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# -*- coding: utf-8 -*-
#
# AWL simulator - IEC library - FC 4 "DELETE"
#
# Copyright 2015 Michael Buesch <m@bues.ch>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
from __future__ import division, absolute_import, print_function, unicode_literals
from awlsim.common.compat import *
from awlsim.library.libentry import *
class Lib__IEC__FC4_DELETE(AwlLibFC):
libraryName = "IEC"
staticIndex = 4
symbolName = "DELETE"
description = "Delete STRING characters"
interfaceFields = {
BlockInterfaceField.FTYPE_IN : (
VerboseBlockIntfField(name = "IN",
dataType = AwlDataType.makeByName("STRING"),
desc = "Input string"),
VerboseBlockIntfField(name = "L",
dataType = AwlDataType.makeByName("INT"),
desc = "Number of characters to delete"),
VerboseBlockIntfField(name = "P",
dataType = AwlDataType.makeByName("INT"),
desc = "Position of first character to delete"),
),
BlockInterfaceField.FTYPE_OUT : (
VerboseBlockIntfField(name = "RET_VAL",
dataType = AwlDataType.makeByName("STRING"),
desc = "Output string"),
),
BlockInterfaceField.FTYPE_TEMP : (
VerboseBlockIntfField(name = "AR1_SAVE",
dataType = AwlDataType.makeByName("DWORD"),
desc = "Saved AR1 register"),
VerboseBlockIntfField(name = "MAX_COPY_LEN",
dataType = AwlDataType.makeByName("INT"),
desc = "Maximum number of characters to copy"),
VerboseBlockIntfField(name = "IN_END",
dataType = AwlDataType.makeByName("DWORD"),
desc = "Pointer beyond end of #IN string"),
VerboseBlockIntfField(name = "DEL_START",
dataType = AwlDataType.makeByName("DWORD"),
desc = "Pointer to first deleted character in #IN"),
VerboseBlockIntfField(name = "DEL_END",
dataType = AwlDataType.makeByName("DWORD"),
desc = "Pointer beyond last deleted character in #IN"),
VerboseBlockIntfField(name = "RET_VAL_START",
dataType = AwlDataType.makeByName("DWORD"),
desc = "Pointer to start of #RET_VAL"),
),
}
awlCodeCopyright = "Copyright (c) 2015 Michael Buesch <m@bues.ch>"
awlCodeLicense = "BSD-2-clause"
awlCodeIsStandard = True
awlCodeVersion = "0.1"
awlCode = """
TAR1 #AR1_SAVE // Save AR1 register
// ---------------------------------------------------------------------------
// Load a pointer to #IN into AR1 and open the DB
LAR1 P##IN // AR1 := pointer to #IN DB-pointer.
L W [AR1, P#0.0] // Get the DB number from the DB-pointer.
T #MAX_COPY_LEN // Abuse #MAX_COPY_LEN variable temporarily.
AUF DB [#MAX_COPY_LEN] // Open the DB.
L D [AR1, P#2.0] // Get the actual #IN data pointer...
LAR1 // and store it in AR1.
// ---------------------------------------------------------------------------
// Load a pointer to #RET_VAL into AR2 and open the DB as DI
LAR2 P##RET_VAL // AR1 := pointer to #RET_VAL DB-pointer.
L W [AR2, P#0.0] // Get the DB number from the DB-pointer.
T #MAX_COPY_LEN // Abuse #MAX_COPY_LEN variable temporarily.
AUF DI [#MAX_COPY_LEN] // Open the DB as DI.
L D [AR2, P#2.0] // Get the actual #RET_VAL data pointer.
// If #RET_VAL points to DB (area 84) change it to DI (area 85).
// This also works, if #RET_VAL points to VL (area 87).
// Other areas are not possible.
OD DW#16#85000000
LAR2 // Store #RET_VAL data pointer in AR2.
T #RET_VAL_START // And also in #RET_VAL_START for later use.
// ---------------------------------------------------------------------------
// Calculate a pointer to the end of #IN.
