Mercurial > cpython-lru_cache-weakref

annotate Python/future.c @ 16845:09dcf5ebcd80 legacy-trunk

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Now that Jeremy is asking about this code, it looks really bogus to me, so let's rip it out. The constructor for SyntaxError does the right thing, so we do not need to do it again.
author Fred Drake <fdrake@acm.org>
date Wed, 28 Feb 2001 20:58:04 +0000
parents 09f6c1372056
children 7a36f6201c94
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #include "Python.h"
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2 #include "node.h"
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3 #include "token.h"
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4 #include "graminit.h"
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5 #include "compile.h"
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6 #include "symtable.h"
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7
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8 #define UNDEFINED_FUTURE_FEATURE "future feature %.100s is not defined"
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9 #define FUTURE_IMPORT_STAR "future statement does not support import *"
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10
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11 #define FUTURE_POSSIBLE(FF) ((FF)->ff_last_lineno == -1)
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12
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13 static int
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14 future_check_features(PyFutureFeatures *ff, node *n, char *filename)
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15 {
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16 int i;
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17 char *feature;
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18 node *ch;
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19
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20 REQ(n, import_stmt); /* must by from __future__ import ... */
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21
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22 for (i = 3; i < NCH(n); ++i) {
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23 ch = CHILD(n, i);
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24 if (TYPE(ch) == STAR) {
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25 PyErr_SetString(PyExc_SyntaxError,
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26 FUTURE_IMPORT_STAR);
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27 PyErr_SyntaxLocation(filename, ch->n_lineno);
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28 return -1;
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29 }
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30 REQ(ch, import_as_name);
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31 feature = STR(CHILD(ch, 0));
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32 if (strcmp(feature, FUTURE_NESTED_SCOPES) == 0) {
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33 ff->ff_nested_scopes = 1;
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34 } else if (strcmp(feature, "braces") == 0) {
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35 PyErr_SetString(PyExc_SyntaxError,
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36 "not a chance");
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37 PyErr_SyntaxLocation(filename, CHILD(ch, 0)->n_lineno);
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38 return -1;
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39 } else {
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40 PyErr_Format(PyExc_SyntaxError,
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41 UNDEFINED_FUTURE_FEATURE, feature);
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42 PyErr_SyntaxLocation(filename, CHILD(ch, 0)->n_lineno);
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43 return -1;
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44 }
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45 }
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46 return 0;
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47 }
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48
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49 static void
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50 future_error(node *n, char *filename)
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51 {
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52 PyErr_SetString(PyExc_SyntaxError,
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53 "from __future__ imports must occur at the "
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54 "beginning of the file");
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55 PyErr_SyntaxLocation(filename, n->n_lineno);
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56 /* XXX set filename and lineno */
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57 }
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58
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59 /* Relevant portions of the grammar:
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60
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61 single_input: NEWLINE | simple_stmt | compound_stmt NEWLINE
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62 file_input: (NEWLINE | stmt)* ENDMARKER
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63 stmt: simple_stmt | compound_stmt
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64 simple_stmt: small_stmt (';' small_stmt)* [';'] NEWLINE
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65 small_stmt: expr_stmt | print_stmt | del_stmt | pass_stmt | flow_stmt
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66 | import_stmt | global_stmt | exec_stmt | assert_stmt
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67 import_stmt: 'import' dotted_as_name (',' dotted_as_name)*
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68 | 'from' dotted_name 'import' ('*' | import_as_name (',' import_as_name)*)
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69 import_as_name: NAME [NAME NAME]
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70 dotted_as_name: dotted_name [NAME NAME]
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71 dotted_name: NAME ('.' NAME)*
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72 */
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73
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74 /* future_parse() return values:
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75 -1 indicates an error occurred, e.g. unknown feature name
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76 0 indicates no feature was found
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77 1 indicates a feature was found
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78 */
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79
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80 static int
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81 future_parse(PyFutureFeatures *ff, node *n, char *filename)
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82 {
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83 int i, r;
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84 loop:
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85
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86 switch (TYPE(n)) {
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87
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88 case single_input:
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89 if (TYPE(CHILD(n, 0)) == simple_stmt) {
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90 n = CHILD(n, 0);
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91 goto loop;
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92 }
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93 return 0;
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94
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95 case file_input:
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96 for (i = 0; i < NCH(n); i++) {
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97 node *ch = CHILD(n, i);
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98 if (TYPE(ch) == stmt) {
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99 r = future_parse(ff, ch, filename);
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100 if (!FUTURE_POSSIBLE(ff))
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101 return r;
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102 }
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103 }
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104 return 0;
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105
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106 case simple_stmt:
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107 if (NCH(n) == 2) {
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108 REQ(CHILD(n, 0), small_stmt);
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109 n = CHILD(n, 0);
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110 goto loop;
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111 } else {
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112 /* Deal with the special case of a series of
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113 small statements on a single line. If a
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114 future statement follows some other
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115 statement, the SyntaxError is raised here.
