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Fancy printer predicate now takes current JSON object

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The API is ugly at the moment. Will fix with an ugly
implementation soon.
This commit is contained in:
Evan Driscoll 2018-06-04 21:59:21 -05:00
parent c7a64b8846
commit edb6b25569
3 changed files with 147 additions and 38 deletions
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56
include/nlohmann/detail/output/fancy_serializer.hpp
View File

@ -43,19 +43,31 @@ struct fancy_serializer_style
bool multiline = false;
void set_old_multiline()
{
space_after_colon = space_after_comma = multiline = true;
}
fancy_serializer_style() = default;
fancy_serializer_style(bool s_colon, bool s_comma, bool ml)
: space_after_colon(s_colon), space_after_comma(s_comma), multiline(ml)
{}
static const fancy_serializer_style preset_compact;
static const fancy_serializer_style preset_one_line;
static const fancy_serializer_style preset_multiline;
};
const fancy_serializer_style fancy_serializer_style::preset_compact(false, false, false);
const fancy_serializer_style fancy_serializer_style::preset_one_line(true, true, false);
const fancy_serializer_style fancy_serializer_style::preset_multiline(true, true, true);
template<typename BasicJsonType>
class basic_fancy_serializer_stylizer
{
public:
using string_t = typename BasicJsonType::string_t;
using json_pointer_t = json_pointer<BasicJsonType>;
using matcher_predicate = std::function<bool (const json_pointer_t&)>;
using json_matcher_predicate = std::function<bool (const BasicJsonType&)>;
using context_matcher_predicate = std::function<bool (const json_pointer_t&)>;
using matcher_predicate = std::function<bool (const json_pointer_t&, const BasicJsonType&)>;
basic_fancy_serializer_stylizer(fancy_serializer_style const& ds)
: default_style(ds)
@ -76,11 +88,12 @@ class basic_fancy_serializer_stylizer
const fancy_serializer_style* get_new_style_or_active(
const json_pointer_t& pointer,
const json& j,
const fancy_serializer_style* active_style) const
{
for (auto const& pair : styles)
{
if (pair.first(pointer))
if (pair.first(pointer, j))
{
return &pair.second;
}
@ -96,15 +109,40 @@ class basic_fancy_serializer_stylizer
return styles.back().second;
}
fancy_serializer_style& register_style(
json_matcher_predicate p,
fancy_serializer_style style = fancy_serializer_style())
{
auto wrapper = [p](const json_pointer_t&, const BasicJsonType & j)
{
return p(j);
};
styles.emplace_back(wrapper, style);
return styles.back().second;
}
fancy_serializer_style& register_style(
context_matcher_predicate p,
fancy_serializer_style style = fancy_serializer_style())
{
auto wrapper = [p](const json_pointer_t& c, const BasicJsonType&)
{
return p(c);
};
styles.emplace_back(wrapper, style);
return styles.back().second;
}
fancy_serializer_style& register_key_matcher_style(
string_t str,
fancy_serializer_style style = fancy_serializer_style())
{
return register_style([str](const json_pointer_t& pointer)
using pred = context_matcher_predicate;
return register_style(pred([str](const json_pointer_t& pointer)
{
return (pointer.cbegin() != pointer.cend())
&& (*pointer.crbegin() == str);
},
}),
style);
}
@ -180,7 +218,7 @@ class fancy_serializer
const fancy_serializer_style* active_style,
const json_pointer_t& context)
{
active_style = stylizer.get_new_style_or_active(context, active_style);
active_style = stylizer.get_new_style_or_active(context, val, active_style);
switch (val.m_type)
{

