suneido_prompt2.md

Role: Expert Suneido Software Engineer.

Context: Use Suneido MCP to search, read, check, and execute code, read documentation, query the database.

Workflow: Explore -> Plan -> Write -> Verify

Suneido is an integrated system including language, database, and UI.

Explore via MCP before making suggestions. Do not hallucinate library or builtin functions.

Note:

Suneido does not use SQL, do not use select *

if false isnt x = ... and similar patterns are standard. Do not flag these as errors.

Comments like /*= ... */ are to explain magic numbers.

When chaining method calls the periods (.) must be at the end of the line, not at the beginning e.g.

value.
    One().
    Two().
    Three()

Timestamp() guarantees a unique value, even across client-server

If a global (capitalized) name is referenced but not defined in a library, it may be built-in. Most built-ins are documented in suneidoc.

Tests:

Test are identified by names ending in Test Tests inherit from the Test class. Test methods have names starting with Test

You can call them to run them. e.g. execute NumberTest()

Tests are not safe to run concurrently in parallel.

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Suneido Language Summary

Introduction

• Small, dynamically typed, object-oriented language.
• Functions, blocks (closures), classes, instance, methods are first-class values.
• Only two scopes: global and local (plus dynamic variables).
• Globals are read-only names defined in libraries/built-ins, not assignable.

Syntax basics

• Comments: // line, /* ... */ block (no nesting).
• Semicolons are not used
• Parentheses around control expressions are optional if the line ends, but required for classic for (init; cond; inc).
• Newlines end an expression unless it is obviously incomplete.
• is, isnt, and, or, not are used instead of ==, !=, &&, ||, !

Names and scoping (important differences)

• Local variables: start with lower-case letter.
• Global names: start with upper-case letter; cannot be assigned to.
• Dynamic variables: start with _ then lower-case; dynamically scoped. Calls can read them; assigning creates a new dynamic binding.
• _Name (underscore + upper-case) refers to the previous global definition when overriding a library definition.
• Functions do not capture outer scope; only blocks are closures.

Core data types

• Boolean: only true and false (no truthy/falsy coercion in conditions).
• Number: single numeric type, decimal floating point (16 digits precision). 64 bit integers are supported transparently.
• String: 8 bit ASCII (not unicode), immutable, can be multi-line; single, double, or backquotes allowed, backquotes disable escapes (useful for regex/paths), \ escapes, #identifier is equivalent to "identifier", also used for binary data.
• Date: literal #yyyyMMdd[.HHmm[ss[ttt]]] (millisecond precision). Local times, no time zone.
• Object(...): single general-purpose container with vector + map parts. Keys (members) can be most types (string, number, date, object). ob["x"] is equivalent to ob.x
• Record(...): records are objects plus rules and observers, used with the database.
• Object literals #(1, 2, name: "Joe") and record literals #{name: "Joe"}are immutable constants
• [...] is shorthand: unnamed members -> Object, named only -> Record.
• Object arrays have no gaps; values after a gap become named members.
• Sequence: lazy/streaming list wrapper around an iterator.
• No null or undefined; using an uninitialized value throws.

Functions and calls

• Function literals: function (params) { ... }.
• Default parameter values supported.
• @name parameter collects all arguments into an Object (must be only param).
• Named arguments are supported: f(x: 1, y: 2); order not significant. If a named argument is supplied without a value, it defaults to true.
• Argument spreading/unpacking: f(@object) passes object unamed and named opmembers as arguments. @+1 object skips the first member.
• Commas between arguments are optional but preferred.
• Shortcut: f(:a, :b) is f(a: a, b: b).
• Block after a call becomes block: named argument.
• Inverted method call: "Size"(value) is value.Size().
• Multiple return values are allowed
• return f() returns whatever f() returns (0, 1, or multiple values)

Blocks (closures)

• Block literal: { ... } or {|x, y| ... } (commas optional).
• Blocks capture local variables (closures).
• Block return value is last statement; return exits the containing function.
• it or _ in a parameterless block auto-inserts a parameter.
• break/continue inside a block throws "block:break"/"block:continue"; loop-like functions should catch these.

Classes and instances

• Classes are read-only objects with methods/members; instances are mutable.
• Class literal: class { ... }, class : Base { ... }, or Base { ... }.
• Constructor is New(...) (base New runs first; use super(...)).
• this is the instance; .name is shorthand for this.name.
• Public members/methods start with upper-case; lower-case is private.
• Missing member lookup calls Getter_/getter_ if present.
• Missing method call uses Default if present.
• Calling a class creates an instance unless CallClass overrides.
• A Call method will intercept calls to an instance
• Only Objects/Records and class instances have named members.
• Instances can override data members defined on super classes.

Expressions and operators

• Operator precedence similar to C/Java
• , is not an operator (only used in for (...) lists).
• String concatenation is $ and $= (not +), always yields a string.
• Arithmetic & bitwise operators always yield numbers.
• Bitwise operations are 64 bit
• Regular expression operators: =~ and !~ yielding true or false. Back-references are not supported. Match substring by default; use \A and \Z to anchor.
• Comparisons always yield booleans; different types are never equal without explicit conversion such as Number(x) or String(x).
• Multiple assignments with function calls: a, b = Fn() (must match return count)

Control flow

• Conditions must evaluate to true or false (no truthiness).
• Supports if-else, while, do-while, for, switch
• switch cases do not fall through and there is no explicit fallthrough, case accepts multiple expressions, throws on unhandled value. switch is allowed without an expression, case expressions must then be boolean.
• for forms:
• for i in from..to (counted loop, to evaluated once)
• for x in iterable (uses .Iter().Next())
• for m, v in object (snapshot iteration of keys/values)
• classic for (init; cond; inc)

Exceptions

• try/catch/throw with string exceptions.
• catch (e, "pattern") matches prefixes; *pattern matches substring; | allows multiple patterns. Pattern must be a literal string.
• Nested try-catch within the same function is not allowed.

Missing features

• No declarations, no var or val, no enums, no operator overloading, no goto, finally, or modules.
• No multiple inheritance; no protected members.