Added phone_number_country_code function

Makefile

@@ -3,10 +3,7 @@ CONFIG := release
 
 # Extension packaging options
 EXTENSION := pg_libphonenumber
-version := 0.1.0
+DATA := sql/$(EXTENSION)--*.sql
-# TODO: include scripts for all versions.
-extension_script := sql/$(EXTENSION)--$(version).sql
-DATA := $(extension_script)
 REGRESS := regression
 
 # Build options

expected/regression.out

@@ -15,3 +15,11 @@ DETAIL:  National number is too long
 select parse_phone_number('555-555-55555555555', 'US');
 ERROR:  unable to parse '555-555-55555555555' as a phone number
 DETAIL:  National number is too long
+-- Do we get correct country codes?
+-- TODO: expand.
+select phone_number_country_code(parse_phone_number('+1-555-555-5555', 'USA'));
+ phone_number_country_code 
+---------------------------
+                         1
+(1 row)
+

sql/pg_libphonenumber--0.1.0.sql

@@ -1,9 +1,11 @@
--- complain if script is sourced in psql, rather than via CREATE EXTENSION
+-- Complain if script is sourced in psql, rather than via CREATE EXTENSION
 \echo Use "CREATE EXTENSION pg_libphonenumber" to load this file. \quit
 
-CREATE TYPE phone_number;
+--
+-- Phone number type
+--
 
---Basic function definitions
+CREATE TYPE phone_number;
 
 CREATE FUNCTION phone_number_in(cstring) RETURNS phone_number
     LANGUAGE c IMMUTABLE STRICT
@@ -31,12 +33,16 @@ CREATE TYPE phone_number (
     STORAGE = plain
 );
 
---Cast definitions
+--
+-- Casts
+--
 
 CREATE CAST (phone_number AS text)
     WITH INOUT;
 
---Operator definitions
+--
+-- Operators and indexing
+--
 
 CREATE FUNCTION phone_number_equal(phone_number, phone_number) RETURNS bool
     LANGUAGE c IMMUTABLE STRICT
@@ -137,9 +143,14 @@ CREATE OPERATOR CLASS phone_number_ops
         OPERATOR 5 >,
         FUNCTION 1 phone_number_cmp(phone_number, phone_number);
 
---General functions
+--
+-- General functions
+--
 
 CREATE FUNCTION parse_phone_number(text, text) RETURNS phone_number
     LANGUAGE c IMMUTABLE STRICT
     AS 'pg_libphonenumber', 'parse_phone_number';
 
+CREATE FUNCTION phone_number_country_code(phone_number) RETURNS integer
+    LANGUAGE c IMMUTABLE STRICT
+    AS 'pg_libphonenumber', 'phone_number_country_code';

sql/regression.sql

@@ -8,3 +8,6 @@ select parse_phone_number('555-555-5555555555', 'US');
 --Produces an error from libphonenumber
 select parse_phone_number('555-555-55555555555', 'US');
 
+-- Do we get correct country codes?
+-- TODO: expand.
+select phone_number_country_code(parse_phone_number('+1-555-555-5555', 'USA'));

src/pg_libphonenumber.cpp

@@ -76,6 +76,10 @@ extern "C" {
         PG_MODULE_MAGIC;
     #endif
 
+    /*
+     * I/O functions
+     */
+
     PGDLLEXPORT PG_FUNCTION_INFO_V1(phone_number_in);
 
     PGDLLEXPORT Datum
@@ -95,31 +99,6 @@ extern "C" {
         }
     }
 
-    PGDLLEXPORT PG_FUNCTION_INFO_V1(parse_phone_number);
-
-    PGDLLEXPORT Datum
-    parse_phone_number(PG_FUNCTION_ARGS) {
-        try {
-            const text* number_text = PG_GETARG_TEXT_P(0);
-            const text* country_text = PG_GETARG_TEXT_P(1);
-
-            char* number_str = text_to_c_string(number_text);
-            char* country = text_to_c_string(country_text);
-
-            ShortPhoneNumber* number = parse_phone_number(number_str, country);
-            //TODO: prevent leaks.
-            pfree(number_str);
-            pfree(country);
-            if(number) {
-                PG_RETURN_POINTER(number);
-            } else {
-                PG_RETURN_NULL();
-            }
-        } catch(std::exception& e) {
-            reportException(e);
-        }
-    }
-
     PGDLLEXPORT PG_FUNCTION_INFO_V1(phone_number_out);
 
     PGDLLEXPORT Datum
@@ -186,6 +165,10 @@ extern "C" {
         PG_RETURN_NULL();
     }
 
+    /*
+     * Operator functions
+     */
+
     PGDLLEXPORT PG_FUNCTION_INFO_V1(phone_number_equal);
 
     PGDLLEXPORT Datum
@@ -300,4 +283,45 @@ extern "C" {
         PG_RETURN_NULL();
     }
 
+    /*
+     * Other functions
+     */
+
+    PGDLLEXPORT PG_FUNCTION_INFO_V1(parse_phone_number);
+
+    PGDLLEXPORT Datum
+    parse_phone_number(PG_FUNCTION_ARGS) {
+        try {
+            const text* number_text = PG_GETARG_TEXT_P(0);
+            const text* country_text = PG_GETARG_TEXT_P(1);
+
+            char* number_str = text_to_c_string(number_text);
+            char* country = text_to_c_string(country_text);
+
+            ShortPhoneNumber* number = parse_phone_number(number_str, country);
+            //TODO: prevent leaks.
+            pfree(number_str);
+            pfree(country);
+            if(number) {
+                PG_RETURN_POINTER(number);
+            } else {
+                PG_RETURN_NULL();
+            }
+        } catch(std::exception& e) {
+            reportException(e);
+        }
+    }
+
+    PGDLLEXPORT PG_FUNCTION_INFO_V1(phone_number_country_code);
+
+    PGDLLEXPORT Datum
+    phone_number_country_code(PG_FUNCTION_ARGS) {
+        try {
+            const ShortPhoneNumber* number = (ShortPhoneNumber*)PG_GETARG_POINTER(0);
+
+            PG_RETURN_INT32(number->country_code());
+        } catch(std::exception& e) {
+            reportException(e);
+        }
+    }
 }