🐐 TEMPTA/CAPE

README.md

@@ -38,16 +38,11 @@ Variable can consist of lower-case letters, numbers, as well as `_`.
 
 Multiple variables can be assigned at once by unpacking an array or multi-return function:
 
-```
+![Destructuring function](snippets/destructure_fn.png)
-DEFINI pair (a, b) VT { REDI (a, b) }
-DESIGNA x, y VT INVOCA pair (III, VII)
-```
 
 The number of targets must match the length of the array. This also works with array literals:
 
-```
+![Destructuring array](snippets/destructure_array.png)
-DESIGNA a, b, c VT [I, II, III]
-```
 
 ## Data types
 ### NVLLVS
@@ -69,17 +64,27 @@ Strings are concatenated with `&`:
 
 Double-quoted strings support interpolation with `{expression}`:
 
-```
+![String interpolation](snippets/string_interp.png)
-DESIGNA nomen VT "Marcus"
-DICE("Salve, {nomen}!")        // → Salve, Marcus!
-DICE("Sum: {III + IV}")        // → Sum: VII
-DICE("{nomen} has {V} cats")   // → Marcus has V cats
-```
 
 Any expression can appear inside `{}`. Values are coerced to strings the same way as with `&` (integers become Roman numerals, booleans become `VERITAS`/`FALSITAS`, etc.).
 
 Single-quoted strings do **not** interpolate — `'{nomen}'` is the literal text `{nomen}`. Use `{{` and `}}` for literal braces in double-quoted strings: `"use {{braces}}"` → `use {braces}`.
 
+#### String Indexing and Slicing
+
+Strings support the same indexing and slicing syntax as arrays. Indexing is 1-based and returns a single-character string:
+
+```
+"SALVTE"[I]             @> "S"
+"SALVTE"[III]           @> "L"
+```
+
+Slicing uses `VSQVE` with inclusive bounds, returning a substring:
+
+```
+"SALVTE"[II VSQVE IV]   @> "ALV"
+```
+
 Integer modulo is `RELIQVVM`: `VII RELIQVVM III` evaluates to `I`. Under the `FRACTIO` module it returns a fraction, so `IIIS RELIQVVM IS` is `S` (i.e. 1/2).
 
 ### Integers
@@ -115,10 +120,14 @@ Arrays are defined using square brackets (`[]`) and commas (`,`):
 
 ![Array literal](snippets/array_literal.png)
 
-An array of integers can also be initialized with the `VSQVE` keyword:
+An array of integers can also be initialized with the `VSQVE` keyword. The range is inclusive on both ends:
 
 ![Array with VSQVE](snippets/array_vsqve.png)
 
+```
+> [I, II, III, IV, V, VI, VII, VIII, IX, X]
+```
+
 Individual elements can be accessed by index using square brackets. Indexing is 1-based, so `I` refers to the first element:
 
 ![Array indexing](snippets/array_index.png)
@@ -127,29 +136,27 @@ Individual elements can be accessed by index using square brackets. Indexing is
 > I
 ```
 
+A sub-array can be extracted with `VSQVE` inside the index brackets. Both bounds are inclusive and 1-based:
+
+![Array slicing](snippets/array_slice.png)
+
+```
+> [XX, XXX, XL]
+```
+
 ### Dicts (TABVLA)
 
 Dicts are key-value maps created with the `TABVLA` keyword and curly braces:
 
-```
+![Dict creation](snippets/dict_create.png)
-DESIGNA d VT TABVLA {"nomen" VT "Marcus", "aetas" VT XXV}
-```
 
 Keys must be strings or integers. Values are accessed and assigned with square brackets:
 
-```
+![Dict access](snippets/dict_access.png)
-DICE(d["nomen"])              // → Marcus
-DESIGNA d["aetas"] VT XXVI   // update existing key
-DESIGNA d["novus"] VT I      // insert new key
-```
 
 Iterating over a dict with `PER` loops over its keys:
 
-```
+![Dict iteration](snippets/dict_per.png)
-PER k IN d FACE {
-  DICE(k)
-}
-```
 
 `LONGITVDO(dict)` returns the number of entries. `CLAVES(dict)` returns the keys as an array.
 
@@ -198,7 +205,7 @@ The keyword `ET` can be used as a boolean "and". The keyword `AVT` can be used a
 ![DONICVM loop](snippets/donicvm.png)
 
 ```
-> XLV
+> LV
 ```
 
 ### DVM loops
@@ -233,6 +240,24 @@ condition. Exit the loop with `ERVMPE` (or `REDI` from inside a function).
 > V
 ```
 
+## Error handling
+
+Errors can be caught using `TEMPTA` (temptare = to try) and `CAPE` (capere = to catch). The `CAPE` block binds the error message to a variable as a string.
+
+```
+TEMPTA {
+  DESIGNA x VT I / NVLLVS
+} CAPE error {
+  DICE(error)
+}
+```
+
+```
+> Division by zero
+```
+
+If the try block succeeds, the catch block is skipped. If an error occurs in the catch block, it propagates up. `TEMPTA`/`CAPE` blocks can be nested.
+
 ## Functions
 Functions are defined with the `DEFINI` and `VT` keywords. The `REDI` keyword is used to return. `REDI` can also be used to end the program, if used outside of a function.
 
@@ -304,11 +329,26 @@ Returns the length of `array` (element count), `string` (character count), or `d
 
 Returns the keys of `dict` as an array.
 
+### ORDINA
+`ORDINA(array)`
+
+Sorts an array in ascending order. Returns a new sorted array. All elements must be the same type — integers, fractions, or strings. Integers and fractions sort numerically; strings sort lexicographically.
+
 ### SENATVS
 `SENATVS(bool, ...)` or `SENATVS([bool])`
 
 Returns VERITAS if a strict majority of the arguments are VERITAS, FALSITAS otherwise. Also accepts a single array of booleans. All values must be booleans. Ties return FALSITAS.
 
+### TYPVS
+`TYPVS(value)`
+
+Returns the type of `value` as a string: `NVMERVS` (integer), `LITTERA` (string), `VERAX` (boolean), `CATALOGVS` (list), `FRACTIO` (fraction), `TABVLA` (dict), `FVNCTIO` (function), or `NVLLVS` (null).
+
+### DORMI
+`DORMI(n)`
+
+Sleeps for `n` seconds, where `n` is an integer, fraction, or NVLLVS (treated as 0). Returns nothing meaningful.
+
 ## Modules
 Modules are additions to the base `CENTVRION` syntax. They add or change certain features. Modules are included in your code by having
 
@@ -353,6 +393,16 @@ When `_` is added _after_ a numeric symbol, the symbol becomes 1.000 times large
 
 All integer symbols except `I` may be given a `_`.
 
+### SCRIPTA
+
+The `SCRIPTA` module adds file I/O to your `CENTVRION` program. It adds 3 new built-in functions: `LEGE string`, `SCRIBE string string`, and `ADIVNGE string string`.
+
+`LEGE string` reads the contents of the file at the given path and returns them as a string.
+
+`SCRIBE string string` writes the second argument to the file at the path given by the first argument, overwriting any existing content.
+
+`ADIVNGE string string` appends the second argument to the file at the path given by the first argument.
+
 ### SVBNVLLA
 ![CVM SVBNVLLA](snippets/svbnvlla.png)
 

centvrion/ast_nodes.py

@@ -1,5 +1,6 @@
 import re
 import random
+import time
 from fractions import Fraction
 
 from rply.token import BaseBox
@@ -279,7 +280,7 @@ class DataRangeArray(Node):
       raise CentvrionError("Range bounds must be numbers")
     from_int = from_val.value() or 0
     to_int = to_val.value() or 0
-    return vtable, ValList([ValInt(i) for i in range(from_int, to_int)])
+    return vtable, ValList([ValInt(i) for i in range(from_int, to_int + 1)])
 
 
 class DataDict(Node):
@@ -832,6 +833,17 @@ class ArrayIndex(Node):
       if k not in d:
         raise CentvrionError(f"Key not found in dict")
       return vtable, d[k]
+    if isinstance(array, ValStr):
+      if isinstance(index, ValInt):
+        i = index.value()
+      elif isinstance(index, ValFrac) and index.value().denominator == 1:
+        i = index.value().numerator
+      else:
+        raise CentvrionError("String index must be a number")
+      s = array.value()
+      if i < 1 or i > len(s):
+        raise CentvrionError(f"Index {i} out of range for string of length {len(s)}")
+      return vtable, ValStr(s[i - 1])
     if not isinstance(array, ValList):
       raise CentvrionError("Cannot index a non-array value")
     if isinstance(index, ValInt):
@@ -846,6 +858,59 @@ class ArrayIndex(Node):
     return vtable, lst[i - 1]
 
 
+def _to_index_int(val):
+  if isinstance(val, ValInt):
+    return val.value()
+  if isinstance(val, ValFrac) and val.value().denominator == 1:
+    return val.value().numerator
+  raise CentvrionError("Array index must be a number")
+
+
+class ArraySlice(Node):
+  def __init__(self, array, from_index, to_index) -> None:
+    self.array = array
+    self.from_index = from_index
+    self.to_index = to_index
+
+  def __eq__(self, other):
+    return (type(self) == type(other)
+      and self.array == other.array
+      and self.from_index == other.from_index
+      and self.to_index == other.to_index)
+
+  def __repr__(self) -> str:
+    return f"ArraySlice({self.array!r}, {self.from_index!r}, {self.to_index!r})"
+
+  def print(self):
+    return f"{self.array.print()}[{self.from_index.print()} VSQVE {self.to_index.print()}]"
+
+  def _eval(self, vtable):
+    vtable, array = self.array.eval(vtable)
+    vtable, from_val = self.from_index.eval(vtable)
+    vtable, to_val = self.to_index.eval(vtable)
+    if isinstance(array, ValStr):
+      from_int = _to_index_int(from_val)
+      to_int = _to_index_int(to_val)
+      s = array.value()
+      if from_int < 1 or to_int > len(s) or from_int > to_int:
+        raise CentvrionError(
+          f"Slice [{from_int} VSQVE {to_int}] out of range"
+          f" for string of length {len(s)}"
+        )
+      return vtable, ValStr(s[from_int - 1 : to_int])
+    if not isinstance(array, ValList):
+      raise CentvrionError("Cannot slice a non-array value")
+    from_int = _to_index_int(from_val)
+    to_int = _to_index_int(to_val)
+    lst = array.value()
+    if from_int < 1 or to_int > len(lst) or from_int > to_int:
+      raise CentvrionError(
+        f"Slice [{from_int} VSQVE {to_int}] out of range"
+        f" for array of length {len(lst)}"
+      )
+    return vtable, ValList(lst[from_int - 1 : to_int])
+
+
 class SiStatement(Node):
   def __init__(self, test, statements, else_part) -> None:
     self.test = test
@@ -980,6 +1045,45 @@ class PerStatement(Node):
     return vtable, last_val
 
