72 lines
1.7 KiB
Go
72 lines
1.7 KiB
Go
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package main
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import (
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"bufio"
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"fmt"
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"math/rand"
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"os"
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"strings"
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"time"
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)
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type LengthError struct {
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Count int
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}
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func (e LengthError) Error() string {
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return fmt.Sprintf("%d is not long enough (must be longer than 2)", e.Count)
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}
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func parse(words []string) (map[string][]string, string, error) {
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if len(words) < 3 {
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return nil, "", LengthError{len(words)}
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}
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mapping := make(map[string][]string)
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var a, b, k, v, first_prefix string
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for i := 0; i < len(words)-2; i++ {
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a = words[i]
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b = words[i+1]
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k = fmt.Sprintf("%v %v", a, b)
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if i == 0 {
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first_prefix = k
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}
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v = words[i+2]
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mapping[k] = append(mapping[k], v)
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}
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k = fmt.Sprintf("%v %v", words[len(words)-2], words[len(words)-1])
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v = "THE_END"
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mapping[k] = append(mapping[k], v)
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return mapping, first_prefix, nil
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}
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func generateText(mapping map[string][]string, first_prefix string) string {
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cur_prefix := first_prefix
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output := first_prefix
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for {
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suffix := mapping[cur_prefix][rand.Intn(len(mapping[cur_prefix]))]
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if suffix == "THE_END" {
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break
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}
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output += fmt.Sprintf(" %v", suffix)
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_prefix := strings.SplitN(cur_prefix, " ", 2)
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cur_prefix = fmt.Sprintf("%v %v", _prefix[1], suffix)
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}
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return output
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}
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func main() {
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rand.Seed(time.Now().UnixNano())
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instream := bufio.NewReader(os.Stdin)
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for s, err := instream.ReadBytes('\n'); err == nil; s, err = instream.ReadBytes('\n') {
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words := strings.Fields(string(s))
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mapping, first_prefix, err := parse(words)
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var generated_text string
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if err != nil {
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generated_text = err.Error()
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} else {
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generated_text = generateText(mapping, first_prefix)
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}
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fmt.Printf("%v\n\t%v\n\t%v\n", words, mapping, generated_text)
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}
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}
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