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sdk/runtime/vm/regexp_parser.cc
T
zerny@google.com 94a510176b Copy irregexp related code from V8. 
This "syntactic" change copies the irregexp code from V8 r24065 to Dart.
Compared to the V8 files the only changes are that the files have been
suitably renamed, headers and footers have been updated, and most of the
unneeded code has been replaced by a 'SNIP' marker. None of the files
are added to the build and they cannot compile. Integration with the
Dart VM is done in a follow-up CL [1].

[1]: https://codereview.chromium.org/683433003/

BUG=
R=iposva@google.com

Review URL: https://codereview.chromium.org//678193004

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@41455 260f80e4-7a28-3924-810f-c04153c831b5
2014-11-03 10:00:31 +00:00

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// Copyright (c) 2014, 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.
#include "vm/regexp_parser.h"
// SNIP
namespace dart {
RegExpBuilder::RegExpBuilder(Zone* zone)
: zone_(zone),
pending_empty_(false),
characters_(NULL),
terms_(),
alternatives_()
#ifdef DEBUG
, last_added_(ADD_NONE)
#endif
{}
void RegExpBuilder::FlushCharacters() {
pending_empty_ = false;
if (characters_ != NULL) {
RegExpTree* atom = new(zone()) RegExpAtom(characters_->ToConstVector());
characters_ = NULL;
text_.Add(atom, zone());
LAST(ADD_ATOM);
}
}
void RegExpBuilder::FlushText() {
FlushCharacters();
int num_text = text_.length();
if (num_text == 0) {
return;
} else if (num_text == 1) {
terms_.Add(text_.last(), zone());
} else {
RegExpText* text = new(zone()) RegExpText(zone());
for (int i = 0; i < num_text; i++)
text_.Get(i)->AppendToText(text, zone());
terms_.Add(text, zone());
}
text_.Clear();
}
void RegExpBuilder::AddCharacter(uc16 c) {
pending_empty_ = false;
if (characters_ == NULL) {
characters_ = new(zone()) ZoneList<uc16>(4, zone());
}
characters_->Add(c, zone());
LAST(ADD_CHAR);
}
void RegExpBuilder::AddEmpty() {
pending_empty_ = true;
}
void RegExpBuilder::AddAtom(RegExpTree* term) {
if (term->IsEmpty()) {
AddEmpty();
return;
}
if (term->IsTextElement()) {
FlushCharacters();
text_.Add(term, zone());
} else {
FlushText();
terms_.Add(term, zone());
}
LAST(ADD_ATOM);
}
void RegExpBuilder::AddAssertion(RegExpTree* assert) {
FlushText();
terms_.Add(assert, zone());
LAST(ADD_ASSERT);
}
void RegExpBuilder::NewAlternative() {
FlushTerms();
}
void RegExpBuilder::FlushTerms() {
FlushText();
int num_terms = terms_.length();
RegExpTree* alternative;
if (num_terms == 0) {
alternative = RegExpEmpty::GetInstance();
} else if (num_terms == 1) {
alternative = terms_.last();
} else {
alternative = new(zone()) RegExpAlternative(terms_.GetList(zone()));
}
alternatives_.Add(alternative, zone());
terms_.Clear();
LAST(ADD_NONE);
}
RegExpTree* RegExpBuilder::ToRegExp() {
FlushTerms();
int num_alternatives = alternatives_.length();
if (num_alternatives == 0) {
return RegExpEmpty::GetInstance();
}
if (num_alternatives == 1) {
return alternatives_.last();
}
return new(zone()) RegExpDisjunction(alternatives_.GetList(zone()));
}
void RegExpBuilder::AddQuantifierToAtom(
int min, int max, RegExpQuantifier::QuantifierType quantifier_type) {
if (pending_empty_) {
pending_empty_ = false;
return;
}
RegExpTree* atom;
if (characters_ != NULL) {
DCHECK(last_added_ == ADD_CHAR);
// Last atom was character.
Vector<const uc16> char_vector = characters_->ToConstVector();
int num_chars = char_vector.length();
if (num_chars > 1) {
Vector<const uc16> prefix = char_vector.SubVector(0, num_chars - 1);
text_.Add(new(zone()) RegExpAtom(prefix), zone());
char_vector = char_vector.SubVector(num_chars - 1, num_chars);
}
characters_ = NULL;
atom = new(zone()) RegExpAtom(char_vector);
FlushText();
} else if (text_.length() > 0) {
DCHECK(last_added_ == ADD_ATOM);
atom = text_.RemoveLast();
FlushText();
} else if (terms_.length() > 0) {
DCHECK(last_added_ == ADD_ATOM);
atom = terms_.RemoveLast();
if (atom->max_match() == 0) {
// Guaranteed to only match an empty string.
