aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/tools/python/src/Parser/parsetok.c
blob: a5e922243c56bc79cf39cb9acb2dd97e7aee5635 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
/* Parser-tokenizer link implementation */

#include "pgenheaders.h"
#include "tokenizer.h"
#include "node.h"
#include "grammar.h"
#include "parser.h"
#include "parsetok.h"
#include "errcode.h"
#include "graminit.h"

int Py_TabcheckFlag;


/* Forward */
static node *parsetok(struct tok_state *, grammar *, int, perrdetail *, int *);
static void initerr(perrdetail *err_ret, const char* filename);

/* Parse input coming from a string.  Return error code, print some errors. */
node *
PyParser_ParseString(const char *s, grammar *g, int start, perrdetail *err_ret)
{
    return PyParser_ParseStringFlagsFilename(s, NULL, g, start, err_ret, 0);
}

node *
PyParser_ParseStringFlags(const char *s, grammar *g, int start,
                          perrdetail *err_ret, int flags)
{
    return PyParser_ParseStringFlagsFilename(s, NULL,
                                             g, start, err_ret, flags);
}

node *
PyParser_ParseStringFlagsFilename(const char *s, const char *filename,
                          grammar *g, int start,
                          perrdetail *err_ret, int flags)
{
    int iflags = flags;
    return PyParser_ParseStringFlagsFilenameEx(s, filename, g, start,
                                               err_ret, &iflags);
}

node *
PyParser_ParseStringFlagsFilenameEx(const char *s, const char *filename,
                          grammar *g, int start,
                          perrdetail *err_ret, int *flags)
{
    struct tok_state *tok;

    initerr(err_ret, filename);

    if ((tok = PyTokenizer_FromString(s, start == file_input)) == NULL) {
        err_ret->error = PyErr_Occurred() ? E_DECODE : E_NOMEM;
        return NULL;
    }

    tok->filename = filename ? filename : "<string>";
    if (Py_TabcheckFlag || Py_VerboseFlag) {
        tok->altwarning = (tok->filename != NULL);
        if (Py_TabcheckFlag >= 2)
            tok->alterror++;
    }

    return parsetok(tok, g, start, err_ret, flags);
}

/* Parse input coming from a file.  Return error code, print some errors. */

node *
PyParser_ParseFile(FILE *fp, const char *filename, grammar *g, int start,
                   char *ps1, char *ps2, perrdetail *err_ret)
{
    return PyParser_ParseFileFlags(fp, filename, g, start, ps1, ps2,
                                   err_ret, 0);
}

node *
PyParser_ParseFileFlags(FILE *fp, const char *filename, grammar *g, int start,
                        char *ps1, char *ps2, perrdetail *err_ret, int flags)
{
    int iflags = flags;
    return PyParser_ParseFileFlagsEx(fp, filename, g, start, ps1, ps2, err_ret, &iflags);
}

node *
PyParser_ParseFileFlagsEx(FILE *fp, const char *filename, grammar *g, int start,
                          char *ps1, char *ps2, perrdetail *err_ret, int *flags)
{
    struct tok_state *tok;

    initerr(err_ret, filename);

    if ((tok = PyTokenizer_FromFile(fp, ps1, ps2)) == NULL) {
        err_ret->error = E_NOMEM;
        return NULL;
    }
    tok->filename = filename;
    if (Py_TabcheckFlag || Py_VerboseFlag) {
        tok->altwarning = (filename != NULL);
        if (Py_TabcheckFlag >= 2)
            tok->alterror++;
    }

    return parsetok(tok, g, start, err_ret, flags);
}

#if 0
static char with_msg[] =
"%s:%d: Warning: 'with' will become a reserved keyword in Python 2.6\n";

static char as_msg[] =
"%s:%d: Warning: 'as' will become a reserved keyword in Python 2.6\n";

static void
warn(const char *msg, const char *filename, int lineno)
{
    if (filename == NULL)
        filename = "<string>";
    PySys_WriteStderr(msg, filename, lineno);
}
#endif

