add: improvement of template parsing

[gigi.git] / src / org / cacert / gigi / output / template / TemplateParseException.java

diff --git a/src/org/cacert/gigi/output/template/TemplateParseException.java b/src/org/cacert/gigi/output/template/TemplateParseException.java
new file mode 100644 (file)
index 0000000..e52f114
--- /dev/null
+++ b/src/org/cacert/gigi/output/template/TemplateParseException.java
@@ -0,0 +1,89 @@
+package org.cacert.gigi.output.template;
+
+import java.io.IOException;
+import java.util.Set;
+import java.util.TreeSet;
+
+/**
+ * A exception that is thrown when a template contains syntactic errors. It
+ * allows the combining of several error messages to catch more than one error
+ * in a template.
+ */
+public class TemplateParseException extends IOException {
+
+    private static final long serialVersionUID = 1L;
+
+    private Object templateSource;
+
+    private Set<ErrorMessage> errors = new TreeSet<>();
+
+    public TemplateParseException(Object templateSource) {
+        this.templateSource = templateSource;
+    }
+
+    public void addError(ErrorMessage error) {
+        errors.add(error);
+    }
+
+    public void addError(int line, int column, String message, String erroneousLine) {
+        addError(new ErrorMessage(line, column, message, erroneousLine));
+    }
+
+    public void append(TemplateParseException other) {
+        errors.addAll(other.errors);
+    }
+
+    @Override
+    public String toString() {
+        StringBuilder strb = new StringBuilder("Error in template \"");
+        strb.append(templateSource);
+        strb.append("\":");
+        for (ErrorMessage errorMessage : errors) {
+            strb.append("\n\t");
+            strb.append(errorMessage.toString());
+        }
+        return strb.toString();
+    }
+
+    @Override
+    public String getMessage() {
+        return toString();
+    }
+
+    public boolean isEmpty() {
+        return errors.isEmpty();
+    }
+
+    public static class ErrorMessage implements Comparable<ErrorMessage> {
+
+        private final int line;
+
+        private final int column;
+
+        private final String message;
+
+        private final String erroneousLine;
+
+        public ErrorMessage(int line, int column, String message, String erroneousLine) {
+            this.line = line;
+            this.column = column;
+            this.message = message;
+            this.erroneousLine = erroneousLine;
+        }
+
+        @Override
+        public String toString() {
+            return String.format("Around %d:%d (after …%s…) %s", line, column, erroneousLine, message);
+        }
+
+        @Override
+        public int compareTo(ErrorMessage o) {
+            int l = Integer.compare(line, o.line);
+            if (l != 0) {
+                return l;
+            }
+            return Integer.compare(column, o.column);
+        }
+    }
+
+}