mirror of https://github.com/Wilfred/difftastic/
49 lines
1.2 KiB
Plaintext
49 lines
1.2 KiB
Plaintext
// Returns true if 'in' has the given prefix.
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export fn has_prefix(in: str, prefix: str) bool = {
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let a = toutf8(in), b = toutf8(prefix);
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if (len(a) < len(b)) {
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return false;
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};
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for (let i = 0z; i < len(b); i += 1) {
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if (a[i] != b[i]) {
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return false;
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};
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};
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return true;
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};
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@test fn prefix() void = {
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assert(has_prefix("abcde", "abc"));
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assert(has_prefix("abcde", "abcde"));
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assert(has_prefix("abcde", ""));
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assert(has_prefix("", ""));
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assert(!has_prefix("abcde", "cde"));
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assert(!has_prefix("abcde", "abcdefg"));
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assert(!has_prefix("", "abc"));
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};
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// Returns true if 'in' has the given prefix.
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export fn has_suffix(in: str, suff: str) bool = {
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let a = toutf8(in), b = toutf8(suff);
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if (len(a) < len(b)) {
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return false;
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};
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for (let i = 0z; i < len(b); i += 1) {
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if (a[len(a) - len(b) + i] != b[i]) {
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return false;
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};
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};
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return true;
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};
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@test fn suffix() void = {
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assert(has_suffix("abcde", "cde"));
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assert(has_suffix("abcde", "abcde"));
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assert(has_suffix("abcde", ""));
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assert(has_suffix("", ""));
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assert(has_suffix("abcde", ""));
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assert(!has_suffix("abcde", "abc"));
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assert(!has_suffix("abcde", "fabcde"));
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assert(!has_suffix("", "abc"));
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};
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