855 lines
26 KiB
Plaintext
855 lines
26 KiB
Plaintext
#include "<TBD>.h"
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#include <stdbool.h>
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/**************************************************************************
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* User code blocks
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*************************************************************************/
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<% @grammar.code_blocks.each do |code| %>
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<%= code %>
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<% end %>
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/**************************************************************************
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* Private types
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*************************************************************************/
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<% if @grammar.prefix.upcase != "P_" %>
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/* Result codes. */
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#define P_SUCCESS 0u
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#define P_DECODE_ERROR 1u
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#define P_UNEXPECTED_INPUT 2u
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#define P_UNEXPECTED_TOKEN 3u
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#define P_DROP 4u
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#define P_EOF 5u
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<% end %>
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/* An invalid ID value. */
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#define INVALID_ID ((size_t)-1)
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/**************************************************************************
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* State initialization
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*************************************************************************/
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/**
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* Initialize lexer/parser context structure.
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*
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* @param[out] context
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* Lexer/parser context structure.
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* @param input
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* Text input.
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* @param input_length
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* Text input length.
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*/
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void <%= @grammar.prefix %>context_init(<%= @grammar.prefix %>context_t * context, uint8_t const * input, size_t input_length)
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{
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/* New default-initialized context structure. */
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<%= @grammar.prefix %>context_t newcontext = {0};
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/* Lexer initialization. */
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newcontext.input = input;
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newcontext.input_length = input_length;
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newcontext.mode = <%= @lexer.mode_id("default") %>;
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/* Copy to the user's context structure. */
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*context = newcontext;
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}
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/**************************************************************************
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* Decoder
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*************************************************************************/
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/**
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* Decode a UTF-8 code point.
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*
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* @param input
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* Text input to decode.
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* @param input_length
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* Input text length.
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* @param[out] out_code_point
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* The decoded code point is stored here if the return value is P_SUCCESS.
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* @param[out] out_code_point_length
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* The number of bytes the code point used is stored here if the return value
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* is P_SUCCESS.
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*
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* @retval P_SUCCESS on a successful code point decode
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* @retval P_DECODE_ERROR when an encoding error is observed
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* @retval P_EOF when the end of the text input is reached
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*/
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size_t <%= @grammar.prefix %>decode_code_point(uint8_t const * input, size_t input_length,
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<%= @grammar.prefix %>code_point_t * out_code_point, uint8_t * out_code_point_length)
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{
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if (input_length == 0u)
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{
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return P_EOF;
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}
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char c = input[0];
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<%= @grammar.prefix %>code_point_t code_point;
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uint8_t code_point_length;
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if ((c & 0x80u) == 0u)
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{
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code_point = c;
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code_point_length = 1u;
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}
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else
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{
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uint8_t following_bytes;
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if ((c & 0xE0u) == 0xC0u)
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{
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code_point = c & 0x1Fu;
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following_bytes = 1u;
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}
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else if ((c & 0xF0u) == 0xE0u)
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{
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code_point = c & 0x0Fu;
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following_bytes = 2u;
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}
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else if ((c & 0xF8u) == 0xF0u)
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{
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code_point = c & 0x07u;
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following_bytes = 3u;
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}
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else if ((c & 0xFCu) == 0xF8u)
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{
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code_point = c & 0x03u;
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following_bytes = 4u;
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}
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else if ((c & 0xFEu) == 0xFCu)
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{
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code_point = c & 0x01u;
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following_bytes = 5u;
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}
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else
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{
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return P_DECODE_ERROR;
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}
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if (input_length <= following_bytes)
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{
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return P_DECODE_ERROR;
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}
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code_point_length = (uint8_t)(following_bytes + 1u);
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for (size_t i = 0u; i < following_bytes; i++)
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{
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char b = input[i + 1u];
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if ((b & 0xC0u) != 0x80u)
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{
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return P_DECODE_ERROR;
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}
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code_point = (code_point << 6u) | (b & 0x3Fu);
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}
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}
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*out_code_point = code_point;
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*out_code_point_length = code_point_length;
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return P_SUCCESS;
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}
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/**************************************************************************
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* Lexer
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*************************************************************************/
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/** Lexer state ID type. */
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typedef <%= get_type_for(@lexer.state_table.size) %> lexer_state_id_t;
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/** Invalid lexer state ID. */
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#define INVALID_LEXER_STATE_ID <%= @lexer.state_table.size %>u
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/** Lexer user code ID type. */
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<% user_code_id_count = (@grammar.patterns.map(&:code_id).compact.max || 0) + 1 %>
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typedef <%= get_type_for(user_code_id_count) %> lexer_user_code_id_t;
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/** Invalid lexer user code ID. */
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#define INVALID_USER_CODE_ID <%= user_code_id_count %>u
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/**
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* Lexer transition table entry.
