DevTools TextDiff: Side-by-Side Ansicht mit gepaarten Zeilen und Highlighting in Textareas

frontend/src/tools/devtools.jsx

@@ -944,25 +944,50 @@ function KeyGen({ toast }) {
 function diffLines(a, b) {
   const aLines = a.split('\n');
   const bLines = b.split('\n');
-  // Myers diff (simple LCS-based)
   const m = aLines.length, n = bLines.length;
+  // LCS dp
   const dp = Array.from({length: m+1}, () => new Array(n+1).fill(0));
   for (let i = m-1; i >= 0; i--)
     for (let j = n-1; j >= 0; j--)
       dp[i][j] = aLines[i] === bLines[j] ? dp[i+1][j+1]+1 : Math.max(dp[i+1][j], dp[i][j+1]);
-
-  const result = [];
+  // Build flat ops
+  const ops = [];
   let i = 0, j = 0;
   while (i < m || j < n) {
     if (i < m && j < n && aLines[i] === bLines[j]) {
-      result.push({ type: 'same', text: aLines[i] }); i++; j++;
+      ops.push({type:'same', a:aLines[i], b:bLines[j]}); i++; j++;
     } else if (j < n && (i >= m || dp[i][j+1] >= dp[i+1][j])) {
-      result.push({ type: 'add', text: bLines[j] }); j++;
+      ops.push({type:'add', a:null, b:bLines[j]}); j++;
     } else {
-      result.push({ type: 'del', text: aLines[i] }); i++;
+      ops.push({type:'del', a:aLines[i], b:null}); i++;
     }
   }
-  return result;
+  // Pair up consecutive del+add into 'change' rows
+  const paired = [];
+  let k = 0;
+  while (k < ops.length) {
+    if (ops[k].type==='del' && k+1 < ops.length && ops[k+1].type==='add') {
+      paired.push({type:'change', a:ops[k].a, b:ops[k+1].b}); k+=2;
+    } else {
+      paired.push(ops[k]); k++;
+    }
+  }
+  return paired;
+}
+
+// Compute set of changed line numbers (1-based) for a given side
+function changedLineNums(pairs, side) {
+  const set = new Set();
+  let ln = 0;
+  pairs.forEach(p => {
+    if (p.type==='same') { ln++; }
+    else if (p.type==='change') { ln++; set.add(ln); }
+    else if (p.type==='del' && side==='a') { ln++; set.add(ln); }
+    else if (p.type==='add' && side==='b') { ln++; set.add(ln); }
+    else if (p.type==='del' && side==='b') { /* b has no line here */ }
+    else if (p.type==='add' && side==='a') { /* a has no line here */ }
+  });
+  return set;
 }
 
 function TextDiff({ mobile }) {
@@ -986,17 +1011,39 @@ function TextDiff({ mobile }) {
     e.target.value = '';
   }
 
-  const added   = diff ? diff.filter(d=>d.type==='add').length : 0;
-  const removed = diff ? diff.filter(d=>d.type==='del').length : 0;
+  const added   = diff ? diff.filter(d=>d.type==='add'||d.type==='change').length : 0;
+  const removed = diff ? diff.filter(d=>d.type==='del'||d.type==='change').length : 0;
   const same    = diff ? diff.filter(d=>d.type==='same').length : 0;
 
+  // Which lines are changed in each textarea (for background highlight)
+  const changedA = diff ? changedLineNums(diff, 'a') : new Set();
+  const changedB = diff ? changedLineNums(diff, 'b') : new Set();
+
   const ta = { ...S.inp, fontSize:12, fontFamily:"'Courier New',monospace", width:'100%',
-    boxSizing:'border-box', minHeight:180, resize:'vertical', lineHeight:1.6 };
+    boxSizing:'border-box', minHeight:180, resize:'vertical', lineHeight:'1.6', padding:'7px 8px' };
+
+  function LineNumCol({ text, changedSet }) {
+    const lines = (text||' ').split('\n');
+    return (
+      <div style={{
+        padding:'7px 6px', minWidth:36, textAlign:'right', userSelect:'none',
+        fontFamily:"'Courier New',monospace", fontSize:12, lineHeight:'1.6',
+        background:'rgba(0,0,0,0.2)', borderRight:'1px solid rgba(255,255,255,0.07)',
+        whiteSpace:'pre', flexShrink:0}}>
+        {lines.map((_, i) => (
+          <div key={i} style={{
+            color: changedSet.has(i+1) ? '#ff6b9d' : 'rgba(255,255,255,0.25)',
+            background: changedSet.has(i+1) ? 'rgba(255,107,157,0.12)' : 'transparent',
+          }}>{i+1}</div>
+        ))}
+      </div>
+    );
+  }
 
