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Slash

Slash

Slash is a pl created in 2012.

#373on PLDB 10Years Old 658Users
0Books 0Papers 572Repos

A new language for the web


Example from Linguist:
<% class Env { def init { @memory = []; @ptr = 0; } def ptr { @ptr } def ptr=(ptr) { @ptr = ptr } def current_value { @memory[@ptr] || 0 } def current_value=(value) { @memory[@ptr] = value } } class AST { class Next { def eval(env) { env.ptr++; } } class Prev { def eval(env) { env.ptr--; } } class Inc { def eval(env) { env.current_value++; } } class Dec { def eval(env) { env.current_value--; } } class Output { def eval(env) { print(env.current_value.char); } } class Input { def eval(env) { ... } } class Sequence { def init(nodes) { @nodes = nodes; } def eval(env) { for node in @nodes { node.eval(env); } } } class Loop { def init(seq) { @seq = seq; } def eval(env) { while env.current_value != 0 { @seq.eval(env); } } } } class Parser { def init(str) { @chars = str.split(""); } def parse { @stack = [[]]; for char in @chars { _parse_char(char); } if @stack.length != 1 { throw SyntaxError.new("unexpected end of input"); } AST::Sequence.new(@stack.last); } def _parse_char(char) { switch char { ">" { _add(AST::Next.new); } "<" { _add(AST::Prev.new); } "+" { _add(AST::Inc.new); } "-" { _add(AST::Dec.new); } "." { _add(AST::Output.new); } "," { _add(AST::Input.new); } "[" { _open_loop(); } "]" { _close_loop(); } } } def _add(node) { @stack.last.push(node); } def _open_loop { @stack.push([]); } def _close_loop { if @stack.length == 1 { throw SyntaxError.new("unexpected ']'"); } nodes = @stack.pop; _add(AST::Loop.new(AST::Sequence.new(nodes))); } } src = File.read(ARGV.first); ast = Parser.new(src).parse; ast.eval(Env.new);
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