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46 lines
1.3 KiB
46 lines
1.3 KiB
%option 8bit reentrant |
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%option warn |
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%option yylineno |
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%option noyywrap |
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%option prefix="gmt_filter_headfoot" |
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%option extra-type="std::string*" |
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%option nounput |
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%x NOTCOMMENTS |
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%x SETUP |
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%x ENDHEAD |
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%x ENDFOOTER |
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%{ |
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#include <string> |
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// flex use register keyword, but it deprecated in C++11. |
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#define register |
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// Get rid of warning on unused function |
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#define YY_NO_INPUT |
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// struct yyguts_t defined in each flex output file, this emits warning at linking stage |
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#define yyguts_t gmt_filter_headfootguts_t |
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#define yyterminate {return 0;} |
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%} |
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/* |
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For header: |
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1. Remove all comments from begin to %%EndComments inclusively |
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2. Remove %%Page, %%BeginPageSetup, %%EndPageSetup DSC comments |
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3. Remove all content between %%BeginSetup and %%EndSetup (skip setpagedevice) |
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4. Skip code after %%EndPageSetup (draw code) |
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For footer: |
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1. Remove all before %%PageTrailer, but not %%PageTrailer itself |
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*/ |
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%% |
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<INITIAL>%%EndComments\n BEGIN(NOTCOMMENTS); |
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<INITIAL>%%PageTrailer\n yyextra->append(yytext,yyleng); BEGIN(ENDFOOTER); |
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<NOTCOMMENTS>%%Page:.*\n |
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<NOTCOMMENTS>%%BeginPageSetup.*\n |
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<NOTCOMMENTS>%%EndPageSetup.*\n BEGIN(ENDHEAD); |
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<NOTCOMMENTS>%%BeginSetup.*\n BEGIN(SETUP); |
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<NOTCOMMENTS,ENDFOOTER>.*\n yyextra->append(yytext,yyleng); |
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<SETUP>%%EndSetup.*\n BEGIN(NOTCOMMENTS); |
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<INITIAL,SETUP,ENDHEAD>.*\n |
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<*><<EOF>> yyterminate; |
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%%
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