From 1778852e86d710c5d28d46031b59e186a429dd38 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Sun, 28 Feb 2016 23:28:01 -0500
Subject: eshtrans: Support parameter lists

---
(limited to 'eshtrans')

diff --git a/eshtrans/backend/codegen.esh b/eshtrans/backend/codegen.esh
index 8fd1088..2637d51 100644
--- a/eshtrans/backend/codegen.esh
+++ b/eshtrans/backend/codegen.esh
@@ -55,6 +55,9 @@ codegen_sub()
 	local fname=
 	local static=
 	local static_fname=
+	local type=
+	local params=
+	local types=
 	local t=
 
 	print_spc=false
@@ -63,6 +66,9 @@ codegen_sub()
 	fname=''
 	static=false
 	static_fname=false
+	type=false
+	params=0
+	types=''
 
 	IFS="${RS}"
 	for t in ${array}; do
@@ -94,11 +100,22 @@ codegen_sub()
 				;;
 			T_FNAME)
 				fname="${t}"
+				params=0
+				types=''
 				;;
 			T_STATIC)
 				static=true
 				continue
 				;;
+			T_TYPE)
+				type=true
+				params=$((${params} + 1))
+				types="${types}${t#*${US}}:"
+				continue
+				;;
+			T_COMMA)
+				continue
+				;;
 		esac
 		if ${pragma}; then
 			pragma=false
@@ -128,6 +145,10 @@ codegen_sub()
 					toktext "${fname}"
 					;;
 			esac
+		elif ${type}; then
+			type=false
+			types="${types}${t#*${US}} "
+			continue
 		fi
 
 		# Function start/end tokens
@@ -139,6 +160,11 @@ codegen_sub()
 				else
 					printf ':;'
 				fi
+				if [ ${params} -gt 0 ]; then
+					printf ' __check_args %s %d %s %s;' \
+						"${fname#*${US}}" ${params} \
+						"'${types% }'" '"${@}"'
+				fi
 				;;
 			T_FN_END)
 				if ! ${pragma_nostack}; then
diff --git a/eshtrans/frontend/lexer.esh b/eshtrans/frontend/lexer.esh
index 6eb168a..275e928 100644
--- a/eshtrans/frontend/lexer.esh
+++ b/eshtrans/frontend/lexer.esh
@@ -221,6 +221,11 @@ next()
 				next_io
 				return
 				;;
+			',')
+				lgetc
+				tok=T_COMMA
+				return
+				;;
 			*)
 				next_word
 				return
@@ -438,7 +443,7 @@ scan_word()
 				lines=$((${lines} + 1))
 				word="${word}${c}"
 				;;
-			' '|"${HT}"|'&'|'|'|';'|'('|')'|'<'|'>')
+			' '|"${HT}"|'&'|'|'|';'|'('|')'|'<'|'>'|',')
 				if ! ${in_param} && ! ${quoted}; then
 					break
 				fi
@@ -949,6 +954,21 @@ accept()
 				tok="${t}"
 			fi
 			;;
+		T_TYPE)
+			# Types are recognized as literal T_WORDs.
+			if ! [ "x${tok%%${US}*}" = 'xT_WORD' ]; then
+				return 1
+			fi
+			# Validate type.
+			case "${tok#*${US}}" in
+				'bool'|'int'|'string')
+					;;
+				*)
+					return 1
+					;;
+			esac
+			tok="T_TYPE${US}${tok#T_WORD${US}}"
+			;;
 		T_NAME)
 			# Names are recognized as literal T_WORDs.
 			if ! [ "x${tok%%${US}*}" = 'xT_WORD' ]; then
diff --git a/eshtrans/frontend/parser.esh b/eshtrans/frontend/parser.esh
index 7966fb6..2607d96 100644
--- a/eshtrans/frontend/parser.esh
+++ b/eshtrans/frontend/parser.esh
@@ -421,6 +421,13 @@ simple_command()
 		return 0
 	elif accept T_FNAME; then
 		if accept T_LPAREN; then
+			if accept T_TYPE; then
+				expect T_NAME
+				while accept T_COMMA; do
+					expect T_TYPE
+					expect T_NAME
+				done
+			fi
 			expect T_RPAREN
 			if linebreak && function_body; then
 				#ptrace_pass simple_command
diff --git a/eshtrans/tokens.esh b/eshtrans/tokens.esh
index d8e57ca..a2c6b37 100644
--- a/eshtrans/tokens.esh
+++ b/eshtrans/tokens.esh
@@ -47,6 +47,7 @@ tokname()
 		T_PIPE)      n='"|"';;
 		T_LPAREN)    n='"("';;
 		T_RPAREN)    n='")"';;
+		T_COMMA)     n='","';;
 		# Reserved words
 		T_IF)     n='"if"';;
 		T_THEN)   n='"then"';;
@@ -69,6 +70,7 @@ tokname()
 		T_LOCAL)  n='"local"';;
 		T_RETURN) n='"return"';;
 		# Special symbols
+		T_TYPE)            n='parameter type';;
 		T_NAME)            n='parameter name';;
 		T_FNAME)           n='function name';;
 		T_CMDNAME)         n='command name';;
@@ -114,6 +116,7 @@ toktext()
 		T_PIPE)      n='|';;
 		T_LPAREN)    n='(';;
 		T_RPAREN)    n=')';;
+		T_COMMA)     n=',';;
 		# Reserved words
 		T_IF)     n='if';;
 		T_THEN)   n='then';;
@@ -136,6 +139,7 @@ toktext()
 		T_LOCAL)  n='local';;
 		T_RETURN) n='return';;
 		# Special symbols
+		T_TYPE)            n="${t#*${US}}";;
 		T_NAME)            n="${t#*${US}}";;
 		T_FNAME)           n="${t#*${US}}";;
 		T_CMDNAME)         n="${t#*${US}}";;
--
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