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#include "vp_expr_check_node.h"
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#include "../../third_party/tinyexpr/tinyexpr.h"
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namespace vp_nodes {
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vp_expr_check_node::vp_expr_check_node(std::string node_name):vp_node(node_name) {
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this->initialized();
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}
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vp_expr_check_node::~vp_expr_check_node() {
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deinitialized();
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}
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std::shared_ptr<vp_objects::vp_meta> vp_expr_check_node::handle_frame_meta(std::shared_ptr<vp_objects::vp_frame_meta> meta) {
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for (auto& i: meta->text_targets) {
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auto& text = i->text;
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auto left_right = vp_utils::string_split(text, '=');
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// only deal with equation such as `1+1=2`, excluding `1+1` or `1+1=` or `=1+1`
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/*
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* 1. yes means equation is right
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* 2. no means equation is wrong
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* 3. invalid means expression is not valid
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*/
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if (left_right.size() == 2) {
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auto left = left_right[0];
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auto right = left_right[1];
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// replace specific symbols
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left = std::regex_replace(left, std::regex("x"), "*");
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left = std::regex_replace(left, std::regex("÷"), "/");
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//...
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if (left.empty()) {
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i->flags = "invalid";
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continue;
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}
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if (right.empty()) {
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i->flags = "invalid";
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continue;
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}
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double right_value;
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try {
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right_value = std::stod(right);
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}
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catch(const std::exception& e) {
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i->flags = "invalid";
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continue;
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}
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// parse and calculate the left part
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int error;
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auto cal_value = te_interp(left.c_str(), &error);
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if (error != 0) {
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i->flags = "invalid";
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continue;
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}
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if (cal_value == right_value) {
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i->flags = "yes_" + vp_utils::round_any(cal_value, 2);
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}
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else {
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i->flags = "no_" + vp_utils::round_any(cal_value, 2);
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}
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}
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else {
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i->flags = "invalid";
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}
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}
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return meta;
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}
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}
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