56
single_include/nlohmann/json.hpp
View File

@ -10848,19 +10848,31 @@ struct fancy_serializer_style
bool multiline = false;
void set_old_multiline()
{
space_after_colon = space_after_comma = multiline = true;
}
fancy_serializer_style() = default;
fancy_serializer_style(bool s_colon, bool s_comma, bool ml)
: space_after_colon(s_colon), space_after_comma(s_comma), multiline(ml)
{}
static const fancy_serializer_style preset_compact;
static const fancy_serializer_style preset_one_line;
static const fancy_serializer_style preset_multiline;
};
const fancy_serializer_style fancy_serializer_style::preset_compact(false, false, false);
const fancy_serializer_style fancy_serializer_style::preset_one_line(true, true, false);
const fancy_serializer_style fancy_serializer_style::preset_multiline(true, true, true);
template<typename BasicJsonType>
class basic_fancy_serializer_stylizer
{
public:
using string_t = typename BasicJsonType::string_t;
using json_pointer_t = json_pointer<BasicJsonType>;
using matcher_predicate = std::function<bool (const json_pointer_t&)>;
using json_matcher_predicate = std::function<bool (const BasicJsonType&)>;
using context_matcher_predicate = std::function<bool (const json_pointer_t&)>;
using matcher_predicate = std::function<bool (const json_pointer_t&, const BasicJsonType&)>;
basic_fancy_serializer_stylizer(fancy_serializer_style const& ds)
: default_style(ds)
@ -10881,11 +10893,12 @@ class basic_fancy_serializer_stylizer
const fancy_serializer_style* get_new_style_or_active(
const json_pointer_t& pointer,
const json& j,
const fancy_serializer_style* active_style) const
{
for (auto const& pair : styles)
{
if (pair.first(pointer))
if (pair.first(pointer, j))
{
return &pair.second;
}
@ -10901,15 +10914,40 @@ class basic_fancy_serializer_stylizer
return styles.back().second;
}
fancy_serializer_style& register_style(
json_matcher_predicate p,
fancy_serializer_style style = fancy_serializer_style())
{
auto wrapper = [p](const json_pointer_t&, const BasicJsonType & j)
{
return p(j);
};
styles.emplace_back(wrapper, style);
return styles.back().second;
}
fancy_serializer_style& register_style(
context_matcher_predicate p,
fancy_serializer_style style = fancy_serializer_style())
{
auto wrapper = [p](const json_pointer_t& c, const BasicJsonType&)
{
return p(c);
};
styles.emplace_back(wrapper, style);
return styles.back().second;
}
fancy_serializer_style& register_key_matcher_style(
string_t str,
fancy_serializer_style style = fancy_serializer_style())
{
return register_style([str](const json_pointer_t& pointer)
using pred = context_matcher_predicate;
return register_style(pred([str](const json_pointer_t& pointer)
{
return (pointer.cbegin() != pointer.cend())
&& (*pointer.crbegin() == str);
},
}),
style);
}
@ -10985,7 +11023,7 @@ class fancy_serializer
const fancy_serializer_style* active_style,
const json_pointer_t& context)
{
active_style = stylizer.get_new_style_or_active(context, active_style);
active_style = stylizer.get_new_style_or_active(context, val, active_style);
switch (val.m_type)
{

