394 lines
12 KiB
C++
394 lines
12 KiB
C++
#include "jinja-lexer.h"
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#include <string>
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#include <vector>
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#include <cassert>
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#include <memory>
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namespace jinja {
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struct context {
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// TODO
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};
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/**
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* Base class for all nodes in the AST.
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*/
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struct statement {
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virtual ~statement() = default;
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virtual std::string type() const { return "Statement"; }
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virtual void execute(context & ctx) = 0;
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};
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using statement_ptr = std::unique_ptr<statement>;
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using statements = std::vector<statement_ptr>;
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// Type Checking Utilities
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template<typename T>
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static void chk_type(const statement_ptr & ptr) {
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if (!ptr) return; // Allow null for optional fields
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assert(dynamic_cast<T *>(ptr.get()) != nullptr);
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}
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template<typename T, typename U>
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static void chk_type(const statement_ptr & ptr) {
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if (!ptr) return;
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assert(dynamic_cast<T *>(ptr.get()) != nullptr || dynamic_cast<U *>(ptr.get()) != nullptr);
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}
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// Base Types
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/**
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* Expressions will result in a value at runtime (unlike statements).
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*/
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struct expression : public statement {
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std::string type() const override { return "Expression"; }
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void execute(context & ctx) override {}
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};
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// Statements
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struct program : public statement {
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statements body;
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explicit program(statements && body) : body(std::move(body)) {}
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std::string type() const override { return "Program"; }
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void execute(context & ctx) override {}
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};
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struct if_statement : public statement {
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statement_ptr test;
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statements body;
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statements alternate;
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if_statement(statement_ptr && test, statements && body, statements && alternate)
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: test(std::move(test)), body(std::move(body)), alternate(std::move(alternate)) {
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chk_type<expression>(this->test);
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}
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std::string type() const override { return "If"; }
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void execute(context & ctx) override {}
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};
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struct identifier;
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struct tuple_literal;
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/**
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* Loop over each item in a sequence
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* https://jinja.palletsprojects.com/en/3.0.x/templates/#for
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*/
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struct for_statement : public statement {
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statement_ptr loopvar; // Identifier | TupleLiteral
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statement_ptr iterable;
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statements body;
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statements default_block; // if no iteration took place
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for_statement(statement_ptr && loopvar, statement_ptr && iterable, statements && body, statements && default_block)
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: loopvar(std::move(loopvar)), iterable(std::move(iterable)),
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body(std::move(body)), default_block(std::move(default_block)) {
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chk_type<identifier, tuple_literal>(this->loopvar);
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chk_type<expression>(this->iterable);
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}
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std::string type() const override { return "For"; }
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void execute(context & ctx) override {}
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};
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struct break_statement : public statement {
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std::string type() const override { return "Break"; }
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void execute(context & ctx) override {}
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};
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struct continue_statement : public statement {
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std::string type() const override { return "Continue"; }
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void execute(context & ctx) override {}
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};
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struct set_statement : public statement {
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statement_ptr assignee;
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statement_ptr value;
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statements body;
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set_statement(statement_ptr && assignee, statement_ptr && value, statements && body)
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: assignee(std::move(assignee)), value(std::move(value)), body(std::move(body)) {
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chk_type<expression>(this->assignee);
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chk_type<expression>(this->value);
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}
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std::string type() const override { return "Set"; }
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void execute(context & ctx) override {}
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};
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struct macro_statement : public statement {
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statement_ptr name;
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statements args;
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statements body;
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macro_statement(statement_ptr && name, statements && args, statements && body)
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: name(std::move(name)), args(std::move(args)), body(std::move(body)) {
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chk_type<identifier>(this->name);
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for (const auto& arg : this->args) chk_type<expression>(arg);
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}
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std::string type() const override { return "Macro"; }
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void execute(context & ctx) override {}
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};
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struct comment_statement : public statement {
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std::string value;
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explicit comment_statement(const std::string & value) : value(value) {}
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std::string type() const override { return "Comment"; }
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void execute(context & ctx) override {}
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};
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// Expressions
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struct member_expression : public expression {
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statement_ptr object;
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statement_ptr property;
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bool computed;
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member_expression(statement_ptr && object, statement_ptr && property, bool computed)
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: object(std::move(object)), property(std::move(property)), computed(computed) {
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chk_type<expression>(this->object);
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chk_type<expression>(this->property);
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}
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std::string type() const override { return "MemberExpression"; }
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};
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struct call_expression : public expression {
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statement_ptr callee;
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statements args;
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call_expression(statement_ptr && callee, statements && args)
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: callee(std::move(callee)), args(std::move(args)) {
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chk_type<expression>(this->callee);
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for (const auto& arg : this->args) chk_type<expression>(arg);
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}
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std::string type() const override { return "CallExpression"; }
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};
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/**
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* Represents a user-defined variable or symbol in the template.
