mirror of https://github.com/nocturn9x/nimkalc.git
Fixed various bugs and added a few functions
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README.md
34
README.md
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@ -8,19 +8,43 @@ find any bugs or issues, please report them so we can fix them and make a proper
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Features:
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- Support for mathematical constants (`pi`, `tau` and `e` right now)
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- Supported functions:
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- Support for the following mathematical constants:
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- `pi`
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- `tau` (pi * 2)
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- `e` (Euler's number)
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- `inf` (Infinity)
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- `nan` (Not a number)
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- Support for the following of nim's [math library](https://nim-lang.org/docs/math.html#log10%2Cfloat32) functions:
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- `binom`
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- `sin`
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- `cos`
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- `tan`
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- `sinh`
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- `tanh`
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- `cosh`
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- `arccos`
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- `arcsin`
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- `arctan`
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- `arcsinh`
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- `arccosh`
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- `arctanh`
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- `hypot`
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- `sqrt`
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- `root` (for generic roots, takes the base and the argument)
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- `log` (logarithm in base `e`)
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- `logN` (logarithm in a given base, second argument)
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- `cbrt`
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- `log10`
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- `log2`
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- `ln`
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- `log`
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- Parentheses can be used to enforce different precedence levels
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- Easy API for tokenization, parsing and evaluation of AST nodes
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__Note__: Some procedures were not implemented because for any of the following reasons:
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- They return booleans or other custom types that we don't support, like `classify`
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- They weren't useful enough or their functionality was already implemented in other ways (such as `pow` which we use as the `^` operator)
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- They just haven't made their way into the library yet, be patient!
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## Current limitations
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- No equation-solving (coming soon)
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@ -1,6 +1,6 @@
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# Package
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version = "0.2.3"
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version = "0.2.4"
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author = "Mattia Giambirtone"
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description = "An advanced parsing library for mathematical expressions and equations"
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license = "Apache 2.0"
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@ -95,7 +95,7 @@ template ensureNonZero(node: AstNode) =
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if node.value == 0.0:
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case node.kind:
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of NodeKind.Float, NodeKind.Integer:
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raise newException(MathError, &"{($node.kind).toLowerAscii()} can't be zero")
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raise newException(MathError, "value can't be zero")
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else:
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raise newException(CatchableError, &"invalid node kind '{node.kind}' for ensureNonZero")
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@ -151,12 +151,53 @@ proc visit_literal(self: NodeVisitor, node: AstNode): AstNode =
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proc visit_call(self: NodeVisitor, node: AstNode): AstNode =
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## Visits function call expressions
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if node.function.name == "sin":
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case node.function.name:
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of "sin":
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callFunction(sin, self.eval(node.arguments[0]).value)
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if node.function.name == "cos":
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of "cos":
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callFunction(cos, self.eval(node.arguments[0]).value)
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if node.function.name == "tan":
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of "tan":
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callFunction(tan, self.eval(node.arguments[0]).value)
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of "sqrt":
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callFunction(sqrt, self.eval(node.arguments[0]).value)
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of "log":
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let arg = self.eval(node.arguments[0])
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ensureNonZero(arg)
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callFunction(log, self.eval(node.arguments[0]).value, self.eval(node.arguments[1]).value)
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of "ln":
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let arg = self.eval(node.arguments[0])
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ensureNonZero(arg)
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callFunction(ln, self.eval(node.arguments[0]).value)
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of "log2":
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let arg = self.eval(node.arguments[0])
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ensureNonZero(arg)
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callFunction(log2, self.eval(node.arguments[0]).value)
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of "log10":
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let arg = self.eval(node.arguments[0])
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ensureNonZero(arg)
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callFunction(log10, self.eval(node.arguments[0]).value)
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of "cbrt":
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callFunction(cbrt, self.eval(node.arguments[0]).value)
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of "tanh":
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callFunction(sinh, self.eval(node.arguments[0]).value)
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of "sinh":
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callFunction(tanh, self.eval(node.arguments[0]).value)
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of "cosh":
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callFunction(cosh, self.eval(node.arguments[0]).value)
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of "arcsin":
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callFunction(arcsin, self.eval(node.arguments[0]).value)
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of "arccos":
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callFunction(arccos, self.eval(node.arguments[0]).value)
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of "arctan":
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callFunction(arctan, self.eval(node.arguments[0]).value)
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of "arctanh":
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callFunction(arctanh, self.eval(node.arguments[0]).value)
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of "arcsinh":
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callFunction(arcsinh, self.eval(node.arguments[0]).value)
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of "arccosh":
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callFunction(arccosh, self.eval(node.arguments[0]).value)
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of "hypot":
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callFunction(hypot, self.eval(node.arguments[0]).value, self.eval(node.arguments[1]).value)
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proc visit_grouping(self: NodeVisitor, node: AstNode): AstNode =
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@ -35,10 +35,16 @@ const tokens = to_table({
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const constants = to_table({
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"pi": Token(kind: TokenType.Float, lexeme: "3.141592653589793"),
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"e": Token(kind: TokenType.Float, lexeme: "2.718281828459045"),
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"tau": Token(kind: TokenType.Float, lexeme: "6.283185307179586")
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"tau": Token(kind: TokenType.Float, lexeme: "6.283185307179586"),
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"inf": Token(kind: TokenType.Float, lexeme: "inf"),
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"nan": Token(kind: TokenType.Float, lexeme: "nan")
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})
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# Since also math functions are hardcoded, we can use an array
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const functions = ["sin", "cos", "tan"]
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const functions = ["sin", "cos", "tan", "cosh",
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"tanh", "sinh", "arccos", "arcsin",
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"arctan", "log", "log10", "ln", "log2",
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"hypot", "sqrt", "cbrt", "arctanh", "arcsinh",
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"arccosh"]
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type
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@ -32,7 +32,12 @@ type
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current: int
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const arities = to_table({"sin": 1, "cos": 1, "tan": 1})
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const arities = to_table({"sin": 1, "cos": 1, "tan": 1, "cosh": 1,
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"tanh": 1, "sinh": 1, "arccos": 1, "arcsin": 1,
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"arctan": 1, "log": 2, "log10": 1, "ln": 1, "log2": 1,
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"hypot": 2, "sqrt": 1, "cbrt": 2, "arctanh": 1, "arcsinh": 1,
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"arccosh": 1
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})
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proc initParser*(): Parser =
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@ -150,16 +155,16 @@ proc call(self: Parser): AstNode =
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## Parses function calls such as sin(2)
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var expression = self.primary()
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if self.match(TokenType.LeftParen):
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if expression.kind != NodeKind.Ident:
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self.error(&"object of type '{expression.kind}' is not callable")
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var arguments: seq[AstNode] = @[]
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if not self.check(TokenType.RightParen):
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arguments.add(self.binary())
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while self.match(TokenType.Comma):
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arguments.add(self.binary())
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result = AstNode(kind: NodeKind.Call, arguments: arguments, function: expression)
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if expression.kind != NodeKind.Ident:
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self.error(&"can't call object of type {expression.kind}")
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if len(arguments) != arities[expression.name]:
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self.error(&"Wrong number of arguments for '{expression.name}': expected {arities[expression.name]}, got {len(arguments)}")
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self.error(&"wrong number of arguments for '{expression.name}': expected {arities[expression.name]}, got {len(arguments)}")
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self.expect(TokenType.RightParen, "unclosed function call")
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else:
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result = expression
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