added string.findstr(). string.find() returns 255 if not found.

also fix string assignment bug for sub args.

compiler/res/prog8lib/shared_string_functions.p8

@@ -76,4 +76,44 @@ string {
         return s+cx16.r0L
     }
 
+    sub startswith(str st, str prefix) -> bool {
+        ubyte prefix_len = string.length(prefix)
+        ubyte str_len = string.length(st)
+        if prefix_len > str_len
+            return false
+        cx16.r9L = st[prefix_len]
+        st[prefix_len] = 0
+        cx16.r9H = string.compare(st, prefix) as ubyte
+        st[prefix_len] = cx16.r9L
+        return cx16.r9H==0
+    }
+
+    sub endswith(str st, str suffix) -> bool {
+        ubyte suffix_len = string.length(suffix)
+        ubyte str_len = string.length(st)
+        if suffix_len > str_len
+            return false
+        return string.compare(st + str_len - suffix_len, suffix) == 0
+    }
+
+    sub findstr(str haystack, str needle) -> ubyte {
+        ; searches for needle in haystack.
+        ; returns index in haystack where it first occurs, and Carry set,
+        ; or if needle doesn't occur in haystack it returns Carry clear and 255 (an invalid index.)
+        cx16.r2L = string.length(haystack)
+        cx16.r3L = string.length(needle)
+        if cx16.r3L <= cx16.r2L {
+            cx16.r2L = cx16.r2L-cx16.r3L+1
+            cx16.r3 = haystack
+            repeat cx16.r2L {
+                if string.startswith(cx16.r3, needle) {
+                    sys.set_carry()
+                    return cx16.r3-haystack as ubyte
+                }
+                cx16.r3++
+            }
+        }
+        sys.clear_carry()
+        return 255
+    }
 }

compiler/res/prog8lib/string.p8

@@ -129,7 +129,7 @@ _startloop	dey
 
     asmsub find(uword string @AY, ubyte character @X) -> ubyte @A, bool @Pc {
         ; Locates the first position of the given character in the string,
-        ; returns Carry set if found + index in A, or A=0 + Carry clear if not found.
+        ; returns Carry set if found + index in A, or Carry clear if not found (and A will be 255, an invalid index).
         %asm {{
 		; need to copy the the cx16 virtual registers to zeropage to make this run on C64...
 		sta  P8ZP_SCRATCH_W1
@@ -142,7 +142,7 @@ _startloop	dey
 		beq  _found
 		iny
 		bne  -
-_notfound	lda  #0
+_notfound	lda  #255
         clc
 		rts
 _found	tya
@@ -277,26 +277,6 @@ _done       rts
         }}
     }
 
-    sub startswith(str st, str prefix) -> bool {
-        ubyte prefix_len = length(prefix)
-        ubyte str_len = length(st)
-        if prefix_len > str_len
-            return false
-        cx16.r9L = st[prefix_len]
-        st[prefix_len] = 0
-        cx16.r9H = compare(st, prefix) as ubyte
-        st[prefix_len] = cx16.r9L
-        return cx16.r9H==0
-    }
-
-    sub endswith(str st, str suffix) -> bool {
-        ubyte suffix_len = length(suffix)
-        ubyte str_len = length(st)
-        if suffix_len > str_len
-            return false
-        return compare(st + str_len - suffix_len, suffix) == 0
-    }
-
     asmsub pattern_match(str string @AY, str pattern @R0) clobbers(Y) -> bool @A {
 		%asm {{
 ; pattern matching of a string.
@@ -366,7 +346,6 @@ fail    clc             ; yes, no match found, return with c=0
 		}}
 	}
 
-
     asmsub hash(str string @R0) -> ubyte @A {
         ; experimental 8 bit hashing function.
         ; hash(-1)=179;  clear carry;  hash(i) = ROL hash(i-1)  XOR  string[i]

compiler/res/prog8lib/virtual/string.p8

@@ -55,7 +55,7 @@ string {
 
     sub find(str st, ubyte character) -> ubyte {
         ; Locates the first position of the given character in the string,
-        ; returns Carry set if found + index in A, or Carry clear if not found.
+        ; returns Carry set if found + index in A, or Carry clear if not found (and A will be 255, an invalid index).
         ubyte ix
         for ix in 0 to length(st)-1 {
             if st[ix]==character {
@@ -64,7 +64,7 @@ string {
             }
         }
         sys.clear_carry()
-        return 0
+        return 255
     }
 
     sub contains(str st, ubyte character) -> bool {
@@ -147,26 +147,6 @@ string {
         return char
     }
 
-    sub startswith(str st, str prefix) -> bool {
-        ubyte prefix_len = length(prefix)
-        ubyte str_len = length(st)
-        if prefix_len > str_len
-            return false
-        cx16.r9L = st[prefix_len]
-        st[prefix_len] = 0
-        cx16.r9H = compare(st, prefix) as ubyte
-        st[prefix_len] = cx16.r9L
-        return cx16.r9H==0
-    }
-
-    sub endswith(str st, str suffix) -> bool {
-        ubyte suffix_len = length(suffix)
-        ubyte str_len = length(st)
-        if suffix_len > str_len
-            return false
-        return compare(st + str_len - suffix_len, suffix) == 0
-    }
-
     sub hash(str st) -> ubyte {
         ; experimental 8 bit hashing function.
         ; hash(-1)=179;  hash(i) = ROL hash(i-1)  XOR  string[i]

compiler/src/prog8/compiler/astprocessing/StatementReorderer.kt

@@ -214,8 +214,12 @@ internal class StatementReorderer(
             }
         }
 
