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godot/modules/gdscript/gdscript_tokenizer.cpp
Gio b6f1dbb340 Rewrite a bit of comment in tokenizer code 
gdscript_tokenizer.cpp: `change` -> `changes`
2023-09-19 21:38:52 +08:00

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/**************************************************************************/
/* gdscript_tokenizer.cpp */
/**************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/**************************************************************************/
#include "gdscript_tokenizer.h"
#include "core/error/error_macros.h"
#include "core/string/char_utils.h"
#ifdef DEBUG_ENABLED
#include "servers/text_server.h"
#endif
#ifdef TOOLS_ENABLED
#include "editor/editor_settings.h"
#endif
static const char *token_names[] = {
"Empty", // EMPTY,
// Basic
"Annotation", // ANNOTATION
"Identifier", // IDENTIFIER,
"Literal", // LITERAL,
// Comparison
"<", // LESS,
"<=", // LESS_EQUAL,
">", // GREATER,
">=", // GREATER_EQUAL,
"==", // EQUAL_EQUAL,
"!=", // BANG_EQUAL,
// Logical
"and", // AND,
"or", // OR,
"not", // NOT,
"&&", // AMPERSAND_AMPERSAND,
"||", // PIPE_PIPE,
"!", // BANG,
// Bitwise
"&", // AMPERSAND,
"|", // PIPE,
"~", // TILDE,
"^", // CARET,
"<<", // LESS_LESS,
">>", // GREATER_GREATER,
// Math
"+", // PLUS,
"-", // MINUS,
"*", // STAR,
"**", // STAR_STAR,
"/", // SLASH,
"%", // PERCENT,
// Assignment
"=", // EQUAL,
"+=", // PLUS_EQUAL,
"-=", // MINUS_EQUAL,
"*=", // STAR_EQUAL,
"**=", // STAR_STAR_EQUAL,
"/=", // SLASH_EQUAL,
"%=", // PERCENT_EQUAL,
"<<=", // LESS_LESS_EQUAL,
">>=", // GREATER_GREATER_EQUAL,
"&=", // AMPERSAND_EQUAL,
"|=", // PIPE_EQUAL,
"^=", // CARET_EQUAL,
// Control flow
"if", // IF,
"elif", // ELIF,
"else", // ELSE,
"for", // FOR,
"while", // WHILE,
"break", // BREAK,
"continue", // CONTINUE,
"pass", // PASS,
"return", // RETURN,
"match", // MATCH,
// Keywords
"as", // AS,
"assert", // ASSERT,
"await", // AWAIT,
"breakpoint", // BREAKPOINT,
"class", // CLASS,
"class_name", // CLASS_NAME,
"const", // CONST,
"enum", // ENUM,
"extends", // EXTENDS,
"func", // FUNC,
"in", // IN,
"is", // IS,
"namespace", // NAMESPACE
"preload", // PRELOAD,
"self", // SELF,
"signal", // SIGNAL,
"static", // STATIC,
"super", // SUPER,
"trait", // TRAIT,
"var", // VAR,
"void", // VOID,
"yield", // YIELD,
// Punctuation
"[", // BRACKET_OPEN,
"]", // BRACKET_CLOSE,
"{", // BRACE_OPEN,
"}", // BRACE_CLOSE,
"(", // PARENTHESIS_OPEN,
")", // PARENTHESIS_CLOSE,
",", // COMMA,
";", // SEMICOLON,
".", // PERIOD,
"..", // PERIOD_PERIOD,
":", // COLON,
"$", // DOLLAR,
"->", // FORWARD_ARROW,
"_", // UNDERSCORE,
// Whitespace
"Newline", // NEWLINE,
"Indent", // INDENT,
"Dedent", // DEDENT,
// Constants
"PI", // CONST_PI,
"TAU", // CONST_TAU,
"INF", // CONST_INF,
"NaN", // CONST_NAN,
// Error message improvement
"VCS conflict marker", // VCS_CONFLICT_MARKER,
"`", // BACKTICK,
"?", // QUESTION_MARK,
// Special
"Error", // ERROR,
"End of file", // EOF,
};
// Avoid desync.
static_assert(sizeof(token_names) / sizeof(token_names[0]) == GDScriptTokenizer::Token::TK_MAX, "Amount of token names don't match the amount of token types.");
const char *GDScriptTokenizer::Token::get_name() const {
ERR_FAIL_INDEX_V_MSG(type, TK_MAX, "<error>", "Using token type out of the enum.");
return token_names[type];
}
bool GDScriptTokenizer::Token::can_precede_bin_op() const {
switch (type) {
case IDENTIFIER:
case LITERAL:
case SELF:
case BRACKET_CLOSE:
case BRACE_CLOSE:
case PARENTHESIS_CLOSE:
case CONST_PI:
case CONST_TAU:
case CONST_INF:
case CONST_NAN:
return true;
default:
return false;
}
}
bool GDScriptTokenizer::Token::is_identifier() const {
// Note: Most keywords should not be recognized as identifiers.
// These are only exceptions for stuff that already is on the engine's API.
switch (type) {
case IDENTIFIER:
case MATCH: // Used in String.match().
