# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1483985504 -3600
# Node ID 0982751b90e31b1cc7956f881d42b010853526db
# Parent  40e31f6740089744c6bf3a5b5a344843b345e403
Handle syntax errors produced by pyparser.

diff -r 40e31f674008 -r 0982751b90e3 lplc
--- a/lplc	Mon Jan 09 19:11:31 2017 +0100
+++ b/lplc	Mon Jan 09 19:11:44 2017 +0100
@@ -3,6 +3,7 @@
 from errors import *
 from os import rename
 from os.path import abspath, exists, join, split
+from pyparser import error
 from subprocess import Popen, PIPE
 from time import time
 import importer, deducer, optimiser, generator, translator
@@ -26,6 +27,12 @@
     for module_name, name in missing:
         print >>sys.stderr, "Module %s references an unknown object: %s" % (module_name, name)
 
+def show_syntax_error(exc):
+    print >>sys.stderr, "Syntax error at column %d on line %d in file %s:" % (exc.offset, exc.lineno, exc.filename)
+    print >>sys.stderr
+    print >>sys.stderr, exc.text.rstrip()
+    print >>sys.stderr, " " * exc.offset + "^"
+
 def stopwatch(activity, now):
     print >>sys.stderr, "%s took %.2f seconds" % (activity, time() - now)
     return time()
@@ -151,6 +158,12 @@
 
     # Report any errors.
 
+    except error.SyntaxError, exc:
+        show_syntax_error(exc)
+        if "-tb" in args:
+            raise
+        sys.exit(1)
+
     except ProcessingError, exc:
         print exc
         if "-tb" in args: