1 /* ------------------------------------------------
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2 Copyright 2014 AT&T Intellectual Property
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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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7 http://www.apache.org/licenses/LICENSE-2.0
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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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19 flex -PNicParser -oniclexer.cc nic.l
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25 * AT&T lex can't handle this lexer due to lex bugs. It works with flex
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26 * 2.3.7, pclex 2.0.5, and MKS lex 3.1a.
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29 #include "nic_def.h"
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34 #include "nic.tab.cc.h"
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37 Some includes that flex doesn't include as standard,
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38 but which are needed.
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45 // Prevent flex from defining yywrap as extern "C"
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47 #define YY_SKIP_YYWRAP
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49 /* No lex lib, supply the yywrap fcn. that normally resides there
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52 int NicParserwrap(){return(1);}
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54 extern int NicParserdebug;
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58 These variables are used for error reporting:
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59 flex_nic_lineno : the line currently being parsed when the error occurs.
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60 flex_nic_ch : the character on the line where the error occurs
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61 flex_nic_linebuf : store the line for reporting.
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63 NOTE : 1) the fixed size flex_nic_linebuf buffer is dangerous.
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64 2) You might get pointed to a place shortly after
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65 where the syntax error occurs. It is close enough
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69 int flex_nic_lineno = 1;
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70 int flex_nic_ch = 0;
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71 char flex_nic_linebuf[20000];
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73 char *flex_nic_stringinput = NULL;
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74 int flex_nic_stringinput_ptr = 0;
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75 FILE *flex_nic_fileinput = NULL;
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76 int my_NicParser_yyinput(char *buf, int max_size);
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80 void NicParsererror(char *s){
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82 fprintf(stderr,"On line %d, char %d: %s (token %s):\n%s\n",
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83 flex_nic_lineno, flex_nic_ch, s, NicParsertext, flex_nic_linebuf );
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84 for(i=0;i<flex_nic_ch;i++){
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85 if(flex_nic_linebuf[i] == '\t'){
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86 fprintf(stderr,"\t");
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88 fprintf(stderr," ");
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91 fprintf(stderr,"^\n");
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92 // fprintf(stderr,"%*s\n",1+flex_nic_ch,"^");
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96 #define YY_INPUT(b, r, ms) (r = my_NicParser_yyinput(b,ms))
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99 /* MKS needs the next line to increase the NFA table */
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105 /* literal keyword tokens */
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108 The actions associated with each text token are to
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109 keep track of the current location (for syntax error reporting)
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110 and to report any necessary info to the emf.y parse tree builder
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112 Its likely that there are a number of omissions, inconsistencies
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113 (some keywords do not need to be in caps), and relics
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114 (keywords such as BETWEEN, INDICATOR, etc., are not used
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116 This parser is somewhat of a work in progress.
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119 /* Query keywords */
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121 OPTIONS: { flex_nic_ch+=NicParserleng; return OPTIONS; }
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122 FUNCTIONS: { flex_nic_ch+=NicParserleng; return FUNC; }
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123 TYPES: { flex_nic_ch+=NicParserleng; return TYPES; }
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124 UNARY_OPS: { flex_nic_ch+=NicParserleng; return UNARY_OPS; }
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125 BINARY_OPS: { flex_nic_ch+=NicParserleng; return BINARY_OPS; }
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126 MISSING_FIELDS: { flex_nic_ch+=NicParserleng; return FIELDS; }
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128 [;,=] { flex_nic_ch+=NicParserleng; return yytext[0]; }
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132 [A-Za-z_][A-Za-z0-9_]* { flex_nic_ch+=NicParserleng; NicParserlval.strval = strdup(yytext); return NAME; }
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141 NicParserlval.strval = strdup(NicParsertext+1);
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145 unput(c); /* just peeking */
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147 flex_nic_ch+=NicParserleng;
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148 NicParserlval.strval[NicParserleng-2] = '\0';
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149 return STRING_TOKEN;
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154 '[^'\n]*$ { flex_nic_ch+=NicParserleng; NicParsererror("Unterminated string"); }
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157 /* Newline : advance the error reporting line number */
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158 /* and grab the next line into flex_nic_linebuf */
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161 \n.* {flex_nic_ch=0; flex_nic_lineno++;
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162 strcpy(flex_nic_linebuf,NicParsertext+1);
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166 [ \t\r]+ {flex_nic_ch+=NicParserleng; } /* white space */
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168 "--".*$ {flex_nic_ch+=NicParserleng; }; /* comment */
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169 "//".*$ {flex_nic_ch+=NicParserleng; }; /* comment */
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171 .|\n {flex_nic_ch+=NicParserleng; fprintf(stderr,"Warning: unknown token (ignored)\n"); NicParsererror(yytext);}
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175 int my_NicParser_yyinput(char *buf, int max_size){
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179 if(flex_nic_stringinput != NULL){
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181 if(flex_nic_stringinput[flex_nic_stringinput_ptr] != '\0'){
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182 buf[c++] = flex_nic_stringinput[flex_nic_stringinput_ptr++];
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190 if(flex_nic_fileinput != NULL){
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191 while(c < max_size){
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192 inchar = getc(flex_nic_fileinput);
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205 void NicParser_setfileinput(FILE *f){
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206 NicParserrestart(NULL);
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208 flex_nic_fileinput = f;
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209 flex_nic_stringinput = NULL;
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210 flex_nic_lineno = 1;
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214 void NicParser_setstringinput(char *s){
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215 NicParserrestart(NULL);
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217 flex_nic_fileinput = NULL;
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218 flex_nic_stringinput = s;
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219 flex_nic_stringinput_ptr = 0;
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220 flex_nic_lineno = 1;
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