 
+class TemptaStatement(Node):
+  def __init__(self, try_statements, error_var, catch_statements) -> None:
+    self.try_statements = try_statements
+    self.error_var = error_var
+    self.catch_statements = catch_statements
+
+  def __eq__(self, other):
+    return (type(self) == type(other)
+      and self.try_statements == other.try_statements
+      and self.error_var == other.error_var
+      and self.catch_statements == other.catch_statements)
+
+  def __repr__(self) -> str:
+    try_stmts = f"try([{rep_join(self.try_statements)}])"
+    catch_stmts = f"catch([{rep_join(self.catch_statements)}])"
+    tempta_string = rep_join([try_stmts, repr(self.error_var), catch_stmts])
+    return f"Tempta({tempta_string})"
+
+  def print(self):
+    try_body = "\n".join(s.print() for s in self.try_statements)
+    catch_body = "\n".join(s.print() for s in self.catch_statements)
+    return f"TEMPTA {{\n{try_body}\n}} CAPE {self.error_var.print()} {{\n{catch_body}\n}}"
+
+  def _eval(self, vtable):
+    last_val = ValNul()
+    try:
+      for statement in self.try_statements:
+        vtable, last_val = statement.eval(vtable)
+        if vtable["#return"] is not None or vtable["#break"] or vtable["#continue"]:
+          return vtable, last_val
+    except CentvrionError as e:
+      vtable[self.error_var.name] = ValStr(str(e))
+      for statement in self.catch_statements:
+        vtable, last_val = statement.eval(vtable)
+        if vtable["#return"] is not None or vtable["#break"] or vtable["#continue"]:
+          return vtable, last_val
+    return vtable, last_val
+
+
 class Invoca(Node):
   def __init__(self, callee, parameters) -> None:
     self.callee = callee
@@ -1121,6 +1225,58 @@ class BuiltIn(Node):
       case "EVERRO":
         print("\033[2J\033[H", end="", flush=True)
         return vtable, ValNul()
+      case "ORDINA":
+        if not isinstance(params[0], ValList):
+          raise CentvrionError("ORDINA requires an array")
+        items = list(params[0].value())
+        if not items:
+          return vtable, ValList([])
+        all_numeric = all(isinstance(i, (ValInt, ValFrac)) for i in items)
+        all_string = all(isinstance(i, ValStr) for i in items)
+        if not (all_numeric or all_string):
+          raise CentvrionError("ORDINA requires all elements to be numbers or all strings")
+        return vtable, ValList(sorted(items, key=lambda v: v.value()))
+      case "TYPVS":
+        type_map = {
+          ValInt: "NVMERVS", ValStr: "LITTERA", ValBool: "VERAX",
+          ValList: "CATALOGVS", ValFrac: "FRACTIO", ValDict: "TABVLA",
+          ValFunc: "FVNCTIO", ValNul: "NVLLVS",
+        }
+        return vtable, ValStr(type_map[type(params[0])])
+      case "DORMI":
+        v = params[0]
+        if isinstance(v, ValNul):
+          seconds = 0
+        elif isinstance(v, ValInt):
+          seconds = v.value()
+        elif isinstance(v, ValFrac):
+          seconds = float(v.value())
+        else:
+          raise CentvrionError("DORMI requires a number or NVLLVS")
+        time.sleep(seconds)
+        return vtable, ValNul()
+      case "LEGE":
+        if "SCRIPTA" not in vtable["#modules"]:
+          raise CentvrionError("Cannot use 'LEGE' without module 'SCRIPTA'")
+        path = make_string(params[0], magnvm, svbnvlla)
+        with open(path, "r") as f:
+          return vtable, ValStr(f.read())
+      case "SCRIBE":
+        if "SCRIPTA" not in vtable["#modules"]:
+          raise CentvrionError("Cannot use 'SCRIBE' without module 'SCRIPTA'")
+        path = make_string(params[0], magnvm, svbnvlla)
+        content = make_string(params[1], magnvm, svbnvlla)
+        with open(path, "w") as f:
+          f.write(content)
+        return vtable, ValNul()
+      case "ADIVNGE":
+        if "SCRIPTA" not in vtable["#modules"]:
+          raise CentvrionError("Cannot use 'ADIVNGE' without module 'SCRIPTA'")
+        path = make_string(params[0], magnvm, svbnvlla)
+        content = make_string(params[1], magnvm, svbnvlla)
+        with open(path, "a") as f:
+          f.write(content)
+        return vtable, ValNul()
       case _:
         raise NotImplementedError(self.builtin)
 

centvrion/compiler/emit_expr.py

@@ -2,7 +2,7 @@ from centvrion.errors import CentvrionError
 from centvrion.ast_nodes import (
   String, InterpolatedString, Numeral, Fractio, Bool, Nullus, ID,
   BinOp, UnaryMinus, UnaryNot,
-  ArrayIndex, DataArray, DataRangeArray, DataDict,
+  ArrayIndex, ArraySlice, DataArray, DataRangeArray, DataDict,
   BuiltIn, Invoca, Fvnctio,
   num_to_int, frac_to_fraction,
 )
@@ -120,6 +120,15 @@ def emit_expr(node, ctx):
     tmp = ctx.fresh_tmp()
     return arr_lines + idx_lines + [f"CentValue {tmp} = cent_list_index({arr_var}, {idx_var});"], tmp
 
+  if isinstance(node, ArraySlice):
+    arr_lines, arr_var = emit_expr(node.array, ctx)
+    lo_lines, lo_var = emit_expr(node.from_index, ctx)
+    hi_lines, hi_var = emit_expr(node.to_index, ctx)
+    tmp = ctx.fresh_tmp()
+    return arr_lines + lo_lines + hi_lines + [
+      f"CentValue {tmp} = cent_list_slice({arr_var}, {lo_var}, {hi_var});"
+    ], tmp
+
   if isinstance(node, DataArray):
     lines = []
     tmp = ctx.fresh_tmp()
@@ -135,10 +144,10 @@ def emit_expr(node, ctx):
     hi_lines, hi_var = emit_expr(node.to_value, ctx)
     tmp = ctx.fresh_tmp()
     i_var = ctx.fresh_tmp()
-    cap = f"({hi_var}.ival > {lo_var}.ival ? (int)({hi_var}.ival - {lo_var}.ival) : 0)"
+    cap = f"({hi_var}.ival >= {lo_var}.ival ? (int)({hi_var}.ival - {lo_var}.ival + 1) : 0)"
     lines = lo_lines + hi_lines + [
       f"CentValue {tmp} = cent_list_new({cap});",
-      f"for (long {i_var} = {lo_var}.ival; {i_var} < {hi_var}.ival; {i_var}++) {{",
+      f"for (long {i_var} = {lo_var}.ival; {i_var} <= {hi_var}.ival; {i_var}++) {{",
       f"  cent_list_push(&{tmp}, cent_int({i_var}));",
       "}",
     ]
@@ -251,10 +260,43 @@ def _emit_builtin(node, ctx):
     case "CLAVES":
       lines.append(f"CentValue {tmp} = cent_dict_keys({param_vars[0]});")
 
+    case "ORDINA":
+      lines.append(f"CentValue {tmp} = cent_ordina({param_vars[0]});")
+
     case "EVERRO":
       lines.append("cent_everro();")
       lines.append(f"CentValue {tmp} = cent_null();")
 
+    case "TYPVS":
+      lines.append(f"CentValue {tmp} = cent_typvs({param_vars[0]});")
+
+    case "DORMI":
+      lines.append(f"cent_dormi({param_vars[0]});")
+      lines.append(f"CentValue {tmp} = cent_null();")
+
+    case "LEGE":
+      if not ctx.has_module("SCRIPTA"):
+        lines.append('cent_runtime_error("SCRIPTA module required for LEGE");')
+        lines.append(f"CentValue {tmp} = cent_null();")
+      else:
+        lines.append(f"CentValue {tmp} = cent_lege({param_vars[0]});")
+
+    case "SCRIBE":
+      if not ctx.has_module("SCRIPTA"):
+        lines.append('cent_runtime_error("SCRIPTA module required for SCRIBE");')
+        lines.append(f"CentValue {tmp} = cent_null();")
+      else:
+        lines.append(f"cent_scribe({param_vars[0]}, {param_vars[1]});")
+        lines.append(f"CentValue {tmp} = cent_null();")
+
+    case "ADIVNGE":
+      if not ctx.has_module("SCRIPTA"):
+        lines.append('cent_runtime_error("SCRIPTA module required for ADIVNGE");')
+        lines.append(f"CentValue {tmp} = cent_null();")
+      else:
+        lines.append(f"cent_adivnge({param_vars[0]}, {param_vars[1]});")
+        lines.append(f"CentValue {tmp} = cent_null();")
+
     case _:
       raise NotImplementedError(node.builtin)
 

centvrion/compiler/emit_stmt.py

@@ -1,6 +1,7 @@
 from centvrion.ast_nodes import (
   Designa, DesignaIndex, DesignaDestructure, SiStatement, DumStatement,
-  PerStatement, Defini, Redi, Erumpe, Continva, ExpressionStatement, ID,
+  PerStatement, TemptaStatement, Defini, Redi, Erumpe, Continva,
+  ExpressionStatement, ID,
 )
 from centvrion.compiler.emit_expr import emit_expr
 
@@ -125,6 +126,24 @@ def emit_stmt(node, ctx):
   if isinstance(node, Continva):
     return ["continue;"]
 
+  if isinstance(node, TemptaStatement):
+    lines = [
+      "_cent_try_depth++;",
+      "if (setjmp(_cent_try_stack[_cent_try_depth - 1]) == 0) {",
+    ]
+    try_lines = _emit_body(node.try_statements, ctx)
+    lines += [f"  {l}" for l in try_lines]
+    lines += [
+      "  _cent_try_depth--;",
+      "} else {",
+      "  _cent_try_depth--;",
+      f'  cent_scope_set(&_scope, "{node.error_var.name}", cent_str(_cent_error_msg));',
+    ]
+    catch_lines = _emit_body(node.catch_statements, ctx)
+    lines += [f"  {l}" for l in catch_lines]
+    lines += ["}"]
+    return lines
+
   if isinstance(node, ExpressionStatement):
     lines, _ = emit_expr(node.expression, ctx)
     return lines

centvrion/compiler/runtime/cent_runtime.c

@@ -11,6 +11,10 @@
 CentArena *cent_arena;
 int cent_magnvm = 0;
 
+jmp_buf _cent_try_stack[CENT_TRY_STACK_MAX];
+int     _cent_try_depth = 0;
+const char *_cent_error_msg = NULL;
+
 /* ------------------------------------------------------------------ */
 /* Arena allocator                                                      */
 /* ------------------------------------------------------------------ */
@@ -50,11 +54,19 @@ void *cent_arena_alloc(CentArena *a, size_t n) {
 /* ------------------------------------------------------------------ */
 
 void cent_type_error(const char *msg) {
+  if (_cent_try_depth > 0) {
+    _cent_error_msg = msg;
+    longjmp(_cent_try_stack[_cent_try_depth - 1], 1);
+  }
   fprintf(stderr, "CENTVRION type error: %s\n", msg);
   exit(1);
 }
 
 void cent_runtime_error(const char *msg) {
+  if (_cent_try_depth > 0) {
+    _cent_error_msg = msg;
+    longjmp(_cent_try_stack[_cent_try_depth - 1], 1);
+  }
   fprintf(stderr, "CENTVRION error: %s\n", msg);
   exit(1);
 }
@@ -545,6 +557,71 @@ CentValue cent_longitudo(CentValue v) {
   return cent_null(); /* unreachable; silences warning */
 }
 
