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55 lines
1.6 KiB
55 lines
1.6 KiB
/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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file Copyright.txt or https://cmake.org/licensing for details. */
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#include "cmPlaceholderExpander.h"
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#include <cctype>
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std::string& cmPlaceholderExpander::ExpandVariables(std::string& s)
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{
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std::string::size_type start = s.find('<');
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// no variables to expand
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if (start == std::string::npos) {
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return s;
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}
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std::string::size_type pos = 0;
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std::string expandedInput;
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while (start != std::string::npos && start < s.size() - 2) {
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std::string::size_type end = s.find('>', start);
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// if we find a < with no > we are done
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if (end == std::string::npos) {
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s = expandedInput;
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return s;
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}
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char c = s[start + 1];
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// if the next char after the < is not A-Za-z then
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// skip it and try to find the next < in the string
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if (!isalpha(c)) {
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start = s.find('<', start + 1);
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} else {
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// extract the var
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std::string var = s.substr(start + 1, end - start - 1);
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std::string replace = this->ExpandVariable(var);
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expandedInput += s.substr(pos, start - pos);
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// Prevent consecutive whitespace in the output if the rule variable
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// expands to an empty string.
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bool consecutive = replace.empty() && start > 0 && s[start - 1] == ' ' &&
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end + 1 < s.size() && s[end + 1] == ' ';
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if (consecutive) {
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expandedInput.pop_back();
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}
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expandedInput += replace;
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// move to next one
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start = s.find('<', start + var.size() + 2);
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pos = end + 1;
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}
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}
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// add the rest of the input
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expandedInput += s.substr(pos, s.size() - pos);
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s = expandedInput;
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return s;
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}
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