| Author |
Message |
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| etxuwig at etxb.ericsson. |
 Posted: Mon Feb 24, 2003 6:29 pm |
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Guest
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I've attached a diff to file.erl in kernel-2.8.1 that adds
the following functions for evaluating scripts (and being
able to capture a return value -- something file:eval/1 will
not let you do.)
/Uffe
script(File) ->
{ok, ReturnValue} | {error, Reason}
evaluates the expressions in File. Returns the result of
the last expression. The expressions can create bindings
to be reused in following expressions, just like in the
Erlang shell.
script(File, Bindings) ->
{ok, ReturnValue} | {error, Reason}
Like script/1, but with predefined bindings. Use the
functions in erl_eval.erl to manage bindings.
path_script(Path, File [, Bindings]) ->
{ok, ReturnValue, Fullname} | {error, Reason}
Analogous to path_eval/2, but for script/[2,3] above.
Example, using two "script" files:
eval1.txt:
----------
Cwd = fun() ->
{ok,D} = file:get_cwd(),
D
end,
[{cwd, Cwd()}].
eval2.txt: (assuming that the variable Var is bound)
----------
Cwd = fun() ->
{ok,D} = file:get_cwd(),
D
end,
[{var, Var},
{cwd, Cwd()}].
erl -boot start_clean -pa ../ebin -nostick
Erlang (BEAM) emulator version 5.2.3.1 [hipe] [threads:0]
Eshell V5.2.3.1 (abort with ^G)
1> file:script("eval1.txt").
{ok,[{cwd,"/home/etxuwig/work/erlang/open_source/contribs/mine/not_ready/builder-0.5/src"}]}
2> file:script("eval2.txt").
{error,[{7,file,{{unbound,'Var'},[{erl_eval,expr,3}]}},
{error,undefined_script}]}
3>
file:script("eval2.txt",erl_eval:add_binding('Var',the_value,erl_eval:new_bindings())).
{ok,[{var,the_value},
{cwd,"/home/etxuwig/work/erlang/open_source/contribs/mine/not_ready/builder-0.5/src"}]}
4>
--
Ulf Wiger, Senior Specialist,
/ / / Architecture & Design of Carrier-Class Software
/ / / Strategic Product & System Management
/ / / Ericsson AB, Connectivity and Control Nodes
Post generated using Mail2Forum (http://m2f.sourceforge.net) |
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| cheung |
| Posted: Tue Feb 21, 2012 3:31 am |
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| wuji |
| Posted: Mon Sep 10, 2012 9:09 am |
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User
Joined: 10 Aug 2012
Posts: 654
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