357 lines
11 KiB
C++
357 lines
11 KiB
C++
/* @file exprstate.cpp */
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#include "exprstate.hpp"
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#include "define_xs.hpp"
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#include "progress_xs.hpp"
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#include "paren_xs.hpp"
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#include "expect_expr_xs.hpp"
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#include "xo/expression/Constant.hpp"
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#include "xo/reflect/Reflect.hpp"
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namespace xo {
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using xo::ast::Constant;
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using xo::reflect::Reflect;
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using xo::reflect::TypeDescr;
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namespace scm {
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const char *
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exprstatetype_descr(exprstatetype x) {
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switch (x) {
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case exprstatetype::invalid:
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return "?invalid";
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case exprstatetype::expect_toplevel_expression_sequence:
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return "expect_toplevel_expression_sequence";
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case exprstatetype::defexpr:
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return "defexpr";
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case exprstatetype::parenexpr:
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return "parenexpr";
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case exprstatetype::expect_rhs_expression:
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return "expect_rhs_expression";
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case exprstatetype::expect_symbol:
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return "expect_symbol";
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case exprstatetype::expect_type:
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return "expect_type";
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case exprstatetype::expr_progress:
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return "expr_progress";
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case exprstatetype::n_exprstatetype:
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break;
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}
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return "???";
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}
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void
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exprstate::on_def_token(const token_type & tk,
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exprstatestack * /*p_stack*/)
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{
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this->illegal_input_error("exprstate::on_def_token", tk);
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}
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void
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exprstate::on_symbol_token(const token_type & tk,
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exprstatestack * p_stack,
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rp<Expression> * /*p_emit_expr*/)
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{
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constexpr bool c_debug_flag = true;
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scope log(XO_DEBUG(c_debug_flag));
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log && log(xtag("exstype", p_stack->top_exprstate().exs_type()));
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constexpr const char * c_self_name = "exprstate::on_symbol_token";
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this->illegal_input_error(c_self_name, tk);
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}
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void
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exprstate::on_typedescr(TypeDescr /*td*/,
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exprstatestack * /*p_stack*/,
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rp<Expression> * /*p_emit_expr*/)
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{
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/* returning type description to something that wants it */
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/* unreachable - implement in derived class */
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assert(false);
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return;
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}
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void
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exprstate::on_colon_token(const token_type & /*tk*/,
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exprstatestack * /*p_stack*/)
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{
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constexpr bool c_debug_flag = true;
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scope log(XO_DEBUG(c_debug_flag));
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constexpr const char * self_name = "exprstate::on_colon";
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/* lots of illegal states */
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throw std::runtime_error(tostr(self_name,
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": unexpected colon for parsing state",
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xtag("state", *this)));
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assert(false);
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}
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void
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exprstate::on_semicolon_token(const token_type & /*tk*/,
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exprstatestack * /*p_stack*/,
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rp<Expression> * /*p_emit_expr*/)
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{
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constexpr bool c_debug_flag = true;
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scope log(XO_DEBUG(c_debug_flag));
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constexpr const char * self_name = "exprstate::on_semicolon";
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throw std::runtime_error(tostr(self_name,
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": unexpected semicolon for parsing state",
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xtag("state", *this)));
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}
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void
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exprstate::on_singleassign_token(const token_type & /*tk*/,
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exprstatestack * /*p_stack*/) {
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constexpr bool c_debug_flag = true;
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scope log(XO_DEBUG(c_debug_flag));
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constexpr const char * self_name = "exprstate::on_singleassign_token";
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throw std::runtime_error(tostr(self_name,
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": unexpected equals for parsing state",
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xtag("state", *this)));
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}
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void
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exprstate::on_leftparen_token(const token_type & tk,
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exprstatestack * /*p_stack*/,
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rp<Expression> * /*p_emit_expr*/)
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{
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constexpr bool c_debug_flag = true;
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scope log(XO_DEBUG(c_debug_flag));
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constexpr const char * self_name = "exprstate::on_leftparen_token";
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this->illegal_input_error(self_name, tk);
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}
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void
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exprstate::on_rightparen_token(const token_type & tk,
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exprstatestack * /*p_stack*/,
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rp<Expression> * /*p_emit_expr*/)
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{
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constexpr bool c_debug_flag = true;
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scope log(XO_DEBUG(c_debug_flag));
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constexpr const char * self_name = "exprstate::on_rightparen";
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this->illegal_input_error(self_name, tk);
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}
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void
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exprstate::on_f64_token(const token_type & tk,
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exprstatestack * /*p_stack*/,
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rp<Expression> * /*p_emit_expr*/)
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{
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constexpr bool c_debug_flag = true;
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scope log(XO_DEBUG(c_debug_flag));
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constexpr const char * self_name = "exprstate::on_f64";
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this->illegal_input_error(self_name, tk);
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}
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void
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exprstate::on_input(const token_type & tk,
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exprstatestack * p_stack,
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rp<Expression> * p_emit_expr)
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{
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constexpr bool c_debug_flag = true;
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scope log(XO_DEBUG(c_debug_flag));
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log && log(xtag("tk", tk));
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log && log(xtag("state", *this));