+CentValue cent_typvs(CentValue v) {
+  switch (v.type) {
+    case CENT_INT:  return cent_str("NVMERVS");
+    case CENT_STR:  return cent_str("LITTERA");
+    case CENT_BOOL: return cent_str("VERAX");
+    case CENT_LIST: return cent_str("CATALOGVS");
+    case CENT_FRAC: return cent_str("FRACTIO");
+    case CENT_DICT: return cent_str("TABVLA");
+    case CENT_FUNC: return cent_str("FVNCTIO");
+    case CENT_NULL: return cent_str("NVLLVS");
+  }
+  return cent_str("IGNOTA"); /* unreachable */
+}
+
+void cent_dormi(CentValue n) {
+  struct timespec ts;
+  if (n.type == CENT_NULL) {
+    ts.tv_sec = 0; ts.tv_nsec = 0;
+  } else if (n.type == CENT_INT) {
+    ts.tv_sec = n.ival; ts.tv_nsec = 0;
+  } else if (n.type == CENT_FRAC) {
+    long sec = n.fval.num / n.fval.den;
+    long rem = n.fval.num % n.fval.den;
+    ts.tv_sec = sec;
+    ts.tv_nsec = rem * 1000000000L / n.fval.den;
+  } else {
+    cent_type_error("'DORMI' requires a number or NVLLVS");
+  }
+  nanosleep(&ts, NULL);
+}
+
+/* ---- SCRIPTA module ---- */
+
+CentValue cent_lege(CentValue path) {
+  const char *p = cent_make_string(path);
+  FILE *f = fopen(p, "r");
+  if (!f) cent_runtime_error("LEGE: cannot open file");
+  fseek(f, 0, SEEK_END);
+  long len = ftell(f);
+  fseek(f, 0, SEEK_SET);
+  char *buf = cent_arena_alloc(cent_arena, len + 1);
+  fread(buf, 1, len, f);
+  buf[len] = '\0';
+  fclose(f);
+  return cent_str(buf);
+}
+
+void cent_scribe(CentValue path, CentValue content) {
+  const char *p = cent_make_string(path);
+  const char *c = cent_make_string(content);
+  FILE *f = fopen(p, "w");
+  if (!f) cent_runtime_error("SCRIBE: cannot open file");
+  fputs(c, f);
+  fclose(f);
+}
+
+void cent_adivnge(CentValue path, CentValue content) {
+  const char *p = cent_make_string(path);
+  const char *c = cent_make_string(content);
+  FILE *f = fopen(p, "a");
+  if (!f) cent_runtime_error("ADIVNGE: cannot open file");
+  fputs(c, f);
+  fclose(f);
+}
+
 CentValue cent_fortis_numerus(CentValue lo, CentValue hi) {
   if (lo.type != CENT_INT || hi.type != CENT_INT)
     cent_type_error("'FORTIS_NVMERVS' requires two integers");
@@ -602,6 +679,36 @@ void cent_semen(CentValue seed) {
   srand((unsigned)seed.ival);
 }
 
+static int _ordina_comparator(const void *a, const void *b) {
+  const CentValue *va = (const CentValue *)a;
+  const CentValue *vb = (const CentValue *)b;
+  if ((va->type == CENT_INT || va->type == CENT_FRAC) &&
+      (vb->type == CENT_INT || vb->type == CENT_FRAC)) {
+    long an, ad, bn, bd;
+    to_frac(*va, &an, &ad);
+    to_frac(*vb, &bn, &bd);
+    long lhs = an * bd;
+    long rhs = bn * ad;
+    return (lhs > rhs) - (lhs < rhs);
+  }
+  if (va->type == CENT_STR && vb->type == CENT_STR)
+    return strcmp(va->sval, vb->sval);
+  cent_type_error("'ORDINA' requires all elements to be the same type");
+  return 0;
+}
+
+CentValue cent_ordina(CentValue lst) {
+  if (lst.type != CENT_LIST)
+    cent_type_error("'ORDINA' requires a list");
+  int len = lst.lval.len;
+  CentValue result = cent_list_new(len);
+  for (int i = 0; i < len; i++)
+    cent_list_push(&result, lst.lval.items[i]);
+  if (len > 1)
+    qsort(result.lval.items, len, sizeof(CentValue), _ordina_comparator);
+  return result;
+}
+
 /* ------------------------------------------------------------------ */
 /* Array helpers                                                        */
 /* ------------------------------------------------------------------ */
@@ -626,6 +733,22 @@ void cent_list_push(CentValue *lst, CentValue v) {
 CentValue cent_list_index(CentValue lst, CentValue idx) {
   if (lst.type == CENT_DICT)
     return cent_dict_get(lst, idx);
+  if (lst.type == CENT_STR) {
+    long i;
+    if (idx.type == CENT_INT)
+      i = idx.ival;
+    else if (idx.type == CENT_FRAC && idx.fval.den == 1)
+      i = idx.fval.num;
+    else
+      cent_type_error("string index must be an integer");
+    long slen = (long)strlen(lst.sval);
+    if (i < 1 || i > slen)
+      cent_runtime_error("string index out of range");
+    char *ch = cent_arena_alloc(cent_arena, 2);
+    ch[0] = lst.sval[i - 1];
+    ch[1] = '\0';
+    return cent_str(ch);
+  }
   if (lst.type != CENT_LIST)
     cent_type_error("index requires a list or dict");
   long i;
@@ -640,6 +763,36 @@ CentValue cent_list_index(CentValue lst, CentValue idx) {
   return lst.lval.items[i - 1];
 }
 
+CentValue cent_list_slice(CentValue lst, CentValue lo, CentValue hi) {
+  if (lst.type == CENT_STR) {
+    if (lo.type != CENT_INT || hi.type != CENT_INT)
+      cent_type_error("slice indices must be integers");
+    long from = lo.ival;
+    long to = hi.ival;
+    long slen = (long)strlen(lst.sval);
+    if (from < 1 || to > slen || from > to)
+      cent_runtime_error("string slice out of range");
+    int len = (int)(to - from + 1);
+    char *buf = cent_arena_alloc(cent_arena, len + 1);
+    memcpy(buf, lst.sval + from - 1, len);
+    buf[len] = '\0';
+    return cent_str(buf);
+  }
+  if (lst.type != CENT_LIST)
+    cent_type_error("slice requires a list");
+  if (lo.type != CENT_INT || hi.type != CENT_INT)
+    cent_type_error("slice indices must be integers");
+  long from = lo.ival;
+  long to = hi.ival;
+  if (from < 1 || to > lst.lval.len || from > to)
+    cent_runtime_error("slice out of range");
+  int len = (int)(to - from + 1);
+  CentValue result = cent_list_new(len);
+  for (long j = from; j <= to; j++)
+    cent_list_push(&result, lst.lval.items[j - 1]);
+  return result;
+}
+
 void cent_list_index_set(CentValue *lst, CentValue idx, CentValue v) {
   if (lst->type == CENT_DICT) {
     cent_dict_set(lst, idx, v);

centvrion/compiler/runtime/cent_runtime.h

@@ -3,6 +3,7 @@
 
 #include <stddef.h>
 #include <string.h>
+#include <setjmp.h>
 
 /* ------------------------------------------------------------------ */
 /* Types                                                                */
@@ -145,8 +146,13 @@ static inline CentValue cent_dict_val(CentValue *keys, CentValue *vals, int len,
 /* Error handling                                                       */
 /* ------------------------------------------------------------------ */
 
-void cent_type_error(const char *msg);     /* type mismatch → exit(1) */
+#define CENT_TRY_STACK_MAX 64
-void cent_runtime_error(const char *msg);  /* runtime fault  → exit(1) */
+extern jmp_buf _cent_try_stack[];
+extern int     _cent_try_depth;
+extern const char *_cent_error_msg;
+
+void cent_type_error(const char *msg);     /* type mismatch → longjmp or exit(1) */
+void cent_runtime_error(const char *msg);  /* runtime fault  → longjmp or exit(1) */
 
 /* ------------------------------------------------------------------ */
 /* Truthiness — conditions must be booleans; anything else is a fault  */
@@ -220,6 +226,12 @@ CentValue cent_decimatio(CentValue lst);                       /* DECIMATIO */
 void      cent_semen(CentValue seed);                          /* SEMEN */
 void      cent_everro(void);                                   /* EVERRO */
 CentValue cent_senatus(CentValue *args, int n);                /* SENATVS */
+CentValue cent_typvs(CentValue v);                              /* TYPVS */
+void      cent_dormi(CentValue n);                              /* DORMI */
+CentValue cent_ordina(CentValue lst);                           /* ORDINA */
+CentValue cent_lege(CentValue path);                            /* LEGE */
+void      cent_scribe(CentValue path, CentValue content);       /* SCRIBE */
+void      cent_adivnge(CentValue path, CentValue content);      /* ADIVNGE */
 
 /* ------------------------------------------------------------------ */
 /* Array helpers                                                        */
@@ -228,6 +240,7 @@ CentValue cent_senatus(CentValue *args, int n);                /* SENATVS */
 CentValue cent_list_new(int cap);
 void      cent_list_push(CentValue *lst, CentValue v);
 CentValue cent_list_index(CentValue lst, CentValue idx);        /* 1-based */
+CentValue cent_list_slice(CentValue lst, CentValue lo, CentValue hi); /* 1-based, inclusive */
 void      cent_list_index_set(CentValue *lst, CentValue idx, CentValue v);
 
 /* ------------------------------------------------------------------ */

centvrion/lexer.py

@@ -6,6 +6,7 @@ keyword_tokens = [("KEYWORD_"+i, i) for i in [
   "AETERNVM",
   "ALVID",
   "AVGE",
+  "CAPE",
   "AVT",
   "DEFINI",
   "DESIGNA",
@@ -32,6 +33,7 @@ keyword_tokens = [("KEYWORD_"+i, i) for i in [
   "SI",
   "TVNC",
   "TABVLA",
+  "TEMPTA",
   "VSQVE",
   "VT",
   "VERITAS",
@@ -44,12 +46,18 @@ builtin_tokens = [("BUILTIN", i) for i in [
   "CLAVES",
   "DECIMATIO",
   "DICE",
+  "DORMI",
   "EVERRO",
   "FORTIS_NVMERVS",
   "FORTIS_ELECTIONIS",
   "LONGITVDO",
+  "ORDINA",
   "SEMEN",
-  "SENATVS"
+  "SENATVS",
+  "TYPVS",
+  "LEGE",
+  "SCRIBE",
+  "ADIVNGE"
 ]]
 
 data_tokens = [
@@ -62,6 +70,7 @@ module_tokens = [("MODULE", i) for i in [
   "FORS",
   "FRACTIO",
   "MAGNVM",
+  "SCRIPTA",
   "SVBNVLLA"
 ]]
 

centvrion/parser.py

@@ -163,6 +163,7 @@ class Parser():
     @self.pg.production('statement : dum_statement')
     @self.pg.production('statement : donicum_statement')
     @self.pg.production('statement : si_statement')
+    @self.pg.production('statement : tempta_statement')
     def nested_statements(tokens):
       return tokens[0]
 
@@ -203,6 +204,10 @@ class Parser():
     def per(tokens):
       return ast_nodes.PerStatement(tokens[3], tokens[1], tokens[6])
 
+    @self.pg.production('tempta_statement : KEYWORD_TEMPTA SYMBOL_LCURL statements SYMBOL_RCURL KEYWORD_CAPE id SYMBOL_LCURL statements SYMBOL_RCURL')
+    def tempta(tokens):
+      return ast_nodes.TemptaStatement(tokens[2], tokens[5], tokens[7])
+
     @self.pg.production('donicum_statement : KEYWORD_DONICVM id KEYWORD_VT expression KEYWORD_VSQVE expression KEYWORD_FACE SYMBOL_LCURL statements SYMBOL_RCURL')
     def donicum(tokens):
       range_array = ast_nodes.DataRangeArray(tokens[3], tokens[5])
@@ -326,6 +331,10 @@ class Parser():
     def array_index(tokens):
       return ast_nodes.ArrayIndex(tokens[0], tokens[2])
 
+    @self.pg.production('expression : expression SYMBOL_LBRACKET expression KEYWORD_VSQVE expression SYMBOL_RBRACKET', precedence='INDEX')
+    def array_slice(tokens):
+      return ast_nodes.ArraySlice(tokens[0], tokens[2], tokens[4])
+
     # ids
     @self.pg.production('ids : SYMBOL_LPARENS id_list')
     def ids(tokens):

examples/bubble_sort.cent

@@ -3,8 +3,8 @@
 DESIGNA arr VT [V, III, VIII, I, IX, II, VII, IV, VI, X]
 DESIGNA n VT LONGITVDO(arr)
 
-DONICVM i VT I VSQVE n FACE {
+DONICVM i VT I VSQVE n - I FACE {
-  DONICVM k VT I VSQVE n - i + I FACE {
+  DONICVM k VT I VSQVE n - i FACE {
     SI arr[k] PLVS arr[k + I] TVNC {
       DESIGNA temp VT arr[k]
       DESIGNA arr[k] VT arr[k + I]

examples/connect_iv.cent

@@ -6,7 +6,7 @@
 // Returns the bottommost empty row in col, or NVLLVS if full
 DEFINI find_slot(b, col) VT {
   DESIGNA ans VT NVLLVS
-  DONICVM r VT I VSQVE VII FACE {
+  DONICVM r VT I VSQVE VI FACE {
     SI b[(r - I) * VII + col] EST NVLLVS TVNC {
       DESIGNA ans VT r
     }
@@ -16,32 +16,32 @@ DEFINI find_slot(b, col) VT {
 
 // Returns VERITAS if player has four in a row
 DEFINI est_victor(b, player) VT {
-  DONICVM r VT I VSQVE VII FACE {
+  DONICVM r VT I VSQVE VI FACE {
-    DONICVM c VT I VSQVE V FACE {
+    DONICVM c VT I VSQVE IV FACE {
       DESIGNA idx VT (r - I) * VII + c
       SI b[idx] EST player ET b[idx + I] EST player ET b[idx + II] EST player ET b[idx + III] EST player TVNC {
         REDI(VERITAS)
       }
     }
   }
-  DONICVM r VT I VSQVE IV FACE {
+  DONICVM r VT I VSQVE III FACE {
-    DONICVM c VT I VSQVE VIII FACE {
+    DONICVM c VT I VSQVE VII FACE {
       DESIGNA idx VT (r - I) * VII + c
       SI b[idx] EST player ET b[idx + VII] EST player ET b[idx + XIV] EST player ET b[idx + XXI] EST player TVNC {
         REDI(VERITAS)
       }
     }
   }
-  DONICVM r VT I VSQVE IV FACE {
+  DONICVM r VT I VSQVE III FACE {
-    DONICVM c VT I VSQVE V FACE {
+    DONICVM c VT I VSQVE IV FACE {
       DESIGNA idx VT (r - I) * VII + c
       SI b[idx] EST player ET b[idx + VIII] EST player ET b[idx + XVI] EST player ET b[idx + XXIV] EST player TVNC {
         REDI(VERITAS)
       }
     }
   }
-  DONICVM r VT I VSQVE IV FACE {
+  DONICVM r VT I VSQVE III FACE {
-    DONICVM c VT IV VSQVE VIII FACE {
+    DONICVM c VT IV VSQVE VII FACE {
       DESIGNA idx VT (r - I) * VII + c
       SI b[idx] EST player ET b[idx + VI] EST player ET b[idx + XII] EST player ET b[idx + XVIII] EST player TVNC {
         REDI(VERITAS)
@@ -53,9 +53,9 @@ DEFINI est_victor(b, player) VT {
 
 DEFINI print_board(b) VT {
   DICE("+---+---+---+---+---+---+---+")
-  DONICVM r VT I VSQVE VII FACE {
+  DONICVM r VT I VSQVE VI FACE {
     DESIGNA line VT "| "
-    DONICVM c VT I VSQVE VIII FACE {
+    DONICVM c VT I VSQVE VII FACE {
       DESIGNA cell VT b[(r - I) * VII + c]
       SI cell EST I TVNC {
         DESIGNA line VT line & "X | "
@@ -101,35 +101,35 @@ DEFINI score_fenestram(a, b, c, d) VT {
 DEFINI aestima(b) VT {
   DESIGNA score VT NVLLVS
   // Center column preference: each AI piece in column IV is worth +1
-  DONICVM r VT I VSQVE VII FACE {
+  DONICVM r VT I VSQVE VI FACE {
     SI b[(r - I) * VII + IV] EST II TVNC {
       DESIGNA score VT score + I
     }
   }
   // Horizontal windows (6 rows x 4 starting columns = 24)
-  DONICVM r VT I VSQVE VII FACE {
+  DONICVM r VT I VSQVE VI FACE {
-    DONICVM c VT I VSQVE V FACE {
+    DONICVM c VT I VSQVE IV FACE {
       DESIGNA idx VT (r - I) * VII + c
       DESIGNA score VT score + INVOCA score_fenestram(b[idx], b[idx + I], b[idx + II], b[idx + III])
     }
   }
   // Vertical windows (3 starting rows x 7 columns = 21)
-  DONICVM r VT I VSQVE IV FACE {
+  DONICVM r VT I VSQVE III FACE {
-    DONICVM c VT I VSQVE VIII FACE {
+    DONICVM c VT I VSQVE VII FACE {
       DESIGNA idx VT (r - I) * VII + c
       DESIGNA score VT score + INVOCA score_fenestram(b[idx], b[idx + VII], b[idx + XIV], b[idx + XXI])
     }
   }
   // Diagonal up-right windows (3 starting rows x 4 starting columns = 12)
-  DONICVM r VT I VSQVE IV FACE {
+  DONICVM r VT I VSQVE III FACE {
-    DONICVM c VT I VSQVE V FACE {
+    DONICVM c VT I VSQVE IV FACE {
       DESIGNA idx VT (r - I) * VII + c
       DESIGNA score VT score + INVOCA score_fenestram(b[idx], b[idx + VIII], b[idx + XVI], b[idx + XXIV])
     }
   }
   // Diagonal up-left windows (3 starting rows x 4 starting columns = 12)
-  DONICVM r VT I VSQVE IV FACE {
+  DONICVM r VT I VSQVE III FACE {
-    DONICVM c VT IV VSQVE VIII FACE {
+    DONICVM c VT IV VSQVE VII FACE {
       DESIGNA idx VT (r - I) * VII + c
       DESIGNA score VT score + INVOCA score_fenestram(b[idx], b[idx + VI], b[idx + XII], b[idx + XVIII])
     }
@@ -219,8 +219,8 @@ DEFINI ai_move(b) VT {
 }
 
 // --- Board setup ---
-DESIGNA board VT [I VSQVE XLIII]
+DESIGNA board VT [I VSQVE XLII]
-DONICVM i VT I VSQVE XLIII FACE {
+DONICVM i VT I VSQVE XLII FACE {
   DESIGNA board[i] VT NVLLVS
 }
 

examples/multiplication_table.cent

@@ -1,9 +1,9 @@
 // Prints an X×X multiplication table
 DESIGNA n VT X
 
-DONICVM i VT I VSQVE n + I FACE {
+DONICVM i VT I VSQVE n FACE {
   DESIGNA line VT ""
-  DONICVM k VT I VSQVE n + I FACE {
+  DONICVM k VT I VSQVE n FACE {
     DESIGNA line VT line & i * k & "  "
   }
   DICE(line)

examples/sieve.cent

@@ -2,9 +2,9 @@
 
 DESIGNA n VT L
 
-DONICVM i VT II VSQVE n + I FACE {
+DONICVM i VT II VSQVE n FACE {
   DESIGNA is_prime VT VERITAS
-  DONICVM k VT II VSQVE i FACE {
+  DONICVM k VT II VSQVE i - I FACE {
     SI (i / k) * k EST i TVNC {
       DESIGNA is_prime VT FALSITAS
     }

language/main.aux

@@ -0,0 +1,2 @@
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language/main.log

@@ -0,0 +1,269 @@
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+] [2] (./main.aux)
+ ***********
+LaTeX2e <2025-11-01>
+L3 programming layer <2026-01-19>
+ ***********
+ ) 
+Here is how much of TeX's memory you used:
+ 3526 strings out of 470191
+ 106539 string characters out of 5479698
+ 562689 words of memory out of 5000000
+ 32135 multiletter control sequences out of 15000+600000
+ 627857 words of font info for 57 fonts, out of 8000000 for 9000
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+
+Output written on main.pdf (2 pages).

language/main.tex

@@ -41,7 +41,10 @@
         \languageline{statement}{\texttt{DONICVM} \textbf{id} \texttt{VT} \textit{expression} \texttt{VSQVE} \textit{expression} \texttt{FACE} \textit{scope}} \\
         \languageline{statement}{\texttt{REDI(} \textit{optional-expressions} \texttt{)}} \\
         \languageline{statement}{\texttt{ERVMPE}} \\
-        \languageline{statement}{\texttt{CONTINVA}} \\ \hline
+        \languageline{statement}{\texttt{CONTINVA}} \\
+        \languageline{statement}{\textit{try-statement}} \\ \hline
+
+        \languageline{try-statement}{\texttt{TEMPTA} \textit{scope} \texttt{CAPE} \textbf{id} \textit{scope}} \\ \hline
 
         \languageline{if-statement}{\texttt{SI} \textit{expression} \texttt{TVNC} \textit{scope}} \\
         \languageline{if-statement}{\texttt{SI} \textit{expression} \texttt{TVNC} \textit{scope} \textit{optional-newline} \textit{else-statement}} \\ \hline
@@ -59,6 +62,7 @@
         \languageline{expression}{\texttt{FVNCTIO} \texttt{(} \textit{optional-ids} \texttt{)} \texttt{VT} \textit{scope}} \\
         \languageline{expression}{\textit{literal}} \\
         \languageline{expression}{\textit{expression} \texttt{[} \textit{expression} \texttt{]}} \\
+        \languageline{expression}{\textit{expression} \texttt{[} \textit{expression} \texttt{VSQVE} \textit{expression} \texttt{]} \textnormal{\small\ (inclusive slice)}} \\
         \languageline{expression}{\textit{expression} \textbf{binop} \textit{expression}} \\
         \languageline{expression}{\textbf{unop} \textit{expression}} \\ \hline
         \languageline{literal}{\textbf{string}} \\
@@ -66,7 +70,7 @@
         \languageline{literal}{\textbf{numeral}} \\
         \languageline{literal}{\textbf{bool}} \\
         \languageline{literal}{\texttt{[} \textit{optional-expressions} \texttt{]}} \\
-        \languageline{literal}{\texttt{[} \textit{expression} \texttt{VSQVE} \textit{expression} \texttt{]}} \\
+        \languageline{literal}{\texttt{[} \textit{expression} \texttt{VSQVE} \textit{expression} \texttt{]} \textnormal{\small\ (inclusive on both ends)}} \\
         \languageline{literal}{\texttt{TABVLA} \texttt{\{} \textit{optional-dict-items} \texttt{\}}} \\ \hline
 
