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Print the offending line of code in the traceback for SyntaxErrors 

raised by the compiler.

XXX For now, text entered into the interactive intepreter is not
printed in the traceback.

Inspired by a patch from Roman Sulzhyk

compile.c:

Add helper fetch_program_text() that opens a file and reads until it
finds the specified line number.  The code is a near duplicate of
similar code in traceback.c.

Modify com_error() to pass two arguments to SyntaxError constructor,
where the second argument contains the offending text when possible.

Modify set_error_location(), now used only by the symtable pass, to
set the text attribute on existing exceptions.

pythonrun.c:

Change parse_syntax_error() to continue of the offset attribute of a
SyntaxError is None.  In this case, it sets offset to -1.

Move code from PyErr_PrintEx() into helper function
print_error_text().  In the helper, only print the caret for a
SyntaxError if offset > 0.
This commit is contained in:
Jeremy Hylton 2001-02-28 07:07:43 +00:00
parent e860f9b983
commit 9f1b9932b8
2 changed files with 143 additions and 66 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

125
Python/compile.c
View File

@ -381,41 +381,54 @@ int is_free(int v)
return 0;
}
/* Error message including line number */
/* com_fetch_program_text will attempt to load the line of text that
the exception refers to. If it fails, it will return NULL but will
not set an exception.
static void
set_error_location(char *filename, int lineno)
XXX The functionality of this function is quite similar to the
functionality in tb_displayline() in traceback.c.
*/
static PyObject *
fetch_program_text(char *filename, int lineno)
{
PyObject *exc, *v, *tb, *tmp;
FILE *fp;
int i;
char linebuf[1000];
/* add attributes for the line number and filename for the error */
PyErr_Fetch(&exc, &v, &tb);
PyErr_NormalizeException(&exc, &v, &tb);
tmp = PyInt_FromLong(lineno);
if (tmp == NULL)
PyErr_Clear();
else {
if (PyObject_SetAttrString(v, "lineno", tmp))
PyErr_Clear();
Py_DECREF(tmp);
if (filename == NULL || lineno <= 0)
return NULL;
fp = fopen(filename, "r");
if (fp == NULL)
return NULL;
for (i = 0; i < lineno; i++) {
char *pLastChar = &linebuf[sizeof(linebuf) - 2];
do {
*pLastChar = '\0';
if (fgets(linebuf, sizeof linebuf, fp) == NULL)
break;
/* fgets read *something*; if it didn't get as
far as pLastChar, it must have found a newline
or hit the end of the file; if pLastChar is \n,
it obviously found a newline; else we haven't
yet seen a newline, so must continue */
} while (*pLastChar != '\0' && *pLastChar != '\n');
}
if (filename != NULL) {
tmp = PyString_FromString(filename);
if (tmp == NULL)
PyErr_Clear();
else {
if (PyObject_SetAttrString(v, "filename", tmp))
PyErr_Clear();
Py_DECREF(tmp);
}
fclose(fp);
if (i == lineno) {
char *p = linebuf;
while (*p == ' ' || *p == '\t' || *p == '\014')
p++;
return PyString_FromString(p);
}
PyErr_Restore(exc, v, tb);
return NULL;
}
static void
com_error(struct compiling *c, PyObject *exc, char *msg)
{
PyObject *v;
PyObject *t = NULL, *v = NULL, *w = NULL, *line = NULL;
if (c == NULL) {
/* Error occurred via symtable call to
is_constant_false */
@ -423,18 +436,33 @@ com_error(struct compiling *c, PyObject *exc, char *msg)
return;
}
c->c_errors++;
if (c->c_lineno <= 1) {
/* Unknown line number or single interactive command */
if (c->c_lineno < 1 || c->c_interactive) {
/* Unknown line number or interactive input */
PyErr_SetString(exc, msg);
return;
}
v = PyString_FromString(msg);
if (v == NULL)
return; /* MemoryError, too bad */
PyErr_SetObject(exc, v);
Py_DECREF(v);
set_error_location(c->c_filename, c->c_lineno);
line = fetch_program_text(c->c_filename, c->c_lineno);
if (line == NULL) {
Py_INCREF(Py_None);
line = Py_None;
}
t = Py_BuildValue("(ziOO)", c->c_filename, c->c_lineno,
Py_None, line);
if (t == NULL)
goto exit;
w = Py_BuildValue("(OO)", v, t);
if (w == NULL)
goto exit;
PyErr_SetObject(exc, w);
exit:
Py_XDECREF(t);
Py_XDECREF(v);
Py_XDECREF(w);
Py_XDECREF(line);
}
/* Interface to the block stack */
@ -3998,6 +4026,43 @@ get_ref_type(struct compiling *c, char *name)
return -1; /* can't get here */
}
/* Helper function for setting lineno and filename */
static void
set_error_location(char *filename, int lineno)
{
PyObject *exc, *v, *tb, *tmp;
/* add attributes for the line number and filename for the error */
PyErr_Fetch(&exc, &v, &tb);
PyErr_NormalizeException(&exc, &v, &tb);
tmp = PyInt_FromLong(lineno);
if (tmp == NULL)
PyErr_Clear();
else {
if (PyObject_SetAttrString(v, "lineno", tmp))
PyErr_Clear();
Py_DECREF(tmp);
}
if (filename != NULL) {
tmp = PyString_FromString(filename);
if (tmp == NULL)
PyErr_Clear();
else {
if (PyObject_SetAttrString(v, "filename", tmp))
PyErr_Clear();
Py_DECREF(tmp);
}
tmp = fetch_program_text(filename, lineno);
if (tmp) {
PyObject_SetAttrString(v, "text", tmp);
Py_DECREF(tmp);
}
}
PyErr_Restore(exc, v, tb);
}
static int
symtable_build(struct compiling *c, node *n)
{