// Allow constants to be treated as regular identifiers.
case CONST_PI:
case CONST_INF:
case CONST_NAN:
case CONST_TAU:
return true;
default:
return false;
}
}
bool GDScriptTokenizer::Token::is_node_name() const {
// This is meant to allow keywords with the $ notation, but not as general identifiers.
switch (type) {
case IDENTIFIER:
case AND:
case AS:
case ASSERT:
case AWAIT:
case BREAK:
case BREAKPOINT:
case CLASS_NAME:
case CLASS:
case CONST:
case CONST_PI:
case CONST_INF:
case CONST_NAN:
case CONST_TAU:
case CONTINUE:
case ELIF:
case ELSE:
case ENUM:
case EXTENDS:
case FOR:
case FUNC:
case IF:
case IN:
case IS:
case MATCH:
case NAMESPACE:
case NOT:
case OR:
case PASS:
case PRELOAD:
case RETURN:
case SELF:
case SIGNAL:
case STATIC:
case SUPER:
case TRAIT:
case UNDERSCORE:
case VAR:
case VOID:
case WHILE:
case YIELD:
return true;
default:
return false;
}
}
String GDScriptTokenizer::get_token_name(Token::Type p_token_type) {
ERR_FAIL_INDEX_V_MSG(p_token_type, Token::TK_MAX, "<error>", "Using token type out of the enum.");
return token_names[p_token_type];
}
void GDScriptTokenizer::set_source_code(const String &p_source_code) {
source = p_source_code;
if (source.is_empty()) {
_source = U"";
} else {
_source = source.ptr();
}
_current = _source;
line = 1;
column = 1;
length = p_source_code.length();
position = 0;
}
void GDScriptTokenizer::set_cursor_position(int p_line, int p_column) {
cursor_line = p_line;
cursor_column = p_column;
}
void GDScriptTokenizer::set_multiline_mode(bool p_state) {
multiline_mode = p_state;
}
void GDScriptTokenizer::push_expression_indented_block() {
indent_stack_stack.push_back(indent_stack);
}
void GDScriptTokenizer::pop_expression_indented_block() {
ERR_FAIL_COND(indent_stack_stack.size() == 0);
indent_stack = indent_stack_stack.back()->get();
indent_stack_stack.pop_back();
}
int GDScriptTokenizer::get_cursor_line() const {
return cursor_line;
}
int GDScriptTokenizer::get_cursor_column() const {
return cursor_column;
}
bool GDScriptTokenizer::is_past_cursor() const {
if (line < cursor_line) {
return false;
}
if (line > cursor_line) {
return true;
}
if (column < cursor_column) {
return false;
}
return true;
}
char32_t GDScriptTokenizer::_advance() {
if (unlikely(_is_at_end())) {
return '\0';
}
_current++;
column++;
position++;
if (column > rightmost_column) {
rightmost_column = column;
}
if (unlikely(_is_at_end())) {
// Add extra newline even if it's not there, to satisfy the parser.
newline(true);
// Also add needed unindent.
check_indent();
}
return _peek(-1);
}
void GDScriptTokenizer::push_paren(char32_t p_char) {
paren_stack.push_back(p_char);
}
bool GDScriptTokenizer::pop_paren(char32_t p_expected) {
if (paren_stack.is_empty()) {
return false;
}
char32_t actual = paren_stack.back()->get();
paren_stack.pop_back();
return actual == p_expected;
}
GDScriptTokenizer::Token GDScriptTokenizer::pop_error() {
Token error = error_stack.back()->get();
error_stack.pop_back();
return error;
}
GDScriptTokenizer::Token GDScriptTokenizer::make_token(Token::Type p_type) {
Token token(p_type);
token.start_line = start_line;
token.end_line = line;
token.start_column = start_column;
token.end_column = column;
token.leftmost_column = leftmost_column;
token.rightmost_column = rightmost_column;
token.source = String(_start, _current - _start);
if (p_type != Token::ERROR && cursor_line > -1) {
// Also count whitespace after token.
int offset = 0;
while (_peek(offset) == ' ' || _peek(offset) == '\t') {
offset++;
}
int last_column = column + offset;
// Check cursor position in token.
if (start_line == line) {
// Single line token.
if (cursor_line == start_line && cursor_column >= start_column && cursor_column <= last_column) {
token.cursor_position = cursor_column - start_column;
if (cursor_column == start_column) {
token.cursor_place = CURSOR_BEGINNING;
} else if (cursor_column < column) {
token.cursor_place = CURSOR_MIDDLE;
} else {
token.cursor_place = CURSOR_END;
}
}
} else {
// Multi line token.
if (cursor_line == start_line && cursor_column >= start_column) {
// Is in first line.
token.cursor_position = cursor_column - start_column;
if (cursor_column == start_column) {
token.cursor_place = CURSOR_BEGINNING;
} else {
token.cursor_place = CURSOR_MIDDLE;
}
} else if (cursor_line == line && cursor_column <= last_column) {
// Is in last line.
token.cursor_position = cursor_column - start_column;
if (cursor_column < column) {
token.cursor_place = CURSOR_MIDDLE;
} else {
token.cursor_place = CURSOR_END;
}
} else if (cursor_line > start_line && cursor_line < line) {
// Is in middle line.
