46 lines
1.4 KiB
C++
46 lines
1.4 KiB
C++
/*
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Copyright (c) 2013 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Author: Leonardo de Moura
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*/
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#include <initializer_list>
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namespace lean {
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static char g_safe_ascii[256];
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/**
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\brief Initializer for the \c g_safe_ascii table of "safe" ASCII characters.
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*/
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class init_safe_ascii {
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void set(int i, bool v) { g_safe_ascii[static_cast<unsigned char>(i)] = v; }
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public:
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init_safe_ascii() {
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for (int i = 0; i <= 255; i++)
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set(i, false);
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// digits and characters are safe
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for (int i = '0'; i <= '9'; i++) set(i, true);
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for (int i = 'a'; i <= 'z'; i++) set(i, true);
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for (int i = 'A'; i <= 'Z'; i++) set(i, true);
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// the following characters are also safe
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for (unsigned char b : {'_', ' ', '\t', '\r', '\n', '(', ')', '{', '}', ':', '.', ',', '\"', '\'', '`', '!', '#',
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'=', '<', '>', '@', '^', '|', '&', '~', '+', '-', '*', '/', '\\', '$', '%', '?', ';', '[', ']'})
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set(b, true);
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}
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};
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static init_safe_ascii g_init_safe_ascii;
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bool is_safe_ascii(char c) {
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return g_safe_ascii[static_cast<unsigned char>(c)];
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}
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bool is_safe_ascii(char const * str) {
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if (str) {
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while (*str != 0) {
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if (!is_safe_ascii(*str))
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return false;
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str++;
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}
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}
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return true;
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}
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}
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