@@ -17,6 +17,43 @@ import 'package:sass/src/ast/node.dart';
1717import 'io.dart' ;
1818import 'patch.dart' ;
1919
20+ extension ExtendSpan on FileSpan {
21+ /// Extends this span so it encompasses any whitespace on either side of it.
22+ FileSpan extendThroughWhitespace () {
23+ var text = file.getText (0 );
24+
25+ var newStart = start.offset - 1 ;
26+ for (; newStart >= 0 ; newStart-- ) {
27+ if (! isWhitespace (text.codeUnitAt (newStart))) break ;
28+ }
29+
30+ var newEnd = end.offset;
31+ for (; newEnd < text.length; newEnd++ ) {
32+ if (! isWhitespace (text.codeUnitAt (newEnd))) break ;
33+ }
34+
35+ // Add 1 to start because it's guaranteed to end on either -1 or a character
36+ // that's not whitespace.
37+ return file.span (newStart + 1 , newEnd);
38+ }
39+
40+ /// Extends this span forward if it's followed by exactly [pattern] .
41+ ///
42+ /// If it doesn't match, returns the span as-is.
43+ FileSpan extendIfMatches (Pattern pattern) {
44+ var text = file.getText (end.offset);
45+ var match = pattern.matchAsPrefix (text);
46+ if (match == null ) return this ;
47+ return file.span (start.offset, end.offset + match.end);
48+ }
49+
50+ /// Returns true if this span is preceded by exactly [text] .
51+ bool matchesBefore (String text) {
52+ if (start.offset - text.length < 0 ) return false ;
53+ return file.getText (start.offset - text.length, start.offset) == text;
54+ }
55+ }
56+
2057/// Returns the default namespace for a use rule with [path] .
2158String namespaceForPath (String path) {
2259 // TODO(jathak): Confirm that this is a valid Sass identifier
@@ -41,40 +78,7 @@ bool valuesAreUnique(Map<Object, Object> map) =>
4178/// By default, this deletes the entire span. If [start] and/or [end] are
4279/// provided, this deletes only the portion of the span within that range.
4380Patch patchDelete (FileSpan span, {int start = 0 , int end}) =>
44- Patch (subspan (span, start: start, end: end), "" );
45-
46- /// Returns a subsection of [span] .
47- FileSpan subspan (FileSpan span, {int start = 0 , int end}) => span.file
48- .span (span.start.offset + start, span.start.offset + (end ?? span.length));
49-
50- /// Extends [span] so it encompasses any whitespace on either side of it.
51- FileSpan extendThroughWhitespace (FileSpan span) {
52- var text = span.file.getText (0 );
53-
54- var start = span.start.offset - 1 ;
55- for (; start >= 0 ; start-- ) {
56- if (! isWhitespace (text.codeUnitAt (start))) break ;
57- }
58-
59- var end = span.end.offset;
60- for (; end < text.length; end++ ) {
61- if (! isWhitespace (text.codeUnitAt (end))) break ;
62- }
63-
64- // Add 1 to start because it's guaranteed to end on either -1 or a character
65- // that's not whitespace.
66- return span.file.span (start + 1 , end);
67- }
68-
69- /// Extends [span] forward if it's followed by exactly [text] .
70- ///
71- /// If [span] is followed by anything other than [text] , returns `null` .
72- FileSpan extendForward (FileSpan span, String text) {
73- var end = span.end.offset;
74- if (end + text.length > span.file.length) return null ;
75- if (span.file.getText (end, end + text.length) != text) return null ;
76- return span.file.span (span.start.offset, end + text.length);
77- }
81+ Patch (span.subspan (start, end), "" );
7882
7983/// Returns the next location after [import] that it would be safe to insert
8084/// a `@use` or `@forward` rule.
@@ -117,23 +121,6 @@ FileLocation afterImport(ImportRule import, {bool shouldHaveSemicolon = true}) {
117121 return loc.file.location (loc.offset + i);
118122}
119123
120- /// Extends [span] backward if it's preceded by exactly [text] .
121- ///
122- /// If [span] is preceded by anything other than [text] , returns `null` .
123- FileSpan extendBackward (FileSpan span, String text) {
124- var start = span.start.offset;
125- if (start - text.length < 0 ) return null ;
126- if (span.file.getText (start - text.length, start) != text) return null ;
127- return span.file.span (start - text.length, span.end.offset);
128- }
129-
130- /// Returns true if [span] is preceded by exactly [text] .
131- bool matchesBeforeSpan (FileSpan span, String text) {
132- var start = span.start.offset;
133- if (start - text.length < 0 ) return false ;
134- return span.file.getText (start - text.length, start) == text;
135- }
136-
137124/// Returns whether [character] is whitespace, according to Sass's definition.
138125bool isWhitespace (int character) =>
139126 character == $space ||
@@ -149,30 +136,27 @@ bool isWhitespace(int character) =>
149136FileSpan nameSpan (SassNode node) {
150137 if (node is VariableDeclaration ) {
151138 var start = node.namespace == null ? 1 : node.namespace.length + 2 ;
152- return subspan ( node.span, start: start, end : start + node.name.length);
139+ return node.span. subspan ( start, start + node.name.length);
153140 } else if (node is VariableExpression ) {
154- return subspan ( node.span,
155- start : node.namespace == null ? 1 : node.namespace.length + 2 );
141+ return node.span
142+ . subspan ( node.namespace == null ? 1 : node.namespace.length + 2 );
156143 } else if (node is FunctionRule ) {
157144 var startName = node.span.text
158145 .replaceAll ('_' , '-' )
159146 .indexOf (node.name, '@function' .length);
160- return subspan (node.span,
161- start: startName, end: startName + node.name.length);
147+ return node.span.subspan (startName, startName + node.name.length);
162148 } else if (node is FunctionExpression ) {
163149 return node.name.span;
164150 } else if (node is MixinRule ) {
165151 var startName = node.span.text
166152 .replaceAll ('_' , '-' )
167153 .indexOf (node.name, node.span.text[0 ] == '=' ? 1 : '@mixin' .length);
168- return subspan (node.span,
169- start: startName, end: startName + node.name.length);
154+ return node.span.subspan (startName, startName + node.name.length);
170155 } else if (node is IncludeRule ) {
171156 var startName = node.span.text
172157 .replaceAll ('_' , '-' )
173158 .indexOf (node.name, node.span.text[0 ] == '+' ? 1 : '@include' .length);
174- return subspan (node.span,
175- start: startName, end: startName + node.name.length);
159+ return node.span.subspan (startName, startName + node.name.length);
176160 } else {
177161 throw UnsupportedError (
178162 "$node of type ${node .runtimeType } doesn't have a name" );
@@ -213,7 +197,7 @@ FileSpan getStaticNameForGetFunctionCall(FunctionExpression node) {
213197 return null ;
214198 }
215199 return (nameArgument as StringExpression ).hasQuotes
216- ? subspan ( nameArgument.span, start : 1 , end : nameArgument.span.length - 1 )
200+ ? nameArgument.span. subspan ( 1 , nameArgument.span.length - 1 )
217201 : nameArgument.span;
218202}
219203
@@ -232,7 +216,7 @@ FileSpan getStaticModuleForGetFunctionCall(FunctionExpression node) {
232216 return null ;
233217 }
234218 return (moduleArg as StringExpression ).hasQuotes
235- ? subspan ( moduleArg.span, start : 1 , end : moduleArg.span.length - 2 )
219+ ? moduleArg.span. subspan ( 1 , moduleArg.span.length - 2 )
236220 : moduleArg.span;
237221}
238222
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