mirror of
https://github.com/kovidgoyal/calibre.git
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193 lines
6.7 KiB
Plaintext
193 lines
6.7 KiB
Plaintext
###########################################################
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# RapydScript Standard Library
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# Author: Alexander Tsepkov
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# Copyright 2013 Pyjeon Software LLC
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# License: Apache License 2.0
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# This library is covered under Apache license, so that
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# you can distribute it with your RapydScript applications.
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###########################################################
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# basic implementation of Python's 'math' library
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# NOTE: this is only meant to aid those porting lots of Python code into RapydScript,
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# if you're writing a new RapydScript application, in most cases you probably want to
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# use JavaScript's Math module directly instead
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pi = Math.PI
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e = Math.E
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########################################
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# Number-theoretic and representation functions
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########################################
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def ceil(x):
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return Math.ceil(x)
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def copysign(x, y):
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x = Math.abs(x)
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if y < 0:
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return -x
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else:
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return x
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def fabs(x):
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return Math.abs(x)
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def factorial(x):
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if Math.abs(int(x)) is not x:
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raise ValueError("factorial() only accepts integral values")
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factorial.cache = []
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r = def(n):
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if n is 0 or n is 1:
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return 1
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if not factorial.cache[n]:
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factorial.cache[n] = r(n-1) * n
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return factorial.cache[n]
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return r(x)
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def floor(x):
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return Math.floor(x)
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def fmod(x, y):
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# javascript's % operator isn't consistent with C fmod implementation, this function is
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while y <= x:
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x -= y
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return x
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def fsum(iterable):
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# like Python's fsum, this method is much more resilient to rounding errors than regular sum
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partials = [] # sorted, non-overlapping partial sums
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for x in iterable:
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i = 0
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for y in partials:
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if Math.abs(x) < Math.abs(y):
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x, y = y, x
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hi = x + y
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lo = y - (hi - x)
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if lo:
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partials[i] = lo
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i += 1
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x = hi
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#partials[i:] = [x]
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partials.splice(i, partials.length-i, x)
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return sum(partials)
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def isinf(x):
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return not isFinite(x)
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def isnan(x):
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return isNaN(x)
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def modf(x):
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m = fmod(x, 1)
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return m, x-m
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def trunc(x):
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return x | 0
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########################################
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# Power and logarithmic functions
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########################################
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def exp(x):
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return Math.exp(x)
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def expm1(x):
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# NOTE: Math.expm1() is currently only implemented in Firefox, this provides alternative implementation
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# https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/expm1
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#return Math.expm1(x)
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if Math.abs(x) < 1e-5:
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return x + 0.5*x*x
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else:
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return Math.exp(x) - 1
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def log(x, base=e):
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return Math.log(x)/Math.log(base)
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def log1p(x):
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# NOTE: Math.log1p() is currently only implemented in Firefox, this provides alternative implementation
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# https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/log1p
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# this version has been taken from http://phpjs.org/functions/log1p/
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# admittedly it's not as accurate as MDN version, as you can see from math.log1p(1) result
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ret = 0
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n = 50
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if x <= -1:
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return Number.NEGATIVE_INFINITY
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if x < 0 or x > 1:
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return Math.log(1 + x)
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for i in range(1, n):
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if i % 2 is 0:
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ret -= Math.pow(x, i) / i
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else:
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ret += Math.pow(x, i) / i
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return ret
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def log10(x):
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# NOTE: Math.log10() is currently only implemented in Firefox, this provides alternative implementation
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# https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/log10
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# I didn't find a more accurate algorithm so I'm using the basic implementation
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return Math.log(x)/Math.LN10
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def pow(x, y):
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if x < 0 and int(y) is not y:
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raise ValueError('math domain error')
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if isnan(y) and x is 1:
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return 1
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return Math.pow(x, y)
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def sqrt(x):
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return Math.sqrt(x)
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########################################
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# Trigonometric functions
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########################################
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def acos(x): return Math.acos(x)
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def asin(x): return Math.asin(x)
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def atan(x): return Math.atan(x)
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def atan2(y, x): return Math.atan2(y, x)
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def cos(x): return Math.cos(x)
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def sin(x): return Math.sin(x)
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def hypot(x, y): return Math.sqrt(x*x + y*y)
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def tan(x): return Math.tan(x)
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########################################
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# Angular conversion
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########################################
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def degrees(x): return x*180/pi
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def radians(x): return x*pi/180
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########################################
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# Hyperbolic functions
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########################################
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def acosh(x):
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# NOTE: will be replaced with official, when it becomes mainstream
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# https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/acosh
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return Math.log(x + Math.sqrt(x*x - 1))
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def asinh(x):
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# NOTE: will be replaced with official, when it becomes mainstream
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# https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/asinh
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return Math.log(x + Math.sqrt(x*x + 1))
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def atanh(x):
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# NOTE: will be replaced with official, when it becomes mainstream
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# https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/atanh
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return 0.5 * Math.log((1 + x) / (1 - x))
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def cosh(x):
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# NOTE: will be replaced with official, when it becomes mainstream
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# https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/cosh
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return (Math.exp(x) + Math.exp(-x)) / 2
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def sinh(x):
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# NOTE: will be replaced with official, when it becomes mainstream
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# https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/sinh
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return (Math.exp(x) - Math.exp(-x)) / 2
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def tanh(x):
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# NOTE: will be replaced with official, when it becomes mainstream
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# https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/tanh
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return (Math.exp(x) - Math.exp(-x)) / (Math.exp(x) + Math.exp(-x))
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#import stdlib
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#print(math.ceil(4.2))
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#print(math.floor(4.2))
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#print(math.fabs(-6))
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#print(math.copysign(-5, 7))
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#print(math.factorial(4))
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#print(math.fmod(-1e100, 1e100))
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#
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#d = [0.9999999, 1, 2, 3]
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#print(sum(d), math.fsum(d))
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#print(math.isinf(5), math.isinf(Infinity))
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#print(math.modf(5.5))
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#print(math.trunc(2.6), math.trunc(-2.6))
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#print(math.exp(1e-5), math.expm1(1e-5))
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#print(math.log(10), math.log(10, 1000))
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#print(math.log1p(1e-15), math.log1p(1))
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#print(math.log10(1000), math.log(1000, 10))
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#print(math.pow(1, 0), math.pow(1, NaN), math.pow(0, 0), math.pow(NaN, 0), math.pow(4,3), math.pow(100, -2))
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#print(math.hypot(3,4))
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#print(math.acosh(2), math.asinh(1), math.atanh(0.5), math.cosh(1), math.cosh(-1), math.sinh(1), math.tanh(1))
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