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Unified Diff: frog/tokenizer.dart

Issue 10548047: Remove frog from the repository. (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart
Patch Set: Move test and update apidoc.gyp. Created 8 years, 6 months ago
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Index: frog/tokenizer.dart
diff --git a/frog/tokenizer.dart b/frog/tokenizer.dart
deleted file mode 100644
index 16b38af86124bbdb01aea08142f06ea7ee2ed02a..0000000000000000000000000000000000000000
--- a/frog/tokenizer.dart
+++ /dev/null
@@ -1,482 +0,0 @@
-// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-// Generated by scripts/tokenizer_gen.py.
-
-
-interface TokenSource {
- Token next();
-}
-
-class InterpStack {
- InterpStack next, previous;
- final int quote;
- final bool isMultiline;
- int depth;
-
- InterpStack(this.previous, this.quote, this.isMultiline): depth = -1;
-
- InterpStack pop() {
- return this.previous;
- }
-
- static InterpStack push(InterpStack stack, int quote, bool isMultiline) {
- var newStack = new InterpStack(stack, quote, isMultiline);
- if (stack != null) newStack.previous = stack;
- return newStack;
- }
-}
-
-/**
- * The base class for our tokenizer. The hand coded parts are in this file, with
- * the generated parts in the subclass Tokenizer.
- */
-class TokenizerBase extends TokenizerHelpers implements TokenSource {
- final SourceFile _source;
- final bool _skipWhitespace;
- String _text;
-
- int _index;
- int _startIndex;
-
- /** Keeps track of string interpolation state. */
- InterpStack _interpStack;
-
- TokenizerBase(this._source, this._skipWhitespace, [index = 0])
- : this._index = index {
- _text = _source.text;
- }
-
- abstract Token next();
- abstract int getIdentifierKind();
-
- int _nextChar() {
- if (_index < _text.length) {
- return _text.charCodeAt(_index++);
- } else {
- return 0;
- }
- }
-
- int _peekChar() {
- if (_index < _text.length) {
- return _text.charCodeAt(_index);
- } else {
- return 0;
- }
- }
-
- bool _maybeEatChar(int ch) {
- if (_index < _text.length) {
- if (_text.charCodeAt(_index) == ch) {
- _index++;
- return true;
- } else {
- return false;
- }
- } else {
- return false;
- }
- }
-
- String _tokenText() {
- if (_index < _text.length) {
- return _text.substring(_startIndex, _index);
- } else {
- return _text.substring(_startIndex, _text.length);
- }
- }
-
- Token _finishToken(int kind) {
- return new Token(kind, _source, _startIndex, _index);
- }
-
- Token _errorToken([String message = null]) {
- return new ErrorToken(
- TokenKind.ERROR, _source, _startIndex, _index, message);
- }
-
- Token finishWhitespace() {
- _index--;
- while (_index < _text.length) {
- final ch = _text.charCodeAt(_index++);
- if (ch == 32/*' '*/ || ch == 9/*'\t'*/ || ch == 13/*'\r'*/) {
- // do nothing
- } else if (ch == 10/*'\n'*/) {
- if (!_skipWhitespace) {
- return _finishToken(TokenKind.WHITESPACE); // note the newline?
- }
- } else {
- _index--;
- if (_skipWhitespace) {
- return next();
- } else {
- return _finishToken(TokenKind.WHITESPACE);
- }
- }
-
- }
- return _finishToken(TokenKind.END_OF_FILE);
- }
-
- Token finishHashBang() {
- while (true) {
- int ch = _nextChar();
- if (ch == 0 || ch == 10/*'\n'*/ || ch == 13/*'\r'*/) {
- return _finishToken(TokenKind.HASHBANG);
- }
- }
- }
-
- Token finishSingleLineComment() {
- while (true) {
- int ch = _nextChar();
- if (ch == 0 || ch == 10/*'\n'*/ || ch == 13/*'\r'*/) {
- if (_skipWhitespace) {
- return next();
- } else {
- return _finishToken(TokenKind.COMMENT);
- }
- }
- }
- }
-
- Token finishMultiLineComment() {
- int nesting = 1;
- do {
- int ch = _nextChar();
- if (ch == 0) {
- return _errorToken();
- } else if (ch == 42/*'*'*/) {
- if (_maybeEatChar(47/*'/'*/)) {
- nesting--;
- }
- } else if (ch == 47/*'/'*/) {
- if (_maybeEatChar(42/*'*'*/)) {
- nesting++;
- }
- }
- } while (nesting > 0);
-
- if (_skipWhitespace) {
- return next();
- } else {
- return _finishToken(TokenKind.COMMENT);
- }
- }
-
- void eatDigits() {
- while (_index < _text.length) {
- if (TokenizerHelpers.isDigit(_text.charCodeAt(_index))) {
- _index++;
- } else {
- return;
- }
- }
- }
-
- static int _hexDigit(int c) {
- if(c >= 48/*0*/ && c <= 57/*9*/) {
- return c - 48;
- } else if (c >= 97/*a*/ && c <= 102/*f*/) {
- return c - 87;
- } else if (c >= 65/*A*/ && c <= 70/*F*/) {
- return c - 55;
- } else {
- return -1;
- }
- }
-
- int readHex([int hexLength]) {
- int maxIndex;
- if (hexLength === null) {
- maxIndex = _text.length - 1;
- } else {
- // TODO(jimhug): What if this is too long?