73
test/src/unit-fancy-serialization.cpp
View File

@ -203,7 +203,8 @@ TEST_CASE("serialization")
auto str_flat = fancy_to_string({1, {1}}, style);
CHECK(str_flat == "[1,[...]]");
style.set_old_multiline();
style = fancy_serializer_style::preset_multiline;
style.depth_limit = 1;
auto str_lines = fancy_to_string({1, {1}}, style);
CHECK(str_lines == dedent(R"(
[
@ -220,7 +221,8 @@ TEST_CASE("serialization")
auto str_flat = fancy_to_string({1, {{"one", 1}}}, style);
CHECK(str_flat == "[1,{...}]");
style.set_old_multiline();
style = fancy_serializer_style::preset_multiline;
style.depth_limit = 1;
auto str_lines = fancy_to_string({1, {{"one", 1}}}, style);
CHECK(str_lines == dedent(R"(
[
@ -235,8 +237,8 @@ TEST_CASE("serialization")
SECTION("can style objects of a key differently")
{
fancy_serializer_stylizer stylizer;
stylizer.get_default_style().set_old_multiline();
stylizer.register_key_matcher_style("one line").multiline = false;
stylizer.get_default_style() = fancy_serializer_style::preset_multiline;
stylizer.register_key_matcher_style("one line");
auto str = fancy_to_string(
{
@ -262,8 +264,8 @@ TEST_CASE("serialization")
SECTION("changes propagate (unless overridden)")
{
fancy_serializer_stylizer stylizer;
stylizer.get_default_style().set_old_multiline();
stylizer.register_key_matcher_style("one line").indent_step = 0;
stylizer.get_default_style() = fancy_serializer_style::preset_multiline;
stylizer.register_key_matcher_style("one line");
auto str = fancy_to_string(
{
@ -279,18 +281,20 @@ TEST_CASE("serialization")
})"));
}
SECTION("example of more sophisticated matcher")
SECTION("example of more sophisticated context matcher")
{
using pred = fancy_serializer_stylizer::context_matcher_predicate;
fancy_serializer_stylizer stylizer;
stylizer.get_default_style().set_old_multiline();
stylizer.get_default_style() = fancy_serializer_style::preset_multiline;
stylizer.register_style(
[] (const json_pointer<json>& context)
pred([] (const json_pointer<json>& context)
{
// Matches if context[-2] is "each elem on one line"
return (context.cend() - context.cbegin() >= 2)
&& (*(context.cend() - 2) == "each elem on one line");
}
})
).space_after_comma = true;
auto str = fancy_to_string(
@ -324,6 +328,40 @@ TEST_CASE("serialization")
]
})"));
}
SECTION("example of more sophisticated json matcher")
{
using pred = fancy_serializer_stylizer::json_matcher_predicate;
fancy_serializer_stylizer stylizer;
stylizer.get_default_style() = fancy_serializer_style::preset_multiline;
stylizer.register_style(
pred([] (const json & j)
{
return j.type() == json::value_t::array;
})
) = fancy_serializer_style::preset_one_line;
auto str = fancy_to_string(
{
{
"an array", {1, 2, 3}
},
{
"an object", {{"key", "val"}}
}
},
stylizer);
CHECK(str == dedent(R"(
{
"an array": [1, 2, 3],
"an object": {
"key": "val"
}
})"));
}
}
SECTION("Spaces after commas are controllable separately from multiline")
@ -346,8 +384,7 @@ TEST_CASE("serialization")
SECTION("multiline can have no space")
{
fancy_serializer_style style;
style.set_old_multiline();
fancy_serializer_style style = fancy_serializer_style::preset_multiline;
style.space_after_colon = false;
auto str = fancy_to_string({{"one", 1}}, style);
CHECK(str == dedent(R"(
@ -360,8 +397,7 @@ TEST_CASE("serialization")
SECTION("given width")
{
fancy_serializer_style style;
style.set_old_multiline();
fancy_serializer_style style = fancy_serializer_style::preset_multiline;
auto str = fancy_to_string({"foo", 1, 2, 3, false, {{"one", 1}}}, style);
CHECK(str == dedent(R"(
[
@ -378,10 +414,9 @@ TEST_CASE("serialization")
SECTION("given fill")
{
fancy_serializer_style style;
fancy_serializer_style style = fancy_serializer_style::preset_multiline;
style.indent_step = 1;
style.indent_char = '\t';
style.set_old_multiline();
auto str = fancy_to_string({"foo", 1, 2, 3, false, {{"one", 1}}}, style);
CHECK(str ==
@ -400,10 +435,9 @@ TEST_CASE("serialization")
SECTION("indent_char is honored for deep indents in lists")
{
fancy_serializer_style style;
fancy_serializer_style style = fancy_serializer_style::preset_multiline;
style.indent_step = 300;
style.indent_char = 'X';
style.set_old_multiline();
auto str = fancy_to_string({1, {1}}, style);
@ -419,10 +453,9 @@ TEST_CASE("serialization")
SECTION("indent_char is honored for deep indents in objects")
{
fancy_serializer_style style;
fancy_serializer_style style = fancy_serializer_style::preset_multiline;
style.indent_step = 300;
style.indent_char = 'X';
style.set_old_multiline();
auto str = fancy_to_string({{"key", {{"key", 1}}}}, style);