Code review: a "tokenizer" library based on regular expressions

gonzalo.chumillas · February 19, 2019, 9:38am

Hello to Everybody,

That was my first library written in GO. It was a “tokenizer” library based on regular expressions:

And this is a proof of concept. The following code evaluates a mathematical expressions:

gomillas/parser/blob/master/example_test.go

package parser_test

import (
	"errors"
	"fmt"
	"math"
	"strconv"

	"github.com/gomillas/parser"
)

func Example() {
	const src = "125 + 2 * (sqrt 9 - 1) - 3"

	m := parser.New(src)
	if result, err := mathExp(m, "="); err == nil {
		fmt.Println(result)
	} else {
		panic(
			fmt.Errorf("%s (line: %d, col: %d)", err.Error(), m.Line(), m.Column()),

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I would appreciate comments and if the code can be improved in some way.
Thanks.