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Without one, the generated expression may not evaluate to anything under some condition.rz if (%s) {rz else {z else if (%s) {rrn  ) rr ValueError enumeraterrr _settingsjoin)rSrrreccode0rrr_print_Piecewises     z RustCodePrinter._print_PiecewisecCs ddlm}||j|ddS)Nr) PiecewiseF)deep)sympy.functionsrrr)rSrrrrr _print_ITEs zRustCodePrinter._print_ITEcs2|jdkr&ddfdd|DStddS)Nrz[%s]rc3s|]}|VqdSr )r)rarrrrrz4RustCodePrinter._print_MatrixBase..zLFull Matrix Support in Rust need Crates (https://crates.io/keywords/matrix).)rrr)rSArrr_print_MatrixBases z!RustCodePrinter._print_MatrixBasecCs ||Sr )r)rSrrrr_print_SparseRepMatrixsz&RustCodePrinter._print_SparseRepMatrixcCs"d|j|j|j|jjdfS)Nrr)parentrrrrrrr_print_MatrixElementsz$RustCodePrinter._print_MatrixElementcs&t|}||jvrd|S|SdS)Nz(*%s))rW _print_Symbolru)rSrrrrrrs  zRustCodePrinter._print_SymbolcCslddlm}|j}|j}|jdrB||s6||rB|||S||}||}|d||fSdS)Nr) IndexedBaserjz%s = %s) sympy.tensor.indexedrrrrhas_doprint_loopsrr})rSrrrrrrrrr_print_Assignments    z!RustCodePrinter._print_Assignmentc st|tr$||d}d|Sd}dddd|D}fdd|D}fd d|D}g}d }t|D]J\}} | d vr|| qr|||8}|d ||| f|||7}qr|S) z0Accepts a string of code or a list of code linesTrz ){rz{ z( )rrcSsg|]}|dqS)z )lstriprlinerrr rz/RustCodePrinter.indent_code..cs g|]}ttt|jqSr)ranymapendswithr) inc_tokenrrrrcs g|]}ttt|jqSr)rrr  startswithr) dec_tokenrrrsr)rrz%s%s)rrr splitlinesrrr) rScode code_linestabincreasedecreaseprettylevelnrr)r r rrs*     zRustCodePrinter.indent_code)F)F)F)F)F)F)F)F)F)F)+r __module__ __qualname____doc__ printmethodlanguagert_default_settingsror{r}rrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr __classcell__rrrrr`s`   8          r`NcKst|||S)aConverts an expr to a string of Rust code Parameters ========== expr : Expr A SymPy expression to be converted. assign_to : optional When given, the argument is used as the name of the variable to which the expression is assigned. Can be a string, ``Symbol``, ``MatrixSymbol``, or ``Indexed`` type. This is helpful in case of line-wrapping, or for expressions that generate multi-line statements. precision : integer, optional The precision for numbers such as pi [default=15]. user_functions : dict, optional A dictionary where the keys are string representations of either ``FunctionClass`` or ``UndefinedFunction`` instances and the values are their desired C string representations. Alternatively, the dictionary value can be a list of tuples i.e. [(argument_test, cfunction_string)]. See below for examples. dereference : iterable, optional An iterable of symbols that should be dereferenced in the printed code expression. These would be values passed by address to the function. For example, if ``dereference=[a]``, the resulting code would print ``(*a)`` instead of ``a``. human : bool, optional If True, the result is a single string that may contain some constant declarations for the number symbols. If False, the same information is returned in a tuple of (symbols_to_declare, not_supported_functions, code_text). [default=True]. contract: bool, optional If True, ``Indexed`` instances are assumed to obey tensor contraction rules and the corresponding nested loops over indices are generated. Setting contract=False will not generate loops, instead the user is responsible to provide values for the indices in the code. [default=True]. Examples ======== >>> from sympy import rust_code, symbols, Rational, sin, ceiling, Abs, Function >>> x, tau = symbols("x, tau") >>> rust_code((2*tau)**Rational(7, 2)) '8*1.4142135623731*tau.powf(7_f64/2.0)' >>> rust_code(sin(x), assign_to="s") 's = x.sin();' Simple custom printing can be defined for certain types by passing a dictionary of {"type" : "function"} to the ``user_functions`` kwarg. Alternatively, the dictionary value can be a list of tuples i.e. [(argument_test, cfunction_string)]. >>> custom_functions = { ... "ceiling": "CEIL", ... "Abs": [(lambda x: not x.is_integer, "fabs", 4), ... (lambda x: x.is_integer, "ABS", 4)], ... "func": "f" ... } >>> func = Function('func') >>> rust_code(func(Abs(x) + ceiling(x)), user_functions=custom_functions) '(fabs(x) + x.CEIL()).f()' ``Piecewise`` expressions are converted into conditionals. If an ``assign_to`` variable is provided an if statement is created, otherwise the ternary operator is used. Note that if the ``Piecewise`` lacks a default term, represented by ``(expr, True)`` then an error will be thrown. This is to prevent generating an expression that may not evaluate to anything. >>> from sympy import Piecewise >>> expr = Piecewise((x + 1, x > 0), (x, True)) >>> print(rust_code(expr, tau)) tau = if (x > 0) { x + 1 } else { x }; Support for loops is provided through ``Indexed`` types. With ``contract=True`` these expressions will be turned into loops, whereas ``contract=False`` will just print the assignment expression that should be looped over: >>> from sympy import Eq, IndexedBase, Idx >>> len_y = 5 >>> y = IndexedBase('y', shape=(len_y,)) >>> t = IndexedBase('t', shape=(len_y,)) >>> Dy = IndexedBase('Dy', shape=(len_y-1,)) >>> i = Idx('i', len_y-1) >>> e=Eq(Dy[i], (y[i+1]-y[i])/(t[i+1]-t[i])) >>> rust_code(e.rhs, assign_to=e.lhs, contract=False) 'Dy[i] = (y[i + 1] - y[i])/(t[i + 1] - t[i]);' Matrices are also supported, but a ``MatrixSymbol`` of the same dimensions must be provided to ``assign_to``. Note that any expression that can be generated normally can also exist inside a Matrix: >>> from sympy import Matrix, MatrixSymbol >>> mat = Matrix([x**2, Piecewise((x + 1, x > 0), (x, True)), sin(x)]) >>> A = MatrixSymbol('A', 3, 1) >>> print(rust_code(mat, A)) A = [x.powi(2), if (x > 0) { x + 1 } else { x }, x.sin()]; )r`doprint)r assign_torwrrr rust_codesmr cKstt|fi|dS)z3Prints Rust representation of the given expression.N)printr )rrwrrrprint_rust_codemsr")N)rtypingrrtDict sympy.corerrrrZsympy.printing.codeprinterrrqrvr`r r"rrrrsP!        l6& p