Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/gumbo-parser/src/utf8.h @ 20:eb3dd22fef2c

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FIX: the new "sdist" build target is PHONY also
author Franz Glasner <fzglas.hg@dom66.de>
date Thu, 18 Sep 2025 22:04:13 +0200
parents b50eed0cc0ef
children
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1 // Copyright 2010 Google Inc. All Rights Reserved.
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2 //
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3 // Licensed under the Apache License, Version 2.0 (the "License");
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4 // you may not use this file except in compliance with the License.
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5 // You may obtain a copy of the License at
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6 //
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7 // http://www.apache.org/licenses/LICENSE-2.0
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8 //
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9 // Unless required by applicable law or agreed to in writing, software
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10 // distributed under the License is distributed on an "AS IS" BASIS,
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11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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12 // See the License for the specific language governing permissions and
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13 // limitations under the License.
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14 //
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15 // Author: jdtang@google.com (Jonathan Tang)
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16 //
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17 // This contains an implementation of a UTF8 iterator and decoder suitable for
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18 // an HTML5 parser. This does a bit more than straight UTF-8 decoding. The
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19 // HTML5 spec specifies that:
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20 // 1. Decoding errors are parse errors.
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21 // 2. Certain other codepoints (eg. control characters) are parse errors.
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22 // 3. Carriage returns and CR/LF groups are converted to line feeds.
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23 // http://www.whatwg.org/specs/web-apps/current-work/multipage/infrastructure.html#decoded-as-utf-8,-with-error-handling
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24 //
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25 // Also, we want to keep track of source positions for error handling. As a
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26 // result, we fold all that functionality into this decoder, and can't use an
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27 // off-the-shelf library.
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28 //
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29 // This header is internal-only, which is why we prefix functions with only
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30 // utf8_ or utf8_iterator_ instead of gumbo_utf8_.
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32 #ifndef GUMBO_UTF8_H_
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33 #define GUMBO_UTF8_H_
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35 #include <stdbool.h>
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36 #include <stddef.h>
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38 #include "gumbo.h"
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40 #ifdef __cplusplus
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41 extern "C" {
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42 #endif
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44 struct GumboInternalError;
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45 struct GumboInternalParser;
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47 // Unicode replacement char.
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48 extern const int kUtf8ReplacementChar;
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50 typedef struct GumboInternalUtf8Iterator {
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51 // Points at the start of the code point most recently read into 'current'.
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52 const char* _start;
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54 // Points at the mark. The mark is initially set to the beginning of the
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55 // input.
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56 const char* _mark;
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58 // Points past the end of the iter, like a past-the-end iterator in the STL.
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59 const char* _end;
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61 // The code point under the cursor.
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62 int _current;
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64 // The width in bytes of the current code point.
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65 int _width;
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67 // The SourcePosition for the current location.
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68 GumboSourcePosition _pos;
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70 // The SourcePosition for the mark.
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71 GumboSourcePosition _mark_pos;
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73 // Pointer back to the GumboParser instance, for configuration options and
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74 // error recording.
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75 struct GumboInternalParser* _parser;
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76 } Utf8Iterator;
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78 // Returns true if this Unicode code point is in the list of characters
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79 // forbidden by the HTML5 spec, such as NUL bytes and undefined control chars.
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80 bool utf8_is_invalid_code_point(int c);
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82 // Initializes a new Utf8Iterator from the given byte buffer. The source does
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83 // not have to be NUL-terminated, but the length must be passed in explicitly.
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84 void utf8iterator_init(struct GumboInternalParser* parser, const char* source,
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85 size_t source_length, Utf8Iterator* iter);
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87 // Advances the current position by one code point.
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88 void utf8iterator_next(Utf8Iterator* iter);
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90 // Returns the current code point as an integer.
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91 int utf8iterator_current(const Utf8Iterator* iter);
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93 // Retrieves and fills the output parameter with the current source position.
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94 void utf8iterator_get_position(
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95 const Utf8Iterator* iter, GumboSourcePosition* output);
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97 // Retrieves a character pointer to the start of the current character.
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98 const char* utf8iterator_get_char_pointer(const Utf8Iterator* iter);
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99
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100 // Retrieves a character pointer to 1 past the end of the buffer. This is
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101 // necessary for certain state machines and string comparisons that would like
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102 // to look directly for ASCII text in the buffer without going through the
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103 // decoder.
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104 const char* utf8iterator_get_end_pointer(const Utf8Iterator* iter);
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105
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106 // If the upcoming text in the buffer matches the specified prefix (which has
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107 // length 'length'), consume it and return true. Otherwise, return false with
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108 // no other effects. If the length of the string would overflow the buffer,
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109 // this returns false. Note that prefix should not contain null bytes because
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110 // of the use of strncmp/strncasecmp internally. All existing use-cases adhere
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111 // to this.
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112 bool utf8iterator_maybe_consume_match(
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113 Utf8Iterator* iter, const char* prefix, size_t length, bool case_sensitive);
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114
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115 // "Marks" a particular location of interest in the input stream, so that it can
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116 // later be reset() to. There's also the ability to record an error at the
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117 // point that was marked, as oftentimes that's more useful than the last
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118 // character before the error was detected.
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119 void utf8iterator_mark(Utf8Iterator* iter);
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120
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121 // Returns the current input stream position to the mark.
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122 void utf8iterator_reset(Utf8Iterator* iter);
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123
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124 // Sets the position and original text fields of an error to the value at the
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125 // mark.
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126 void utf8iterator_fill_error_at_mark(
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127 Utf8Iterator* iter, struct GumboInternalError* error);
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128
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129 #ifdef __cplusplus
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130 }
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131 #endif
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132 #endif // GUMBO_UTF8_H_