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authorDenys Vlasenko2018-04-02 12:35:04 +0200
committerDenys Vlasenko2018-04-02 13:15:37 +0200
commit216913c290fd2b88b744c04c0a2ef21fd1410ba9 (patch)
tree906139aa9c6d05a091c55ab83d1bf547fe839f31 /shell/ash_test/ash-vars
parente84212f8346741a2d4a04b40639c44fe519cf5a7 (diff)
downloadbusybox-216913c290fd2b88b744c04c0a2ef21fd1410ba9.zip
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ash: parser: Add syntax stack for recursive parsing
This closes 10821. Upstream patch: From: Herbert Xu <herbert@gondor.apana.org.au> Date: Fri, 9 Mar 2018 00:14:02 +0800 parser: Add syntax stack for recursive parsing Without a stack of syntaxes we cannot correctly these two cases together: "${a#'$$'}" "${a#"${b-'$$'}"}" A recursive parser also helps in some other corner cases such as nested arithmetic expansion with paratheses. This patch adds a syntax stack allocated from the stack using alloca. As a side-effect this allows us to remove the naked backslashes for patterns within double-quotes, which means that EXP_QPAT also has to go. This patch also fixes removes any backslashes that precede right braces when they are present within a parameter expansion context, and backslashes that precede double quotes within inner double quotes inside a parameter expansion in a here-document context. The idea of a recursive parser is based on a patch by Harald van Dijk. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> var_bash3, var_bash4 and var_bash6 tests are updated with the output given by bash-4.3.43 With this patch, the following tests now pass for ash: dollar_repl_slash_bash2.tests squote_in_varexp2.tests squote_in_varexp.tests var_bash4.tests function old new delta readtoken1 2615 2874 +259 synstack_push - 54 +54 evalvar 574 571 -3 rmescapes 330 310 -20 subevalvar 1279 1258 -21 argstr 1146 1107 -39 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 1/4 up/down: 313/-83) Total: 230 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'shell/ash_test/ash-vars')
-rw-r--r--shell/ash_test/ash-vars/var_bash3.right4
-rw-r--r--shell/ash_test/ash-vars/var_bash4.right16
-rw-r--r--shell/ash_test/ash-vars/var_bash6.right2
-rwxr-xr-xshell/ash_test/ash-vars/var_bash6.tests2
-rw-r--r--shell/ash_test/ash-vars/var_bash7.right1
-rwxr-xr-xshell/ash_test/ash-vars/var_bash7.tests1
6 files changed, 14 insertions, 12 deletions
diff --git a/shell/ash_test/ash-vars/var_bash3.right b/shell/ash_test/ash-vars/var_bash3.right
index a97c850..8899d98 100644
--- a/shell/ash_test/ash-vars/var_bash3.right
+++ b/shell/ash_test/ash-vars/var_bash3.right
@@ -1,6 +1,6 @@
1 a041#c
2 a041#c
-3 a\041#c
+3 a041#c
4 a\041#c
5 a\041#c
6 a\041#c
@@ -17,4 +17,4 @@
17 a\tc
18 a\tc
19 atc
-20 a\tc
+20 atc
diff --git a/shell/ash_test/ash-vars/var_bash4.right b/shell/ash_test/ash-vars/var_bash4.right
index 0ef1bf6..9067e58 100644
--- a/shell/ash_test/ash-vars/var_bash4.right
+++ b/shell/ash_test/ash-vars/var_bash4.right
@@ -3,26 +3,26 @@ Replace str: _\\_\z_
Pattern: single backslash and star: "replace literal star"
Unquoted: a_\_z_b\*c
Unquoted =: a_\_z_b\*c
-Quoted: a_\_\z_b\*c
-Quoted =: a_\_\z_b\*c
+Quoted: a_\_z_b\*c
+Quoted =: a_\_z_b\*c
Pattern: double backslash and star: "replace backslash and everything after it"
Unquoted: a*b_\_z_
Unquoted =: a*b_\_z_
-Quoted: a*b_\_\z_
-Quoted =: a*b_\_\z_
+Quoted: a*b_\_z_
+Quoted =: a*b_\_z_
Source: a\bc
Replace str: _\\_\z_
Pattern: single backslash and b: "replace b"
Unquoted: a\_\_z_c
Unquoted =: a\_\_z_c
-Quoted: a\_\_\z_c
-Quoted =: a\_\_\z_c
+Quoted: a\_\_z_c
+Quoted =: a\_\_z_c
Pattern: double backslash and b: "replace backslash and b"
Unquoted: a_\_z_c
Unquoted =: a_\_z_c
-Quoted: a_\_\z_c
-Quoted =: a_\_\z_c
+Quoted: a_\_z_c
+Quoted =: a_\_z_c
Source: a\bc
Replace str: _\\_\z_ (as variable $s)
diff --git a/shell/ash_test/ash-vars/var_bash6.right b/shell/ash_test/ash-vars/var_bash6.right
index 63fc23d..115ff8b 100644
--- a/shell/ash_test/ash-vars/var_bash6.right
+++ b/shell/ash_test/ash-vars/var_bash6.right
@@ -1,5 +1,5 @@
Expected Actual
a*z : a*z
-\z : \z
+z : z
a1z a2z: a1z a2z
z : z
diff --git a/shell/ash_test/ash-vars/var_bash6.tests b/shell/ash_test/ash-vars/var_bash6.tests
index cf2e4f0..6868341 100755
--- a/shell/ash_test/ash-vars/var_bash6.tests
+++ b/shell/ash_test/ash-vars/var_bash6.tests
@@ -3,7 +3,7 @@
>a1z; >a2z;
echo 'Expected' 'Actual'
v='a bz'; echo 'a*z :' "${v/a*z/a*z}"
-v='a bz'; echo '\z :' "${v/a*z/\z}"
+v='a bz'; echo 'z :' "${v/a*z/\z}"
v='a bz'; echo 'a1z a2z:' ${v/a*z/a*z}
v='a bz'; echo 'z :' ${v/a*z/\z}
rm a1z a2z
diff --git a/shell/ash_test/ash-vars/var_bash7.right b/shell/ash_test/ash-vars/var_bash7.right
new file mode 100644
index 0000000..223b783
--- /dev/null
+++ b/shell/ash_test/ash-vars/var_bash7.right
@@ -0,0 +1 @@
+B
diff --git a/shell/ash_test/ash-vars/var_bash7.tests b/shell/ash_test/ash-vars/var_bash7.tests
new file mode 100755
index 0000000..c4ce03f
--- /dev/null
+++ b/shell/ash_test/ash-vars/var_bash7.tests
@@ -0,0 +1 @@
+x=AB; echo "${x#$'\x41'}"