LAST(ADD_TERM);
if (min == 0) {
return;
}
terms_.Add(atom, zone());
return;
}
} else {
// Only call immediately after adding an atom or character!
UNREACHABLE();
return;
}
terms_.Add(
new(zone()) RegExpQuantifier(min, max, quantifier_type, atom), zone());
LAST(ADD_TERM);
}
// SNIP
// ----------------------------------------------------------------------------
// Regular expressions
RegExpParser::RegExpParser(FlatStringReader* in,
Handle<String>* error,
bool multiline,
Zone* zone)
: isolate_(zone->isolate()),
zone_(zone),
error_(error),
captures_(NULL),
in_(in),
current_(kEndMarker),
next_pos_(0),
capture_count_(0),
has_more_(true),
multiline_(multiline),
simple_(false),
contains_anchor_(false),
is_scanned_for_captures_(false),
failed_(false) {
Advance();
}
uc32 RegExpParser::Next() {
if (has_next()) {
return in()->Get(next_pos_);
} else {
return kEndMarker;
}
}
void RegExpParser::Advance() {
if (next_pos_ < in()->length()) {
StackLimitCheck check(isolate());
if (check.HasOverflowed()) {
ReportError(CStrVector(Isolate::kStackOverflowMessage));
} else if (zone()->excess_allocation()) {
ReportError(CStrVector("Regular expression too large"));
} else {
current_ = in()->Get(next_pos_);
next_pos_++;
}
} else {
current_ = kEndMarker;
has_more_ = false;
}
}
void RegExpParser::Reset(int pos) {
next_pos_ = pos;
has_more_ = (pos < in()->length());
Advance();
}
void RegExpParser::Advance(int dist) {
next_pos_ += dist - 1;
Advance();
}
bool RegExpParser::simple() {
return simple_;
}
RegExpTree* RegExpParser::ReportError(Vector<const char> message) {
failed_ = true;
*error_ = isolate()->factory()->NewStringFromAscii(message).ToHandleChecked();
// Zip to the end to make sure the no more input is read.
current_ = kEndMarker;
next_pos_ = in()->length();
return NULL;
}
// Pattern ::
// Disjunction
RegExpTree* RegExpParser::ParsePattern() {
RegExpTree* result = ParseDisjunction(CHECK_FAILED);
DCHECK(!has_more());
// If the result of parsing is a literal string atom, and it has the
// same length as the input, then the atom is identical to the input.
if (result->IsAtom() && result->AsAtom()->length() == in()->length()) {
simple_ = true;
}
return result;
}
// Disjunction ::
// Alternative
// Alternative | Disjunction
// Alternative ::
// [empty]
// Term Alternative
// Term ::
// Assertion
// Atom
// Atom Quantifier
RegExpTree* RegExpParser::ParseDisjunction() {
// Used to store current state while parsing subexpressions.
RegExpParserState initial_state(NULL, INITIAL, 0, zone());
RegExpParserState* stored_state = &initial_state;
// Cache the builder in a local variable for quick access.
RegExpBuilder* builder = initial_state.builder();
while (true) {
switch (current()) {
case kEndMarker:
if (stored_state->IsSubexpression()) {
// Inside a parenthesized group when hitting end of input.
ReportError(CStrVector("Unterminated group") CHECK_FAILED);
}
DCHECK_EQ(INITIAL, stored_state->group_type());
// Parsing completed successfully.
return builder->ToRegExp();
case ')': {
if (!stored_state->IsSubexpression()) {
ReportError(CStrVector("Unmatched ')'") CHECK_FAILED);
}
DCHECK_NE(INITIAL, stored_state->group_type());
Advance();
// End disjunction parsing and convert builder content to new single
// regexp atom.
