[PATCH v2] userdiff: Fix some corner cases in dts regex

[PATCH v2] userdiff: Fix some corner cases in dts regex

[Stephen Boyd]

While reviewing some dts diffs recently I noticed that the hunk header
logic was failing to find the containing node. This is because the regex
doesn't consider properties that may span multiple lines, i.e.

	property = <something>,
		   <something_else>;

and it got hung up on comments inside nodes that look like the root node
because they start with '/*'. Add tests for these cases and update the
regex to find them. Maybe detecting the root node is too complicated but
forcing it to be a backslash with any amount of whitespace up to an open
bracket seemed OK. I tried to detect that a comment is in-between the
two parts but I wasn't happy so I just dropped it.

Cc: Rob Herring <robh+dt@kernel.org>
Cc: Frank Rowand <frowand.list@gmail.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
---

Changes from v1:
 * Added a new boolean property unit test
 * Updated the regex to simplify multi-line property skipping
 * Added some space to multieline prop test between cells in
   first property

 t/t4018/dts-nodes-boolean-prop   |  9 +++++++++
 t/t4018/dts-nodes-multiline-prop | 14 ++++++++++++++
 t/t4018/dts-root                 |  2 +-
 t/t4018/dts-root-comment         |  8 ++++++++
 userdiff.c                       |  3 ++-
 5 files changed, 34 insertions(+), 2 deletions(-)
 create mode 100644 t/t4018/dts-nodes-boolean-prop
 create mode 100644 t/t4018/dts-nodes-multiline-prop
 create mode 100644 t/t4018/dts-root-comment

diff --git a/t/t4018/dts-nodes-boolean-prop b/t/t4018/dts-nodes-boolean-prop
new file mode 100644
index 000000000000..afc6b5b404e4
--- /dev/null
+++ b/t/t4018/dts-nodes-boolean-prop
@@ -0,0 +1,9 @@
+/ {
+	label_1: node1@ff00 {
+		RIGHT@deadf00,4000 {
+			boolean-prop1;
+
+			ChangeMe;
+		};
+	};
+};
diff --git a/t/t4018/dts-nodes-multiline-prop b/t/t4018/dts-nodes-multiline-prop
new file mode 100644
index 000000000000..db4b4bdda686
--- /dev/null
+++ b/t/t4018/dts-nodes-multiline-prop
@@ -0,0 +1,14 @@
+/ {
+	label_1: node1@ff00 {
+		RIGHT@deadf00,4000 {
+			multilineprop = <3>,
+
+
+					<4>;
+
+
+
+			ChangeMe = <0xffeedd00>;
+		};
+	};
+};
diff --git a/t/t4018/dts-root b/t/t4018/dts-root
index 2ef9e6ffaa2c..4353b8220c91 100644
--- a/t/t4018/dts-root
+++ b/t/t4018/dts-root
@@ -1,4 +1,4 @@
-/RIGHT { /* Technically just supposed to be a slash */
+/ { RIGHT /* Technically just supposed to be a slash and brace */
 	#size-cells = <1>;
 
 	ChangeMe = <0xffeedd00>;
diff --git a/t/t4018/dts-root-comment b/t/t4018/dts-root-comment
new file mode 100644
index 000000000000..333a625c7007
--- /dev/null
+++ b/t/t4018/dts-root-comment
@@ -0,0 +1,8 @@
+/ { RIGHT /* Technically just supposed to be a slash and brace */
+	#size-cells = <1>;
+
+	/* This comment should be ignored */
+
+	some-property = <40+2>;
+	ChangeMe = <0xffeedd00>;
+};
diff --git a/userdiff.c b/userdiff.c
index 86e3244e15dd..e187d356f6ff 100644
--- a/userdiff.c
+++ b/userdiff.c
@@ -25,8 +25,9 @@ IPATTERN("ada",
 	 "|=>|\\.\\.|\\*\\*|:=|/=|>=|<=|<<|>>|<>"),
 PATTERNS("dts",
 	 "!;\n"
+	 "!=\n"
 	 /* lines beginning with a word optionally preceded by '&' or the root */
-	 "^[ \t]*((/|&?[a-zA-Z_]).*)",
+	 "^[ \t]*((/[ \t]*\\{|&?[a-zA-Z_]).*)",
 	 /* -- */
 	 /* Property names and math operators */
 	 "[a-zA-Z0-9,._+?#-]+"
-- 
Sent by a computer through tubes

Re: [PATCH v2] userdiff: Fix some corner cases in dts regex

[Johannes Sixt]

[Removed bouncing addresses of Matthieu Moy and William Duclot from Cc]

Am 16.10.19 um 22:32 schrieb Stephen Boyd:
> diff --git a/t/t4018/dts-nodes-multiline-prop b/t/t4018/dts-nodes-multiline-prop
> new file mode 100644
> index 000000000000..db4b4bdda686
> --- /dev/null
> +++ b/t/t4018/dts-nodes-multiline-prop
> @@ -0,0 +1,14 @@
> +/ {
> +	label_1: node1@ff00 {
> +		RIGHT@deadf00,4000 {
> +			multilineprop = <3>,
> +
> +
> +					<4>;

I was actually thinking about something like

			multilineprop = <3>,
					<0xabcd>,
					"text",
					name,
					<4>;

or something like that -- whatever occurs in the real world.

> +
> +
> +
> +			ChangeMe = <0xffeedd00>;
> +		};
> +	};
> +};

Apart from that, the patch looks good.

-- Hannes

Re: [PATCH v2] userdiff: Fix some corner cases in dts regex

[Stephen Boyd]

Quoting Johannes Sixt (2019-10-16 14:10:09)
> [Removed bouncing addresses of Matthieu Moy and William Duclot from Cc]
> 
> Am 16.10.19 um 22:32 schrieb Stephen Boyd:
> > diff --git a/t/t4018/dts-nodes-multiline-prop b/t/t4018/dts-nodes-multiline-prop
> > new file mode 100644
> > index 000000000000..db4b4bdda686
> > --- /dev/null
> > +++ b/t/t4018/dts-nodes-multiline-prop
> > @@ -0,0 +1,14 @@
> > +/ {
> > +     label_1: node1@ff00 {
> > +             RIGHT@deadf00,4000 {
> > +                     multilineprop = <3>,
> > +
> > +
> > +                                     <4>;
> 
> I was actually thinking about something like
> 
>                         multilineprop = <3>,
>                                         <0xabcd>,
>                                         "text",
>                                         name,
>                                         <4>;
> 
> or something like that -- whatever occurs in the real world.
> 

Ok sure. I can have a list of numbers that spans four or five lines.

> > +
> > +
> > +
> > +                     ChangeMe = <0xffeedd00>;
> > +             };
> > +     };
> > +};
> 
> Apart from that, the patch looks good.
> 

Cool. I'll resend.