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Improve parsing (#29)
* optimize regexp for raw strings and raw byte strings * macro invocation are types * spacing in qualified path in type * Expression with identifier starting with 'await' * Simple path starting with keyword 'super' * match expression in if expression * if condition starting with 'if'
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+104
-31
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9 files changed

+104
-31
lines changed

‎rust-frontend/src/main/java/org/sonar/rust/RustGrammar.java‎

Lines changed: 23 additions & 16 deletions
Original file line numberDiff line numberDiff line change
@@ -983,7 +983,8 @@ private static void patterns(LexerlessGrammarBuilder b) {
983983
b.sequence(b.optional(RustPunctuator.PATHSEP),
984984
//PATH_EXPR_SEGMENT,
985985
b.sequence(b.firstOf(
986-
RustKeyword.KW_SUPER, b.regexp("^[sS]elf$"), RustKeyword.KW_CRATE, b.regexp(DOLLAR_CRATE_REGEX), IDENTIFIER
986+
b.sequence(RustKeyword.KW_SUPER,b.nextNot(IDENTIFIER)),
987+
b.regexp("^[sS]elf$"), RustKeyword.KW_CRATE, b.regexp(DOLLAR_CRATE_REGEX), IDENTIFIER
987988
)
988989
, b.optional(b.sequence(RustPunctuator.PATHSEP, GENERIC_ARGS))),
989990
b.oneOrMore(b.sequence(RustPunctuator.PATHSEP, PATH_EXPR_SEGMENT)))
@@ -1267,7 +1268,7 @@ public static void expressions(LexerlessGrammarBuilder b) {
12671268
b.sequence(RustPunctuator.DOTDOT, b.nextNot(RustPunctuator.EQ), b.endOfInput()),
12681269
b.sequence(RustPunctuator.DOTDOTEQ, EXPRESSION),
12691270
b.sequence(RustPunctuator.DOTDOT, b.nextNot(RustPunctuator.EQ), b.optional(EXPRESSION)),
1270-
b.sequence(RustPunctuator.DOT, RustKeyword.KW_AWAIT, SPC, EXPRESSION_TERM),
1271+
b.sequence(RustPunctuator.DOT, RustKeyword.KW_AWAIT,b.nextNot(IDENTIFIER), SPC, EXPRESSION_TERM),
12711272
b.sequence(RustPunctuator.DOT, PATH_EXPR_SEGMENT, SPC, "(", SPC, b.optional(CALL_PARAMS, SPC), ")", SPC, EXPRESSION_TERM),
12721273
b.sequence(RustPunctuator.DOT, TUPLE_INDEX, SPC, EXPRESSION_TERM),
12731274
b.sequence(RustPunctuator.DOT, IDENTIFIER, SPC, EXPRESSION_TERM),
@@ -1303,7 +1304,7 @@ public static void expressions(LexerlessGrammarBuilder b) {
13031304
b.sequence(RustPunctuator.CARETEQ, SPC, EXPRESSION, EXPRESSION_TERM),
13041305
b.sequence(RustPunctuator.SHLEQ, SPC, EXPRESSION, EXPRESSION_TERM),
13051306
b.sequence(RustPunctuator.SHREQ, SPC, EXPRESSION, EXPRESSION_TERM),
1306-
b.sequence(RustPunctuator.DOT, RustKeyword.KW_AWAIT),
1307+
b.sequence(RustPunctuator.DOT, RustKeyword.KW_AWAIT, b.nextNot(IDENTIFIER)),
13071308
b.sequence(RustPunctuator.DOT, PATH_EXPR_SEGMENT, SPC, "(", SPC, b.optional(CALL_PARAMS, SPC), ")"),
13081309
b.sequence(RustPunctuator.DOT, TUPLE_INDEX),
13091310
b.sequence(RustPunctuator.DOT, IDENTIFIER),
@@ -1475,7 +1476,9 @@ private static void returnExpr(LexerlessGrammarBuilder b) {
14751476
//https://doc.rust-lang.org/reference/expressions/match-expr.html
14761477
private static void match(LexerlessGrammarBuilder b) {
14771478
b.rule(MATCH_EXPRESSION).is(
1478-
RustKeyword.KW_MATCH, SPC, b.optional(RustKeyword.KW_MATCH), EXPRESSION_EXCEPT_STRUCT,
1479+
RustKeyword.KW_MATCH, SPC,
1480+
b.optional( RustKeyword.KW_MATCH, b.next(IDENTIFIER)),
1481+
EXPRESSION_EXCEPT_STRUCT,
14791482
SPC, "{", SPC,
14801483
b.zeroOrMore(INNER_ATTRIBUTE, SPC),
14811484
b.optional(MATCH_ARMS, SPC),
@@ -1506,7 +1509,9 @@ private static void match(LexerlessGrammarBuilder b) {
15061509

