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v4 preprocessor/macro: cosmetic changes in the stack used for nested includes 

git-svn-id: https://www.dynare.org/svn/dynare/dynare_v4@1720 ac1d8469-bf42-47a9-8791-bf33cf982152
issue#70
sebastien 2008-02-22 14:03:46 +00:00
parent ceee9628ed
commit 818e571fdc
2 changed files with 20 additions and 22 deletions
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13
macro/MacroDriver.hh
View File

@ -48,10 +48,12 @@ using namespace std;
class MacroFlex : public MacroFlexLexer
{
private:
//! The stack of scanner states
/*! We could have used instead yypush_buffer_state() and yypop_buffer_state(),
but those functions do not exist in Flex 2.5.4 */
stack<struct yy_buffer_state *> state_stack;
//! The stack used to handle (possibly nested) includes
/*! Keeps track of buffer state and associated location, as they were just before switching to
included file.
Note that we could have used yypush_buffer_state() and yypop_buffer_state()
instead of a stack for buffer states, but those functions do not exist in Flex 2.5.4 */
stack<pair<struct yy_buffer_state *, Macro::parser::location_type> > include_stack;
public:
MacroFlex(istream* in = 0, ostream* out = 0);
@ -89,9 +91,6 @@ public:
//! Pointer to keep track of the input file stream currently scanned
ifstream *ifs;
//! Stack of locations used for (possibly nested) includes
stack<Macro::parser::location_type> loc_stack;
//! Name of main file being parsed
string file;

29
macro/MacroFlex.ll
View File

@ -68,20 +68,19 @@ typedef Macro::parser::token token;
driver.ifs = new ifstream(yytext, ios::binary);
if (driver.ifs->fail())
driver.error(*yylloc, "Could not open " + string(yytext));
// Save old location
// Save old buffer state and location
/* We don't use yypush_buffer_state(), since it doesn't exist in
Flex 2.5.4 (see Flex 2.5.33 info file - section 11 - for code
example with yypush_buffer_state()) */
yylloc->step();
driver.loc_stack.push(*yylloc);
include_stack.push(make_pair(YY_CURRENT_BUFFER, *yylloc));
// Reset location
yylloc->begin.filename = yylloc->end.filename = new string(yytext);
yylloc->begin.line = yylloc->end.line = 1;
yylloc->begin.column = yylloc->end.column = 0;
// Display @line
// Output @line information
*yyout << "@line \"" << *yylloc->begin.filename << "\" 1" << endl;
// Switch to new buffer
/* We don't use yypush_buffer_state(), since it doesn't exist in
Flex 2.5.4 (see Flex 2.5.33 info file - section 11 - for code
example with yypush_buffer_state()) */
state_stack.push(YY_CURRENT_BUFFER);
yy_switch_to_buffer(yy_create_buffer(driver.ifs, YY_BUF_SIZE));
BEGIN(INITIAL);
}
@ -142,22 +141,22 @@ typedef Macro::parser::token token;
<<EOF>> {
/* We don't use yypop_buffer_state(), since it doesn't exist in
Flex 2.5.4 (see Flex 2.5.33 info file - section 11 - for code
example with yypop_buffer_state()) */
// Quit lexer if end of main file
if (state_stack.empty())
if (include_stack.empty())
{
yyterminate();
}
// Else restore old flex buffer
/* We don't use yypop_buffer_state(), since it doesn't exist in
Flex 2.5.4 (see Flex 2.5.33 info file - section 11 - for code
example with yypop_buffer_state()) */
yy_delete_buffer(YY_CURRENT_BUFFER);
yy_switch_to_buffer(state_stack.top());
state_stack.pop();
yy_switch_to_buffer(include_stack.top().first);
// And restore old location
delete yylloc->begin.filename;
*yylloc = driver.loc_stack.top();
driver.loc_stack.pop();
*yylloc = include_stack.top().second;
// Remove top of stack
include_stack.pop();
BEGIN(END_INCLUDE);
}