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Allow json pointer syntax #272

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Allow json pointer syntax #272

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e4e7fdc
allow json pointer syntax
jbohanon Jun 16, 2023
01afe10
revert unwanted formatting changes
jbohanon Jun 16, 2023
5a18986
revert unwanted formatting changes
jbohanon Jun 16, 2023
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6 changes: 6 additions & 0 deletions include/inja/config.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,8 @@

namespace inja {

enum class ElementNotation { Dot, Pointer };

/*!
* \brief Class for lexer configuration.
*/
Expand All @@ -28,6 +30,8 @@ struct LexerConfig {
std::string comment_close_force_rstrip {"-#}"};
std::string open_chars {"#{"};

ElementNotation notation {ElementNotation::Dot};

bool trim_blocks {false};
bool lstrip_blocks {false};

Expand Down Expand Up @@ -64,6 +68,8 @@ struct LexerConfig {
* \brief Class for parser configuration.
*/
struct ParserConfig {
ElementNotation notation {ElementNotation::Dot};

bool search_included_templates_in_files {true};

std::function<Template(const std::string&, const std::string&)> include_callback;
Expand Down
5 changes: 5 additions & 0 deletions include/inja/environment.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -82,6 +82,11 @@ class Environment {
void set_lstrip_blocks(bool lstrip_blocks) {
lexer_config.lstrip_blocks = lstrip_blocks;
}
/// Sets the element notation syntax
void set_element_notation(ElementNotation notation) {
parser_config.notation = notation;
lexer_config.notation = notation;
}

/// Sets the element notation syntax
void set_search_included_templates_in_files(bool search_in_files) {
Expand Down
5 changes: 3 additions & 2 deletions include/inja/lexer.hpp
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Expand Up @@ -81,7 +81,7 @@ class Lexer {
}

pos = tok_start + 1;
if (std::isalpha(ch)) {
if (std::isalpha(ch) || ch == '~') {
minus_state = MinusState::Operator;
return scan_id();
}
Expand Down Expand Up @@ -177,12 +177,13 @@ class Lexer {
}

Token scan_id() {
bool isDotNotation = config.notation == ElementNotation::Dot;
for (;;) {
if (pos >= m_in.size()) {
break;
}
const char ch = m_in[pos];
if (!std::isalnum(ch) && ch != '.' && ch != '/' && ch != '_' && ch != '-') {
if (!std::isalnum(ch) && ch != '.' && ch != '/' && ch != '_' && ch != '-' && (isDotNotation || ch != '~')) {
break;
}
pos += 1;
Expand Down
18 changes: 18 additions & 0 deletions include/inja/node.hpp
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Expand Up @@ -10,6 +10,11 @@

namespace inja {

enum NotationFlag {
Dot = 0x00,
Pointer = 0x01,
};

class NodeVisitor;
class BlockNode;
class TextNode;
Expand Down Expand Up @@ -110,6 +115,15 @@ class DataNode : public ExpressionNode {
const std::string name;
const json::json_pointer ptr;

static std::string get_ptr(std::string_view ptr_name, NotationFlag notation) {
auto ptr = notation == NotationFlag::Dot ? convert_dot_to_ptr(ptr_name) : ptr_name.data();
if(ptr.substr(0,1) != "/") {
ptr = "/" + ptr;
}

return ptr;
}

static std::string convert_dot_to_ptr(std::string_view ptr_name) {
std::string result;
do {
Expand All @@ -123,6 +137,10 @@ class DataNode : public ExpressionNode {

explicit DataNode(std::string_view ptr_name, size_t pos): ExpressionNode(pos), name(ptr_name), ptr(json::json_pointer(convert_dot_to_ptr(ptr_name))) {}

explicit DataNode(std::string_view ptr_name, size_t pos, NotationFlag notation)
: ExpressionNode(pos), name(ptr_name),
ptr(json::json_pointer(get_ptr(ptr_name, notation))) {}

void accept(NodeVisitor& v) const {
v.visit(*this);
}
Expand Down
3 changes: 2 additions & 1 deletion include/inja/parser.hpp
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Expand Up @@ -237,7 +237,8 @@ class Parser {

// Variables
} else {
arguments.emplace_back(std::make_shared<DataNode>(static_cast<std::string>(tok.text), tok.text.data() - tmpl.content.c_str()));
auto notation = this->config.notation == ElementNotation::Dot ? NotationFlag::Dot : NotationFlag::Pointer;
arguments.emplace_back(std::make_shared<DataNode>(static_cast<std::string>(tok.text), tok.text.data() - tmpl.content.c_str(), notation));
}

