StringEvaluation

Library "StringEvaluation"
Methods to handle evaluation of strings.

is_comma(char) Check if char is a comma ".".
Parameters:

char: string, 1 character string.

Returns: bool.

is_op(char) Check if char is a operator.
Parameters:

char: string, 1 character string.

Returns: bool.

number(char) convert a single char string into valid number.
Parameters:

char: string, 1 character string.

Returns: float.

operator(op, left, right) operation between left and right values.
Parameters:

op: string, operator string character.
left: float, left value of operation.
right: float, right value of operation.

operator_precedence(op) level of precedence of operator.
Parameters:

op: string, operator 1 char string.

Returns: int.

cleanup(_str) Evaluate a string to clean up and retrieve only used chars
Parameters:

_str: string, arithmetic operations in a string.

Returns: string array, evaluated array.

generate_rpn(tokens) uses Shunting-Yard algorithm to generate a RPN (Reverse Polish notation)
array of strings from a array of strings containing arithmetic notation.
ex:.. '[3 + 4 * 2 / ( 1 - 5 ) ^ 2 ^ 3]' --> '[3 4 2 * 1 5 - 2 3 ^ ^ / +]'
Parameters:

tokens: string array, array with arithmetic notation.

Returns:

parse_rpn() evaluate a RPN (Reverse Polish notation) array of strings.
ex:.. 3 4 2 * 1 5 - 2 3 ^ ^ / +
| param tokens string array, RPN ordered tokens, ex(['3', '4', '2', '1', '5', '2', '3', '*', '-', '^', '^', '/', '+']).
| Returns float, solution.

eval() evaluate a string with references to a array of arguments.
| param tokens string, arithmetic operations with references to indices in arguments, ex:"0+1*0+2*2+3" arguments[1, 2, 3]
| param arguments float array, arguments.
| Returns float, solution.

Notas de prensa

v2
Update: supports boolean operators and float numbers now
Added:
is_op_component(char) Check if char is a operator component.
Parameters:
char: string, 1 character string.
Returns: bool.

is_boolean_op(char) Check if char is a boolean operator.
Parameters:
char: string, 1 character string.
Returns: bool.

is_alpha(char) Check if char is alphabet.
Parameters:
char: string, 1 character string.
Returns: bool.

boolean_operator(op, left, right) boolean operation between left and right values.
Parameters:
op: string, operator string character.
left: float, left value of operation.
right: float, right value of operation.

boolean_operator_precedence(op) level of precedence of operator.
Parameters:
op: string, operator 1 char string.
Returns: int.

aggregate_words(tokens) Aggregates words, numbers and operators into one.
Parameters:
tokens: string array, array with split string into character tokens.
Returns: string array.

Notas de prensa

v3 minor modification to see if it fixes a bug..

Notas de prensa

v4 small test to see if i capture the source of a bug..

Biblioteca Pine

Fiel al espíritu de TradingView, el autor ha publicado este código de Pine como biblioteca de código abierto, para que otros programadores de nuestra comunidad puedan reutilizarlo. ¡Enhorabuena al autor! Puede usar esta biblioteca de forma privada o en otras publicaciones de código abierto, pero su reutilización en publicaciones está sujeta a nuestras Normas internas.

RicardoSantos

Exención de responsabilidad

La información y las publicaciones no constituyen, ni deben considerarse como, asesoramiento o recomendaciones financieras, de inversión, de trading u otro tipo, proporcionadas o respaldadas por TradingView. Obtenga más información en Condiciones de uso.

Biblioteca Pine

RicardoSantos