зеркало из https://github.com/mozilla/gecko-dev.git
357 строки
12 KiB
C++
357 строки
12 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* tokenization of CSS style sheets */
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#ifndef nsCSSScanner_h___
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#define nsCSSScanner_h___
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#include "nsString.h"
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namespace mozilla {
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namespace css {
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class ErrorReporter;
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}
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}
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// Token types; in close but not perfect correspondence to the token
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// categorization in section 4.1.1 of CSS2.1. (The deviations are all
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// the fault of css3-selectors, which has requirements that can only be
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// met by changing the generic tokenization.) The comment on each line
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// illustrates the form of each identifier.
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enum nsCSSTokenType {
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// White space of any kind. No value fields are used. Note that
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// comments do *not* count as white space; comments separate tokens
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// but are not themselves tokens.
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eCSSToken_Whitespace, //
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// Identifier-like tokens. mIdent is the text of the identifier.
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// The difference between ID and Hash is: if the text after the #
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// would have been a valid Ident if the # hadn't been there, the
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// scanner produces an ID token. Otherwise it produces a Hash token.
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// (This distinction is required by css3-selectors.)
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eCSSToken_Ident, // word
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eCSSToken_Function, // word(
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eCSSToken_AtKeyword, // @word
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eCSSToken_ID, // #word
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eCSSToken_Hash, // #0word
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// Numeric tokens. mNumber is the floating-point value of the
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// number, and mHasSign indicates whether there was an explicit sign
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// (+ or -) in front of the number. If mIntegerValid is true, the
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// number had the lexical form of an integer, and mInteger is its
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// integer value. Lexically integer values outside the range of a
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// 32-bit signed number are clamped to the maximum values; mNumber
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// will indicate a 'truer' value in that case. Percentage tokens
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// are always considered not to be integers, even if their numeric
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// value is integral (100% => mNumber = 1.0). For Dimension
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// tokens, mIdent holds the text of the unit.
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eCSSToken_Number, // 1 -5 +2e3 3.14159 7.297352e-3
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eCSSToken_Dimension, // 24px 8.5in
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eCSSToken_Percentage, // 85% 1280.4%
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// String-like tokens. In all cases, mIdent holds the text
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// belonging to the string, and mSymbol holds the delimiter
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// character, which may be ', ", or zero (only for unquoted URLs).
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// Bad_String and Bad_URL tokens are emitted when the closing
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// delimiter or parenthesis was missing.
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eCSSToken_String, // 'foo bar' "foo bar"
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eCSSToken_Bad_String, // 'foo bar
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eCSSToken_URL, // url(foobar) url("foo bar")
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eCSSToken_Bad_URL, // url(foo
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// Any one-character symbol. mSymbol holds the character.
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eCSSToken_Symbol, // . ; { } ! *
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// Match operators. These are single tokens rather than pairs of
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// Symbol tokens because css3-selectors forbids the presence of
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// comments between the two characters. No value fields are used;
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// the token type indicates which operator.
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eCSSToken_Includes, // ~=
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eCSSToken_Dashmatch, // |=
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eCSSToken_Beginsmatch, // ^=
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eCSSToken_Endsmatch, // $=
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eCSSToken_Containsmatch, // *=
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// Unicode-range token: currently used only in @font-face.
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// The lexical rule for this token includes several forms that are
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// semantically invalid. Therefore, mIdent always holds the
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// complete original text of the token (so we can print it
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// accurately in diagnostics), and mIntegerValid is true iff the
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// token is semantically valid. In that case, mInteger holds the
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// lowest value included in the range, and mInteger2 holds the
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// highest value included in the range.
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eCSSToken_URange, // U+007e U+01?? U+2000-206F
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// HTML comment delimiters, ignored as a unit when they appear at
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// the top level of a style sheet, for compatibility with websites
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// written for compatibility with pre-CSS browsers. This token type
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// subsumes the css2.1 CDO and CDC tokens, which are always treated
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// the same by the parser. mIdent holds the text of the token, for
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// diagnostics.
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eCSSToken_HTMLComment, // <!-- -->
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};
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// Classification of tokens used to determine if a "/**/" string must be
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// inserted if pasting token streams together when serializing. We include
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// values corresponding to eCSSToken_Dashmatch and eCSSToken_Containsmatch,
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// as css-syntax does not treat these as whole tokens, but we will still
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// need to insert a "/**/" string between a '|' delim and a '|=' dashmatch
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// and between a '/' delim and a '*=' containsmatch.
