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IDENTIFICATION DIVISION.
PROGRAM-ID. CEPIS-JSON-GET.
*> ---------------------------------------------------------------------
*> Read one member out of a JSON object.
*>
*> CALL "CEPIS-JSON-GET" USING JSON-TEXT CEPIS-JSON-SCAN
*>
*> Only the members of the object delimited by JS-FROM and JS-TO are
*> considered; nested objects and arrays are skipped whole, so a member
*> named "lat" inside "geo" is not mistaken for a top-level one. Members
*> the caller does not ask about are ignored, which is what lets a new
*> field appear in the API without breaking this client.
*>
*> String values come back with their escapes decoded, including \uXXXX
*> for the whole of Unicode, encoded as UTF-8.
*> ---------------------------------------------------------------------
DATA DIVISION.
WORKING-STORAGE SECTION.
01 WS-P PIC 9(9).
01 WS-Q PIC 9(9).
01 WS-C PIC X.
01 WS-D PIC X.
01 WS-DEPTH PIC S9(9).
01 WS-IN-STRING PIC X.
01 WS-LEN PIC 9(9).
01 WS-STR PIC X(1024).
01 WS-STR-LEN PIC 9(9).
01 WS-KEY-TEXT PIC X(32).
01 WS-KEY-LEN PIC 9(9).
01 WS-VAL-START PIC 9(9).
01 WS-VAL-END PIC 9(9).
01 WS-VAL-TYPE PIC X.
01 WS-DONE PIC X.
01 WS-CODE PIC 9(9).
01 WS-LOW PIC 9(9).
01 WS-NIB PIC 9(9).
01 WS-B1 PIC 9(9).
01 WS-B2 PIC 9(9).
01 WS-B3 PIC 9(9).
01 WS-B4 PIC 9(9).
01 WS-REST PIC 9(9).
01 WS-HEX-OK PIC X.
01 WS-I PIC 9(9).
01 CONST-QUOTE PIC X VALUE '"'.
01 CONST-BACKSLASH PIC X VALUE "\".
LINKAGE SECTION.
01 JSON-TEXT PIC X(262144).
COPY "cepis-json.cpy".
PROCEDURE DIVISION USING JSON-TEXT CEPIS-JSON-SCAN.
MAIN-START.
MOVE SPACE TO JS-TYPE
MOVE SPACES TO JS-VALUE
MOVE 0 TO JS-VALUE-LEN
MOVE 0 TO JS-VSTART
MOVE 0 TO JS-VEND
MOVE "N" TO WS-DONE
MOVE JS-FROM TO WS-P
IF WS-P < 1
MOVE 1 TO WS-P
END-IF
PERFORM SKIP-BLANKS
IF WS-P > JS-TO
MOVE "E" TO JS-TYPE
GOBACK
END-IF
IF JSON-TEXT(WS-P:1) NOT = "{"
MOVE "E" TO JS-TYPE
GOBACK
END-IF
ADD 1 TO WS-P
PERFORM UNTIL WS-DONE = "Y" OR WS-P > JS-TO
PERFORM SKIP-BLANKS
IF WS-P > JS-TO
MOVE "Y" TO WS-DONE
EXIT PERFORM
END-IF
IF JSON-TEXT(WS-P:1) = "}"
MOVE "Y" TO WS-DONE
EXIT PERFORM
END-IF
IF JSON-TEXT(WS-P:1) NOT = CONST-QUOTE
MOVE "E" TO JS-TYPE
MOVE "Y" TO WS-DONE
EXIT PERFORM
END-IF
PERFORM READ-STRING
MOVE WS-STR(1:32) TO WS-KEY-TEXT
MOVE WS-STR-LEN TO WS-KEY-LEN
PERFORM SKIP-BLANKS
IF WS-P > JS-TO OR JSON-TEXT(WS-P:1) NOT = ":"
MOVE "E" TO JS-TYPE
MOVE "Y" TO WS-DONE
EXIT PERFORM
END-IF
ADD 1 TO WS-P
PERFORM SKIP-BLANKS
MOVE WS-P TO WS-VAL-START
PERFORM SCAN-VALUE
COMPUTE WS-VAL-END = WS-P - 1
IF WS-KEY-TEXT = JS-KEY AND WS-KEY-LEN <= 32
PERFORM TAKE-VALUE
MOVE "Y" TO WS-DONE
EXIT PERFORM
END-IF
PERFORM SKIP-BLANKS
IF WS-P > JS-TO
MOVE "Y" TO WS-DONE
ELSE
IF JSON-TEXT(WS-P:1) = ","
ADD 1 TO WS-P
ELSE
MOVE "Y" TO WS-DONE
END-IF
END-IF
END-PERFORM
GOBACK.
