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https://github.com/RGBCube/serenity
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js: Implement some modest pretty-printing of values
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1 changed files with 70 additions and 1 deletions
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@ -32,6 +32,7 @@
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#include <LibJS/AST.h>
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#include <LibJS/Interpreter.h>
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#include <LibJS/Parser.h>
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#include <LibJS/Runtime/Array.h>
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#include <LibJS/Runtime/Object.h>
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#include <LibJS/Runtime/PrimitiveString.h>
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#include <LibJS/Runtime/Value.h>
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@ -92,6 +93,74 @@ String read_next_piece()
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return piece.to_string();
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}
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static void print_value(JS::Value value, HashTable<JS::Object*>& seen_objects);
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static void print_array(const JS::Array* array, HashTable<JS::Object*>& seen_objects)
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{
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fputs("[ ", stdout);
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for (size_t i = 0; i < array->elements().size(); ++i) {
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print_value(array->elements()[i], seen_objects);
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if (i != array->elements().size() - 1)
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fputs(", ", stdout);
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}
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fputs(" ]", stdout);
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}
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static void print_object(const JS::Object* object, HashTable<JS::Object*>& seen_objects)
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{
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fputs("{ ", stdout);
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size_t index = 0;
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for (auto& it : object->own_properties()) {
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printf("\"\033[33;1m%s\033[0m\": ", it.key.characters());
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print_value(it.value, seen_objects);
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if (index != object->own_properties().size() - 1)
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fputs(", ", stdout);
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++index;
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}
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fputs(" }", stdout);
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}
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void print_value(JS::Value value, HashTable<JS::Object*>& seen_objects)
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{
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if (value.is_object()) {
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if (seen_objects.contains(value.as_object())) {
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// FIXME: Maybe we should only do this for circular references,
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// not for all reoccurring objects.
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printf("<already printed Object %p>", value.as_object());
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return;
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}
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seen_objects.set(value.as_object());
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}
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if (value.is_array())
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return print_array(static_cast<const JS::Array*>(value.as_object()), seen_objects);
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if (value.is_object())
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return print_object(value.as_object(), seen_objects);
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if (value.is_string())
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printf("\033[31;1m");
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else if (value.is_number())
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printf("\033[35;1m");
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else if (value.is_boolean())
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printf("\033[32;1m");
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else if (value.is_null() || value.is_undefined())
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printf("\033[34;1m");
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if (value.is_string())
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putchar('"');
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printf("%s", value.to_string().characters());
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if (value.is_string())
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putchar('"');
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printf("\033[0m");
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}
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static void print(JS::Value value)
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{
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HashTable<JS::Object*> seen_objects;
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print_value(value, seen_objects);
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putchar('\n');
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}
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void repl(JS::Interpreter& interpreter)
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{
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while (true) {
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@ -104,7 +173,7 @@ void repl(JS::Interpreter& interpreter)
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program->dump(0);
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auto result = interpreter.run(*program);
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printf("%s\n", result.to_string().characters());
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print(result);
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}
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}
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