wapform_lazarus library

The WML tag engine: setvar, expression, condition, invoke, the expand* text functions, DataSetRegistry and DbQuery.

Classes

DataSetRegistry: The datasets of one card, by id (case-insensitive).
DbQuery: Runs SQL for a card (WML <dbquery>): SELECTs become registered datasets.

currentEvaluator → WapEvaluator?: no setter
currentRegistry → DataSetRegistry?: no setter
varChangeHooks → List<void Function(String name)>: @@@ Notification fired when a variable is rewritten by setvar (lets the UI sync the value back into an input field). _varCtl only does one-way sync from "input field → variable". Without this notify-back mechanism, when something like a WML
final

condition(String str) → bool: condition — empty Str → false; returns bool on success, false on failure.
expandSql(String s) → String: Like expandText, for inserting whole SQL fragments ($S); DbQuery.query uses it by default.
expandSqlAuto(String s) → String: Like expandSql, but string values are single-quoted and escaped; numbers are inserted as is.
expandSqlQuoted(String s) → String: Like expandSql, but every value is single-quoted and escaped.
expandText(String s) → String: Expands $name, $(expression) and $$ in s, inserting values as is.
expression(String str, {bool nul = true}) → dynamic: Expression — empty Str → null; returns the value on success, null on failure (prints red-colored ERROR text).
invoke(String instance, String method, {dynamic params, String? result}) → dynamic: invoke — corresponds to WML's
setvar(String name, dynamic value) → void: setvar — corresponds to WML's <setvar name= value=>.
useEngine(WapEvaluator ev, [DataSetRegistry? registry]) → void: Makes ev (and registry) the engine used by setvar, expression, condition, invoke and the expand* functions.