RegExpTree* body = builder->ToRegExp();
int end_capture_index = captures_started();
int capture_index = stored_state->capture_index();
SubexpressionType group_type = stored_state->group_type();
// Restore previous state.
stored_state = stored_state->previous_state();
builder = stored_state->builder();
// Build result of subexpression.
if (group_type == CAPTURE) {
RegExpCapture* capture = new(zone()) RegExpCapture(body, capture_index);
captures_->at(capture_index - 1) = capture;
body = capture;
} else if (group_type != GROUPING) {
DCHECK(group_type == POSITIVE_LOOKAHEAD ||
group_type == NEGATIVE_LOOKAHEAD);
bool is_positive = (group_type == POSITIVE_LOOKAHEAD);
body = new(zone()) RegExpLookahead(body,
is_positive,
end_capture_index - capture_index,
capture_index);
}
builder->AddAtom(body);
// For compatability with JSC and ES3, we allow quantifiers after
// lookaheads, and break in all cases.
break;
}
case '|': {
Advance();
builder->NewAlternative();
continue;
}
case '*':
case '+':
case '?':
return ReportError(CStrVector("Nothing to repeat"));
case '^': {
Advance();
if (multiline_) {
builder->AddAssertion(
new(zone()) RegExpAssertion(RegExpAssertion::START_OF_LINE));
} else {
builder->AddAssertion(
new(zone()) RegExpAssertion(RegExpAssertion::START_OF_INPUT));
set_contains_anchor();
}
continue;
}
case '$': {
Advance();
RegExpAssertion::AssertionType assertion_type =
multiline_ ? RegExpAssertion::END_OF_LINE :
RegExpAssertion::END_OF_INPUT;
builder->AddAssertion(new(zone()) RegExpAssertion(assertion_type));
continue;
}
case '.': {
Advance();
// everything except \x0a, \x0d, \u2028 and \u2029
ZoneList<CharacterRange>* ranges =
new(zone()) ZoneList<CharacterRange>(2, zone());
CharacterRange::AddClassEscape('.', ranges, zone());
RegExpTree* atom = new(zone()) RegExpCharacterClass(ranges, false);
builder->AddAtom(atom);
break;
}
case '(': {
SubexpressionType subexpr_type = CAPTURE;
Advance();
if (current() == '?') {
switch (Next()) {
case ':':
subexpr_type = GROUPING;
break;
case '=':
subexpr_type = POSITIVE_LOOKAHEAD;
break;
case '!':
subexpr_type = NEGATIVE_LOOKAHEAD;
break;
default:
ReportError(CStrVector("Invalid group") CHECK_FAILED);
break;
}
Advance(2);
} else {
if (captures_ == NULL) {
captures_ = new(zone()) ZoneList<RegExpCapture*>(2, zone());
}
if (captures_started() >= kMaxCaptures) {
ReportError(CStrVector("Too many captures") CHECK_FAILED);
}
captures_->Add(NULL, zone());
}
// Store current state and begin new disjunction parsing.
stored_state = new(zone()) RegExpParserState(stored_state, subexpr_type,
captures_started(), zone());
builder = stored_state->builder();
continue;
}
case '[': {
RegExpTree* atom = ParseCharacterClass(CHECK_FAILED);
builder->AddAtom(atom);
break;
}
// Atom ::
// \ AtomEscape
case '\\':
switch (Next()) {
case kEndMarker:
return ReportError(CStrVector("\\ at end of pattern"));
case 'b':
Advance(2);
builder->AddAssertion(
new(zone()) RegExpAssertion(RegExpAssertion::BOUNDARY));
continue;
case 'B':
Advance(2);
builder->AddAssertion(
new(zone()) RegExpAssertion(RegExpAssertion::NON_BOUNDARY));
continue;
// AtomEscape ::
// CharacterClassEscape
//
// CharacterClassEscape :: one of
// d D s S w W
case 'd': case 'D': case 's': case 'S': case 'w': case 'W': {
uc32 c = Next();
Advance(2);
ZoneList<CharacterRange>* ranges =
new(zone()) ZoneList<CharacterRange>(2, zone());
CharacterRange::AddClassEscape(c, ranges, zone());
RegExpTree* atom = new(zone()) RegExpCharacterClass(ranges, false);
builder->AddAtom(atom);
break;
}
case '1': case '2': case '3': case '4': case '5': case '6':
case '7': case '8': case '9': {
int index = 0;
if (ParseBackReferenceIndex(&index)) {
RegExpCapture* capture = NULL;
if (captures_ != NULL && index <= captures_->length()) {
capture = captures_->at(index - 1);
}
if (capture == NULL) {
builder->AddEmpty();
break;
}
RegExpTree* atom = new(zone()) RegExpBackReference(capture);
builder->AddAtom(atom);
break;
}
uc32 first_digit = Next();
if (first_digit == '8' || first_digit == '9') {
// Treat as identity escape
builder->AddCharacter(first_digit);
Advance(2);
break;
}
}
// FALLTHROUGH
case '0': {
Advance();
uc32 octal = ParseOctalLiteral();
builder->AddCharacter(octal);
break;
}
// ControlEscape :: one of
// f n r t v
case 'f':
Advance(2);
builder->AddCharacter('\f');
break;
case 'n':
Advance(2);
builder->AddCharacter('\n');
break;
case 'r':
Advance(2);
builder->AddCharacter('\r');
break;
case 't':
Advance(2);
builder->AddCharacter('\t');
break;
case 'v':
Advance(2);
builder->AddCharacter('\v');
break;
case 'c': {
Advance();
uc32 controlLetter = Next();
// Special case if it is an ASCII letter.