         \languageline{optional-dict-items}{\textit{dict-items}} \\
@@ -94,10 +98,10 @@
 \newpage
 \begin{itemize}
   \item \textbf{newline}: \\ Newlines are combined, so a single newline is the same as multiple.
-  \item \textbf{module-name}: \\ Modules are flags given to the interpreter/compiler, to let it know you want to be using certain rules, functions, or features.
+  \item \textbf{module-name}: \\ Modules are flags given to the interpreter/compiler, to let it know you want to be using certain rules, functions, or features. Available modules: \texttt{FORS} (randomness), \texttt{FRACTIO} (fractions), \texttt{MAGNVM} (large integers), \texttt{SCRIPTA} (file I/O: \texttt{LEGE}, \texttt{SCRIBE}, \texttt{ADIVNGE}), \texttt{SVBNVLLA} (negative literals).
   \item \textbf{id}: \\ Variable. Can only consist of lowercase characters and underscores, but not the letters j, u, or w.
   \item \textbf{builtin}: \\ Builtin functions are uppercase latin words.
-  \item \textbf{string}: \\ Any text encased in \texttt{"} or \texttt{'} characters. Single-quoted strings are always literal.
+  \item \textbf{string}: \\ Any text encased in \texttt{"} or \texttt{'} characters. Single-quoted strings are always literal. Strings support 1-based indexing (\texttt{string[I]}) and inclusive slicing (\texttt{string[I VSQVE III]}), returning single-character strings and substrings respectively.
   \item \textbf{interpolated-string}: \\ A double-quoted string containing \texttt{\{}\textit{expression}\texttt{\}} segments. Each expression is evaluated and coerced to a string. Use \texttt{\{\{} and \texttt{\}\}} for literal braces.
   \item \textbf{numeral}: \\ Roman numerals consisting of the uppercase characters I, V, X, L, C, D, and M. Can also include underscore if the module MAGNVM.
   \item \textbf{bool}: \\ VERITAS or FALSITAS.

snippets/array_slice.cent

@@ -0,0 +1,2 @@
+DESIGNA x VT [X, XX, XXX, XL, L]
+DICE(x[II VSQVE IV])

snippets/destructure_array.cent

@@ -0,0 +1 @@
+DESIGNA a, b, c VT [I, II, III]

snippets/destructure_fn.cent

@@ -0,0 +1,2 @@
+DEFINI pair (a, b) VT { REDI (a, b) }
+DESIGNA x, y VT INVOCA pair (III, VII)

snippets/dict_access.cent

@@ -0,0 +1,3 @@
+DICE(d["nomen"])
+DESIGNA d["aetas"] VT XXVI
+DESIGNA d["novus"] VT I

snippets/dict_create.cent

@@ -0,0 +1 @@
+DESIGNA d VT TABVLA {"nomen" VT "Marcus", "aetas" VT XXV}

snippets/dict_per.cent

@@ -0,0 +1,3 @@
+PER k IN d FACE {
+    DICE(k)
+}

snippets/string_interp.cent

@@ -0,0 +1,4 @@
+DESIGNA nomen VT "Marcus"
+DICE("Salve, {nomen}!")
+DICE("Sum: {III + IV}")
+DICE("{nomen} has {V} cats")

snippets/syntaxes/centvrion.sublime-syntax

@@ -9,8 +9,8 @@ contexts:
   main:
     - include: comments
     - include: strings
-    - include: fractions
     - include: keywords
+    - include: fractions
     - include: numerals
     - include: constants
     - include: builtins
@@ -70,15 +70,15 @@ contexts:
       scope: constant.language.centvrion
 
   builtins:
-    - match: '\b(AVDI_NVMERVS|AVDI|CLAVES|DECIMATIO|DICE|EVERRO|FORTIS_NVMERVS|FORTIS_ELECTIONIS|LONGITVDO|SEMEN|SENATVS)\b'
+    - match: '\b(ADIVNGE|AVDI_NVMERVS|AVDI|CLAVES|DECIMATIO|DICE|EVERRO|FORTIS_NVMERVS|FORTIS_ELECTIONIS|LEGE|LONGITVDO|ORDINA|SCRIBE|SEMEN|SENATVS)\b'
       scope: support.function.builtin.centvrion
 
   modules:
-    - match: '\b(FORS|FRACTIO|MAGNVM|SVBNVLLA)\b'
+    - match: '\b(FORS|FRACTIO|MAGNVM|SCRIPTA|SVBNVLLA)\b'
       scope: support.class.module.centvrion
 
   keywords:
-    - match: '\b(AETERNVM|ALVID|AVGE|AVT|CONTINVA|DEFINI|DESIGNA|DISPAR|DONICVM|DVM|ERVMPE|EST|ET|FACE|FVNCTIO|INVOCA|IN|MINVE|MINVS|NON|PER|PLVS|REDI|RELIQVVM|SI|TABVLA|TVNC|VSQVE|VT|CVM)\b'
+    - match: '\b(AETERNVM|ALVID|AVGE|AVT|CAPE|CONTINVA|DEFINI|DESIGNA|DISPAR|DONICVM|DVM|ERVMPE|EST|ET|FACE|FVNCTIO|INVOCA|IN|MINVE|MINVS|NON|PER|PLVS|REDI|RELIQVVM|SI|TABVLA|TEMPTA|TVNC|VSQVE|VT|CVM)\b'
       scope: keyword.control.centvrion
 
   operators:

tests.py

@@ -2,6 +2,7 @@ import os
 import random
 import subprocess
 import tempfile
+import time
 import unittest
 from io import StringIO
 from unittest.mock import patch
@@ -10,12 +11,12 @@ from parameterized import parameterized
 from fractions import Fraction
 
 from centvrion.ast_nodes import (
-  ArrayIndex, Bool, BinOp, BuiltIn, DataArray, DataDict, DataRangeArray,
+  ArrayIndex, ArraySlice, Bool, BinOp, BuiltIn, DataArray, DataDict, DataRangeArray,
   Defini, Continva, Designa, DesignaDestructure, DesignaIndex, DumStatement,
   Erumpe, ExpressionStatement, Fvnctio, ID, InterpolatedString, Invoca,
   ModuleCall, Nullus, Numeral, PerStatement, Program, Redi, SiStatement,
-  String, UnaryMinus, UnaryNot, Fractio, frac_to_fraction, fraction_to_frac,
+  String, TemptaStatement, UnaryMinus, UnaryNot, Fractio, frac_to_fraction,
-  num_to_int, int_to_num, make_string,
+  fraction_to_frac, num_to_int, int_to_num, make_string,
 )
 from centvrion.compiler.emitter import compile_program
 from centvrion.errors import CentvrionError
@@ -283,13 +284,13 @@ assignment_tests = [
                  Designa(ID("x"), BinOp(ID("x"), BinOp(Numeral("II"), Numeral("III"), "SYMBOL_PLUS"), "SYMBOL_PLUS")),
                  ExpressionStatement(ID("x"))]),
     ValInt(6)),
-  # AVGE inside a loop (DONICVM range is exclusive of upper bound: I VSQVE III = [1, 2])
+  # AVGE inside a loop (DONICVM range is inclusive: I VSQVE III = [1, 2, 3])
   ("DESIGNA s VT NVLLVS\nDONICVM i VT I VSQVE III FACE {\ns AVGE i\n}\ns",
     Program([], [Designa(ID("s"), Nullus()),
                  PerStatement(DataRangeArray(Numeral("I"), Numeral("III")), ID("i"),
                    [Designa(ID("s"), BinOp(ID("s"), ID("i"), "SYMBOL_PLUS"))]),
                  ExpressionStatement(ID("s"))]),
-    ValInt(3)),
+    ValInt(6)),
 ]
 
 class TestAssignment(unittest.TestCase):
@@ -469,7 +470,7 @@ control_tests = [
   # DONICVM range loop
   ("DONICVM i VT I VSQVE V FACE { DICE(i) }",
     Program([], [PerStatement(DataRangeArray(Numeral("I"), Numeral("V")), ID("i"), [ExpressionStatement(BuiltIn("DICE", [ID("i")]))])]),
-    ValStr("IV"), "I\nII\nIII\nIV\n"),
+    ValStr("V"), "I\nII\nIII\nIV\nV\n"),
 ]
 
 class TestControl(unittest.TestCase):
@@ -567,6 +568,44 @@ builtin_tests = [
   ("SENATVS([FALSITAS, FALSITAS, VERITAS])", Program([], [ExpressionStatement(BuiltIn("SENATVS", [DataArray([Bool(False), Bool(False), Bool(True)])]))]), ValBool(False)),
   # SENATVS: array input, empty → FALSITAS
   ("SENATVS([])", Program([], [ExpressionStatement(BuiltIn("SENATVS", [DataArray([])]))]), ValBool(False)),
+  # ORDINA: sort integers
+  ("ORDINA([III, I, II])", Program([], [ExpressionStatement(BuiltIn("ORDINA", [DataArray([Numeral("III"), Numeral("I"), Numeral("II")])]))]), ValList([ValInt(1), ValInt(2), ValInt(3)])),
+  # ORDINA: sort strings
+  ('ORDINA(["c", "a", "b"])', Program([], [ExpressionStatement(BuiltIn("ORDINA", [DataArray([String("c"), String("a"), String("b")])]))]), ValList([ValStr("a"), ValStr("b"), ValStr("c")])),
+  # ORDINA: empty list
+  ("ORDINA([])", Program([], [ExpressionStatement(BuiltIn("ORDINA", [DataArray([])]))]), ValList([])),
+  # ORDINA: single element
+  ("ORDINA([V])", Program([], [ExpressionStatement(BuiltIn("ORDINA", [DataArray([Numeral("V")])]))]), ValList([ValInt(5)])),
+  # ORDINA: already sorted
+  ("ORDINA([I, II, III])", Program([], [ExpressionStatement(BuiltIn("ORDINA", [DataArray([Numeral("I"), Numeral("II"), Numeral("III")])]))]), ValList([ValInt(1), ValInt(2), ValInt(3)])),
+  # ORDINA: duplicates
+  ("ORDINA([II, I, II])", Program([], [ExpressionStatement(BuiltIn("ORDINA", [DataArray([Numeral("II"), Numeral("I"), Numeral("II")])]))]), ValList([ValInt(1), ValInt(2), ValInt(2)])),
+  # ORDINA: negative numbers
+  ("CVM SVBNVLLA\nORDINA([-II, III, -I])", Program([ModuleCall("SVBNVLLA")], [ExpressionStatement(BuiltIn("ORDINA", [DataArray([UnaryMinus(Numeral("II")), Numeral("III"), UnaryMinus(Numeral("I"))])]))]), ValList([ValInt(-2), ValInt(-1), ValInt(3)])),
+  # ORDINA: fractions only
+  ("CVM FRACTIO\nORDINA([IIIS, S, IIS])", Program([ModuleCall("FRACTIO")], [ExpressionStatement(BuiltIn("ORDINA", [DataArray([Fractio("IIIS"), Fractio("S"), Fractio("IIS")])]))]), ValList([ValFrac(Fraction(1, 2)), ValFrac(Fraction(5, 2)), ValFrac(Fraction(7, 2))])),
+  # ORDINA: mixed integers and fractions
+  ("CVM FRACTIO\nORDINA([III, S, II])", Program([ModuleCall("FRACTIO")], [ExpressionStatement(BuiltIn("ORDINA", [DataArray([Numeral("III"), Fractio("S"), Numeral("II")])]))]), ValList([ValFrac(Fraction(1, 2)), ValInt(2), ValInt(3)])),
+  # ORDINA: array passed via variable
+  ("DESIGNA x VT [III, I, II]\nORDINA(x)", Program([], [Designa(ID("x"), DataArray([Numeral("III"), Numeral("I"), Numeral("II")])), ExpressionStatement(BuiltIn("ORDINA", [ID("x")]))]), ValList([ValInt(1), ValInt(2), ValInt(3)])),
+  # TYPVS: integer
+  ("TYPVS(V)", Program([], [ExpressionStatement(BuiltIn("TYPVS", [Numeral("V")]))]), ValStr("NVMERVS")),
+  # TYPVS: string
+  ('TYPVS("hello")', Program([], [ExpressionStatement(BuiltIn("TYPVS", [String("hello")]))]), ValStr("LITTERA")),
+  # TYPVS: boolean
+  ("TYPVS(VERITAS)", Program([], [ExpressionStatement(BuiltIn("TYPVS", [Bool(True)]))]), ValStr("VERAX")),
+  # TYPVS: list
+  ("TYPVS([I, II])", Program([], [ExpressionStatement(BuiltIn("TYPVS", [DataArray([Numeral("I"), Numeral("II")])]))]), ValStr("CATALOGVS")),
+  # TYPVS: empty list
+  ("TYPVS([])", Program([], [ExpressionStatement(BuiltIn("TYPVS", [DataArray([])]))]), ValStr("CATALOGVS")),
+  # TYPVS: fraction
+  ("CVM FRACTIO\nTYPVS(S)", Program([ModuleCall("FRACTIO")], [ExpressionStatement(BuiltIn("TYPVS", [Fractio("S")]))]), ValStr("FRACTIO")),
+  # TYPVS: dict
+  ("TYPVS(TABVLA {})", Program([], [ExpressionStatement(BuiltIn("TYPVS", [DataDict([])]))]), ValStr("TABVLA")),
+  # TYPVS: function
+  ("TYPVS(FVNCTIO () VT { REDI(I) })", Program([], [ExpressionStatement(BuiltIn("TYPVS", [Fvnctio([], [Redi([Numeral("I")])])]))]), ValStr("FVNCTIO")),
+  # TYPVS: null
+  ("TYPVS(NVLLVS)", Program([], [ExpressionStatement(BuiltIn("TYPVS", [Nullus()]))]), ValStr("NVLLVS")),
 ]
 
