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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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20 02110-1301, USA. |
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21 |
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22 */ |
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23 |
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24 #if !defined (octave_lex_h) |
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25 #define octave_lex_h 1 |
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26 |
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27 // FIXME -- these input buffer things should be members of a |
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28 // parser input stream class. |
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29 |
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30 typedef struct yy_buffer_state *YY_BUFFER_STATE; |
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31 |
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32 // Associate a buffer with a new file to read. |
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33 extern YY_BUFFER_STATE create_buffer (FILE *f); |
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34 |
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35 // Report the current buffer. |
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36 extern YY_BUFFER_STATE current_buffer (void); |
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37 |
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38 // Connect to new buffer buffer. |
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39 extern void switch_to_buffer (YY_BUFFER_STATE buf); |
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40 |
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41 // Delete a buffer. |
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42 extern void delete_buffer (YY_BUFFER_STATE buf); |
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43 |
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44 // Restore a buffer (for unwind-prot). |
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45 extern void restore_input_buffer (void *buf); |
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46 |
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47 // Delete a buffer (for unwind-prot). |
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48 extern void delete_input_buffer (void *buf); |
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49 |
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50 // Is the given string a keyword? |
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51 extern bool is_keyword (const std::string& s); |
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52 |
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53 // For communication between the lexer and parser. |
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54 |
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55 class |
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56 lexical_feedback |
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57 { |
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58 public: |
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59 |
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60 lexical_feedback (void) { init (); } |
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61 |
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62 ~lexical_feedback (void) { } |
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63 |
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64 void init (void); |
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65 |
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66 // Square bracket level count. |
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67 int bracketflag; |
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68 |
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69 // Curly brace level count. |
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70 int braceflag; |
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71 |
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72 // TRUE means we're in the middle of defining a loop. |
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73 int looping; |
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74 |
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75 // TRUE means we think we are looking at the beginning of a |
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76 // function definition. |
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77 bool beginning_of_function; |
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78 |
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79 // TRUE means that we should convert spaces to a comma inside a |
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80 // matrix definition. |
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81 bool convert_spaces_to_comma; |
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82 |
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83 // TRUE means we're in the middle of defining a function. |
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84 bool defining_func; |
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85 |
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86 // Nonzero means we are parsing a function handle. |
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87 int looking_at_function_handle; |
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88 |
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89 // TRUE means we're parsing the return list for a function. |
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90 bool looking_at_return_list; |
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91 |
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92 // TRUE means we're parsing the parameter list for a function. |
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93 bool looking_at_parameter_list; |
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94 |
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95 // TRUE means we're parsing a matrix or the left hand side of |
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96 // multi-value assignment statement. |
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97 bool looking_at_matrix_or_assign_lhs; |
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98 |
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99 // Nonzero means we're parsing an indexing operation for an object. |
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100 int looking_at_object_index; |
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101 |
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102 // GAG. Stupid kludge so that [[1,2][3,4]] will work. |
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103 bool do_comma_insert; |
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104 |
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105 // TRUE means we're doing a raw input command. |
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106 bool doing_rawcommand; |
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107 |
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108 // TRUE means we're looking at an indirect reference to a |
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109 // structure element. |
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110 bool looking_at_indirect_ref; |
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111 |
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112 // TRUE means that we've already seen the name of this function. |
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113 // Should only matter if defining_func is also TRUE. |
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114 bool parsed_function_name; |
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115 |
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116 // Are we parsing a nested function? |
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117 // 1 ==> Yes. |
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118 // 0 ==> No. |
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119 // -1 ==> Yes, but it is the last one because we have seen EOF. |
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120 int parsing_nested_function; |
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121 |
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122 // Return transpose or start a string? |
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123 bool quote_is_transpose; |
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124 |
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125 private: |
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126 |
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127 lexical_feedback (const lexical_feedback&); |
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128 |
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129 lexical_feedback& operator = (const lexical_feedback&); |
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130 }; |
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131 |
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132 // TRUE means that we have encountered EOF on the input stream. |
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133 extern bool parser_end_of_input; |
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134 |
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135 // Flags that need to be shared between the lexer and parser. |
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136 extern lexical_feedback lexer_flags; |
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137 |
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138 #endif |
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139 |
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140 /* |
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141 ;;; Local Variables: *** |
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142 ;;; mode: C++ *** |
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143 ;;; End: *** |
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144 */ |
