491 lines
15 KiB
C++
491 lines
15 KiB
C++
#pragma once
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#include "jinja-lexer.h"
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#include "jinja-value.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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#include <sstream>
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namespace jinja {
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struct context {
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std::map<std::string, value> var;
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context() {
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var["true"] = mk_val<value_bool>(true);
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var["false"] = mk_val<value_bool>(false);
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var["none"] = mk_val<value_null>();
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}
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~context() = default;
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context(const context & parent) {
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// inherit variables (for example, when entering a new scope)
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for (const auto & pair : parent.var) {
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var[pair.first] = pair.second->clone();
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}
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}
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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 value execute(context &) { throw std::runtime_error("cannot exec " + type()); }
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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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};
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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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value execute(context &) override {
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throw std::runtime_error("Cannot execute program directly, use jinja::vm instead");
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}
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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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value 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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value 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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struct exception : public std::exception {
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const char* what() const noexcept override {
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return "Break statement executed";
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}
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};
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value execute(context &) override {
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throw break_statement::exception();
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}
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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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struct exception : public std::exception {
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const char* what() const noexcept override {
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return "Continue statement executed";
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}
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};
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value execute(context &) override {
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throw continue_statement::exception();
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}
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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 val;
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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)), val(std::move(value)), body(std::move(body)) {
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chk_type<expression>(this->assignee);
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chk_type<expression>(this->val);
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}
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std::string type() const override { return "Set"; }
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value 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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value execute(context & ctx) override;
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};
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struct comment_statement : public statement {
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std::string val;
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explicit comment_statement(const std::string & v) : val(v) {}
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std::string type() const override { return "Comment"; }
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value execute(context &) override {
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return mk_val<value_null>();
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}
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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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value execute(context & ctx) override;
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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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value execute(context & ctx) override;
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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 val;
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explicit identifier(const std::string & val) : val(val) {}
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std::string type() const override { return "Identifier"; }
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value execute(context & ctx) override;
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};
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// Literals
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struct integer_literal : public expression {
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int64_t val;
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explicit integer_literal(int64_t val) : val(val) {}
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std::string type() const override { return "IntegerLiteral"; }
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value execute(context &) override {
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return std::make_unique<value_int_t>(val);
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}
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};
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struct float_literal : public expression {
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double val;
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explicit float_literal(double val) : val(val) {}
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std::string type() const override { return "FloatLiteral"; }
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value execute(context &) override {
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return std::make_unique<value_float_t>(val);
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}
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};
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struct string_literal : public expression {
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std::string val;
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explicit string_literal(const std::string & val) : val(val) {}
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std::string type() const override { return "StringLiteral"; }
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value execute(context &) override {
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return std::make_unique<value_string_t>(val);
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}
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};
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struct array_literal : public expression {
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statements val;
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explicit array_literal(statements && val) : val(std::move(val)) {
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for (const auto& item : this->val) 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 val;
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explicit tuple_literal(statements && val) : val(std::move(val)) {
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for (const auto & item : this->val) 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>> val;
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explicit object_literal(std::vector<std::pair<statement_ptr, statement_ptr>> && val)
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: val(std::move(val)) {
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for (const auto & pair : this->val) {
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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 op;
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statement_ptr left;
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statement_ptr right;
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binary_expression(token 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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value execute(context & ctx) override;
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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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value execute(context & ctx) override;
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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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};
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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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* NOTE: "value is something" translates to function call "test_is_something(value)"
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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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value execute(context & ctx) override;
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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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value execute(context & ctx) override;
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};
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struct slice_expression : public expression {
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statement_ptr start_expr;
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statement_ptr stop_expr;
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statement_ptr step_expr;
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slice_expression(statement_ptr && start_expr, statement_ptr && stop_expr, statement_ptr && step_expr)
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: start_expr(std::move(start_expr)), stop_expr(std::move(stop_expr)), step_expr(std::move(step_expr)) {
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chk_type<expression>(this->start_expr);
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chk_type<expression>(this->stop_expr);
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chk_type<expression>(this->step_expr);
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}
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std::string type() const override { return "SliceExpression"; }
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value execute(context &) override {
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throw std::runtime_error("must be handled by MemberExpression");
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}
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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 val;
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keyword_argument_expression(statement_ptr && key, statement_ptr && val)
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: key(std::move(key)), val(std::move(val)) {
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chk_type<identifier>(this->key);
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chk_type<expression>(this->val);
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}
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std::string type() const override { return "KeywordArgumentExpression"; }
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value execute(context & ctx) override;
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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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};
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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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struct raised_exception : public std::exception {
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std::string message;
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raised_exception(const std::string & msg) : message(msg) {}
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const char* what() const noexcept override {
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return message.c_str();
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}
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};
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//////////////////////
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struct vm {
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context & ctx;
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explicit vm(context & ctx) : ctx(ctx) {}
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value_array execute(program & prog) {
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value_array results = mk_val<value_array>();
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for (auto & stmt : prog.body) {
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value res = stmt->execute(ctx);
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results->val_arr->push_back(std::move(res));
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}
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return results;
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}
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std::vector<jinja::string_part> gather_string_parts(const value & val) {
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std::vector<jinja::string_part> parts;
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gather_string_parts_recursive(val, parts);
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return parts;
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}
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void gather_string_parts_recursive(const value & val, std::vector<jinja::string_part> & parts) {
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if (is_val<value_string>(val)) {
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const auto & str_val = dynamic_cast<value_string_t*>(val.get())->val_str;
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for (const auto & part : str_val.parts) {
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parts.push_back(part);
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}
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} else if (is_val<value_array>(val)) {
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auto items = dynamic_cast<value_array_t*>(val.get())->val_arr.get();
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for (const auto & item : *items) {
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gather_string_parts_recursive(item, parts);
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}
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}
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}
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};
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} // namespace jinja
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