203 lines
6.3 KiB
C++
203 lines
6.3 KiB
C++
/* file expect_expr_xs.cpp
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*
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* author: Roland Conybeare
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*/
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#include "expect_expr_xs.hpp"
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#include "parserstatemachine.hpp"
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#include "exprstatestack.hpp"
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#include "lambda_xs.hpp"
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#include "define_xs.hpp"
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#include "paren_xs.hpp"
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#include "sequence_xs.hpp"
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#include "progress_xs.hpp"
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#include "xo/expression/Lambda.hpp"
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#include "xo/expression/Constant.hpp"
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namespace xo {
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using xo::ast::Constant;
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namespace scm {
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std::unique_ptr<expect_expr_xs>
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expect_expr_xs::make(bool allow_defs,
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bool cxl_on_rightbrace)
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{
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return std::make_unique<expect_expr_xs>(expect_expr_xs(allow_defs,
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cxl_on_rightbrace));
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}
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void
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expect_expr_xs::start(bool allow_defs,
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bool cxl_on_rightbrace,
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parserstatemachine * p_psm) {
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p_psm->push_exprstate(expect_expr_xs::make(allow_defs,
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cxl_on_rightbrace));
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}
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void
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expect_expr_xs::start(parserstatemachine * p_psm) {
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start(false /*!allow_defs*/,
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false /*!cxl_on_rightbrace*/,
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p_psm);
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}
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expect_expr_xs::expect_expr_xs(bool allow_defs,
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bool cxl_on_rightbrace)
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: exprstate(exprstatetype::expect_rhs_expression),
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allow_defs_{allow_defs},
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cxl_on_rightbrace_{cxl_on_rightbrace}
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{}
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void
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expect_expr_xs::on_def_token(const token_type & tk,
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parserstatemachine * p_psm)
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{
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if (allow_defs_)
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define_xs::start(p_psm);
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else
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exprstate::on_def_token(tk, p_psm);
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}
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void
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expect_expr_xs::on_lambda_token(const token_type & /*tk*/,
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parserstatemachine * p_psm)
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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";
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lambda_xs::start(p_psm);
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}
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void
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expect_expr_xs::on_leftparen_token(const token_type & /*tk*/,
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parserstatemachine * p_psm)
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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";
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/* push lparen_0 to remember to look for subsequent rightparen. */
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paren_xs::start(p_psm);
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}
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void
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expect_expr_xs::on_leftbrace_token(const token_type & /*tk*/,
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parserstatemachine * p_psm)
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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";
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/* push lparen_0 to remember to look for subsequent rightparen. */
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sequence_xs::start(p_psm);
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}
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void
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expect_expr_xs::on_rightbrace_token(const token_type & tk,
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parserstatemachine * p_psm)
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{
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if (cxl_on_rightbrace_) {
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auto self = p_psm->pop_exprstate();
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/* do not call .on_expr(), since '}' cancelled */
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p_psm->top_exprstate().on_rightbrace_token(tk, p_psm);
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} else {
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exprstate::on_rightbrace_token(tk, p_psm);
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}
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}
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void
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expect_expr_xs::on_symbol_token(const token_type & tk,
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parserstatemachine * p_psm)
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{
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/* todo: treat symbol as variable name */
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/* various possibilities when looking for rhs expression:
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*
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* x := y // (1)
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* x := f(a) // (2)
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* x := f(a,b) // (3)
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*
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* need lookahead token following symbol to distinguish
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* between (1) (symbol completes rhs expression)
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* and {(2), (3)} (symbol is function call)
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*/
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rp<Variable> var = p_psm->lookup_var(tk.text());
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if (!var) {
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throw std::runtime_error
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(tostr("expect_expr_xs::on_symbol_token",
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": unknown symbol",
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xtag("name", tk.text())));
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}
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/* e.g.
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* def pi = 3.14159265;
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* def mypi = pi;
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* ^
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* def pi2 = pi * 2;
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* ^
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* def y = foo(pi2);
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* ^
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*/
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progress_xs::start(var, p_psm);
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#ifdef NOT_YET
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p_stack->push_exprstate(exprstate(exprstatetype::expr_progress,
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Variable::make(name, type)));
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#endif
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#ifdef LATER
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p_psm->pop_exprstate();
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p_psm->top_exprstate().on_symbol(tk.text(),
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p_stack, p_emit_expr);
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#endif
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return;
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}
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void
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expect_expr_xs::on_f64_token(const token_type & tk,
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parserstatemachine * p_psm)
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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_token";
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/* e.g.
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* def pi = 3.14159265;
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* \---tk---/
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*/
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progress_xs::start
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(Constant<double>::make(tk.f64_value()),
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p_psm);
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}
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void
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expect_expr_xs::on_expr(ref::brw<Expression> expr,
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parserstatemachine * p_psm)
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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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std::unique_ptr<exprstate> self = p_psm->pop_exprstate();
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p_psm->top_exprstate().on_expr(expr, p_psm);
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} /*on_expr*/
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} /*namespace scm*/
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} /*namespace xo*/
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/* end expect_expr_xs.cpp */
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