From 595dced7bdc644fc910ee32bac1467e9bb9d7f02 Mon Sep 17 00:00:00 2001
From: Victor <melnikukr@mail.ru>
Date: Wed, 15 Apr 2015 23:40:18 +0300
Subject: [PATCH] =?UTF-8?q?=D0=9F=D0=B0=D1=80=D1=81=D0=B8=D0=BD=D0=B3=20?=
 =?UTF-8?q?=D1=83=D1=81=D0=BB=D0=BE=D0=B2=D0=BD=D1=8B=D1=85=20=D0=B2=D1=8B?=
 =?UTF-8?q?=D1=80=D0=B0=D0=B6=D0=B5=D0=BD=D0=B8=D0=B9=20if?=
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---
 src/com/annimon/everlastingsummer/Lexer.java  |  3 ++
 src/com/annimon/everlastingsummer/Parser.java | 29 +++++++++++++++++++
 .../annimon/everlastingsummer/TokenType.java  |  3 ++
 3 files changed, 35 insertions(+)

diff --git a/src/com/annimon/everlastingsummer/Lexer.java b/src/com/annimon/everlastingsummer/Lexer.java
index e5824d6..eec60e3 100644
--- a/src/com/annimon/everlastingsummer/Lexer.java
+++ b/src/com/annimon/everlastingsummer/Lexer.java
@@ -51,6 +51,9 @@ public final class Lexer {
         KEYWORDS.put("jump", TokenType.JUMP);
         KEYWORDS.put("label", TokenType.LABEL);
         
+        KEYWORDS.put("if", TokenType.IF);
+        KEYWORDS.put("endif", TokenType.ENDIF);
+        
         KEYWORDS.put("renpy.pause", TokenType.RENPY_PAUSE);
         KEYWORDS.put("persistent.sprite_time", TokenType.PERSISTENT_SPRITE_TIME);
         KEYWORDS.put("prolog_time", TokenType.PROLOG_TIME);
diff --git a/src/com/annimon/everlastingsummer/Parser.java b/src/com/annimon/everlastingsummer/Parser.java
index 81a8de4..e0f9a31 100644
--- a/src/com/annimon/everlastingsummer/Parser.java
+++ b/src/com/annimon/everlastingsummer/Parser.java
@@ -136,6 +136,7 @@ public final class Parser {
         }
         
         if (match(token, TokenType.JUMP)) return jump();
+        if (match(token, TokenType.IF)) return ifStatement();
         
         if (lookMatch(1, TokenType.COLON)) {
             // menu:
@@ -363,6 +364,34 @@ public final class Parser {
         return false;
     }
     
+    private boolean ifStatement() {
+        final Expression condition = primary();
+        consume(TokenType.COLON);
+        
+        if (condition.eval() == 0) {
+            // Если условие не верно, пропускаем блок до следующего ENDIF
+            int pos = 0;
+            int level = 1; // уровень вложенности блока
+            while (true) {
+                // Расчёт уровня блока.
+                if (lookMatch(pos, TokenType.IF)) {
+                    level++;
+                    pos++;
+                }
+                if (lookMatch(pos, TokenType.ENDIF)) {
+                    level--;
+                    // Завершаем работу по достижению ENDIF первого уровня.
+                    if (level <= 0) break;
+                }
+                
+                if (lookMatch(pos, TokenType.EOF)) return false;
+                pos++;
+            }
+            position += pos;
+        }
+        return false;
+    }
+    
     private Expression expression() {
         return primary();
     }
diff --git a/src/com/annimon/everlastingsummer/TokenType.java b/src/com/annimon/everlastingsummer/TokenType.java
index de95fc4..e7be886 100644
--- a/src/com/annimon/everlastingsummer/TokenType.java
+++ b/src/com/annimon/everlastingsummer/TokenType.java
@@ -48,6 +48,9 @@ public enum TokenType {
     LABEL,
     RETURN,
     
+    IF,
+    ENDIF,
+    
     // команды
     RENPY_PAUSE,
     PERSISTENT_SPRITE_TIME,