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editor/editableMathlist

This module contains the definition of a data structure representing a list of math atoms that can be edited. It is an in-memory representation of a mathematical expression whose elements, math atoms, can be removed, inserted or re-arranged. In addition, the data structure keeps track of a selection, which can be either an insertion point — the selection is then said to be collapsed — or a range of atoms.

See EditableMathlist

Methods

parseMathString(s: string)privatestatic

Attempts to parse and interpret a string in an unknown format, possibly ASCIIMath and return a canonical LaTeX string.

The format recognized are one of these variations:

  • ASCIIMath: Only supports a subset (1/2x) 1/2sin x -> \frac {1}{2}\sin x 1/2sinx -> \frac {1}{2}\sin x (1/2sin x (x^(2+1)) // Unbalanced parentheses (1/2sin(x^(2+1)) -> \left(\frac {1}{2}\sin \left(x^{2+1}\right)\right) alpha + (pi)/(4) -> \alpha +\frac {\pi }{4} x=(-b +- sqrt(b^2 – 4ac))/(2a) alpha/beta sqrt2 + sqrtx + sqrt(1+a) + sqrt(1/2) f(x) = x^2 "when" x >= 0 AA n in QQ AA x in RR "," |x| > 0 AA x in RR "," abs(x) > 0

  • UnicodeMath (generated by Microsoft Word): also only supports a subset

    • See https://www.unicode.org/notes/tn28/UTN28-PlainTextMath-v3.1.pdf √(3&x+1) {a+b/c} [a+b/c] a^b x lim(n->\infty) n \iint_(a=0)^\infty a
  • "JavaScript Latex": a variant that is LaTeX, but with escaped backslashes \frac{1}{2} \sin x

s : string

arrayAdjustRow(array: Array.<Array.<MathAtom>>, colRow: object, dir: number)privateinner

Adjust colRow to point to the next/previous available row If no more rows, go to the next/previous column If no more columns, return null

array : Array.<Array.<MathAtom>>
colRow : object
dir : number

arrayCell(array: Array.<Array.<MathAtom>>, colrow: number | string | object)privateinner

Return the array cell corresponding to colrow or null (for example in a sparse array)

array : Array.<Array.<MathAtom>>
colrow : number | string | object

arrayCellCount(array: Array.<Array.<MathAtom>>)privateinner

Total numbers of cells (include sparse cells) in the array.

array : Array.<Array.<MathAtom>>

arrayColRow(array: Array.<Array.<MathAtom>>, index: number | string): objectprivateinner

Convert an array index (scalar) to an array row/col.

array : Array.<Array.<MathAtom>>
index : number | string
: object   
  • row: number
  • col: number

arrayColumnCellCount(array: MathAtom, col: number): numberprivateinner

Return the number of non-empty cells in that column

array : MathAtom
col : number
: number   

arrayFirstCellByRow(array: Array.<Array.<MathAtom>>): stringprivateinner

Return the first non-empty cell, row by row

array : Array.<Array.<MathAtom>>
: string   

arrayIndex(array: Array.<Array.<MathAtom>>, rowCol: object): numberprivateinner

Convert an array row/col into an array index.

array : Array.<Array.<MathAtom>>
rowCol : object
: number   

arrayJoinColumns(row: MathAtom[], separator: string, style: object): MathAtom[]privateinner

Join all the cells at the indicated row into a single mathlist

row : MathAtom[]
separator : string
style : object
: MathAtom[]   

arrayJoinRows(array: MathAtom, separators: strings, style: object): MathAtom[]privateinner

Join all the rows into a single atom list

array : MathAtom
separators : strings
style : object
: MathAtom[]   

arrayRemoveColumn(array: MathAtom, col: number)privateinner

Remove the indicated column from the array

array : MathAtom
col : number

arrayRemoveRow(atom: MathAtom, row: number)privateinner

Remove the indicated row from the array

atom : MathAtom
row : number

atomContains(atom: MathAtom, target: MathAtom): booleanprivateinner

atom : MathAtom
target : MathAtom
: boolean   

True if atom is the target, or if one of the children of atom contains the target

isNumber(atom: object)privateinner

Return true if the atom could be a part of a number i.e. "-12354.568"

atom : object

parseMathArgument(s: string): objectprivateinner

Parse a math argument, as defined by ASCIIMath and UnicodeMath:

  • Either an expression fenced in (), {} or []
  • a number (- sign, digits, decimal point, digits)
  • a single [a-zA-Z] letter (an identifier)
  • a multi-letter shortcut (e.g., pi)
  • a LaTeX command (\pi) (for UnicodeMath)
s : string
: object   
  • match: the parsed (and converted) portion of the string that is an argument
  • rest: the raw, unconverted, rest of the string