// Convert lower case letters to uppercase.
uc32 letter = controlLetter & ~('a' ^ 'A');
if (letter < 'A' || 'Z' < letter) {
// controlLetter is not in range 'A'-'Z' or 'a'-'z'.
// This is outside the specification. We match JSC in
// reading the backslash as a literal character instead
// of as starting an escape.
builder->AddCharacter('\\');
} else {
Advance(2);
builder->AddCharacter(controlLetter & 0x1f);
}
break;
}
case 'x': {
Advance(2);
uc32 value;
if (ParseHexEscape(2, &value)) {
builder->AddCharacter(value);
} else {
builder->AddCharacter('x');
}
break;
}
case 'u': {
Advance(2);
uc32 value;
if (ParseHexEscape(4, &value)) {
builder->AddCharacter(value);
} else {
builder->AddCharacter('u');
}
break;
}
default:
// Identity escape.
builder->AddCharacter(Next());
Advance(2);
break;
}
break;
case '{': {
int dummy;
if (ParseIntervalQuantifier(&dummy, &dummy)) {
ReportError(CStrVector("Nothing to repeat") CHECK_FAILED);
}
// fallthrough
}
default:
builder->AddCharacter(current());
Advance();
break;
} // end switch(current())
int min;
int max;
switch (current()) {
// QuantifierPrefix ::
// *
// +
// ?
// {
case '*':
min = 0;
max = RegExpTree::kInfinity;
Advance();
break;
case '+':
min = 1;
max = RegExpTree::kInfinity;
Advance();
break;
case '?':
min = 0;
max = 1;
Advance();
break;
case '{':
if (ParseIntervalQuantifier(&min, &max)) {
if (max < min) {
ReportError(CStrVector("numbers out of order in {} quantifier.")
CHECK_FAILED);
}
break;
} else {
continue;
}
default:
continue;
}
RegExpQuantifier::QuantifierType quantifier_type = RegExpQuantifier::GREEDY;
if (current() == '?') {
quantifier_type = RegExpQuantifier::NON_GREEDY;
Advance();
} else if (FLAG_regexp_possessive_quantifier && current() == '+') {
// FLAG_regexp_possessive_quantifier is a debug-only flag.
quantifier_type = RegExpQuantifier::POSSESSIVE;
Advance();
}
builder->AddQuantifierToAtom(min, max, quantifier_type);
}
}
#ifdef DEBUG
// Currently only used in an DCHECK.
static bool IsSpecialClassEscape(uc32 c) {
switch (c) {
case 'd': case 'D':
case 's': case 'S':
case 'w': case 'W':
return true;
default:
return false;
}
}
#endif
// In order to know whether an escape is a backreference or not we have to scan
// the entire regexp and find the number of capturing parentheses. However we
// don't want to scan the regexp twice unless it is necessary. This mini-parser
// is called when needed. It can see the difference between capturing and
// noncapturing parentheses and can skip character classes and backslash-escaped
// characters.
void RegExpParser::ScanForCaptures() {
// Start with captures started previous to current position
int capture_count = captures_started();
// Add count of captures after this position.
int n;
while ((n = current()) != kEndMarker) {
Advance();
switch (n) {
case '\\':
Advance();
break;
case '[': {
int c;
while ((c = current()) != kEndMarker) {
Advance();
if (c == '\\') {
Advance();
} else {
if (c == ']') break;
}
}
break;
}
case '(':
if (current() != '?') capture_count++;
break;
}
}
capture_count_ = capture_count;
is_scanned_for_captures_ = true;
}
bool RegExpParser::ParseBackReferenceIndex(int* index_out) {
DCHECK_EQ('\\', current());
DCHECK('1' <= Next() && Next() <= '9');
// Try to parse a decimal literal that is no greater than the total number
// of left capturing parentheses in the input.