 class TestBuiltins(unittest.TestCase):
@@ -600,6 +639,10 @@ error_tests = [
   ("I * \"hello\"", CentvrionError),                                   # multiplication with string
   ("\"hello\" MINVS \"world\"", CentvrionError),                       # comparison with strings
   ("I[I]", CentvrionError),                                           # indexing a non-array
+  ('"SALVTE"[VII]', CentvrionError),                                   # string index out of range
+  ('"SALVTE"[NVLLVS]', CentvrionError),                                # string index with non-integer
+  ('"SALVTE"[II VSQVE VII]', CentvrionError),                          # string slice out of range
+  ('"SALVTE"[III VSQVE II]', CentvrionError),                          # string slice from > to
   ("DESIGNA x VT I\nDESIGNA x[I] VT II", CentvrionError),             # index-assign to non-array
   ("SEMEN(I)", CentvrionError),                                        # requires FORS module
   ('CVM FORS\nSEMEN("abc")', CentvrionError),                          # SEMEN requires integer seed
@@ -610,9 +653,15 @@ error_tests = [
   ("DECIMATIO([I, II, III])", CentvrionError),                          # FORS required for DECIMATIO
   ("CVM FORS\nDECIMATIO(I)", CentvrionError),                          # DECIMATIO requires an array
   ("LONGITVDO(I)", CentvrionError),                                    # LONGITVDO on non-array
+  ("ORDINA(I)", CentvrionError),                                       # ORDINA on non-array
+  ('ORDINA([I, "a"])', CentvrionError),                                # ORDINA mixed types
+  ("DESIGNA x VT I\nORDINA(x)", CentvrionError),                       # ORDINA on id (non-array)
   ("SENATVS(I)", CentvrionError),                                      # SENATVS requires booleans
   ("SENATVS(VERITAS, I)", CentvrionError),                             # SENATVS mixed types
   ("SENATVS([I, II, III])", CentvrionError),                           # SENATVS array of non-bools
+  ('LEGE("x.txt")', CentvrionError),                                    # SCRIPTA required for LEGE
+  ('SCRIBE("x.txt", "hi")', CentvrionError),                            # SCRIPTA required for SCRIBE
+  ('ADIVNGE("x.txt", "hi")', CentvrionError),                           # SCRIPTA required for ADIVNGE
   ("DESIGNA x VT I\nINVOCA x ()", CentvrionError),                     # invoking a non-function
   ("SI I TVNC { DESIGNA r VT I }", CentvrionError),                    # non-bool SI condition: int
   ("IIIS", CentvrionError),                                            # fraction without FRACTIO module
@@ -628,6 +677,16 @@ error_tests = [
   ("DESIGNA a, b VT III", CentvrionError),                                 # destructure non-array
   ("DESIGNA a, b VT [I]", CentvrionError),                                # destructure length mismatch: too many targets
   ("DESIGNA a, b VT [I, II, III]", CentvrionError),                       # destructure length mismatch: too few targets
+  ("[I, II, III][II VSQVE IV]", CentvrionError),                           # slice upper bound out of range
+  ("[I, II, III][NVLLVS VSQVE II]", CentvrionError),                      # slice with non-integer bound
+  ("I[I VSQVE II]", CentvrionError),                                      # slice on non-array
+  ("[I, II, III][III VSQVE I]", CentvrionError),                           # slice from > to
+  ("CVM SVBNVLLA\n[I, II, III][-I VSQVE II]", CentvrionError),            # slice with negative lower bound
+  ("CVM SVBNVLLA\n[I, II, III][I VSQVE -I]", CentvrionError),             # slice with negative upper bound
+  ("CVM FRACTIO\n[I, II, III][IIIS VSQVE III]", CentvrionError),          # slice with fractional lower bound
+  ("CVM FRACTIO\n[I, II, III][I VSQVE IIIS]", CentvrionError),            # slice with fractional upper bound
+  ("CVM FRACTIO\n[I, II, III][I / II VSQVE III]", CentvrionError),        # slice with division-fraction lower bound
+  ("TEMPTA {\nDESIGNA x VT I / NVLLVS\n} CAPE e {\nDESIGNA y VT I / NVLLVS\n}", CentvrionError),  # uncaught error in catch block propagates
 ]
 
 class TestErrors(unittest.TestCase):
@@ -1146,10 +1205,10 @@ class TestFunctionEdge(unittest.TestCase):
 # --- Loop edge cases ---
 
 loop_edge_tests = [
-  # range(3, 3) is empty — body never runs, program returns ValNul
+  # [III VSQVE III] = [3] — single iteration
   ("DONICVM i VT III VSQVE III FACE { DICE(i) }",
     Program([], [PerStatement(DataRangeArray(Numeral("III"), Numeral("III")), ID("i"), [ExpressionStatement(BuiltIn("DICE", [ID("i")]))])]),
-    ValNul(), ""),
+    ValStr("III"), "III\n"),
   # empty array — body never runs
   ("PER i IN [] FACE { DICE(i) }",
     Program([], [PerStatement(DataArray([]), ID("i"), [ExpressionStatement(BuiltIn("DICE", [ID("i")]))])]),
@@ -1233,7 +1292,7 @@ loop_edge_tests = [
       ExpressionStatement(ID("cnt")),
     ]),
     ValInt(3), ""),
-  # DONICVM with CONTINVA: skip value III, count remaining
+  # DONICVM with CONTINVA: skip value III, count remaining (I VSQVE IV = [1,2,3,4], skip 3 → 3 increments)
   ("DESIGNA cnt VT I\nDONICVM i VT I VSQVE IV FACE {\nSI i EST III TVNC { CONTINVA }\nDESIGNA cnt VT cnt + I\n}\ncnt",
     Program([], [
       Designa(ID("cnt"), Numeral("I")),
@@ -1245,7 +1304,7 @@ loop_edge_tests = [
       ),
       ExpressionStatement(ID("cnt")),
     ]),
-    ValInt(3)),
+    ValInt(4)),
   # DVM condition true from start — body never runs
   ("DESIGNA x VT I\nDVM VERITAS FACE {\nDESIGNA x VT x + I\n}\nx",
     Program([], [
@@ -1254,10 +1313,21 @@ loop_edge_tests = [
       ExpressionStatement(ID("x")),
     ]),
     ValInt(1), ""),
-  # single iteration: [I VSQVE II] = [1]
+  # two iterations: [I VSQVE II] = [1, 2]
   ("DONICVM i VT I VSQVE II FACE { DICE(i) }",
     Program([], [PerStatement(DataRangeArray(Numeral("I"), Numeral("II")), ID("i"), [ExpressionStatement(BuiltIn("DICE", [ID("i")]))])]),
+    ValStr("II"), "I\nII\n"),
+  # single iteration: [I VSQVE I] = [1]
+  ("DONICVM i VT I VSQVE I FACE { DICE(i) }",
+    Program([], [PerStatement(DataRangeArray(Numeral("I"), Numeral("I")), ID("i"), [ExpressionStatement(BuiltIn("DICE", [ID("i")]))])]),
     ValStr("I"), "I\n"),
+  # empty range: [V VSQVE I] = []
+  ("DESIGNA x VT NVLLVS\nDONICVM i VT V VSQVE I FACE { DESIGNA x VT x + i }\nx",
+    Program([], [Designa(ID("x"), Nullus()),
+                 PerStatement(DataRangeArray(Numeral("V"), Numeral("I")), ID("i"),
+                   [Designa(ID("x"), BinOp(ID("x"), ID("i"), "SYMBOL_PLUS"))]),
+                 ExpressionStatement(ID("x"))]),
+    ValNul(), ""),
 ]
 
 class TestLoopEdge(unittest.TestCase):
@@ -1382,7 +1452,7 @@ array_index_tests = [
     Program([], [Designa(ID("a"), DataArray([Numeral("X"), Numeral("XX"), Numeral("XXX")])), ExpressionStatement(ArrayIndex(ID("a"), Numeral("II")))]),
     ValInt(20)),  # second element
   # index into range array
-  ("[I VSQVE V][II]", Program([], [ExpressionStatement(ArrayIndex(DataRangeArray(Numeral("I"), Numeral("V")), Numeral("II")))]), ValInt(2)),      # second element of [1,2,3,4]
+  ("[I VSQVE V][II]", Program([], [ExpressionStatement(ArrayIndex(DataRangeArray(Numeral("I"), Numeral("V")), Numeral("II")))]), ValInt(2)),      # second element of [1,2,3,4,5]
   # expression as index
   ("[I, II, III][I + I]",
     Program([], [ExpressionStatement(ArrayIndex(
@@ -1461,6 +1531,145 @@ class TestArrayIndexAssign(unittest.TestCase):
     run_test(self, source, nodes, value)
 
