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Diffstat (limited to 'js/src/new-regexp/regexp-parser.h')
| -rw-r--r-- | js/src/new-regexp/regexp-parser.h | 363 |
1 files changed, 0 insertions, 363 deletions
diff --git a/js/src/new-regexp/regexp-parser.h b/js/src/new-regexp/regexp-parser.h deleted file mode 100644 index 1b2a9fe18c..0000000000 --- a/js/src/new-regexp/regexp-parser.h +++ /dev/null @@ -1,363 +0,0 @@ -// Copyright 2016 the V8 project authors. All rights reserved. -// Use of this source code is governed by a BSD-style license that can be -// found in the LICENSE file. - -#ifndef V8_REGEXP_REGEXP_PARSER_H_ -#define V8_REGEXP_REGEXP_PARSER_H_ - -#include "new-regexp/regexp-ast.h" -#include "new-regexp/regexp-error.h" - -namespace v8 { -namespace internal { - -struct RegExpCompileData; - -// A BufferedZoneList is an automatically growing list, just like (and backed -// by) a ZoneList, that is optimized for the case of adding and removing -// a single element. The last element added is stored outside the backing list, -// and if no more than one element is ever added, the ZoneList isn't even -// allocated. -// Elements must not be nullptr pointers. -template <typename T, int initial_size> -class BufferedZoneList { - public: - BufferedZoneList() : list_(nullptr), last_(nullptr) {} - - // Adds element at end of list. This element is buffered and can - // be read using last() or removed using RemoveLast until a new Add or until - // RemoveLast or GetList has been called. - void Add(T* value, Zone* zone) { - if (last_ != nullptr) { - if (list_ == nullptr) { - list_ = new (zone) ZoneList<T*>(initial_size, zone); - } - list_->Add(last_, zone); - } - last_ = value; - } - - T* last() { - DCHECK(last_ != nullptr); - return last_; - } - - T* RemoveLast() { - DCHECK(last_ != nullptr); - T* result = last_; - if ((list_ != nullptr) && (list_->length() > 0)) - last_ = list_->RemoveLast(); - else - last_ = nullptr; - return result; - } - - T* Get(int i) { - DCHECK((0 <= i) && (i < length())); - if (list_ == nullptr) { - DCHECK_EQ(0, i); - return last_; - } else { - if (i == list_->length()) { - DCHECK(last_ != nullptr); - return last_; - } else { - return list_->at(i); - } - } - } - - void Clear() { - list_ = nullptr; - last_ = nullptr; - } - - int length() { - int length = (list_ == nullptr) ? 0 : list_->length(); - return length + ((last_ == nullptr) ? 0 : 1); - } - - ZoneList<T*>* GetList(Zone* zone) { - if (list_ == nullptr) { - list_ = new (zone) ZoneList<T*>(initial_size, zone); - } - if (last_ != nullptr) { - list_->Add(last_, zone); - last_ = nullptr; - } - return list_; - } - - private: - ZoneList<T*>* list_; - T* last_; -}; - - -// Accumulates RegExp atoms and assertions into lists of terms and alternatives. -class RegExpBuilder : public ZoneObject { - public: - RegExpBuilder(Zone* zone, JSRegExp::Flags flags); - void AddCharacter(uc16 character); - void AddUnicodeCharacter(uc32 character); - void AddEscapedUnicodeCharacter(uc32 character); - // "Adds" an empty expression. Does nothing except consume a - // following quantifier - void AddEmpty(); - void AddCharacterClass(RegExpCharacterClass* cc); - void AddCharacterClassForDesugaring(uc32 c); - void AddAtom(RegExpTree* tree); - void AddTerm(RegExpTree* tree); - void AddAssertion(RegExpTree* tree); - void NewAlternative(); // '|' - bool AddQuantifierToAtom(int min, int max, - RegExpQuantifier::QuantifierType type); - void FlushText(); - RegExpTree* ToRegExp(); - JSRegExp::Flags flags() const { return flags_; } - void set_flags(JSRegExp::Flags flags) { flags_ = flags; } - - bool ignore_case() const { return (flags_ & JSRegExp::kIgnoreCase) != 0; } - bool multiline() const { return (flags_ & JSRegExp::kMultiline) != 0; } - bool dotall() const { return (flags_ & JSRegExp::kDotAll) != 0; } - - private: - static const uc16 kNoPendingSurrogate = 0; - void AddLeadSurrogate(uc16 lead_surrogate); - void AddTrailSurrogate(uc16 trail_surrogate); - void FlushPendingSurrogate(); - void FlushCharacters(); - void FlushTerms(); - bool NeedsDesugaringForUnicode(RegExpCharacterClass* cc); - bool NeedsDesugaringForIgnoreCase(uc32 c); - Zone* zone() const { return zone_; } - bool unicode() const { return (flags_ & JSRegExp::kUnicode) != 