PINE LIBRARY
StringEvaluation
Telah dikemas kini
Library "StringEvaluation"
Methods to handle evaluation of strings.
is_comma(char) Check if char is a comma ".".
Parameters:
Returns: bool.
is_op(char) Check if char is a operator.
Parameters:
Returns: bool.
number(char) convert a single char string into valid number.
Parameters:
Returns: float.
operator(op, left, right) operation between left and right values.
Parameters:
operator_precedence(op) level of precedence of operator.
Parameters:
Returns: int.
cleanup(_str) Evaluate a string to clean up and retrieve only used chars
Parameters:
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:
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.
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.
Nota Keluaran
v2Update: 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.
Nota Keluaran
v3 minor modification to see if it fixes a bug..Nota Keluaran
v4 small test to see if i capture the source of a bug..Perpustakaan Pine
Dalam semangat sebenar TradingView, penulis telah menerbitkan kod Pine ini sebagai satu perpustakaan sumber terbuka supaya pengaturcara Pine lain dari komuniti kami boleh menggunakannya semula. Sorakan kepada penulis! Anda boleh menggunakan perpustakaan ini secara peribadi atau dalam penerbitan sumber terbuka lain, tetapi penggunaan semula kod dalam penerbitan ini adalah dikawal oleh Peraturan dalaman.
Penafian
Maklumat dan penerbitan adalah tidak dimaksudkan untuk menjadi, dan tidak membentuk, nasihat untuk kewangan, pelaburan, perdagangan dan jenis-jenis lain atau cadangan yang dibekalkan atau disahkan oleh TradingView. Baca dengan lebih lanjut di Terma Penggunaan.