feature: bindu: sandhi: ac: apply-eco-yavayava: add

Author: coderaiser

.putout.json

@@ -9,5 +9,5 @@
             "putout/declare": "off"
         }
     },
-    "ignore": ["templates"]
+    "ignore": ["templates", "dictionary"]
 }

README.md

@@ -54,6 +54,7 @@ places[0].message;
 - ✅[`ac/apply-purvarupa`](https://putout.cloudcmd.io/#/gist/23e2b612a185529ea6823e5f81d35b7d/2ace30ac469be03af1c41911b78d85e85b9a1120): [एकः पूर्वपरयोः](https://www.learnsanskrit.org/panini/vowel/#:~:text=this%20rule%20mean%3F-,%E0%A4%8F%E0%A4%95%E0%A4%83%20%E0%A4%AA%E0%A5%82%E0%A4%B0%E0%A5%8D%E0%A4%B5%E0%A4%AA%E0%A4%B0%E0%A4%AF%E0%A5%8B%E0%A4%83,-eka%E1%B8%A5%20p%C5%ABrvaparayo%E1%B8%A5)
 - ✅[`ac/apply-ayadaya`](https://putout.cloudcmd.io/#/gist/39db56c40174f61caed795c2a2dc89a7/dc956c6b0834167d9814ba70036674f4a10f56f9): [आयादयः](https://www.learnsanskrit.org/references/sandhi/vowel/#:~:text=madhu%20iva%20%E2%86%92%20madhviva-,Now,-%2C%20some%20examples%20for)
 - ✅[`ac/apply-padantad`](https://putout.cloudcmd.io/#/gist/f73f49bf102a6f2ab34a100ee29f81cc/6b1c3f1595841a08a035437924165e4b8d27896d): [एङः पदान्तादति](https://www.gingersunrise.com/i/133147357/एङ-पदनतदत);
+- ✅[`ac/apply-ec-yava-yava`](https://putout.cloudcmd.io/#/gist/102fc8086d28f5d5431272c0402b80c2/44cf7b6cdeb9a0c240d6627710a824598cdd9696): [एचोऽयवायावः](https://ashtadhyayi.com/sutraani/6/1/78);
 
 #### visarga
 

lib/pratipadika.js

@@ -0,0 +1,5 @@
+import stems from '../dictionary/stems.json' with {
+    type: 'json',
+};
+
+export const praptaPratapadika = (a) => stems[a];

lib/pratyahara.js

@@ -1,13 +1,16 @@
+const ec = [
+    'e',
+    'o',
+    'ai',
+    'au',
+];
 const ac = [
     'a',
     'i',
     'u',
     'f',
     'x',
-    'e',
-    'o',
-    'ai',
-    'au',
+    ...ec,
 ];
 
 const khar = [
@@ -23,4 +26,5 @@ const khar = [
 const createAsti = (a) => (b) => a.includes(b.toLowerCase());
 
 export const astiAc = createAsti(ac);
+export const astiEc = createAsti(ec);
 export const astiKhar = createAsti(khar);

lib/sandhi/ac/apply-eco-yavayava/fixture/apply-eco-yavayava-fix.js

@@ -0,0 +1,7 @@
+(tayasti);
+(gaviti);
+(te, eti);
+(naAyiti);
+(naAvupagacchati);
+(rAme, atra);
+(nai, pathaḥ);

lib/sandhi/ac/apply-eco-yavayava/fixture/apply-eco-yavayava.js

@@ -0,0 +1,7 @@
+te, asti;
+go, iti;
+te, eti;
+nai, iti;
+nau, upagacchati;
+rAme, atra;
+nai, pathaḥ;

lib/sandhi/ac/apply-eco-yavayava/index.js

@@ -0,0 +1,74 @@
+import {operator} from 'putout';
+import {astiAc, astiEc} from '../../../pratyahara.js';
+import {praptaPratapadika} from '../../../pratipadika.js';
+
+const {remove} = operator;
+
+export const report = () => `eco yavāyāvaḥ`;
+
+export const fix = ({path, next, name, nextName}) => {
+    if (name.endsWith('e')) {
+        path.node.name = `${name.slice(0, -1)}ay${nextName}`;
+        remove(next);
+        
+        return;
+    }
+    
+    if (name.endsWith('o')) {
+        path.node.name = `${name.slice(0, -1)}av${nextName}`;
+        remove(next);
+        
+        return;
+    }
+    
+    if (name.endsWith('ai')) {
+        path.node.name = `${name.slice(0, -1)}Ay${nextName}`;
+        remove(next);
+        
+        return;
+    }
+    
+    if (name.endsWith('au')) {
+        path.node.name = `${name.slice(0, -1)}Av${nextName}`;
+        remove(next);
+        
+        return;
+    }
+};
+
+export const traverse = ({push}) => ({
+    Identifier(path) {
+        const next = path.getNextSibling();
+        
+        if (!next.node)
+            return;
+        
+        const {name} = path.node;
+        
+        const nextName = next.node.name;
+        const first = nextName.at(0);
+        const last = name.at(-1);
+        const preLast = name.at(-2);
+        
+        if (!astiEc(last) && !astiEc(preLast + last))
+            return;
+        
+        if (!astiAc(first))
+            return;
+        
+        if (first === 'e' && first === last)
+            return;
+        
+        const stem = praptaPratapadika(name);
+        
+        if (stem && stem !== name)
+            return;
+        
+        push({
+            path,
+            next,
+            name,
+            nextName,
+        });
+    },
+});

lib/sandhi/ac/apply-eco-yavayava/index.spec.js

@@ -0,0 +1,18 @@
+import {createTest} from '@putout/test';
+import * as plugin from './index.js';
+
+const test = createTest(import.meta.url, {
+    plugins: [
+        ['apply-eco-yavayava', plugin],
+    ],
+});
+
+test('sandhi: apply-eco-yavayava: report', (t) => {
+    t.report('apply-eco-yavayava', `eco yavāyāvaḥ`);
+    t.end();
+});
+
+test('sandhi: apply-eco-yavayava: transform', (t) => {
+    t.transform('apply-eco-yavayava');
+    t.end();
+});

lib/sandhi/ac/index.js

@@ -1,3 +1,4 @@
+import * as applyEcoYavayava from './apply-eco-yavayava/index.js';
 import * as applyPadantad from './apply-padantad/index.js';
 import * as applyAyadaya from './apply-ayadaya/index.js';
 import * as applyPurvarupa from './apply-purvarupa/index.js';
@@ -14,4 +15,5 @@ export const rules = {
     'apply-purvarupa': applyPurvarupa,
     'apply-ayadaya': applyAyadaya,
     'apply-padantad': applyPadantad,
+    'apply-eco-yavayava': applyEcoYavayava,
 };

test/bindu.spec.js

@@ -127,6 +127,17 @@ test('bindu: sandhi: kharovasana', (t) => {
     t.end();
 });
 
+test('bindu: sandhi: ac: ec-yava-yava', (t) => {
+    const {code} = bindu('nai iti', {
+        type: 'slp1',
+    });
+    
+    const expected = `nayiti`;
+    
+    t.equal(code, expected);
+    t.end();
+});
+
 test('bindu: sandhi: bhobhago', (t) => {
     const {code} = bindu('namaH asti', {
         type: 'slp1',