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switch (tk.tk_type()) {
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case tokentype::tk_def:
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this->on_def_token(tk, p_stack);
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return;
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case tokentype::tk_i64:
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assert(false);
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return;
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case tokentype::tk_f64:
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this->on_f64_token(tk, p_stack, p_emit_expr);
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return;
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case tokentype::tk_string:
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assert(false);
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return;
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case tokentype::tk_symbol:
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this->on_symbol_token(tk, p_stack, p_emit_expr);
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return;
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case tokentype::tk_leftparen:
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this->on_leftparen_token(tk, p_stack, p_emit_expr);
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return;
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case tokentype::tk_rightparen:
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this->on_rightparen_token(tk, p_stack, p_emit_expr);
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return;
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case tokentype::tk_leftbracket:
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case tokentype::tk_rightbracket:
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case tokentype::tk_leftbrace:
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case tokentype::tk_rightbrace:
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case tokentype::tk_leftangle:
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case tokentype::tk_rightangle:
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case tokentype::tk_dot:
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case tokentype::tk_comma:
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assert(false);
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return;
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case tokentype::tk_colon:
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this->on_colon_token(tk, p_stack);
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return;
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case tokentype::tk_doublecolon:
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assert(false);
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return;
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case tokentype::tk_semicolon:
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this->on_semicolon_token(tk, p_stack, p_emit_expr);
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return;
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case tokentype::tk_singleassign:
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this->on_singleassign_token(tk, p_stack);
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return;
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case tokentype::tk_assign:
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case tokentype::tk_yields:
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case tokentype::tk_type:
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case tokentype::tk_lambda:
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case tokentype::tk_if:
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case tokentype::tk_let:
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case tokentype::tk_in:
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case tokentype::tk_end:
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assert(false);
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return;
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case tokentype::tk_invalid:
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case tokentype::n_tokentype:
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assert(false);
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return;
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}
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assert(false);
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}
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void
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exprstate::on_expr(ref::brw<Expression> expr,
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exprstatestack * /*p_stack*/,
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rp<Expression> * /*p_emit_expr*/)
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{
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constexpr bool c_debug_flag = true;
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scope log(XO_DEBUG(c_debug_flag));
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log && log(xtag("exstype", this->exs_type_),
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xtag("expr", expr));
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assert(false);
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} /*on_expr*/
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void
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exprstate::on_symbol(const std::string & /*symbol_name*/,
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exprstatestack * /*p_stack*/,
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rp<Expression> * /*p_emit_expr*/)
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{
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/* unreachable - derived class that can receive
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* will override this method
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*/
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assert(false);
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}
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void
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exprstate::print(std::ostream & os) const {
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os << "<exprstate"
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<< xtag("type", exs_type_);
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os << ">";
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}
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void
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exprstate::illegal_input_error(const char * self_name,
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const token_type & tk) const
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{
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throw std::runtime_error
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(tostr(self_name,
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": unexpected input token for parsing state",
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xtag("token", tk),
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xtag("state", *this)));
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}
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// ----- exprstatestack -----
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exprstate &
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exprstatestack::top_exprstate() {
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std::size_t z = stack_.size();
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if (z == 0) {
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throw std::runtime_error
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("parser::top_exprstate: unexpected empty stack");
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}
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return *(stack_[z-1]);
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}
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void
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exprstatestack::push_exprstate(std::unique_ptr<exprstate> exs) {
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constexpr bool c_debug_flag = true;
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scope log(XO_DEBUG(c_debug_flag),
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xtag("exs", *exs));
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std::size_t z = stack_.size();
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stack_.resize(z+1);
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stack_[z] = std::move(exs);
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}
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std::unique_ptr<exprstate>
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exprstatestack::pop_exprstate() {
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constexpr bool c_debug_flag = true;
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scope log(XO_DEBUG(c_debug_flag),
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xtag("top.exstype", top_exprstate().exs_type()));
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std::size_t z = stack_.size();
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if (z > 0) {
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std::unique_ptr<exprstate> top = std::move(stack_[z-1]);
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stack_.resize(z-1);
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return top;
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} else {
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return nullptr;
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}
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}
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void
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exprstatestack::print(std::ostream & os) const {
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os << "<exprstatestack"
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<< xtag("size", stack_.size())
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<< std::endl;
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for (std::size_t i = 0, z = stack_.size(); i < z; ++i) {
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os << " [" << z-i-1 << "] "
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<< stack_[i]
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<< std::endl;
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}
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os << ">" << std::endl;
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}
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} /*namespace scm*/
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} /*namespace xo*/
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/* end exprstate.cpp */
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