Start on assembly target

.gitignore

@@ -1,3 +1,4 @@
 /it0-out0.diff
 /it1-out*
 /it2-out*
+/it3-out*

Makefile

@@ -1,36 +1,70 @@
-TEE :=
+.SUFFIXES:
 
 GCC_FLAGS := -g -O0 -Wall
 
-run: it1 it2
 
-it0:
-	echo "Hand made"
 
-it1:
+all: it2-out
-	cat it1-in.lang0 | python3 it0-out.py $(if $(TEE),| tee,> ) it1-out0.py
 
-	cat it1-in.lang0 | python3 it1-out0.py $(if $(TEE),| tee,> ) it1-out1.py
-	diff it1-out0.py it1-out1.py > it1-out1.diff
-	cat it1-in.lang0 | python3 it1-out1.py $(if $(TEE),| tee,> ) it1-out2.py
-	diff it1-out1.py it1-out2.py > it1-out2.diff
-	cat it1-in.lang0 | python3 it1-out2.py $(if $(TEE),| tee,> ) it1-out.py
-	diff it1-out2.py it1-out.py > it1-out.diff
 
-	# See how much our hand written code differs from resulting code
-	-diff it0-out.py it1-out0.py > it0-out0.diff
 
-it2: it1
+# it0-out.py => Hand made
-	cat it2-in.lang0 | python3 it1-out.py $(if $(TEE),| tee,> ) it2-out0.py
+
+
+
+it1-out0.py: it0-out.py it1-in.lang0
+	cat it1-in.lang0 | python3 it0-out.py > it1-out0.py
+
+it1-out1.py: it1-out0.py it1-in.lang0
+	cat it1-in.lang0 | python3 it1-out0.py > it1-out1.py
+# We can diff here since the target hasn't changed
+# The target for it0 is the same as for it1
+	diff it1-out0.py it1-out1.py
+
+it1-out2.py: it1-out1.py it1-in.lang0
+	cat it1-in.lang0 | python3 it1-out1.py > it1-out2.py
+	diff it1-out1.py it1-out2.py
+
+it1-out3.py: it1-out2.py it1-in.lang0
+	cat it1-in.lang0 | python3 it1-out2.py > it1-out3.py
+	diff it1-out2.py it1-out3.py
+
+it1-out.py: it1-out3.py
+	cp it1-out3.py it1-out.py
+
+
+
+it2-out0.py: it1-out.py it2-in.lang0
+	cat it2-in.lang0 | python3 it1-out.py > it2-out0.py
+
+# No gcc step since the target is still python here
+
+it2-out1.c: it2-out0.py it2-in.lang0
+	cat it2-in.lang0 | python3 it2-out0.py > it2-out1.c
+# 	diff it2-out0.py it2-out1.py Do not diff - the target changed so the output will be different
+
+it2-out1: it2-out1.c
+	gcc it2-out1.c -o it2-out1 $(GCC_FLAGS)
+
+it2-out2.c: it2-out1 it2-in.lang0
+	cat it2-in.lang0 | ./it2-out1 > it2-out2.c
+	diff it2-out1.c it2-out2.c
+
+it2-out2: it2-out2.c
+	gcc it2-out2.c -o it2-out2 $(GCC_FLAGS)
+
+it2-out3.c: it2-out2 it2-in.lang0
+	cat it2-in.lang0 | ./it2-out2 > it2-out3.c
+	diff it2-out2.c it2-out3.c
+
+it2-out3: it2-out3.c
+	gcc it2-out3.c -o it2-out3 $(GCC_FLAGS)
+
+it2-out: it2-out3
+	cp it2-out3 it2-out
+
 
-	cat it2-in.lang0 | python3 it2-out0.py $(if $(TEE),| tee,> ) it2-out1.c && gcc it2-out1.c -o it2-out1 $(GCC_FLAGS)
-#	diff it2-out0.c it2-out1.c > it2-out1.diff
-	cat it2-in.lang0 | ./it2-out1 $(if $(TEE),| tee,> ) it2-out2.c && gcc it2-out2.c -o it2-out2 $(GCC_FLAGS)
-	diff it2-out1.c it2-out2.c > it2-out2.diff
-	cat it2-in.lang0 | ./it2-out2 $(if $(TEE),| tee,> ) it2-out.c && gcc it2-out.c -o it2-out $(GCC_FLAGS)
-	diff it2-out2.c it2-out.c > it2-out.diff
 
 clean:
 	-rm it1-out* it2-out*
-
+	-rm it1-out* it2-out* it3-out*
-.PHONY: it2

README.md

@@ -154,10 +154,12 @@ How to run
 Install python3 and make
 
 ```sh
-make clean run
+make clean all
 ```
 
