bshell/bshell.runtime/parse/lex/hashtable.c

#include "lex-internal.h"

static enum bshell_status hashtable_hyphen(struct bshell_lex_ctx *ctx)
{
	fx_wchar c = peek_char(ctx);
	if (!fx_wchar_is_alnum(c)) {
		push_symbol(ctx, BSHELL_SYM_HYPHEN);
		handle_lex_state_transition(ctx, BSHELL_SYM_HYPHEN);
		return BSHELL_SUCCESS;
	}

	struct bshell_lex_token *tok = NULL;
	enum bshell_status status = read_word(
		ctx,
		READ_NO_SET_TOKEN_START | READ_APPEND_HYPHEN,
		&tok);
	if (status != BSHELL_SUCCESS) {
		return status;
	}

	unsigned int token_type = BSHELL_TOK_WORD;
	if (convert_word_to_number(tok)) {
		token_type = tok->tok_type;
		/* because of APPEND_HYPHEN (which is needed to ensure operator
		 * tokens are detected properly), the resulting number will be
		 * negative.
		 * this token will be preceded by a HYPHEN token, so the number
		 * must be positive */
		fx_value neg = FX_INT(-1);
		fx_value_multiply(&tok->tok_number, &neg, &tok->tok_number);
		push_symbol(ctx, BSHELL_SYM_HYPHEN);
	} else if (convert_word_to_operator(ctx, tok)) {
		token_type = tok->tok_operator;
	}

	handle_lex_state_transition(ctx, token_type);
	enqueue_token(ctx, tok);
	return BSHELL_SUCCESS;
}

static enum bshell_status hashtable_symbol(struct bshell_lex_ctx *ctx)
{
	const struct bshell_lex_token_definition *sym = NULL;
	enum bshell_status status = read_symbol(ctx, &sym);

	if (status != BSHELL_SUCCESS) {
		return status;
	}

	handle_lex_state_transition(ctx, sym->id);

	struct bshell_lex_token *tok = NULL;
	switch (sym->id) {
	case BSHELL_SYM_SQUOTE:
		status = read_literal_string(ctx, &tok);
		if (status != BSHELL_SUCCESS) {
			return status;
		}
		enqueue_token(ctx, tok);
		return BSHELL_SUCCESS;
	case BSHELL_SYM_HYPHEN:
		return hashtable_hyphen(ctx);
	case BSHELL_SYM_HASH:
		return read_line_comment(ctx);
	case BSHELL_SYM_DOLLAR:
		status = read_var(ctx, BSHELL_TOK_VAR, &tok);
		if (status != BSHELL_SUCCESS) {
			return status;
		}

		enqueue_token(ctx, tok);
		return status;
	case BSHELL_SYM_AT:
		status = read_var(ctx, BSHELL_TOK_VAR_SPLAT, &tok);
		if (status != BSHELL_SUCCESS) {
			return status;
		}

		enqueue_token(ctx, tok);
		return status;
	case BSHELL_SYM_DOLLAR_LEFT_BRACE:
		status = read_braced_var(ctx, BSHELL_TOK_VAR, &tok);
		if (status != BSHELL_SUCCESS) {
			return status;
		}

		enqueue_token(ctx, tok);
		return status;
	default:
		break;
	}

	push_symbol(ctx, sym->id);

	return BSHELL_SUCCESS;
}

static enum bshell_status hashtable_word(struct bshell_lex_ctx *ctx)
{
	struct bshell_lex_token *word = NULL;
	enum bshell_status status = read_word(ctx, 0, &word);
	if (status != BSHELL_SUCCESS) {
		return status;
	}

	convert_word_to_number(word);

	handle_lex_state_transition(ctx, word->tok_type);
	enqueue_token(ctx, word);
	return BSHELL_SUCCESS;
}

static enum bshell_status hashtable_pump_token(struct bshell_lex_ctx *ctx)
{
	fx_wchar c = peek_char(ctx);
	bool newline = false;

	set_token_start(ctx);
	while (fx_wchar_is_space(c)) {
		if (c == '\n') {
			newline = true;
		}

		set_token_end(ctx);
		advance_char_noread(ctx);
		c = peek_char_noread(ctx);
	}

#if 1
	if (newline) {
		struct bshell_lex_token *tok = bshell_lex_token_create(BSHELL_TOK_LINEFEED);
		enqueue_token(ctx, tok);
		return BSHELL_SUCCESS;
	}
#endif

	if (char_can_begin_symbol(ctx, c)) {
		return hashtable_symbol(ctx);
	}

	return hashtable_word(ctx);
}

static const struct bshell_lex_state_link links[] = {
	LINK_PUSH_WITH_TERM(
		BSHELL_SYM_EQUAL,
		BSHELL_LEX_STATE_STATEMENT,
		0,
		BSHELL_SYM_RIGHT_BRACE,
		BSHELL_SYM_SEMICOLON,
		BSHELL_TOK_LINEFEED),
	LINK_PUSH_WITH_TERM(
		BSHELL_TOK_LINEFEED,
		BSHELL_LEX_STATE_STATEMENT,
		0,
		BSHELL_SYM_SEMICOLON,
		BSHELL_TOK_LINEFEED),
	LINK_PUSH(BSHELL_SYM_DQUOTE, BSHELL_LEX_STATE_STRING, 0),
	LINK_PUSH(
		BSHELL_SYM_LEFT_PAREN,
		BSHELL_LEX_STATE_STATEMENT,
		STATEMENT_F_DISABLE_KEYWORDS),
	LINK_PUSH(BSHELL_SYM_DOLLAR_LEFT_PAREN, BSHELL_LEX_STATE_STATEMENT, 0),
	LINK_POP2(BSHELL_SYM_RIGHT_BRACE, LINK_ALLOW_RECURSION),
	LINK_END,
};

static const unsigned int symbols[] = {
	BSHELL_SYM_EQUAL,
	BSHELL_SYM_DQUOTE,
	BSHELL_SYM_SQUOTE,
	BSHELL_SYM_SEMICOLON,
	BSHELL_SYM_RIGHT_BRACE,
	BSHELL_SYM_DOLLAR_LEFT_PAREN,
	BSHELL_SYM_LEFT_PAREN,
	BSHELL_SYM_HASH,
	BSHELL_SYM_NONE,
};

const struct bshell_lex_state_type lex_hashtable_state = {
	.s_id = BSHELL_LEX_STATE_HASHTABLE,
	.s_pump_token = hashtable_pump_token,
	.s_links = links,
	.s_symbols = symbols,
};