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@ -40,90 +40,90 @@ module Crisp |
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end |
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def func_of(env, binds, body) |
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-> (args : Array(Crisp::Type)) { |
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new_env = Crisp::Env.new(env, binds, args) |
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eval(body, new_env) |
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} as Crisp::Func |
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-> (args : Array(Crisp::Type)) { |
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new_env = Crisp::Env.new(env, binds, args) |
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eval(body, new_env) |
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} as Crisp::Func |
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end |
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def eval_ast(ast, env) |
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return ast.map{|n| eval(n, env) as Crisp::Type} if ast.is_a? Array |
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return ast.map{|n| eval(n, env) as Crisp::Type} if ast.is_a? Array |
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val = ast.unwrap |
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val = ast.unwrap |
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Crisp::Type.new case val |
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when Crisp::Symbol |
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Crisp::Type.new case val |
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when Crisp::Symbol |
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if e = env.get(val.str) |
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e |
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else |
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eval_error "'#{val.str}' not found" |
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Crisp.eval_error "'#{val.str}' not found" |
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end |
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when Crisp::List |
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when Crisp::List |
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val.each_with_object(Crisp::List.new){|n, l| l << eval(n, env)} |
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when Crisp::Vector |
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when Crisp::Vector |
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val.each_with_object(Crisp::Vector.new){|n, l| l << eval(n, env)} |
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when Crisp::HashMap |
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when Crisp::HashMap |
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new_map = Crisp::HashMap.new |
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val.each{|k, v| new_map[k] = eval(v, env)} |
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new_map |
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else |
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else |
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val |
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end |
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end |
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end |
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def read(str) |
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read_str str |
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read_str str |
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end |
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macro pair?(list) |
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{{list}}.is_a?(Array) && !{{list}}.empty? |
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{{list}}.is_a?(Array) && !{{list}}.empty? |
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end |
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def quasiquote(ast) |
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list = ast.unwrap |
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list = ast.unwrap |
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unless pair?(list) |
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return Crisp::Type.new( |
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Crisp::List.new << gen_type(Crisp::Symbol, "quote") << ast |
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) |
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end |
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unless pair?(list) |
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return Crisp::Type.new( |
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Crisp::List.new << gen_type(Crisp::Symbol, "quote") << ast |
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) |
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end |
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head = list.first.unwrap |
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head = list.first.unwrap |
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case |
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# ("unquote" ...) |
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when head.is_a?(Crisp::Symbol) && head.str == "unquote" |
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case |
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# ("unquote" ...) |
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when head.is_a?(Crisp::Symbol) && head.str == "unquote" |
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list[1] |
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# (("splice-unquote" ...) ...) |
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when pair?(head) && (arg0 = head.first.unwrap).is_a?(Crisp::Symbol) && arg0.str == "splice-unquote" |
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# (("splice-unquote" ...) ...) |
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when pair?(head) && (arg0 = head.first.unwrap).is_a?(Crisp::Symbol) && arg0.str == "splice-unquote" |
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tail = Crisp::Type.new list[1..-1].to_crisp_value |
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Crisp::Type.new( |
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Crisp::List.new << gen_type(Crisp::Symbol, "concat") << head[1] << quasiquote(tail) |
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Crisp::List.new << gen_type(Crisp::Symbol, "concat") << head[1] << quasiquote(tail) |
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) |
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else |
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else |
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tail = Crisp::Type.new list[1..-1].to_crisp_value |
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Crisp::Type.new( |
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Crisp::List.new << gen_type(Crisp::Symbol, "cons") << quasiquote(list.first) << quasiquote(tail) |
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Crisp::List.new << gen_type(Crisp::Symbol, "cons") << quasiquote(list.first) << quasiquote(tail) |
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) |
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end |
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end |
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end |
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def macro_call?(ast, env) |
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list = ast.unwrap |
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return false unless list.is_a? Crisp::List |
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return false if list.empty? |
