bergamot-elm/src/Bergamot/Latex.elm

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module Bergamot.Latex exposing (..)
import Bergamot.Syntax exposing (..)
import Bergamot.Rules exposing (..)
termToLatex : (a -> String) -> Term a -> String
termToLatex f t =
case t of
Call "type" [t1, t2] -> termToLatex f t1 ++ " : " ++ termToLatex f t2
Call "intlit" [t1] -> termToLatex f t1
Call "tpair" [t1, t2] -> termToLatex f t1 ++ "\\times" ++ termToLatex f t2
Call "plus" [t1, t2] -> termToLatex f t1 ++ " + " ++ termToLatex f t2
Call "pair" [t1, t2] -> "(" ++ termToLatex f t1 ++ ", " ++ termToLatex f t2 ++ ")"
Call s [] -> "\\text{" ++ s ++ "}"
Call s ts -> "\\text{" ++ s ++ "}(" ++ String.join "," (List.map (termToLatex f) ts) ++ ")"
Var x -> f x
IntLit i -> String.fromInt i
StringLit s -> "\"" ++ s ++ "\""
metavariableToLatex : Metavariable -> String
metavariableToLatex (MkMetavariable s) =
let
noQuestion = String.dropLeft 1 s
in
if String.startsWith "tau" noQuestion then "\\" ++ noQuestion else noQuestion
ruleToLatex : Rule -> String
ruleToLatex r = "\\cfrac{" ++ String.join "\\quad " (List.map (termToLatex metavariableToLatex) r.premises) ++ "}{" ++ termToLatex metavariableToLatex r.conclusion ++ "}\\ \\texttt{" ++ r.name ++ "}"
unificationVarToLatex : UnificationVar -> String
unificationVarToLatex (MkUnificationVar s) = s
proofTreeToLatex : ProofTree -> String
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proofTreeToLatex (MkProofTree node) = "\\cfrac{" ++ String.join "\\quad \\quad " (List.map proofTreeToLatex node.premises) ++ "}{" ++ termToLatex unificationVarToLatex node.conclusion ++ "}\\ \\texttt{" ++ node.name ++ "}"