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//
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// https://dvcs.w3.org/hg/csswg/raw-file/372e659027a0/css-syntax/Overview.html#serialization
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enum nsCSSTokenSerializationType {
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eCSSTokenSerialization_Nothing,
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eCSSTokenSerialization_Whitespace,
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eCSSTokenSerialization_AtKeyword_or_Hash,
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eCSSTokenSerialization_Number,
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eCSSTokenSerialization_Dimension,
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eCSSTokenSerialization_Percentage,
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eCSSTokenSerialization_URange,
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eCSSTokenSerialization_URL_or_BadURL,
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eCSSTokenSerialization_Function,
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eCSSTokenSerialization_Ident,
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eCSSTokenSerialization_CDC,
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eCSSTokenSerialization_DashMatch,
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eCSSTokenSerialization_ContainsMatch,
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eCSSTokenSerialization_Symbol_Hash, // '#'
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eCSSTokenSerialization_Symbol_At, // '@'
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eCSSTokenSerialization_Symbol_Dot_or_Plus, // '.', '+'
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eCSSTokenSerialization_Symbol_Minus, // '-'
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eCSSTokenSerialization_Symbol_OpenParen, // '('
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eCSSTokenSerialization_Symbol_Question, // '?'
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eCSSTokenSerialization_Symbol_Assorted, // '$', '^', '~'
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eCSSTokenSerialization_Symbol_Equals, // '='
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eCSSTokenSerialization_Symbol_Bar, // '|'
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eCSSTokenSerialization_Symbol_Slash, // '/'
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eCSSTokenSerialization_Symbol_Asterisk, // '*'
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eCSSTokenSerialization_Other // anything else
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};
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// A single token returned from the scanner. mType is always
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// meaningful; comments above describe which other fields are
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// meaningful for which token types.
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struct nsCSSToken {
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nsAutoString mIdent;
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float mNumber;
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int32_t mInteger;
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int32_t mInteger2;
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nsCSSTokenType mType;
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char16_t mSymbol;
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bool mIntegerValid;
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bool mHasSign;
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nsCSSToken()
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: mNumber(0), mInteger(0), mInteger2(0), mType(eCSSToken_Whitespace),
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mSymbol('\0'), mIntegerValid(false), mHasSign(false)
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{}
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bool IsSymbol(char16_t aSymbol) const {
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return mType == eCSSToken_Symbol && mSymbol == aSymbol;
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}
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void AppendToString(nsString& aBuffer) const;
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};
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// Represents an nsCSSScanner's saved position in the input buffer.
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class nsCSSScannerPosition {
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friend class nsCSSScanner;
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public:
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nsCSSScannerPosition() : mInitialized(false) { }
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uint32_t LineNumber() {
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MOZ_ASSERT(mInitialized);
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return mLineNumber;
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}
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uint32_t LineOffset() {
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MOZ_ASSERT(mInitialized);
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return mLineOffset;
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}
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private:
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uint32_t mOffset;
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uint32_t mLineNumber;
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uint32_t mLineOffset;
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uint32_t mTokenLineNumber;
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uint32_t mTokenLineOffset;
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uint32_t mTokenOffset;
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bool mInitialized;
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};
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// nsCSSScanner tokenizes an input stream using the CSS2.1 forward
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// compatible tokenization rules. Used internally by nsCSSParser;
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// not available for use by other code.
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class nsCSSScanner {
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public:
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// |aLineNumber == 1| is the beginning of a file, use |aLineNumber == 0|
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// when the line number is unknown.
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nsCSSScanner(const nsAString& aBuffer, uint32_t aLineNumber);
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~nsCSSScanner();
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void SetErrorReporter(mozilla::css::ErrorReporter* aReporter) {
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mReporter = aReporter;
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}
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// Set whether or not we are processing SVG
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void SetSVGMode(bool aSVGMode) {
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mSVGMode = aSVGMode;
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}
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bool IsSVGMode() const {
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return mSVGMode;
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}
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// Reset or check whether a BAD_URL or BAD_STRING token has been seen.
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void ClearSeenBadToken() { mSeenBadToken = false; }
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bool SeenBadToken() const { return mSeenBadToken; }
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// Reset or check whether a "var(" FUNCTION token has been seen.
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void ClearSeenVariableReference() { mSeenVariableReference = false; }
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bool SeenVariableReference() const { return mSeenVariableReference; }
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// Get the 1-based line number of the last character of
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// the most recently processed token.
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uint32_t GetLineNumber() const { return mTokenLineNumber; }
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// Get the 0-based column number of the first character of
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// the most recently processed token.
