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xpy.py

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+# xpy
+# https://github.com/Decimation/Nspire-Library
+# Author: Read Stanton
+# based off of eval_expr by Adrien "Adriweb" Bertrand
+# https://github.com/TI-Planet/eval_expr
+
+# Useful for eval
+from math import sqrt, pi, e
+from ti_system import * 
+
+# Internal helper functions....
+def _try_parse_num(s):
+  try:
+    f = float(s)
+    return int(f) if int(f) == f else f
+  except ValueError:
+    return s
+
+def _try_eval(thing):
+  try:
+    return eval("("+str(thing)+")")
+  except:
+    return thing
+
+def _cleanstr(res):
+  res = res[1:-1]  # to remove the quotes
+  res = res.replace("*\uf02f", "j")  # complex i
+  res = res.replace("\uf02f", "j")  # complex i
+  res = res.replace("\u221a", "sqrt")
+  res = res.replace("\u03c0", "pi")
+  res = res.replace("\uf03f", "e")
+  res = _try_parse_num(res)  # auto type...
+  return res
+
+# Public functions
+def eval_expr(expr, trypyeval=False):
+  TMP = "tmppy_"
+  os_write(TMP, 'strsub(string('+str(expr)+'),"/","$%$")')  # eval and store
+  res = os_read(TMP)  # retrieve stored value
+  res = res.replace("$%$", "/")  # magic replacement
+  res = _cleanstr(res)
+  if trypyeval == True:
+    res = _try_eval(res)
+  return res
+
+def call_func(funcname, *pyargs):
+  fargs = ','.join(map(str, pyargs))
+  expr = funcname + '(' + fargs + ')'
+  res = eval_expr(expr)
+  return res if res != expr else None
+
+def eval_expr2(name):
+  return _cleanstr(readST("string("+name+")"))
+
+#def eval_expr2(name):
+#  return _cleanstr(call_func('string',name))
+
+def os_read(name):
+  res = readST(name)
+  return res
+
+def os_write(name, val):
+  writeST(name, val)
+
+# Aliases for compat with other stuff
+caseval = eval_expr
+eval_native = eval_expr