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Unified Diff: pkg/compiler/lib/src/scanner/array_based_scanner.dart

Issue 693183006: Revert "Move dart2js from sdk/lib/_internal/compiler to pkg/compiler" (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart
Patch Set: Created 6 years, 1 month ago
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Index: pkg/compiler/lib/src/scanner/array_based_scanner.dart
diff --git a/pkg/compiler/lib/src/scanner/array_based_scanner.dart b/pkg/compiler/lib/src/scanner/array_based_scanner.dart
deleted file mode 100644
index 9fbf7152ce07bd77539bf8441d782680d4f6ec4c..0000000000000000000000000000000000000000
--- a/pkg/compiler/lib/src/scanner/array_based_scanner.dart
+++ /dev/null
@@ -1,220 +0,0 @@
-// Copyright (c) 2011, 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.
-
-part of scanner;
-
-abstract class ArrayBasedScanner extends AbstractScanner {
- ArrayBasedScanner(SourceFile file, bool includeComments)
- : super(file, includeComments);
-
- /**
- * The stack of open groups, e.g [: { ... ( .. :]
- * Each BeginGroupToken has a pointer to the token where the group
- * ends. This field is set when scanning the end group token.
- */
- Link<BeginGroupToken> groupingStack = const Link<BeginGroupToken>();
-
- /**
- * Appends a fixed token whose kind and content is determined by [info].
- * Appends an *operator* token from [info].
- *
- * An operator token represent operators like ':', '.', ';', '&&', '==', '--',
- * '=>', etc.
- */
- void appendPrecedenceToken(PrecedenceInfo info) {
- tail.next = new SymbolToken(info, tokenStart);
- tail = tail.next;
- }
-
- /**
- * Appends a fixed token based on whether the current char is [choice] or not.
- * If the current char is [choice] a fixed token whose kind and content
- * is determined by [yes] is appended, otherwise a fixed token whose kind
- * and content is determined by [no] is appended.
- */
- int select(int choice, PrecedenceInfo yes, PrecedenceInfo no) {
- int next = advance();
- if (identical(next, choice)) {
- appendPrecedenceToken(yes);
- return advance();
- } else {
- appendPrecedenceToken(no);
- return next;
- }
- }
-
- /**
- * Appends a keyword token whose kind is determined by [keyword].
- */
- void appendKeywordToken(Keyword keyword) {
- String syntax = keyword.syntax;
- // Type parameters and arguments cannot contain 'this' or 'super'.
- if (identical(syntax, 'this') || identical(syntax, 'super')) {
- discardOpenLt();
- }
- tail.next = new KeywordToken(keyword, tokenStart);
- tail = tail.next;
- }
-
- void appendEofToken() {
- beginToken();
- discardOpenLt();
- while (!groupingStack.isEmpty) {
- unmatchedBeginGroup(groupingStack.head);
- groupingStack = groupingStack.tail;
- }
- tail.next = new SymbolToken(EOF_INFO, tokenStart);
- tail = tail.next;
- // EOF points to itself so there's always infinite look-ahead.
- tail.next = tail;
- }
-
- /**
- * Notifies scanning a whitespace character. Note that [appendWhiteSpace] is
- * not always invoked for [$SPACE] characters.
- *
- * This method is used by the scanners to track line breaks and create the
- * [lineStarts] map.
- */
- void appendWhiteSpace(int next) {
- if (next == $LF && file != null) {
- lineStarts.add(stringOffset + 1); // +1, the line starts after the $LF.
- }
- }
-
- /**
- * Notifies on [$LF] characters in multi-line comments or strings.
- *
- * This method is used by the scanners to track line breaks and create the
- * [lineStarts] map.
- */
- void lineFeedInMultiline() {
- if (file != null) {
- lineStarts.add(stringOffset + 1);
- }
- }
-
- /**
- * Appends a token that begins a new group, represented by [value].
- * Group begin tokens are '{', '(', '[' and '${'.
- */
- void appendBeginGroup(PrecedenceInfo info) {
- Token token = new BeginGroupToken(info, tokenStart);
- tail.next = token;
- tail = tail.next;
-
- // { ( [ ${ cannot appear inside a type parameters / arguments.