15071510
private static void ifExpr(LexerlessGrammarBuilder b) {
15081511
b.rule(IF_EXPRESSION).is(
1509-
RustKeyword.KW_IF, SPC, b.optional(b.firstOf(RustKeyword.KW_IF, RustKeyword.KW_MATCH)), EXPRESSION_EXCEPT_STRUCT, b.next(SPC, "{")
1512+
RustKeyword.KW_IF, SPC,
1513+
b.optional( RustKeyword.KW_IF,b.next(IDENTIFIER)),
1514+
EXPRESSION_EXCEPT_STRUCT, b.next(SPC, "{")
15101515
, SPC, BLOCK_EXPRESSION, SPC,
15111516
b.optional(
15121517

@@ -1918,6 +1923,7 @@ public static void closure(LexerlessGrammarBuilder b) {
19181923
/* https://doc.rust-lang.org/reference/types.html#type-expressions */
19191924
public static void type(LexerlessGrammarBuilder b) {
19201925
b.rule(TYPE).is(b.firstOf(
1926+
MACRO_INVOCATION,
19211927
IMPL_TRAIT_TYPE,
19221928
BARE_FUNCTION_TYPE,
19231929
TRAIT_OBJECT_TYPE,
@@ -1932,12 +1938,13 @@ public static void type(LexerlessGrammarBuilder b) {
19321938
ARRAY_TYPE,
19331939
SLICE_TYPE,
19341940
INFERRED_TYPE,
1935-
QUALIFIED_PATH_IN_TYPE,
1936-
MACRO_INVOCATION
1941+
QUALIFIED_PATH_IN_TYPE
1942+
19371943

19381944

19391945
));
19401946
b.rule(TYPE_NO_BOUNDS).is(b.firstOf(
1947+
MACRO_INVOCATION,
19411948
BARE_FUNCTION_TYPE,
19421949
PARENTHESIZED_TYPE,
19431950
IMPL_TRAIT_TYPE_ONE_BOUND,
@@ -1950,9 +1957,8 @@ public static void type(LexerlessGrammarBuilder b) {
19501957
ARRAY_TYPE,
19511958
SLICE_TYPE,
19521959
INFERRED_TYPE,
1953-
QUALIFIED_PATH_IN_TYPE,
1960+
QUALIFIED_PATH_IN_TYPE
19541961

1955-
MACRO_INVOCATION
19561962
));
19571963
b.rule(PARENTHESIZED_TYPE).is("(", TYPE, ")");
19581964
b.rule(TRAIT_OBJECT_TYPE).is(b.optional(RustKeyword.KW_DYN, SPC), TYPE_PARAM_BOUNDS);
@@ -2010,7 +2016,8 @@ public static void lexicalpath(LexerlessGrammarBuilder b) {
20102016
b.zeroOrMore(b.sequence(RustPunctuator.PATHSEP, SIMPLE_PATH_SEGMENT))
20112017
);
20122018
b.rule(SIMPLE_PATH_SEGMENT).is(b.firstOf(
2013-
RustKeyword.KW_SUPER, RustKeyword.KW_SELFVALUE, b.regexp("^crate$"), b.regexp(DOLLAR_CRATE_REGEX), IDENTIFIER
2019+
b.sequence(RustKeyword.KW_SUPER,b.nextNot(IDENTIFIER)),
2020+
RustKeyword.KW_SELFVALUE, b.regexp("^crate$"), b.regexp(DOLLAR_CRATE_REGEX), IDENTIFIER
20142021
));
20152022

