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Add Jinja support for "indent" string filter (#19529)

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* Add partial Jinja support for "indent" string filter

* Fully implement indent

* Add tests for all width variants.

* Update tests/test-jinja.cpp

Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@scala.com>

* Fix getline ignoring trailing newlines

* Update common/jinja/value.cpp

Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@scala.com>

* fix first indent condition

---------

Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@scala.com>
This commit is contained in:
Piotr Wilkin (ilintar)
2026-02-19 00:25:52 +01:00
committed by GitHub
parent e7f2f95c9a
commit 8a70973557
2 changed files with 83 additions and 2 deletions
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common/jinja/value.cpp
+41 -2
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@@ -4,6 +4,7 @@
// for converting from JSON to jinja values
#include <nlohmann/json.hpp>
#include <sstream>
#include <string>
#include <cctype>
#include <vector>
@@ -715,8 +716,46 @@ const func_builtins & value_string_t::get_builtins() const {
return args.get_pos(0);
}},
{"tojson", tojson},
{"indent", [](const func_args &) -> value {
throw not_implemented_exception("String indent builtin not implemented");
{"indent", [](const func_args &args) -> value {
args.ensure_count(1, 4);
value val_input = args.get_pos(0);
value val_width = args.get_kwarg_or_pos("width", 1);
const bool first = args.get_kwarg_or_pos("first", 2)->as_bool(); // undefined == false
const bool blank = args.get_kwarg_or_pos("blank", 3)->as_bool(); // undefined == false
if (!is_val<value_string>(val_input)) {
throw raised_exception("indent() first argument must be a string");
}
std::string indent;
if (is_val<value_int>(val_width)) {
indent.assign(val_width->as_int(), ' ');
} else if (is_val<value_string>(val_width)) {
indent = val_width->as_string().str();
} else {
indent = " ";
}
std::string indented;
std::string input = val_input->as_string().str();
std::istringstream iss = std::istringstream(input);
std::string line;
while (std::getline(iss, line)) {
if (!indented.empty()) {
indented.push_back('\n');
}
if ((indented.empty() ? first : (!line.empty() || blank))) {
indented += indent;
}
indented += line;
}
if (!input.empty() && input.back() == '\n') {
indented.push_back('\n');
if (blank) {
indented += indent;
}
}
auto res = mk_val<value_string>(indented);
res->val_str.mark_input_based_on(val_input->as_string());
return res;
}},
{"join", [](const func_args &) -> value {
throw not_implemented_exception("String join builtin not implemented");