token.cursor_position = CURSOR_MIDDLE;
}
}
}
last_token = token;
return token;
}
GDScriptTokenizer::Token GDScriptTokenizer::make_literal(const Variant &p_literal) {
Token token = make_token(Token::LITERAL);
token.literal = p_literal;
return token;
}
GDScriptTokenizer::Token GDScriptTokenizer::make_identifier(const StringName &p_identifier) {
Token identifier = make_token(Token::IDENTIFIER);
identifier.literal = p_identifier;
return identifier;
}
GDScriptTokenizer::Token GDScriptTokenizer::make_error(const String &p_message) {
Token error = make_token(Token::ERROR);
error.literal = p_message;
return error;
}
void GDScriptTokenizer::push_error(const String &p_message) {
Token error = make_error(p_message);
error_stack.push_back(error);
}
void GDScriptTokenizer::push_error(const Token &p_error) {
error_stack.push_back(p_error);
}
GDScriptTokenizer::Token GDScriptTokenizer::make_paren_error(char32_t p_paren) {
if (paren_stack.is_empty()) {
return make_error(vformat("Closing \"%c\" doesn't have an opening counterpart.", p_paren));
}
Token error = make_error(vformat("Closing \"%c\" doesn't match the opening \"%c\".", p_paren, paren_stack.back()->get()));
paren_stack.pop_back(); // Remove opening one anyway.
return error;
}
GDScriptTokenizer::Token GDScriptTokenizer::check_vcs_marker(char32_t p_test, Token::Type p_double_type) {
const char32_t *next = _current + 1;
int chars = 2; // Two already matched.
// Test before consuming characters, since we don't want to consume more than needed.
while (*next == p_test) {
chars++;
next++;
}
if (chars >= 7) {
// It is a VCS conflict marker.
while (chars > 1) {
// Consume all characters (first was already consumed by scan()).
_advance();
chars--;
}
return make_token(Token::VCS_CONFLICT_MARKER);
} else {
// It is only a regular double character token, so we consume the second character.
_advance();
return make_token(p_double_type);
}
}
GDScriptTokenizer::Token GDScriptTokenizer::annotation() {
if (is_unicode_identifier_start(_peek())) {
_advance(); // Consume start character.
} else {
push_error("Expected annotation identifier after \"@\".");
}
while (is_unicode_identifier_continue(_peek())) {
// Consume all identifier characters.
_advance();
}
Token annotation = make_token(Token::ANNOTATION);
annotation.literal = StringName(annotation.source);
return annotation;
}
#define KEYWORDS(KEYWORD_GROUP, KEYWORD) \
KEYWORD_GROUP('a') \
KEYWORD("as", Token::AS) \
KEYWORD("and", Token::AND) \
KEYWORD("assert", Token::ASSERT) \
KEYWORD("await", Token::AWAIT) \
KEYWORD_GROUP('b') \
KEYWORD("break", Token::BREAK) \
KEYWORD("breakpoint", Token::BREAKPOINT) \
KEYWORD_GROUP('c') \
KEYWORD("class", Token::CLASS) \
KEYWORD("class_name", Token::CLASS_NAME) \
KEYWORD("const", Token::CONST) \
KEYWORD("continue", Token::CONTINUE) \
KEYWORD_GROUP('e') \
KEYWORD("elif", Token::ELIF) \
KEYWORD("else", Token::ELSE) \
KEYWORD("enum", Token::ENUM) \
KEYWORD("extends", Token::EXTENDS) \
KEYWORD_GROUP('f') \
KEYWORD("for", Token::FOR) \
KEYWORD("func", Token::FUNC) \
KEYWORD_GROUP('i') \
KEYWORD("if", Token::IF) \
KEYWORD("in", Token::IN) \
KEYWORD("is", Token::IS) \
KEYWORD_GROUP('m') \
KEYWORD("match", Token::MATCH) \
KEYWORD_GROUP('n') \
KEYWORD("namespace", Token::NAMESPACE) \
KEYWORD("not", Token::NOT) \
KEYWORD_GROUP('o') \
KEYWORD("or", Token::OR) \
KEYWORD_GROUP('p') \
KEYWORD("pass", Token::PASS) \
KEYWORD("preload", Token::PRELOAD) \
KEYWORD_GROUP('r') \
KEYWORD("return", Token::RETURN) \
KEYWORD_GROUP('s') \
KEYWORD("self", Token::SELF) \
KEYWORD("signal", Token::SIGNAL) \
KEYWORD("static", Token::STATIC) \
KEYWORD("super", Token::SUPER) \
KEYWORD_GROUP('t') \
KEYWORD("trait", Token::TRAIT) \
KEYWORD_GROUP('v') \
KEYWORD("var", Token::VAR) \
KEYWORD("void", Token::VOID) \
KEYWORD_GROUP('w') \
KEYWORD("while", Token::WHILE) \
KEYWORD_GROUP('y') \
KEYWORD("yield", Token::YIELD) \
KEYWORD_GROUP('I') \
KEYWORD("INF", Token::CONST_INF) \
KEYWORD_GROUP('N') \
KEYWORD("NAN", Token::CONST_NAN) \
KEYWORD_GROUP('P') \
KEYWORD("PI", Token::CONST_PI) \
KEYWORD_GROUP('T') \
KEYWORD("TAU", Token::CONST_TAU)
#define MIN_KEYWORD_LENGTH 2
#define MAX_KEYWORD_LENGTH 10
#ifdef DEBUG_ENABLED
void GDScriptTokenizer::make_keyword_list() {
#define KEYWORD_LINE(keyword, token_type) keyword,
#define KEYWORD_GROUP_IGNORE(group)
keyword_list = {
KEYWORDS(KEYWORD_GROUP_IGNORE, KEYWORD_LINE)
};
#undef KEYWORD_LINE
#undef KEYWORD_GROUP_IGNORE
}
#endif // DEBUG_ENABLED
GDScriptTokenizer::Token GDScriptTokenizer::potential_identifier() {
bool only_ascii = _peek(-1) < 128;
// Consume all identifier characters.
while (is_unicode_identifier_continue(_peek())) {
char32_t c = _advance();
only_ascii = only_ascii && c < 128;
}
int len = _current - _start;
if (len == 1 && _peek(-1) == '_') {
// Lone underscore.
return make_token(Token::UNDERSCORE);
}
String name(_start, len);
if (len < MIN_KEYWORD_LENGTH || len > MAX_KEYWORD_LENGTH) {
// Cannot be a keyword, as the length doesn't match any.
return make_identifier(name);
}
if (!only_ascii) {
// Kept here in case the order with push_error matters.