- maxIndex = _index + hexLength;
- if (maxIndex >= _text.length) return -1;
- }
- var result = 0;
- while (_index < maxIndex) {
- final digit = _hexDigit(_text.charCodeAt(_index));
- if (digit == -1) {
- if (hexLength === null) {
- return result;
- } else {
- return -1;
- }
- }
- _hexDigit(_text.charCodeAt(_index));
- // Multiply by 16 rather than shift by 4 since that will result in a
- // correct value for numbers that exceed the 32 bit precision of JS
- // 'integers'.
- // TODO: Figure out a better solution to integer truncation. Issue 638.
- result = (result * 16) + digit;
- _index++;
- }
-
- return result;
- }
-
- Token finishHex() {
- final value = readHex();
- return new LiteralToken(TokenKind.HEX_INTEGER, _source, _startIndex,
- _index, value);
- }
-
- Token finishNumber() {
- eatDigits();
-
- if (_peekChar() == 46/*.*/) {
- // Handle the case of 1.toString().
- _nextChar();
- if (TokenizerHelpers.isDigit(_peekChar())) {
- eatDigits();
- return finishNumberExtra(TokenKind.DOUBLE);
- } else {
- _index--;
- }
- }
-
- return finishNumberExtra(TokenKind.INTEGER);
- }
-
- Token finishNumberExtra(int kind) {
- if (_maybeEatChar(101/*e*/) || _maybeEatChar(69/*E*/)) {
- kind = TokenKind.DOUBLE;
- _maybeEatChar(45/*-*/);
- _maybeEatChar(43/*+*/);
- eatDigits();
- }
- if (_peekChar() != 0 && TokenizerHelpers.isIdentifierStart(_peekChar())) {
- _nextChar();
- return _errorToken("illegal character in number");
- }
-
- return _finishToken(kind);
- }
-
- Token _makeStringToken(List<int> buf, bool isPart) {
- final s = new String.fromCharCodes(buf);
- final kind = isPart ? TokenKind.STRING_PART : TokenKind.STRING;
- return new LiteralToken(kind, _source, _startIndex, _index, s);
- }
-
- Token _makeRawStringToken(bool isMultiline) {
- String s;
- if (isMultiline) {
- // Skip initial newline in multiline strings
- int start = _startIndex + 4;
- if (_source.text[start] == '\n') start++;
- s = _source.text.substring(start, _index - 3);
- } else {
- s = _source.text.substring(_startIndex + 2, _index - 1);
- }
- return new LiteralToken(TokenKind.STRING, _source, _startIndex, _index, s);
- }
-
- Token finishMultilineString(int quote) {
- var buf = <int>[];
- while (true) {
- int ch = _nextChar();
- if (ch == 0) {
- return _errorToken();
- } else if (ch == quote) {
- if (_maybeEatChar(quote)) {
- if (_maybeEatChar(quote)) {
- return _makeStringToken(buf, false);
- }
- buf.add(quote);
- }
- buf.add(quote);
- } else if (ch == 36/*$*/) {
- // start of string interp
- _interpStack = InterpStack.push(_interpStack, quote, true);
- return _makeStringToken(buf, true);
- } else if (ch == 92/*\*/) {
- var escapeVal = readEscapeSequence();
- if (escapeVal == -1) {
- return _errorToken("invalid hex escape sequence");
- } else {
- buf.add(escapeVal);
- }
- } else {
- buf.add(ch);
- }
- }
- }
-
- Token _finishOpenBrace() {
- if (_interpStack != null) {
- if (_interpStack.depth == -1) {
- _interpStack.depth = 1;
- } else {
- assert(_interpStack.depth >= 0);
- _interpStack.depth += 1;
- }
- }
- return _finishToken(TokenKind.LBRACE);
- }
-
- Token _finishCloseBrace() {
- if (_interpStack != null) {
- _interpStack.depth -= 1;
- assert(_interpStack.depth >= 0);
- }
- return _finishToken(TokenKind.RBRACE);
- }
-
- Token finishString(int quote) {
- if (_maybeEatChar(quote)) {
- if (_maybeEatChar(quote)) {
- // skip an initial newline