84
Python/pythonrun.c
View File

@ -693,12 +693,18 @@ parse_syntax_error(PyObject *err, PyObject **message, char **filename,
if (!(v = PyObject_GetAttrString(err, "offset")))
goto finally;
hold = PyInt_AsLong(v);
Py_DECREF(v);
v = NULL;
if (hold < 0 && PyErr_Occurred())
goto finally;
*offset = (int)hold;
if (v == Py_None) {
*offset = -1;
Py_DECREF(v);
v = NULL;
} else {
hold = PyInt_AsLong(v);
Py_DECREF(v);
v = NULL;
if (hold < 0 && PyErr_Occurred())
goto finally;
*offset = (int)hold;
}
if (!(v = PyObject_GetAttrString(err, "text")))
goto finally;
@ -720,6 +726,40 @@ PyErr_Print(void)
PyErr_PrintEx(1);
}
static void
print_error_text(PyObject *f, int offset, char *text)
{
char *nl;
if (offset >= 0) {
if (offset > 0 && offset == (int)strlen(text))
offset--;
for (;;) {
nl = strchr(text, '\n');
if (nl == NULL || nl-text >= offset)
break;
offset -= (nl+1-text);
text = nl+1;
}
while (*text == ' ' || *text == '\t') {
text++;
offset--;
}
}
PyFile_WriteString(" ", f);
PyFile_WriteString(text, f);
if (*text == '\0' || text[strlen(text)-1] != '\n')
PyFile_WriteString("\n", f);
if (offset == -1)
return;
PyFile_WriteString(" ", f);
offset--;
while (offset > 0) {
PyFile_WriteString(" ", f);
offset--;
}
PyFile_WriteString("^\n", f);
}
void
PyErr_PrintEx(int set_sys_last_vars)
{
@ -795,36 +835,8 @@ PyErr_PrintEx(int set_sys_last_vars)
sprintf(buf, "%d", lineno);
PyFile_WriteString(buf, f);
PyFile_WriteString("\n", f);
if (text != NULL) {
char *nl;
if (offset > 0 &&
offset == (int)strlen(text))
offset--;
for (;;) {
nl = strchr(text, '\n');
if (nl == NULL ||
nl-text >= offset)
break;
offset -= (nl+1-text);
text = nl+1;
}
while (*text == ' ' || *text == '\t') {
text++;
offset--;
}
PyFile_WriteString(" ", f);
PyFile_WriteString(text, f);
if (*text == '\0' ||
text[strlen(text)-1] != '\n')
PyFile_WriteString("\n", f);
PyFile_WriteString(" ", f);
offset--;
while (offset > 0) {
PyFile_WriteString(" ", f);
offset--;
}
PyFile_WriteString("^\n", f);
}
if (text != NULL)
print_error_text(f, offset, text);
Py_INCREF(message);
Py_DECREF(v);
v = message;