Token id = make_identifier(name);
#ifdef DEBUG_ENABLED
// Additional checks for identifiers but only in debug and if it's available in TextServer.
if (TS->has_feature(TextServer::FEATURE_UNICODE_SECURITY)) {
int64_t confusable = TS->is_confusable(name, keyword_list);
if (confusable >= 0) {
push_error(vformat(R"(Identifier "%s" is visually similar to the GDScript keyword "%s" and thus not allowed.)", name, keyword_list[confusable]));
}
}
#endif // DEBUG_ENABLED
// Cannot be a keyword, as keywords are ASCII only.
return id;
}
// Define some helper macros for the switch case.
#define KEYWORD_GROUP_CASE(char) \
break; \
case char:
#define KEYWORD(keyword, token_type) \
{ \
const int keyword_length = sizeof(keyword) - 1; \
static_assert(keyword_length <= MAX_KEYWORD_LENGTH, "There's a keyword longer than the defined maximum length"); \
static_assert(keyword_length >= MIN_KEYWORD_LENGTH, "There's a keyword shorter than the defined minimum length"); \
if (keyword_length == len && name == keyword) { \
return make_token(token_type); \
} \
}
// Find if it's a keyword.
switch (_start[0]) {
default:
KEYWORDS(KEYWORD_GROUP_CASE, KEYWORD)
break;
}
// Check if it's a special literal
if (len == 4) {
if (name == "true") {
return make_literal(true);
} else if (name == "null") {
return make_literal(Variant());
}
} else if (len == 5) {
if (name == "false") {
return make_literal(false);
}
}
// Not a keyword, so must be an identifier.
return make_identifier(name);
#undef KEYWORD_GROUP_CASE
#undef KEYWORD
}
#undef MAX_KEYWORD_LENGTH
#undef MIN_KEYWORD_LENGTH
#undef KEYWORDS
void GDScriptTokenizer::newline(bool p_make_token) {
// Don't overwrite previous newline, nor create if we want a line continuation.
if (p_make_token && !pending_newline && !line_continuation) {
Token newline(Token::NEWLINE);
newline.start_line = line;
newline.end_line = line;
newline.start_column = column - 1;
newline.end_column = column;
newline.leftmost_column = newline.start_column;
newline.rightmost_column = newline.end_column;
pending_newline = true;
last_token = newline;
last_newline = newline;
}
// Increment line/column counters.
line++;
column = 1;
leftmost_column = 1;
}
GDScriptTokenizer::Token GDScriptTokenizer::number() {
int base = 10;
bool has_decimal = false;
bool has_exponent = false;
bool has_error = false;
bool (*digit_check_func)(char32_t) = is_digit;
// Sign before hexadecimal or binary.
if ((_peek(-1) == '+' || _peek(-1) == '-') && _peek() == '0') {
_advance();
}
if (_peek(-1) == '.') {
has_decimal = true;
} else if (_peek(-1) == '0') {
if (_peek() == 'x') {
// Hexadecimal.
base = 16;
digit_check_func = is_hex_digit;
_advance();
} else if (_peek() == 'b') {
// Binary.
base = 2;
digit_check_func = is_binary_digit;
_advance();
}
}
if (base != 10 && is_underscore(_peek())) { // Disallow `0x_` and `0b_`.
Token error = make_error(vformat(R"(Unexpected underscore after "0%c".)", _peek(-1)));
error.start_column = column;
error.leftmost_column = column;
error.end_column = column + 1;
error.rightmost_column = column + 1;
push_error(error);
has_error = true;
}
bool previous_was_underscore = false; // Allow `_` to be used in a number, for readability.
while (digit_check_func(_peek()) || is_underscore(_peek())) {
if (is_underscore(_peek())) {
if (previous_was_underscore) {
Token error = make_error(R"(Multiple underscores cannot be adjacent in a numeric literal.)");
error.start_column = column;
error.leftmost_column = column;
error.end_column = column + 1;
error.rightmost_column = column + 1;
push_error(error);
}
previous_was_underscore = true;
} else {
previous_was_underscore = false;
}
_advance();
}
// It might be a ".." token (instead of decimal point) so we check if it's not.
if (_peek() == '.' && _peek(1) != '.') {
if (base == 10 && !has_decimal) {
has_decimal = true;
} else if (base == 10) {
Token error = make_error("Cannot use a decimal point twice in a number.");
error.start_column = column;
error.leftmost_column = column;
error.end_column = column + 1;
error.rightmost_column = column + 1;
push_error(error);
has_error = true;
} else if (base == 16) {
Token error = make_error("Cannot use a decimal point in a hexadecimal number.");
error.start_column = column;
error.leftmost_column = column;
error.end_column = column + 1;
error.rightmost_column = column + 1;
push_error(error);
has_error = true;
} else {
Token error = make_error("Cannot use a decimal point in a binary number.");
error.start_column = column;
error.leftmost_column = column;
error.end_column = column + 1;
error.rightmost_column = column + 1;
push_error(error);
has_error = true;
}
if (!has_error) {
_advance();
// Consume decimal digits.
if (is_underscore(_peek())) { // Disallow `10._`, but allow `10.`.
