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ferret/pkg/stdlib/strings/find.go

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package strings
import (
"context"
"github.com/MontFerret/ferret/pkg/runtime/core"
"github.com/MontFerret/ferret/pkg/runtime/values"
"strings"
)
/*
* Returns the position of the first occurrence of the string search inside the string text. Positions start at 0.
* @param src (String) - The source string.
* @param search (String) - The string to seek.
* @param start (Int, optional) - Limit the search to a subset of the text, beginning at start.
* @param end (Int, optional) - Limit the search to a subset of the text, ending at end
* @returns (Int) - The character position of the match.
* If search is not contained in text, -1 is returned. If search is empty, start is returned.
*/
func FindFirst(_ context.Context, args ...core.Value) (core.Value, error) {
err := core.ValidateArgs(args, 2, 4)
if err != nil {
return values.NewInt(-1), err
}
argsCount := len(args)
text := args[0].String()
runes := []rune(text)
search := args[1].String()
start := values.NewInt(0)
end := values.NewInt(int(len(text)))
if argsCount == 3 {
arg3 := args[2]
if arg3.Type() == core.IntType {
start = arg3.(values.Int)
}
}
if argsCount == 4 {
arg4 := args[3]
if arg4.Type() == core.IntType {
end = arg4.(values.Int)
}
}
found := strings.Index(string(runes[start:end]), search)
if found > -1 {
return values.NewInt(found + int(start)), nil
}
return values.NewInt(found), nil
}
/*
* Returns the position of the last occurrence of the string search inside the string text. Positions start at 0.
* @param src (String) - The source string.
* @param search (String) - The string to seek.
* @param start (Int, optional) - Limit the search to a subset of the text, beginning at start.
* @param end (Int, optional) - Limit the search to a subset of the text, ending at end
* @returns (Int) - The character position of the match.
* If search is not contained in text, -1 is returned. If search is empty, start is returned.
*/
func FindLast(_ context.Context, args ...core.Value) (core.Value, error) {
err := core.ValidateArgs(args, 2, 4)
if err != nil {
return values.NewInt(-1), err
}
argsCount := len(args)
text := args[0].String()
runes := []rune(text)
search := args[1].String()
start := values.NewInt(0)
end := values.NewInt(int(len(text)))
if argsCount == 3 {
arg3 := args[2]
if arg3.Type() == core.IntType {
start = arg3.(values.Int)
}
}
if argsCount == 4 {
arg4 := args[3]
if arg4.Type() == core.IntType {
end = arg4.(values.Int)
}
}
found := strings.LastIndex(string(runes[start:end]), search)
if found > -1 {
return values.NewInt(found + int(start)), nil
}
return values.NewInt(found), nil
}