mirror of https://github.com/ory/kratos
67 lines
1.2 KiB
Go
67 lines
1.2 KiB
Go
// Copyright © 2023 Ory Corp
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// SPDX-License-Identifier: Apache-2.0
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package x
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// IsValidNumber reports whether s is a valid JSON number literal.
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//
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// Taken from encoding/json
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func IsValidNumber(s string) bool {
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// This function implements the JSON numbers grammar.
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// See https://tools.ietf.org/html/rfc7159#section-6
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// and https://json.org/number.gif
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if s == "" {
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return false
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}
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// Optional -
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if s[0] == '-' {
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s = s[1:]
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if s == "" {
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return false
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}
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}
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// Digits
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switch {
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default:
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return false
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case s[0] == '0':
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s = s[1:]
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case '1' <= s[0] && s[0] <= '9':
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s = s[1:]
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for len(s) > 0 && '0' <= s[0] && s[0] <= '9' {
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s = s[1:]
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}
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}
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// . followed by 1 or more digits.
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if len(s) >= 2 && s[0] == '.' && '0' <= s[1] && s[1] <= '9' {
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s = s[2:]
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for len(s) > 0 && '0' <= s[0] && s[0] <= '9' {
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s = s[1:]
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}
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}
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// e or E followed by an optional - or + and
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// 1 or more digits.
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if len(s) >= 2 && (s[0] == 'e' || s[0] == 'E') {
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s = s[1:]
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if s[0] == '+' || s[0] == '-' {
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s = s[1:]
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if s == "" {
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return false
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}
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}
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for len(s) > 0 && '0' <= s[0] && s[0] <= '9' {
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s = s[1:]
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}
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}
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// Make sure we are at the end.
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return s == ""
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}
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