// Operators
Expand Down
37 changes: 34 additions & 3 deletions single_include/inja/inja.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -348,6 +348,11 @@ inline void replace_substring(std::string& s, const std::string& f, const std::s

namespace inja {

enum NotationFlag {
Dot = 0x00,
Pointer = 0x01,
};

class NodeVisitor;
class BlockNode;
class TextNode;
Expand Down Expand Up @@ -448,6 +453,15 @@ class DataNode : public ExpressionNode {
const std::string name;
const json::json_pointer ptr;

static std::string get_ptr(std::string_view ptr_name, NotationFlag notation) {
auto ptr = notation == NotationFlag::Dot ? convert_dot_to_ptr(ptr_name) : ptr_name.data();
if(ptr.substr(0,1) != "/") {
ptr = "/" + ptr;
}

return ptr;
}

static std::string convert_dot_to_ptr(std::string_view ptr_name) {
std::string result;
do {
Expand All @@ -461,6 +475,10 @@ class DataNode : public ExpressionNode {

explicit DataNode(std::string_view ptr_name, size_t pos): ExpressionNode(pos), name(ptr_name), ptr(json::json_pointer(convert_dot_to_ptr(ptr_name))) {}

explicit DataNode(std::string_view ptr_name, size_t pos, NotationFlag notation)
: ExpressionNode(pos), name(ptr_name),
ptr(json::json_pointer(get_ptr(ptr_name, notation))) {}

void accept(NodeVisitor& v) const {
v.visit(*this);
}
Expand Down Expand Up @@ -816,6 +834,8 @@ using TemplateStorage = std::map<std::string, Template>;

namespace inja {

enum class ElementNotation { Dot, Pointer };

/*!
* \brief Class for lexer configuration.
*/
Expand All @@ -836,6 +856,8 @@ struct LexerConfig {
std::string comment_close_force_rstrip {"-#}"};
std::string open_chars {"#{"};

ElementNotation notation {ElementNotation::Dot};

bool trim_blocks {false};
bool lstrip_blocks {false};

Expand Down Expand Up @@ -872,6 +894,8 @@ struct LexerConfig {
* \brief Class for parser configuration.
*/
struct ParserConfig {
ElementNotation notation {ElementNotation::Dot};

bool search_included_templates_in_files {true};

std::function<Template(const std::string&, const std::string&)> include_callback;
Expand Down Expand Up @@ -1066,7 +1090,7 @@ class Lexer {
}

pos = tok_start + 1;
if (std::isalpha(ch)) {
if (std::isalpha(ch) || ch == '~') {
minus_state = MinusState::Operator;
return scan_id();
}
Expand Down Expand Up @@ -1162,12 +1186,13 @@ class Lexer {
}

Token scan_id() {
bool isDotNotation = config.notation == ElementNotation::Dot;
for (;;) {
if (pos >= m_in.size()) {
break;
}
const char ch = m_in[pos];
if (!std::isalnum(ch) && ch != '.' && ch != '/' && ch != '_' && ch != '-') {
if (!std::isalnum(ch) && ch != '.' && ch != '/' && ch != '_' && ch != '-' && (isDotNotation || ch != '~')) {
break;
}
pos += 1;
Expand Down Expand Up @@ -1649,7 +1674,8 @@ class Parser {

// Variables
} else {
arguments.emplace_back(std::make_shared<DataNode>(static_cast<std::string>(tok.text), tok.text.data() - tmpl.content.c_str()));
auto notation = this->config.notation == ElementNotation::Dot ? NotationFlag::Dot : NotationFlag::Pointer;
arguments.emplace_back(std::make_shared<DataNode>(static_cast<std::string>(tok.text), tok.text.data() - tmpl.content.c_str(), notation));
}

// Operators
Expand Down Expand Up @@ -2771,6 +2797,11 @@ class Environment {
void set_lstrip_blocks(bool lstrip_blocks) {
lexer_config.lstrip_blocks = lstrip_blocks;
}
/// Sets the element notation syntax
void set_element_notation(ElementNotation notation) {
parser_config.notation = notation;
lexer_config.notation = notation;
}

/// Sets the element notation syntax
void set_search_included_templates_in_files(bool search_in_files) {
Expand Down
9 changes: 9 additions & 0 deletions test/test-renderer.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,9 @@ TEST_CASE("types") {
data["relatives"]["brother"] = "Chris";
data["relatives"]["sister"] = "Jenny";
data["vars"] = {2, 3, 4, 0, -1, -2, -3};
data["json_pointers"]["example.com"] = "online";
data["json_pointers"]["and/or"] = "slash";
data["json_pointers"]["and~or"] = "tilde";

SUBCASE("basic") {
CHECK(env.render("", data) == "");
Expand All @@ -39,6 +42,12 @@ TEST_CASE("types") {
CHECK(env.render("{{ @name }}", data) == "@name");
CHECK(env.render("{{ $name }}", data) == "$name");

env.set_element_notation(inja::ElementNotation::Pointer);
CHECK(env.render("{{ json_pointers/example.com }}", data) == "online");
CHECK(env.render("{{ json_pointers/and~1or }}", data) == "slash");
CHECK(env.render("{{ json_pointers/and~0or }}", data) == "tilde");
env.set_element_notation(inja::ElementNotation::Dot);

CHECK_THROWS_WITH(env.render("{{unknown}}", data), "[inja.exception.render_error] (at 1:3) variable 'unknown' not found");
}

Expand Down