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*
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* An incoming code point matching the range for a transition entry will cause
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* the lexer to progress to the destination state.
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*/
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typedef struct
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{
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/** First code point in the range for this transition. */
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<%= @grammar.prefix %>code_point_t first;
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/** Last code point in the range for this transition. */
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<%= @grammar.prefix %>code_point_t last;
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/** Destination lexer state ID for this transition. */
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lexer_state_id_t destination_state;
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} lexer_transition_t;
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/** Lexer state table entry. */
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typedef struct
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{
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/** Index to the transition table for this state. */
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<%= get_type_for(@lexer.transition_table.size - 1) %> transition_table_index;
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/** Number of transition table entries for this state. */
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<%= get_type_for(@lexer.state_table.map {|ste| ste[:n_transitions]}.max) %> n_transitions;
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/** Lexer token formed at this state. */
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<%= @grammar.prefix %>token_t token;
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/** Lexer user code ID to execute at this state. */
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lexer_user_code_id_t code_id;
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/** Whether this state matches a lexer pattern. */
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bool accepts;
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} lexer_state_t;
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/** Lexer mode table entry. */
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typedef struct
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{
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/** Offset in the state table to be used for this mode. */
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uint32_t state_table_offset;
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} lexer_mode_t;
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/**
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* Lexer match info structure.
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*
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* This structure holds output values from the lexer upon a successful pattern
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* match.
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*/
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typedef struct
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{
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/** Number of bytes of input text used to match. */
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size_t length;
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/** Input text position delta. */
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<%= @grammar.prefix %>position_t delta_position;
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/** Accepting lexer state from the match. */
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lexer_state_t const * accepting_state;
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} lexer_match_info_t;
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/** Lexer transition table. */
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static lexer_transition_t lexer_transition_table[] = {
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<% @lexer.transition_table.each do |transition_table_entry| %>
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{<%= transition_table_entry[:first] %>u, <%= transition_table_entry[:last] %>u, <%= transition_table_entry[:destination] %>u},
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<% end %>
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};
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/** Lexer state table. */
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static lexer_state_t lexer_state_table[] = {
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<% @lexer.state_table.each do |state_table_entry| %>
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{<%= state_table_entry[:transition_table_index] %>u, <%= state_table_entry[:n_transitions] %>u, <%= state_table_entry[:token] || "INVALID_TOKEN_ID" %>, <%= state_table_entry[:code_id] || "INVALID_USER_CODE_ID" %>, <%= state_table_entry[:accepts] %>},
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<% end %>
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};
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/** Lexer mode table. */
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static lexer_mode_t lexer_mode_table[] = {
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<% @lexer.mode_table.each do |mode_table_entry| %>
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{<%= mode_table_entry[:state_table_offset] %>},
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<% end %>
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};
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/**
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* Execute user code associated with a lexer pattern.
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*
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* @param context
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* Lexer/parser context structure.
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* @param code_id
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* The ID of the user code block to execute.
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* @param match
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* Matched text for this pattern.
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* @param match_length
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* Matched text length.
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* @param out_token_info
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* Lexer token info in progress.
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*
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* @return Token to accept, or invalid token if the user code does
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* not explicitly return a token.