Token error = make_error(R"(Unexpected underscore after decimal point.)");
error.start_column = column;
error.leftmost_column = column;
error.end_column = column + 1;
error.rightmost_column = column + 1;
push_error(error);
has_error = true;
}
previous_was_underscore = false;
while (is_digit(_peek()) || is_underscore(_peek())) {
if (is_underscore(_peek())) {
if (previous_was_underscore) {
Token error = make_error(R"(Multiple underscores cannot be adjacent in a numeric literal.)");
error.start_column = column;
error.leftmost_column = column;
error.end_column = column + 1;
error.rightmost_column = column + 1;
push_error(error);
}
previous_was_underscore = true;
} else {
previous_was_underscore = false;
}
_advance();
}
}
}
if (base == 10) {
if (_peek() == 'e' || _peek() == 'E') {
has_exponent = true;
_advance();
if (_peek() == '+' || _peek() == '-') {
// Exponent sign.
_advance();
}
// Consume exponent digits.
if (!is_digit(_peek())) {
Token error = make_error(R"(Expected exponent value after "e".)");
error.start_column = column;
error.leftmost_column = column;
error.end_column = column + 1;
error.rightmost_column = column + 1;
push_error(error);
}
previous_was_underscore = false;
while (is_digit(_peek()) || is_underscore(_peek())) {
if (is_underscore(_peek())) {
if (previous_was_underscore) {
Token error = make_error(R"(Multiple underscores cannot be adjacent in a numeric literal.)");
error.start_column = column;
error.leftmost_column = column;
error.end_column = column + 1;
error.rightmost_column = column + 1;
push_error(error);
}
previous_was_underscore = true;
} else {
previous_was_underscore = false;
}
_advance();
}
}
}
// Detect extra decimal point.
if (!has_error && has_decimal && _peek() == '.' && _peek(1) != '.') {
Token error = make_error("Cannot use a decimal point twice in a number.");
error.start_column = column;
error.leftmost_column = column;
error.end_column = column + 1;
error.rightmost_column = column + 1;
push_error(error);
has_error = true;
} else if (is_unicode_identifier_start(_peek()) || is_unicode_identifier_continue(_peek())) {
// Letter at the end of the number.
push_error("Invalid numeric notation.");
}
// Create a string with the whole number.
int len = _current - _start;
String number = String(_start, len).replace("_", "");
// Convert to the appropriate literal type.
if (base == 16) {
int64_t value = number.hex_to_int();
return make_literal(value);
} else if (base == 2) {
int64_t value = number.bin_to_int();
return make_literal(value);
} else if (has_decimal || has_exponent) {
double value = number.to_float();
return make_literal(value);
} else {
int64_t value = number.to_int();
return make_literal(value);
}
}
GDScriptTokenizer::Token GDScriptTokenizer::string() {
enum StringType {
STRING_REGULAR,
STRING_NAME,
STRING_NODEPATH,
};
bool is_multiline = false;
StringType type = STRING_REGULAR;
if (_peek(-1) == '&') {
type = STRING_NAME;
_advance();
} else if (_peek(-1) == '^') {
type = STRING_NODEPATH;
_advance();
}
char32_t quote_char = _peek(-1);
if (_peek() == quote_char && _peek(1) == quote_char) {
is_multiline = true;
// Consume all quotes.
_advance();
_advance();
}
String result;
char32_t prev = 0;
int prev_pos = 0;
for (;;) {
// Consume actual string.
if (_is_at_end()) {
return make_error("Unterminated string.");
}
char32_t ch = _peek();
if (ch == 0x200E || ch == 0x200F || (ch >= 0x202A && ch <= 0x202E) || (ch >= 0x2066 && ch <= 0x2069)) {
Token error = make_error("Invisible text direction control character present in the string, escape it (\"\\u" + String::num_int64(ch, 16) + "\") to avoid confusion.");
error.start_column = column;
error.leftmost_column = error.start_column;
error.end_column = column + 1;
error.rightmost_column = error.end_column;
push_error(error);
}
if (ch == '\\') {
// Escape pattern.
_advance();
if (_is_at_end()) {
return make_error("Unterminated string.");
}
// Grab escape character.
char32_t code = _peek();
_advance();
if (_is_at_end()) {
return make_error("Unterminated string.");
}
char32_t escaped = 0;
bool valid_escape = true;
switch (code) {
case 'a':
escaped = '\a';
break;
case 'b':
escaped = '\b';
break;
case 'f':
escaped = '\f';
break;
case 'n':
escaped = '\n';
break;
case 'r':
escaped = '\r';
break;
case 't':
escaped = '\t';
break;
case 'v':
escaped = '\v';
break;
case '\'':
escaped = '\'';
break;
case '\"':
escaped = '\"';
break;
case '\\':
escaped = '\\';
break;
case 'U':
case 'u': {
// Hexadecimal sequence.
int hex_len = (code == 'U') ? 6 : 4;
for (int j = 0; j < hex_len; j++) {
if (_is_at_end()) {
return make_error("Unterminated string.");
}
char32_t digit = _peek();
char32_t value = 0;
if (is_digit(digit)) {
value = digit - '0';
} else if (digit >= 'a' && digit <= 'f') {
value = digit - 'a';
value += 10;
} else if (digit >= 'A' && digit <= 'F') {
value = digit - 'A';
value += 10;
} else {
// Make error, but keep parsing the string.