- _maybeEatChar(10/*'\n'*/);
- return finishMultilineString(quote);
- } else {
- return _makeStringToken(new List<int>(), false);
- }
- }
- return finishStringBody(quote);
- }
-
- Token finishRawString(int quote) {
- if (_maybeEatChar(quote)) {
- if (_maybeEatChar(quote)) {
- return finishMultilineRawString(quote);
- } else {
- return _makeStringToken(<int>[], false);
- }
- }
- while (true) {
- int ch = _nextChar();
- if (ch == quote) {
- return _makeRawStringToken(false);
- } else if (ch == 0) {
- return _errorToken();
- }
- }
- }
-
- Token finishMultilineRawString(int quote) {
- while (true) {
- int ch = _nextChar();
- if (ch == 0) {
- return _errorToken();
- } else if (ch == quote && _maybeEatChar(quote) && _maybeEatChar(quote)) {
- return _makeRawStringToken(true);
- }
- }
- }
-
- Token finishStringBody(int quote) {
- var buf = new List<int>();
- while (true) {
- int ch = _nextChar();
- if (ch == quote) {
- return _makeStringToken(buf, false);
- } else if (ch == 36/*$*/) {
- // start of string interp
- _interpStack = InterpStack.push(_interpStack, quote, false);
- return _makeStringToken(buf, true);
- } else if (ch == 0) {
- return _errorToken();
- } else if (ch == 92/*\*/) {
- var escapeVal = readEscapeSequence();
- if (escapeVal == -1) {
- return _errorToken("invalid hex escape sequence");
- } else {
- buf.add(escapeVal);
- }
- } else {
- buf.add(ch);
- }
- }
- }
-
- int readEscapeSequence() {
- final ch = _nextChar();
- int hexValue;
- switch (ch) {
- case 110/*n*/:
- return 0x0a/*'\n'*/;
- case 114/*r*/:
- return 0x0d/*'\r'*/;
- case 102/*f*/:
- return 0x0c/*'\f'*/;
- case 98/*b*/:
- return 0x08/*'\b'*/;
- case 116/*t*/:
- return 0x09/*'\t'*/;
- case 118/*v*/:
- return 0x0b/*'\v'*/;
- case 120/*x*/:
- hexValue = readHex(2);
- break;
- case 117/*u*/:
- if (_maybeEatChar(123/*{*/)) {
- hexValue = readHex();
- if (!_maybeEatChar(125/*}*/)) {
- return -1;
- } else {
- break;
- }
- } else {
- hexValue = readHex(4);
- break;
- }
- default: return ch;
- }
-
- if (hexValue == -1) return -1;
-
- // According to the Unicode standard the high and low surrogate halves
- // used by UTF-16 (U+D800 through U+DFFF) and values above U+10FFFF
- // are not legal Unicode values.
- if (hexValue < 0xD800 || hexValue > 0xDFFF && hexValue <= 0xFFFF) {
- return hexValue;
- } else if (hexValue <= 0x10FFFF){
- world.fatal('unicode values greater than 2 bytes not implemented yet');
- return -1;
- } else {
- return -1;
- }
- }
-
- Token finishDot() {
- if (TokenizerHelpers.isDigit(_peekChar())) {
- eatDigits();
- return finishNumberExtra(TokenKind.DOUBLE);
- } else {
- return _finishToken(TokenKind.DOT);
- }
- }
-
- Token finishIdentifier(int ch) {
- if (_interpStack != null && _interpStack.depth == -1) {
- _interpStack.depth = 0;
- if (ch == 36/*$*/) {
- return _errorToken(
- @"illegal character after $ in string interpolation");
- }
- while (_index < _text.length) {
- if (!TokenizerHelpers.isInterpIdentifierPart(_text.charCodeAt(_index++))) {
- _index--;
- break;
- }
- }
- } else {
- while (_index < _text.length) {
- if (!TokenizerHelpers.isIdentifierPart(_text.charCodeAt(_index++))) {
- _index--;
- break;
- }
- }
- }
- int kind = getIdentifierKind();
- if (kind == TokenKind.IDENTIFIER) {
- return _finishToken(TokenKind.IDENTIFIER);
- } else {
- return _finishToken(kind);
- }
- }
-}
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