1430 lines
37 KiB
C++
1430 lines
37 KiB
C++
/*************************************************************************/
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/* gdscript_tokenizer.cpp */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md). */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#include "gdscript_tokenizer.h"
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#include "core/error/error_macros.h"
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#ifdef TOOLS_ENABLED
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#include "editor/editor_settings.h"
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#endif
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static const char *token_names[] = {
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"Empty", // EMPTY,
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// Basic
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"Annotation", // ANNOTATION
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"Identifier", // IDENTIFIER,
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"Literal", // LITERAL,
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// Comparison
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"<", // LESS,
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"<=", // LESS_EQUAL,
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">", // GREATER,
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">=", // GREATER_EQUAL,
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"==", // EQUAL_EQUAL,
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"!=", // BANG_EQUAL,
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// Logical
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"and", // AND,
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"or", // OR,
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"not", // NOT,
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"&&", // AMPERSAND_AMPERSAND,
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"||", // PIPE_PIPE,
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"!", // BANG,
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// Bitwise
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"&", // AMPERSAND,
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"|", // PIPE,
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"~", // TILDE,
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"^", // CARET,
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"<<", // LESS_LESS,
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">>", // GREATER_GREATER,
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// Math
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"+", // PLUS,
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"-", // MINUS,
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"*", // STAR,
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"/", // SLASH,
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"%", // PERCENT,
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// Assignment
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"=", // EQUAL,
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"+=", // PLUS_EQUAL,
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"-=", // MINUS_EQUAL,
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"*=", // STAR_EQUAL,
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"/=", // SLASH_EQUAL,
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"%=", // PERCENT_EQUAL,
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"<<=", // LESS_LESS_EQUAL,
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">>=", // GREATER_GREATER_EQUAL,
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"&=", // AMPERSAND_EQUAL,
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"|=", // PIPE_EQUAL,
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"^=", // CARET_EQUAL,
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// Control flow
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"if", // IF,
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"elif", // ELIF,
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"else", // ELSE,
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"for", // FOR,
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"while", // WHILE,
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"break", // BREAK,
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"continue", // CONTINUE,
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"pass", // PASS,
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"return", // RETURN,
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"match", // MATCH,
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// Keywords
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"as", // AS,
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"assert", // ASSERT,
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"await", // AWAIT,
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"breakpoint", // BREAKPOINT,
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"class", // CLASS,
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"class_name", // CLASS_NAME,
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"const", // CONST,
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"enum", // ENUM,
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"extends", // EXTENDS,
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"func", // FUNC,
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"in", // IN,
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"is", // IS,
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"namespace", // NAMESPACE
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"preload", // PRELOAD,
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"self", // SELF,
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"signal", // SIGNAL,
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"static", // STATIC,
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"super", // SUPER,
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"trait", // TRAIT,
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"var", // VAR,
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"void", // VOID,
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"yield", // YIELD,
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// Punctuation
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"[", // BRACKET_OPEN,
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"]", // BRACKET_CLOSE,
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"{", // BRACE_OPEN,
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"}", // BRACE_CLOSE,
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"(", // PARENTHESIS_OPEN,
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")", // PARENTHESIS_CLOSE,
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",", // COMMA,
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";", // SEMICOLON,
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".", // PERIOD,
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"..", // PERIOD_PERIOD,
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":", // COLON,
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"$", // DOLLAR,
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"->", // FORWARD_ARROW,
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"_", // UNDERSCORE,
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// Whitespace
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"Newline", // NEWLINE,
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"Indent", // INDENT,
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"Dedent", // DEDENT,
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// Constants
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"PI", // CONST_PI,
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"TAU", // CONST_TAU,
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"INF", // CONST_INF,
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"NaN", // CONST_NAN,
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// Error message improvement
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"VCS conflict marker", // VCS_CONFLICT_MARKER,
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"`", // BACKTICK,
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"?", // QUESTION_MARK,
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// Special
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"Error", // ERROR,
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"End of file", // EOF,
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};
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// Avoid desync.
