added options.antlr to support antlr syntax

README.md

@@ -98,6 +98,27 @@ console.log(re.test('96')); //=> false
 
 ## Options
 
+### options.antlr
+
+**Type**: `boolean`
+
+**Deafault**: `undefined`
+
+Enable generate regex to support antlr
+
+```js
+var toRegexRange = require('to-regex-range');
+var source = toRegexRange('-128', '127', {capture: true, antlr: true});
+console.log("-128 -> 127 = "+source);
+
+-128 -> 127 = ('-'[1-9]
+|'-''12'[0-8]
+|'-'?[1-9][0-9]
+|'-'?'1'[01][0-9]
+|[0-9]
+|'12'[0-7])
+```
+
 ### options.capture
 
 **Type**: `boolean`
@@ -282,4 +303,4 @@ Released under the [MIT License](LICENSE).
 
 ***
 
-_This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.7.0, on July 25, 2018._
+_This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.7.0, on July 25, 2018._

index.js

@@ -7,9 +7,16 @@
 
 'use strict';
 
-const isNumber = require('is-number');
+//const isNumber = require('is-number');
+
+function isNumber(n){
+  var re = new RegExp('^-?[0-9]+$');
+  //console.log(n+'='+re.test(n));
+  return re.test(n);
+}
 
 function toRegexRange(min, max, options) {
+  toRegexRange.cache = {};
   if (isNumber(min) === false) {
     throw new TypeError('toRegexRange: expected the first argument to be a number');
   }
@@ -75,14 +82,25 @@ function toRegexRange(min, max, options) {
   return tok.result;
 }
 
-toRegexRange.cache = {};
-
 function siftPatterns(neg, pos, options) {
-  let onlyNegative = filterPatterns(neg, pos, '-', false, options) || [];
-  let onlyPositive = filterPatterns(pos, neg, '', false, options) || [];
-  let intersected = filterPatterns(neg, pos, '-?', true, options) || [];
+  let onlyNegative;
+  let onlyPositive;
+  let intersected;
+  if (options.antlr){
+    onlyNegative = filterPatterns(neg, pos, "'-'", false, options) || [];
+    onlyPositive = filterPatterns(pos, neg, '', false, options) || [];
+    intersected = filterPatterns(neg, pos, "'-'?", true, options) || [];
+  }else{
+    onlyNegative = filterPatterns(neg, pos, '-', false, options) || [];
+    onlyPositive = filterPatterns(pos, neg, '', false, options) || [];
+    intersected = filterPatterns(neg, pos, '-?', true, options) || [];
+  }
   let subpatterns = onlyNegative.concat(intersected).concat(onlyPositive);
-  return subpatterns.join('|');
+  if (options.antlr){
+    return subpatterns.join('\n|');
+  }else{
+    return subpatterns.join('|');
+  }
 }
 
 function splitToRanges(min, max) {
@@ -129,24 +147,51 @@ function rangeToPattern(start, stop, options) {
 
   let pattern = '';
   let digits = 0;
+  var singleQuote=false;
 
   while (++i < len) {
     let numbers = zipped[i];
     let startDigit = numbers[0];
     let stopDigit = numbers[1];
-
+    //console.log("startDigit="+startDigit);
     if (startDigit === stopDigit) {
+      if (options.antlr) {
+        if (!singleQuote){
+          pattern="'";
+          singleQuote=true;
+        }
+      }
       pattern += startDigit;
 
     } else if (startDigit !== '0' || stopDigit !== '9') {
+      if (options.antlr) {
+        if (singleQuote){
+          pattern+="'";
+          singleQuote=false;
+        }
+      }
       pattern += toCharacterClass(startDigit, stopDigit);
-
     } else {
-      digits += 1;
+      if (options.antlr){
+        if (options.antlr) {
+          if (singleQuote){
+            pattern+="'";
+            singleQuote=false;
+          }
+        }
+        pattern += toCharacterClass(startDigit, stopDigit);
+      }else{
+        digits += 1;
+      }
     }
   }
 
   if (digits) {
+    if (options.antlr) {
+      if (singleQuote){
+        pattern+="'";
+      }
+    }
     pattern += options.shorthand ? '\\d' : '[0-9]';
   }
 
@@ -208,11 +253,11 @@ function filterPatterns(arr, comparison, prefix, intersection, options) {
     }
 
     if (!intersection && !contains(comparison, 'string', ele)) {
-      res.push(prefix + ele);
+        res.push(prefix+ ele);
     }
 
     if (intersection && contains(comparison, 'string', ele)) {
-      res.push(prefix + ele);
+        res.push(prefix+ ele);
     }
   }
   return res;
@@ -262,6 +307,7 @@ function toQuantifier(digits) {
   if (!stop && (!start || start === 1)) {
     return '';
   }
+  //console.log("digits="+digits+' == '+'{' + start + stop + '}');
   return '{' + start + stop + '}';
 }