*> -------------------------------------------------------------------
SKIP-BLANKS.
PERFORM UNTIL WS-P > JS-TO
MOVE JSON-TEXT(WS-P:1) TO WS-C
IF WS-C = SPACE OR WS-C = X"09" OR WS-C = X"0A" OR WS-C = X"0D"
ADD 1 TO WS-P
ELSE
EXIT PERFORM
END-IF
END-PERFORM.
*> -------------------------------------------------------------------
TAKE-VALUE.
MOVE WS-VAL-TYPE TO JS-TYPE
MOVE WS-VAL-START TO JS-VSTART
MOVE WS-VAL-END TO JS-VEND
IF WS-VAL-TYPE = "S"
MOVE WS-VAL-START TO WS-P
PERFORM READ-STRING
MOVE WS-STR TO JS-VALUE
MOVE WS-STR-LEN TO JS-VALUE-LEN
ELSE
COMPUTE WS-LEN = WS-VAL-END - WS-VAL-START + 1
IF WS-LEN > 1024
MOVE 1024 TO WS-LEN
END-IF
IF WS-LEN > 0
MOVE JSON-TEXT(WS-VAL-START:WS-LEN) TO JS-VALUE
MOVE WS-LEN TO JS-VALUE-LEN
END-IF
END-IF.
*> -------------------------------------------------------------------
*> Classify the value at WS-P and step past it. Objects and arrays are
*> walked with a depth counter that is blind inside string literals, so
*> a brace in a street name cannot close the object early.
SCAN-VALUE.
IF WS-P > JS-TO
MOVE "E" TO WS-VAL-TYPE
EXIT PARAGRAPH
END-IF
MOVE JSON-TEXT(WS-P:1) TO WS-C
EVALUATE TRUE
WHEN WS-C = CONST-QUOTE
MOVE "S" TO WS-VAL-TYPE
PERFORM SKIP-STRING
WHEN WS-C = "{"
MOVE "O" TO WS-VAL-TYPE
PERFORM SKIP-NESTED
WHEN WS-C = "["
MOVE "A" TO WS-VAL-TYPE
PERFORM SKIP-NESTED
WHEN WS-C = "t" OR WS-C = "f"
MOVE "B" TO WS-VAL-TYPE
PERFORM SKIP-BARE
WHEN WS-C = "n"
MOVE "Z" TO WS-VAL-TYPE
PERFORM SKIP-BARE
WHEN OTHER
MOVE "N" TO WS-VAL-TYPE
PERFORM SKIP-BARE
END-EVALUATE.
*> -------------------------------------------------------------------
SKIP-BARE.
PERFORM UNTIL WS-P > JS-TO
MOVE JSON-TEXT(WS-P:1) TO WS-C
IF WS-C = "," OR WS-C = "}" OR WS-C = "]"
OR WS-C = SPACE OR WS-C = X"09" OR WS-C = X"0A" OR WS-C = X"0D"
EXIT PERFORM
END-IF
ADD 1 TO WS-P
END-PERFORM.
*> -------------------------------------------------------------------
SKIP-STRING.
ADD 1 TO WS-P
PERFORM UNTIL WS-P > JS-TO
MOVE JSON-TEXT(WS-P:1) TO WS-C
IF WS-C = CONST-BACKSLASH
ADD 2 TO WS-P
ELSE
ADD 1 TO WS-P
IF WS-C = CONST-QUOTE
EXIT PERFORM
END-IF
END-IF
END-PERFORM.