   return (
     <div>
       <div style={{display:'grid', gridTemplateColumns: mobile?'1fr':'1fr 1fr', gap:12, marginBottom:12}}>
-        {[['left','Text A (Original)', left, setLeft], ['right','Text B (Neu)', right, setRight]].map(([side, label, val, setter])=>(
+        {([['left','Text A (Original)', left, setLeft, changedA], ['right','Text B (Neu)', right, setRight, changedB]]).map(([side, label, val, setter, cset])=>(
           <div key={side}>
             <div style={{display:'flex', alignItems:'center', gap:8, marginBottom:6}}>
               <span style={{color:'rgba(255,255,255,0.55)', fontFamily:'monospace', fontSize:10, flex:1}}>{label}</span>
@@ -1006,15 +1053,8 @@ function TextDiff({ mobile }) {
                   style={{display:'none'}} onChange={e=>loadFile(e,setter)}/>
               </label>
             </div>
-            {/* Textarea mit Zeilennummern */}
             <div style={{display:'flex', borderRadius:6, overflow:'hidden', border:'1px solid rgba(255,255,255,0.1)', background:'rgba(255,255,255,0.04)'}}>
-              <div style={{
-                padding:'7px 6px', minWidth:36, textAlign:'right', userSelect:'none',
-                fontFamily:"'Courier New',monospace", fontSize:12, lineHeight:'1.6',
-                color:'rgba(255,255,255,0.25)', background:'rgba(0,0,0,0.2)',
-                borderRight:'1px solid rgba(255,255,255,0.07)', whiteSpace:'pre'}}>
-                {(val||' ').split('\n').map((_,i)=>i+1).join('\n')}
-              </div>
+              <LineNumCol text={val} changedSet={cset}/>
               <textarea style={{...ta, border:'none', borderRadius:0, background:'transparent', flex:1, resize:'vertical'}}
                 value={val} placeholder="Text hier einfügen…"
                 onChange={e=>{ setter(e.target.value); setDiff(null); }}/>
@@ -1033,9 +1073,9 @@ function TextDiff({ mobile }) {
         {!!diff && (
           <div style={{display:'flex', gap:10, alignItems:'center', flexWrap:'wrap'}}>
             <span style={{background:'rgba(255,107,157,0.15)', color:'#ff6b9d', fontFamily:'monospace',
-              fontSize:11, padding:'4px 10px', borderRadius:6}}>− {removed} entfernt</span>
+              fontSize:11, padding:'4px 10px', borderRadius:6}}>− {removed} entfernt/geändert</span>
             <span style={{background:'rgba(78,205,196,0.15)', color:'#4ecdc4', fontFamily:'monospace',
-              fontSize:11, padding:'4px 10px', borderRadius:6}}>+ {added} hinzugefügt</span>
+              fontSize:11, padding:'4px 10px', borderRadius:6}}>+ {added} hinzugefügt/geändert</span>
             <span style={{background:'rgba(255,255,255,0.05)', color:'rgba(255,255,255,0.45)', fontFamily:'monospace',
               fontSize:11, padding:'4px 10px', borderRadius:6}}>= {same} gleich</span>
           </div>
@@ -1044,33 +1084,69 @@ function TextDiff({ mobile }) {
 