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*/
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static <%= @grammar.prefix %>token_t lexer_user_code(<%= @grammar.prefix %>context_t * context,
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lexer_user_code_id_t code_id, uint8_t const * match,
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size_t match_length, <%= @grammar.prefix %>token_info_t * out_token_info)
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{
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switch (code_id)
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{
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<% @grammar.patterns.each do |pattern| %>
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<% if pattern.code_id %>
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case <%= pattern.code_id %>u: {
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<%= expand_code(pattern.code, false, nil, pattern) %>
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} break;
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<% end %>
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<% end %>
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default: break;
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}
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return INVALID_TOKEN_ID;
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}
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/**
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* Check if there is a transition from the current lexer state to another
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* based on the given input code point.
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*
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* @param current_state
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* Current lexer state.
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* @param code_point
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* Input code point.
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*
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* @return Lexer state to transition to, or INVALID_LEXER_STATE_ID if none.
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*/
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static lexer_state_id_t check_lexer_transition(uint32_t current_state, uint32_t code_point)
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{
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uint32_t transition_table_index = lexer_state_table[current_state].transition_table_index;
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for (uint32_t i = 0u; i < lexer_state_table[current_state].n_transitions; i++)
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{
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if ((lexer_transition_table[transition_table_index + i].first <= code_point) &&
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(code_point <= lexer_transition_table[transition_table_index + i].last))
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{
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return lexer_transition_table[transition_table_index + i].destination_state;
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}
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}
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return INVALID_LEXER_STATE_ID;
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}
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/**
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* Find the longest lexer pattern match at the current position.
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*
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* @param context
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* Lexer/parser context structure.
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* @param[out] out_token_info
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* The lexed token information is stored here if the return value is
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* P_SUCCESS.
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*
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* @reval P_SUCCESS
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* A token was successfully lexed.
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* @reval P_DECODE_ERROR
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* The decoder encountered invalid text encoding.
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* @reval P_UNEXPECTED_INPUT
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* Input text does not match any lexer pattern.
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* @retval P_EOF
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* The end of the text input was reached.
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*/
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static size_t find_longest_match(<%= @grammar.prefix %>context_t * context,
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lexer_match_info_t * out_match_info, size_t * out_unexpected_input_length)
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{
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lexer_match_info_t longest_match;
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lexer_match_info_t attempt_match;
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*out_match_info = longest_match;
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uint32_t current_state = lexer_mode_table[context.mode].state_table_offset;
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for (;;)
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{
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size_t const input_index = context.input_index + attempt_match.length;
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uint8_t const * input = &context.input[input_index];
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size_t input_length = context.input_length - input_index;
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<%= @grammar.prefix %>code_point_t code_point;
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uint8_t code_point_length;
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size_t result = <%= @grammar.prefix %>decode_code_point(input, input_length, &code_point, &code_point_length);
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switch (result)
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{
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case P_SUCCESS:
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lexer_state_id_t transition_state = check_lexer_transition(current_state, code_point);
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if (transition_state != INVALID_LEXER_STATE_ID)
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{
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attempt_match.length += code_point_length;
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if (code_point == '\n')
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{
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attempt_match.delta_position.row++;
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attempt_match.delta_position.col = 0u;
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}
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else
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{
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attempt_match.delta_position.col++;
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}
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current_state = transition_state;
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if (lexer_state_table[current_state].accepts)
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{
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attempt_match.accepting_state = &lexer_state_table[current_state];
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longest_match = attempt_match;
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}
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}
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else if (longest_match.length > 0)
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{
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*out_match_info = longest_match;
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return P_SUCCESS;
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}
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else
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{
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*out_unexpected_input_length = attempt_match.length + code_point_length;
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return P_UNEXPECTED_INPUT;
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}
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break;
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case P_EOF:
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/* We hit EOF. */
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if (longest_match.length > 0)
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{
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/* We have a match, so use it. */
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*out_match_info = longest_match;
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return P_SUCCESS;
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}
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else if (attempt_match.length != 0)
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{
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/* There is a partial match - error! */
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*out_unexpected_input_length = attempt_match.length;
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return P_UNEXPECTED_INPUT;
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}
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else
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{
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/* Valid EOF return. */
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return P_EOF;
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}
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break;
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case P_DECODE_ERROR:
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/* If we see a decode error, we may be partially in the middle of
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* matching a pattern, so return the attempted match info so that
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* the input text position can be updated. */
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*out_match_info = attempt_match;
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return result;
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default:
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return result;
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}
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}
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}
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/**
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* Attempt to lex the next token in the input stream.
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*
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* @param context
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* Lexer/parser context structure.
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* @param[out] out_token_info
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* The lexed token information is stored here if the return value is
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* P_SUCCESS.
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*
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* @reval P_SUCCESS
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* A token was successfully lexed.
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* @reval P_DECODE_ERROR
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* The decoder encountered invalid text encoding.
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* @reval P_UNEXPECTED_INPUT
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* Input text does not match any lexer pattern.
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* @retval P_DROP
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* A drop pattern was matched so the lexer should continue.
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*/
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static size_t attempt_lex_token(<%= @grammar.prefix %>context_t * context, <%= @grammar.prefix %>token_info_t * out_token_info)
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{
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<%= @grammar.prefix %>token_info_t token_info;
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token_info.position = context.text_position;
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token_info.token = INVALID_TOKEN_ID;
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*out_token_info = token_info; // TODO: remove
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lexer_match_info_t match_info;
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size_t unexpected_input_length;
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size_t result = find_longest_match(context, &match_info, &unexpected_input_length);
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switch (result)
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{
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case P_SUCCESS:
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<%= @grammar.prefix %>token_t token_to_accept = match_info.accepting_state.token;
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if (match_info.accepting_state.code_id != INVALID_USER_CODE_ID)
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{
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uint8_t const * match = &context.input[context.input_index];
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<%= @grammar.prefix %>token_t user_code_token = lexer_user_code(context,
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match_info.accepting_state.code_id, match, match_info.length, &token_info);
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/* An invalid token returned from lexer_user_code() means that the
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* user code did not explicitly return a token. So only override
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* the token to return if the user code does explicitly return a
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* token. */
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if (user_code_token != INVALID_TOKEN_ID)
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{
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token_to_accept = user_code_token;
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}
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}
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/* Update the input position tracking. */
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context.input_index += match_info.length;
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context.text_position.row += match_info.delta_position.row;
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if (match_info.delta_position.row != 0u)
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{
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context.text_position.col = match_info.delta_position.col;
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}
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else
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{
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context.text_position.col += match_info.delta_position.col;
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}
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if (token_to_accept == INVALID_TOKEN_ID)
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{
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return P_DROP;
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}
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token_info.token = token_to_accept;
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token_info.length = match_info.length;
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*out_token_info = token_info;
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return P_SUCCESS;
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case P_EOF:
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token_info.token = TOKEN___EOF;
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*out_token_info = token_info;
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return P_SUCCESS;
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case P_DECODE_ERROR:
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/* Update the input position tracking. */
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context.input_index += match_info.length;
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context.text_position.row += match_info.delta_position.row;
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if (match_info.delta_position.row != 0u)
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{
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context.text_position.col = match_info.delta_position.col;
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}
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else
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{
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context.text_position.col += match_info.delta_position.col;
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}
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return result;
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default:
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return result;
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}
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}
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/**
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* Lex the next token in the input stream.
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*
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* @param context
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* Lexer/parser context structure.
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* @param[out] out_token_info
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* The lexed token information is stored here if the return value is
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* P_SUCCESS.
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*
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* @reval P_SUCCESS
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* A token was successfully lexed.
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* @reval P_DECODE_ERROR
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* The decoder encountered invalid text encoding.
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* @reval P_UNEXPECTED_INPUT
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* Input text does not match any lexer pattern.
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*/
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size_t <%= @grammar.prefix %>lex(<%= @grammar.prefix %>context_t * context, <%= @grammar.prefix %>token_info_t * out_token_info)
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{
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|
for (;;)
|
|
{
|
|
size_t result = attempt_lex_token(context, out_token_info);
|
|
if (result != P_DROP)
|
|
{
|
|
return result;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**************************************************************************
|
|
* Parser
|
|
*************************************************************************/
|
|
|
|
/** Reduce ID type. */
|
|
alias reduce_id_t = <%= get_type_for(@parser.reduce_table.size) %>;
|
|
|
|
/**
|
|
* A symbol ID can hold either a token ID or a rule set ID.
|
|
*
|
|
* Token IDs and rule set IDs share the same namespace, with rule set IDs
|
|
* beginning after token IDs end.
|
|
*/
|
|
alias symbol_id_t = <%= get_type_for(@parser.rule_sets.map(&:last).map(&:id).max) %>;
|
|
|
|
/** Parser state ID type. */
|
|
alias parser_state_id_t = <%= get_type_for(@parser.state_table.size) %>;
|
|
|
|
/** Parser rule ID type. */
|
|
alias rule_id_t = <%= get_type_for(@grammar.rules.size) %>;
|
|
|
|
/** Parser shift ID type. */
|
|
alias shift_id_t = <%= get_type_for(@parser.shift_table.size) %>;
|
|
|
|
/** Shift table entry. */
|
|
typedef struct
|
|
{
|
|
/** Token or rule set ID. */
|
|
symbol_id_t symbol_id;
|
|
|
|
/** Parser state to shift to. */
|
|
parser_state_id_t state_id;
|
|
} shift_t;
|
|
|
|
/** Reduce table entry. */
|
|
typedef struct
|
|
{
|
|
/** Lookahead token. */
|
|
<%= @grammar.prefix %>token_t token;
|
|
|
|
/**
|
|
* Rule ID.
|
|
*
|
|
* This is used to execute the parser user code block associated with a
|
|
* grammar rule.
|
|
*/
|
|
rule_id_t rule;
|
|
|
|
/**
|
|
* Rule set ID.
|
|
*
|
|
* This is used as the new top symbol ID of the parse stack after this
|
|
* reduce action.
|
|
*/
|
|
symbol_id_t rule_set;
|
|
|
|
/**
|
|
* Number of states leading to this reduce action.
|
|
*
|
|
* This is the number of entries popped from the parse stack after this
|
|
* reduce action.
|
|
*/
|
|
parser_state_id_t n_states;
|
|
} reduce_t;
|
|
|
|
/** Parser state entry. */
|
|
typedef struct
|
|
{
|
|
/** First shift table entry for this parser state. */
|
|
shift_id_t shift_table_index;
|
|
|
|
/** Number of shift table entries for this parser state. */
|
|
shift_id_t n_shift_entries;
|
|
|
|
/** First reduce table entry for this parser state. */
|
|
reduce_id_t reduce_table_index;
|
|
|
|
/** Number of reduce table entries for this parser state. */
|
|
reduce_id_t n_reduce_entries;
|
|
} parser_state_t;
|
|
|
|
/**
|
|
* Structure to hold a state ID and value pair.
|
|
*
|
|
* A stack of these structures makes up the parse stack.
|
|
*/
|
|
typedef struct
|
|
{
|
|
/** Parser state ID. */
|
|
size_t state_id;
|
|
|
|
/** Parser value from this state. */
|
|
<%= @grammar.prefix %>value_t pvalue;
|
|
} state_value_t;
|
|
|
|
/** Parser shift table. */
|
|
static immutable shift_t[] parser_shift_table = [
|
|
<% @parser.shift_table.each do |shift| %>
|
|
shift_t(<%= shift[:symbol_id] %>u, <%= shift[:state_id] %>u),
|
|
<% end %>
|
|
];
|
|
|
|
/** Parser reduce table. */
|
|
static immutable reduce_t[] parser_reduce_table = [
|
|
<% @parser.reduce_table.each do |reduce| %>
|
|
reduce_t(<%= reduce[:token_id] %>u, <%= reduce[:rule_id] %>u, <%= reduce[:rule_set_id] %>u, <%= reduce[:n_states] %>u),
|
|
<% end %>
|
|
];
|
|
|
|
/** Parser state table. */
|
|
static immutable parser_state_t[] parser_state_table = [
|
|
<% @parser.state_table.each do |state| %>
|
|
parser_state_t(<%= state[:shift_index] %>u, <%= state[:n_shifts] %>u, <%= state[:reduce_index] %>u, <%= state[:n_reduces] %>u),
|
|
<% end %>
|
|
];
|
|
|
|
/* state_values linked list functionality */
|
|
|
|
typedef struct state_values_list_entry_s
|
|
{
|
|
/** State value object. */
|
|
state_value_t state_value;
|
|
|
|
/** Linked list previous entry. */
|
|
struct state_values_list_entry_s * prev;
|
|
|
|
/** Linked list next entry. */
|
|
struct state_values_list_entry_s * next;
|
|
} state_values_list_entry_t;
|
|
|
|
typedef struct
|
|
{
|
|
size_t length;
|
|
state_values_list_entry_t * first;
|
|
state_values_list_entry_t * last;
|
|
} state_values_list_t;
|
|
/**
|
|
* Execute user code associated with a parser rule.
|
|
*
|
|
* @param rule The ID of the rule.
|
|
*
|
|
* @return Parse value.
|
|
*/
|
|
static <%= @grammar.prefix %>value_t parser_user_code(uint32_t rule, state_value_t[] statevalues, uint32_t n_states)
|
|
{
|
|
<%= @grammar.prefix %>value_t _pvalue;
|
|
|
|
switch (rule)
|
|
{
|
|
<% @grammar.rules.each do |rule| %>
|
|
<% if rule.code %>
|
|
case <%= rule.id %>u: {
|
|
<%= expand_code(rule.code, true, rule, nil) %>
|
|
} break;
|
|
<% end %>
|
|
<% end %>
|
|
default: break;
|
|
}
|
|
|
|
return _pvalue;
|
|
}
|
|
|
|
/**
|
|
* Check if the parser should shift to a new state.
|
|
*
|
|
* @param state_id
|
|
* Parser state ID.
|
|
* @param symbol_id
|
|
* Incoming token/rule set ID.
|
|
*
|
|
* @return State to shift to, or INVALID_ID if none.
|
|
*/
|
|
static size_t check_shift(size_t state_id, size_t symbol_id)
|
|
{
|
|
uint32_t start = parser_state_table[state_id].shift_table_index;
|
|
uint32_t end = start + parser_state_table[state_id].n_shift_entries;
|
|
for (uint32_t i = start; i < end; i++)
|
|
{
|
|
if (parser_shift_table[i].symbol_id == symbol_id)
|
|
{
|
|
return parser_shift_table[i].state_id;
|
|
}
|
|
}
|
|
return INVALID_ID;
|
|
}
|
|
|
|
/**
|
|
* Check if the parser should reduce to a new state.
|
|
*
|
|
* @param state_id
|
|
* Parser state ID.
|
|
* @param token
|
|
* Incoming token.
|
|
*
|
|
* @return State to reduce to, or INVALID_ID if none.
|
|
*/
|
|
static size_t check_reduce(size_t state_id, <%= @grammar.prefix %>token_t token)
|
|
{
|
|
size_t start = parser_state_table[state_id].reduce_table_index;
|
|
size_t end = start + parser_state_table[state_id].n_reduce_entries;
|
|
for (size_t i = start; i < end; i++)
|
|
{
|
|
if ((parser_reduce_table[i].token == token) ||
|
|
(parser_reduce_table[i].token == INVALID_TOKEN_ID))
|
|
{
|
|
return i;
|
|
}
|
|
}
|
|
return INVALID_ID;
|
|
}
|
|
|
|
/**
|
|
* Run the parser.
|
|
*
|
|
* @param context
|
|
* Lexer/parser context structure.
|
|
*
|
|
* @retval P_SUCCESS
|
|
* The parser successfully matched the input text. The parse result value
|
|
* can be accessed with <%= @grammar.prefix %>result().
|
|
* @retval P_UNEXPECTED_TOKEN
|
|
* An unexpected token was encountered that does not match any grammar rule.
|
|
* The value context.token holds the unexpected token.
|
|
* @reval P_DECODE_ERROR
|
|
* The decoder encountered invalid text encoding.
|
|
* @reval P_UNEXPECTED_INPUT
|
|
* Input text does not match any lexer pattern.