*> -------------------------------------------------------------------
SKIP-NESTED.
MOVE 0 TO WS-DEPTH
MOVE "N" TO WS-IN-STRING
PERFORM UNTIL WS-P > JS-TO
MOVE JSON-TEXT(WS-P:1) TO WS-C
IF WS-IN-STRING = "Y"
IF WS-C = CONST-BACKSLASH
ADD 2 TO WS-P
ELSE
IF WS-C = CONST-QUOTE
MOVE "N" TO WS-IN-STRING
END-IF
ADD 1 TO WS-P
END-IF
ELSE
EVALUATE TRUE
WHEN WS-C = CONST-QUOTE
MOVE "Y" TO WS-IN-STRING
ADD 1 TO WS-P
WHEN WS-C = "{" OR WS-C = "["
ADD 1 TO WS-DEPTH
ADD 1 TO WS-P
WHEN WS-C = "}" OR WS-C = "]"
SUBTRACT 1 FROM WS-DEPTH
ADD 1 TO WS-P
WHEN OTHER
ADD 1 TO WS-P
END-EVALUATE
IF WS-DEPTH <= 0
EXIT PERFORM
END-IF
END-IF
END-PERFORM.
*> -------------------------------------------------------------------
*> Read the string literal starting at WS-P into WS-STR, decoding the
*> escapes, and leave WS-P just past the closing quote.
READ-STRING.
MOVE SPACES TO WS-STR
MOVE 0 TO WS-STR-LEN
ADD 1 TO WS-P
PERFORM UNTIL WS-P > JS-TO
MOVE JSON-TEXT(WS-P:1) TO WS-C
IF WS-C = CONST-QUOTE
ADD 1 TO WS-P
EXIT PERFORM
END-IF
IF WS-C = CONST-BACKSLASH
ADD 1 TO WS-P
IF WS-P > JS-TO
EXIT PERFORM
END-IF
MOVE JSON-TEXT(WS-P:1) TO WS-D
EVALUATE WS-D
WHEN "n"
MOVE X"0A" TO WS-C
PERFORM APPEND-CHAR
ADD 1 TO WS-P
WHEN "t"
MOVE X"09" TO WS-C
PERFORM APPEND-CHAR
ADD 1 TO WS-P
WHEN "r"
MOVE X"0D" TO WS-C
PERFORM APPEND-CHAR
ADD 1 TO WS-P
WHEN "b"
MOVE X"08" TO WS-C
PERFORM APPEND-CHAR
ADD 1 TO WS-P
WHEN "f"
MOVE X"0C" TO WS-C
PERFORM APPEND-CHAR
ADD 1 TO WS-P
WHEN "u"
PERFORM APPEND-UNICODE
WHEN OTHER
MOVE WS-D TO WS-C
PERFORM APPEND-CHAR
ADD 1 TO WS-P
END-EVALUATE
ELSE
PERFORM APPEND-CHAR
ADD 1 TO WS-P
END-IF
END-PERFORM.
*> -------------------------------------------------------------------
APPEND-CHAR.
IF WS-STR-LEN < 1024
ADD 1 TO WS-STR-LEN
MOVE WS-C TO WS-STR(WS-STR-LEN:1)
END-IF.
*> -------------------------------------------------------------------
*> WS-P sits on the "u" of a \uXXXX escape. Decode it, join it with the
*> escape that follows when the two form a surrogate pair, and append the
*> UTF-8 bytes.
APPEND-UNICODE.
ADD 1 TO WS-P
MOVE 0 TO WS-CODE
PERFORM READ-HEX-4
IF WS-HEX-OK NOT = "Y"
EXIT PARAGRAPH
END-IF
IF WS-CODE >= 55296 AND WS-CODE <= 56319
IF WS-P + 5 <= JS-TO
AND JSON-TEXT(WS-P:1) = CONST-BACKSLASH
AND JSON-TEXT(WS-P + 1:1) = "u"
MOVE WS-CODE TO WS-LOW
ADD 2 TO WS-P
MOVE 0 TO WS-CODE
PERFORM READ-HEX-4
IF WS-HEX-OK = "Y" AND WS-CODE >= 56320 AND WS-CODE <= 57343
COMPUTE WS-CODE =
65536 + (WS-LOW - 55296) * 1024 + (WS-CODE - 56320)
END-IF
END-IF
END-IF
PERFORM EMIT-UTF8.