// #IN_END is a pointer beyond the last character if #IN.
CEND: L B [AR1, P#1.0] // Get actual length of #IN.
+ 2 // Plus two bytes (max-len and act-len bytes).
SLD 3 // Convert to pointer format.
TAR1 // Accu1 := pointer to #IN string.
+D // Add #IN pointer to length.
T #IN_END // This is our end-pointer #IN_END.
// ---------------------------------------------------------------------------
// Check if #L or #P is negative.
L #L
L #P
OW // Combine #L with #P (bitwise OR).
UW W#16#8000 // Mask out sign bit.
SPN ERR // Jump, if sign bit is set.
// ---------------------------------------------------------------------------
// Calculate the maximum number of characters to copy.
// Pseudo code:
// #MAX_COPY_LEN := MIN(ACTUAL_LEN(#IN), MAX_LEN(#RET_VAL))
L B [AR2, P#0.0] // Get #RET_VAL maximum length.
T #MAX_COPY_LEN // Save this as the maximum copy length.
L B [AR1, P#1.0] // Get #IN actual length.
<=I // If #RET_VAL max-len > #IN act-len...
SPB ZCHK
T #MAX_COPY_LEN // ...save #IN act-len as maximum copy length.
// ---------------------------------------------------------------------------
// If #L or #P is zero or #P is bigger than the actual
// length of #IN, copy the whole #IN to #RET_VAL.
ZCHK: L #L
OW W#16#0 // Evaluate value of #L (sets A0/A1 STW).
SPZ FCPY // Jump to full copy, if L# is zero (/A0 * /A1).
L #P
OW W#16#0 // Evaluate value of #P (sets A0/A1 STW).
SPZ FCPY // Jump to full copy, if P# is zero (/A0 * /A1).
L #MAX_COPY_LEN
>I // If P# > #MAX_COPY_LEN ...
SPB FCPY // ...jump to full copy.
// ---------------------------------------------------------------------------
// Calculate the start and the end of the deleted area.
// #DEL_START is a pointer to the first deleted character.
// #DEL_END is a pointer beyond the last deleted character.
TAR1 // Accu1 := pointer to #IN string.
L #P // Get the delete position.
+ 1 // Make zero based (-1) and skip to first character (+2).
SLD 3 // Convert to pointer format.
+D // Add it to the #IN pointer.
T #DEL_START // This is our #DEL_START pointer.
L #L // Get the delete count (# of chars).
SLD 3 // Convert to pointer format.
+D // Add it to #DEL_START.
T #DEL_END // This is our #DEL_END.
L #IN_END // Compare #DEL_END to #IN_END.
<=D // If #DEL_END is beyond our #IN string length...
SPB SNIP // (can happen if #P + #L is too big)
T #DEL_END // ...use #IN_END as our #DEL_END.
// ---------------------------------------------------------------------------
// Restrict #DEL_START and #IN_END to the maximum number
// of characters to copy.
// First check (pseudo code):
// LIMIT := #IN_PTR + ((#MAX_COPY_LEN + 2) << 3)
// IF (#DEL_START > LIMIT) THEN
// #DEL_START := LIMIT
// #DEL_END := LIMIT
// ENDIF
SNIP: TAR1 // Accu1 := pointer to #IN string.
L #MAX_COPY_LEN // Get maximum copy length.
+ 2 // Add two for max-len and act-len bytes.
SLD 3 // Convert to pointer format.
+D // Add to #IN pointer.
L #DEL_START // Compare to #DEL_START.
>=D
SPB SNP2 // Jump, if bigger or equal.
TAK // Save computed value as #DEL_START and #DEL_END.
T #DEL_START
T #DEL_END
// Second check (pseudo code):
// LIMIT := #IN_PTR + ((#MAX_COPY_LEN + 2) << 3) + (#DEL_END - #DEL_START)
// IF (#IN_END > LIMIT) THEN
// #IN_END := LIMIT
// ENDIF
SNP2: L #DEL_END // Subtract #DEL_START from #DEL_END.