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list = ast.unwrap |
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return false unless list.is_a? Crisp::List |
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return false if list.empty? |
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sym = list.first.unwrap |
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return false unless sym.is_a? Crisp::Symbol |
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sym = list.first.unwrap |
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return false unless sym.is_a? Crisp::Symbol |
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func = env.find(sym.str).try(&.data[sym.str]) |
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return false unless func && func.macro? |
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func = env.find(sym.str).try(&.data[sym.str]) |
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return false unless func && func.macro? |
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true |
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true |
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end |
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def macroexpand(ast, env) |
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while macro_call?(ast, env) |
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while macro_call?(ast, env) |
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# Already checked in macro_call? |
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list = ast.unwrap as Crisp::List |
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@ -132,41 +132,41 @@ module Crisp |
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case func |
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when Crisp::Func |
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ast = func.call(list[1..-1]) |
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ast = func.call(list[1..-1]) |
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when Crisp::Closure |
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ast = func.fn.call(list[1..-1]) |
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ast = func.fn.call(list[1..-1]) |
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else |
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eval_error "macro '#{func_sym.str}' must be function: #{ast}" |
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end |
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Crisp.eval_error "macro '#{func_sym.str}' must be function: #{ast}" |
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end |
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end |
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ast |
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ast |
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end |
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macro invoke_list(l, env) |
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f = eval({{l}}.first, {{env}}).unwrap |
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args = eval_ast({{l}}[1..-1], {{env}}) as Array |
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f = eval({{l}}.first, {{env}}).unwrap |
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args = eval_ast({{l}}[1..-1], {{env}}) as Array |
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case f |
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when Crisp::Closure |
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case f |
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when Crisp::Closure |
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ast = f.ast |
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{{env}} = Crisp::Env.new(f.env, f.params, args) |
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next # TCO |
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when Crisp::Func |
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when Crisp::Func |
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return f.call args |
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else |
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eval_error "expected function as the first argument: #{f}" |
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end |
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else |
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Crisp.eval_error "expected function as the first argument: #{f}" |
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end |
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end |
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def debug(ast) |
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puts print(ast).colorize.red |
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puts print(ast).colorize.red |
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end |
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def eval(ast, env) |
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# 'next' in 'do...end' has a bug in crystal 0.7.1 |
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# https://github.com/manastech/crystal/issues/659 |
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while true |
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# 'next' in 'do...end' has a bug in crystal 0.7.1 |
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# https://github.com/manastech/crystal/issues/659 |
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while true |
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return eval_ast(ast, env) unless ast.unwrap.is_a? Crisp::List |
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ast = macroexpand(ast, env) |
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@ -181,63 +181,63 @@ module Crisp |
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return invoke_list(list, env) unless head.is_a? Crisp::Symbol |
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return Crisp::Type.new case head.str |
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when "def!" |
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eval_error "wrong number of argument for 'def!'" unless list.size == 3 |
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when "def!" |
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Crisp.eval_error "wrong number of argument for 'def!'" unless list.size == 3 |
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a1 = list[1].unwrap |
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eval_error "1st argument of 'def!' must be symbol: #{a1}" unless a1.is_a? Crisp::Symbol |
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Crisp.eval_error "1st argument of 'def!' must be symbol: #{a1}" unless a1.is_a? Crisp::Symbol |
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env.set(a1.str, eval(list[2], env)) |
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when "let*" |
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eval_error "wrong number of argument for 'def!'" unless list.size == 3 |
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when "let*" |
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Crisp.eval_error "wrong number of argument for 'def!'" unless list.size == 3 |
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bindings = list[1].unwrap |
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eval_error "1st argument of 'let*' must be list or vector" unless bindings.is_a? Array |
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eval_error "size of binding list must be even" unless bindings.size.even? |
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Crisp.eval_error "1st argument of 'let*' must be list or vector" unless bindings.is_a? Array |