/* Parse input coming from the given tokenizer structure.
   Return error code. */

static node *
parsetok(struct tok_state *tok, grammar *g, int start, perrdetail *err_ret,
         int *flags)
{
    parser_state *ps;
    node *n;
    int started = 0;

    if ((ps = PyParser_New(g, start)) == NULL) {
        fprintf(stderr, "no mem for new parser\n");
        err_ret->error = E_NOMEM;
        PyTokenizer_Free(tok);
        return NULL;
    }
#ifdef PY_PARSER_REQUIRES_FUTURE_KEYWORD
    if (*flags & PyPARSE_PRINT_IS_FUNCTION) {
        ps->p_flags |= CO_FUTURE_PRINT_FUNCTION;
    }
    if (*flags & PyPARSE_UNICODE_LITERALS) {
        ps->p_flags |= CO_FUTURE_UNICODE_LITERALS;
    }

#endif

    for (;;) {
        char *a, *b;
        int type;
        size_t len;
        char *str;
        int col_offset;

        type = PyTokenizer_Get(tok, &a, &b);
        if (type == ERRORTOKEN) {
            err_ret->error = tok->done;
            break;
        }
        if (type == ENDMARKER && started) {
            type = NEWLINE; /* Add an extra newline */
            started = 0;
            /* Add the right number of dedent tokens,
               except if a certain flag is given --
               codeop.py uses this. */
            if (tok->indent &&
                !(*flags & PyPARSE_DONT_IMPLY_DEDENT))
            {
                tok->pendin = -tok->indent;
                tok->indent = 0;
            }
        }
        else
            started = 1;
        len = (a != NULL && b != NULL) ? b - a : 0;
        str = (char *) PyObject_MALLOC(len + 1);
        if (str == NULL) {
            fprintf(stderr, "no mem for next token\n");
            err_ret->error = E_NOMEM;
            break;
        }
        if (len > 0)
            strncpy(str, a, len);
        str[len] = '\0';

#ifdef PY_PARSER_REQUIRES_FUTURE_KEYWORD
#endif
        if (a != NULL && a >= tok->line_start) {
            col_offset = a - tok->line_start;
        }
        else {
            col_offset = -1;
        }

        if ((err_ret->error =
             PyParser_AddToken(ps, (int)type, str, tok->lineno, col_offset,
                               &(err_ret->expected))) != E_OK) {
            if (err_ret->error != E_DONE) {
                PyObject_FREE(str);
                err_ret->token = type;
            }
            break;
        }
    }

    if (err_ret->error == E_DONE) {
        n = ps->p_tree;
        ps->p_tree = NULL;
    }
    else
        n = NULL;

#ifdef PY_PARSER_REQUIRES_FUTURE_KEYWORD
    *flags = ps->p_flags;
#endif
    PyParser_Delete(ps);

    if (n == NULL) {
        if (tok->lineno <= 1 && tok->done == E_EOF)
            err_ret->error = E_EOF;
        err_ret->lineno = tok->lineno;
        if (tok->buf != NULL) {
            char *text = NULL;
            size_t len;
            assert(tok->cur - tok->buf < INT_MAX);
            err_ret->offset = (int)(tok->cur - tok->buf);
            len = tok->inp - tok->buf;
#ifdef Py_USING_UNICODE
            text = PyTokenizer_RestoreEncoding(tok, len, &err_ret->offset);

#endif
            if (text == NULL) {
                text = (char *) PyObject_MALLOC(len + 1);
                if (text != NULL) {
                    if (len > 0)
                        strncpy(text, tok->buf, len);
                    text[len] = '\0';
                }
            }
            err_ret->text = text;
        }
    } else if (tok->encoding != NULL) {
        /* 'nodes->n_str' uses PyObject_*, while 'tok->encoding' was
         * allocated using PyMem_
         */
        node* r = PyNode_New(encoding_decl);
        if (r)
            r->n_str = PyObject_MALLOC(strlen(tok->encoding)+1);
        if (!r || !r->n_str) {
            err_ret->error = E_NOMEM;
            if (r)
                PyObject_FREE(r);
            n = NULL;
            goto done;
        }
        strcpy(r->n_str, tok->encoding);
        PyMem_FREE(tok->encoding);
        tok->encoding = NULL;
        r->n_nchildren = 1;
        r->n_child = n;
        n = r;
    }

done:
    PyTokenizer_Free(tok);

    return n;
}

static void
initerr(perrdetail *err_ret, const char *filename)
{
    err_ret->error = E_OK;
    err_ret->filename = filename;
    err_ret->lineno = 0;
    err_ret->offset = 0;
    err_ret->text = NULL;
    err_ret->token = -1;
    err_ret->expected = -1;
}