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proxy.golang.org : github.com/fbac/calc-o-matic
### Known issues: - A regexp in the parser should check for invalid expressions where two incompatible operators are following each other, such as Calculate("1 + * 4") If that's the case, the parser only applies the first operation found. - MathFunctions only handle integers - Substraction does not support substracting negative ints, e.g "1 - (-1)" should be 2 - Pow does not support negative powers such as 1^-3, because of only using ints ### Technical debt: - Extending pkg/grammar: TokenType type should include more types: whitespace, EOL, EOF, more operations for extended capabilities Token type should have initial and ending position in expression to better handle parsing the expression, doing it with indexes instead of strings/runes. That would get rid of the problems of parsing whitespaces, multidigit numbers, etc - Extending pkg/parser: - Extending pkg/stack: - About project tree: ### Other design ideas (from best to worst IMHO) - Using ANTLR (https://www.antlr.org/). Probably the best idea, since it can create a powerful grammar with precedence, lexer and parsers. Also, I've always wanted to have the opportunity to learn more about it. Definitely going to do it asap. - Using a composite pattern: https://golangbyexample.com/composite-design-pattern-golang/ or a finite automata design. - Golang using external eval libraries already implemented, such as https://github.com/Knetic/govaluate. Probably the safest and best time saver approach. - python or other languages with built-in eval(). Not a big fan, due to being a really insecure method.
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purl: pkg:golang/github.com/fbac/calc-o-matic
Keywords: algorithm-challenges, algorithms, calculator, calculator-app, go, golang, shunting-yard-algorithm
License: GPL-3.0
Latest release: over 1 year ago
First release: over 1 year ago
Namespace: github.com/fbac
Stars: 0 on GitHub
Forks: 0 on GitHub
See more repository details: repos.ecosyste.ms
Last synced: 6 days ago