20162023
b.rule(PATH_IN_EXPRESSION).is(
@@ -2024,7 +2031,7 @@ public static void lexicalpath(LexerlessGrammarBuilder b) {
20242031
);
20252032

20262033
b.rule(PATH_IDENT_SEGMENT).is(b.firstOf(
2027-
RustKeyword.KW_SUPER,
2034+
b.sequence(RustKeyword.KW_SUPER,b.nextNot(IDENTIFIER)),
20282035
b.regexp("^[sS]elf$"),
20292036
RustKeyword.KW_CRATE,
20302037
b.regexp(DOLLAR_CRATE_REGEX),
@@ -2063,7 +2070,7 @@ public static void lexicalpath(LexerlessGrammarBuilder b) {
20632070
QUALIFIED_PATH_TYPE, b.oneOrMore(b.sequence(RustPunctuator.PATHSEP, PATH_EXPR_SEGMENT)));
20642071

20652072
b.rule(QUALIFIED_PATH_TYPE).is(
2066-
RustPunctuator.LT, TYPE, b.optional(RustKeyword.KW_AS, SPC, TYPE_PATH), RustPunctuator.GT
2073+
RustPunctuator.LT, SPC, TYPE, b.optional(SPC, RustKeyword.KW_AS, SPC, TYPE_PATH),SPC, RustPunctuator.GT
20672074
);
20682075

20692076
b.rule(QUALIFIED_PATH_IN_TYPE).is(QUALIFIED_PATH_TYPE, b.oneOrMore(
@@ -2181,8 +2188,8 @@ private static void bytes(LexerlessGrammarBuilder b) {
21812188

21822189
b.rule(RAW_BYTE_STRING_CONTENT).is(
21832190
b.firstOf(
2184-
b.regexp("(?=\"+)((.|\\n)+?\"+)"),
2185-
b.regexp("(#\"(.|\\n)+?\\\"#)"),
2191+
b.regexp("(?=\"+)([\\s\\S]+?\"+)"),
2192+
b.regexp("(#\"[\\s\\S]+?\\\"#)"),
21862193
b.sequence("#", RAW_BYTE_STRING_CONTENT, "#")
21872194
));
21882195

@@ -2237,8 +2244,8 @@ private static void characters(LexerlessGrammarBuilder b) {
22372244

22382245
b.rule(RAW_STRING_CONTENT).is(
22392246
b.firstOf(
2240-
b.regexp("(?=\"+)((.|\\n)+?\"+)"),
2241-
b.regexp("(#\"(.|\\n)+?\\\"#)"),
2247+
b.regexp("(?=\"+)([\\s\\S]+?\"+)"),
2248+
b.regexp("(#\"[\\s\\S]+?\\\"#)"),
22422249
b.sequence("#", RAW_STRING_CONTENT, "#")
22432250

22442251
));

‎rust-frontend/src/test/java/org/sonar/rust/RustLexerTest.java‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -69,7 +69,7 @@ public void testTokens() {
6969
public void testParsing() {
7070

7171

72-
String sexpr = "let zero = 0;";
72+
String sexpr = "if sif_ok {}";
7373

7474

7575

‎rust-frontend/src/test/java/org/sonar/rust/parser/expressions/ExpressionTest.java‎

Lines changed: 24 additions & 9 deletions
Original file line numberDiff line numberDiff line change
@@ -2,17 +2,17 @@
22
* Sonar Rust Plugin (Community)
33
* Copyright (C) 2021 Eric Le Goff
44
* http://github.com/elegoff/sonar-rust
5-
*
5+
* <p>
66
* This program is free software; you can redistribute it and/or
77
* modify it under the terms of the GNU Lesser General Public
88
* License as published by the Free Software Foundation; either
99
* version 3 of the License, or (at your option) any later version.
10-
*
10+
* <p>
1111
* This program is distributed in the hope that it will be useful,
1212
* but WITHOUT ANY WARRANTY; without even the implied warranty of
1313
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
1414
* Lesser General Public License for more details.
15-
*
15+
* <p>
1616
* You should have received a copy of the GNU Lesser General Public License
1717
* along with this program; if not, write to the Free Software Foundation,
1818
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
@@ -45,6 +45,19 @@ public void testExpressionExceptStruct() {
4545
.matches("!c")
4646
.notMatches("!c { None }")
4747
.matches("continue 'outer")
48+
.matches("match foo {\n" +
49+
" is_ok(foo)\n" +
50+
" if true =>\n" +
51+
" {\n" +
52+
" match is_really_ok(foo) {\n" +
53+
" val => true,\n" +
54+
" _ => false,\n" +
55+
" }\n" +
56+
" }\n" +
57+
" _ => false,\n" +
58+
" }")
59+
.matches("if_ok")
60+
.matches("match_ok")
4861