L #DEL_START
-D
L #MAX_COPY_LEN // Get maximum copy length.
+ 2 // Add two for max-len and act-len bytes.
SLD 3 // Convert to pointer format.
+D // Add to computed del range.
TAR1 // Accu1 := pointer to #IN string.
+D // Add #IN pointer to computed value.
L #IN_END // Compare to #IN_END.
>=D
SPB SKIP // Jump, if bigger or equal.
TAK // Save computed value as #IN_END.
T #IN_END
// ---------------------------------------------------------------------------
// Skip the max-len and actual-len bytes in #IN and #RET_VAL.
// This makes both pointers point to the first character.
SKIP: +AR1 P#2.0 // Skip 2 bytes in #IN string.
+AR2 P#2.0 // Skip 2 bytes in #RET_VAL string.
// ---------------------------------------------------------------------------
// Copy the first part of the string from #IN to #RET_VAL.
// (The part before the deleted section)
CPY1: TAR1 // Accu1 := pointer to #IN string.
L #DEL_START // Get the end of the first copy chunk.
>=D // If current pointer is beyond end of chunk...
SPB DEL // ...jump to second chunk (the part after del).
L B [AR1, P#0.0] // Get one character from #IN.
T B [AR2, P#0.0] // Put the character to #RET_VAL.
+AR1 P#1.0 // Increment #IN pointer.
+AR2 P#1.0 // Increment #RET_VAL pointer.
SPA CPY1 // Jump back to first copy loop start.
// ---------------------------------------------------------------------------
// Copy the second part of the string from #IN to #RET_VAL.
// (The part after the deleted section)
DEL: LAR1 #DEL_END // AR1 := pointer to second chunk of #IN string.
CPY2: TAR1 // Accu1 := pointer to #IN string.
L #IN_END // Get the end of the second copy chunk.
>=D // If current pointer is beyond end of chunk...
SPB WLEN // ...we are done and jump to writing the length.
L B [AR1, P#0.0] // Get one character from #IN.
T B [AR2, P#0.0] // Put the character to #RET_VAL.
+AR1 P#1.0 // Increment #IN pointer.
+AR2 P#1.0 // Increment #RET_VAL pointer.
SPA CPY2 // Jump back to second copy loop start.
// ---------------------------------------------------------------------------
// Write #RET_VAL actual length
// Calculate it from AR2.
// AR2 currently points one character beyond the #RET_VAL string.
// (So it represents the actual length of the string.)
WLEN: TAR2 // Accu1 := #RET_VAL pointer (AR2).
L #RET_VAL_START // Get the start pointer to the #RET_VAL string.
LAR2 // Save the start pointer (for later use) in AR2.
-D // Subtract #RET_VAL start pointer from actual pointer.
SRD 3 // Convert from pointer format to byte count.
+ -2 // Subtract two bytes (max-len and actual-len bytes).
T B [AR2, P#1.0] // We have the #RET_VAL actual length. Store it in #RET_VAL.
// ---------------------------------------------------------------------------
// Everything is Ok.
SET // VKE := 1
SAVE // BIE := 1
END: LAR1 #AR1_SAVE // Restore AR1 register
// ---------------------------------------------------------------------------
BEA // BLOCK END
// ---------------------------------------------------------------------------
// ---------------------------------------------------------------------------
// Do a full copy of all #IN characters to #RET_VAL.
// Set #DEL_START and #DEL_END to #IN string end (that is #IN_END),
// so nothing will get deleted.
FCPY: L #IN_END
T #DEL_START
T #DEL_END
SPA SNIP // Jump to the copying routine.
// ---------------------------------------------------------------------------
// Input value error handler (#P or #L have invalid values).
ERR: L 0
T B [AR2, P#1.0] // #RET_VAL actual string length := 0
CLR // VKE := 0
SAVE // BIE := 0
SPA END
// ---------------------------------------------------------------------------
BE // BLOCK END
"""
AwlLib.registerEntry(Lib__IEC__FC4_DELETE)
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