1 files changed, 144 insertions, 0 deletions
diff --git a/unix/boot/spp/rpp/rpprat/parse.r b/unix/boot/spp/rpp/rpprat/parse.r
new file mode 100644
index 00000000..676ee759
--- /dev/null
+++ b/unix/boot/spp/rpp/rpprat/parse.r
@@ -0,0 +1,144 @@
+include  defs
+
+# PARSE - parse Ratfor source program
+
+subroutine parse
+
+include COMMON_BLOCKS
+character lexstr(MAXTOK)
+integer lab, labval(MAXSTACK), lextyp(MAXSTACK), sp, token, i, t
+integer lex
+logical	push_stack
+
+	sp = 1
+	lextyp(1) = EOF
+
+	for (token = lex(lexstr);  token != EOF;  token = lex(lexstr)) {
+	    push_stack = .false.
+
+	    switch (token) {
+	    case LEXIF:
+		call ifcode (lab)
+		push_stack = .true.
+	    case LEXIFERR:
+		call iferrc (lab, 1)
+		push_stack = .true.
+	    case LEXIFNOERR:
+		call iferrc (lab, 0)
+		push_stack = .true.
+	    case LEXDO:
+		call docode (lab)
+		push_stack = .true.
+	    case LEXWHILE:
+		call whilec (lab)
+		push_stack = .true.
+	    case LEXFOR:
+		call forcod (lab)
+		push_stack = .true.
+	    case LEXREPEAT:
+		call repcod (lab)
+		push_stack = .true.
+	    case LEXSWITCH:
+		call swcode (lab)
+		push_stack = .true.
+	    case LEXCASE, LEXDEFAULT:
+		for (i=sp;  i > 0;  i=i-1)	# find for most recent switch
+		    if (lextyp(i) == LEXSWITCH)
+		       break
+		if (i == 0)
+		    call synerr ("illegal case or default.")
+		else
+		    call cascod (labval (i), token)
+	    case LEXDIGITS:
+		call labelc (lexstr)
+		push_stack = .true.
+	    case LEXELSE:
+		t = lextyp(sp)
+		if (t == LEXIF | t == LEXIFERR | t == LEXIFNOERR)
+		    call elseif (labval(sp))
+		else
+		    call synerr ("Illegal else.")
+
+		t = lex (lexstr)			# check for "else if"
+		call pbstr (lexstr)
+		if (t == LEXIF | t == LEXIFERR | t == LEXIFNOERR) {
+		    call indent (-1)			# cancel out indent +1
+		    token = LEXIFELSE			# prevent -indent at end
+		}
+		push_stack = .true.
+	    case LEXTHEN:
+		if (lextyp(sp) == LEXIFERR | lextyp(sp) == LEXIFNOERR) {
+		    call thenco (lextyp(sp), labval(sp))
+		    lab = labval(sp)
+		    token = lextyp(sp)
+		    sp = sp - 1			# cancel out subsequent push
+		} else
+		    call synerr ("Illegal 'then' clause in iferr statement.")
+		push_stack = .true.
+	    case LEXLITERAL:
+		call litral
+	    case LEXERRCHK:
+		call errchk
+	    case LEXBEGIN:
+		call beginc
+	    case LEXEND:
+		call endcod (lexstr)
+		if (sp != 1) {
+		    call synerr ("Missing right brace or 'begin'.")
+		    sp = 1
+		}
+	    default:
+		if (token == LBRACE)
+		    push_stack = .true.
+		else if (token == LEXDECL)
+		    call declco (lexstr)
+	    }
+
+	    if (push_stack) {
+		if (body == NO) {
+		    call synerr ("Missing 'begin' keyword.")
+		    call beginc
+		}
+		sp = sp + 1				# beginning of statement
+		if (sp > MAXSTACK)
+		    call baderr ("Stack overflow in parser.")
+		lextyp(sp) = token			# stack type and value
+		labval(sp) = lab
+
+	    } else if (token != LEXCASE & token != LEXDEFAULT) {
+		if (token == RBRACE)
+		    token = LEXRBRACE
+
+		switch (token) {
+		case LEXOTHER:
+		    call otherc (lexstr)
+		case LEXBREAK, LEXNEXT:
+		    call brknxt (sp, lextyp, labval, token)
+		case LEXRETURN:
+		    call retcod
+		case LEXGOTO:
+		    call gocode
+		case LEXSTRING:
+		    if (body == NO)
+			call strdcl
+		    else
+			call otherc (lexstr)
+		case LEXRBRACE:
+		    if (lextyp(sp) == LBRACE)
+			sp = sp - 1
+		    else if (lextyp(sp) == LEXSWITCH) {
+			call swend (labval(sp))
+			sp = sp - 1
+		    } else
+		       call synerr ("Illegal right brace.")
+		}
+
+		token = lex (lexstr)	   		# peek at next token
+		call pbstr (lexstr)
+		call unstak (sp, lextyp, labval, token)
+	    }
+	}
+
+	if (sp != 1)
+	    call synerr ("unexpected EOF.")
+end