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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.");
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const char *GDScriptTokenizer::Token::get_name() const {
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ERR_FAIL_INDEX_V_MSG(type, TK_MAX, "<error>", "Using token type out of the enum.");
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return token_names[type];
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}
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bool GDScriptTokenizer::Token::is_identifier() const {
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// Note: Most keywords should not be recognized as identifiers.
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// These are only exceptions for stuff that already is on the engine's API.
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switch (type) {
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case IDENTIFIER:
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case MATCH: // Used in String.match().
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return true;
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default:
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return false;
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}
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}
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bool GDScriptTokenizer::Token::is_node_name() const {
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// This is meant to allow keywords with the $ notation, but not as general identifiers.
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switch (type) {
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case IDENTIFIER:
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case AND:
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case AS:
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case ASSERT:
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case AWAIT:
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case BREAK:
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case BREAKPOINT:
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case CLASS_NAME:
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case CLASS:
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case CONST:
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case CONTINUE:
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case ELIF:
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case ELSE:
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case ENUM:
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case EXTENDS:
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case FOR:
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case FUNC:
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case IF:
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case IN:
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case IS:
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case MATCH:
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case NAMESPACE:
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case NOT:
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case OR:
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case PASS:
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case PRELOAD:
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case RETURN:
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case SELF:
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case SIGNAL:
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case STATIC:
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case SUPER:
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case TRAIT:
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case UNDERSCORE:
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case VAR:
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case VOID:
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case WHILE:
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case YIELD:
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return true;
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default:
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return false;
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}
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}
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String GDScriptTokenizer::get_token_name(Token::Type p_token_type) {
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ERR_FAIL_INDEX_V_MSG(p_token_type, Token::TK_MAX, "<error>", "Using token type out of the enum.");
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return token_names[p_token_type];
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}
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void GDScriptTokenizer::set_source_code(const String &p_source_code) {
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source = p_source_code;
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if (source.is_empty()) {
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_source = U"";
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} else {
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_source = source.ptr();
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}
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_current = _source;
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line = 1;
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column = 1;
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length = p_source_code.length();
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position = 0;
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}
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void GDScriptTokenizer::set_cursor_position(int p_line, int p_column) {
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cursor_line = p_line;
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cursor_column = p_column;
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}
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void GDScriptTokenizer::set_multiline_mode(bool p_state) {
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multiline_mode = p_state;
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}
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int GDScriptTokenizer::get_cursor_line() const {
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return cursor_line;
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}
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int GDScriptTokenizer::get_cursor_column() const {
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return cursor_column;
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}
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bool GDScriptTokenizer::is_past_cursor() const {
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if (line < cursor_line) {
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return false;
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}
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if (line > cursor_line) {
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return true;
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}
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if (column < cursor_column) {
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return false;
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}
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return true;
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}
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char32_t GDScriptTokenizer::_advance() {
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if (unlikely(_is_at_end())) {
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return '\0';
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}
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_current++;
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column++;
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position++;
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if (column > rightmost_column) {
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rightmost_column = column;
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}
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if (unlikely(_is_at_end())) {
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// Add extra newline even if it's not there, to satisfy the parser.
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newline(true);
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// Also add needed unindent.
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check_indent();
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}
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return _peek(-1);
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}
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void GDScriptTokenizer::push_paren(char32_t p_char) {
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paren_stack.push_back(p_char);
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}
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bool GDScriptTokenizer::pop_paren(char32_t p_expected) {
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if (paren_stack.is_empty()) {
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return false;
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}
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char32_t actual = paren_stack.back()->get();
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paren_stack.pop_back();
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return actual == p_expected;
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}
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GDScriptTokenizer::Token GDScriptTokenizer::pop_error() {
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Token error = error_stack.back()->get();
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error_stack.pop_back();
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return error;
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}
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static bool _is_alphanumeric(char32_t c) {
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return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9') || c == '_';
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}
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static bool _is_digit(char32_t c) {
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return (c >= '0' && c <= '9');
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}
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static bool _is_hex_digit(char32_t c) {
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return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F');
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}
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static bool _is_binary_digit(char32_t c) {
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return (c == '0' || c == '1');
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}
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GDScriptTokenizer::Token GDScriptTokenizer::make_token(Token::Type p_type) {
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Token token(p_type);
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token.start_line = start_line;
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token.end_line = line;
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token.start_column = start_column;
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token.end_column = column;
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token.leftmost_column = leftmost_column;
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token.rightmost_column = rightmost_column;
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token.source = String(_start, _current - _start);
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if (p_type != Token::ERROR && cursor_line > -1) {
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// Also count whitespace after token.
