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annotate Python/future.c @ 16799:08d937107fe6 legacy-trunk

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Improved __future__ parser; still more to do Makefile.pre.in: add target future.o Include/compile.h: define PyFutureFeaters and PyNode_Future() add c_future slot to struct compiling Include/symtable.h: add st_future slot to struct symtable Python/future.c: implementation of PyNode_Future() Python/compile.c: use PyNode_Future() for nested_scopes support Python/symtable.c: include compile.h to pick up PyFutureFeatures decl
author Jeremy Hylton <jeremy@alum.mit.edu>
date Tue, 27 Feb 2001 19:07:02 +0000
parents
children acbe74f3a786
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
16799
08d937107fe6 Improved __future__ parser; still more to do
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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
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10 static int
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11 future_check_features(PyFutureFeatures *ff, node *n)
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12 {
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13 int i;
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14 char *feature;
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15
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16 REQ(n, import_stmt); /* must by from __future__ import ... */
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17
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18 for (i = 3; i < NCH(n); ++i) {
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19 feature = STR(CHILD(CHILD(n, i), 0));
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20 if (strcmp(feature, FUTURE_NESTED_SCOPES) == 0) {
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21 ff->ff_nested_scopes = 1;
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22 } else {
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23 PyErr_Format(PyExc_SyntaxError,
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24 UNDEFINED_FUTURE_FEATURE, feature);
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25 return -1;
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26 }
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27 }
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28 return 0;
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29 }
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30
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31 /* Relevant portions of the grammar:
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32
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33 single_input: NEWLINE | simple_stmt | compound_stmt NEWLINE
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34 file_input: (NEWLINE | stmt)* ENDMARKER
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35 stmt: simple_stmt | compound_stmt
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36 simple_stmt: small_stmt (';' small_stmt)* [';'] NEWLINE
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37 small_stmt: expr_stmt | print_stmt | del_stmt | pass_stmt | flow_stmt | import_stmt | global_stmt | exec_stmt | assert_stmt
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38 import_stmt: 'import' dotted_as_name (',' dotted_as_name)* | 'from' dotted_name 'import' ('*' | import_as_name (',' import_as_name)*)
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39 import_as_name: NAME [NAME NAME]
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40 dotted_as_name: dotted_name [NAME NAME]
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41 dotted_name: NAME ('.' NAME)*
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42 */
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43
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44 /* future_parse() return values:
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45 -1 indicates an error occurred, e.g. unknown feature name
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46 0 indicates no feature was found
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47 1 indicates a feature was found
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48 */
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49
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50 static int
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51 future_parse(PyFutureFeatures *ff, node *n)
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52 {
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53 int i, r, found;
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54 loop:
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55
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56 /* fprintf(stderr, "future_parse(%d, %d, %s)\n",
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57 TYPE(n), NCH(n), (n == NULL) ? "NULL" : STR(n));
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58 */
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59 switch (TYPE(n)) {
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60
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61 case file_input:
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62 for (i = 0; i < NCH(n); i++) {
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63 node *ch = CHILD(n, i);
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64 if (TYPE(ch) == stmt) {
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65 n = ch;
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66 goto loop;
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67 }
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68 }
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69 return 0;
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70
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71 case simple_stmt:
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72 if (NCH(n) == 1) {
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73 REQ(CHILD(n, 0), small_stmt);
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74 n = CHILD(n, 0);
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75 goto loop;
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76 }
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77 found = 0;
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78 for (i = 0; i < NCH(n); ++i)
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79 if (TYPE(CHILD(n, i)) == small_stmt) {
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80 r = future_parse(ff, CHILD(n, i));
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81 if (r < 1) {
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82 ff->ff_last_lineno = n->n_lineno;
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83 ff->ff_n_simple_stmt = i;
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84 return r;
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85 } else
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86 found++;
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87 }
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88 if (found)
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89 return 1;
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90 else
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91 return 0;
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92
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93 case stmt:
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94 if (TYPE(CHILD(n, 0)) == simple_stmt) {
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95 n = CHILD(n, 0);
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96 goto loop;
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97 } else {
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98 REQ(CHILD(n, 0), compound_stmt);
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99 ff->ff_last_lineno = n->n_lineno;
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100 return 0;
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101 }
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102
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103 case small_stmt:
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104 n = CHILD(n, 0);
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105 goto loop;
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106
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107 case import_stmt: {
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108 node *name;
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109
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110 if (STR(CHILD(n, 0))[0] != 'f') { /* from */
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111 ff->ff_last_lineno = n->n_lineno;
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112 return 0;
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113 }
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114 name = CHILD(n, 1);
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115 if (strcmp(STR(CHILD(name, 0)), "__future__") != 0)
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116 return 0;
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117 if (future_check_features(ff, n) < 0)
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118 return -1;
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119 return 1;
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120 }
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121
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122 default:
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123 ff->ff_last_lineno = n->n_lineno;
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124 return 0;
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125 }
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126 }
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127
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128 PyFutureFeatures *
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129 PyNode_Future(node *n, char *filename)
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130 {
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131 PyFutureFeatures *ff;
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132
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133 ff = (PyFutureFeatures *)PyMem_Malloc(sizeof(PyFutureFeatures));
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134 if (ff == NULL)
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135 return NULL;
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136 ff->ff_last_lineno = 0;
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137 ff->ff_n_simple_stmt = -1;
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138 ff->ff_nested_scopes = 0;
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139
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140 if (future_parse(ff, n) < 0) {
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141 PyMem_Free((void *)ff);
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142 return NULL;
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143 }
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144 return ff;
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145 }
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146