Token error = make_error("Invalid hexadecimal digit in unicode escape sequence.");
error.start_column = column;
error.leftmost_column = error.start_column;
error.end_column = column + 1;
error.rightmost_column = error.end_column;
push_error(error);
valid_escape = false;
break;
}
escaped <<= 4;
escaped |= value;
_advance();
}
} break;
case '\r':
if (_peek() != '\n') {
// Carriage return without newline in string. (???)
// Just add it to the string and keep going.
result += ch;
_advance();
break;
}
[[fallthrough]];
case '\n':
// Escaping newline.
newline(false);
valid_escape = false; // Don't add to the string.
break;
default:
Token error = make_error("Invalid escape in string.");
error.start_column = column - 2;
error.leftmost_column = error.start_column;
push_error(error);
valid_escape = false;
break;
}
// Parse UTF-16 pair.
if (valid_escape) {
if ((escaped & 0xfffffc00) == 0xd800) {
if (prev == 0) {
prev = escaped;
prev_pos = column - 2;
continue;
} else {
Token error = make_error("Invalid UTF-16 sequence in string, unpaired lead surrogate");
error.start_column = column - 2;
error.leftmost_column = error.start_column;
push_error(error);
valid_escape = false;
prev = 0;
}
} else if ((escaped & 0xfffffc00) == 0xdc00) {
if (prev == 0) {
Token error = make_error("Invalid UTF-16 sequence in string, unpaired trail surrogate");
error.start_column = column - 2;
error.leftmost_column = error.start_column;
push_error(error);
valid_escape = false;
} else {
escaped = (prev << 10UL) + escaped - ((0xd800 << 10UL) + 0xdc00 - 0x10000);
prev = 0;
}
}
if (prev != 0) {
Token error = make_error("Invalid UTF-16 sequence in string, unpaired lead surrogate");
error.start_column = prev_pos;
error.leftmost_column = error.start_column;
push_error(error);
prev = 0;
}
}
if (valid_escape) {
result += escaped;
}
} else if (ch == quote_char) {
if (prev != 0) {
Token error = make_error("Invalid UTF-16 sequence in string, unpaired lead surrogate");
error.start_column = prev_pos;
error.leftmost_column = error.start_column;
push_error(error);
prev = 0;
}
_advance();
if (is_multiline) {
if (_peek() == quote_char && _peek(1) == quote_char) {
// Ended the multiline string. Consume all quotes.
_advance();
_advance();
break;
} else {
// Not a multiline string termination, add consumed quote.
result += quote_char;
}
} else {
// Ended single-line string.
break;
}
} else {
if (prev != 0) {
Token error = make_error("Invalid UTF-16 sequence in string, unpaired lead surrogate");
error.start_column = prev_pos;
error.leftmost_column = error.start_column;
push_error(error);
prev = 0;
}
result += ch;
_advance();
if (ch == '\n') {
newline(false);
}
}
}
if (prev != 0) {
Token error = make_error("Invalid UTF-16 sequence in string, unpaired lead surrogate");
error.start_column = prev_pos;
error.leftmost_column = error.start_column;
push_error(error);
prev = 0;
}
// Make the literal.
Variant string;
switch (type) {
case STRING_NAME:
string = StringName(result);
break;
case STRING_NODEPATH:
string = NodePath(result);
break;
case STRING_REGULAR:
string = result;
break;
}
return make_literal(string);
}
void GDScriptTokenizer::check_indent() {
ERR_FAIL_COND_MSG(column != 1, "Checking tokenizer indentation in the middle of a line.");
if (_is_at_end()) {
// Send dedents for every indent level.
pending_indents -= indent_level();
indent_stack.clear();
return;
}
for (;;) {
char32_t current_indent_char = _peek();
int indent_count = 0;
if (current_indent_char != ' ' && current_indent_char != '\t' && current_indent_char != '\r' && current_indent_char != '\n' && current_indent_char != '#') {
// First character of the line is not whitespace, so we clear all indentation levels.
// Unless we are in a continuation or in multiline mode (inside expression).
if (line_continuation || multiline_mode) {
return;
}
pending_indents -= indent_level();
indent_stack.clear();
return;
}
if (_peek() == '\r') {
_advance();
if (_peek() != '\n') {
push_error("Stray carriage return character in source code.");
}
}
if (_peek() == '\n') {
// Empty line, keep going.
_advance();
newline(false);
continue;
}
// Check indent level.
bool mixed = false;
while (!_is_at_end()) {
char32_t space = _peek();
if (space == '\t') {
// Consider individual tab columns.
column += tab_size - 1;
indent_count += tab_size;
} else if (space == ' ') {
indent_count += 1;
} else {
break;
}
mixed = mixed || space != current_indent_char;
_advance();
}
if (_is_at_end()) {
// Reached the end with an empty line, so just dedent as much as needed.
pending_indents -= indent_level();
indent_stack.clear();
return;
}
if (_peek() == '\r') {
_advance();
if (_peek() != '\n') {
push_error("Stray carriage return character in source code.");
}
}
if (_peek() == '\n') {
// Empty line, keep going.
_advance();
newline(false);
continue;
}
if (_peek() == '#') {
// Comment. Advance to the next line.
