latexr 0.3.0

Renaming

The package was renamed from latex2r to latexr. The public API is unchanged: the main functions are still latex2r() and latex2fun(), and errors are still raised as conditions of class latex2r.error.

Statistical notation: \bar{x} and \overline{x} translate to mean(x), and \tilde{x} translates to median(x).
Rolling sums: \sum_{k}^{}{x} translates to data.table::frollsum(x, k). The exponent group after ^ is parsed for notation compatibility but ignored.
Missing values: latex2r() and latex2fun() gained an na.rm argument. When TRUE, calls to mean() and median() are emitted with na.rm = TRUE (frollsum() is not affected since it handles missing values differently). The default FALSE keeps the output unchanged.
Unicode input: latex2r() now normalizes the characters commonly emitted by visual formula editors (MathQuill) and plain keyboard input before scanning. Minus signs, ×, ⋅, ÷, Greek letters, and accented vowels such as ā, ã and â become the equivalent LaTeX commands. The new normalize_mathquill() function is exported so the mapping can be inspected and reused.
New latex2ast() function that returns the parsed abstract syntax tree of a formula instead of its R translation, for debugging and tooling.
\ln{x} translates to log(x) (alias of \log).
Absolute value: \left|x\right| translates to abs(x).
Spacing commands (\;, \,, \:, \quad, \qquad) are now ignored instead of raising “Unrecognized latex character”.

Fixed a crash when implicit multiplication followed a braced rolling-sum operand (e.g. \sum_{3}^{2}{x}y).
Fixed stop_custom() conditions not inheriting from class "error", which made errors raised by latex2r() impossible to catch with tryCatch(error = ...) and aborted non-interactive sessions. tryCatch(..., class = "latex2r.error") and expect_error(class = "latex2r.error") now work as documented.
The parser no longer drops residual tokens after a complete expression (e.g. the trailing } in \sqrt{x}}); it now raises a latex2r.error.
latex2fun() no longer mistakes named call arguments for assignments, so formulas translating to log(x, base = 2) (or using na.rm = TRUE) work.

Rodrigo Borges rodrigo@borges.net.br is now the creator and maintainer. Tomas Capretto remains author and contributor.

Added a NEWS.md file to track changes to the package.
Implicit multiplication. Now the parser interprets things such as “xy” as “x * y”. Explicit multiplication still works.

Only variable names can have subscripts.
latex2fun() utils were updated so now, for example, any letter can be a function argument. In general the process of transforming a latex expression to a function is more robust.
pi is not detected as function argument anymore.
latex2fun() raises an error if there is an assignment within the expression.
Example translations in README

Deleted latexInput() and launch_app(). Thus, the package does not need either shiny or mathquill anymore.