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path: root/amforth-6.5/common/words/recognize.asm
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Diffstat (limited to 'amforth-6.5/common/words/recognize.asm')
-rw-r--r--amforth-6.5/common/words/recognize.asm73
1 files changed, 73 insertions, 0 deletions
diff --git a/amforth-6.5/common/words/recognize.asm b/amforth-6.5/common/words/recognize.asm
new file mode 100644
index 0000000..2dc9690
--- /dev/null
+++ b/amforth-6.5/common/words/recognize.asm
@@ -0,0 +1,73 @@
+; (addr len recstack -- i*x dt:token | dt:null )
+; System
+; walk the recognizer stack
+
+.if cpu_msp430==1
+ HEADER(XT_RECOGNIZE,9,"recognize",DOCOLON)
+.endif
+
+.if cpu_avr8==1
+VE_RECOGNIZE:
+ .dw $ff09
+ .db "recognize",0
+ .dw VE_HEAD
+ .set VE_HEAD = VE_RECOGNIZE
+XT_RECOGNIZE:
+ .dw DO_COLON
+PFA_RECOGNIZE:
+.endif
+ .dw XT_DOLITERAL
+ .dw XT_RECOGNIZE_A
+ .dw XT_SWAP
+ .dw XT_MAPSTACK
+ .dw XT_ZEROEQUAL
+ .dw XT_DOCONDBRANCH
+ DEST(PFA_RECOGNIZE1)
+ .dw XT_2DROP
+ .dw XT_DT_NULL
+PFA_RECOGNIZE1:
+ .dw XT_EXIT
+
+.if cpu_msp430==1
+ HEADLESS(XT_RECOGNIZE_A,DOCOLON)
+.endif
+
+.if cpu_avr8==1
+; ( addr len XT -- addr len [ dt:xt -1 | 0 ] )
+XT_RECOGNIZE_A:
+ .dw DO_COLON
+PFA_RECOGNIZE_A:
+.endif
+ .dw XT_ROT ; -- len xt addr
+ .dw XT_ROT ; -- xt addr len
+ .dw XT_2DUP
+ .dw XT_2TO_R
+ .dw XT_ROT ; -- addr len xt
+ .dw XT_EXECUTE ; -- i*x dt:* | dt:null
+ .dw XT_2R_FROM
+ .dw XT_ROT
+ .dw XT_DUP
+ .dw XT_DT_NULL
+ .dw XT_EQUAL
+ .dw XT_DOCONDBRANCH
+ DEST(PFA_RECOGNIZE_A1)
+ .dw XT_DROP
+ .dw XT_ZERO
+ .dw XT_EXIT
+PFA_RECOGNIZE_A1:
+ .dw XT_NIP
+ .dw XT_NIP
+ .dw XT_TRUE
+ .dw XT_EXIT
+
+; : recognize ( addr len stack-id -- i*x dt:* | dt:null )
+; [: ( addr len -- addr len 0 | i*x dt:* -1 )
+; rot rot 2dup 2>r rot execute 2r> rot
+; dup dt:null = ( -- addr len dt:* f )
+; if drop 0 else nip nip -1 then
+; ;]
+; map-stack ( -- i*x addr len dt:* f )
+; 0= if \ a recognizer did the job, remove addr/len
+; 2drop dt:null
+; then ;
+;