|
|
*/
|
|
size_t <%= @grammar.prefix %>parse(<%= @grammar.prefix %>context_t * context)
|
|
{
|
|
<%= @grammar.prefix %>token_info_t token_info;
|
|
<%= @grammar.prefix %>token_t token = INVALID_TOKEN_ID;
|
|
state_value_t[] statevalues = new state_value_t[](1);
|
|
size_t reduced_rule_set = INVALID_ID;
|
|
<%= @grammar.prefix %>value_t reduced_parser_value;
|
|
for (;;)
|
|
{
|
|
if (token == INVALID_TOKEN_ID)
|
|
{
|
|
size_t lexer_result = <%= @grammar.prefix %>lex(context, &token_info);
|
|
if (lexer_result != P_SUCCESS)
|
|
{
|
|
return lexer_result;
|
|
}
|
|
token = token_info.token;
|
|
}
|
|
size_t shift_state = INVALID_ID;
|
|
if (reduced_rule_set != INVALID_ID)
|
|
{
|
|
shift_state = check_shift(statevalues[$-1].state_id, reduced_rule_set);
|
|
}
|
|
if (shift_state == INVALID_ID)
|
|
{
|
|
shift_state = check_shift(statevalues[$-1].state_id, token);
|
|
if ((shift_state != INVALID_ID) && (token == TOKEN___EOF))
|
|
{
|
|
/* Successful parse. */
|
|
context.parse_result = statevalues[$-1].pvalue;
|
|
return P_SUCCESS;
|
|
}
|
|
}
|
|
if (shift_state != INVALID_ID)
|
|
{
|
|
/* We have something to shift. */
|
|
statevalues ~= state_value_t(shift_state);
|
|
if (reduced_rule_set == INVALID_ID)
|
|
{
|
|
/* We shifted a token, mark it consumed. */
|
|
token = INVALID_TOKEN_ID;
|
|
statevalues[$-1].pvalue = token_info.pvalue;
|
|
}
|
|
else
|
|
{
|
|
/* We shifted a RuleSet. */
|
|
statevalues[$-1].pvalue = reduced_parser_value;
|
|
<%= @grammar.prefix %>value_t new_parse_result;
|
|
reduced_parser_value = new_parse_result;
|
|
reduced_rule_set = INVALID_ID;
|
|
}
|
|
continue;
|
|
}
|
|
|
|
size_t reduce_index = check_reduce(statevalues[$-1].state_id, token);
|
|
if (reduce_index != INVALID_ID)
|
|
{
|
|
/* We have something to reduce. */
|
|
reduced_parser_value = parser_user_code(parser_reduce_table[reduce_index].rule, statevalues, parser_reduce_table[reduce_index].n_states);
|
|
reduced_rule_set = parser_reduce_table[reduce_index].rule_set;
|
|
statevalues.length -= parser_reduce_table[reduce_index].n_states;
|
|
continue;
|
|
}
|
|
|
|
/* A token was successfully lexed, so the input text position was
|
|
* advanced. However, this is an unexpected token, so we want to reset
|
|
* the context text position to point to the token rather than the text
|
|
* after it, so that if the caller wants to report the error position,
|
|
* it will point to the correct position of the unexpected token. */
|
|
context.text_position = token_info.position;
|
|
context.token = token;
|
|
return P_UNEXPECTED_TOKEN;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Get the parse result value.
|
|
*
|
|
* @param context
|
|
* Lexer/parser context structure.
|
|
*
|
|
* @return Parse result value.
|
|
*/
|
|
<%= start_rule_type[1] %> <%= @grammar.prefix %>result(<%= @grammar.prefix %>context_t * context)
|
|
{
|
|
return context.parse_result.v_<%= start_rule_type[0] %>;
|
|
}
|
|
|
|
/**
|
|
* Get the current text input position.
|
|
*
|
|
* @param context
|
|
* Lexer/parser context structure.
|
|
*
|
|
* @return Current text position.
|
|
*/
|
|
<%= @grammar.prefix %>position_t <%= @grammar.prefix %>position(<%= @grammar.prefix %>context_t * context)
|
|
{
|
|
return context.text_position;
|
|
}
|