#ifdef TOOLS_ENABLED
String comment;
while (_peek() != '\n' && !_is_at_end()) {
comment += _advance();
}
comments[line] = CommentData(comment, true);
#else
while (_peek() != '\n' && !_is_at_end()) {
_advance();
}
#endif // TOOLS_ENABLED
if (_is_at_end()) {
// Reached the end with an empty line, so just dedent as much as needed.
pending_indents -= indent_level();
indent_stack.clear();
return;
}
_advance(); // Consume '\n'.
newline(false);
continue;
}
if (mixed && !line_continuation && !multiline_mode) {
Token error = make_error("Mixed use of tabs and spaces for indentation.");
error.start_line = line;
error.start_column = 1;
error.leftmost_column = 1;
error.rightmost_column = column;
push_error(error);
}
if (line_continuation || multiline_mode) {
// We cleared up all the whitespace at the beginning of the line.
// If this is a line continuation or we're in multiline mode then we don't want any indentation changes.
return;
}
// Check if indentation character is consistent.
if (indent_char == '\0') {
// First time indenting, choose character now.
indent_char = current_indent_char;
} else if (current_indent_char != indent_char) {
Token error = make_error(vformat("Used %s character for indentation instead of %s as used before in the file.",
_get_indent_char_name(current_indent_char), _get_indent_char_name(indent_char)));
error.start_line = line;
error.start_column = 1;
error.leftmost_column = 1;
error.rightmost_column = column;
push_error(error);
}
// Now we can do actual indentation changes.
// Check if indent or dedent.
int previous_indent = 0;
if (indent_level() > 0) {
previous_indent = indent_stack.back()->get();
}
if (indent_count == previous_indent) {
// No change in indentation.
return;
}
if (indent_count > previous_indent) {
// Indentation increased.
indent_stack.push_back(indent_count);
pending_indents++;
} else {
// Indentation decreased (dedent).
if (indent_level() == 0) {
push_error("Tokenizer bug: trying to dedent without previous indent.");
return;
}
while (indent_level() > 0 && indent_stack.back()->get() > indent_count) {
indent_stack.pop_back();
pending_indents--;
}
if ((indent_level() > 0 && indent_stack.back()->get() != indent_count) || (indent_level() == 0 && indent_count != 0)) {
// Mismatched indentation alignment.
Token error = make_error("Unindent doesn't match the previous indentation level.");
error.start_line = line;
error.start_column = 1;
error.leftmost_column = 1;
error.end_column = column + 1;
error.rightmost_column = column + 1;
push_error(error);
// Still, we'll be lenient and keep going, so keep this level in the stack.
indent_stack.push_back(indent_count);
}
}
break; // Get out of the loop in any case.
}
}
String GDScriptTokenizer::_get_indent_char_name(char32_t ch) {
ERR_FAIL_COND_V(ch != ' ' && ch != '\t', String(&ch, 1).c_escape());
return ch == ' ' ? "space" : "tab";
}
void GDScriptTokenizer::_skip_whitespace() {
if (pending_indents != 0) {
// Still have some indent/dedent tokens to give.
return;
}
bool is_bol = column == 1; // Beginning of line.
if (is_bol) {
check_indent();
return;
}
for (;;) {
char32_t c = _peek();
switch (c) {
case ' ':
_advance();
break;
case '\t':
_advance();
// Consider individual tab columns.
column += tab_size - 1;
break;
case '\r':
_advance(); // Consume either way.
if (_peek() != '\n') {
push_error("Stray carriage return character in source code.");
return;
}
break;
case '\n':
_advance();
newline(!is_bol); // Don't create new line token if line is empty.
check_indent();
break;
case '#': {
// Comment.
#ifdef TOOLS_ENABLED
String comment;
while (_peek() != '\n' && !_is_at_end()) {
comment += _advance();
}
comments[line] = CommentData(comment, is_bol);
#else
while (_peek() != '\n' && !_is_at_end()) {
_advance();
}
#endif // TOOLS_ENABLED
if (_is_at_end()) {
return;
}
_advance(); // Consume '\n'
newline(!is_bol);
check_indent();
} break;
default:
return;
}
}
}
GDScriptTokenizer::Token GDScriptTokenizer::scan() {
if (has_error()) {
return pop_error();
}
_skip_whitespace();
if (pending_newline) {
pending_newline = false;
if (!multiline_mode) {
// Don't return newline tokens on multiline mode.
return last_newline;
}
}
// Check for potential errors after skipping whitespace().
if (has_error()) {
return pop_error();
}
_start = _current;
start_line = line;
start_column = column;
leftmost_column = column;
rightmost_column = column;
if (pending_indents != 0) {
// Adjust position for indent.
_start -= start_column - 1;
start_column = 1;
leftmost_column = 1;
if (pending_indents > 0) {
// Indents.
pending_indents--;
return make_token(Token::INDENT);
} else {
// Dedents.
pending_indents++;
Token dedent = make_token(Token::DEDENT);
dedent.end_column += 1;
dedent.rightmost_column += 1;
return dedent;
}
}
if (_is_at_end()) {
return make_token(Token::TK_EOF);
}
const char32_t c = _advance();
if (c == '\\') {
// Line continuation with backslash.
if (_peek() == '\r') {
if (_peek(1) != '\n') {
return make_error("Unexpected carriage return character.");
}
_advance();
}
if (_peek() != '\n') {
return make_error("Expected new line after \"\\\".");
}
_advance();
newline(false);
line_continuation = true;
return scan(); // Recurse to get next token.