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int offset = 0;
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while (_peek(offset) == ' ' || _peek(offset) == '\t') {
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offset++;
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}
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int last_column = column + offset;
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// Check cursor position in token.
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if (start_line == line) {
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// Single line token.
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if (cursor_line == start_line && cursor_column >= start_column && cursor_column <= last_column) {
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token.cursor_position = cursor_column - start_column;
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if (cursor_column == start_column) {
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token.cursor_place = CURSOR_BEGINNING;
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} else if (cursor_column < column) {
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token.cursor_place = CURSOR_MIDDLE;
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} else {
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token.cursor_place = CURSOR_END;
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}
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}
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} else {
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// Multi line token.
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if (cursor_line == start_line && cursor_column >= start_column) {
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// Is in first line.
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token.cursor_position = cursor_column - start_column;
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if (cursor_column == start_column) {
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token.cursor_place = CURSOR_BEGINNING;
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} else {
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token.cursor_place = CURSOR_MIDDLE;
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}
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} else if (cursor_line == line && cursor_column <= last_column) {
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// Is in last line.
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token.cursor_position = cursor_column - start_column;
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if (cursor_column < column) {
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token.cursor_place = CURSOR_MIDDLE;
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} else {
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token.cursor_place = CURSOR_END;
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}
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} else if (cursor_line > start_line && cursor_line < line) {
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// Is in middle line.
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token.cursor_position = CURSOR_MIDDLE;
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}
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}
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}
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return token;
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}
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GDScriptTokenizer::Token GDScriptTokenizer::make_literal(const Variant &p_literal) {
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Token token = make_token(Token::LITERAL);
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token.literal = p_literal;
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return token;
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}
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GDScriptTokenizer::Token GDScriptTokenizer::make_identifier(const StringName &p_identifier) {
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Token identifier = make_token(Token::IDENTIFIER);
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identifier.literal = p_identifier;
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return identifier;
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}
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GDScriptTokenizer::Token GDScriptTokenizer::make_error(const String &p_message) {
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Token error = make_token(Token::ERROR);
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error.literal = p_message;
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return error;
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}
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void GDScriptTokenizer::push_error(const String &p_message) {
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Token error = make_error(p_message);
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error_stack.push_back(error);
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}
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void GDScriptTokenizer::push_error(const Token &p_error) {
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error_stack.push_back(p_error);
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}
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GDScriptTokenizer::Token GDScriptTokenizer::make_paren_error(char32_t p_paren) {
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if (paren_stack.is_empty()) {
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return make_error(vformat("Closing \"%c\" doesn't have an opening counterpart.", p_paren));
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}
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Token error = make_error(vformat("Closing \"%c\" doesn't match the opening \"%c\".", p_paren, paren_stack.back()->get()));
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paren_stack.pop_back(); // Remove opening one anyway.
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return error;
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}
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GDScriptTokenizer::Token GDScriptTokenizer::check_vcs_marker(char32_t p_test, Token::Type p_double_type) {
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const char32_t *next = _current + 1;
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int chars = 2; // Two already matched.
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// Test before consuming characters, since we don't want to consume more than needed.
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while (*next == p_test) {
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chars++;
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next++;
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}
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if (chars >= 7) {
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// It is a VCS conflict marker.
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while (chars > 1) {
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// Consume all characters (first was already consumed by scan()).
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_advance();
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chars--;
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}
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return make_token(Token::VCS_CONFLICT_MARKER);
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} else {
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// It is only a regular double character token, so we consume the second character.
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_advance();
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return make_token(p_double_type);
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}
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}
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GDScriptTokenizer::Token GDScriptTokenizer::annotation() {
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if (!_is_alphanumeric(_peek())) {
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push_error("Expected annotation identifier after \"@\".");
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}
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while (_is_alphanumeric(_peek())) {
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// Consume all identifier characters.
