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| 1 | +# Changelog |
| 2 | + |
| 3 | +## 1.0.1 [2022-02-09] |
| 4 | + |
| 5 | +- ([#122](https://github.com/sugarlabs/musicblocks-v4-lib/pull/122)) |
| 6 | +Added provision to provide initialisation values in snapshot of data elements. |
| 7 | +- ([#119](https://github.com/sugarlabs/musicblocks-v4-lib/pull/119)) |
| 8 | +Added function to **specification** snapshot. |
| 9 | +- ([#121](https://github.com/sugarlabs/musicblocks-v4-lib/pull/121)) |
| 10 | +Removed custom type reliance for element name (`TElementName`). |
| 11 | +- ([#120](https://github.com/sugarlabs/musicblocks-v4-lib/pull/120)) |
| 12 | +Updated package dependencies. |
| 13 | +- ([#118](https://github.com/sugarlabs/musicblocks-v4-lib/pull/118)) |
| 14 | +Added validations in **specification** functions for registering and unregistering _syntax elements_. |
| 15 | + |
| 16 | +## 1.0.0 [2022-01-26] |
| 17 | + |
| 18 | +- Added 3 categories of components: **Syntax Representation**, **Execution Engine**, **Library** |
| 19 | + |
| 20 | + - **Syntax Representation** |
| 21 | + |
| 22 | + - Added **Element API**: represents **syntax elements** -- the atomic constructs for building |
| 23 | + programs. There are 2 kinds of **syntax elements**: |
| 24 | + - **Arguments** which return values. These are of 2 types: |
| 25 | + - **Data** which return a value inherently and without operating on other provided values |
| 26 | + - **Expression** which return a value after operating on other provided values |
| 27 | + - **Instructions** which perform a task. These are of 2 types: |
| 28 | + - **Statements** perform a single task |
| 29 | + - **Blocks** encapsulate _statements_ and generally set some states or control the flow to them |
| 30 | + |
| 31 | + - Added **Specification** component: maintains a table of concrete **syntax elements** which can |
| 32 | + be used to build programs. |
| 33 | + - Added **Warehouse** component: maintains a table of instances of **syntax elements** registered |
| 34 | + in the **specification**. It can also generate statistics about the instances. |
| 35 | + - Added **Syntax Tree** component: represents the _abstract syntax tree_ or _AST_ by maintaining |
| 36 | + interconnections between **syntax elements**. |
| 37 | + |
| 38 | + - **Execution Engine** |
| 39 | + |
| 40 | + - Added **Symbol Table** component: maintains tables of dynamic global variables and states which |
| 41 | + the **syntax elements** can use during execution. |
| 42 | + - Added **Parser** component: parses the **syntax tree** in a postorder sequence, and maintains |
| 43 | + _call frame stacks_ and the _program counter_. |
| 44 | + - Added **Interpreter** component: fetches elements from the **parser** and executes them. |
| 45 | + |
| 46 | + - There are 2 special constructs: **Process** and **Routine**. These are special _block_ elements. |
| 47 | + **Routines** encapsulate _instructions_ that can be executed by multiple **processes**. **Processes** |
| 48 | + encapsulate independent set of _instructions_, and multiple **processes** can run concurrently. |
| 49 | + - There is an additional terminology called **crumbs** which are sets of connected _syntax elements_ |
| 50 | + not part of any _process_ or _routine_. |
| 51 | + |
| 52 | + - **Library** |
| 53 | + |
| 54 | + - Added basic **Concrete Syntax Elements** |
| 55 | + - **Values** |
| 56 | + - Represent stored values |
| 57 | + - Supports `boolean`, `number`, `string` data-types |
| 58 | + - **Boxes** |
| 59 | + - Represents variable values |
| 60 | + - Support `boolean`, `number`, `string`, `generic` data-types |
| 61 | + - **Box Identifiers** |
| 62 | + - Represents variable identifiers |
| 63 | + - Supports `boolean`, `number`, `string`, `generic` **boxes** |
| 64 | + - **Math Operators** |
| 65 | + - `plus`, `minus`, `times`, `divide`, `modulus` operators |
| 66 | + - **Conditionals**: `if` |
| 67 | + - **Loops**: generic `repeat` |
| 68 | + - **Program**: `process` and `routine` |
| 69 | + - **Miscellaneous**: `print` |
| 70 | + - Added a _specification_ of the above **syntax elements** |
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