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/*
See license.txt in the root of this project.
*/
# include "luametatex.h"
halfword tex_aux_scan_rule_spec(rule_types t, halfword s)
{
/*tex |width|, |depth|, and |height| all equal |null_flag| now */
halfword rule = tex_new_rule_node((quarterword) s);
halfword attr = node_attr(rule);
switch (t) {
case h_rule_type:
rule_height(rule) = default_rule;
rule_depth(rule) = 0;
break;
case v_rule_type:
case m_rule_type:
if (s == strut_rule_code) {
rule_width(rule) = 0;
node_subtype(rule) = strut_rule_subtype;
rule_height(rule) = null_flag;
rule_depth(rule) = null_flag;
} else {
rule_width(rule) = default_rule;
}
break;
}
while (1) {
/*tex
Maybe:
h : "whdxylrWHDXYLR"
v : "whdxytbWHDXYTB"
m : "whdxylrtbWHDXYLRTB"
but for now we are tolerant because internally it's left/right anyway.
*/
switch (tex_scan_character("awhdxylrtbcfAWHDXYLRTBCF", 0, 1, 0)) {
case 0:
goto DONE;
case 'a': case 'A':
if (tex_scan_mandate_keyword("attr", 1)) {
halfword i = tex_scan_attribute_register_number();
halfword v = tex_scan_int(1, NULL);
if (eq_value(register_attribute_location(i)) != v) {
if (attr) {
attr = tex_patch_attribute_list(attr, i, v);
} else {
attr = tex_copy_attribute_list_set(tex_current_attribute_list(), i, v);
}
}
}
break;
case 'w': case 'W':
if (tex_scan_mandate_keyword("width", 1)) {
rule_width(rule) = tex_scan_dimen(0, 0, 0, 0, NULL);
}
break;
case 'h': case 'H':
if (tex_scan_mandate_keyword("height", 1)) {
rule_height(rule) = tex_scan_dimen(0, 0, 0, 0, NULL);
}
break;
case 'd': case 'D':
if (tex_scan_mandate_keyword("depth", 1)) {
rule_depth(rule) = tex_scan_dimen(0, 0, 0, 0, NULL);
}
break;
case 'l': case 'L':
if (tex_scan_mandate_keyword("left", 1)) {
rule_left(rule) = tex_scan_dimen(0, 0, 0, 0, NULL);
}
break;
case 'r': case 'R':
if (tex_scan_mandate_keyword("right", 1)) {
rule_right(rule) = tex_scan_dimen(0, 0, 0, 0, NULL);
}
break;
case 't': case 'T': /* just because it's nicer */
if (tex_scan_mandate_keyword("top", 1)) {
rule_left(rule) = tex_scan_dimen(0, 0, 0, 0, NULL);
}
break;
case 'b': case 'B': /* just because it's nicer */
if (tex_scan_mandate_keyword("bottom", 1)) {
rule_right(rule) = tex_scan_dimen(0, 0, 0, 0, NULL);
}
break;
case 'x': case 'X':
if (tex_scan_mandate_keyword("xoffset", 1)) {
rule_x_offset(rule) = tex_scan_dimen(0, 0, 0, 0, NULL);
}
break;
case 'y': case 'Y':
if (tex_scan_mandate_keyword("yoffset", 1)) {
rule_y_offset(rule) = tex_scan_dimen(0, 0, 0, 0, NULL);
}
break;
case 'f': case 'F':
switch (tex_scan_character("aoAO", 0, 0, 0)) {
case 'o': case 'O':
if (tex_scan_mandate_keyword("font", 2)) {
tex_set_rule_font(rule, tex_scan_font_identifier(NULL));
}
break;
case 'a': case 'A':
if (tex_scan_mandate_keyword("fam", 2)) {
tex_set_rule_family(rule, tex_scan_math_family_number());
}
break;
default:
tex_aux_show_keyword_error("font|fam");
goto DONE;
}
break;
case 'c': case 'C':
if (tex_scan_mandate_keyword("char", 1)) {
rule_character(rule) = tex_scan_char_number(0);
}
break;
default:
goto DONE;
}
}
DONE:
node_attr(rule) = attr;
if (t == v_rule_type && s == strut_rule_code) {
tex_aux_check_text_strut_rule(rule, text_style);
}
return rule;
}
void tex_aux_run_vrule(void)
{
tex_tail_append(tex_aux_scan_rule_spec(v_rule_type, cur_chr));
cur_list.space_factor = 1000;
}
void tex_aux_run_hrule(void)
{
tex_tail_append(tex_aux_scan_rule_spec(h_rule_type, cur_chr));
cur_list.prev_depth = ignore_depth_criterium_par;
}
void tex_aux_run_mrule(void)
{
tex_tail_append(tex_aux_scan_rule_spec(m_rule_type, cur_chr));
}
void tex_aux_check_math_strut_rule(halfword rule, halfword style)
{
if (node_subtype(rule) == strut_rule_subtype) {
scaled ht = rule_height(rule);
scaled dp = rule_depth(rule);
if (ht == null_flag || dp == null_flag) {
halfword fnt = tex_get_rule_font(rule, style);
halfword chr = rule_character(rule);
if (fnt > 0 && chr && tex_char_exists(fnt, chr)) {
if (ht == null_flag) {
ht = tex_math_font_char_ht(fnt, chr, style);
}
if (dp == null_flag) {
dp = tex_math_font_char_dp(fnt, chr, style);
}
} else {
if (ht == null_flag) {
ht = tex_get_math_y_parameter(style, math_parameter_rule_height);
}
if (dp == null_flag) {
dp = tex_get_math_y_parameter(style, math_parameter_rule_depth);
}
}
rule_height(rule) = ht;
rule_depth(rule) = dp;
}
}
}
void tex_aux_check_text_strut_rule(halfword rule, halfword style)
{
if (node_subtype(rule) == strut_rule_subtype) {
scaled ht = rule_height(rule);
scaled dp = rule_depth(rule);
if (ht == null_flag || dp == null_flag) {
halfword fnt = tex_get_rule_font(rule, style);
halfword chr = rule_character(rule);
if (fnt > 0 && chr && tex_char_exists(fnt, chr)) {
scaledwhd whd = tex_char_whd_from_font(fnt, chr);
if (ht == null_flag) {
rule_height(rule) = whd.ht;
}
if (dp == null_flag) {
rule_depth(rule) = whd.dp;
}
}
}
}
}
halfword tex_get_rule_font(halfword n, halfword style)
{
halfword fnt = rule_font(n);
if (fnt >= rule_font_fam_offset) {
halfword fam = fnt - rule_font_fam_offset;
if (fam_par_in_range(fam)) {
fnt = tex_fam_fnt(fam, tex_size_of_style(style));
}
}
if (fnt < 0 || fnt >= max_n_of_fonts) {
return null_font;
} else {
return fnt;
}
}
halfword tex_get_rule_family(halfword n)
{
halfword fnt = rule_font(n);
if (fnt >= rule_font_fam_offset) {
halfword fam = fnt - rule_font_fam_offset;
if (fam_par_in_range(fam)) {
return fam;
}
}
return 0;
}
void tex_set_rule_font(halfword n, halfword fnt)
{
if (fnt < 0 || fnt >= rule_font_fam_offset) {
rule_font(n) = 0;
} else {
rule_font(n) = fnt;
}
}
void tex_set_rule_family(halfword n, halfword fam)
{
if (fam < 0 || fam >= max_n_of_math_families) {
rule_font(n) = rule_font_fam_offset;
} else {
rule_font(n) = rule_font_fam_offset + fam;
}
}
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