100 lines
3.1 KiB
C++
100 lines
3.1 KiB
C++
/* @file lambda_xs.cpp */
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#include "lambda_xs.hpp"
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#include "parserstatemachine.hpp"
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#include "expect_formal_arglist_xs.hpp"
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#include "expect_expr_xs.hpp"
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#include "xo/expression/Lambda.hpp"
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namespace xo {
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using xo::ast::Lambda;
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namespace scm {
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std::unique_ptr<lambda_xs>
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lambda_xs::make() {
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return std::make_unique<lambda_xs>(lambda_xs());
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}
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void
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lambda_xs::start(exprstatestack * p_stack,
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rp<Expression> * p_emit_expr)
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{
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parserstatemachine psm(p_stack, p_emit_expr);
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p_stack->push_exprstate(lambda_xs::make());
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p_stack->top_exprstate()
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.on_lambda_token(token_type::lambda(), &psm);
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}
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lambda_xs::lambda_xs() : exprstate(exprstatetype::lambdaexpr) {}
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void
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lambda_xs::on_lambda_token(const token_type & tk,
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parserstatemachine * p_psm)
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{
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auto p_stack = p_psm->p_stack_;
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if (lmxs_type_ == lambdastatetype::lm_0) {
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this->lmxs_type_ = lambdastatetype::lm_1;
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expect_formal_arglist_xs::start(p_stack);
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} else {
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exprstate::on_lambda_token(tk, p_psm);
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}
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}
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void
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lambda_xs::on_formal_arglist(const std::vector<rp<Variable>> & argl,
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exprstatestack * p_stack,
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rp<Expression> * p_emit_expr)
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{
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if (lmxs_type_ == lambdastatetype::lm_1) {
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this->lmxs_type_ = lambdastatetype::lm_2;
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this->argl_ = argl;
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expect_expr_xs::start(p_stack);
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} else {
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exprstate::on_formal_arglist(argl, p_stack, p_emit_expr);
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}
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}
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void
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lambda_xs::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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if (lmxs_type_ == lambdastatetype::lm_2) {
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this->lmxs_type_ = lambdastatetype::lm_3;
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this->body_ = expr.promote();
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} else {
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exprstate::on_expr(expr, p_stack, p_emit_expr);
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}
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}
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void
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lambda_xs::on_semicolon_token(const token_type & tk,
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parserstatemachine * p_psm)
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{
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auto p_stack = p_psm->p_stack_;
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auto p_emit_expr = p_psm->p_emit_expr_;
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if (lmxs_type_ == lambdastatetype::lm_3) {
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/* done! */
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std::unique_ptr<exprstate> self = p_stack->pop_exprstate();
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std::string name = "fixmename";
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rp<Lambda> lm = Lambda::make(name, argl_, body_);
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p_stack->top_exprstate().on_expr(lm, p_stack, p_emit_expr);
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p_stack->top_exprstate().on_semicolon_token(tk, p_psm);
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return;
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}
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exprstate::on_semicolon_token(tk, p_psm);
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}
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} /*namespace scm*/
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} /*namespace xo*/
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/* end lambda_xs.cpp */
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