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path: root/go/wordy/wordy.go
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package wordy

import (
	"strconv"
	"strings"
)

type Op func(int, int) int

var m = map[string]Op{
	"plus":       func(a, b int) int { return a + b },
	"minus":      func(a, b int) int { return a - b },
	"multiplied": func(a, b int) int { return a * b },
	"divided":    func(a, b int) int { return a / b },
}

func Answer(s string) (int, bool) {
	if !strings.HasPrefix(s, "What is") || !strings.HasSuffix(s, "?") {
		return 0, false
	}
	var op Op
	var x int
	var didOp bool
	for _, v := range strings.Fields(s[8 : len(s)-1]) {
		if i, err := strconv.Atoi(v); err == nil {
			// got a number
			if op != nil {
				x = op(x, i)
				didOp = true
			} else {
				x = i
			}
		} else {
			// try to fetch operation
			if o, ok := m[v]; ok {
				op = o
			}
		}
	}
	return x, didOp
}