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View Code? Open in Web Editor NEWNeat and tidy Erlang alternative syntax based on indentation rather than punctuation
License: MIT License
Neat and tidy Erlang alternative syntax based on indentation rather than punctuation
License: MIT License
neaterl Erlang alternative syntax based on indentation rather than punctuation Software authored by Walt Woods, project start date 6 June 2010 -INTERACTIVE SHELL- Make the neaterl module, make sure the binaries are in the erlang path (for instance, use "erl -pa ebin" if you're testing this out from the module's directory), and type the following in a standard erlang interpreter: 1> neaterl:shell(). N1> And the N1> prompt means you're now typing erlang code through neaterl! Statements execute by entering a blank line after you've entered all the lines you want evaluated. For example: N1> 1 + 1 N2> 2 N1> [ N2> 1 N3> 2 N4> 3 N5> [1,2,3] N1> The prompt numbering might continue going up at some point. However, at the moment its numbering is useful if you receive syntax errors, or for entering modules on the command line, like so: N1> -module(test) N2> -export(hi/0) N3> oops N2> -export([hi/0]) N3> N4> hi() -> N5> Name=io:get_line("Your Name? ") N6> io:format("Hello, ~s!~n", [ Name ]) N7> N8> {module,test} N1> test:hi() N2> Your Name? Walt Hello, Walt ! ok N1> Two things to note: 1. Two blank lines terminate a module definition. 2. The "oops" command means, "I made a typo and don't want to retype every line, please let me retype the last!" It can be executed as many times as you'd like, all the way back to N1> The two blank lines might change at some point, as modules entered in the shell probably are not very long, and don't really need blank lines for formatting. Typing "exit" or "quit" will leave the neaterl shell. N1> quit N2> (Back to regular erlang prompt) 2> -COMPILING .erln FILES- Create a file with a .erln extension, such as test.erln. Copy the following into it: %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% -module(test) -export([ hello_world/0, fac/1 ]) hello_world() -> io:format("Hello, World!~n", []) fac (0) -> 1 (N) when is_integer(N) and N > 0 -> N * fac(N - 1) %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Then, open up any erlang prompt, and run "neaterl:compile(test)" to generate the corresponding .beam file. If you'd like to load the module immediately to play with it, similar to the default shell's c() command, run "neaterl:load_file(test)" (Incomplete) If you want to have neaterl check the entries in your Emakefile for .erln source files, run "neaterl:make_all()" from a script or some such. -GETTING EQUIVALENT ERLANG CODE- neaterl exposes four functions: file/1, file/2, string/1, and string/2, that return the equivalent erlang code for the content of the file or string. Line numbers and indentation are preserved for the most part. -COOL POINTS- In addition to removing most statement termination symbols, neaterl changes the grammar such that line breaks and commas are relatively interchangable. All statements can either be inline (comma-separated) or indented (line-separated). For example, a long list could be written in neaterl as: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ] OR [ 1 2 3 4 5 6 7 8 9 10 Note that there's no closing bracket on the indented version - the indentation (or lack thereof) of the following statement implies that the previous structure is closed. Though a little odd at first, it really helps to remove a lot of the unnecessary punctuation. Compare with closing symbols: test() -> D = lists:map( fun(X) -> [ {hi,there} {yo,val} {eep, street} ] lists:seq(1,1000000) ) fprof:apply( {lists,map} [ fun(X) -> proplists:get_value(eep, X) D ] ) To without closing symbols: test() -> D = lists:map( fun(X) -> [ {hi, there} {yo, val} {eep, street} lists:seq(1,1000000) fprof:apply( {lists,map} [ fun(X) -> proplists:get_value(eep, X) D Omitting the closing symbols better subscribes to the idea that indentation is what delineates one statement from another. It also produces more succinct code. --and/or/andalso/orelse/,/;-- andalso, orelse, ',', and ';' have all been merged into 'and' and 'or'. The compiler will choose the appropriate symbol based on if the operator occurs in a guard expression or not. To see how these symbols translate, use the "keep_temp" option in neaterl's compilation. Note that, at present, there is no non-shortcircuiting version of these operators. --Functions With Multiple Matches-- Functions in neaterl only have their name once, followed by any number of body definitions, much like Erlang's anonymous function syntax. E.G.: fac (0) -> 1 (N) when is_integer(N) and N > 0 -> N * fac(N-1) Which helps to keep the bodies grouped together and makes a functional grouping more readily identifiable.
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