int start = position();
int value = Next() - '0';
Advance(2);
while (true) {
uc32 c = current();
if (IsDecimalDigit(c)) {
value = 10 * value + (c - '0');
if (value > kMaxCaptures) {
Reset(start);
return false;
}
Advance();
} else {
break;
}
}
if (value > captures_started()) {
if (!is_scanned_for_captures_) {
int saved_position = position();
ScanForCaptures();
Reset(saved_position);
}
if (value > capture_count_) {
Reset(start);
return false;
}
}
*index_out = value;
return true;
}
// QuantifierPrefix ::
// { DecimalDigits }
// { DecimalDigits , }
// { DecimalDigits , DecimalDigits }
//
// Returns true if parsing succeeds, and set the min_out and max_out
// values. Values are truncated to RegExpTree::kInfinity if they overflow.
bool RegExpParser::ParseIntervalQuantifier(int* min_out, int* max_out) {
DCHECK_EQ(current(), '{');
int start = position();
Advance();
int min = 0;
if (!IsDecimalDigit(current())) {
Reset(start);
return false;
}
while (IsDecimalDigit(current())) {
int next = current() - '0';
if (min > (RegExpTree::kInfinity - next) / 10) {
// Overflow. Skip past remaining decimal digits and return -1.
do {
Advance();
} while (IsDecimalDigit(current()));
min = RegExpTree::kInfinity;
break;
}
min = 10 * min + next;
Advance();
}
int max = 0;
if (current() == '}') {
max = min;
Advance();
} else if (current() == ',') {
Advance();
if (current() == '}') {
max = RegExpTree::kInfinity;
Advance();
} else {
while (IsDecimalDigit(current())) {
int next = current() - '0';
if (max > (RegExpTree::kInfinity - next) / 10) {
do {
Advance();
} while (IsDecimalDigit(current()));
max = RegExpTree::kInfinity;
break;
}
max = 10 * max + next;
Advance();
}
if (current() != '}') {
Reset(start);
return false;
}
Advance();
}
} else {
Reset(start);
return false;
}
*min_out = min;
*max_out = max;
return true;
}
uc32 RegExpParser::ParseOctalLiteral() {
DCHECK(('0' <= current() && current() <= '7') || current() == kEndMarker);
// For compatibility with some other browsers (not all), we parse
// up to three octal digits with a value below 256.
uc32 value = current() - '0';
Advance();
if ('0' <= current() && current() <= '7') {
value = value * 8 + current() - '0';
Advance();
if (value < 32 && '0' <= current() && current() <= '7') {
value = value * 8 + current() - '0';
Advance();
}
}
return value;
}
bool RegExpParser::ParseHexEscape(int length, uc32 *value) {
int start = position();
uc32 val = 0;
bool done = false;
for (int i = 0; !done; i++) {
uc32 c = current();
int d = HexValue(c);
if (d < 0) {
Reset(start);
return false;
}
val = val * 16 + d;
Advance();
if (i == length - 1) {
done = true;
}
}
*value = val;
return true;
}
uc32 RegExpParser::ParseClassCharacterEscape() {
DCHECK(current() == '\\');
DCHECK(has_next() && !IsSpecialClassEscape(Next()));
Advance();
switch (current()) {
case 'b':
Advance();
return '\b';
// ControlEscape :: one of
// f n r t v
case 'f':
Advance();
return '\f';
case 'n':
Advance();
return '\n';
case 'r':
Advance();
return '\r';
case 't':
Advance();
return '\t';
case 'v':
Advance();
return '\v';
case 'c': {
uc32 controlLetter = Next();
uc32 letter = controlLetter & ~('A' ^ 'a');
// For compatibility with JSC, inside a character class
// we also accept digits and underscore as control characters.
if ((controlLetter >= '0' && controlLetter <= '9') ||
controlLetter == '_' ||
(letter >= 'A' && letter <= 'Z')) {
Advance(2);
// Control letters mapped to ASCII control characters in the range
// 0x00-0x1f.
return controlLetter & 0x1f;
}
// We match JSC in reading the backslash as a literal
// character instead of as starting an escape.
return '\\';
}
case '0': case '1': case '2': case '3': case '4': case '5':
case '6': case '7':
// For compatibility, we interpret a decimal escape that isn't
// a back reference (and therefore either \0 or not valid according
// to the specification) as a 1..3 digit octal character code.
return ParseOctalLiteral();
case 'x': {
Advance();
uc32 value;
if (ParseHexEscape(2, &value)) {
return value;
}
// If \x is not followed by a two-digit hexadecimal, treat it
// as an identity escape.
