From: Michael D. Lowis <mike.lowis@gentex.com>
Date: Tue, 10 Jan 2017 13:25:52 +0000 (-0500)
Subject: Added brace balancing to the block selection
X-Git-Url: https://git.mdlowis.com/?a=commitdiff_plain;h=18673f0476467708a33d5d6677cb3440ca27b9fe;p=projs%2Ftide.git

Added brace balancing to the block selection
---

diff --git a/TODO.md b/TODO.md
index a07c6c4..66c9754 100644
--- a/TODO.md
+++ b/TODO.md
@@ -2,11 +2,10 @@
 
 Up Next:
 
-* invalid memory accesses while viewing docs/waf
-* Tag line count should account for wrapped lines
-* block selection should handle brace-balancing
 * context sensitive selection of words, commands, line numbers, or filenames.
+* Tag line count should account for wrapped lines
 * ctrl+alt+f should find next occurence of previous search term
+* invalid memory accesses while viewing docs/waf
 * check for file changes on save
 * check for file changes when window regains focus
 
@@ -19,10 +18,8 @@ The Rest:
 * Add a tools dir to namespace utility scripts only useful inside the editor
 * implement command diffing logic to optimize the undo/redo log
 * add command line flags to toggle options (Tabs, Indent, etc..)
-* backspace should delete indent if preceded by whitespace
 * Add a ctrl+space shortcut to autocomplete ctag
 * off by one error on scrolling up with wrapped lines
-* Auto-save on focus change or quit
 
 # Auxillary Programs
 
diff --git a/inc/edit.h b/inc/edit.h
index bd0aa6a..37bd478 100644
--- a/inc/edit.h
+++ b/inc/edit.h
@@ -78,6 +78,7 @@ unsigned buf_bow(Buf* buf, unsigned pos);
 unsigned buf_eow(Buf* buf, unsigned pos);
 unsigned buf_lscan(Buf* buf, unsigned pos, Rune r);
 unsigned buf_rscan(Buf* buf, unsigned pos, Rune r);
+void buf_getblock(Buf* buf, Rune beg, Rune end, Sel* sel);
 
 unsigned buf_byrune(Buf* buf, unsigned pos, int count);
 unsigned buf_byword(Buf* buf, unsigned pos, int count);
diff --git a/lib/buf.c b/lib/buf.c
index e0b1bfe..555f0a8 100644
--- a/lib/buf.c
+++ b/lib/buf.c
@@ -380,6 +380,39 @@ unsigned buf_rscan(Buf* buf, unsigned pos, Rune r) {
     return (buf_get(buf, off) == r ? off : pos);
 }
 
+void buf_getblock(Buf* buf, Rune first, Rune last, Sel* sel) {
+    int balance = 0, dir;
+    unsigned beg = sel->end, end = sel->end, off;
+    
+    /* figure out which end of the block we're starting at */
+    if (buf_get(buf, end) == first)
+        dir = +1, balance++, beg = end++;
+    else if (buf_get(buf, end) == last)
+        dir = -1, balance--, beg = end--;
+    else
+        return;
+    
+    /* scan for a blanced set of braces */
+    while (true) {
+        if (buf_get(buf, end) == first)
+            balance++;
+        else if (buf_get(buf, end) == last)
+            balance--;
+        
+        if (balance == 0 || end >= buf_end(buf) || end == 0)
+            break;
+        else
+            end += dir;
+    }
+    
+    /* bail if we failed to find a block */
+    if (balance != 0) return;
+    
+    /* update the passed in selection */
+    if (end > beg) beg++, end--;
+    sel->beg = beg, sel->end = end;
+}
+
 /*****************************************************************************/
 
 unsigned buf_byrune(Buf* buf, unsigned pos, int count) {
diff --git a/lib/view.c b/lib/view.c
index bd1e029..b4ba8bc 100644
--- a/lib/view.c
+++ b/lib/view.c
@@ -319,17 +319,11 @@ static void selcontext(View* view, Sel* sel) {
         sel->beg = buf_bow(buf, sel->end);
         sel->end = buf_eow(buf, sel->end++);
     } else if (r == '(' || r == ')') {
-        sel->beg = buf_lscan(buf, sel->end,   '(');
-        sel->end = buf_rscan(buf, sel->end++, ')');
-        sel->beg++, sel->end--;
+        buf_getblock(buf, '(', ')', sel);
     } else if (r == '[' || r == ']') {
-        sel->beg = buf_lscan(buf, sel->end,   '[');
-        sel->end = buf_rscan(buf, sel->end++, ']');
-        sel->beg++, sel->end--;
+        buf_getblock(buf, '[', ']', sel);
     } else if (r == '{' || r == '}') {
-        sel->beg = buf_lscan(buf, sel->end,   '{');
-        sel->end = buf_rscan(buf, sel->end++, '}');
-        sel->beg++, sel->end--;
+        buf_getblock(buf, '{', '}', sel);
     } else {
         selbigword(view, sel);
     }