Snippets
Revised by
VadimD
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#macro txr_error global.txr_error_val
// parser:
#macro txr_parse_tokens global.txr_parse_tokens_val
txr_parse_tokens = ds_list_create();
enum txr_token {
eof = 0, // <end of file>
op = 1, // + - * / % div
par_open = 2, // (
par_close = 3, // )
number = 4, // 37
ident = 5, // some
}
enum txr_op {
mul = 0x01, // *
fdiv = 0x02, // /
fmod = 0x03, // %
idiv = 0x04, // div
add = 0x10, // +
sub = 0x11, // -
maxp = 0x20 // maximum priority
}
// builder:
#macro txr_build_list global.txr_build_list_val
#macro txr_build_node global.txr_build_node_val
#macro txr_build_pos global.txr_build_pos_val
#macro txr_build_len global.txr_build_len_val
enum txr_node {
number = 1, // (number)
ident = 2, // (name)
unop = 3, // (unop, node)
binop = 4, // (binop, a, b)
}
enum txr_unop {
negate = 1, // -value
}
enum txr_build_flag {
no_ops = 1
}
// compiler:
#macro txr_compile_list global.txr_compile_list_val
txr_compile_list = ds_list_create();
enum txr_action {
number = 1, // (value): push(value)
ident = 2, // (name): push(self[name])
unop = 3, // (unop): push(-pop())
binop = 4, // (op): a = pop(); b = pop(); push(binop(op, a, b))
}
#define txr_parse
var str = argument0;
var len = string_length(str);
var out = txr_parse_tokens;
ds_list_clear(out);
var pos = 1;
while (pos <= len) {
var start = pos;
var char = string_ord_at(str, pos);
pos += 1;
switch (char) {
case ord(" "): case ord("\t"): case ord("\r"): case ord("\n"): break;
case ord("("): ds_list_add(out, [txr_token.par_open, start]); break;
case ord(")"): ds_list_add(out, [txr_token.par_close, start]); break;
case ord("+"): ds_list_add(out, [txr_token.op, start, txr_op.add]); break;
case ord("-"): ds_list_add(out, [txr_token.op, start, txr_op.sub]); break;
case ord("*"): ds_list_add(out, [txr_token.op, start, txr_op.mul]); break;
case ord("/"): ds_list_add(out, [txr_token.op, start, txr_op.fdiv]); break;
case ord("%"): ds_list_add(out, [txr_token.op, start, txr_op.fmod]); break;
default:
if (char >= ord("0") && char <= ord("9")) {
while (pos <= len) {
char = string_ord_at(str, pos);
if (char >= ord("0") && char <= ord("9")) {
pos += 1;
} else break;
}
var val = real(string_copy(str, start, pos - start));
ds_list_add(out, [txr_token.number, start, val]);
}
else if (char == ord("_")
|| (char >= ord("a") && char <= ord("z"))
|| (char >= ord("A") && char <= ord("Z"))
) {
while (pos <= len) {
char = string_ord_at(str, pos);
if (char == ord("_")
|| (char >= ord("0") && char <= ord("9"))
|| (char >= ord("a") && char <= ord("z"))
|| (char >= ord("A") && char <= ord("Z"))
) {
pos += 1;
} else break;
}
var name = string_copy(str, start, pos - start);
switch (name) {
case "mod": ds_list_add(out, [txr_token.op, start, txr_op.fmod]); break;
case "div": ds_list_add(out, [txr_token.op, start, txr_op.idiv]); break;
default: ds_list_add(out, [txr_token.ident, start, name]); break;
}
}
else {
ds_list_clear(out);
return txr_throw("Unexpected character `" + chr(char) + "`", start);
}
}
}
ds_list_add(out, [txr_token.eof, len + 1]);
return false;
#define txr_throw
/// @desc txr_throw(error_text, position)
/// @param error_text
/// @param position
txr_error = argument0 + " at position " + string(argument1);
return true;
#define txr_build
txr_build_list = txr_parse_tokens;
txr_build_pos = 0;
txr_build_len = ds_list_size(txr_build_list);
if (txr_build_expr(0)) return true;
if (txr_build_pos < txr_build_len - 1) {
return txr_throw_at("Trailing data", txr_parse_tokens[|txr_build_pos]);
} else return false;
#define txr_build_expr
/// @param flags
var flags = argument0;
var tk = txr_build_list[|txr_build_pos++];
switch (tk[0]) {
case txr_token.number: txr_build_node = [txr_node.number, tk[1], tk[2]]; break;
case txr_token.ident: txr_build_node = [txr_node.ident, tk[1], tk[2]]; break;
case txr_token.par_open: // (value)
if (txr_build_expr(0)) return true;
tk = txr_build_list[|txr_build_pos++];
if (tk[0] != txr_token.par_close) return txr_throw_at("Expected a `)`", tk);
break;
case txr_token.op: // -value, +value
switch (tk[2]) {
case txr_op.add:
if (txr_build_expr(txr_build_flag.no_ops)) return true;
break;
case txr_op.sub:
if (txr_build_expr(txr_build_flag.no_ops)) return true;
txr_build_node = [txr_node.unop, tk[1], txr_unop.negate, txr_build_node];
break;
default: return txr_throw_at("Unexpected token", tk);
}
break;
default: return txr_throw_at("Unexpected token", tk);
}
if ((flags & txr_build_flag.no_ops) == 0) {
tk = txr_build_list[|txr_build_pos];
if (tk[0] == txr_token.op) {
txr_build_pos += 1;
if (txr_build_ops(tk)) return true;
}
}
return false;
#define txr_build_ops
/// @param first
var nodes = ds_list_create();
ds_list_add(nodes, txr_build_node);
var ops = ds_list_create();
ds_list_add(ops, argument0);
//
var tk;
while (1) {
// try to read the next expression and add it to list:
if (txr_build_expr(txr_build_flag.no_ops)) {
ds_list_destroy(nodes);
ds_list_destroy(ops);
return true;
}
ds_list_add(nodes, txr_build_node);
// if followed by an operator, add that too, stop otherwise:
tk = txr_build_list[|txr_build_pos];
if (tk[0] == txr_token.op) {
txr_build_pos++;
ds_list_add(ops, tk);
} else break;
}
// Nest operators from top to bottom priority:
var n = ds_list_size(ops);
var pmax = (txr_op.maxp >> 4);
var pri = 0;
while (pri < pmax) {
for (var i = 0; i < n; i++) {
tk = ops[|i];
if ((tk[2] >> 4) != pri) continue;
nodes[|i] = [txr_node.binop, tk[1], tk[2], nodes[|i], nodes[|i + 1]];
ds_list_delete(nodes, i + 1);
ds_list_delete(ops, i);
n -= 1; i -= 1;
}
pri += 1;
}
// Cleanup and return:
txr_build_node = nodes[|0];
ds_list_destroy(nodes);
ds_list_destroy(ops);
return false;
#define txr_throw_at
/// @param error_text
/// @param token
var tk = argument1;
if (tk[0] == txr_token.eof) {
return txr_throw(argument0, "<EOF>");
} else return txr_throw(argument0, tk[1]);
#define txr_compile_expr
/// @param node
var q = argument0;
var out = txr_compile_list;
switch (q[0]) {
case txr_node.number: ds_list_add(out, [txr_action.number, q[1], q[2]]); break;
case txr_node.ident: ds_list_add(out, [txr_action.ident, q[1], q[2]]); break;
case txr_node.unop:
if (txr_compile_expr(q[3])) return true;
ds_list_add(out, [txr_action.unop, q[1], q[2]]);
break;
case txr_node.binop:
if (txr_compile_expr(q[3])) return true;
if (txr_compile_expr(q[4])) return true;
ds_list_add(out, [txr_action.binop, q[1], q[2]]);
break;
default: return txr_throw_at("Cannot compile node type " + string(q[0]), q);
}
return false;
#define txr_compile
if (txr_parse(argument0)) return undefined;
if (txr_build()) return undefined;
var out = txr_compile_list;
ds_list_clear(out);
if (txr_compile_expr(txr_build_node)) return undefined;
var n = ds_list_size(out);
var arr = array_create(n);
for (var i = 0; i < n; i++) arr[i] = out[|i];
ds_list_clear(out);
return arr;
#define txr_exec
/// @param actions
var arr = argument0;
var len = array_length_1d(arr);
var pos = 0;
var stack = ds_stack_create();
while (pos < len) {
var q = arr[pos++];
switch (q[0]) {
case txr_action.number: ds_stack_push(stack, q[2]); break;
case txr_action.unop: ds_stack_push(stack, -ds_stack_pop(stack)); break;
case txr_action.binop:
var b = ds_stack_pop(stack);
var a = ds_stack_pop(stack);
switch (q[2]) {
case txr_op.add: a += b; break;
case txr_op.sub: a -= b; break;
case txr_op.mul: a *= b; break;
case txr_op.fdiv: a /= b; break;
case txr_op.fmod: if (b != 0) a %= b; else a = 0; break;
case txr_op.idiv: if (b != 0) a = a div b; else a = 0; break;
default: return txr_exec_exit("Can't apply operator " + string(q[2]), q, stack);
}
ds_stack_push(stack, a);
break;
case txr_action.ident:
var v = variable_instance_get(id, q[2]);
if (is_real(v) || is_int64(v) || is_bool(v)) {
ds_stack_push(stack, v);
} else return txr_exec_exit("Variable `" + q[2] + "` is not a number", q, stack);
break;
default: return txr_exec_exit("Can't run action " + string(q[0]), q, stack);
}
}
var r = ds_stack_pop(stack);
ds_stack_destroy(stack);
txr_error = "";
return r;
#define txr_exec_exit
/// @param error_text
/// @param action
/// @param stack
ds_stack_destroy(argument2);
return txr_throw(argument0, argument1[1]);
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