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116 In all other cases, the symtable pass
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117 raises the exception.
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118 */
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119 int found = 0, end_of_future = 0;
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120
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121 for (i = 0; i < NCH(n); i += 2) {
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122 if (TYPE(CHILD(n, i)) == small_stmt) {
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123 r = future_parse(ff, CHILD(n, i),
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124 filename);
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125 if (r < 1)
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126 end_of_future = 1;
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127 else {
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128 found = 1;
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129 if (end_of_future) {
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130 future_error(n,
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
131 filename);
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
132 return -1;
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
133 }
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
134 }
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
135 }
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
136 }
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
137
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
138 /* If we found one and only one, then the
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
139 current lineno is legal.
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
140 */
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
141 if (found)
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
142 ff->ff_last_lineno = n->n_lineno + 1;
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
143 else
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
144 ff->ff_last_lineno = n->n_lineno;
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
145
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
146 if (end_of_future && found)
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
147 return 1;
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parents: 16799
diff changeset
148 else
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parents: 16799
diff changeset
149 return 0;
16799
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
150 }
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
151
08d937107fe6 Improved __future__ parser; still more to do
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parents:
diff changeset
152 case stmt:
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parents:
diff changeset
153 if (TYPE(CHILD(n, 0)) == simple_stmt) {
08d937107fe6 Improved __future__ parser; still more to do
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parents:
diff changeset
154 n = CHILD(n, 0);
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
155 goto loop;
16823
acbe74f3a786 Presumed correct compiler pass for future statements
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parents: 16799
diff changeset
156 } else if (TYPE(CHILD(n, 0)) == expr_stmt) {
acbe74f3a786 Presumed correct compiler pass for future statements
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parents: 16799
diff changeset
157 n = CHILD(n, 0);
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parents: 16799
diff changeset
158 goto loop;
16799
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
159 } else {
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
160 REQ(CHILD(n, 0), compound_stmt);
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
161 ff->ff_last_lineno = n->n_lineno;
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
162 return 0;
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
163 }
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
164
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
165 case small_stmt:
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parents:
diff changeset
166 n = CHILD(n, 0);
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Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
167 goto loop;
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
168
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
169 case import_stmt: {
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
170 node *name;
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Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
171
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
172 if (STR(CHILD(n, 0))[0] != 'f') { /* from */
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
173 ff->ff_last_lineno = n->n_lineno;
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
174 return 0;
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
175 }
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
176 name = CHILD(n, 1);
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
177 if (strcmp(STR(CHILD(name, 0)), "__future__") != 0)
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
178 return 0;
16838
09f6c1372056 Improve SyntaxErrors for bad future statements. Set file and location
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16824
diff changeset
179 if (future_check_features(ff, n, filename) < 0)
16799
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
180 return -1;
16824
d4a315e4094c Need to support single_input explicitly so from __future__ imports
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16823
diff changeset
181 ff->ff_last_lineno = n->n_lineno + 1;
16799
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
182 return 1;
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
183 }
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
184
16823
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
185 /* The cases below -- all of them! -- are necessary to find
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
186 and skip doc strings. */
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
187 case expr_stmt:
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
188 case testlist:
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
189 case test:
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
190 case and_test:
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
191 case not_test:
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
192 case comparison:
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
193 case expr:
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
194 case xor_expr:
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
195 case and_expr:
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
196 case shift_expr:
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
197 case arith_expr:
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
198 case term:
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
199 case factor:
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
200 case power:
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
201 if (NCH(n) == 1) {
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
202 n = CHILD(n, 0);
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
203 goto loop;
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
204 }
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
205 break;
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
206
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
207 case atom:
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
208 if (TYPE(CHILD(n, 0)) == STRING
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
209 && ff->ff_found_docstring == 0) {
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
210 ff->ff_found_docstring = 1;
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
211 return 0;
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
212 }
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
213 ff->ff_last_lineno = n->n_lineno;
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
214 return 0;
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
215
16799
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
216 default:
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
217 ff->ff_last_lineno = n->n_lineno;
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
218 return 0;
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
219 }
16823
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
220 return 0;
16799
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
221 }
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
222
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
223 PyFutureFeatures *
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
224 PyNode_Future(node *n, char *filename)
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
225 {
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
226 PyFutureFeatures *ff;
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
227
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
228 ff = (PyFutureFeatures *)PyMem_Malloc(sizeof(PyFutureFeatures));
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
229 if (ff == NULL)
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
230 return NULL;
16823
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
231 ff->ff_found_docstring = 0;
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
232 ff->ff_last_lineno = -1;
16799
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
233 ff->ff_nested_scopes = 0;
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
234
16823
acbe74f3a786 Presumed correct compiler pass for future statements
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16799
diff changeset
235 if (future_parse(ff, n, filename) < 0) {
16799
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
236 PyMem_Free((void *)ff);
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
237 return NULL;
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
238 }
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
239 return ff;
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
240 }
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
241