137 lines
5.1 KiB
Plaintext
137 lines
5.1 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 = {};
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for i, alias in ipairs(nomsu:typecheck(vars, "signature", "List").value) do
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signature[i] = alias.src;
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end
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local body = nomsu:typecheck(vars, "body", "Thunk");
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local src = nomsu:source_code(0);
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return nil, ([[
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nomsu:def(%s, %s, %s)
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]]):format(nomsu:repr(signature), nomsu:tree_to_lua(body), nomsu:repr(nomsu:dedent(src)));
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end), \(__src__ 1));
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# Rule to make lua macros:
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rule [compile \%macro_def to \%body] =:
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lua> ".."
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local signature = {};
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for i, alias in ipairs(nomsu:typecheck(vars, "macro_def", "List").value) do
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signature[i] = alias.src;
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end
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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(signature, thunk, ("compile %s\\n..to %s"):format(vars.macro_def.src, body.src));
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rule [compile \%macro_def to code \%body] =:
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lua> ".."
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local signature = {};
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for i, alias in ipairs(nomsu:typecheck(vars, "macro_def", "List").value) do
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signature[i] = alias.src;
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end
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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(signature, thunk_wrapper, ("compile %s\\n..to code %s"):format(vars.macro_def.src, body.src));
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# Rule to make nomsu macros:
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lua> ".."
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nomsu:defmacro("parse %shorthand as %longhand", (function(nomsu, vars)
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local signature = {};
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for i, alias in ipairs(nomsu:typecheck(vars, "shorthand", "List").value) do
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signature[i] = alias.src;
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end
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local template = {};
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for i, line in ipairs(nomsu:typecheck(vars, "longhand", "Thunk").value) do
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template[i] = nomsu:dedent(line.src);
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end
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signature, template = nomsu:repr(signature), nomsu:repr(table.concat(template, "\\n"));
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return nil, ([[
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nomsu:defmacro(%s, (function(nomsu, vars)
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local template = nomsu:parse(%s, %s);
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if #template.value == 1 then template = template.value[1]; end
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local replacement = nomsu:replaced_vars(template, vars);
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return nomsu:tree_to_lua(replacement);
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end), %s)]]):format(signature, template, nomsu:repr(vars.shorthand.line_no), nomsu:repr(nomsu:source_code(0)));
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end), \(__src__ 1));
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rule [remove rule %stub] =:
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lua> ".."
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local def = nomsu.defs[\(%stub)];
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for _, alias in ipairs(def.aliases) do
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nomsu.defs[alias] = false;
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end
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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 [indented %obj] to:
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"nomsu:indent(\(%obj as lua))"
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compile [dedented %obj] to:
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"nomsu:dedent(\(%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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parse [rule %signature] as:
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(nomsu's "defs")->(nomsu "get_stub" [\%signature])
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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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nomsu:writeln(fn_def.src or "<unknown source code>");
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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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