changelog.md (0133bd2) - rtensor

changelog.md

# RTensor/VeCalc/maths_parser changelog

## 0.1

* make five basic binary operators
* make lexer
* attempt left-recursive parser. fail miserably.
* remove left-recursion
* make right-recursive parser. succeed (but it's ugly).
* add support for radix-pointed numeric literals
* add method for handling associativity
* make parsetree to ast converter
* implement ast evaluation

## 0.2

* add parentheticals
* add assignment
* add postfix output
* add unary operationss
* improve vecalc independently of parser (semicolons, error handling, etc)
* add more operators (`-/` and `,`)

## 1.0

* rewrite parser, eliminating parsetree step
* add vector component access syntax ( `(a, b, c)[2] == b` )
* add vector component assignment ( `v[2] = a` ) (lvalue generalisation)
* add function call syntax ( `f()`, `f(x)`, `f(x, y)` )
* add function objects
* add builtin functions in vecalc

## 1.1

* change unary operator parsing
* fix index-suffix parsing bug
* fix vector-element-assignment bug
* add `<` operator
* add functions `floor`, `len`, `any`, and `all` (vecalc, not in parser)
* add functions `if` and `map` (vecalc, not in parser)

## 1.2

* add functions `filter`, `reduce`, and `tail` (vecalc, not in parser)
* add constants `pi` and `phi` (vecalc, not in parser)
* fix vector-indexing bug
* fix other wacky bugs

## 1.3 2021-09-01

* improve empty list handling
* add functions `random`, `zero`, and `clear` (vecalc, not in parser)
* add constants `true` and `false` (vecalc, not in parser)
* add function `for` (vecalc, not in parser)

## 1.4 2021-09-05

* improve evaluation error messages
* further improve empty list handling
* fix bug in `random` function
* demonstrate that vecalc is now sufficiently powerful as to implement quicksort
* make some examples clickable
* try and fail to add an indication that the expression is being evaluated but is not finished

## 1.5 2021-10-01

* finally add a favicon, wow
* warning on closing page
* more examples

## 1.6 2021-11-23

* fix bug in `map` function
* improve `filter` function
* abbreviate saved-answer identifiers
* improve error messages for argument patterns

## 1.7 2021-12-28

* add operator `=>` (maplet, anonymous function)
* enhance function call syntax
* fix bug in function call parsing
* correct inconsistency in `zero` function
* more examples
* improve examples
* fix warning on closing page
* replace PNG file favicon with inline SVG (saves 2.3 kB)

## 1.8 2022-010

* improve error messages for library functions and token errors
* catch long `for` loops
* add functions `trim`, `tostring`, `render`, and `html`
* deprecate `gi` parameter
* split `AST` class from `maths_parser.js` to `maths_ast.js`
* implement syntactic function mechanism
* fix bug in history navigation
* more examples

## 2.0 2022-035

* produce direct characters (rather than references) in `toHTML`
* improvements to `toHTML`
* make `MathsFunc.apply()` API match that of `Function`
* syntax changes, theoretically non-breaking to users (no distinct assignment statements or lvalues, just `=` operator)
* syntax changes, probably breaking (unified `v[i]` syntax with `f(x)` syntax to make `v(i)`, removing `v[i]`)
* update examples to match syntax changes
* add constant `null`
* make function call/vector index syntax more sugary (`f(a)(b)` instead of `(f(a))(b)`)
* properly distinguish scalars from vectors
* add operator `..` (tensor concatenation and ranges)
* allow `'` (prime/apostrophe) in identifiers
* implement multi-argument anonymous functions
* rename from VeCalc to RTensor

## 2.1 2022-081

* split rendering to HTML from `maths_ast.js` to `rtensor_to_html.js`
* split `MathsFunc` definition from `maths_parser.js` to `mathsfunc.js`
* fix `AST.toString()` to invert parsing
* switch to XHTML
* write a separate documentation file (`documentation.md`)
* render comma operations in `toHTML`
* fix bug in parsing numbers with only a fractional component
* make `toHTML` consider derived functions (`sec`, `csc`, `cot`, etc) to be of similar status to actual builtins
* fix parenthesisation of base of exponents in `toHTML`

## 2.2 2022-230

* fix associativity bugs
* allow identifiers starting with `'` (apostrophe)
* allow square brackets for indexing and functions
* treat square-bracket function calls as syntactic
* remove the syntactic function distinction, making all functions call-by-value with an option for the value to be an AST
* add functions `lhs`, `rhs`, and `operator` to access parts of ASTs
* add syntactic-input handler for `if` function
* implement binary operations on ASTs (returns new ASTs)
* add functions `sum` and `product` (expecting syntactic input)

## 2.3-dev 2022-294, 2023-204

* implement complex numbers
* unify numeric types (reals also supported) into query-string-controlled list of types
* implement bigints
* implement arithmetic operations on functions
* fix bug with `sum` and `product` applied to tensors
* add code-loading textbox
* implement syntactic version of `for`
* write library files `linalg.rt`, `polynomial.rt`, `integer.rt`
* add function `latex` to convert AST to LaTeX

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