-        if(valueType.isString && (targetType istype DataType.STR || targetType istype DataType.ARRAY_B || targetType istype DataType.ARRAY_UB))
+        if(!assignment.isAugmentable) {
+            if (valueType.isString && (targetType istype DataType.STR || targetType istype DataType.ARRAY_B || targetType istype DataType.ARRAY_UB)) {
+                // replace string assignment by a call to stringcopy
                 return copyStringValue(assignment)
+            }
+        }
 
         return noModifications
     }

docs/source/syntaxreference.rst

@@ -238,7 +238,6 @@ Directives
     Level: not at module scope.
     Declares that a piece of *assembly code* is inside the curly braces.
     This code will be copied as-is into the generated output assembly source file.
-    The assembler syntax used should be for the 3rd party cross assembler tool that Prog8 uses (64tass).
     Note that the start and end markers are both *double curly braces* to minimize the chance
     that the assembly code itself contains either of those. If it does contain a ``}}``,
     it will confuse the parser.
@@ -247,6 +246,9 @@ Directives
     the assembly code. Sometimes you'll have to declare a variable in prog8 with `@shared` if it
     is only used in such assembly code.
 
+    .. note::
+        64tass syntax is required for the assembly code. As such, mnemonics need to be written in lowercase.
+
     .. caution::
         Avoid using single-letter symbols in included assembly code, as they could be confused with CPU registers.
         Also, note that all prog8 symbols are prefixed in assembly code, see :ref:`symbol-prefixing`.

examples/test.p8

@@ -1,22 +1,78 @@
 %import textio
+%import string
 %zeropage basicsafe
-%option no_sysinit
 
 main {
     sub start() {
-        ubyte[] ubarray = [11,22,33]
+        str name = "irmen@de@jong"
-        uword[] uwarray = [1111,2222,3333]
+        cx16.r0L = findstr(name, "de-")
-        uword[] @split suwarray = [1111,2222,3333]
+        if_cs {
-
+            txt.print("found1. error. ")
-        ubarray[1] *= 10
+        } else {
-        uwarray[1] *= 10
+            txt.print("not found1. ok ")
-        suwarray[1] *= 10
+        }
-
+        txt.print_ub(cx16.r0L)
-        txt.print_ub(ubarray[1])
         txt.nl()
-        txt.print_uw(uwarray[1])
         txt.nl()
-        txt.print_uw(suwarray[1])
+        cx16.r0L = findstr(name, "de@")
+        if_cs {
+            txt.print("found2 (6?). ")
+        } else {
+            txt.print("not found2. error ")
+        }
+        txt.print_ub(cx16.r0L)
+        txt.nl()
+        txt.nl()
+        cx16.r0L = findstr(name, "irmen@de@jong")
+        if_cs {
+            txt.print("found3 (0?). ")
+        } else {
+            txt.print("not found3. error ")
+        }
+        txt.print_ub(cx16.r0L)
+        txt.nl()
+        txt.nl()
+        cx16.r0L = findstr(name, "irmen@de@jong1")
+        if_cs {
+            txt.print("found4. error. ")
+        } else {
+            txt.print("not found4. ok ")
+        }
+        txt.print_ub(cx16.r0L)
+        txt.nl()
+        txt.nl()
+        cx16.r0L = findstr(name, "jong")
+        if_cs {
+            txt.print("found5 (9?). ")
+        } else {
+            txt.print("not found5. error ")
+        }
+        txt.print_ub(cx16.r0L)
+        txt.nl()
         txt.nl()
     }
+
+    sub findstr(str haystack, str needle) -> ubyte {
+        ; searches for needle in haystack.
+        ; returns index in haystack where it first occurs, and Carry set,
+        ; or if needle doesn't occur in haystack it returns Carry clear and 255 (an invalid index.)
+        txt.print_uwhex(haystack, true)
+        txt.spc()
+        txt.print(haystack)
+        txt.nl()
+        cx16.r2L = string.length(haystack)
+        cx16.r3L = string.length(needle)
+        if cx16.r3L <= cx16.r2L {
+            cx16.r2L = cx16.r2L-cx16.r3L+1
+            repeat cx16.r2L {
+                if string.startswith(haystack, needle) {
+                    sys.set_carry()
+                    return 13 as ubyte
+                }
+                haystack++
+            }
+        }
+        sys.clear_carry()
+        return 255
+    }
 }

gradle.properties

@@ -5,4 +5,4 @@ org.gradle.daemon=true
 kotlin.code.style=official
 javaVersion=11
 kotlinVersion=1.9.22
-version=10.2
+version=10.3-SNAPSHOT