hackc: print syntax error message

1 files changed, 14 insertions, 8 deletions

diff --git a/projects/hackc/parser.py b/projects/hackc/parser.py
index 9a927c6..2c34d1b 100644
--- a/projects/hackc/parser.py
+++ b/projects/hackc/parser.py
@@ -35,6 +35,12 @@ class Parser:
         self._extensions = extensions
         self.tokens = []
 
+        # load source code
+        input_file = open(fp)
+        self.source = input_file.read()
+        self.lines = self.source.splitlines()
+        input_file.close()
+
     def print_tokens(self):
         print("LINE\tCOL\tTYPE\tTOKEN")
         for token in self.tokens:
@@ -42,16 +48,10 @@ class Parser:
         print(f"===== {len(self.tokens)} tokens =====")
 
     def tokenize(self):
-        # read file
-        input_file = open(self._fp)
-        source_code = input_file.read()
-        source_lines = source_code.splitlines()
-        input_file.close()
-
         # tokenize code
         self.tokens = []
         in_multicomment = False  # True when inside /* */
-        for line_no, line in enumerate(source_lines):
+        for line_no, line in enumerate(self.lines):
             pos = 0  # current position in line
             line_width = len(line)
             if in_multicomment:
@@ -94,4 +94,10 @@ class Parser:
                     exit(EXIT_CODE_INVALID_TOKEN)
 
     def parse(self):
-        syntax_tree = Class.from_tokens(self.tokens)
+        try:
+            syntax_tree = Class.from_tokens(self.tokens)
+        except JackSyntaxError as err:
+            print_err(f"{self._fp}:{err.token.line_no + 1}")
+            print_err(self.lines[err.token.line_no])
+            print_err(" " * err.token.column + "^ " + err.message)
+            exit(EXIT_CODE_SYNTAX_ERROR)