74 lines
2.4 KiB
C++
74 lines
2.4 KiB
C++
/** @file exprseq_xs.hpp
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*
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* Author: Roland Conybeare
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**/
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#pragma once
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#include "exprstate.hpp"
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//#include <cstdint>
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namespace xo {
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namespace scm {
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enum class exprseqtype {
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/** toplevel interactive sequence. Most permissive **/
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toplevel_interactive,
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/** toplevel non-interactive sequence.
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* This used for top-level expressions in a translation unit.
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**/
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toplevel_batch,
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/** nested sequence, for example in function body **/
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nested,
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};
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/** @class exprseq_xs
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* @brief parsing state-machine for top-level expression sequence
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*
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* expression sequences come in several types:
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* 1. top-level interactive
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* 2. top-level batch
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* 3. nested
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*
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* 1 2 3
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* +--------
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* def | y y y
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* symbol | y n n 1: evaluate as variable
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* i64 | y n n 1: evaluate as constant
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*
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**/
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class exprseq_xs : public exprstate {
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public:
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explicit exprseq_xs(exprseqtype seqtype);
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static void start(exprseqtype seqtype, parserstatemachine * p_psm);
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public:
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// ----- token input methods -----
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virtual void on_def_token(const token_type & tk,
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parserstatemachine * p_psm) override;
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virtual void on_symbol_token(const token_type & tk,
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parserstatemachine * p_psm) override;
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virtual void on_i64_token(const token_type & tk,
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parserstatemachine * p_psm) override;
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// ----- victory methods -----
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virtual void on_typedescr(TypeDescr td,
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parserstatemachine * p_psm) override;
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virtual void on_expr(bp<Expression> expr,
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parserstatemachine * p_psm) override;
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virtual void on_expr_with_semicolon(bp<Expression> expr,
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parserstatemachine * p_psm) override;
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private:
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static std::unique_ptr<exprseq_xs> make(exprseqtype seqtype);
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/** context for this expression sequence **/
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exprseqtype xseqtype_;
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};
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} /*namespace scm*/
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} /*namespace xo*/
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/** end exprseq_xs.hpp **/
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