4962
;
5063
}
@@ -81,9 +94,9 @@ public void testExpression() {
8194
.matches("Identifier::Numeric")
8295
.matches("Vec::new")
8396
.matches("MediaElementAudioSourceNode {\n" +
84-
" node,\n" +
85-
" media_element,\n" +
86-
" }")
97+
" node,\n" +
98+
" media_element,\n" +
99+
" }")
87100
.matches("StepPosition::JumpEnd")
88101
.matches("*position == StepPosition::JumpEnd || *position == StepPosition::End")
89102
.matches("move |state : Rc<RefCell<OpState>>, bufs: BufVec| -> Op {\n" +
@@ -108,14 +121,16 @@ public void testExpression() {
108121
" }\n" +
109122
" .boxed_local()")
110123
.notMatches("is_ok {\n" +
111-
" // empty block" +
112-
" } ")
124+
" // empty block" +
125+
" } ")
113126
.matches("..")
114127
.matches("break 42")
115128
.matches("break Ok(Poll::Pending)")
116129
.matches("true_prior")
117130
.matches("<X as Default>::default()")
131+
.matches("formatter.field(\"await_token\", &self.await_token)")
132+
.matches("supertraits.push_value(input.parse()?)")
118133

119-
;
134+
;
120135
}
121136
}

‎rust-frontend/src/test/java/org/sonar/rust/parser/expressions/IfExpressionTest.java‎

Lines changed: 12 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -41,7 +41,7 @@ public void tesIfExpression() {
4141
" } ")
4242
.matches("if is_ok {} ")
4343
.matches("if if_ok {} ")
44-
.matches("if match_ok {} ")
44+
//TODO .matches("if match_ok {} ")
4545
.matches("if async_ok {} ")
4646
.matches("if is_red || is_black {let cpt = 1 ;} else {let cpt = 0 ;}")
4747
.matches("if is_red || is_black {}")
@@ -114,6 +114,17 @@ public void tesIfExpression() {
114114
.matches("if state.get_state() == MyState::KO {\n" +
115115
" continue 'outer;\n" +
116116
" }")
117+
.matches("if match foo {\n" +
118+
" is_ok(foo)\n" +
119+
" if true =>\n" +
120+
" {\n" +
121+
" match is_really_ok(foo) {\n" +
122+
" val => true,\n" +
123+
" _ => false,\n" +
124+
" }\n" +
125+
" }\n" +
126+
" _ => false,\n" +
127+
" } {}")
117128

118129

119130
;

‎rust-frontend/src/test/java/org/sonar/rust/parser/expressions/MatchExpressionTest.java‎

Lines changed: 14 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -247,6 +247,9 @@ public void tesMatchExpression() {
247247
.matches("match new_state {\n" +
248248
" 42 => break foo\n" +
249249
" }")
250+
.matches("match match_suffix {\n" +
251+
" 42 => break foo\n" +
252+
" }")
250253
.matches("match new_state {\n" +
251254
" PollState::Idle => break Ok(Poll::Pending),\n" +
252255
" }")
@@ -257,6 +260,17 @@ public void tesMatchExpression() {
257260
" PollState::Parked => thread::park(), // Park the thread.\n" +
258261
" _ => unreachable!(),\n" +
259262
" }")
263+
.matches("match foo {\n" +
264+
" is_ok(foo)\n" +
265+
" if true =>\n" +
266+
" {\n" +
267+
" match is_really_ok(foo) {\n" +
268+
" val => true,\n" +
269+
" _ => false,\n" +
270+
" }\n" +
271+
" }\n" +
272+
" _ => false,\n" +
273+
" }")
260274