 Get more info
 ```
-make TRACE=1 clean run
+make TRACE=1 clean all
 ```
+
+You will now have a lang0 compiler in python for python in `./it1-out.py`, and one written in C for C in `./it2-out`.

it3-in.lang0

@@ -0,0 +1,434 @@
+increaseindent indent:
+	calc indent addstringchar indent " "
+	calc indent addstringchar indent " "
+	calc indent addstringchar indent " "
+	calc indent addstringchar indent " "
+	return indent
+/
+
+lexident:
+	declare char
+	declare isbeforea
+	declare isafterz
+	declare word
+	set word ""
+	forever
+		calc char peek
+		calc isbeforea lt char "a"
+		if isbeforea
+			break
+		/
+		calc isafterz lt "z" char
+		if isafterz
+			break
+		/
+		calc word addstringchar word char
+		skip
+	/
+	return word
+/
+
+parseconststring:
+	declare char
+	declare iseof
+	declare isquote
+	skipchar quote
+	emit quote
+	forever
+		calc char peek
+		calc iseof eq char eof
+		if iseof
+			break
+		/
+		calc isquote eq char quote
+		if isquote
+			break
+		/
+		emit char
+		skip
+	/
+	skipchar quote
+	emit quote
+	return
+/
+
+parseexprvarref:
+	declare varname
+	calc varname lexident
+	emit "var_"
+	emit varname
+	return
+/
+
+parseexprcall:
+	declare char
+	declare first
+	declare funcname
+	declare isspace
+	declare isnotspace
+	declare isfirst
+	declare isnotfirst
+	declare isquote
+	declare isnotquote
+	calc funcname lexident
+	emit funcname
+	emit "("
+	set first "1"
+	forever
+		calc char peek
+		calc isspace eq char " "
+		calc isnotspace not isspace
+		if isnotspace
+			break
+		/
+		skip
+		calc isfirst eq first "1"
+		calc isnotfirst not isfirst
+		if isnotfirst
+			emit ", "
+		/
+		calc char peek
+		calc isquote eq char quote
+		calc isnotquote not isquote
+		if isquote
+			parseconststring
+		/
+		if isnotquote
+			parseexprvarref
+		/
+		set first "0"
+	/
+	emit ")"
+	return
+/
+
+parsestatdeclare indent:
+	declare var
+	skipchar " "
+	calc var lexident
+	emit indent
+	emit "push 0"
+	emit "  ; "
+	emit var
+	emit eol
+	skipchar eol
+	return
+/
+
+parsestatset indent:
+	declare var
+	skipchar " "
+	calc var lexident
+	skipchar " "
+	emit indent
+	emit "var_"
+	emit var
+	emit " = "
+	parseconststring
+	emit ";"
+	emit eol
+	skipchar eol
+	return
+/
+
+parsestatcalc indent:
+	declare var
+	skipchar " "
+	calc var lexident
+	skipchar " "
+	emit indent
+	emit "var_"
+	emit var
+	emit " = "
+	parseexprcall
+	emit ";"
+	emit eol
+	skipchar eol
+	return
+/
+
+parseblock indent/
+
+parsestatif indent:
+	declare indentt
+	skipchar " "
+	emit indent
+	emit "if ( 0 < strlen("
+	parseexprvarref
+	emit ") )\n"
+	emit indent
+	emit "{\n"
+	skipchar eol
+	calc indentt increaseindent indent
+	parseblock indentt
+	emit indent
+	emit "}\n"
+	return
+/
+
+parsestatforever indent:
+	declare indentt
+	emit indent
+	emit "while (1)\n"
+	emit indent
+	emit "{\n"
+	skipchar eol
+	calc indentt increaseindent indent
+	parseblock indentt
+	emit indent
+	emit "}\n"
+	return
+/
+
+parsestatbreak indent:
+	emit indent
+	emit "break;\n"
+	skipchar eol
+	return
+/
+
+parsestatreturn indent:
+	declare char
+	declare isspace
+	declare isnotspace
+	emit indent
+	emit "return "
+	calc char peek
+	calc isspace eq char " "
+	calc isnotspace not isspace
+	if isspace
+		skip
+		parseexprvarref
+	/
+	if isnotspace
+		emit "0"
+	/
+	emit ";"
+	emit eol
+	skipchar eol
+	return
+/
+