 
+# --- Array slicing ---
+
+array_slice_tests = [
+  # basic slice from middle
+  ("[X, XX, XXX, XL, L][II VSQVE IV]",
+    Program([], [ExpressionStatement(ArraySlice(
+      DataArray([Numeral("X"), Numeral("XX"), Numeral("XXX"), Numeral("XL"), Numeral("L")]),
+      Numeral("II"), Numeral("IV")))]),
+    ValList([ValInt(20), ValInt(30), ValInt(40)])),
+  # slice of length 1
+  ("[I, II, III][II VSQVE II]",
+    Program([], [ExpressionStatement(ArraySlice(
+      DataArray([Numeral("I"), Numeral("II"), Numeral("III")]),
+      Numeral("II"), Numeral("II")))]),
+    ValList([ValInt(2)])),
+  # full array slice
+  ("[I, II, III][I VSQVE III]",
+    Program([], [ExpressionStatement(ArraySlice(
+      DataArray([Numeral("I"), Numeral("II"), Numeral("III")]),
+      Numeral("I"), Numeral("III")))]),
+    ValList([ValInt(1), ValInt(2), ValInt(3)])),
+  # slice on variable
+  ("DESIGNA a VT [I, II, III, IV, V]\na[II VSQVE IV]",
+    Program([], [
+      Designa(ID("a"), DataArray([Numeral("I"), Numeral("II"), Numeral("III"), Numeral("IV"), Numeral("V")])),
+      ExpressionStatement(ArraySlice(ID("a"), Numeral("II"), Numeral("IV"))),
+    ]),
+    ValList([ValInt(2), ValInt(3), ValInt(4)])),
+  # slice then index (chained)
+  ("[I, II, III, IV][I VSQVE III][II]",
+    Program([], [ExpressionStatement(ArrayIndex(
+      ArraySlice(
+        DataArray([Numeral("I"), Numeral("II"), Numeral("III"), Numeral("IV")]),
+        Numeral("I"), Numeral("III")),
+      Numeral("II")))]),
+    ValInt(2)),
+  # slice on range array
+  ("[I VSQVE X][III VSQVE VII]",
+    Program([], [ExpressionStatement(ArraySlice(
+      DataRangeArray(Numeral("I"), Numeral("X")),
+      Numeral("III"), Numeral("VII")))]),
+    ValList([ValInt(3), ValInt(4), ValInt(5), ValInt(6), ValInt(7)])),
+  # expression as slice bounds
+  ("[I, II, III, IV, V][I + I VSQVE II + II]",
+    Program([], [ExpressionStatement(ArraySlice(
+      DataArray([Numeral("I"), Numeral("II"), Numeral("III"), Numeral("IV"), Numeral("V")]),
+      BinOp(Numeral("I"), Numeral("I"), "SYMBOL_PLUS"),
+      BinOp(Numeral("II"), Numeral("II"), "SYMBOL_PLUS")))]),
+    ValList([ValInt(2), ValInt(3), ValInt(4)])),
+]
+
+class TestArraySlice(unittest.TestCase):
+  @parameterized.expand(array_slice_tests)
+  def test_array_slice(self, source, nodes, value):
+    run_test(self, source, nodes, value)
+
+
+# --- String indexing ---
+
+string_index_tests = [
+  # first character
+  ('"SALVTE"[I]',
+    Program([], [ExpressionStatement(ArrayIndex(String("SALVTE"), Numeral("I")))]),
+    ValStr("S")),
+  # last character
+  ('"SALVTE"[VI]',
+    Program([], [ExpressionStatement(ArrayIndex(String("SALVTE"), Numeral("VI")))]),
+    ValStr("E")),
+  # middle character
+  ('"SALVTE"[III]',
+    Program([], [ExpressionStatement(ArrayIndex(String("SALVTE"), Numeral("III")))]),
+    ValStr("L")),
+  # string index via variable
+  ('DESIGNA s VT "SALVTE"\ns[II]',
+    Program([], [
+      Designa(ID("s"), String("SALVTE")),
+      ExpressionStatement(ArrayIndex(ID("s"), Numeral("II"))),
+    ]),
+    ValStr("A")),
+  # expression as index
+  ('"SALVTE"[I + II]',
+    Program([], [ExpressionStatement(ArrayIndex(
+      String("SALVTE"),
+      BinOp(Numeral("I"), Numeral("II"), "SYMBOL_PLUS")))]),
+    ValStr("L")),
+]
+
+class TestStringIndex(unittest.TestCase):
+  @parameterized.expand(string_index_tests)
+  def test_string_index(self, source, nodes, value):
+    run_test(self, source, nodes, value)
+
+
+# --- String slicing ---
+
+string_slice_tests = [
+  # substring from middle
+  ('"SALVTE"[II VSQVE IV]',
+    Program([], [ExpressionStatement(ArraySlice(
+      String("SALVTE"), Numeral("II"), Numeral("IV")))]),
+    ValStr("ALV")),
+  # full string slice
+  ('"SALVTE"[I VSQVE VI]',
+    Program([], [ExpressionStatement(ArraySlice(
+      String("SALVTE"), Numeral("I"), Numeral("VI")))]),
+    ValStr("SALVTE")),
+  # single-char slice
+  ('"SALVTE"[III VSQVE III]',
+    Program([], [ExpressionStatement(ArraySlice(
+      String("SALVTE"), Numeral("III"), Numeral("III")))]),
+    ValStr("L")),
+  # slice on variable
+  ('DESIGNA s VT "SALVTE"\ns[II VSQVE IV]',
+    Program([], [
+      Designa(ID("s"), String("SALVTE")),
+      ExpressionStatement(ArraySlice(ID("s"), Numeral("II"), Numeral("IV"))),
+    ]),
+    ValStr("ALV")),
+  # chaining: slice then index
+  ('"SALVTE"[I VSQVE III][II]',
+    Program([], [ExpressionStatement(ArrayIndex(
+      ArraySlice(String("SALVTE"), Numeral("I"), Numeral("III")),
+      Numeral("II")))]),
+    ValStr("A")),
+  # expression as slice bounds
+  ('"SALVTE"[I + I VSQVE II + II]',
+    Program([], [ExpressionStatement(ArraySlice(
+      String("SALVTE"),
+      BinOp(Numeral("I"), Numeral("I"), "SYMBOL_PLUS"),
+      BinOp(Numeral("II"), Numeral("II"), "SYMBOL_PLUS")))]),
+    ValStr("ALV")),
+]
+
+class TestStringSlice(unittest.TestCase):
+  @parameterized.expand(string_slice_tests)
+  def test_string_slice(self, source, nodes, value):
+    run_test(self, source, nodes, value)
+
+
 # --- Comments ---
 
 comment_tests = [
@@ -1551,15 +1760,15 @@ scope_tests = [
     ]),
     ValInt(100)),
   # DONICVM: counter holds last range value after loop ends
-  # [I VSQVE IV] = [1,2,3]; last value assigned by loop is III=3
+  # [I VSQVE IV] = [1,2,3,4]; last value assigned by loop is IV=4
   ("DONICVM i VT I VSQVE IV FACE { DESIGNA nop VT I }\ni",
     Program([], [
       PerStatement(DataRangeArray(Numeral("I"), Numeral("IV")), ID("i"), [Designa(ID("nop"), Numeral("I"))]),
       ExpressionStatement(ID("i")),
     ]),
-    ValInt(3)),
+    ValInt(4)),
   # DONICVM: reassigning counter inside body doesn't reduce the number of iterations
-  # range [I VSQVE IV] evaluated once; i reset each time; cnt still increments 3 times → 4
+  # range [I VSQVE IV] evaluated once; i reset each time; cnt still increments 4 times → 5
   ("DESIGNA cnt VT I\nDONICVM i VT I VSQVE IV FACE { DESIGNA cnt VT cnt + I\nDESIGNA i VT C }\ncnt",
     Program([], [
       Designa(ID("cnt"), Numeral("I")),
@@ -1569,7 +1778,7 @@ scope_tests = [
       ]),
       ExpressionStatement(ID("cnt")),
     ]),
-    ValInt(4)),
+    ValInt(5)),
   # DONICVM: ERVMPE exits loop early; counter persists at break value
   ("DONICVM i VT I VSQVE X FACE {\nSI i EST III TVNC { ERVMPE }\n}\ni",
     Program([], [
@@ -2199,5 +2408,357 @@ class TestFvnctio(unittest.TestCase):
     run_test(self, source, nodes, value, output)
 
