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Math expressions #276
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i solved by doing this, but looks ugly fun String.replaceCodeMarkdown(): String =
replace("```", "`")
.replaceFractions()
.replaceSqrt()
.replaceMathBBToSymbol()
.let {
mathPairs.fold(it) { acc, (pattern, char) ->
acc.replace(pattern, mathString(char))
}
}
private fun mathString(string: String) = string
private fun String.replaceFractions(): String {
val fraction = Regex("\\\\frac\\{([^}]*)\\}\\{([^}]*)\\}")
return fraction.replace(this) { matchResult ->
val numerator = matchResult.groupValues[1]
val denominator = matchResult.groupValues[2]
mathString("$numerator/$denominator")
}
}
private fun String.replaceMathBBToSymbol(): String {
val replacementMap = mapOf(
"A" to "𝔸", "B" to "𝔹", "C" to "ℂ", "D" to "𝔻", "E" to "𝔼",
"F" to "𝔽", "G" to "𝔾", "H" to "ℍ", "I" to "𝕀", "J" to "𝕁",
"K" to "𝕂", "L" to "𝕃", "M" to "𝕄", "N" to "ℕ", "O" to "𝕆",
"P" to "ℙ", "Q" to "ℚ", "R" to "ℝ", "S" to "𝕊", "T" to "𝕋",
"U" to "𝕌", "V" to "𝕍", "W" to "𝕎", "X" to "𝕏", "Y" to "𝕐",
"Z" to "ℤ"
)
val regex = Regex("\\\\mathbb\\{([A-Za-z])\\}")
return regex.replace(this) { matchResult ->
val letter = matchResult.groupValues[1].uppercase()[0].toString()
replacementMap[letter] ?: letter
}
}
private fun String.replaceSqrt(): String {
val sqrt = Regex("\\\\sqrt(?:\\[([^]]+)])?\\{([^}]*)\\}")
return sqrt.replace(this) { matchResult ->
val n = matchResult.groupValues[1].takeIf { it.isNotEmpty() }?.toIntOrNull()
val x = matchResult.groupValues[2]
mathString(n?.let { "(${n})√$x" } ?: "√$x")
}
}
private val mathPairs by lazy {
listOf(
"\\(" to "(",
"\\)" to ")",
"\\[" to "[",
"\\[" to "]",
"\\quad" to " ",
"\\neg" to "¬",
"\\pm" to "±",
"\\mp" to "∓",
"\\div" to "÷",
"\\%" to "%",
"\\oplus" to "⊕",
"\\otimes" to "⊗",
"\\odot" to "⊙",
"\\setminus" to "∖",
"\\int!!!int!!!int" to "∭",
"\\int!!!int" to "∬",
"\\int" to "∫",
"\\cdot" to "·",
"\\to" to "→",
"\\infty" to "∞",
"\\Rightarrow" to "⇒",
"\\Leftrightarrow" to "⇔",
"\\forall" to "∀",
"\\partial" to "∂",
"\\exists" to "∃",
"\\emptyset" to "∅",
"\\nabla" to "∇",
"\\in" to "∈",
"\\not\\in" to "∉",
"\\notin" to "∉",
"\\prod" to "∏",
"\\sum" to "∑",
"\\surd" to "√",
"\\wedge" to "∧",
"\\land" to "∧",
"\\vee" to "∨",
"\\lor" to "∨",
"\\lnot" to "!",
"\\cap" to "∩",
"\\cup" to "∪",
"\\int" to "∫",
"\\approx" to "≈",
"\\neq" to "≠",
"\\equiv" to "≡",
"\\leq" to "≤",
"\\geq" to "≥",
"\\subseteq" to "⊆",
"\\subsetneq" to "⊊",
"\\supseteq" to "⊇",
"\\supsetneq" to "⊋",
"\\subset" to "⊂",
"\\supset" to "⊃",
"^\\circ" to "°",
"\\times" to "×",
"\\lfloor" to "⌊",
"\\rfloor" to "⌋",
"\\lceil" to "⌈",
"\\rceil" to "⌉",
"\\nexists" to "∅",
"\\Delta" to "Δ",
"\\sphericalangle" to "∢",
"\\measuredangle" to "∡",
"\\angle" to "∠",
"\\cong" to "≅",
"\\widehat" to "◡",
"\\parallel" to "∥",
"\\perp" to "⊥",
"\\triangle" to "△",
"\\sim" to "∼",
"\\overline" to "",
"\\overrightarrow" to "",
"\\aleph_0" to "ℵ",
"\\alpha" to "α",
"\\kappa" to "κ",
"\\psi" to "ψ",
"\\digamma" to "z",
"\\Delta" to "∆",
"\\Theta" to "Θ",
"\\beta" to "β",
"\\lambda" to "λ",
"\\rho" to "ρ",
"\\varepsilon" to "ε",
"\\Gamma" to "Γ",
"\\Upsilon" to "Υ",
"\\chi" to "χ",
"\\mu" to "µ",
"\\sigma" to "σ",
"\\varkappa" to "κ",
"\\Lambda" to "Λ",
"\\Xi" to "Ξ",
"\\delta" to "δ",
"\\nu" to "ν",
"\\tau" to "τ",
"\\varphi" to "φ",
"\\Omega" to "Ω",
"\\epsilon" to "ε",
"\\theta" to "θ",
"\\varpi" to "π",
"\\Phi" to "Φ",
"\\aleph" to "ℵ",
"\\eta" to "η",
"\\omega" to "ω",
"\\upsilon" to "υ",
"\\varrho" to "ρ",
"\\Pi" to "Π",
"\\gamma" to "γ",
"\\phi" to "φ",
"\\xi" to "ξ",
"\\varsigma" to "ς",
"\\Psi" to "Ψ",
"\\iota" to "ι",
"\\pi" to "π",
"\\zeta" to "ζ",
"\\vartheta" to "ϑ",
"\\Sigma" to "Σ"
)
} |
Hi, |
Thanks ! |
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Is it possible to parse math expressions in markdown, like
\(a \times b\)
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