return 'x';
}
case 'u': {
Advance();
uc32 value;
if (ParseHexEscape(4, &value)) {
return value;
}
// If \u is not followed by a four-digit hexadecimal, treat it
// as an identity escape.
return 'u';
}
default: {
// Extended identity escape. We accept any character that hasn't
// been matched by a more specific case, not just the subset required
// by the ECMAScript specification.
uc32 result = current();
Advance();
return result;
}
}
return 0;
}
CharacterRange RegExpParser::ParseClassAtom(uc16* char_class) {
DCHECK_EQ(0, *char_class);
uc32 first = current();
if (first == '\\') {
switch (Next()) {
case 'w': case 'W': case 'd': case 'D': case 's': case 'S': {
*char_class = Next();
Advance(2);
return CharacterRange::Singleton(0); // Return dummy value.
}
case kEndMarker:
return ReportError(CStrVector("\\ at end of pattern"));
default:
uc32 c = ParseClassCharacterEscape(CHECK_FAILED);
return CharacterRange::Singleton(c);
}
} else {
Advance();
return CharacterRange::Singleton(first);
}
}
static const uc16 kNoCharClass = 0;
// Adds range or pre-defined character class to character ranges.
// If char_class is not kInvalidClass, it's interpreted as a class
// escape (i.e., 's' means whitespace, from '\s').
static inline void AddRangeOrEscape(ZoneList<CharacterRange>* ranges,
uc16 char_class,
CharacterRange range,
Zone* zone) {
if (char_class != kNoCharClass) {
CharacterRange::AddClassEscape(char_class, ranges, zone);
} else {
ranges->Add(range, zone);
}
}
RegExpTree* RegExpParser::ParseCharacterClass() {
static const char* kUnterminated = "Unterminated character class";
static const char* kRangeOutOfOrder = "Range out of order in character class";
DCHECK_EQ(current(), '[');
Advance();
bool is_negated = false;
if (current() == '^') {
is_negated = true;
Advance();
}
ZoneList<CharacterRange>* ranges =
new(zone()) ZoneList<CharacterRange>(2, zone());
while (has_more() && current() != ']') {
uc16 char_class = kNoCharClass;
CharacterRange first = ParseClassAtom(&char_class CHECK_FAILED);
if (current() == '-') {
Advance();
if (current() == kEndMarker) {
// If we reach the end we break out of the loop and let the
// following code report an error.
break;
} else if (current() == ']') {
AddRangeOrEscape(ranges, char_class, first, zone());
ranges->Add(CharacterRange::Singleton('-'), zone());
break;
}
uc16 char_class_2 = kNoCharClass;
CharacterRange next = ParseClassAtom(&char_class_2 CHECK_FAILED);
if (char_class != kNoCharClass || char_class_2 != kNoCharClass) {
// Either end is an escaped character class. Treat the '-' verbatim.
AddRangeOrEscape(ranges, char_class, first, zone());
ranges->Add(CharacterRange::Singleton('-'), zone());
AddRangeOrEscape(ranges, char_class_2, next, zone());
continue;
}
if (first.from() > next.to()) {
return ReportError(CStrVector(kRangeOutOfOrder) CHECK_FAILED);
}
ranges->Add(CharacterRange::Range(first.from(), next.to()), zone());
} else {
AddRangeOrEscape(ranges, char_class, first, zone());
}
}
if (!has_more()) {
return ReportError(CStrVector(kUnterminated) CHECK_FAILED);
}
Advance();
if (ranges->length() == 0) {
ranges->Add(CharacterRange::Everything(), zone());
is_negated = !is_negated;
}
return new(zone()) RegExpCharacterClass(ranges, is_negated);
}
// ----------------------------------------------------------------------------
// The Parser interface.
bool RegExpParser::ParseRegExp(FlatStringReader* input,
bool multiline,
RegExpCompileData* result,
Zone* zone) {
DCHECK(result != NULL);
RegExpParser parser(input, &result->error, multiline, zone);
RegExpTree* tree = parser.ParsePattern();
if (parser.failed()) {
DCHECK(tree == NULL);
DCHECK(!result->error.is_null());
} else {
DCHECK(tree != NULL);
DCHECK(result->error.is_null());
result->tree = tree;
int capture_count = parser.captures_started();
result->simple = tree->IsAtom() && parser.simple() && capture_count == 0;
result->contains_anchor = parser.contains_anchor();
result->capture_count = capture_count;
}
return !parser.failed();
}
// SNIP
} // namespace dart
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