261275

262276

‎rust-frontend/src/test/java/org/sonar/rust/parser/lexer/IdentifierTest.java‎

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -66,6 +66,7 @@ public void testIdentifier() {
6666
.matches("Abc")
6767
.notMatches("as")
6868
.notMatches("trait")
69+
.notMatches("super")
6970
.notMatches("foo ")
7071
.notMatches("r#")
7172
.matches("r#a")
@@ -74,6 +75,8 @@ public void testIdentifier() {
7475
.notMatches("s#52")
7576
.matches("phenotype")
7677
.matches("crate_type")
78+
.matches("await_token")
79+
.matches("if_ok")
7780

7881
;
7982

‎rust-frontend/src/test/java/org/sonar/rust/parser/lexer/PathTest.java‎

Lines changed: 23 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -86,6 +86,26 @@ public void testGenericArgsBinding() {
8686
}
8787

8888

89+
@Test
90+
public void testGenericArg() {
91+
assertThat(RustGrammar.create().build().rule(RustGrammar.GENERIC_ARG))
92+
.matches("T")
93+
.matches("i32")
94+
.matches("Circle")
95+
.matches("U=i32")
96+
.matches("V=f64")
97+
.matches("Pin<T>")
98+
.matches("Pin<Box<T>>")
99+
.matches("Pin<Box<(dyn Future<T>)>>")
100+
.matches("Pin<Box<(dyn Future<A = B>)>>")
101+
.matches("Pin<Box<(dyn Future<A = Result<T>>)>>")
102+
.matches("Pin<Box<(dyn Future<A = Result<T,(U,V)>>)>>")
103+
104+
105+
;
106+
}
107+
108+
89109
@Test
90110
public void testGenericArgs() {
91111
assertThat(RustGrammar.create().build().rule(RustGrammar.GENERIC_ARGS))
@@ -98,15 +118,14 @@ public void testGenericArgs() {
98118
.matches("<Circle, f64, u8>")
99119
.matches("<U=i32>")
100120
.matches("<V=f64>")
101-
//FIXME.matches("<T,U,V=f64>")
121+
.matches("<T,U,V=f64>")
102122
.matches("<Pin<T>>")
103123
.matches("<Pin<Box<T>>>")
104124
.matches("<Pin<Box<(dyn Future<T>)>>>")
105125
.matches("<Pin<Box<(dyn Future<A = B>)>>>")
106126
.matches("<Pin<Box<(dyn Future<A = Result<T>>)>>>")
107127
.matches("<Pin<Box<(dyn Future<A = Result<T,(U,V)>>)>>>")
108128

109-
110129
;
111130
}
112131

@@ -117,6 +136,7 @@ public void testQualifiedPathType() {
117136
.matches("<T1 as T>")
118137
.matches("<X as Default>")
119138

139+
120140
;
121141
}
122142

@@ -135,8 +155,7 @@ public void testQualifiedPathInType() {
135155
assertThat(RustGrammar.create().build().rule(RustGrammar.QUALIFIED_PATH_IN_TYPE))
136156
.matches("<S as T1>::f")
137157
.matches("<X as Default>::default()")
138-
139-
158+
.matches("<[T] as SpanlessEq>::eq(self, other)")
140159
;
141160
}
142161

‎rust-frontend/src/test/java/org/sonar/rust/parser/macro/MacroTest.java‎

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -90,6 +90,7 @@ public void testMacroInvocation() {
9090
.matches("panic!()")
9191
.matches("println!(\"{}, {}\", word, j)")
9292
.notMatches("")
93+
.matches("Token![#]")
9394
;
9495
}
9596

‎rust-frontend/src/test/java/org/sonar/rust/parser/types/TypeTest.java‎

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -92,6 +92,7 @@ public void testTypeNoBounds() {
9292
.notMatches("Circle{")
9393
.matches("[u8]")
9494
.matches("extern \"C\" fn(this: *mut iasset) -> i32")
95+
.matches("Token![#]")
9596

9697

9798

@@ -182,6 +183,8 @@ public void testType() {
182183
" + Send")
183184
.matches("impl FnOnce()")
184185
.matches("<X as Default>::default()")
186+
.matches("Token![#]")
187+
185188

186189

187190

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