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#include "gmdocument.h"
#include "ui/color.h"
#include "ui/text.h"
#include "ui/metrics.h"
#include <the_Foundation/array.h>
struct Impl_GmDocument {
iObject object;
iString source;
iInt2 size;
iArray layout; /* contents of source, laid out in document space */
};
iDefineObjectConstruction(GmDocument)
enum iGmLineType {
text_GmLineType,
bullet_GmLineType,
preformatted_GmLineType,
quote_GmLineType,
header1_GmLineType,
header2_GmLineType,
header3_GmLineType,
max_GmLineType,
};
static enum iGmLineType lineType_Rangecc_(const iRangecc *line) {
if (isEmpty_Range(line)) {
return text_GmLineType;
}
if (startsWithSc_Rangecc(line, "###", &iCaseSensitive)) {
return header3_GmLineType;
}
if (startsWithSc_Rangecc(line, "##", &iCaseSensitive)) {
return header2_GmLineType;
}
if (startsWithSc_Rangecc(line, "#", &iCaseSensitive)) {
return header1_GmLineType;
}
if (startsWithSc_Rangecc(line, "```", &iCaseSensitive)) {
return preformatted_GmLineType;
}
if (*line->start == '>') {
return quote_GmLineType;
}
if (size_Range(line) >= 2 && line->start[0] == '*' && isspace(line->start[1])) {
return bullet_GmLineType;
}
return text_GmLineType;
}
static void trimLine_Rangecc_(iRangecc *line, enum iGmLineType type) {
static const unsigned int skip[max_GmLineType] = { 0, 2, 3, 1, 1, 2, 3 };
line->start += skip[type];
trim_Rangecc(line);
}
static int lastVisibleRunBottom_GmDocument_(const iGmDocument *d) {
iReverseConstForEach(Array, i, &d->layout) {
const iGmRun *run = i.value;
if (isEmpty_Range(&run->text)) {
continue;
}
return bottom_Rect(run->bounds);
}
return 0;
}
static void doLayout_GmDocument_(iGmDocument *d) {
if (d->size.x <= 0 || isEmpty_String(&d->source)) {
return;
}
clear_Array(&d->layout);
iBool isPreformat = iFalse;
iInt2 pos = zero_I2();
const iRangecc content = range_String(&d->source);
iRangecc line = iNullRange;
static const int fonts[max_GmLineType] = {
paragraph_FontId,
paragraph_FontId, /* bullet */
preformatted_FontId,
quote_FontId,
header1_FontId,
header2_FontId,
header3_FontId
};
static const int indents[max_GmLineType] = {
4, 10, 4, 10, 0, 0, 0
};
static const float topMargin[max_GmLineType] = {
0.0f, 0.5f, 1.0f, 0.5f, 2.0f, 1.5f, 1.0f
};
static const float bottomMargin[max_GmLineType] = {
0.0f, 0.5f, 1.0f, 0.5f, 1.0f, 1.0f, 1.0f
};
static const char *bullet = "\u2022";
iRangecc preAltText = iNullRange;
enum iGmLineType prevType = text_GmLineType;
while (nextSplit_Rangecc(&content, "\n", &line)) {
iGmRun run;
run.color = white_ColorId;
run.linkId = 0;
enum iGmLineType type;
int indent = 0;
if (!isPreformat) {
type = lineType_Rangecc_(&line);
indent = indents[type];
if (type == preformatted_GmLineType) {
isPreformat = iTrue;
trimLine_Rangecc_(&line, type);
preAltText = line;
/* TODO: store and link the alt text to this run */
continue;
}
trimLine_Rangecc_(&line, type);
run.font = fonts[type];
}
else {
type = preformatted_GmLineType;
if (startsWithSc_Rangecc(&line, "```", &iCaseSensitive)) {
isPreformat = iFalse;
preAltText = iNullRange;
continue;
}
run.font = preformatted_FontId;
indent = indents[type];
}
/* Check the margin. */
if (isEmpty_Range(&line)) {
pos.y += lineHeight_Text(run.font);
prevType = text_GmLineType;
continue;
}
if (!isPreformat || (prevType != preformatted_GmLineType)) {
int required =
iMax(topMargin[type], bottomMargin[prevType]) * lineHeight_Text(paragraph_FontId);
if (isEmpty_Array(&d->layout)) {
required = 0; /* top of document */
}
int delta = pos.y - lastVisibleRunBottom_GmDocument_(d);
if (delta < required) {
pos.y += required - delta;
}
}
if (type == bullet_GmLineType) {
run.bounds.pos = addX_I2(pos, indent * gap_UI);
run.bounds.size = advance_Text(run.font, bullet);
run.bounds.pos.x -= 4 * gap_UI - run.bounds.size.x / 2;
run.text = (iRangecc){ bullet, bullet + strlen(bullet) };
pushBack_Array(&d->layout, &run);
}
run.text = line;
run.bounds.pos = addX_I2(pos, indent * gap_UI);
run.bounds.size = advanceRange_Text(run.font, line);
pushBack_Array(&d->layout, &run);
pos.y += run.bounds.size.y;
prevType = type;
}
d->size.y = pos.y;
}
void init_GmDocument(iGmDocument *d) {
init_String(&d->source);
d->size = zero_I2();
init_Array(&d->layout, sizeof(iGmRun));
}
void deinit_GmDocument(iGmDocument *d) {
deinit_Array(&d->layout);
deinit_String(&d->source);
}
void setWidth_GmDocument(iGmDocument *d, int width) {
d->size.x = width;
doLayout_GmDocument_(d); /* TODO: just flag need-layout and do it later */
}
iLocalDef iBool isNormalizableSpace_(char ch) {
return ch == ' ' || ch == '\t';
}
static void normalize_GmDocument(iGmDocument *d) {
iString *normalized = new_String();
iRangecc src = range_String(&d->source);
iRangecc line = iNullRange;
iBool isPreformat = iFalse;
while (nextSplit_Rangecc(&src, "\n", &line)) {
if (isPreformat) {
appendRange_String(normalized, line);
appendCStr_String(normalized, "\n");
if (lineType_Rangecc_(&line) == preformatted_GmLineType) {
isPreformat = iFalse;
}
continue;
}
if (lineType_Rangecc_(&line) == preformatted_GmLineType) {
isPreformat = iTrue;
appendRange_String(normalized, line);
appendCStr_String(normalized, "\n");
continue;
}
iBool isPrevSpace = iFalse;
for (const char *ch = line.start; ch != line.end; ch++) {
if (isNormalizableSpace_(*ch)) {
if (isPrevSpace) {
continue;
}
isPrevSpace = iTrue;
}
else {
isPrevSpace = iFalse;
}
appendCStrN_String(normalized, ch, 1);
}
appendCStr_String(normalized, "\n");
}
set_String(&d->source, collect_String(normalized));
printf("normalized:\n%s\n", cstr_String(&d->source));
}
void setSource_GmDocument(iGmDocument *d, const iString *source, int width) {
set_String(&d->source, source);
normalize_GmDocument(d);
setWidth_GmDocument(d, width);
/* TODO: just flag need-layout and do it later */
}
void render_GmDocument(const iGmDocument *d, iRangei visRangeY, iGmDocumentRenderFunc render,
void *context) {
iBool isInside = iFalse;
iConstForEach(Array, i, &d->layout) {
const iGmRun *run = i.value;
if (isInside) {
if (top_Rect(run->bounds) > visRangeY.end) {
break;
}
render(context, run);
}
else if (bottom_Rect(run->bounds) >= visRangeY.start) {
isInside = iTrue;
render(context, run);
}
}
}
iDefineClass(GmDocument)
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