From 6d437b04c4517783e682e2309cc9e0056883c488 Mon Sep 17 00:00:00 2001
From: Syndamia <kamen@syndamia.com>
Date: Sun, 25 Feb 2024 15:48:19 +0200
Subject: (awk-edits/MEL) Added error messages

---
 awk-edits/MEL-parser.awk | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/awk-edits/MEL-parser.awk b/awk-edits/MEL-parser.awk
index 6cf0514..af1e26d 100644
--- a/awk-edits/MEL-parser.awk
+++ b/awk-edits/MEL-parser.awk
@@ -42,6 +42,11 @@ function usesMEL() {
 	MELLINE      = "l"
 }
 
+function printErr(message) {
+	print "ERROR by MEL-parser.awk: " message " | Found in " FILENAME " at line " FNR " & column " RSTART + length(newLine) - 5 ":\n" $0 > "/dev/stderr"
+	print > "/dev/stderr"
+}
+
 /<code>/ {
 	melInsideCode = 1
 }
@@ -62,6 +67,10 @@ melInsideCode == 0 && /^[ \t]*(<p>|<dt>)?&#38;[{[()\]}:.]/ {
 		# Inside closing tag
 		if (RLENGTH == 1) {
 			replaceWith = MEL[topStack("mel"), MELCLOSE]
+
+			if (replaceWith == "")
+				printErr("Missing closing tag for \"" topStack("mel") "\"")
+
 			popStack("mel")
 		}
 		# Inside insert
@@ -69,6 +78,9 @@ melInsideCode == 0 && /^[ \t]*(<p>|<dt>)?&#38;[{[()\]}:.]/ {
 			name = substr(lineCopy, RSTART + 1, RLENGTH - 1)
 
 			replaceWith = MEL[name, MELINSERT]
+
+			if (replaceWith == "")
+				printErr("Unknown insertion tag \"" name "\"")
 		}
 		# Inside one line
 		else if (substr(lineCopy, RSTART, 2) == "::") {
@@ -76,6 +88,14 @@ melInsideCode == 0 && /^[ \t]*(<p>|<dt>)?&#38;[{[()\]}:.]/ {
 
 			replaceWith = MEL[name, MELLINEOPEN]
 			append = append MEL[name, MELLINECLOSE]
+
+
+			if (replaceWith == "" && append == "")
+				printErr("Unknown single line tag \"" name "\"")
+			else if (replaceWith == "")
+				printErr("Missing beginning for line tag \"" name "\"")
+			else
+				printErr("Missing ending for line tag \"" name "\"")
 		}
 		# Inside paragraph
 		else if (substr(lineCopy, RSTART, 1) == ":") {
@@ -85,6 +105,9 @@ melInsideCode == 0 && /^[ \t]*(<p>|<dt>)?&#38;[{[()\]}:.]/ {
 			RSTART  -= 1
 			RLENGTH += 1
 			paragraphed = 1
+
+			if (replaceWith == "")
+				printErr("Unknown paragraph tag \"" name "\"")
 		}
 		# Inside opening tag
 		else {
@@ -92,6 +115,9 @@ melInsideCode == 0 && /^[ \t]*(<p>|<dt>)?&#38;[{[()\]}:.]/ {
 
 			replaceWith = MEL[name, MELOPEN]
 			pushStack("mel", name)
+
+			if (replaceWith == "")
+				printErr("Unknown opening tag \"" name "\"")
 		}
 		newLine = newLine substr(lineCopy, 0, RSTART - 6) replaceWith
 		lineCopy = substr(lineCopy, RSTART + RLENGTH)
-- 
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