- if (!identical(info.kind, LT_TOKEN)) discardOpenLt();
- groupingStack = groupingStack.prepend(token);
- }
-
- /**
- * Appends a token that begins an end group, represented by [value].
- * It handles the group end tokens '}', ')' and ']'. The tokens '>' and
- * '>>' are handled separately bo [appendGt] and [appendGtGt].
- */
- int appendEndGroup(PrecedenceInfo info, int openKind) {
- assert(!identical(openKind, LT_TOKEN)); // openKind is < for > and >>
- discardBeginGroupUntil(openKind);
- appendPrecedenceToken(info);
- Token close = tail;
- if (groupingStack.isEmpty) {
- return advance();
- }
- BeginGroupToken begin = groupingStack.head;
- if (!identical(begin.kind, openKind)) {
- assert(begin.kind == STRING_INTERPOLATION_TOKEN &&
- openKind == OPEN_CURLY_BRACKET_TOKEN);
- // We're ending an interpolated expression.
- begin.endGroup = close;
- groupingStack = groupingStack.tail;
- // Using "start-of-text" to signal that we're back in string
- // scanning mode.
- return $STX;
- }
- begin.endGroup = close;
- groupingStack = groupingStack.tail;
- return advance();
- }
-
- /**
- * Discards begin group tokens until a match with [openKind] is found.
- * This recovers nicely from from a situation like "{[}".
- */
- void discardBeginGroupUntil(int openKind) {
- while (!groupingStack.isEmpty) {
- // Don't report unmatched errors for <; it is also the less-than operator.
- discardOpenLt();
- if (groupingStack.isEmpty) return;
- BeginGroupToken begin = groupingStack.head;
- if (openKind == begin.kind) return;
- if (openKind == OPEN_CURLY_BRACKET_TOKEN &&
- begin.kind == STRING_INTERPOLATION_TOKEN) return;
- unmatchedBeginGroup(begin);
- groupingStack = groupingStack.tail;
- }
- }
-
- /**
- * Appends a token for '>'.
- * This method does not issue unmatched errors, because > is also the
- * greater-than operator. It does not necessarily have to close a group.
- */
- void appendGt(PrecedenceInfo info) {
- appendPrecedenceToken(info);
- if (groupingStack.isEmpty) return;
- if (identical(groupingStack.head.kind, LT_TOKEN)) {
- groupingStack.head.endGroup = tail;
- groupingStack = groupingStack.tail;
- }
- }
-
- /**
- * Appends a token for '>>'.
- * This method does not issue unmatched errors, because >> is also the
- * shift operator. It does not necessarily have to close a group.
- */
- void appendGtGt(PrecedenceInfo info) {
- appendPrecedenceToken(info);
- if (groupingStack.isEmpty) return;
- if (identical(groupingStack.head.kind, LT_TOKEN)) {
- // Don't assign endGroup: in "T<U<V>>", the '>>' token closes the outer
- // '<', the inner '<' is left without endGroup.
- groupingStack = groupingStack.tail;
- }
- if (groupingStack.isEmpty) return;
- if (identical(groupingStack.head.kind, LT_TOKEN)) {
- groupingStack.head.endGroup = tail;
- groupingStack = groupingStack.tail;
- }
- }
-
- void appendComment(start, bool asciiOnly) {
- if (!includeComments) return;
- appendSubstringToken(COMMENT_INFO, start, asciiOnly);
- }
-
- void appendErrorToken(ErrorToken token) {
- tail.next = token;
- tail = token;
- }
-
- /**
- * This method is called to discard '<' from the "grouping" stack.
- *
- * [PartialParser.skipExpression] relies on the fact that we do not
- * create groups for stuff like:
- * [:a = b < c, d = e > f:].
- *
- * In other words, this method is called when the scanner recognizes
- * something which cannot possibly be part of a type parameter/argument
- * list, like the '=' in the above example.
- */
- void discardOpenLt() {
- while (!groupingStack.isEmpty
- && identical(groupingStack.head.kind, LT_TOKEN)) {
- groupingStack = groupingStack.tail;
- }
- }
-}
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