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Code tidy: replace if with case statement in QPDFTokenizer::presentCharacter
This commit is contained in:
m-holger
parent
cf945eeabf
commit
91fb61eda5
@ -198,12 +198,6 @@ QPDFTokenizer::resolveLiteral()
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void
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QPDFTokenizer::presentCharacter(char ch)
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{
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if (this->state == st_token_ready) {
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throw std::logic_error(
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"INTERNAL ERROR: QPDF tokenizer presented character "
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"while token is waiting");
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}
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char orig_ch = ch;
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// State machine is implemented such that some characters may be
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@ -211,7 +205,14 @@ QPDFTokenizer::presentCharacter(char ch)
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// the character that caused a state change in the new state.
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bool handled = true;
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if (this->state == st_top) {
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switch (this->state) {
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case (st_token_ready):
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throw std::logic_error(
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"INTERNAL ERROR: QPDF tokenizer presented character "
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"while token is waiting");
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case (st_top):
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// Note: we specifically do not use ctype here. It is
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// locale-dependent.
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if (isSpace(ch)) {
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@ -258,7 +259,9 @@ QPDFTokenizer::presentCharacter(char ch)
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this->state = st_literal;
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}
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}
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} else if (this->state == st_in_space) {
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break;
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case st_in_space:
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// We only enter this state if include_ignorable is true.
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if (!isSpace(ch)) {
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this->type = tt_space;
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@ -268,7 +271,9 @@ QPDFTokenizer::presentCharacter(char ch)
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} else {
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this->val += ch;
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}
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} else if (this->state == st_in_comment) {
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break;
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case st_in_comment:
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if ((ch == '\r') || (ch == '\n')) {
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if (this->include_ignorable) {
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this->type = tt_comment;
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@ -281,7 +286,9 @@ QPDFTokenizer::presentCharacter(char ch)
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} else if (this->include_ignorable) {
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this->val += ch;
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}
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} else if (this->state == st_lt) {
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break;
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case st_lt:
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if (ch == '<') {
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this->val += "<<";
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this->type = tt_dict_open;
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@ -290,7 +297,9 @@ QPDFTokenizer::presentCharacter(char ch)
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handled = false;
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this->state = st_in_hexstring;
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}
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} else if (this->state == st_gt) {
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break;
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case st_gt:
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if (ch == '>') {
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this->val += ">>";
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this->type = tt_dict_close;
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@ -304,91 +313,99 @@ QPDFTokenizer::presentCharacter(char ch)
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this->char_to_unread = ch;
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this->state = st_token_ready;
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}
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} else if (this->state == st_in_string) {
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if (this->string_ignoring_newline && (ch != '\n')) {
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this->string_ignoring_newline = false;
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}
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break;
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size_t bs_num_count = strlen(this->bs_num_register);
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bool ch_is_octal = ((ch >= '0') && (ch <= '7'));
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if ((bs_num_count == 3) || ((bs_num_count > 0) && (!ch_is_octal))) {
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// We've accumulated \ddd. PDF Spec says to ignore
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// high-order overflow.
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this->val +=
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static_cast<char>(strtol(this->bs_num_register, nullptr, 8));
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memset(this->bs_num_register, '\0', sizeof(this->bs_num_register));
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bs_num_count = 0;
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}
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case st_in_string:
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{
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if (this->string_ignoring_newline && (ch != '\n')) {
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this->string_ignoring_newline = false;
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}
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if (this->string_ignoring_newline && (ch == '\n')) {
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// ignore
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this->string_ignoring_newline = false;
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} else if (
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ch_is_octal && (this->last_char_was_bs || (bs_num_count > 0))) {
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this->bs_num_register[bs_num_count++] = ch;
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} else if (this->last_char_was_bs) {
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switch (ch) {
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case 'n':
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size_t bs_num_count = strlen(this->bs_num_register);
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bool ch_is_octal = ((ch >= '0') && (ch <= '7'));
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if ((bs_num_count == 3) || ((bs_num_count > 0) && (!ch_is_octal))) {
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// We've accumulated \ddd. PDF Spec says to ignore
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// high-order overflow.
