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Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
This commit is contained in:
Leonardo de Moura 2012-10-02 11:35:25 -07:00
parent 3f9edad676
commit e9eab22e5c
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lib/pp.cpp Normal file
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/*++
Copyright (c) 2006 Microsoft Corporation
Module Name:
pp.cpp
Abstract:
<abstract>
Author:
Leonardo de Moura (leonardo) 2008-01-20.
Revision History:
--*/
#include"pp.h"
using namespace format_ns;
pp_params g_pp_params;
void set_pp_default_params(pp_params const & p) {
g_pp_params = p;
}
void register_pp_params(ini_params & p) {
g_pp_params.register_params(p);
}
pp_params const & get_pp_default_params() {
return g_pp_params;
}
static std::pair<unsigned, bool> space_upto_line_break(ast_manager & m, format * f) {
unsigned r;
SASSERT(f->get_family_id() == fm(m).get_family_id("format"));
decl_kind k = f->get_decl_kind();
switch(k) {
case OP_STRING: {
size_t len = strlen(f->get_decl()->get_parameter(0).get_symbol().bare_str());
return std::make_pair(static_cast<unsigned>(len), false);
}
case OP_CHOICE:
return space_upto_line_break(m, to_app(f->get_arg(0)));
case OP_COMPOSE:
r = 0;
for (unsigned i = 0; i < f->get_num_args(); i++) {
std::pair<unsigned, bool> pair = space_upto_line_break(m, to_app(f->get_arg(i)));
r += pair.first;
if (pair.second)
return std::make_pair(r, true);
}
return std::make_pair(r, false);
case OP_INDENT:
return space_upto_line_break(m, to_app(f->get_arg(0)));
case OP_LINE_BREAK:
case OP_LINE_BREAK_EXT:
return std::make_pair(0, true);
default:
return std::make_pair(0, false);
}
}
inline bool fits(ast_manager & m, format * f, unsigned space_left) {
unsigned s = space_upto_line_break(m, f).first;
TRACE("fits", tout << "s: " << s << " space_left " << space_left << "\n";);
return s <= space_left;
}
void pp(std::ostream & out, format * f, ast_manager & m, pp_params const & p) {
unsigned pos = 0;
unsigned ribbon_pos = 0;
unsigned line = 0;
unsigned len;
unsigned i;
int space_left;
svector<std::pair<format *, unsigned> > todo;
todo.push_back(std::make_pair(f, 0));
app_ref space(mk_string(m, " "), fm(m));
while (!todo.empty()) {
if (line >= p.m_pp_max_num_lines)
return;
std::pair<format *, unsigned> pair = todo.back();
format * f = pair.first;
unsigned indent = pair.second;
todo.pop_back();
SASSERT(f->get_family_id() == fm(m).get_family_id("format"));
switch (f->get_decl_kind()) {
case OP_STRING:
if (p.m_pp_bounded && pos > p.m_pp_max_width)
break;
len = static_cast<unsigned>(strlen(f->get_decl()->get_parameter(0).get_symbol().bare_str()));
if (p.m_pp_bounded && pos + len > p.m_pp_max_width) {
out << "...";
break;
}
pos += len;
ribbon_pos += len;
out << f->get_decl()->get_parameter(0).get_symbol();
break;
case OP_INDENT:
todo.push_back(std::make_pair(to_app(f->get_arg(0)),
std::min(indent + f->get_decl()->get_parameter(0).get_int(),
p.m_pp_max_indent)));
break;
case OP_COMPOSE:
i = f->get_num_args();
while (i > 0) {
--i;
todo.push_back(std::make_pair(to_app(f->get_arg(i)), indent));
}
break;
case OP_CHOICE:
space_left = std::min(p.m_pp_max_width - pos, p.m_pp_max_ribbon - pos);
if (space_left > 0 && fits(m, to_app(f->get_arg(0)), space_left))
todo.push_back(std::make_pair(to_app(f->get_arg(0)), indent));
else
todo.push_back(std::make_pair(to_app(f->get_arg(1)), indent));
break;
case OP_LINE_BREAK:
case OP_LINE_BREAK_EXT:
if (p.m_pp_single_line) {
todo.push_back(std::make_pair(space, indent));
break;
}
pos = indent;
ribbon_pos = 0;
line++;
if (line < p.m_pp_max_num_lines) {
out << "\n";
for (unsigned i = 0; i < indent; i++)
out << " ";
}
else
out << "...\n";
break;
default:
break;
}
}
}
void pp(std::ostream & out, format_ns::format * f, ast_manager & m) {
pp(out, f, m, g_pp_params);
}