0; } - - Zone* zone_; - bool pending_empty_; - JSRegExp::Flags flags_; - ZoneList<uc16>* characters_; - uc16 pending_surrogate_; - BufferedZoneList<RegExpTree, 2> terms_; - BufferedZoneList<RegExpTree, 2> text_; - BufferedZoneList<RegExpTree, 2> alternatives_; -#ifdef DEBUG - enum { ADD_NONE, ADD_CHAR, ADD_TERM, ADD_ASSERT, ADD_ATOM } last_added_; -#define LAST(x) last_added_ = x; -#else -#define LAST(x) -#endif -}; - -class V8_EXPORT_PRIVATE RegExpParser { - public: - RegExpParser(FlatStringReader* in, JSRegExp::Flags flags, Isolate* isolate, - Zone* zone); - - static bool ParseRegExp(Isolate* isolate, Zone* zone, FlatStringReader* input, - JSRegExp::Flags flags, RegExpCompileData* result); - - RegExpTree* ParsePattern(); - RegExpTree* ParseDisjunction(); - RegExpTree* ParseGroup(); - - // Parses a {...,...} quantifier and stores the range in the given - // out parameters. - bool ParseIntervalQuantifier(int* min_out, int* max_out); - - // Parses and returns a single escaped character. The character - // must not be 'b' or 'B' since they are usually handle specially. - uc32 ParseClassCharacterEscape(); - - // Checks whether the following is a length-digit hexadecimal number, - // and sets the value if it is. - bool ParseHexEscape(int length, uc32* value); - bool ParseUnicodeEscape(uc32* value); - bool ParseUnlimitedLengthHexNumber(int max_value, uc32* value); - - bool ParsePropertyClassName(ZoneVector<char>* name_1, - ZoneVector<char>* name_2); - bool AddPropertyClassRange(ZoneList<CharacterRange>* add_to, bool negate, - const ZoneVector<char>& name_1, - const ZoneVector<char>& name_2); - - RegExpTree* GetPropertySequence(const ZoneVector<char>& name_1); - RegExpTree* ParseCharacterClass(const RegExpBuilder* state); - - uc32 ParseOctalLiteral(); - - // Tries to parse the input as a back reference. If successful it - // stores the result in the output parameter and returns true. If - // it fails it will push back the characters read so the same characters - // can be reparsed. - bool ParseBackReferenceIndex(int* index_out); - - // Parse inside a class. Either add escaped class to the range, or return - // false and pass parsed single character through |char_out|. - void ParseClassEscape(ZoneList<CharacterRange>* ranges, Zone* zone, - bool add_unicode_case_equivalents, uc32* char_out, - bool* is_class_escape); - - char ParseClassEscape(); - - RegExpTree* ReportError(RegExpError error); - void Advance(); - void Advance(int dist); - void Reset(int pos); - - // Reports whether the pattern might be used as a literal search string. - // Only use if the result of the parse is a single atom node. - bool simple(); - bool contains_anchor() { return contains_anchor_; } - void set_contains_anchor() { contains_anchor_ = true; } - int captures_started() { return captures_started_; } - int position() { return next_pos_ - 1; } - bool failed() { return failed_; } - // The Unicode flag can't be changed using in-regexp syntax, so it's OK to - // just read the initial flag value here. - bool unicode() const { return (top_level_flags_ & JSRegExp::kUnicode) != 0; } - - static bool IsSyntaxCharacterOrSlash(uc32 c); - - static const uc32 kEndMarker = (1 << 21); - - private: - enum SubexpressionType { - INITIAL, - CAPTURE, // All positive values represent captures. - POSITIVE_LOOKAROUND, - NEGATIVE_LOOKAROUND, - GROUPING - }; - - class RegExpParserState : public ZoneObject { - public: - // Push a state on the stack. - RegExpParserState(RegExpParserState* previous_state, - SubexpressionType group_type, - RegExpLookaround::Type lookaround_type, - int disjunction_capture_index, - const ZoneVector<uc16>* capture_name, - JSRegExp::Flags flags, Zone* zone) - : previous_state_(previous_state), - builder_(new (zone) RegExpBuilder(zone, flags)), - group_type_(group_type), - lookaround_type_(lookaround_type), - disjunction_capture_index_(disjunction_capture_index), - capture_name_(capture_name) {} - // Parser state of containing expression, if any. - RegExpParserState* previous_state() const { return previous_state_; } - bool IsSubexpression() { return previous_state_ != nullptr; } - // RegExpBuilder building this regexp's AST. - RegExpBuilder* builder() const { return builder_; } - // Type of regexp being