*> -------------------------------------------------------------------
READ-HEX-4.
MOVE "Y" TO WS-HEX-OK
PERFORM VARYING WS-I FROM 1 BY 1 UNTIL WS-I > 4
IF WS-P > JS-TO
MOVE "N" TO WS-HEX-OK
EXIT PERFORM
END-IF
MOVE JSON-TEXT(WS-P:1) TO WS-D
EVALUATE TRUE
WHEN WS-D >= "0" AND WS-D <= "9"
COMPUTE WS-NIB = FUNCTION ORD(WS-D) - FUNCTION ORD("0")
WHEN WS-D >= "a" AND WS-D <= "f"
COMPUTE WS-NIB = FUNCTION ORD(WS-D) - FUNCTION ORD("a") + 10
WHEN WS-D >= "A" AND WS-D <= "F"
COMPUTE WS-NIB = FUNCTION ORD(WS-D) - FUNCTION ORD("A") + 10
WHEN OTHER
MOVE "N" TO WS-HEX-OK
EXIT PERFORM
END-EVALUATE
COMPUTE WS-CODE = WS-CODE * 16 + WS-NIB
ADD 1 TO WS-P
END-PERFORM.
*> -------------------------------------------------------------------
EMIT-UTF8.
EVALUATE TRUE
WHEN WS-CODE < 128
MOVE FUNCTION CHAR(WS-CODE + 1) TO WS-C
PERFORM APPEND-CHAR
WHEN WS-CODE < 2048
DIVIDE WS-CODE BY 64 GIVING WS-B1 REMAINDER WS-B2
COMPUTE WS-B1 = 192 + WS-B1
COMPUTE WS-B2 = 128 + WS-B2
MOVE FUNCTION CHAR(WS-B1 + 1) TO WS-C
PERFORM APPEND-CHAR
MOVE FUNCTION CHAR(WS-B2 + 1) TO WS-C
PERFORM APPEND-CHAR
WHEN WS-CODE < 65536
DIVIDE WS-CODE BY 4096 GIVING WS-B1 REMAINDER WS-REST
DIVIDE WS-REST BY 64 GIVING WS-B2 REMAINDER WS-B3
COMPUTE WS-B1 = 224 + WS-B1
COMPUTE WS-B2 = 128 + WS-B2
COMPUTE WS-B3 = 128 + WS-B3
MOVE FUNCTION CHAR(WS-B1 + 1) TO WS-C
PERFORM APPEND-CHAR
MOVE FUNCTION CHAR(WS-B2 + 1) TO WS-C
PERFORM APPEND-CHAR
MOVE FUNCTION CHAR(WS-B3 + 1) TO WS-C
PERFORM APPEND-CHAR
WHEN OTHER
DIVIDE WS-CODE BY 262144 GIVING WS-B1 REMAINDER WS-REST
DIVIDE WS-REST BY 4096 GIVING WS-B2 REMAINDER WS-Q
DIVIDE WS-Q BY 64 GIVING WS-B3 REMAINDER WS-B4
COMPUTE WS-B1 = 240 + WS-B1
COMPUTE WS-B2 = 128 + WS-B2
COMPUTE WS-B3 = 128 + WS-B3
COMPUTE WS-B4 = 128 + WS-B4
MOVE FUNCTION CHAR(WS-B1 + 1) TO WS-C
PERFORM APPEND-CHAR
MOVE FUNCTION CHAR(WS-B2 + 1) TO WS-C
PERFORM APPEND-CHAR
MOVE FUNCTION CHAR(WS-B3 + 1) TO WS-C
PERFORM APPEND-CHAR
MOVE FUNCTION CHAR(WS-B4 + 1) TO WS-C
PERFORM APPEND-CHAR
END-EVALUATE.
END PROGRAM CEPIS-JSON-GET.
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