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uint32_t GetColumnNumber() const
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{ return mTokenOffset - mTokenLineOffset; }
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// Get the text of the line containing the first character of
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// the most recently processed token.
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nsDependentSubstring GetCurrentLine() const;
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// Get the next token. Return false on EOF. aTokenResult is filled
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// in with the data for the token. If aSkipWS is true, skip over
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// eCSSToken_Whitespace tokens rather than returning them.
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bool Next(nsCSSToken& aTokenResult, bool aSkipWS);
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// Get the body of an URL token (everything after the 'url(').
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// This is exposed for use by nsCSSParser::ParseMozDocumentRule,
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// which, for historical reasons, must make additional function
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// tokens behave like url(). Please do not add new uses to the
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// parser.
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bool NextURL(nsCSSToken& aTokenResult);
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// This is exposed for use by nsCSSParser::ParsePseudoClassWithNthPairArg,
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// because "2n-1" is a single DIMENSION token, and "n-1" is a single
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// IDENT token, but the :nth() selector syntax wants to interpret
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// them the same as "2n -1" and "n -1" respectively. Please do not
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// add new uses to the parser.
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//
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// Note: this function may not be used to back up over a line boundary.
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void Backup(uint32_t n);
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// Starts recording the input stream from the current position.
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void StartRecording();
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// Abandons recording of the input stream.
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void StopRecording();
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// Stops recording of the input stream and appends the recorded
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// input to aBuffer.
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void StopRecording(nsString& aBuffer);
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// Returns the length of the current recording.
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uint32_t RecordingLength() const;
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#ifdef DEBUG
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bool IsRecording() const;
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#endif
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// Stores the current scanner offset into the specified object.
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void SavePosition(nsCSSScannerPosition& aState);
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// Resets the scanner offset to a position saved by SavePosition.
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void RestoreSavedPosition(const nsCSSScannerPosition& aState);
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enum EOFCharacters {
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eEOFCharacters_None = 0x0000,
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// to handle \<EOF> inside strings
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eEOFCharacters_DropBackslash = 0x0001,
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// to handle \<EOF> outside strings
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eEOFCharacters_ReplacementChar = 0x0002,
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// to close comments
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eEOFCharacters_Asterisk = 0x0004,
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eEOFCharacters_Slash = 0x0008,
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// to close double-quoted strings
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eEOFCharacters_DoubleQuote = 0x0010,
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// to close single-quoted strings
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eEOFCharacters_SingleQuote = 0x0020,
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// to close URLs
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eEOFCharacters_CloseParen = 0x0040,
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};
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// Appends any characters to the specified string the input stream to make the
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// last token not rely on special EOF handling behavior.
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//
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// If eEOFCharacters_DropBackslash is in aEOFCharacters, it is ignored.
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static void AppendImpliedEOFCharacters(EOFCharacters aEOFCharacters,
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nsAString& aString);
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EOFCharacters GetEOFCharacters() const {
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#ifdef DEBUG
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AssertEOFCharactersValid(mEOFCharacters);
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#endif
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return mEOFCharacters;
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}
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#ifdef DEBUG
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static void AssertEOFCharactersValid(uint32_t c);
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#endif
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protected:
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int32_t Peek(uint32_t n = 0);
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void Advance(uint32_t n = 1);
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void AdvanceLine();
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void SkipWhitespace();
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void SkipComment();
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bool GatherEscape(nsString& aOutput, bool aInString);
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bool GatherText(uint8_t aClass, nsString& aIdent);
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bool ScanIdent(nsCSSToken& aResult);
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bool ScanAtKeyword(nsCSSToken& aResult);
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bool ScanHash(nsCSSToken& aResult);
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bool ScanNumber(nsCSSToken& aResult);
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bool ScanString(nsCSSToken& aResult);
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bool ScanURange(nsCSSToken& aResult);
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void SetEOFCharacters(uint32_t aEOFCharacters);
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void AddEOFCharacters(uint32_t aEOFCharacters);
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const char16_t *mBuffer;
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uint32_t mOffset;
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uint32_t mCount;
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uint32_t mLineNumber;
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uint32_t mLineOffset;
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uint32_t mTokenLineNumber;
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uint32_t mTokenLineOffset;
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uint32_t mTokenOffset;
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uint32_t mRecordStartOffset;
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EOFCharacters mEOFCharacters;
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mozilla::css::ErrorReporter *mReporter;
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// True if we are in SVG mode; false in "normal" CSS
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bool mSVGMode;
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bool mRecording;
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bool mSeenBadToken;
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bool mSeenVariableReference;
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};
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#endif /* nsCSSScanner_h___ */
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