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Crisp.eval_error "size of binding list must be even" unless bindings.size.even? |
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new_env = Crisp::Env.new env |
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bindings.each_slice(2) do |binding| |
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key, value = binding |
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name = key.unwrap |
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eval_error "name of binding must be specified as symbol #{name}" unless name.is_a? Crisp::Symbol |
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new_env.set(name.str, eval(value, new_env)) |
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key, value = binding |
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name = key.unwrap |
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class="n">Crisp class="o">.eval_error "name of binding must be specified as symbol #{name}" unless name.is_a? Crisp::Symbol |
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new_env.set(name.str, eval(value, new_env)) |
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end |
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ast, env = list[2], new_env |
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next # TCO |
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when "do" |
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when "do" |
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if list.empty? |
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ast = Crisp::Type.new nil |
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next |
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ast = Crisp::Type.new nil |
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next |
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end |
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eval_ast(list[1..-2].to_crisp_value, env) |
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ast = list.last |
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next # TCO |
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when "if" |
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when "if" |
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ast = unless eval(list[1], env).unwrap |
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list.size >= 4 ? list[3] : Crisp::Type.new(nil) |
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list.size >= 4 ? list[3] : Crisp::Type.new(nil) |
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else |
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list[2] |
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list[2] |
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end |
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next # TCO |
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when "fn*" |
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when "fn*" |
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params = list[1].unwrap |
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unless params.is_a? Array |
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eval_error "'fn*' parameters must be list or vector: #{params}" |
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class="n">Crisp class="o">.eval_error "'fn*' parameters must be list or vector: #{params}" |
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end |
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Crisp::Closure.new(list[2], params, env, func_of(env, params, list[2])) |
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when "quote" |
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when "quote" |
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list[1] |
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when "quasiquote" |
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when "quasiquote" |
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ast = quasiquote list[1] |
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next # TCO |
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when "defmacro!" |
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eval_error "wrong number of argument for 'defmacro!'" unless list.size == 3 |
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when "defmacro!" |
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Crisp.eval_error "wrong number of argument for 'defmacro!'" unless list.size == 3 |
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a1 = list[1].unwrap |
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eval_error "1st argument of 'defmacro!' must be symbol: #{a1}" unless a1.is_a? Crisp::Symbol |
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Crisp.eval_error "1st argument of 'defmacro!' must be symbol: #{a1}" unless a1.is_a? Crisp::Symbol |
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env.set(a1.str, eval(list[2], env).tap{|n| n.is_macro = true}) |
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when "macroexpand" |
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when "macroexpand" |
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macroexpand(list[1], env) |
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when "try*" |
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when "try*" |
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catch_list = list[2].unwrap |
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return eval(list[1], env) unless catch_list.is_a? Crisp::List |
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@ -246,22 +246,22 @@ module Crisp |
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return eval(list[1], env) unless catch_head.str == "catch*" |
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begin |
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eval(list[1], env) |
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eval(list[1], env) |
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rescue e : Crisp::RuntimeException |
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new_env = Crisp::Env.new(env, [catch_list[1]], [e.thrown]) |
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eval(catch_list[2], new_env) |
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new_env = Crisp::Env.new(env, [catch_list[1]], [e.thrown]) |
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eval(catch_list[2], new_env) |
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rescue e |
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new_env = Crisp::Env.new(env, [catch_list[1]], [Crisp::Type.new e.message]) |
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eval(catch_list[2], new_env) |
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new_env = Crisp::Env.new(env, [catch_list[1]], [Crisp::Type.new e.message]) |
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eval(catch_list[2], new_env) |
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end |
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else |
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else |
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invoke_list(list, env) |
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end |
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end |
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end |
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end |
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end |
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def print(result) |
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@printer.print(result) |
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@printer.print(result) |
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end |
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def eval_string(str) |
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rhysd
9 years ago