parsec

Description:

parsec

parsec #
The multi-platform parsec plugin for Flutter to calculate math equations using C++ library.
Platform Support #



Android
iOS
Windows
Linux
MacOS
Web




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Usage #
To use this plugin, add parsec as a dependency in your pubspec.yaml file.
Example #
import 'package:parsec/parsec.dart';

void main() {
final Parsec parsec = Parsec();
dynamic result;

try {
result = await parsec.eval('5*5 + 5!');
} catch (e) {
result = e.toString();
}
}
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Here are examples of equations which are accepted by the parsec #
final Parsec parsec = Parsec();

# Simple Math equations
parsec.eval('(5 + 1) + (6 - 2)') # result => 10
parsec.eval('4 + 4 * 3') # result => 16
parsec.eval('10.5 / 5.25') # result => 2
parsec.eval('abs(-5)') # result => 5
parsec.eval('sqrt(16) + cbrt(8)') # result => 6
parsec.eval('log10(10)') # result => 1
parsec.eval('round(4.4)') # result => 4
parsec.eval('(3^3)^2') # result => 729
parsec.eval('3^(3^(2))') # result => 19683
parsec.eval('10!') # result => 3628800
parsec.eval('string(10)') # result => "10"

# Complex Math equations
parsec.eval('log10(10) + ln(e) + log(10)') # result => 4.30259
parsec.eval('sin(1) + cos(0) + tan(0.15722)') # result => 2.0
parsec.eval('max(1, 2) + min(3, 4) + sum(5, 6)') # result => 16
parsec.eval('avg(9, 9.8, 10)') # result => 9.6
parsec.eval('pow(2, 3)') # result => 8
parsec.eval('round_decimal(4.559, 2)') # result => 4.56

# IF THEN ELSE equations
parsec.eval('4 > 2 ? "bigger" : "smaller"') # result => "bigger"
parsec.eval('2 == 2 ? true : false') # result => true
parsec.eval('2 != 2 ? true : false') # result => false
parsec.eval('"this" == "this" ? "yes" : "no"') # result => "yes"
parsec.eval('"this" != "that" ? "yes" : "no"') # result => "yes"

# Logic equations
parsec.eval('true and false') # result => false
parsec.eval('true or false') # result => true
parsec.eval('(3==3) and (3!=3)') # result => false
parsec.eval('exp(1) == e') # result => true

# String equations
parsec.eval('length("test string")') # result => 11
parsec.eval('toupper("test string")') # result => "TEST STRING"
parsec.eval('tolower("TEST STRING")') # result => "test string"
parsec.eval('concat("Hello ", "World")') # result => "Hello World"
parsec.eval('link("Title", "http://foo.bar")') # result => "<a href="http://foo.bar">Title</a>"
parsec.eval('str2number("5")') # result => 5
parsec.eval('left("Hello World", 5)') # result => "Hello"
parsec.eval('right("Hello World", 5)') # result => "World"
parsec.eval('number("5")') # result => 5

# Date equations (return the difference in days)
parsec.eval("current_date()")) # result => "2018-10-03"
parsec.eval('daysdiff(current_date(), "2018-10-04")') # result => 1
parsec.eval('daysdiff("2018-01-01", "2018-12-31")') # result => 364

# DateTime equations (return the difference in hours)
parsec.eval('hoursdiff("2018-01-01", "2018-01-02")') # result => 24
parsec.eval('hoursdiff("2019-02-01T08:00", "2019-02-01T12:00")') # result => 4
parsec.eval('hoursdiff("2019-02-01T08:20", "2019-02-01T12:00")') # result => 3.67
parsec.eval('hoursdiff("2018-01-01", "2018-01-01")') # result => 0
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The following functions can be used #

Math trigonometric functions: sin, cos, tan, sinh, cosh, tanh, asin, acos, atan, asinh, acosh, atanh
Math logarithm functions: ln, log, log10
Math standard functions: abs, sqrt, cbrt, pow, exp, round, round_decimal
Number functions: string
Math constants: e, pi
Unlimited number of arguments: min, max, sum, avg
String functions: concat, length, toupper, tolower, left, right, str2number, number, link
Complex functions: real, imag, conj, arg, norm
Array functions: sizeof, eye, ones, zeros
Date functions: current_date, daysdiff, hoursdiff
Extra functions: default_value