s0rg/fantasyname

package fantasyname

import (
    "fmt"
    "strings"

    "github.com/s0rg/fantasyname/wrappers"
)

// Compile creates fmt.Stringer from given pattern, you can call it as many times as
// you wish, it will produce new name on every call.
func Compile(pattern string, opts ...Option) (rv fmt.Stringer, err error) {
    if pattern = strings.TrimSpace(pattern); pattern == "" {
        return nil, ErrEmptyStack
    }

    p := newParser(opts...)

    for pos, r := range pattern {
        switch r {
        case '<':
            p.OnGroupStart(false)
        case '>':
            err = p.OnGroupEnd(false)
        case '(':
            p.OnGroupStart(true)
        case ')':
            err = p.OnGroupEnd(true)
        case '|':
            err = p.OnGroupSplit()
        case '!':
            err = p.Wrap(wrappers.Capitalized)
        case '~':
            err = p.Wrap(wrappers.Reversed)
        default:
            err = p.OnSymbol(r)
        }

        if err != nil {
            return nil, fmt.Errorf("pos: %d error: %w", pos, err)
        }
    }

    return p.Build()
}