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this->val += static_cast<char>(
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strtol(this->bs_num_register, nullptr, 8));
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memset(
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this->bs_num_register, '\0', sizeof(this->bs_num_register));
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bs_num_count = 0;
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}
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if (this->string_ignoring_newline && (ch == '\n')) {
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// ignore
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this->string_ignoring_newline = false;
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} else if (
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ch_is_octal && (this->last_char_was_bs || (bs_num_count > 0))) {
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this->bs_num_register[bs_num_count++] = ch;
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} else if (this->last_char_was_bs) {
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switch (ch) {
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case 'n':
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this->val += '\n';
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break;
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case 'r':
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this->val += '\r';
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break;
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case 't':
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this->val += '\t';
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break;
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case 'b':
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this->val += '\b';
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break;
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case 'f':
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this->val += '\f';
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break;
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case '\n':
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break;
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case '\r':
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this->string_ignoring_newline = true;
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break;
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default:
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// PDF spec says backslash is ignored before anything else
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this->val += ch;
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break;
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}
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} else if (ch == '\\') {
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// last_char_was_bs is set/cleared below as appropriate
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if (bs_num_count) {
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throw std::logic_error(
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"INTERNAL ERROR: QPDFTokenizer: bs_num_count != 0 "
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"when ch == '\\'");
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}
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} else if (ch == '(') {
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this->val += ch;
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++this->string_depth;
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} else if ((ch == ')') && (--this->string_depth == 0)) {
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this->type = tt_string;
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this->state = st_token_ready;
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} else if (ch == '\r') {
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// CR by itself is converted to LF
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this->val += '\n';
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break;
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case 'r':
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this->val += '\r';
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break;
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case 't':
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this->val += '\t';
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break;
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case 'b':
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this->val += '\b';
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break;
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case 'f':
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this->val += '\f';
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break;
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case '\n':
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break;
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case '\r':
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this->string_ignoring_newline = true;
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break;
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default:
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// PDF spec says backslash is ignored before anything else
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this->val += ch;
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break;
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}
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} else if (ch == '\\') {
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// last_char_was_bs is set/cleared below as appropriate
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if (bs_num_count) {
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throw std::logic_error(
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"INTERNAL ERROR: QPDFTokenizer: bs_num_count != 0 "
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"when ch == '\\'");
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}
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} else if (ch == '(') {
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this->val += ch;
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++this->string_depth;
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} else if ((ch == ')') && (--this->string_depth == 0)) {
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this->type = tt_string;
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this->state = st_token_ready;
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} else if (ch == '\r') {
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// CR by itself is converted to LF
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this->val += '\n';
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} else if (ch == '\n') {
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// CR LF is converted to LF
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if (!this->last_char_was_cr) {
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} else if (ch == '\n') {
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// CR LF is converted to LF
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if (!this->last_char_was_cr) {
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this->val += ch;
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}
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} else {
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this->val += ch;
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}
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} else {
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this->val += ch;
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this->last_char_was_cr =
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((!this->string_ignoring_newline) && (ch == '\r'));
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this->last_char_was_bs =
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((!this->last_char_was_bs) && (ch == '\\'));
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}
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break;
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this->last_char_was_cr =
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((!this->string_ignoring_newline) && (ch == '\r'));
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this->last_char_was_bs = ((!this->last_char_was_bs) && (ch == '\\'));
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} else if (this->state == st_literal) {
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case st_literal:
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if (isDelimiter(ch)) {
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// A C-locale whitespace character or delimiter terminates
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// token. It is important to unread the whitespace
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@ -405,16 +422,19 @@ QPDFTokenizer::presentCharacter(char ch)
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} else {
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this->val += ch;
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}
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} else if (this->state == st_inline_image) {
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break;
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case st_inline_image:
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this->val += ch;
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size_t len = this->val.length();
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if (len == this->inline_image_bytes) {
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if (this->val.length() == this->inline_image_bytes) {
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QTC::TC("qpdf", "QPDFTokenizer found EI by byte count");
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this->type = tt_inline_image;
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this->inline_image_bytes = 0;
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this->state = st_token_ready;
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}
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} else {
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break;
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default:
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handled = false;
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}
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