mirror of
https://github.com/MontFerret/ferret.git
synced 2024-12-16 11:37:36 +02:00
110 lines
2.5 KiB
Go
110 lines
2.5 KiB
Go
package strings
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import (
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"context"
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"github.com/MontFerret/ferret/pkg/runtime/core"
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"github.com/MontFerret/ferret/pkg/runtime/values"
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)
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// Substring returns a substring of value.
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// @params value (String) - The source string.
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// @param offset (Int) - Start at offset, offsets start at position 0.
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// @param length (Int, optional) - At most length characters, omit to get the substring from offset to the end of the string. Optional.
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// @returns substring (String) - A substring of value.
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func Substring(_ context.Context, args ...core.Value) (core.Value, error) {
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err := core.ValidateArgs(args, 2, 3)
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if err != nil {
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return values.EmptyString, err
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}
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err = core.ValidateType(args[1], core.IntType)
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if err != nil {
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return values.EmptyString, err
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}
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text := args[0].String()
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runes := []rune(text)
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size := len(runes)
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offset := int(args[1].(values.Int))
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length := size
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if len(args) > 2 {
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if args[2].Type() == core.IntType {
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length = int(args[2].(values.Int))
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}
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}
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var substr []rune
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if length == size {
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substr = runes[offset:]
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} else {
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end := offset + length
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if size > end {
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substr = runes[offset:end]
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} else {
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substr = runes[offset:]
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}
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}
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return values.NewStringFromRunes(substr), nil
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}
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// Left returns the leftmost characters of the string value by index.
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// @param src (String) - The source string.
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// @params length (Int) - The amount of characters to return.
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// @returns substr (String)
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func Left(_ context.Context, args ...core.Value) (core.Value, error) {
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err := core.ValidateArgs(args, 2, 2)
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if err != nil {
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return values.EmptyString, err
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}
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text := args[0].String()
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runes := []rune(text)
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var pos int
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if args[1].Type() == core.IntType {
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pos = int(args[1].(values.Int))
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}
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if len(text) < pos {
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return values.NewString(text), nil
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}
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return values.NewStringFromRunes(runes[0:pos]), nil
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}
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// Right returns the rightmost characters of the string value.
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// @param src (String) - The source string.
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// @params length (Int) - The amount of characters to return.
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// @returns substr (String)
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func Right(_ context.Context, args ...core.Value) (core.Value, error) {
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err := core.ValidateArgs(args, 2, 2)
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if err != nil {
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return values.EmptyString, err
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}
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text := args[0].String()
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runes := []rune(text)
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size := len(runes)
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pos := size
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if args[1].Type() == core.IntType {
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pos = int(args[1].(values.Int))
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}
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if len(text) < pos {
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return values.NewString(string(text)), nil
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}
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return values.NewStringFromRunes(runes[size-pos : size]), nil
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}
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