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scss.dart
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scss.dart
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// Copyright 2016 Google Inc. Use of this source code is governed by an
// MIT-style license that can be found in the LICENSE file or at
// https://opensource.org/licenses/MIT.
import 'package:charcode/charcode.dart';
import '../ast/sass.dart';
import '../interpolation_buffer.dart';
import '../logger.dart';
import '../util/character.dart';
import 'stylesheet.dart';
/// A parser for the CSS-compatible syntax.
class ScssParser extends StylesheetParser {
bool get indented => false;
int get currentIndentation => null;
ScssParser(String contents, {Object url, Logger logger})
: super(contents, url: url, logger: logger);
Interpolation styleRuleSelector() => almostAnyValue();
void expectStatementSeparator([String name]) {
whitespaceWithoutComments();
if (scanner.isDone) return;
var next = scanner.peekChar();
if (next == $semicolon || next == $rbrace) return;
scanner.expectChar($semicolon);
}
bool atEndOfStatement() {
var next = scanner.peekChar();
return next == null ||
next == $semicolon ||
next == $rbrace ||
next == $lbrace;
}
bool lookingAtChildren() => scanner.peekChar() == $lbrace;
bool scanElse(int _) {
var start = scanner.state;
whitespace();
var beforeAt = scanner.state;
if (scanner.scanChar($at)) {
if (scanIdentifier('else', caseSensitive: true)) return true;
if (scanIdentifier('elseif', caseSensitive: true)) {
logger.warn(
'@elseif is deprecated and will not be supported in future Sass '
'versions.\n'
'Use "@else if" instead.',
span: scanner.spanFrom(beforeAt),
deprecation: true);
scanner.position -= 2;
return true;
}
}
scanner.state = start;
return false;
}
List<Statement> children(Statement child()) {
scanner.expectChar($lbrace);
whitespaceWithoutComments();
var children = <Statement>[];
while (true) {
switch (scanner.peekChar()) {
case $dollar:
children.add(variableDeclarationWithoutNamespace());
break;
case $slash:
switch (scanner.peekChar(1)) {
case $slash:
children.add(_silentComment());
whitespaceWithoutComments();
break;
case $asterisk:
children.add(_loudComment());
whitespaceWithoutComments();
break;
default:
children.add(child());
break;
}
break;
case $semicolon:
scanner.readChar();
whitespaceWithoutComments();
break;
case $rbrace:
scanner.expectChar($rbrace);
return children;
default:
children.add(child());
break;
}
}
}
List<Statement> statements(Statement statement()) {
var statements = <Statement>[];
whitespaceWithoutComments();
while (!scanner.isDone) {
switch (scanner.peekChar()) {
case $dollar:
statements.add(variableDeclarationWithoutNamespace());
break;
case $slash:
switch (scanner.peekChar(1)) {
case $slash:
statements.add(_silentComment());
whitespaceWithoutComments();
break;
case $asterisk:
statements.add(_loudComment());
whitespaceWithoutComments();
break;
default:
var child = statement();
if (child != null) statements.add(child);
break;
}
break;
case $semicolon:
scanner.readChar();
whitespaceWithoutComments();
break;
default:
var child = statement();
if (child != null) statements.add(child);
break;
}
}
return statements;
}
/// Consumes a statement-level silent comment block.
SilentComment _silentComment() {
var start = scanner.state;
scanner.expect("//");
do {
while (!scanner.isDone && !isNewline(scanner.readChar())) {}
if (scanner.isDone) break;
whitespaceWithoutComments();
} while (scanner.scan("//"));
if (plainCss) {
error("Silent comments aren't allowed in plain CSS.",
scanner.spanFrom(start));
}
lastSilentComment = SilentComment(
scanner.substring(start.position), scanner.spanFrom(start));
return lastSilentComment;
}
/// Consumes a statement-level loud comment block.
LoudComment _loudComment() {
var start = scanner.state;
scanner.expect("/*");
var buffer = InterpolationBuffer()..write("/*");
while (true) {
switch (scanner.peekChar()) {
case $hash:
if (scanner.peekChar(1) == $lbrace) {
buffer.add(singleInterpolation());
} else {
buffer.writeCharCode(scanner.readChar());
}
break;
case $asterisk:
buffer.writeCharCode(scanner.readChar());
if (scanner.peekChar() != $slash) break;
buffer.writeCharCode(scanner.readChar());
return LoudComment(buffer.interpolation(scanner.spanFrom(start)));
case $cr:
scanner.readChar();
if (scanner.peekChar() != $lf) buffer.writeCharCode($lf);
break;
case $ff:
scanner.readChar();
buffer.writeCharCode($lf);
break;
default:
buffer.writeCharCode(scanner.readChar());
break;
}
}
}
}