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_advance();
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}
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Token annotation = make_token(Token::ANNOTATION);
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annotation.literal = StringName(annotation.source);
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return annotation;
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}
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GDScriptTokenizer::Token GDScriptTokenizer::potential_identifier() {
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#define KEYWORDS(KEYWORD_GROUP, KEYWORD) \
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KEYWORD_GROUP('a') \
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KEYWORD("as", Token::AS) \
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KEYWORD("and", Token::AND) \
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KEYWORD("assert", Token::ASSERT) \
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KEYWORD("await", Token::AWAIT) \
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KEYWORD_GROUP('b') \
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KEYWORD("break", Token::BREAK) \
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KEYWORD("breakpoint", Token::BREAKPOINT) \
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KEYWORD_GROUP('c') \
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KEYWORD("class", Token::CLASS) \
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KEYWORD("class_name", Token::CLASS_NAME) \
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KEYWORD("const", Token::CONST) \
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KEYWORD("continue", Token::CONTINUE) \
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KEYWORD_GROUP('e') \
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KEYWORD("elif", Token::ELIF) \
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KEYWORD("else", Token::ELSE) \
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KEYWORD("enum", Token::ENUM) \
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KEYWORD("extends", Token::EXTENDS) \
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KEYWORD_GROUP('f') \
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KEYWORD("for", Token::FOR) \
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KEYWORD("func", Token::FUNC) \
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KEYWORD_GROUP('i') \
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KEYWORD("if", Token::IF) \
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KEYWORD("in", Token::IN) \
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KEYWORD("is", Token::IS) \
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KEYWORD_GROUP('m') \
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KEYWORD("match", Token::MATCH) \
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KEYWORD_GROUP('n') \
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KEYWORD("namespace", Token::NAMESPACE) \
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KEYWORD("not", Token::NOT) \
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KEYWORD_GROUP('o') \
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KEYWORD("or", Token::OR) \
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KEYWORD_GROUP('p') \
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KEYWORD("pass", Token::PASS) \
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KEYWORD("preload", Token::PRELOAD) \
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KEYWORD_GROUP('r') \
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KEYWORD("return", Token::RETURN) \
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KEYWORD_GROUP('s') \
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KEYWORD("self", Token::SELF) \
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KEYWORD("signal", Token::SIGNAL) \
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KEYWORD("static", Token::STATIC) \
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KEYWORD("super", Token::SUPER) \
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KEYWORD_GROUP('t') \
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KEYWORD("trait", Token::TRAIT) \
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KEYWORD_GROUP('v') \
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KEYWORD("var", Token::VAR) \
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KEYWORD("void", Token::VOID) \
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KEYWORD_GROUP('w') \
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KEYWORD("while", Token::WHILE) \
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KEYWORD_GROUP('y') \
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KEYWORD("yield", Token::YIELD) \
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KEYWORD_GROUP('I') \
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KEYWORD("INF", Token::CONST_INF) \
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KEYWORD_GROUP('N') \
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KEYWORD("NAN", Token::CONST_NAN) \
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KEYWORD_GROUP('P') \
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KEYWORD("PI", Token::CONST_PI) \
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KEYWORD_GROUP('T') \
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KEYWORD("TAU", Token::CONST_TAU)
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|
|
#define MIN_KEYWORD_LENGTH 2
|
|
#define MAX_KEYWORD_LENGTH 10
|
|
|
|
// Consume all alphanumeric characters.
|
|
while (_is_alphanumeric(_peek())) {
|
|
_advance();
|
|
}
|
|
|
|
int length = _current - _start;
|
|
|
|
if (length == 1 && _peek(-1) == '_') {
|
|
// Lone underscore.
|
|
return make_token(Token::UNDERSCORE);
|
|
}
|
|
|
|
String name(_start, length);
|
|
if (length < MIN_KEYWORD_LENGTH || length > MAX_KEYWORD_LENGTH) {
|
|
// Cannot be a keyword, as the length doesn't match any.
|
|
return make_identifier(name);
|
|
}
|
|
|
|
// 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 == length && 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 (length == 4) {
|
|
if (name == "true") {
|
|
return make_literal(true);
|
|
} else if (name == "null") {
|
|
return make_literal(Variant());
|
|
}
|
|
} else if (length == 5) {
|
|
if (name == "false") {
|
|
return make_literal(false);
|
|
}
|
|
}
|
|
|
|
// Not a keyword, so must be an identifier.
