a;b;c, d, e;f)     # evaluates to "cdf"
-
-  A more useful example might be something like:
-
-     ifelse(condition(),
-            (first_step(); second_step();),   # second ; is optional
-            alternative_procedure())
-- 
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