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js: Implement some modest pretty-printing of values

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This commit is contained in:
Andreas Kling 2020-03-26 12:26:11 +01:00
parent 68dec2801d
commit 6e6495fdf9
1 changed files with 70 additions and 1 deletions
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71
Userland/js.cpp
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@ -32,6 +32,7 @@
#include <LibJS/AST.h> #include <LibJS/AST.h>
#include <LibJS/Interpreter.h> #include <LibJS/Interpreter.h>
#include <LibJS/Parser.h> #include <LibJS/Parser.h>
#include <LibJS/Runtime/Array.h>
#include <LibJS/Runtime/Object.h> #include <LibJS/Runtime/Object.h>
#include <LibJS/Runtime/PrimitiveString.h> #include <LibJS/Runtime/PrimitiveString.h>
#include <LibJS/Runtime/Value.h> #include <LibJS/Runtime/Value.h>
@ -92,6 +93,74 @@ String read_next_piece()
return piece.to_string(); return piece.to_string();
} }
static void print_value(JS::Value value, HashTable<JS::Object*>& seen_objects);
static void print_array(const JS::Array* array, HashTable<JS::Object*>& seen_objects)
{
fputs("[ ", stdout);
for (size_t i = 0; i < array->elements().size(); ++i) {
print_value(array->elements()[i], seen_objects);
if (i != array->elements().size() - 1)
fputs(", ", stdout);
}
fputs(" ]", stdout);
}
static void print_object(const JS::Object* object, HashTable<JS::Object*>& seen_objects)
{
fputs("{ ", stdout);
size_t index = 0;
for (auto& it : object->own_properties()) {
printf("\"\033[33;1m%s\033[0m\": ", it.key.characters());
print_value(it.value, seen_objects);
if (index != object->own_properties().size() - 1)
fputs(", ", stdout);
++index;
}
fputs(" }", stdout);
}
void print_value(JS::Value value, HashTable<JS::Object*>& seen_objects)
{
if (value.is_object()) {
if (seen_objects.contains(value.as_object())) {
// FIXME: Maybe we should only do this for circular references,
// not for all reoccurring objects.
printf("<already printed Object %p>", value.as_object());
return;
}
seen_objects.set(value.as_object());
}
if (value.is_array())
return print_array(static_cast<const JS::Array*>(value.as_object()), seen_objects);
if (value.is_object())
return print_object(value.as_object(), seen_objects);
if (value.is_string())
printf("\033[31;1m");
else if (value.is_number())
printf("\033[35;1m");
else if (value.is_boolean())
printf("\033[32;1m");
else if (value.is_null() || value.is_undefined())
printf("\033[34;1m");
if (value.is_string())
putchar('"');
printf("%s", value.to_string().characters());
if (value.is_string())
putchar('"');
printf("\033[0m");
}
static void print(JS::Value value)
{
HashTable<JS::Object*> seen_objects;
print_value(value, seen_objects);
putchar('\n');
}
void repl(JS::Interpreter& interpreter) void repl(JS::Interpreter& interpreter)
{ {
while (true) { while (true) {
@ -104,7 +173,7 @@ void repl(JS::Interpreter& interpreter)
program->dump(0); program->dump(0);
auto result = interpreter.run(*program); auto result = interpreter.run(*program);
printf("%s\n", result.to_string().characters()); print(result);
} }
} }