}
line_continuation = false;
if (is_digit(c)) {
return number();
} else if (is_unicode_identifier_start(c)) {
return potential_identifier();
}
switch (c) {
// String literals.
case '"':
case '\'':
return string();
// Annotation.
case '@':
return annotation();
// Single characters.
case '~':
return make_token(Token::TILDE);
case ',':
return make_token(Token::COMMA);
case ':':
return make_token(Token::COLON);
case ';':
return make_token(Token::SEMICOLON);
case '$':
return make_token(Token::DOLLAR);
case '?':
return make_token(Token::QUESTION_MARK);
case '`':
return make_token(Token::BACKTICK);
// Parens.
case '(':
push_paren('(');
return make_token(Token::PARENTHESIS_OPEN);
case '[':
push_paren('[');
return make_token(Token::BRACKET_OPEN);
case '{':
push_paren('{');
return make_token(Token::BRACE_OPEN);
case ')':
if (!pop_paren('(')) {
return make_paren_error(c);
}
return make_token(Token::PARENTHESIS_CLOSE);
case ']':
if (!pop_paren('[')) {
return make_paren_error(c);
}
return make_token(Token::BRACKET_CLOSE);
case '}':
if (!pop_paren('{')) {
return make_paren_error(c);
}
return make_token(Token::BRACE_CLOSE);
// Double characters.
case '!':
if (_peek() == '=') {
_advance();
return make_token(Token::BANG_EQUAL);
} else {
return make_token(Token::BANG);
}
case '.':
if (_peek() == '.') {
_advance();
return make_token(Token::PERIOD_PERIOD);
} else if (is_digit(_peek())) {
// Number starting with '.'.
return number();
} else {
return make_token(Token::PERIOD);
}
case '+':
if (_peek() == '=') {
_advance();
return make_token(Token::PLUS_EQUAL);
} else if (is_digit(_peek()) && !last_token.can_precede_bin_op()) {
// Number starting with '+'.
return number();
} else {
return make_token(Token::PLUS);
}
case '-':
if (_peek() == '=') {
_advance();
return make_token(Token::MINUS_EQUAL);
} else if (is_digit(_peek()) && !last_token.can_precede_bin_op()) {
// Number starting with '-'.
return number();
} else if (_peek() == '>') {
_advance();
return make_token(Token::FORWARD_ARROW);
} else {
return make_token(Token::MINUS);
}
case '*':
if (_peek() == '=') {
_advance();
return make_token(Token::STAR_EQUAL);
} else if (_peek() == '*') {
if (_peek(1) == '=') {
_advance();
_advance(); // Advance both '*' and '='
return make_token(Token::STAR_STAR_EQUAL);
}
_advance();
return make_token(Token::STAR_STAR);
} else {
return make_token(Token::STAR);
}
case '/':
if (_peek() == '=') {
_advance();
return make_token(Token::SLASH_EQUAL);
} else {
return make_token(Token::SLASH);
}
case '%':
if (_peek() == '=') {
_advance();
return make_token(Token::PERCENT_EQUAL);
} else {
return make_token(Token::PERCENT);
}
case '^':
if (_peek() == '=') {
_advance();
return make_token(Token::CARET_EQUAL);
} else if (_peek() == '"' || _peek() == '\'') {
// Node path
return string();
} else {
return make_token(Token::CARET);
}
case '&':
if (_peek() == '&') {
_advance();
return make_token(Token::AMPERSAND_AMPERSAND);
} else if (_peek() == '=') {
_advance();
return make_token(Token::AMPERSAND_EQUAL);
} else if (_peek() == '"' || _peek() == '\'') {
// String Name
return string();
} else {
return make_token(Token::AMPERSAND);
}
case '|':
if (_peek() == '|') {
_advance();
return make_token(Token::PIPE_PIPE);
} else if (_peek() == '=') {
_advance();
return make_token(Token::PIPE_EQUAL);
} else {
return make_token(Token::PIPE);
}
// Potential VCS conflict markers.
case '=':
if (_peek() == '=') {
return check_vcs_marker('=', Token::EQUAL_EQUAL);
} else {
return make_token(Token::EQUAL);
}
case '<':
if (_peek() == '=') {
_advance();
return make_token(Token::LESS_EQUAL);
} else if (_peek() == '<') {
if (_peek(1) == '=') {
_advance();
_advance(); // Advance both '<' and '='
return make_token(Token::LESS_LESS_EQUAL);
} else {
return check_vcs_marker('<', Token::LESS_LESS);
}
} else {
return make_token(Token::LESS);
}
case '>':
if (_peek() == '=') {
_advance();
return make_token(Token::GREATER_EQUAL);
} else if (_peek() == '>') {
if (_peek(1) == '=') {
_advance();
_advance(); // Advance both '>' and '='
return make_token(Token::GREATER_GREATER_EQUAL);
} else {
return check_vcs_marker('>', Token::GREATER_GREATER);
}
} else {
return make_token(Token::GREATER);
}
default:
if (is_whitespace(c)) {
return make_error(vformat(R"(Invalid white space character U+%04X.)", static_cast<int32_t>(c)));
} else {
return make_error(vformat(R"(Invalid character "%c" (U+%04X).)", c, static_cast<int32_t>(c)));
}
}
}
GDScriptTokenizer::GDScriptTokenizer() {
#ifdef TOOLS_ENABLED
if (EditorSettings::get_singleton()) {
tab_size = EditorSettings::get_singleton()->get_setting("text_editor/behavior/indent/size");
}
#endif // TOOLS_ENABLED
#ifdef DEBUG_ENABLED
make_keyword_list();
#endif // DEBUG_ENABLED
}
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