StringEvaluation
Library "StringEvaluation"
Methods to handle evaluation of strings.
is_comma(char) Check if char is a comma ".".
Parameters:
is_op(char) Check if char is a operator.
Parameters:
number(char) convert a single char string into valid number.
Parameters:
operator(op, left, right) operation between left and right values.
Parameters:
operator_precedence(op) level of precedence of operator.
Parameters:
cleanup(_str) Evaluate a string to clean up and retrieve only used chars
Parameters:
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:.. '' --> ''
Parameters:
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().
| @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
| @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.
is_op(char) Check if char is a operator.
Parameters:
- char: string, 1 character string.
number(char) convert a single char string into valid number.
Parameters:
- char: string, 1 character string.
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.
cleanup(_str) Evaluate a string to clean up and retrieve only used chars
Parameters:
- _str: string, arithmetic operations in a string.
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:.. '' --> ''
Parameters:
- tokens: string array, array with arithmetic notation.
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().
| @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
| @param arguments float array, arguments.
| @returns float, solution.
Versionshinweise:
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.
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.
Versionshinweise:
v3 minor modification to see if it fixes a bug..
Versionshinweise:
v4 small test to see if i capture the source of a bug..