Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/mujs/jsintern.c @ 46:7ee69f120f19 default tip

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>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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1 #include "jsi.h"
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2
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3 /* Dynamically grown string buffer */
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4
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5 void js_putc(js_State *J, js_Buffer **sbp, int c)
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6 {
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7 js_Buffer *sb = *sbp;
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8 if (!sb) {
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9 sb = js_malloc(J, sizeof *sb);
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10 sb->n = 0;
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11 sb->m = sizeof sb->s;
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12 *sbp = sb;
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13 } else if (sb->n == sb->m) {
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14 sb = js_realloc(J, sb, (sb->m *= 2) + soffsetof(js_Buffer, s));
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15 *sbp = sb;
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16 }
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17 sb->s[sb->n++] = c;
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18 }
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20 void js_puts(js_State *J, js_Buffer **sb, const char *s)
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21 {
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22 while (*s)
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23 js_putc(J, sb, *s++);
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24 }
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26 void js_putm(js_State *J, js_Buffer **sb, const char *s, const char *e)
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27 {
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28 while (s < e)
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29 js_putc(J, sb, *s++);
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30 }
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32 /* Use an AA-tree to quickly look up interned strings. */
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34 struct js_StringNode
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35 {
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36 js_StringNode *left, *right;
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37 int level;
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38 char string[1];
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39 };
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41 static js_StringNode jsS_sentinel = { &jsS_sentinel, &jsS_sentinel, 0, ""};
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43 static js_StringNode *jsS_newstringnode(js_State *J, const char *string, const char **result)
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44 {
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45 size_t n = strlen(string);
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46 if (n > JS_STRLIMIT)
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47 js_rangeerror(J, "invalid string length");
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48 js_StringNode *node = js_malloc(J, soffsetof(js_StringNode, string) + n + 1);
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49 node->left = node->right = &jsS_sentinel;
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50 node->level = 1;
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51 memcpy(node->string, string, n + 1);
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52 return *result = node->string, node;
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53 }
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55 static js_StringNode *jsS_skew(js_StringNode *node)
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56 {
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57 if (node->left->level == node->level) {
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58 js_StringNode *temp = node;
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59 node = node->left;
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60 temp->left = node->right;
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61 node->right = temp;
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62 }
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63 return node;
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64 }
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65
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66 static js_StringNode *jsS_split(js_StringNode *node)
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67 {
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68 if (node->right->right->level == node->level) {
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69 js_StringNode *temp = node;
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70 node = node->right;
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71 temp->right = node->left;
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72 node->left = temp;
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73 ++node->level;
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74 }
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75 return node;
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76 }
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77
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78 static js_StringNode *jsS_insert(js_State *J, js_StringNode *node, const char *string, const char **result)
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79 {
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80 if (node != &jsS_sentinel) {
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81 int c = strcmp(string, node->string);
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82 if (c < 0)
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83 node->left = jsS_insert(J, node->left, string, result);
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84 else if (c > 0)
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85 node->right = jsS_insert(J, node->right, string, result);
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86 else
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87 return *result = node->string, node;
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88 node = jsS_skew(node);
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89 node = jsS_split(node);
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90 return node;
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91 }
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92 return jsS_newstringnode(J, string, result);
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93 }
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94
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95 static void dumpstringnode(js_StringNode *node, int level)
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96 {
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97 int i;
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98 if (node->left != &jsS_sentinel)
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99 dumpstringnode(node->left, level + 1);
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100 printf("%d: ", node->level);
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101 for (i = 0; i < level; ++i)
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102 putchar('\t');
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103 printf("'%s'\n", node->string);
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104 if (node->right != &jsS_sentinel)
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105 dumpstringnode(node->right, level + 1);
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106 }
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107
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108 void jsS_dumpstrings(js_State *J)
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109 {
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110 js_StringNode *root = J->strings;
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111 printf("interned strings {\n");
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112 if (root && root != &jsS_sentinel)
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113 dumpstringnode(root, 1);
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114 printf("}\n");
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115 }
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116
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117 static void jsS_freestringnode(js_State *J, js_StringNode *node)
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118 {
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119 if (node->left != &jsS_sentinel) jsS_freestringnode(J, node->left);
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120 if (node->right != &jsS_sentinel) jsS_freestringnode(J, node->right);
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121 js_free(J, node);
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122 }
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123
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124 void jsS_freestrings(js_State *J)
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125 {
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126 if (J->strings && J->strings != &jsS_sentinel)
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127 jsS_freestringnode(J, J->strings);
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128 }
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129
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130 const char *js_intern(js_State *J, const char *s)
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131 {
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132 const char *result;
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133 if (!J->strings)
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134 J->strings = &jsS_sentinel;
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135 J->strings = jsS_insert(J, J->strings, s, &result);
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136 return result;
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137 }