lorid

commit fbfb37c5440ea4d836d3742f89a32919d8e43349
parent 78d4be4302a623b81db0ccb4f09831964dc2a690
Author: nibo <nibo@relim.de>
Date:   Thu, 20 Feb 2025 20:20:59 +0100

Continue implementing metadata substitution

Diffstat:
M
src/chordpro.c
 | 
139
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-----
M
src/chordpro.h
 | 
8
++++++++

2 files changed, 139 insertions(+), 8 deletions(-)
diff --git a/src/chordpro.c b/src/chordpro.c
@@ -1772,14 +1772,133 @@ cho_metadata_load_default(struct ChoContext *ctx)
 	return meta;
 }
 
-/* static char *
+static char *
 cho_metadata_substitution_parse(
+	struct ChoContext *ctx,
 	const char *str,
 	struct ChoMetadata **metadata,
 	enum State state_before_substitution
 )
 {
-} */
+	enum MetadataSubstitutionState state = MSS_NAME;
+	enum AttrValueSyntax avs = -1;
+	char name[128];
+	name[0] = 0;
+	char value[4096];
+	value[0] = 0;
+	char prev_c = 0;
+	char c = 0;
+	int n = 0;
+	for (; *str; str++) {
+		c = *str;
+		switch (state) {
+		case MSS_NAME: {
+			if (c == '=') {
+				name[n] = 0;
+				n = 0;
+				state = MSS_VALUE;
+				break;
+			}
+			if (prev_c != '\\' && c == '|') {
+				name[n] = 0;
+				n = 0;
+				state = MSS_TRUE_TEXT;
+				break;
+			}
+			name[n] = c;
+			n++;
+			break;
+		}
+		case MSS_VALUE: {
+			if (avs == -1) {
+				if (is_whitespace(c)) {
+					cho_log(ctx, LOG_ERR, "Whitespace character after equals sign is invalid.");
+					return NULL;
+				}
+				if (c == '|') {
+					cho_log(ctx, LOG_ERR, "If you specify an equals sign then you have to provide a value.");
+					return NULL;
+				}
+				if (c == '\'') {
+					avs = AVS_APOSTROPHE;
+				} else if (c == '"') {
+					avs = AVS_QUOTATION_MARK;
+				} else {
+					avs = AVS_UNQUOTED;
+					value[n] = c;
+					n++;
+				}
+				break;
+			}
+			if (prev_c != '\\' && c == '|') {
+				if (avs == AVS_APOSTROPHE) {
+					cho_log(ctx, LOG_ERR, "Can't find a matching '\''.");
+					return NULL;
+				}
+				if (avs == AVS_QUOTATION_MARK) {
+					cho_log(ctx, LOG_ERR, "Can't find a matching '\"'.");
+					return NULL;
+				}
+				if (avs == AVS_UNQUOTED) {
+					value[n] = 0;
+					n = 0;
+					state = MSS_TRUE_TEXT;
+					break;
+				}
+				if (avs == -1) {
+					state = MSS_TRUE_TEXT;
+					break;
+				}
+				break;
+			}
+			if (
+				(avs == AVS_APOSTROPHE && c == '\'') ||
+				(avs == AVS_QUOTATION_MARK && c == '"') ||
+				(avs == AVS_UNQUOTED && c == ' ')
+			) {
+				value[n] = 0;
+				n = 0;
+				state = MSS_WAIT_FOR_PIPE;
+				break;
+			}
+			value[n] = c;
+			n++;
+			break;
+		}
+		case MSS_TRUE_TEXT: {
+			if (prev_c != '\\' && c == '|') {
+				state = MSS_FALSE_TEXT;
+				break;
+			}
+			break;
+		}
+		case MSS_FALSE_TEXT: {
+			break;
+		}
+		case MSS_WAIT_FOR_PIPE: {
+			if (is_whitespace(c)) {
+				break;
+			}
+			if (c == '|') {
+				state = MSS_TRUE_TEXT;
+				break;
+			}
+			break;
+		}
+		}
+		prev_c = c;
+	}
+	if (state == MSS_NAME) {
+		name[n] = 0;
+	} else if (state == MSS_VALUE && avs == AVS_UNQUOTED) {
+		value[n] = 0;
+	}
+	if (name[0] != 0)
+		printf("name '%s'\n", name);
+	if (value[0] != 0)
+		printf("value '%s'\n", value);
+	return "";
+}
 
 static bool
 transposition_parse(const char *str, int *transpose)
@@ -5509,16 +5628,20 @@ cho_songs_parse(const char *str, const char *chordpro_filepath, struct Config *c
 			break;
 		}
 		case STATE_METADATA_SUBSTITUTION: {
-			if (c == '}') {
+			if (prev_c != '\\' && c == '}') {
 				if (ctx.nested_level == 0) {
 					metadata_substitution[ctx.ms] = 0;
 					ctx.ms = 0;
-					printf("substitution: '%s'\n", metadata_substitution);
-					/* char *substituted = cho_metadata_substitution_parse(
+					char *substituted = cho_metadata_substitution_parse(
+						&ctx,
 						metadata_substitution,
-						songs[so]->metadata,
-						state_before_metadata_substitution
-					); */
+						ctx.songs[ctx.so]->metadata,
+						ctx.state_before_metadata_substitution
+					);
+					if (!substituted) {
+						LOG_DEBUG("cho_metadata_substitution_parse failed.");
+						return NULL;
+					}
 					// Append 'substituted' to whatever text
 					ctx.state = ctx.state_before_metadata_substitution;
 					break;
diff --git a/src/chordpro.h b/src/chordpro.h
@@ -30,6 +30,14 @@ enum ChordDiagramState {
 	CDS_COPY
 };
 
+enum MetadataSubstitutionState {
+	MSS_NAME,
+	MSS_VALUE,
+	MSS_TRUE_TEXT,
+	MSS_FALSE_TEXT,
+	MSS_WAIT_FOR_PIPE
+};
+
 enum ChordDirective {
 	TRANSPOSE, DEFINE /* , CHORD */
 };