 
+# --- DORMI ---
+
+dormi_tests = [
+  ("DORMI(NVLLVS)",
+    Program([], [ExpressionStatement(BuiltIn("DORMI", [Nullus()]))]),
+    ValNul()),
+]
+
+class TestDormi(unittest.TestCase):
+  @parameterized.expand(dormi_tests)
+  def test_dormi(self, source, nodes, value, output=""):
+    run_test(self, source, nodes, value, output)
+
+  def test_dormi_timing_int(self):
+    source = "DORMI(I)\n"
+    lexer = Lexer().get_lexer()
+    tokens = lexer.lex(source)
+    program = Parser().parse(tokens)
+
+    start = time.time()
+    program.eval()
+    elapsed = time.time() - start
+    self.assertAlmostEqual(elapsed, 1.0, delta=0.5)
+
+  def test_dormi_timing_int_compiled(self):
+    source = "DORMI(I)\n"
+    lexer = Lexer().get_lexer()
+    tokens = lexer.lex(source)
+    program = Parser().parse(tokens)
+
+    c_source = compile_program(program)
+    with tempfile.NamedTemporaryFile(suffix=".c", delete=False, mode="w") as tmp_c:
+      tmp_c.write(c_source)
+      tmp_c_path = tmp_c.name
+    with tempfile.NamedTemporaryFile(suffix="", delete=False) as tmp_bin:
+      tmp_bin_path = tmp_bin.name
+    try:
+      subprocess.run(
+        ["gcc", "-O2", tmp_c_path, _RUNTIME_C, "-o", tmp_bin_path],
+        check=True, capture_output=True,
+      )
+      start = time.time()
+      proc = subprocess.run([tmp_bin_path], capture_output=True, text=True)
+      elapsed = time.time() - start
+      self.assertEqual(proc.returncode, 0)
+      self.assertAlmostEqual(elapsed, 1.0, delta=0.5)
+    finally:
+      os.unlink(tmp_c_path)
+      os.unlink(tmp_bin_path)
+
+  def test_dormi_timing_frac(self):
+    source = "CVM FRACTIO\nDORMI(S)\n"
+    lexer = Lexer().get_lexer()
+    tokens = lexer.lex(source)
+    program = Parser().parse(tokens)
+
+    start = time.time()
+    program.eval()
+    elapsed = time.time() - start
+    self.assertAlmostEqual(elapsed, 0.5, delta=0.5)
+
+  def test_dormi_timing_frac_compiled(self):
+    source = "CVM FRACTIO\nDORMI(S)\n"
+    lexer = Lexer().get_lexer()
+    tokens = lexer.lex(source)
+    program = Parser().parse(tokens)
+
+    c_source = compile_program(program)
+    with tempfile.NamedTemporaryFile(suffix=".c", delete=False, mode="w") as tmp_c:
+      tmp_c.write(c_source)
+      tmp_c_path = tmp_c.name
+    with tempfile.NamedTemporaryFile(suffix="", delete=False) as tmp_bin:
+      tmp_bin_path = tmp_bin.name
+    try:
+      subprocess.run(
+        ["gcc", "-O2", tmp_c_path, _RUNTIME_C, "-o", tmp_bin_path],
+        check=True, capture_output=True,
+      )
+      start = time.time()
+      proc = subprocess.run([tmp_bin_path], capture_output=True, text=True)
+      elapsed = time.time() - start
+      self.assertEqual(proc.returncode, 0)
+      self.assertAlmostEqual(elapsed, 0.5, delta=0.5)
+    finally:
+      os.unlink(tmp_c_path)
+      os.unlink(tmp_bin_path)
+
+
+class TestScripta(unittest.TestCase):
+  def _run_scripta(self, source):
+    lexer = Lexer().get_lexer()
+    tokens = lexer.lex(source + "\n")
+    program = Parser().parse(tokens)
+    # printer round-trip
+    new_text = program.print()
+    new_tokens = Lexer().get_lexer().lex(new_text + "\n")
+    new_nodes = Parser().parse(new_tokens)
+    self.assertEqual(program, new_nodes, f"Printer test\n{source}\n{new_text}")
+    return program
+
+  def _compile_and_run(self, program):
+    c_source = compile_program(program)
+    with tempfile.NamedTemporaryFile(suffix=".c", delete=False, mode="w") as tmp_c:
+      tmp_c.write(c_source)
+      tmp_c_path = tmp_c.name
+    with tempfile.NamedTemporaryFile(suffix="", delete=False) as tmp_bin:
+      tmp_bin_path = tmp_bin.name
+    try:
+      subprocess.run(
+        ["gcc", "-O2", tmp_c_path, _RUNTIME_C, "-o", tmp_bin_path],
+        check=True, capture_output=True,
+      )
+      proc = subprocess.run([tmp_bin_path], capture_output=True, text=True)
+      self.assertEqual(proc.returncode, 0, f"Compiler binary exited non-zero:\n{proc.stderr}")
+      return proc.stdout
+    finally:
+      os.unlink(tmp_c_path)
+      os.unlink(tmp_bin_path)
+
+  def test_scribe_and_lege(self):
+    with tempfile.NamedTemporaryFile(suffix=".txt", delete=False) as f:
+      path = f.name
+    try:
+      source = f'CVM SCRIPTA\nSCRIBE("{path}", "SALVE MVNDE")\nDICE(LEGE("{path}"))'
+      program = self._run_scripta(source)
+      captured = StringIO()
+      with patch("sys.stdout", captured):
+        program.eval()
+      self.assertEqual(captured.getvalue(), "SALVE MVNDE\n")
+      with open(path) as f:
+        self.assertEqual(f.read(), "SALVE MVNDE")
+    finally:
+      if os.path.exists(path):
+        os.unlink(path)
+
+  def test_scribe_and_lege_compiled(self):
+    with tempfile.NamedTemporaryFile(suffix=".txt", delete=False) as f:
+      path = f.name
+    try:
+      source = f'CVM SCRIPTA\nSCRIBE("{path}", "SALVE MVNDE")\nDICE(LEGE("{path}"))'
+      program = self._run_scripta(source)
+      output = self._compile_and_run(program)
+      self.assertEqual(output, "SALVE MVNDE\n")
+      with open(path) as f:
+        self.assertEqual(f.read(), "SALVE MVNDE")
+    finally:
+      if os.path.exists(path):
+        os.unlink(path)
+
+  def test_adivnge(self):
+    with tempfile.NamedTemporaryFile(suffix=".txt", delete=False) as f:
+      path = f.name
+    try:
+      source = f'CVM SCRIPTA\nSCRIBE("{path}", "SALVE")\nADIVNGE("{path}", " MVNDE")\nDICE(LEGE("{path}"))'
+      program = self._run_scripta(source)
+      captured = StringIO()
+      with patch("sys.stdout", captured):
+        program.eval()
+      self.assertEqual(captured.getvalue(), "SALVE MVNDE\n")
+    finally:
+      if os.path.exists(path):
+        os.unlink(path)
+
+  def test_adivnge_compiled(self):
+    with tempfile.NamedTemporaryFile(suffix=".txt", delete=False) as f:
+      path = f.name
+    try:
+      source = f'CVM SCRIPTA\nSCRIBE("{path}", "SALVE")\nADIVNGE("{path}", " MVNDE")\nDICE(LEGE("{path}"))'
+      program = self._run_scripta(source)
+      output = self._compile_and_run(program)
+      self.assertEqual(output, "SALVE MVNDE\n")
+    finally:
+      if os.path.exists(path):
+        os.unlink(path)
+
+  def test_scribe_overwrites(self):
+    with tempfile.NamedTemporaryFile(suffix=".txt", delete=False) as f:
+      path = f.name
+    try:
+      source = f'CVM SCRIPTA\nSCRIBE("{path}", "first")\nSCRIBE("{path}", "second")\nLEGE("{path}")'
+      program = self._run_scripta(source)
+      result = program.eval()
+      self.assertEqual(result, ValStr("second"))
+    finally:
+      if os.path.exists(path):
+        os.unlink(path)
+
+  def test_lege_empty_file(self):
+    with tempfile.NamedTemporaryFile(suffix=".txt", delete=False, mode="w") as f:
+      path = f.name
+    try:
+      source = f'CVM SCRIPTA\nLEGE("{path}")'
+      program = self._run_scripta(source)
+      result = program.eval()
+      self.assertEqual(result, ValStr(""))
+    finally:
+      os.unlink(path)
+
+  def test_lege_preexisting_content(self):
+    with tempfile.NamedTemporaryFile(suffix=".txt", delete=False, mode="w") as f:
+      f.write("hello from python")
+      path = f.name
+    try:
+      source = f'CVM SCRIPTA\nLEGE("{path}")'
+      program = self._run_scripta(source)
+      result = program.eval()
+      self.assertEqual(result, ValStr("hello from python"))
+    finally:
+      os.unlink(path)
+
+  def test_scribe_returns_nullus(self):
+    with tempfile.NamedTemporaryFile(suffix=".txt", delete=False) as f:
+      path = f.name
+    try:
+      source = f'CVM SCRIPTA\nSCRIBE("{path}", "x")'
+      program = self._run_scripta(source)
+      result = program.eval()
+      self.assertEqual(result, ValNul())
+    finally:
+      if os.path.exists(path):
+        os.unlink(path)
+
+  def test_adivnge_returns_nullus(self):
+    with tempfile.NamedTemporaryFile(suffix=".txt", delete=False) as f:
+      path = f.name
+    try:
+      source = f'CVM SCRIPTA\nADIVNGE("{path}", "x")'
+      program = self._run_scripta(source)
+      result = program.eval()
+      self.assertEqual(result, ValNul())
+    finally:
+      if os.path.exists(path):
+        os.unlink(path)
+
+
+# --- Tempta/Cape (try/catch) ---
+
+tempta_tests = [
+  # Try block succeeds — catch not entered
+  (
+    "TEMPTA {\nDESIGNA r VT I\n} CAPE e {\nDESIGNA r VT II\n}\nr",
+    Program([], [
+      TemptaStatement(
+        [Designa(ID("r"), Numeral("I"))],
+        ID("e"),
+        [Designa(ID("r"), Numeral("II"))],
+      ),
+      ExpressionStatement(ID("r")),
+    ]),
+    ValInt(1),
+  ),
+  # Try block errors — caught by catch
+  (
+    "TEMPTA {\nDESIGNA r VT I / NVLLVS\n} CAPE e {\nDESIGNA r VT II\n}\nr",
+    Program([], [
+      TemptaStatement(
+        [Designa(ID("r"), BinOp(Numeral("I"), Nullus(), "SYMBOL_DIVIDE"))],
+        ID("e"),
+        [Designa(ID("r"), Numeral("II"))],
+      ),
+      ExpressionStatement(ID("r")),
+    ]),
+    ValInt(2),
+  ),
+  # Error variable contains the error message
+  (
+    'DESIGNA e VT NVLLVS\nTEMPTA {\nDESIGNA r VT I / NVLLVS\n} CAPE e {\nNVLLVS\n}\ne',
+    Program([], [
+      Designa(ID("e"), Nullus()),
+      TemptaStatement(
+        [Designa(ID("r"), BinOp(Numeral("I"), Nullus(), "SYMBOL_DIVIDE"))],
+        ID("e"),
+        [ExpressionStatement(Nullus())],
+      ),
+      ExpressionStatement(ID("e")),
+    ]),
+    ValStr("Division by zero"),
+  ),
+  # Nested tempta — inner catches, outer unaffected
+  (
+    "DESIGNA r VT NVLLVS\nTEMPTA {\nTEMPTA {\nDESIGNA r VT I / NVLLVS\n} CAPE e {\nDESIGNA r VT I\n}\n} CAPE e {\nDESIGNA r VT II\n}\nr",
+    Program([], [
+      Designa(ID("r"), Nullus()),
+      TemptaStatement(
+        [TemptaStatement(
+          [Designa(ID("r"), BinOp(Numeral("I"), Nullus(), "SYMBOL_DIVIDE"))],
+          ID("e"),
+          [Designa(ID("r"), Numeral("I"))],
+        )],
+        ID("e"),
+        [Designa(ID("r"), Numeral("II"))],
+      ),
+      ExpressionStatement(ID("r")),
+    ]),
+    ValInt(1),
+  ),
+  # REDI inside catch block
+  (
+    "DEFINI f () VT {\nTEMPTA {\nDESIGNA x VT I / NVLLVS\n} CAPE e {\nREDI (III)\n}\nREDI (IV)\n}\nINVOCA f ()",
+    Program([], [
+      Defini(ID("f"), [], [
+        TemptaStatement(
+          [Designa(ID("x"), BinOp(Numeral("I"), Nullus(), "SYMBOL_DIVIDE"))],
+          ID("e"),
+          [Redi([Numeral("III")])],
+        ),
+        Redi([Numeral("IV")]),
+      ]),
+      ExpressionStatement(Invoca(ID("f"), [])),
+    ]),
+    ValInt(3),
+  ),
+  # ERVMPE inside catch block (inside a loop)
+  (
+    "DESIGNA r VT NVLLVS\nDVM r EST I FACE {\nTEMPTA {\nDESIGNA x VT I / NVLLVS\n} CAPE e {\nDESIGNA r VT I\nERVMPE\n}\n}\nr",
+    Program([], [
+      Designa(ID("r"), Nullus()),
+      DumStatement(
+        BinOp(ID("r"), Numeral("I"), "KEYWORD_EST"),
+        [TemptaStatement(
+          [Designa(ID("x"), BinOp(Numeral("I"), Nullus(), "SYMBOL_DIVIDE"))],
+          ID("e"),
+          [Designa(ID("r"), Numeral("I")), Erumpe()],
+        )],
+      ),
+      ExpressionStatement(ID("r")),
+    ]),
+    ValInt(1),
+  ),
+  # Statement after error in try block is not executed
+  (
+    "DESIGNA r VT NVLLVS\nTEMPTA {\nDESIGNA x VT I / NVLLVS\nDESIGNA r VT III\n} CAPE e {\nDESIGNA r VT II\n}\nr",
+    Program([], [
+      Designa(ID("r"), Nullus()),
+      TemptaStatement(
+        [Designa(ID("x"), BinOp(Numeral("I"), Nullus(), "SYMBOL_DIVIDE")),
+         Designa(ID("r"), Numeral("III"))],
+        ID("e"),
+        [Designa(ID("r"), Numeral("II"))],
+      ),
+      ExpressionStatement(ID("r")),
+    ]),
+    ValInt(2),
+  ),
+]
+
+class TestTempta(unittest.TestCase):
+  @parameterized.expand(tempta_tests)
+  def test_tempta(self, source, nodes, value, output=""):
+    run_test(self, source, nodes, value, output)
+
+
 if __name__ == "__main__":
   unittest.main()