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*/
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struct identifier : public expression {
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std::string value;
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explicit identifier(const std::string & value) : value(value) {}
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std::string type() const override { return "Identifier"; }
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};
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// Literals
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/**
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* Abstract base class for all Literal expressions.
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* Should not be instantiated directly.
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*/
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template <typename T>
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struct literal : public expression {
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T value;
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explicit literal(T && value) : value(std::move(value)) {}
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std::string type() const override { return "Literal"; }
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};
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struct integer_literal : public literal<int64_t> {
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std::string type() const override { return "IntegerLiteral"; }
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};
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struct float_literal : public literal<double> {
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std::string type() const override { return "FloatLiteral"; }
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};
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struct string_literal : public literal<std::string> {
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std::string type() const override { return "StringLiteral"; }
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};
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struct array_literal : public expression {
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statements value;
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explicit array_literal(statements && value) : value(std::move(value)) {
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for (const auto& item : this->value) chk_type<expression>(item);
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}
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std::string type() const override { return "ArrayLiteral"; }
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};
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struct tuple_literal : public expression {
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statements value;
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explicit tuple_literal(statements && value) : value(std::move(value)) {
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for (const auto& item : this->value) chk_type<expression>(item);
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}
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std::string type() const override { return "TupleLiteral"; }
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};
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struct object_literal : public expression {
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std::vector<std::pair<statement_ptr, statement_ptr>> value;
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explicit object_literal(std::vector<std::pair<statement_ptr, statement_ptr>> && value)
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: value(std::move(value)) {
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for (const auto & pair : this->value) {
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chk_type<expression>(pair.first);
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chk_type<expression>(pair.second);
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}
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}
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std::string type() const override { return "ObjectLiteral"; }
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};
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// Complex Expressions
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/**
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* An operation with two sides, separated by an operator.
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* Note: Either side can be a Complex Expression, with order
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* of operations being determined by the operator.
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*/
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struct binary_expression : public expression {
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token::type op;
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statement_ptr left;
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statement_ptr right;
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binary_expression(token::type op, statement_ptr && left, statement_ptr && right)
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: op(op), left(std::move(left)), right(std::move(right)) {
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chk_type<expression>(this->left);
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chk_type<expression>(this->right);
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}
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std::string type() const override { return "BinaryExpression"; }
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};
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/**
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* An operation with two sides, separated by the | operator.
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* Operator precedence: https://github.com/pallets/jinja/issues/379#issuecomment-168076202
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*/
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struct filter_expression : public expression {
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statement_ptr operand;
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statement_ptr filter;
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filter_expression(statement_ptr && operand, statement_ptr && filter)
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: operand(std::move(operand)), filter(std::move(filter)) {
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chk_type<expression>(this->operand);
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chk_type<identifier, call_expression>(this->filter);
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}
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std::string type() const override { return "FilterExpression"; }
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};
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struct filter_statement : public statement {
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statement_ptr filter;
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statements body;
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filter_statement(statement_ptr && filter, statements && body)
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: filter(std::move(filter)), body(std::move(body)) {
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chk_type<identifier, call_expression>(this->filter);
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}
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std::string type() const override { return "FilterStatement"; }
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void execute(context & ctx) override {}
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};
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/**
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* An operation which filters a sequence of objects by applying a test to each object,
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* and only selecting the objects with the test succeeding.
