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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "replace_variable.h"
#include "asciistream.h"
#include <ctype.h>
namespace vespalib {
vespalib::string
replace_variable(const vespalib::string &input,
const vespalib::string &variable,
const vespalib::string &replacement)
{
vespalib::asciistream result;
bool is_in_word = false;
size_t last_word_start = 0;
size_t last_word_size = 0;
for (size_t i = 0; i < input.size(); ++i) {
char c = input[i];
if (isalnum(c) || (c == '_')) {
if (! is_in_word) {
last_word_start = i;
last_word_size = 0;
is_in_word = true;
}
++last_word_size;
} else {
if (is_in_word) {
vespalib::string last_word = input.substr(last_word_start, last_word_size);
if (last_word == variable) {
result << replacement;
} else {
result << last_word;
}
is_in_word = false;
}
result << c;
}
}
if (is_in_word) {
vespalib::string last_word = input.substr(last_word_start, last_word_size);
if (last_word == variable) {
result << replacement;
} else {
result << last_word;
}
}
return result.str();
}
} // namespace
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