parsed (parenthesized group or entire regexp). - SubexpressionType group_type() const { return group_type_; } - // Lookahead or Lookbehind. - RegExpLookaround::Type lookaround_type() const { return lookaround_type_; } - // Index in captures array of first capture in this sub-expression, if any. - // Also the capture index of this sub-expression itself, if group_type - // is CAPTURE. - int capture_index() const { return disjunction_capture_index_; } - // The name of the current sub-expression, if group_type is CAPTURE. Only - // used for named captures. - const ZoneVector<uc16>* capture_name() const { return capture_name_; } - - bool IsNamedCapture() const { return capture_name_ != nullptr; } - - // Check whether the parser is inside a capture group with the given index. - bool IsInsideCaptureGroup(int index); - // Check whether the parser is inside a capture group with the given name. - bool IsInsideCaptureGroup(const ZoneVector<uc16>* name); - - private: - // Linked list implementation of stack of states. - RegExpParserState* const previous_state_; - // Builder for the stored disjunction. - RegExpBuilder* const builder_; - // Stored disjunction type (capture, look-ahead or grouping), if any. - const SubexpressionType group_type_; - // Stored read direction. - const RegExpLookaround::Type lookaround_type_; - // Stored disjunction's capture index (if any). - const int disjunction_capture_index_; - // Stored capture name (if any). - const ZoneVector<uc16>* const capture_name_; - }; - - // Return the 1-indexed RegExpCapture object, allocate if necessary. - RegExpCapture* GetCapture(int index); - - // Creates a new named capture at the specified index. Must be called exactly - // once for each named capture. Fails if a capture with the same name is - // encountered. - bool CreateNamedCaptureAtIndex(const ZoneVector<uc16>* name, int index); - - // Parses the name of a capture group (?<name>pattern). The name must adhere - // to IdentifierName in the ECMAScript standard. - const ZoneVector<uc16>* ParseCaptureGroupName(); - - bool ParseNamedBackReference(RegExpBuilder* builder, - RegExpParserState* state); - RegExpParserState* ParseOpenParenthesis(RegExpParserState* state); - - // After the initial parsing pass, patch corresponding RegExpCapture objects - // into all RegExpBackReferences. This is done after initial parsing in order - // to avoid complicating cases in which references comes before the capture. - void PatchNamedBackReferences(); - - Handle<FixedArray> CreateCaptureNameMap(); - - // Returns true iff the pattern contains named captures. May call - // ScanForCaptures to look ahead at the remaining pattern. - bool HasNamedCaptures(); - - Isolate* isolate() { return isolate_; } - Zone* zone() const { return zone_; } - - uc32 current() { return current_; } - bool has_more() { return has_more_; } - bool has_next() { return next_pos_ < in()->length(); } - uc32 Next(); - template <bool update_position> - uc32 ReadNext(); - FlatStringReader* in() { return in_; } - void ScanForCaptures(); - - struct RegExpCaptureNameLess { - bool operator()(const RegExpCapture* lhs, const RegExpCapture* rhs) const { - DCHECK_NOT_NULL(lhs); - DCHECK_NOT_NULL(rhs); - ZoneVector<uc16> lhname = *lhs->name(); - ZoneVector<uc16> rhname = *rhs->name(); - return lhname < rhname; - } - }; - - Isolate* isolate_; - Zone* zone_; - RegExpError error_ = RegExpError::kNone; - int error_pos_ = 0; - ZoneList<RegExpCapture*>* captures_; - ZoneSet<RegExpCapture*, RegExpCaptureNameLess>* named_captures_; - ZoneList<RegExpBackReference*>* named_back_references_; - FlatStringReader* in_; - uc32 current_; - // These are the flags specified outside the regexp syntax ie after the - // terminating '/' or in the second argument to the constructor. The current - // flags are stored on the RegExpBuilder. - JSRegExp::Flags top_level_flags_; - int next_pos_; - int captures_started_; - int capture_count_; // Only valid after we have scanned for captures. - bool has_more_; - bool simple_; - bool contains_anchor_; - bool is_scanned_for_captures_; - bool has_named_captures_; // Only valid after we have scanned for captures. - bool failed_; -}; - -} // namespace internal -} // namespace v8 - -#endif // V8_REGEXP_REGEXP_PARSER_H_ |