       {!!diff && (
         <div style={{borderRadius:9, border:'1px solid rgba(255,255,255,0.08)',
-          overflow:'auto', maxHeight:480, background:'rgba(0,0,0,0.2)'}}>
-          <table style={{width:'100%', borderCollapse:'collapse', fontFamily:"'Courier New',monospace", fontSize:12}}>
+          overflow:'auto', maxHeight:520, background:'rgba(0,0,0,0.2)'}}>
+          {/* Header */}
+          <div style={{display:'grid', gridTemplateColumns:'36px 16px 1fr 36px 16px 1fr',
+            borderBottom:'1px solid rgba(255,255,255,0.1)', background:'rgba(255,255,255,0.04)'}}>
+            <div style={{gridColumn:'1/4', padding:'5px 10px', color:'rgba(255,255,255,0.4)', fontFamily:'monospace', fontSize:10, borderRight:'1px solid rgba(255,255,255,0.08)'}}>Text A (Original)</div>
+            <div style={{gridColumn:'4/7', padding:'5px 10px', color:'rgba(255,255,255,0.4)', fontFamily:'monospace', fontSize:10}}>Text B (Neu)</div>
+          </div>
+          <table style={{width:'100%', borderCollapse:'collapse', fontFamily:"'Courier New',monospace", fontSize:12, tableLayout:'fixed'}}>
+            <colgroup>
+              <col style={{width:36}}/><col style={{width:16}}/><col/>
+              <col style={{width:36}}/><col style={{width:16}}/><col/>
+            </colgroup>
             <tbody>
               {(()=>{
                 let lnA=0, lnB=0;
                 return diff.map((d,i)=>{
-                  if (d.type==='del') lnA++;
-                  else if (d.type==='add') lnB++;
-                  else { lnA++; lnB++; }
-                  const ln = d.type==='add' ? lnB : lnA;
+                  const isChange = d.type==='change';
+                  const isDel    = d.type==='del';
+                  const isAdd    = d.type==='add';
+                  const isSame   = d.type==='same';
+                  if (isSame)   { lnA++; lnB++; }
+                  if (isChange) { lnA++; lnB++; }
+                  if (isDel)    lnA++;
+                  if (isAdd)    lnB++;
+
+                  const bgA = (isDel||isChange) ? 'rgba(255,107,157,0.1)' : 'transparent';
+                  const bgB = (isAdd||isChange) ? 'rgba(78,205,196,0.1)'  : 'transparent';
+                  const colA = isDel||isChange ? '#ffb3cc' : 'rgba(255,255,255,0.65)';
+                  const colB = isAdd||isChange ? '#a8f0eb' : 'rgba(255,255,255,0.65)';
+                  const symA = isDel?'−': isChange?'~':'';
+                  const symB = isAdd?'+': isChange?'~':'';
+                  const symColA = isDel?'#ff6b9d': isChange?'#ffe66d':'rgba(255,255,255,0.15)';
+                  const symColB = isAdd?'#4ecdc4': isChange?'#ffe66d':'rgba(255,255,255,0.15)';
+
                   return (
-                    <tr key={i} style={{
-                      background: d.type==='add'?'rgba(78,205,196,0.1)':d.type==='del'?'rgba(255,107,157,0.1)':'transparent',
-                      borderBottom:'1px solid rgba(255,255,255,0.03)'}}>
-                      <td style={{width:36,textAlign:'right',padding:'2px 8px',userSelect:'none',
-                        color:'rgba(255,255,255,0.2)',fontFamily:"'Courier New',monospace",fontSize:11,
-                        borderRight:'1px solid rgba(255,255,255,0.05)'}}>
-                        {ln}
+                    <tr key={i} style={{borderBottom:'1px solid rgba(255,255,255,0.03)'}}>
+                      {/* Side A */}
+                      <td style={{background:bgA, textAlign:'right', padding:'2px 6px', color:'rgba(255,255,255,0.2)',
+                        borderRight:'1px solid rgba(255,255,255,0.05)', userSelect:'none', fontSize:11}}>
+                        {(isDel||isChange||isSame) ? lnA : ''}
                       </td>
-                      <td style={{width:24,textAlign:'center',padding:'2px 6px',userSelect:'none',
-                        color:d.type==='add'?'#4ecdc4':d.type==='del'?'#ff6b9d':'rgba(255,255,255,0.2)',
-                        fontWeight:700,fontSize:14,borderRight:'1px solid rgba(255,255,255,0.05)'}}>
-                        {d.type==='add'?'+':d.type==='del'?'−':''}
+                      <td style={{background:bgA, textAlign:'center', padding:'2px 3px', color:symColA,
+                        fontWeight:700, fontSize:13, userSelect:'none',
+                        borderRight:'1px solid rgba(255,255,255,0.06)'}}>
+                        {symA}
                       </td>
-                      <td style={{padding:'3px 10px',whiteSpace:'pre-wrap',wordBreak:'break-all',
-                        color:d.type==='add'?'#a8f0eb':d.type==='del'?'#ffb3cc':'rgba(255,255,255,0.65)'}}>
-                        {d.text||' '}
+                      <td style={{background:bgA, padding:'3px 8px', whiteSpace:'pre-wrap', wordBreak:'break-all',
+                        color:colA, borderRight:'2px solid rgba(255,255,255,0.06)'}}>
+                        {(isDel||isChange||isSame) ? (d.a ?? d.text ?? ' ') : ''}
+                      </td>
+                      {/* Side B */}
+                      <td style={{background:bgB, textAlign:'right', padding:'2px 6px', color:'rgba(255,255,255,0.2)',
+                        borderRight:'1px solid rgba(255,255,255,0.05)', userSelect:'none', fontSize:11}}>
+                        {(isAdd||isChange||isSame) ? lnB : ''}
+                      </td>
+                      <td style={{background:bgB, textAlign:'center', padding:'2px 3px', color:symColB,
+                        fontWeight:700, fontSize:13, userSelect:'none',
+                        borderRight:'1px solid rgba(255,255,255,0.06)'}}>
+                        {symB}
+                      </td>
+                      <td style={{background:bgB, padding:'3px 8px', whiteSpace:'pre-wrap', wordBreak:'break-all',
+                        color:colB}}>
+                        {(isAdd||isChange||isSame) ? (d.b ?? d.text ?? ' ') : ''}
                       </td>
                     </tr>
                   );