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Task/ABC-problem/OpenEdge-Progress/abc-problem.openedge

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+FUNCTION canMakeWord RETURNS LOGICAL (INPUT pWord AS CHARACTER) FORWARD.
+
+/* List of blocks */
+DEFINE TEMP-TABLE ttBlocks NO-UNDO
+    FIELD ttFaces AS CHARACTER FORMAT "x(1)" EXTENT 2
+    FIELD ttUsed AS LOGICAL.
+
+/* Fill in list of blocks */
+RUN AddBlock("BO").
+RUN AddBlock("XK").
+RUN AddBlock("DQ").
+RUN AddBlock("CP").
+RUN AddBlock("NA").
+RUN AddBlock("GT").
+RUN AddBlock("Re").
+RUN AddBlock("TG").
+RUN AddBlock("QD").
+RUN AddBlock("FS").
+RUN AddBlock("JW").
+RUN AddBlock("HU").
+RUN AddBlock("VI").
+RUN AddBlock("AN").
+RUN AddBlock("OB").
+RUN AddBlock("ER").
+RUN AddBlock("FS").
+RUN AddBlock("LY").
+RUN AddBlock("PC").
+RUN AddBlock("ZM").
+
+DEFINE VARIABLE chWords AS CHARACTER EXTENT 7 NO-UNDO.
+ASSIGN  chWords[1] = "A"
+        chWords[2] = "BARK"
+        chWords[3] = "BOOK"
+        chWords[4] = "TREAT"
+        chWords[5] = "COMMON"
+        chWords[6] = "SQUAD"
+        chWords[7] = "CONFUSE".
+
+DEFINE FRAME frmResult
+    WITH NO-LABELS 7 DOWN USE-TEXT.
+
+DEFINE VARIABLE i AS INTEGER NO-UNDO.
+DO i = 1 TO 7:
+    DISPLAY chWords[i] + " = " + STRING(canMakeWord(chWords[i])) FORMAT "x(25)" WITH FRAME frmResult.
+    DOWN WITH FRAME frmResult.
+END.
+
+
+PROCEDURE AddBlock:
+    DEFINE INPUT PARAMETER i-chBlockvalue AS CHARACTER NO-UNDO.
+
+    IF (LENGTH(i-chBlockValue) <> 2)
+        THEN RETURN ERROR.
+
+    CREATE ttBlocks.
+    ASSIGN  ttBlocks.ttFaces[1] = SUBSTRING(i-chBlockValue, 1, 1)
+            ttBlocks.ttFaces[2] = SUBSTRING(i-chBlockValue, 2, 1).
+END PROCEDURE.
+
+
+FUNCTION blockInList RETURNS LOGICAL (pChar AS CHARACTER):
+    /* Find first unused block in list */
+    FIND FIRST ttBlocks WHERE (ttBlocks.ttFaces[1] = pChar
+                               OR ttBlocks.ttFaces[2] = pChar)
+                          AND NOT ttBlocks.ttUsed NO-ERROR.
+    IF (AVAILABLE ttBlocks) THEN DO:
+        /* found it! set to used and return true */
+        ASSIGN ttBlocks.ttUsed = TRUE.
+        RETURN TRUE.
+    END.
+    ELSE RETURN FALSE.
+END FUNCTION.
+
+
+FUNCTION canMakeWord RETURNS LOGICAL (INPUT pWord AS CHARACTER):
+    DEFINE VARIABLE i AS INTEGER NO-UNDO.
+    DEFINE VARIABLE chChar AS CHARACTER NO-UNDO.
+
+    /* Word has to be valid */
+    IF (LENGTH(pWord) = 0)
+        THEN RETURN FALSE.
+
+    DO i = 1 TO LENGTH(pWord):
+        /* get the char */
+        chChar = SUBSTRING(pWord, i, 1).
+
+        /* Check to see if this is a letter? */
+        IF ((ASC(chChar) < 65) OR (ASC(chChar) > 90) AND
+            (ASC(chChar) < 97) OR (ASC(chChar) > 122))
+            THEN RETURN FALSE.
+
+        /* Is block is list (and unused) */
+        IF NOT blockInList(chChar)
+            THEN RETURN FALSE.
+    END.
+
+    /* Reset all blocks */
+    FOR EACH ttBlocks:
+        ASSIGN ttUsed = FALSE.
+    END.
+    RETURN TRUE.
+END FUNCTION.