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-rw-r--r--doc/context/documents/general/qrcs/setup-cs.pdfbin845153 -> 845467 bytes
-rw-r--r--doc/context/documents/general/qrcs/setup-de.pdfbin843045 -> 843087 bytes
-rw-r--r--doc/context/documents/general/qrcs/setup-en.pdfbin848083 -> 848226 bytes
-rw-r--r--doc/context/documents/general/qrcs/setup-fr.pdfbin841724 -> 841945 bytes
-rw-r--r--doc/context/documents/general/qrcs/setup-it.pdfbin843463 -> 843541 bytes
-rw-r--r--doc/context/documents/general/qrcs/setup-nl.pdfbin840158 -> 840328 bytes
-rw-r--r--doc/context/documents/general/qrcs/setup-ro.pdfbin840226 -> 840752 bytes
-rw-r--r--doc/context/sources/general/fonts/fonts/fonts-extensions.tex194
8 files changed, 193 insertions, 1 deletions
diff --git a/doc/context/documents/general/qrcs/setup-cs.pdf b/doc/context/documents/general/qrcs/setup-cs.pdf
index 37c7a68fb..a0053d6f5 100644
--- a/doc/context/documents/general/qrcs/setup-cs.pdf
+++ b/doc/context/documents/general/qrcs/setup-cs.pdf
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diff --git a/doc/context/documents/general/qrcs/setup-de.pdf b/doc/context/documents/general/qrcs/setup-de.pdf
index 5da0c198c..03475267e 100644
--- a/doc/context/documents/general/qrcs/setup-de.pdf
+++ b/doc/context/documents/general/qrcs/setup-de.pdf
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diff --git a/doc/context/documents/general/qrcs/setup-en.pdf b/doc/context/documents/general/qrcs/setup-en.pdf
index 909024974..d1f8f2779 100644
--- a/doc/context/documents/general/qrcs/setup-en.pdf
+++ b/doc/context/documents/general/qrcs/setup-en.pdf
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diff --git a/doc/context/documents/general/qrcs/setup-fr.pdf b/doc/context/documents/general/qrcs/setup-fr.pdf
index dad17cbcf..af01a90e6 100644
--- a/doc/context/documents/general/qrcs/setup-fr.pdf
+++ b/doc/context/documents/general/qrcs/setup-fr.pdf
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diff --git a/doc/context/documents/general/qrcs/setup-it.pdf b/doc/context/documents/general/qrcs/setup-it.pdf
index 82212f1ca..f1c34d492 100644
--- a/doc/context/documents/general/qrcs/setup-it.pdf
+++ b/doc/context/documents/general/qrcs/setup-it.pdf
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diff --git a/doc/context/documents/general/qrcs/setup-nl.pdf b/doc/context/documents/general/qrcs/setup-nl.pdf
index 7b65a0afb..c85de095b 100644
--- a/doc/context/documents/general/qrcs/setup-nl.pdf
+++ b/doc/context/documents/general/qrcs/setup-nl.pdf
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diff --git a/doc/context/documents/general/qrcs/setup-ro.pdf b/doc/context/documents/general/qrcs/setup-ro.pdf
index 55a3ade53..1492351bd 100644
--- a/doc/context/documents/general/qrcs/setup-ro.pdf
+++ b/doc/context/documents/general/qrcs/setup-ro.pdf
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diff --git a/doc/context/sources/general/fonts/fonts/fonts-extensions.tex b/doc/context/sources/general/fonts/fonts/fonts-extensions.tex
index 87e362569..1d84bfdc6 100644
--- a/doc/context/sources/general/fonts/fonts/fonts-extensions.tex
+++ b/doc/context/sources/general/fonts/fonts/fonts-extensions.tex
@@ -1714,6 +1714,199 @@ Here the dataset is a sequence of rules. There can be a \type {before}, \type
{lookups} entry and the numbers are indices in the provided \type {lookups}
table.