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*
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* It may also be used as a shortcut for a ternary operator.
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*/
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struct select_expression : public expression {
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statement_ptr lhs;
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statement_ptr test;
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select_expression(statement_ptr && lhs, statement_ptr && test)
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: lhs(std::move(lhs)), test(std::move(test)) {
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chk_type<expression>(this->lhs);
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chk_type<expression>(this->test);
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}
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std::string type() const override { return "SelectExpression"; }
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};
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/**
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* An operation with two sides, separated by the "is" operator.
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*/
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struct test_expression : public expression {
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statement_ptr operand;
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bool negate;
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statement_ptr test;
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test_expression(statement_ptr && operand, bool negate, statement_ptr && test)
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: operand(std::move(operand)), negate(negate), test(std::move(test)) {
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chk_type<expression>(this->operand);
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chk_type<identifier>(this->test);
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}
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std::string type() const override { return "TestExpression"; }
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};
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/**
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* An operation with one side (operator on the left).
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*/
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struct unary_expression : public expression {
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token op;
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statement_ptr argument;
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unary_expression(token op, statement_ptr && argument)
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: op(std::move(op)), argument(std::move(argument)) {
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chk_type<expression>(this->argument);
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}
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std::string type() const override { return "UnaryExpression"; }
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};
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struct slice_expression : public expression {
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statement_ptr start;
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statement_ptr stop;
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statement_ptr step;
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slice_expression(statement_ptr && start, statement_ptr && stop, statement_ptr && step)
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: start(std::move(start)), stop(std::move(stop)), step(std::move(step)) {
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chk_type<expression>(this->start);
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chk_type<expression>(this->stop);
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chk_type<expression>(this->step);
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}
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std::string type() const override { return "SliceExpression"; }
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};
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struct keyword_argument_expression : public expression {
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statement_ptr key;
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statement_ptr value;
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keyword_argument_expression(statement_ptr && key, statement_ptr && value)
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: key(std::move(key)), value(std::move(value)) {
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chk_type<identifier>(this->key);
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chk_type<expression>(this->value);
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}
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std::string type() const override { return "KeywordArgumentExpression"; }
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};
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struct spread_expression : public expression {
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statement_ptr argument;
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explicit spread_expression(statement_ptr && argument) : argument(std::move(argument)) {
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chk_type<expression>(this->argument);
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}
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std::string type() const override { return "SpreadExpression"; }
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};
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struct call_statement : public statement {
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statement_ptr call;
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statements caller_args;
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statements body;
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call_statement(statement_ptr && call, statements && caller_args, statements && body)
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: call(std::move(call)), caller_args(std::move(caller_args)), body(std::move(body)) {
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chk_type<call_expression>(this->call);
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for (const auto& arg : this->caller_args) chk_type<expression>(arg);
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}
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std::string type() const override { return "CallStatement"; }
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void execute(context & ctx) override {}
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};
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struct ternary_expression : public expression {
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statement_ptr condition;
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statement_ptr true_expr;
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statement_ptr false_expr;
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ternary_expression(statement_ptr && condition, statement_ptr && true_expr, statement_ptr && false_expr)
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: condition(std::move(condition)), true_expr(std::move(true_expr)), false_expr(std::move(false_expr)) {
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chk_type<expression>(this->condition);
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chk_type<expression>(this->true_expr);
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chk_type<expression>(this->false_expr);
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}
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std::string type() const override { return "Ternary"; }
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};
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} // namespace jinja
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