|
|
return make_identifier(name);
|
|
|
|
#undef KEYWORDS
|
|
#undef MIN_KEYWORD_LENGTH
|
|
#undef MAX_KEYWORD_LENGTH
|
|
#undef KEYWORD_GROUP_CASE
|
|
#undef KEYWORD
|
|
}
|
|
|
|
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_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;
|
|
|
|
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();
|
|
}
|
|
}
|
|
|
|
// Allow '_' to be used in a number, for readability.
|
|
bool previous_was_underscore = false;
|
|
while (digit_check_func(_peek()) || _peek() == '_') {
|
|
if (_peek() == '_') {
|
|
if (previous_was_underscore) {
|
|
Token error = make_error(R"(Only one underscore can be used as a numeric separator.)");
|
|
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;
|
|
}
|
|
_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.
|
|
while (_is_digit(_peek()) || _peek() == '_') {
|
|
_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()) || _peek() == '_') {
|
|
if (_peek() == '_') {
|
|
if (previous_was_underscore) {
|
|
Token error = make_error(R"(Only one underscore can be used as a numeric separator.)");
|
|
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;
|
|
}
|
|
_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_alphanumeric(_peek())) {
|
|
// Letter at the end of the number.
|
|
push_error("Invalid numeric notation.");
|
|
}
|
|
|
|
// Create a string with the whole number.
|
|
int length = _current - _start;
|
|
String number = String(_start, length).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;
|
|
|
|
for (;;) {
|
|
// Consume actual string.
|
|
if (_is_at_end()) {
|
|
return make_error("Unterminated string.");
|
|
}
|
|
|
|
char32_t ch = _peek();
|
|
|
|
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':
|
|
// Hexadecimal sequence.
|
|
for (int i = 0; i < 4; i++) {
|
|
if (_is_at_end()) {
|
|
return make_error("Unterminated string.");
|
|
}
|
|
|
|
char32_t digit = _peek();
|
|
char32_t value = 0;
|
|
if (digit >= '0' && digit <= '9') {
|
|
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;
|
|
}
|
|
|
|
if (valid_escape) {
|
|
result += escaped;
|
|
}
|
|
} else if (ch == quote_char) {
|
|
_advance();
|
|
if (is_multiline) {
|
|
if (_peek() == quote_char && _peek(1) == quote_char) {
|
|
// Ended the multiline string. Consume all quotes.
|
|
_advance();
|
|
_advance();
|
|
break;
|
|
}
|
|
} else {
|
|
// Ended single-line string.
|
|
break;
|
|
}
|
|
} else {
|
|
result += ch;
|
|
_advance();
|
|
if (ch == '\n') {
|
|
newline(false);
|
|
}
|
|
}
|
|
}
|
|
|
|
// 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 (mixed) {
|
|
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 (_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 (line_continuation || multiline_mode) {
|
|
// We cleared up all the whitespace at the beginning of the line.
|
|
// But if this is a continuation or multiline mode and we don't want any indentation change.
|
|
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\" for indentation instead \"%s\" as used before in the file.", String(¤t_indent_char, 1).c_escape(), String(&indent_char, 1).c_escape()));
|
|
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.
|
|
}
|
|
}
|
|
|
|
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_alphanumeric(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 {
|
|
return make_token(Token::PLUS);
|
|
}
|
|
case '-':
|
|
if (_peek() == '=') {
|
|
_advance();
|
|
return make_token(Token::MINUS_EQUAL);
|
|
} 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 {
|
|
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:
|
|
return make_error(vformat(R"(Unknown character "%s".")", String(&c, 1)));
|
|
}
|
|
}
|
|
|
|
GDScriptTokenizer::GDScriptTokenizer() {
|
|
#ifdef TOOLS_ENABLED
|
|
if (EditorSettings::get_singleton()) {
|
|
tab_size = EditorSettings::get_singleton()->get_setting("text_editor/indent/size");
|
|
}
|
|
#endif // TOOLS_ENABLED
|
|
}
|