+Here is another example. This one demonstrates that one can check against spaces
+(some fonts kerns against them) and against boundaries as well. The later is
+something \CONTEXT\ specific. First we define a feature that create ligatures but
+only when we touch a space:
+
+\startbuffer
+\startluacode
+ fonts.handlers.otf.addfeature {
+ name = "test-a",
+ type = "chainsubstitution",
+ lookups = {
+ {
+ type = "ligature",
+ data = {
+ ['1'] = { "a", "b" },
+ ['2'] = { "c", "d" },
+ },
+ },
+ },
+ data = {
+ rules = {
+ {
+ before = { { " " } },
+ current = { { "a" }, { "b" } },
+ lookups = { 1 },
+ },
+ {
+ current = { { "c" }, { "d" } },
+ after = { { " " } },
+ lookups = { 1 },
+ },
+ },
+ },
+ }
+
+\stopluacode
+\stopbuffer
+
+\typebuffer \getbuffer
+
+The next example also checks against whatever boundary we have.
+
+\startbuffer
+\startluacode
+ fonts.handlers.otf.addfeature {
+ name = "test-b",
+ type = "chainsubstitution",
+ lookups = {
+ {
+ type = "ligature",
+ data = {
+ ['1'] = { "a", "b" },
+ ['2'] = { "c", "d" },
+ },
+ },
+ },
+ data = {
+ rules = {
+ {
+ before = { { " ", 0xFFFC } },
+ current = { { "a" }, { "b" } },
+ lookups = { 1 },
+ },
+ {
+ current = { { "c" }, { "d" } },
+ after = { { 0xFFFC, " " } },
+ lookups = { 1 },
+ },
+ },
+ },
+ }
+\stopluacode
+\stopbuffer
+
+\typebuffer \getbuffer
+
+We can actually simplify this one to:
+
+\startbuffer
+\startluacode
+ fonts.handlers.otf.addfeature {
+ name = "test-c",
+ type = "chainsubstitution",
+ lookups = {
+ {
+ type = "ligature",
+ data = {
+ ['1'] = { "a", "b" },
+ ['2'] = { "c", "d" },
+ },
+ },
+ },
+ data = {
+ rules = {
+ {
+ before = { { 0xFFFC } },
+ current = { { "a" }, { "b" } },
+ lookups = { 1 },
+ },
+ {
+ current = { { "c" }, { "d" } },
+ after = { { 0xFFFC } },
+ lookups = { 1 },
+ },
+ },
+ },
+ }
+\stopluacode
+\stopbuffer
+
+\typebuffer \getbuffer
+
+As a bonus we show how to do more complex things:
+
+\startbuffer
+\startluacode
+ fonts.handlers.otf.addfeature {
+ name = "test-d",
+ type = "chainsubstitution",
+ lookups = {
+ {
+ type = "substitution",
+ data = {
+ ["a"] = "A",
+ ["b"] = "B",
+ ["c"] = "C",
+ ["d"] = "D",
+ },
+ },
+ {
+ type = "ligature",
+ data = {
+ ['1'] = { "a", "b" },
+ ['2'] = { "c", "d" },
+ },
+ },
+ },
+ data = {
+ rules = {
+ {
+ before = { { 0xFFFC } },
+ current = { { "a" }, { "b" } },
+ lookups = { 2 },
+ },
+ {
+ current = { { "c" }, { "d" } },
+ after = { { 0xFFFC } },
+ lookups = { 2 },
+ },
+ {
+ current = { { "a" } },
+ after = { { "b" } },
+ lookups = { 1 },
+ },
+ {
+ current = { { "c" } },
+ after = { { "d" } },
+ lookups = { 1 },
+ },
+ },
+ },
+ }
+\stopluacode
+\stopbuffer
+
+\typebuffer \getbuffer
+
+\definefontfeature[test-a][test-a=yes]
+\definefontfeature[test-b][test-b=yes]
+\definefontfeature[test-c][test-c=yes]
+\definefontfeature[test-d][test-d=yes]
+
+\startbuffer
+abababcdcd abababcdcd abababcdcd
+\stopbuffer
+
+With the test text:
+
+\typebuffer
+
+These four result in:
+
+\blank \start
+
+ \definedfont[file:dejavu-serif.ttf*default]
+
+ \start \addff{test-a} \getbuffer \stop\par
+ \start \addff{test-b} \getbuffer \stop\par
+ \start \addff{test-c} \getbuffer \stop\par
+ \start \addff{test-d} \getbuffer \stop\par
+
+\stop \blank
+
\stopsubsection
\startsubsection[title={Language dependencies}]
@@ -2075,7 +2268,6 @@ fonts.handlers.otf.addfeature {
{ "down", depth + height },
{ "rule", 3*height, width/5 },
-
}
}