122 lines
5.0 KiB
Plaintext
122 lines
5.0 KiB
Plaintext
#..
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This File contains rules for making rules and macros and some helper functions to make
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that easier.
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# Rule to make rules:
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lua> ".."
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|nomsu:defmacro("rule %signature = %body", (function(nomsu, vars)
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| local signature = nomsu:get_stubs(nomsu:typecheck(vars, "signature", "List").value);
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| local body = nomsu:typecheck(vars, "body", "Thunk");
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| return ([[
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|nomsu:def(%s, %s, %s)
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|]]):format(nomsu:repr(signature), nomsu:tree_to_lua(body), nomsu:repr(body.src)), nil;
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|end), "<source can be found in lib/metaprogramming.nom>");
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# Rule to make nomsu macros:
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rule [escaped parse %shorthand as %longhand] =:
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lua> ".."
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|local aliases = nomsu:get_stubs(nomsu:typecheck(vars, "shorthand", "List").value);
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|local template = nomsu:typecheck(vars, "longhand", "Thunk").value;
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|local function parsing_as(nomsu, vars)
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# Single expression/statement
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| if #template == 1 then;
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| local replacement = nomsu:replaced_vars(template[1], vars);
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| return nomsu:tree_to_lua(replacement);
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| end
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# Multiple statements
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| local lua_bits = {};
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| for _,bit in ipairs(template) do;
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| bit = nomsu:replaced_vars(bit, vars);
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| local expr, statement = nomsu:tree_to_lua(bit);
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| if statement then; table.insert(lua_bits, statement); end;
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| if expr then; table.insert(lua_bits, "ret = "..expr..";"); end;
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| end;
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| return nil, table.concat(lua_bits, "\\n");
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|end;
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|nomsu:defmacro(aliases, parsing_as, template.src);
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escaped parse \[parse %shorthand as %longhand] as \: escaped parse \%shorthand as \%longhand
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# Rule to make lua macros:
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rule [escaped compile %macro_def to %body] =:
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lua> ".."
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|local aliases = nomsu:get_stubs(nomsu:typecheck(vars, "macro_def", "List").value);
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|local body = nomsu:typecheck(vars, "body", "Thunk");
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|local thunk = nomsu:tree_to_value(body);
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|nomsu:defmacro(aliases, thunk, body.src);
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rule [escaped compile %macro_def to code %body] =:
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lua> ".."
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|local aliases = nomsu:get_stubs(nomsu:typecheck(vars, "macro_def", "List").value);
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|local body = nomsu:typecheck(vars, "body", "Thunk");
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|local thunk = nomsu:tree_to_value(body);
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|local thunk_wrapper = function(nomsu, vars) return nil, thunk(nomsu, vars); end;
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|nomsu:defmacro(aliases, thunk_wrapper, body.src);
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parse [compile %macro_def to %body] as: escaped compile \%macro_def to \%body
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parse [compile %macro_def to code %body] as: escaped compile \%macro_def to code \%body
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rule [do %] =:
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=lua "\(%)(nomsu, vars)"
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rule [%tree as lua] =:
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=lua "nomsu:tree_to_lua(\(%tree))"
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rule [%tree as value] =:
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=lua "nomsu:tree_to_value(\(%tree), vars)"
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compile [repr %obj] to:
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"nomsu:repr(\(%obj as lua))"
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compile [type %obj, type of %obj] to:
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"type(\(%obj as lua))"
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parse [lua do> %block] as:
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lua> "do;"
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lua> %block
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lua> "end;"
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rule [%tree as lua statement] =:
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lua do> ".."
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|local _,statement = nomsu:tree_to_lua(\(%tree));
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|return statement;
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rule [%tree as lua statements] =:
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lua do> ".."
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|local lua_bits = {};
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|local statements = nomsu:typecheck(vars, "tree", "Thunk").value;
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|for _,bit in ipairs(statements) do;
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| local expr, statement = nomsu:tree_to_lua(bit);
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| if statement then; table.insert(lua_bits, statement); end;
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| if expr then; table.insert(lua_bits, "ret = "..expr..";"); end;
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|end;
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|return table.concat(lua_bits, "\\n");
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compile [nomsu] to: "nomsu"
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compile [nomsu's %key] to: "nomsu[\(%key as lua)]"
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compile [nomsu %method %args] to: "nomsu[\(%method as lua)](nomsu, unpack(\(%args as lua)))"
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# Get the source code for a function
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rule [help %rule] =:
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lua do> ".."
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|local fn_def = nomsu.defs[nomsu:get_stub(vars.rule)]
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|if not fn_def then;
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| nomsu:writeln("Rule not found: "..nomsu:repr(vars.rule));
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|else;
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| local template = fn_def.is_macro and "compile %s to%s" or "rule %s =%s";
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| local src = fn_def.src or ":\\n <unknown source code>";
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| if src:sub(1,1) ~= ":" and fn_def.is_macro then; template = "parse %s as: %s"; end;
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| nomsu:writeln(template:format(nomsu:repr(fn_def.stub), src));
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|end;
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# Compiler tools
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parse [eval %code, run %code] as: nomsu "run" [%code]
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rule [source code from tree %tree] =:
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lua do> ".."
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|local _,_,leading_space = vars.tree.src:find("\\n(%s*)%S");
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|if leading_space then;
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| local chunk1, chunk2 = vars.tree.src:match(":%s*([^\\n]*)(\\n.*)");
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| chunk2 = chunk2:gsub("\\n"..leading_space, "\\n");
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| return chunk1..chunk2.."\\n";
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|else;
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| return vars.tree.src:match(":%s*(%S.*)").."\\n";
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|end;
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parse [source code %body] as: source code from tree \%body
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parse [parse tree %code] as: nomsu "tree_to_str" [\%code]
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parse [enable debugging] as: lua> "nomsu.debug = true"
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parse [disable debugging] as: lua> "nomsu.debug = false"
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