+parsestattrace indent:
+	declare varname
+	emit indent
+	emit "trace("
+	emit quote
+	skipchar " "
+	calc varname lexident
+	emit varname
+	emit quote
+	emit ", var_"
+	emit varname
+	emit ");\n"
+	skipchar eol
+	return
+/
+
+parsestat indent:
+	declare call
+	declare char
+	declare first
+	declare iscall
+	declare isfirst
+	declare isspace
+	declare isquote
+	declare isnotfirst
+	declare isnotspace
+	declare isnotquote
+	calc call lexident
+	trace call
+	calc iscall eq call "declare"
+	if iscall
+		parsestatdeclare indent
+		return
+	/
+	calc iscall eq call "set"
+	if iscall
+		parsestatset indent
+		return
+	/
+	calc iscall eq call "calc"
+	if iscall
+		parsestatcalc indent
+		return
+	/
+	calc iscall eq call "if"
+	if iscall
+		parsestatif indent
+		return
+	/
+	calc iscall eq call "forever"
+	if iscall
+		parsestatforever indent
+		return
+	/
+	calc iscall eq call "break"
+	if iscall
+		parsestatbreak indent
+		return
+	/
+	calc iscall eq call "return"
+	if iscall
+		parsestatreturn indent
+		return
+	/
+	calc iscall eq call "trace"
+	if iscall
+		parsestattrace indent
+		return
+	/
+	emit indent
+	emit call
+	emit "("
+	set first "1"
+	forever
+		calc char peek
+		calc isspace eq char " "
+		calc isnotspace not isspace
+		if isnotspace
+			break
+		/
+		skip
+		calc char peek
+		calc isquote eq char quote
+		calc isnotquote not isquote
+		if isquote
+			parseconststring
+		/
+		if isnotquote
+			parseexprvarref
+		/
+		calc isfirst eq first "1"
+		calc isnotfirst not isfirst
+		if isnotfirst
+			emit ", "
+		/
+		set first "0"
+	/
+	skipchar eol
+	emit ");\n"
+	return
+/
+
+parseblock indent:
+	declare char
+	declare copy
+	declare iseol
+	declare isnoteol
+	declare isdone
+	declare iseoblock
+	forever
+		forever
+			calc char peek
+			calc iseol eq char eol
+			calc isnoteol not iseol
+			if isnoteol
+				break
+			/
+			skip
+		/
+		set copy "    "
+		forever
+			calc isdone eq copy indent
+			if isdone
+				break
+			/
+			skipchar "\t"
+			calc copy increaseindent copy
+		/
+		calc char peek
+		calc iseoblock eq char "/"
+		if iseoblock
+			skip
+			skipchar eol
+			break
+		/
+		skipchar "\t"
+		parsestat indent
+	/
+	return
+/
+
+parsefunc:
+	declare char
+	declare first
+	declare funcname
+	declare iseoblock
+	declare isfirst
+	declare isspace
+	declare isnotfirst
+	declare isnotspace
+	declare var
+	calc funcname lexident
+	trace funcname
+	emit "\n"
+	emit funcname
+	emit ":\n"
+	set first "1"
+	forever
+		calc char peek
+		calc isspace eq char " "
+		calc isnotspace not isspace
+		if isnotspace
+			break
+		/
+		skip
+		calc var lexident
+		calc isfirst eq first "1"
+		calc isnotfirst not isfirst
+		if isnotfirst
+			emit ", "
+		/
+		set first "0"
+	/
+	calc char peek
+	calc iseoblock eq char "/"
+	if iseoblock
+		skipchar "/"
+		skipchar eol
+		emit ");"
+		emit "\n"
+		return
+	/
+	skipchar ":"
+	skipchar eol
+	parseblock "    "
+	return
+/
+
+emitheader:
+	emit "section .text\n"
+	return
+/
+
+emitfooter:
+	return
+/
+
+main:
+	declare char
+	declare iseof
+	declare iseol
+	declare isnoteol
+	emitheader
+	forever
+		calc char peek
+		calc iseof eq char eof
+		if iseof
+			break
+		/
+		forever
+			calc char peek
+			calc iseol eq char eol
+			calc isnoteol not iseol
+			if isnoteol
+				break
+			/
+			skip
+		/
+		parsefunc
+	/
+	emitfooter
+	return
+/